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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Procedures for interfacing to Open Firmware.
4 *
5 * Paul Mackerras August 1996.
6 * Copyright (C) 1996-2005 Paul Mackerras.
7 *
8 * Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
9 * {engebret|bergner}@us.ibm.com
10 */
11
12#undef DEBUG_PROM
13
14/* we cannot use FORTIFY as it brings in new symbols */
15#define __NO_FORTIFY
16
17#include <stdarg.h>
18#include <linux/kernel.h>
19#include <linux/string.h>
20#include <linux/init.h>
21#include <linux/threads.h>
22#include <linux/spinlock.h>
23#include <linux/types.h>
24#include <linux/pci.h>
25#include <linux/proc_fs.h>
26#include <linux/delay.h>
27#include <linux/initrd.h>
28#include <linux/bitops.h>
29#include <linux/pgtable.h>
30#include <linux/printk.h>
31#include <asm/prom.h>
32#include <asm/rtas.h>
33#include <asm/page.h>
34#include <asm/processor.h>
35#include <asm/interrupt.h>
36#include <asm/irq.h>
37#include <asm/io.h>
38#include <asm/smp.h>
39#include <asm/mmu.h>
40#include <asm/iommu.h>
41#include <asm/btext.h>
42#include <asm/sections.h>
43#include <asm/machdep.h>
44#include <asm/asm-prototypes.h>
45#include <asm/ultravisor-api.h>
46
47#include <linux/linux_logo.h>
48
49/* All of prom_init bss lives here */
50#define __prombss __section(".bss.prominit")
51
52/*
53 * Eventually bump that one up
54 */
55#define DEVTREE_CHUNK_SIZE 0x100000
56
57/*
58 * This is the size of the local memory reserve map that gets copied
59 * into the boot params passed to the kernel. That size is totally
60 * flexible as the kernel just reads the list until it encounters an
61 * entry with size 0, so it can be changed without breaking binary
62 * compatibility
63 */
64#define MEM_RESERVE_MAP_SIZE 8
65
66/*
67 * prom_init() is called very early on, before the kernel text
68 * and data have been mapped to KERNELBASE. At this point the code
69 * is running at whatever address it has been loaded at.
70 * On ppc32 we compile with -mrelocatable, which means that references
71 * to extern and static variables get relocated automatically.
72 * ppc64 objects are always relocatable, we just need to relocate the
73 * TOC.
74 *
75 * Because OF may have mapped I/O devices into the area starting at
76 * KERNELBASE, particularly on CHRP machines, we can't safely call
77 * OF once the kernel has been mapped to KERNELBASE. Therefore all
78 * OF calls must be done within prom_init().
79 *
80 * ADDR is used in calls to call_prom. The 4th and following
81 * arguments to call_prom should be 32-bit values.
82 * On ppc64, 64 bit values are truncated to 32 bits (and
83 * fortunately don't get interpreted as two arguments).
84 */
85#define ADDR(x) (u32)(unsigned long)(x)
86
87#ifdef CONFIG_PPC64
88#define OF_WORKAROUNDS 0
89#else
90#define OF_WORKAROUNDS of_workarounds
91static int of_workarounds __prombss;
92#endif
93
94#define OF_WA_CLAIM 1 /* do phys/virt claim separately, then map */
95#define OF_WA_LONGTRAIL 2 /* work around longtrail bugs */
96
97#define PROM_BUG() do { \
98 prom_printf("kernel BUG at %s line 0x%x!\n", \
99 __FILE__, __LINE__); \
100 __builtin_trap(); \
101} while (0)
102
103#ifdef DEBUG_PROM
104#define prom_debug(x...) prom_printf(x)
105#else
106#define prom_debug(x...) do { } while (0)
107#endif
108
109
110typedef u32 prom_arg_t;
111
112struct prom_args {
113 __be32 service;
114 __be32 nargs;
115 __be32 nret;
116 __be32 args[10];
117};
118
119struct prom_t {
120 ihandle root;
121 phandle chosen;
122 int cpu;
123 ihandle stdout;
124 ihandle mmumap;
125 ihandle memory;
126};
127
128struct mem_map_entry {
129 __be64 base;
130 __be64 size;
131};
132
133typedef __be32 cell_t;
134
135extern void __start(unsigned long r3, unsigned long r4, unsigned long r5,
136 unsigned long r6, unsigned long r7, unsigned long r8,
137 unsigned long r9);
138
139#ifdef CONFIG_PPC64
140extern int enter_prom(struct prom_args *args, unsigned long entry);
141#else
142static inline int enter_prom(struct prom_args *args, unsigned long entry)
143{
144 return ((int (*)(struct prom_args *))entry)(args);
145}
146#endif
147
148extern void copy_and_flush(unsigned long dest, unsigned long src,
149 unsigned long size, unsigned long offset);
150
151/* prom structure */
152static struct prom_t __prombss prom;
153
154static unsigned long __prombss prom_entry;
155
156static char __prombss of_stdout_device[256];
157static char __prombss prom_scratch[256];
158
159static unsigned long __prombss dt_header_start;
160static unsigned long __prombss dt_struct_start, dt_struct_end;
161static unsigned long __prombss dt_string_start, dt_string_end;
162
163static unsigned long __prombss prom_initrd_start, prom_initrd_end;
164
165#ifdef CONFIG_PPC64
166static int __prombss prom_iommu_force_on;
167static int __prombss prom_iommu_off;
168static unsigned long __prombss prom_tce_alloc_start;
169static unsigned long __prombss prom_tce_alloc_end;
170#endif
171
172#ifdef CONFIG_PPC_PSERIES
173static bool __prombss prom_radix_disable;
174static bool __prombss prom_radix_gtse_disable;
175static bool __prombss prom_xive_disable;
176#endif
177
178#ifdef CONFIG_PPC_SVM
179static bool __prombss prom_svm_enable;
180#endif
181
182struct platform_support {
183 bool hash_mmu;
184 bool radix_mmu;
185 bool radix_gtse;
186 bool xive;
187};
188
189/* Platforms codes are now obsolete in the kernel. Now only used within this
190 * file and ultimately gone too. Feel free to change them if you need, they
191 * are not shared with anything outside of this file anymore
192 */
193#define PLATFORM_PSERIES 0x0100
194#define PLATFORM_PSERIES_LPAR 0x0101
195#define PLATFORM_LPAR 0x0001
196#define PLATFORM_POWERMAC 0x0400
197#define PLATFORM_GENERIC 0x0500
198
199static int __prombss of_platform;
200
201static char __prombss prom_cmd_line[COMMAND_LINE_SIZE];
202
203static unsigned long __prombss prom_memory_limit;
204
205static unsigned long __prombss alloc_top;
206static unsigned long __prombss alloc_top_high;
207static unsigned long __prombss alloc_bottom;
208static unsigned long __prombss rmo_top;
209static unsigned long __prombss ram_top;
210
211static struct mem_map_entry __prombss mem_reserve_map[MEM_RESERVE_MAP_SIZE];
212static int __prombss mem_reserve_cnt;
213
214static cell_t __prombss regbuf[1024];
215
216static bool __prombss rtas_has_query_cpu_stopped;
217
218
219/*
220 * Error results ... some OF calls will return "-1" on error, some
221 * will return 0, some will return either. To simplify, here are
222 * macros to use with any ihandle or phandle return value to check if
223 * it is valid
224 */
225
226#define PROM_ERROR (-1u)
227#define PHANDLE_VALID(p) ((p) != 0 && (p) != PROM_ERROR)
228#define IHANDLE_VALID(i) ((i) != 0 && (i) != PROM_ERROR)
229
230/* Copied from lib/string.c and lib/kstrtox.c */
231
232static int __init prom_strcmp(const char *cs, const char *ct)
233{
234 unsigned char c1, c2;
235
236 while (1) {
237 c1 = *cs++;
238 c2 = *ct++;
239 if (c1 != c2)
240 return c1 < c2 ? -1 : 1;
241 if (!c1)
242 break;
243 }
244 return 0;
245}
246
247static ssize_t __init prom_strscpy_pad(char *dest, const char *src, size_t n)
248{
249 ssize_t rc;
250 size_t i;
251
252 if (n == 0 || n > INT_MAX)
253 return -E2BIG;
254
255 // Copy up to n bytes
256 for (i = 0; i < n && src[i] != '\0'; i++)
257 dest[i] = src[i];
258
259 rc = i;
260
261 // If we copied all n then we have run out of space for the nul
262 if (rc == n) {
263 // Rewind by one character to ensure nul termination
264 i--;
265 rc = -E2BIG;
266 }
267
268 for (; i < n; i++)
269 dest[i] = '\0';
270
271 return rc;
272}
273
274static int __init prom_strncmp(const char *cs, const char *ct, size_t count)
275{
276 unsigned char c1, c2;
277
278 while (count) {
279 c1 = *cs++;
280 c2 = *ct++;
281 if (c1 != c2)
282 return c1 < c2 ? -1 : 1;
283 if (!c1)
284 break;
285 count--;
286 }
287 return 0;
288}
289
290static size_t __init prom_strlen(const char *s)
291{
292 const char *sc;
293
294 for (sc = s; *sc != '\0'; ++sc)
295 /* nothing */;
296 return sc - s;
297}
298
299static int __init prom_memcmp(const void *cs, const void *ct, size_t count)
300{
301 const unsigned char *su1, *su2;
302 int res = 0;
303
304 for (su1 = cs, su2 = ct; 0 < count; ++su1, ++su2, count--)
305 if ((res = *su1 - *su2) != 0)
306 break;
307 return res;
308}
309
310static char __init *prom_strstr(const char *s1, const char *s2)
311{
312 size_t l1, l2;
313
314 l2 = prom_strlen(s2);
315 if (!l2)
316 return (char *)s1;
317 l1 = prom_strlen(s1);
318 while (l1 >= l2) {
319 l1--;
320 if (!prom_memcmp(s1, s2, l2))
321 return (char *)s1;
322 s1++;
323 }
324 return NULL;
325}
326
327static size_t __init prom_strlcat(char *dest, const char *src, size_t count)
328{
329 size_t dsize = prom_strlen(dest);
330 size_t len = prom_strlen(src);
331 size_t res = dsize + len;
332
333 /* This would be a bug */
334 if (dsize >= count)
335 return count;
336
337 dest += dsize;
338 count -= dsize;
339 if (len >= count)
340 len = count-1;
341 memcpy(dest, src, len);
342 dest[len] = 0;
343 return res;
344
345}
346
347#ifdef CONFIG_PPC_PSERIES
348static int __init prom_strtobool(const char *s, bool *res)
349{
350 if (!s)
351 return -EINVAL;
352
353 switch (s[0]) {
354 case 'y':
355 case 'Y':
356 case '1':
357 *res = true;
358 return 0;
359 case 'n':
360 case 'N':
361 case '0':
362 *res = false;
363 return 0;
364 case 'o':
365 case 'O':
366 switch (s[1]) {
367 case 'n':
368 case 'N':
369 *res = true;
370 return 0;
371 case 'f':
372 case 'F':
373 *res = false;
374 return 0;
375 default:
376 break;
377 }
378 break;
379 default:
380 break;
381 }
382
383 return -EINVAL;
384}
385#endif
386
387/* This is the one and *ONLY* place where we actually call open
388 * firmware.
389 */
390
391static int __init call_prom(const char *service, int nargs, int nret, ...)
392{
393 int i;
394 struct prom_args args;
395 va_list list;
396
397 args.service = cpu_to_be32(ADDR(service));
398 args.nargs = cpu_to_be32(nargs);
399 args.nret = cpu_to_be32(nret);
400
401 va_start(list, nret);
402 for (i = 0; i < nargs; i++)
403 args.args[i] = cpu_to_be32(va_arg(list, prom_arg_t));
404 va_end(list);
405
406 for (i = 0; i < nret; i++)
407 args.args[nargs+i] = 0;
408
409 if (enter_prom(&args, prom_entry) < 0)
410 return PROM_ERROR;
411
412 return (nret > 0) ? be32_to_cpu(args.args[nargs]) : 0;
413}
414
415static int __init call_prom_ret(const char *service, int nargs, int nret,
416 prom_arg_t *rets, ...)
417{
418 int i;
419 struct prom_args args;
420 va_list list;
421
422 args.service = cpu_to_be32(ADDR(service));
423 args.nargs = cpu_to_be32(nargs);
424 args.nret = cpu_to_be32(nret);
425
426 va_start(list, rets);
427 for (i = 0; i < nargs; i++)
428 args.args[i] = cpu_to_be32(va_arg(list, prom_arg_t));
429 va_end(list);
430
431 for (i = 0; i < nret; i++)
432 args.args[nargs+i] = 0;
433
434 if (enter_prom(&args, prom_entry) < 0)
435 return PROM_ERROR;
436
437 if (rets != NULL)
438 for (i = 1; i < nret; ++i)
439 rets[i-1] = be32_to_cpu(args.args[nargs+i]);
440
441 return (nret > 0) ? be32_to_cpu(args.args[nargs]) : 0;
442}
443
444
445static void __init prom_print(const char *msg)
446{
447 const char *p, *q;
448
449 if (prom.stdout == 0)
450 return;
451
452 for (p = msg; *p != 0; p = q) {
453 for (q = p; *q != 0 && *q != '\n'; ++q)
454 ;
455 if (q > p)
456 call_prom("write", 3, 1, prom.stdout, p, q - p);
457 if (*q == 0)
458 break;
459 ++q;
460 call_prom("write", 3, 1, prom.stdout, ADDR("\r\n"), 2);
461 }
462}
463
464
465/*
466 * Both prom_print_hex & prom_print_dec takes an unsigned long as input so that
467 * we do not need __udivdi3 or __umoddi3 on 32bits.
468 */
469static void __init prom_print_hex(unsigned long val)
470{
471 int i, nibbles = sizeof(val)*2;
472 char buf[sizeof(val)*2+1];
473
474 for (i = nibbles-1; i >= 0; i--) {
475 buf[i] = (val & 0xf) + '0';
476 if (buf[i] > '9')
477 buf[i] += ('a'-'0'-10);
478 val >>= 4;
479 }
480 buf[nibbles] = '\0';
481 call_prom("write", 3, 1, prom.stdout, buf, nibbles);
482}
483
484/* max number of decimal digits in an unsigned long */
485#define UL_DIGITS 21
486static void __init prom_print_dec(unsigned long val)
487{
488 int i, size;
489 char buf[UL_DIGITS+1];
490
491 for (i = UL_DIGITS-1; i >= 0; i--) {
492 buf[i] = (val % 10) + '0';
493 val = val/10;
494 if (val == 0)
495 break;
496 }
497 /* shift stuff down */
498 size = UL_DIGITS - i;
499 call_prom("write", 3, 1, prom.stdout, buf+i, size);
500}
501
502__printf(1, 2)
503static void __init prom_printf(const char *format, ...)
504{
505 const char *p, *q, *s;
506 va_list args;
507 unsigned long v;
508 long vs;
509 int n = 0;
510
511 va_start(args, format);
512 for (p = format; *p != 0; p = q) {
513 for (q = p; *q != 0 && *q != '\n' && *q != '%'; ++q)
514 ;
515 if (q > p)
516 call_prom("write", 3, 1, prom.stdout, p, q - p);
517 if (*q == 0)
518 break;
519 if (*q == '\n') {
520 ++q;
521 call_prom("write", 3, 1, prom.stdout,
522 ADDR("\r\n"), 2);
523 continue;
524 }
525 ++q;
526 if (*q == 0)
527 break;
528 while (*q == 'l') {
529 ++q;
530 ++n;
531 }
532 switch (*q) {
533 case 's':
534 ++q;
535 s = va_arg(args, const char *);
536 prom_print(s);
537 break;
538 case 'x':
539 ++q;
540 switch (n) {
541 case 0:
542 v = va_arg(args, unsigned int);
543 break;
544 case 1:
545 v = va_arg(args, unsigned long);
546 break;
547 case 2:
548 default:
549 v = va_arg(args, unsigned long long);
550 break;
551 }
552 prom_print_hex(v);
553 break;
554 case 'u':
555 ++q;
556 switch (n) {
557 case 0:
558 v = va_arg(args, unsigned int);
559 break;
560 case 1:
561 v = va_arg(args, unsigned long);
562 break;
563 case 2:
564 default:
565 v = va_arg(args, unsigned long long);
566 break;
567 }
568 prom_print_dec(v);
569 break;
570 case 'd':
571 ++q;
572 switch (n) {
573 case 0:
574 vs = va_arg(args, int);
575 break;
576 case 1:
577 vs = va_arg(args, long);
578 break;
579 case 2:
580 default:
581 vs = va_arg(args, long long);
582 break;
583 }
584 if (vs < 0) {
585 prom_print("-");
586 vs = -vs;
587 }
588 prom_print_dec(vs);
589 break;
590 }
591 }
592 va_end(args);
593}
594
595
596static unsigned int __init prom_claim(unsigned long virt, unsigned long size,
597 unsigned long align)
598{
599
600 if (align == 0 && (OF_WORKAROUNDS & OF_WA_CLAIM)) {
601 /*
602 * Old OF requires we claim physical and virtual separately
603 * and then map explicitly (assuming virtual mode)
604 */
605 int ret;
606 prom_arg_t result;
607
608 ret = call_prom_ret("call-method", 5, 2, &result,
609 ADDR("claim"), prom.memory,
610 align, size, virt);
611 if (ret != 0 || result == -1)
612 return -1;
613 ret = call_prom_ret("call-method", 5, 2, &result,
614 ADDR("claim"), prom.mmumap,
615 align, size, virt);
616 if (ret != 0) {
617 call_prom("call-method", 4, 1, ADDR("release"),
618 prom.memory, size, virt);
619 return -1;
620 }
621 /* the 0x12 is M (coherence) + PP == read/write */
622 call_prom("call-method", 6, 1,
623 ADDR("map"), prom.mmumap, 0x12, size, virt, virt);
624 return virt;
625 }
626 return call_prom("claim", 3, 1, (prom_arg_t)virt, (prom_arg_t)size,
627 (prom_arg_t)align);
628}
629
630static void __init __attribute__((noreturn)) prom_panic(const char *reason)
631{
632 prom_print(reason);
633 /* Do not call exit because it clears the screen on pmac
634 * it also causes some sort of double-fault on early pmacs */
635 if (of_platform == PLATFORM_POWERMAC)
636 asm("trap\n");
637
638 /* ToDo: should put up an SRC here on pSeries */
639 call_prom("exit", 0, 0);
640
641 for (;;) /* should never get here */
642 ;
643}
644
645
646static int __init prom_next_node(phandle *nodep)
647{
648 phandle node;
649
650 if ((node = *nodep) != 0
651 && (*nodep = call_prom("child", 1, 1, node)) != 0)
652 return 1;
653 if ((*nodep = call_prom("peer", 1, 1, node)) != 0)
654 return 1;
655 for (;;) {
656 if ((node = call_prom("parent", 1, 1, node)) == 0)
657 return 0;
658 if ((*nodep = call_prom("peer", 1, 1, node)) != 0)
659 return 1;
660 }
661}
662
663static inline int __init prom_getprop(phandle node, const char *pname,
664 void *value, size_t valuelen)
665{
666 return call_prom("getprop", 4, 1, node, ADDR(pname),
667 (u32)(unsigned long) value, (u32) valuelen);
668}
669
670static inline int __init prom_getproplen(phandle node, const char *pname)
671{
672 return call_prom("getproplen", 2, 1, node, ADDR(pname));
673}
674
675static void add_string(char **str, const char *q)
676{
677 char *p = *str;
678
679 while (*q)
680 *p++ = *q++;
681 *p++ = ' ';
682 *str = p;
683}
684
685static char *tohex(unsigned int x)
686{
687 static const char digits[] __initconst = "0123456789abcdef";
688 static char result[9] __prombss;
689 int i;
690
691 result[8] = 0;
692 i = 8;
693 do {
694 --i;
695 result[i] = digits[x & 0xf];
696 x >>= 4;
697 } while (x != 0 && i > 0);
698 return &result[i];
699}
700
701static int __init prom_setprop(phandle node, const char *nodename,
702 const char *pname, void *value, size_t valuelen)
703{
704 char cmd[256], *p;
705
706 if (!(OF_WORKAROUNDS & OF_WA_LONGTRAIL))
707 return call_prom("setprop", 4, 1, node, ADDR(pname),
708 (u32)(unsigned long) value, (u32) valuelen);
709
710 /* gah... setprop doesn't work on longtrail, have to use interpret */
711 p = cmd;
712 add_string(&p, "dev");
713 add_string(&p, nodename);
714 add_string(&p, tohex((u32)(unsigned long) value));
715 add_string(&p, tohex(valuelen));
716 add_string(&p, tohex(ADDR(pname)));
717 add_string(&p, tohex(prom_strlen(pname)));
718 add_string(&p, "property");
719 *p = 0;
720 return call_prom("interpret", 1, 1, (u32)(unsigned long) cmd);
721}
722
723/* We can't use the standard versions because of relocation headaches. */
724#define prom_isxdigit(c) \
725 (('0' <= (c) && (c) <= '9') || ('a' <= (c) && (c) <= 'f') || ('A' <= (c) && (c) <= 'F'))
726
727#define prom_isdigit(c) ('0' <= (c) && (c) <= '9')
728#define prom_islower(c) ('a' <= (c) && (c) <= 'z')
729#define prom_toupper(c) (prom_islower(c) ? ((c) - 'a' + 'A') : (c))
730
731static unsigned long prom_strtoul(const char *cp, const char **endp)
732{
733 unsigned long result = 0, base = 10, value;
734
735 if (*cp == '0') {
736 base = 8;
737 cp++;
738 if (prom_toupper(*cp) == 'X') {
739 cp++;
740 base = 16;
741 }
742 }
743
744 while (prom_isxdigit(*cp) &&
745 (value = prom_isdigit(*cp) ? *cp - '0' : prom_toupper(*cp) - 'A' + 10) < base) {
746 result = result * base + value;
747 cp++;
748 }
749
750 if (endp)
751 *endp = cp;
752
753 return result;
754}
755
756static unsigned long prom_memparse(const char *ptr, const char **retptr)
757{
758 unsigned long ret = prom_strtoul(ptr, retptr);
759 int shift = 0;
760
761 /*
762 * We can't use a switch here because GCC *may* generate a
763 * jump table which won't work, because we're not running at
764 * the address we're linked at.
765 */
766 if ('G' == **retptr || 'g' == **retptr)
767 shift = 30;
768
769 if ('M' == **retptr || 'm' == **retptr)
770 shift = 20;
771
772 if ('K' == **retptr || 'k' == **retptr)
773 shift = 10;
774
775 if (shift) {
776 ret <<= shift;
777 (*retptr)++;
778 }
779
780 return ret;
781}
782
783/*
784 * Early parsing of the command line passed to the kernel, used for
785 * "mem=x" and the options that affect the iommu
786 */
787static void __init early_cmdline_parse(void)
788{
789 const char *opt;
790
791 char *p;
792 int l = 0;
793
794 prom_cmd_line[0] = 0;
795 p = prom_cmd_line;
796
797 if (!IS_ENABLED(CONFIG_CMDLINE_FORCE) && (long)prom.chosen > 0)
798 l = prom_getprop(prom.chosen, "bootargs", p, COMMAND_LINE_SIZE-1);
799
800 if (IS_ENABLED(CONFIG_CMDLINE_EXTEND) || l <= 0 || p[0] == '\0')
801 prom_strlcat(prom_cmd_line, " " CONFIG_CMDLINE,
802 sizeof(prom_cmd_line));
803
804 prom_printf("command line: %s\n", prom_cmd_line);
805
806#ifdef CONFIG_PPC64
807 opt = prom_strstr(prom_cmd_line, "iommu=");
808 if (opt) {
809 prom_printf("iommu opt is: %s\n", opt);
810 opt += 6;
811 while (*opt && *opt == ' ')
812 opt++;
813 if (!prom_strncmp(opt, "off", 3))
814 prom_iommu_off = 1;
815 else if (!prom_strncmp(opt, "force", 5))
816 prom_iommu_force_on = 1;
817 }
818#endif
819 opt = prom_strstr(prom_cmd_line, "mem=");
820 if (opt) {
821 opt += 4;
822 prom_memory_limit = prom_memparse(opt, (const char **)&opt);
823#ifdef CONFIG_PPC64
824 /* Align to 16 MB == size of ppc64 large page */
825 prom_memory_limit = ALIGN(prom_memory_limit, 0x1000000);
826#endif
827 }
828
829#ifdef CONFIG_PPC_PSERIES
830 prom_radix_disable = !IS_ENABLED(CONFIG_PPC_RADIX_MMU_DEFAULT);
831 opt = prom_strstr(prom_cmd_line, "disable_radix");
832 if (opt) {
833 opt += 13;
834 if (*opt && *opt == '=') {
835 bool val;
836
837 if (prom_strtobool(++opt, &val))
838 prom_radix_disable = false;
839 else
840 prom_radix_disable = val;
841 } else
842 prom_radix_disable = true;
843 }
844 if (prom_radix_disable)
845 prom_debug("Radix disabled from cmdline\n");
846
847 opt = prom_strstr(prom_cmd_line, "radix_hcall_invalidate=on");
848 if (opt) {
849 prom_radix_gtse_disable = true;
850 prom_debug("Radix GTSE disabled from cmdline\n");
851 }
852
853 opt = prom_strstr(prom_cmd_line, "xive=off");
854 if (opt) {
855 prom_xive_disable = true;
856 prom_debug("XIVE disabled from cmdline\n");
857 }
858#endif /* CONFIG_PPC_PSERIES */
859
860#ifdef CONFIG_PPC_SVM
861 opt = prom_strstr(prom_cmd_line, "svm=");
862 if (opt) {
863 bool val;
864
865 opt += sizeof("svm=") - 1;
866 if (!prom_strtobool(opt, &val))
867 prom_svm_enable = val;
868 }
869#endif /* CONFIG_PPC_SVM */
870}
871
872#ifdef CONFIG_PPC_PSERIES
873/*
874 * The architecture vector has an array of PVR mask/value pairs,
875 * followed by # option vectors - 1, followed by the option vectors.
876 *
877 * See prom.h for the definition of the bits specified in the
878 * architecture vector.
879 */
880
881/* Firmware expects the value to be n - 1, where n is the # of vectors */
882#define NUM_VECTORS(n) ((n) - 1)
883
884/*
885 * Firmware expects 1 + n - 2, where n is the length of the option vector in
886 * bytes. The 1 accounts for the length byte itself, the - 2 .. ?
887 */
888#define VECTOR_LENGTH(n) (1 + (n) - 2)
889
890struct option_vector1 {
891 u8 byte1;
892 u8 arch_versions;
893 u8 arch_versions3;
894} __packed;
895
896struct option_vector2 {
897 u8 byte1;
898 __be16 reserved;
899 __be32 real_base;
900 __be32 real_size;
901 __be32 virt_base;
902 __be32 virt_size;
903 __be32 load_base;
904 __be32 min_rma;
905 __be32 min_load;
906 u8 min_rma_percent;
907 u8 max_pft_size;
908} __packed;
909
910struct option_vector3 {
911 u8 byte1;
912 u8 byte2;
913} __packed;
914
915struct option_vector4 {
916 u8 byte1;
917 u8 min_vp_cap;
918} __packed;
919
920struct option_vector5 {
921 u8 byte1;
922 u8 byte2;
923 u8 byte3;
924 u8 cmo;
925 u8 associativity;
926 u8 bin_opts;
927 u8 micro_checkpoint;
928 u8 reserved0;
929 __be32 max_cpus;
930 __be16 papr_level;
931 __be16 reserved1;
932 u8 platform_facilities;
933 u8 reserved2;
934 __be16 reserved3;
935 u8 subprocessors;
936 u8 byte22;
937 u8 intarch;
938 u8 mmu;
939 u8 hash_ext;
940 u8 radix_ext;
941} __packed;
942
943struct option_vector6 {
944 u8 reserved;
945 u8 secondary_pteg;
946 u8 os_name;
947} __packed;
948
949struct option_vector7 {
950 u8 os_id[256];
951} __packed;
952
953struct ibm_arch_vec {
954 struct { u32 mask, val; } pvrs[14];
955
956 u8 num_vectors;
957
958 u8 vec1_len;
959 struct option_vector1 vec1;
960
961 u8 vec2_len;
962 struct option_vector2 vec2;
963
964 u8 vec3_len;
965 struct option_vector3 vec3;
966
967 u8 vec4_len;
968 struct option_vector4 vec4;
969
970 u8 vec5_len;
971 struct option_vector5 vec5;
972
973 u8 vec6_len;
974 struct option_vector6 vec6;
975
976 u8 vec7_len;
977 struct option_vector7 vec7;
978} __packed;
979
980static const struct ibm_arch_vec ibm_architecture_vec_template __initconst = {
981 .pvrs = {
982 {
983 .mask = cpu_to_be32(0xfffe0000), /* POWER5/POWER5+ */
984 .val = cpu_to_be32(0x003a0000),
985 },
986 {
987 .mask = cpu_to_be32(0xffff0000), /* POWER6 */
988 .val = cpu_to_be32(0x003e0000),
989 },
990 {
991 .mask = cpu_to_be32(0xffff0000), /* POWER7 */
992 .val = cpu_to_be32(0x003f0000),
993 },
994 {
995 .mask = cpu_to_be32(0xffff0000), /* POWER8E */
996 .val = cpu_to_be32(0x004b0000),
997 },
998 {
999 .mask = cpu_to_be32(0xffff0000), /* POWER8NVL */
1000 .val = cpu_to_be32(0x004c0000),
1001 },
1002 {
1003 .mask = cpu_to_be32(0xffff0000), /* POWER8 */
1004 .val = cpu_to_be32(0x004d0000),
1005 },
1006 {
1007 .mask = cpu_to_be32(0xffff0000), /* POWER9 */
1008 .val = cpu_to_be32(0x004e0000),
1009 },
1010 {
1011 .mask = cpu_to_be32(0xffff0000), /* POWER10 */
1012 .val = cpu_to_be32(0x00800000),
1013 },
1014 {
1015 .mask = cpu_to_be32(0xffffffff), /* all 3.1-compliant */
1016 .val = cpu_to_be32(0x0f000006),
1017 },
1018 {
1019 .mask = cpu_to_be32(0xffffffff), /* all 3.00-compliant */
1020 .val = cpu_to_be32(0x0f000005),
1021 },
1022 {
1023 .mask = cpu_to_be32(0xffffffff), /* all 2.07-compliant */
1024 .val = cpu_to_be32(0x0f000004),
1025 },
1026 {
1027 .mask = cpu_to_be32(0xffffffff), /* all 2.06-compliant */
1028 .val = cpu_to_be32(0x0f000003),
1029 },
1030 {
1031 .mask = cpu_to_be32(0xffffffff), /* all 2.05-compliant */
1032 .val = cpu_to_be32(0x0f000002),
1033 },
1034 {
1035 .mask = cpu_to_be32(0xfffffffe), /* all 2.04-compliant and earlier */
1036 .val = cpu_to_be32(0x0f000001),
1037 },
1038 },
1039
1040 .num_vectors = NUM_VECTORS(6),
1041
1042 .vec1_len = VECTOR_LENGTH(sizeof(struct option_vector1)),
1043 .vec1 = {
1044 .byte1 = 0,
1045 .arch_versions = OV1_PPC_2_00 | OV1_PPC_2_01 | OV1_PPC_2_02 | OV1_PPC_2_03 |
1046 OV1_PPC_2_04 | OV1_PPC_2_05 | OV1_PPC_2_06 | OV1_PPC_2_07,
1047 .arch_versions3 = OV1_PPC_3_00 | OV1_PPC_3_1,
1048 },
1049
1050 .vec2_len = VECTOR_LENGTH(sizeof(struct option_vector2)),
1051 /* option vector 2: Open Firmware options supported */
1052 .vec2 = {
1053 .byte1 = OV2_REAL_MODE,
1054 .reserved = 0,
1055 .real_base = cpu_to_be32(0xffffffff),
1056 .real_size = cpu_to_be32(0xffffffff),
1057 .virt_base = cpu_to_be32(0xffffffff),
1058 .virt_size = cpu_to_be32(0xffffffff),
1059 .load_base = cpu_to_be32(0xffffffff),
1060 .min_rma = cpu_to_be32(512), /* 512MB min RMA */
1061 .min_load = cpu_to_be32(0xffffffff), /* full client load */
1062 .min_rma_percent = 0, /* min RMA percentage of total RAM */
1063 .max_pft_size = 48, /* max log_2(hash table size) */
1064 },
1065
1066 .vec3_len = VECTOR_LENGTH(sizeof(struct option_vector3)),
1067 /* option vector 3: processor options supported */
1068 .vec3 = {
1069 .byte1 = 0, /* don't ignore, don't halt */
1070 .byte2 = OV3_FP | OV3_VMX | OV3_DFP,
1071 },
1072
1073 .vec4_len = VECTOR_LENGTH(sizeof(struct option_vector4)),
1074 /* option vector 4: IBM PAPR implementation */
1075 .vec4 = {
1076 .byte1 = 0, /* don't halt */
1077 .min_vp_cap = OV4_MIN_ENT_CAP, /* minimum VP entitled capacity */
1078 },
1079
1080 .vec5_len = VECTOR_LENGTH(sizeof(struct option_vector5)),
1081 /* option vector 5: PAPR/OF options */
1082 .vec5 = {
1083 .byte1 = 0, /* don't ignore, don't halt */
1084 .byte2 = OV5_FEAT(OV5_LPAR) | OV5_FEAT(OV5_SPLPAR) | OV5_FEAT(OV5_LARGE_PAGES) |
1085 OV5_FEAT(OV5_DRCONF_MEMORY) | OV5_FEAT(OV5_DONATE_DEDICATE_CPU) |
1086#ifdef CONFIG_PCI_MSI
1087 /* PCIe/MSI support. Without MSI full PCIe is not supported */
1088 OV5_FEAT(OV5_MSI),
1089#else
1090 0,
1091#endif
1092 .byte3 = 0,
1093 .cmo =
1094#ifdef CONFIG_PPC_SMLPAR
1095 OV5_FEAT(OV5_CMO) | OV5_FEAT(OV5_XCMO),
1096#else
1097 0,
1098#endif
1099 .associativity = OV5_FEAT(OV5_TYPE1_AFFINITY) | OV5_FEAT(OV5_PRRN),
1100 .bin_opts = OV5_FEAT(OV5_RESIZE_HPT) | OV5_FEAT(OV5_HP_EVT),
1101 .micro_checkpoint = 0,
1102 .reserved0 = 0,
1103 .max_cpus = cpu_to_be32(NR_CPUS), /* number of cores supported */
1104 .papr_level = 0,
1105 .reserved1 = 0,
1106 .platform_facilities = OV5_FEAT(OV5_PFO_HW_RNG) | OV5_FEAT(OV5_PFO_HW_ENCR) | OV5_FEAT(OV5_PFO_HW_842),
1107 .reserved2 = 0,
1108 .reserved3 = 0,
1109 .subprocessors = 1,
1110 .byte22 = OV5_FEAT(OV5_DRMEM_V2) | OV5_FEAT(OV5_DRC_INFO),
1111 .intarch = 0,
1112 .mmu = 0,
1113 .hash_ext = 0,
1114 .radix_ext = 0,
1115 },
1116
1117 /* option vector 6: IBM PAPR hints */
1118 .vec6_len = VECTOR_LENGTH(sizeof(struct option_vector6)),
1119 .vec6 = {
1120 .reserved = 0,
1121 .secondary_pteg = 0,
1122 .os_name = OV6_LINUX,
1123 },
1124
1125 /* option vector 7: OS Identification */
1126 .vec7_len = VECTOR_LENGTH(sizeof(struct option_vector7)),
1127};
1128
1129static struct ibm_arch_vec __prombss ibm_architecture_vec ____cacheline_aligned;
1130
1131/* Old method - ELF header with PT_NOTE sections only works on BE */
1132#ifdef __BIG_ENDIAN__
1133static const struct fake_elf {
1134 Elf32_Ehdr elfhdr;
1135 Elf32_Phdr phdr[2];
1136 struct chrpnote {
1137 u32 namesz;
1138 u32 descsz;
1139 u32 type;
1140 char name[8]; /* "PowerPC" */
1141 struct chrpdesc {
1142 u32 real_mode;
1143 u32 real_base;
1144 u32 real_size;
1145 u32 virt_base;
1146 u32 virt_size;
1147 u32 load_base;
1148 } chrpdesc;
1149 } chrpnote;
1150 struct rpanote {
1151 u32 namesz;
1152 u32 descsz;
1153 u32 type;
1154 char name[24]; /* "IBM,RPA-Client-Config" */
1155 struct rpadesc {
1156 u32 lpar_affinity;
1157 u32 min_rmo_size;
1158 u32 min_rmo_percent;
1159 u32 max_pft_size;
1160 u32 splpar;
1161 u32 min_load;
1162 u32 new_mem_def;
1163 u32 ignore_me;
1164 } rpadesc;
1165 } rpanote;
1166} fake_elf __initconst = {
1167 .elfhdr = {
1168 .e_ident = { 0x7f, 'E', 'L', 'F',
1169 ELFCLASS32, ELFDATA2MSB, EV_CURRENT },
1170 .e_type = ET_EXEC, /* yeah right */
1171 .e_machine = EM_PPC,
1172 .e_version = EV_CURRENT,
1173 .e_phoff = offsetof(struct fake_elf, phdr),
1174 .e_phentsize = sizeof(Elf32_Phdr),
1175 .e_phnum = 2
1176 },
1177 .phdr = {
1178 [0] = {
1179 .p_type = PT_NOTE,
1180 .p_offset = offsetof(struct fake_elf, chrpnote),
1181 .p_filesz = sizeof(struct chrpnote)
1182 }, [1] = {
1183 .p_type = PT_NOTE,
1184 .p_offset = offsetof(struct fake_elf, rpanote),
1185 .p_filesz = sizeof(struct rpanote)
1186 }
1187 },
1188 .chrpnote = {
1189 .namesz = sizeof("PowerPC"),
1190 .descsz = sizeof(struct chrpdesc),
1191 .type = 0x1275,
1192 .name = "PowerPC",
1193 .chrpdesc = {
1194 .real_mode = ~0U, /* ~0 means "don't care" */
1195 .real_base = ~0U,
1196 .real_size = ~0U,
1197 .virt_base = ~0U,
1198 .virt_size = ~0U,
1199 .load_base = ~0U
1200 },
1201 },
1202 .rpanote = {
1203 .namesz = sizeof("IBM,RPA-Client-Config"),
1204 .descsz = sizeof(struct rpadesc),
1205 .type = 0x12759999,
1206 .name = "IBM,RPA-Client-Config",
1207 .rpadesc = {
1208 .lpar_affinity = 0,
1209 .min_rmo_size = 64, /* in megabytes */
1210 .min_rmo_percent = 0,
1211 .max_pft_size = 48, /* 2^48 bytes max PFT size */
1212 .splpar = 1,
1213 .min_load = ~0U,
1214 .new_mem_def = 0
1215 }
1216 }
1217};
1218#endif /* __BIG_ENDIAN__ */
1219
1220static int __init prom_count_smt_threads(void)
1221{
1222 phandle node;
1223 char type[64];
1224 unsigned int plen;
1225
1226 /* Pick up th first CPU node we can find */
1227 for (node = 0; prom_next_node(&node); ) {
1228 type[0] = 0;
1229 prom_getprop(node, "device_type", type, sizeof(type));
1230
1231 if (prom_strcmp(type, "cpu"))
1232 continue;
1233 /*
1234 * There is an entry for each smt thread, each entry being
1235 * 4 bytes long. All cpus should have the same number of
1236 * smt threads, so return after finding the first.
1237 */
1238 plen = prom_getproplen(node, "ibm,ppc-interrupt-server#s");
1239 if (plen == PROM_ERROR)
1240 break;
1241 plen >>= 2;
1242 prom_debug("Found %lu smt threads per core\n", (unsigned long)plen);
1243
1244 /* Sanity check */
1245 if (plen < 1 || plen > 64) {
1246 prom_printf("Threads per core %lu out of bounds, assuming 1\n",
1247 (unsigned long)plen);
1248 return 1;
1249 }
1250 return plen;
1251 }
1252 prom_debug("No threads found, assuming 1 per core\n");
1253
1254 return 1;
1255
1256}
1257
1258static void __init prom_parse_mmu_model(u8 val,
1259 struct platform_support *support)
1260{
1261 switch (val) {
1262 case OV5_FEAT(OV5_MMU_DYNAMIC):
1263 case OV5_FEAT(OV5_MMU_EITHER): /* Either Available */
1264 prom_debug("MMU - either supported\n");
1265 support->radix_mmu = !prom_radix_disable;
1266 support->hash_mmu = true;
1267 break;
1268 case OV5_FEAT(OV5_MMU_RADIX): /* Only Radix */
1269 prom_debug("MMU - radix only\n");
1270 if (prom_radix_disable) {
1271 /*
1272 * If we __have__ to do radix, we're better off ignoring
1273 * the command line rather than not booting.
1274 */
1275 prom_printf("WARNING: Ignoring cmdline option disable_radix\n");
1276 }
1277 support->radix_mmu = true;
1278 break;
1279 case OV5_FEAT(OV5_MMU_HASH):
1280 prom_debug("MMU - hash only\n");
1281 support->hash_mmu = true;
1282 break;
1283 default:
1284 prom_debug("Unknown mmu support option: 0x%x\n", val);
1285 break;
1286 }
1287}
1288
1289static void __init prom_parse_xive_model(u8 val,
1290 struct platform_support *support)
1291{
1292 switch (val) {
1293 case OV5_FEAT(OV5_XIVE_EITHER): /* Either Available */
1294 prom_debug("XIVE - either mode supported\n");
1295 support->xive = !prom_xive_disable;
1296 break;
1297 case OV5_FEAT(OV5_XIVE_EXPLOIT): /* Only Exploitation mode */
1298 prom_debug("XIVE - exploitation mode supported\n");
1299 if (prom_xive_disable) {
1300 /*
1301 * If we __have__ to do XIVE, we're better off ignoring
1302 * the command line rather than not booting.
1303 */
1304 prom_printf("WARNING: Ignoring cmdline option xive=off\n");
1305 }
1306 support->xive = true;
1307 break;
1308 case OV5_FEAT(OV5_XIVE_LEGACY): /* Only Legacy mode */
1309 prom_debug("XIVE - legacy mode supported\n");
1310 break;
1311 default:
1312 prom_debug("Unknown xive support option: 0x%x\n", val);
1313 break;
1314 }
1315}
1316
1317static void __init prom_parse_platform_support(u8 index, u8 val,
1318 struct platform_support *support)
1319{
1320 switch (index) {
1321 case OV5_INDX(OV5_MMU_SUPPORT): /* MMU Model */
1322 prom_parse_mmu_model(val & OV5_FEAT(OV5_MMU_SUPPORT), support);
1323 break;
1324 case OV5_INDX(OV5_RADIX_GTSE): /* Radix Extensions */
1325 if (val & OV5_FEAT(OV5_RADIX_GTSE))
1326 support->radix_gtse = !prom_radix_gtse_disable;
1327 break;
1328 case OV5_INDX(OV5_XIVE_SUPPORT): /* Interrupt mode */
1329 prom_parse_xive_model(val & OV5_FEAT(OV5_XIVE_SUPPORT),
1330 support);
1331 break;
1332 }
1333}
1334
1335static void __init prom_check_platform_support(void)
1336{
1337 struct platform_support supported = {
1338 .hash_mmu = false,
1339 .radix_mmu = false,
1340 .radix_gtse = false,
1341 .xive = false
1342 };
1343 int prop_len = prom_getproplen(prom.chosen,
1344 "ibm,arch-vec-5-platform-support");
1345
1346 /*
1347 * First copy the architecture vec template
1348 *
1349 * use memcpy() instead of *vec = *vec_template so that GCC replaces it
1350 * by __memcpy() when KASAN is active
1351 */
1352 memcpy(&ibm_architecture_vec, &ibm_architecture_vec_template,
1353 sizeof(ibm_architecture_vec));
1354
1355 prom_strscpy_pad(ibm_architecture_vec.vec7.os_id, linux_banner, 256);
1356
1357 if (prop_len > 1) {
1358 int i;
1359 u8 vec[8];
1360 prom_debug("Found ibm,arch-vec-5-platform-support, len: %d\n",
1361 prop_len);
1362 if (prop_len > sizeof(vec))
1363 prom_printf("WARNING: ibm,arch-vec-5-platform-support longer than expected (len: %d)\n",
1364 prop_len);
1365 prom_getprop(prom.chosen, "ibm,arch-vec-5-platform-support", &vec, sizeof(vec));
1366 for (i = 0; i < prop_len; i += 2) {
1367 prom_debug("%d: index = 0x%x val = 0x%x\n", i / 2, vec[i], vec[i + 1]);
1368 prom_parse_platform_support(vec[i], vec[i + 1], &supported);
1369 }
1370 }
1371
1372 if (supported.radix_mmu && IS_ENABLED(CONFIG_PPC_RADIX_MMU)) {
1373 /* Radix preferred - Check if GTSE is also supported */
1374 prom_debug("Asking for radix\n");
1375 ibm_architecture_vec.vec5.mmu = OV5_FEAT(OV5_MMU_RADIX);
1376 if (supported.radix_gtse)
1377 ibm_architecture_vec.vec5.radix_ext =
1378 OV5_FEAT(OV5_RADIX_GTSE);
1379 else
1380 prom_debug("Radix GTSE isn't supported\n");
1381 } else if (supported.hash_mmu) {
1382 /* Default to hash mmu (if we can) */
1383 prom_debug("Asking for hash\n");
1384 ibm_architecture_vec.vec5.mmu = OV5_FEAT(OV5_MMU_HASH);
1385 } else {
1386 /* We're probably on a legacy hypervisor */
1387 prom_debug("Assuming legacy hash support\n");
1388 }
1389
1390 if (supported.xive) {
1391 prom_debug("Asking for XIVE\n");
1392 ibm_architecture_vec.vec5.intarch = OV5_FEAT(OV5_XIVE_EXPLOIT);
1393 }
1394}
1395
1396static void __init prom_send_capabilities(void)
1397{
1398 ihandle root;
1399 prom_arg_t ret;
1400 u32 cores;
1401
1402 /* Check ibm,arch-vec-5-platform-support and fixup vec5 if required */
1403 prom_check_platform_support();
1404
1405 root = call_prom("open", 1, 1, ADDR("/"));
1406 if (root != 0) {
1407 /* We need to tell the FW about the number of cores we support.
1408 *
1409 * To do that, we count the number of threads on the first core
1410 * (we assume this is the same for all cores) and use it to
1411 * divide NR_CPUS.
1412 */
1413
1414 cores = DIV_ROUND_UP(NR_CPUS, prom_count_smt_threads());
1415 prom_printf("Max number of cores passed to firmware: %u (NR_CPUS = %d)\n",
1416 cores, NR_CPUS);
1417
1418 ibm_architecture_vec.vec5.max_cpus = cpu_to_be32(cores);
1419
1420 /* try calling the ibm,client-architecture-support method */
1421 prom_printf("Calling ibm,client-architecture-support...");
1422 if (call_prom_ret("call-method", 3, 2, &ret,
1423 ADDR("ibm,client-architecture-support"),
1424 root,
1425 ADDR(&ibm_architecture_vec)) == 0) {
1426 /* the call exists... */
1427 if (ret)
1428 prom_printf("\nWARNING: ibm,client-architecture"
1429 "-support call FAILED!\n");
1430 call_prom("close", 1, 0, root);
1431 prom_printf(" done\n");
1432 return;
1433 }
1434 call_prom("close", 1, 0, root);
1435 prom_printf(" not implemented\n");
1436 }
1437
1438#ifdef __BIG_ENDIAN__
1439 {
1440 ihandle elfloader;
1441
1442 /* no ibm,client-architecture-support call, try the old way */
1443 elfloader = call_prom("open", 1, 1,
1444 ADDR("/packages/elf-loader"));
1445 if (elfloader == 0) {
1446 prom_printf("couldn't open /packages/elf-loader\n");
1447 return;
1448 }
1449 call_prom("call-method", 3, 1, ADDR("process-elf-header"),
1450 elfloader, ADDR(&fake_elf));
1451 call_prom("close", 1, 0, elfloader);
1452 }
1453#endif /* __BIG_ENDIAN__ */
1454}
1455#endif /* CONFIG_PPC_PSERIES */
1456
1457/*
1458 * Memory allocation strategy... our layout is normally:
1459 *
1460 * at 14Mb or more we have vmlinux, then a gap and initrd. In some
1461 * rare cases, initrd might end up being before the kernel though.
1462 * We assume this won't override the final kernel at 0, we have no
1463 * provision to handle that in this version, but it should hopefully
1464 * never happen.
1465 *
1466 * alloc_top is set to the top of RMO, eventually shrink down if the
1467 * TCEs overlap
1468 *
1469 * alloc_bottom is set to the top of kernel/initrd
1470 *
1471 * from there, allocations are done this way : rtas is allocated
1472 * topmost, and the device-tree is allocated from the bottom. We try
1473 * to grow the device-tree allocation as we progress. If we can't,
1474 * then we fail, we don't currently have a facility to restart
1475 * elsewhere, but that shouldn't be necessary.
1476 *
1477 * Note that calls to reserve_mem have to be done explicitly, memory
1478 * allocated with either alloc_up or alloc_down isn't automatically
1479 * reserved.
1480 */
1481
1482
1483/*
1484 * Allocates memory in the RMO upward from the kernel/initrd
1485 *
1486 * When align is 0, this is a special case, it means to allocate in place
1487 * at the current location of alloc_bottom or fail (that is basically
1488 * extending the previous allocation). Used for the device-tree flattening
1489 */
1490static unsigned long __init alloc_up(unsigned long size, unsigned long align)
1491{
1492 unsigned long base = alloc_bottom;
1493 unsigned long addr = 0;
1494
1495 if (align)
1496 base = ALIGN(base, align);
1497 prom_debug("%s(%lx, %lx)\n", __func__, size, align);
1498 if (ram_top == 0)
1499 prom_panic("alloc_up() called with mem not initialized\n");
1500
1501 if (align)
1502 base = ALIGN(alloc_bottom, align);
1503 else
1504 base = alloc_bottom;
1505
1506 for(; (base + size) <= alloc_top;
1507 base = ALIGN(base + 0x100000, align)) {
1508 prom_debug(" trying: 0x%lx\n\r", base);
1509 addr = (unsigned long)prom_claim(base, size, 0);
1510 if (addr != PROM_ERROR && addr != 0)
1511 break;
1512 addr = 0;
1513 if (align == 0)
1514 break;
1515 }
1516 if (addr == 0)
1517 return 0;
1518 alloc_bottom = addr + size;
1519
1520 prom_debug(" -> %lx\n", addr);
1521 prom_debug(" alloc_bottom : %lx\n", alloc_bottom);
1522 prom_debug(" alloc_top : %lx\n", alloc_top);
1523 prom_debug(" alloc_top_hi : %lx\n", alloc_top_high);
1524 prom_debug(" rmo_top : %lx\n", rmo_top);
1525 prom_debug(" ram_top : %lx\n", ram_top);
1526
1527 return addr;
1528}
1529
1530/*
1531 * Allocates memory downward, either from top of RMO, or if highmem
1532 * is set, from the top of RAM. Note that this one doesn't handle
1533 * failures. It does claim memory if highmem is not set.
1534 */
1535static unsigned long __init alloc_down(unsigned long size, unsigned long align,
1536 int highmem)
1537{
1538 unsigned long base, addr = 0;
1539
1540 prom_debug("%s(%lx, %lx, %s)\n", __func__, size, align,
1541 highmem ? "(high)" : "(low)");
1542 if (ram_top == 0)
1543 prom_panic("alloc_down() called with mem not initialized\n");
1544
1545 if (highmem) {
1546 /* Carve out storage for the TCE table. */
1547 addr = ALIGN_DOWN(alloc_top_high - size, align);
1548 if (addr <= alloc_bottom)
1549 return 0;
1550 /* Will we bump into the RMO ? If yes, check out that we
1551 * didn't overlap existing allocations there, if we did,
1552 * we are dead, we must be the first in town !
1553 */
1554 if (addr < rmo_top) {
1555 /* Good, we are first */
1556 if (alloc_top == rmo_top)
1557 alloc_top = rmo_top = addr;
1558 else
1559 return 0;
1560 }
1561 alloc_top_high = addr;
1562 goto bail;
1563 }
1564
1565 base = ALIGN_DOWN(alloc_top - size, align);
1566 for (; base > alloc_bottom;
1567 base = ALIGN_DOWN(base - 0x100000, align)) {
1568 prom_debug(" trying: 0x%lx\n\r", base);
1569 addr = (unsigned long)prom_claim(base, size, 0);
1570 if (addr != PROM_ERROR && addr != 0)
1571 break;
1572 addr = 0;
1573 }
1574 if (addr == 0)
1575 return 0;
1576 alloc_top = addr;
1577
1578 bail:
1579 prom_debug(" -> %lx\n", addr);
1580 prom_debug(" alloc_bottom : %lx\n", alloc_bottom);
1581 prom_debug(" alloc_top : %lx\n", alloc_top);
1582 prom_debug(" alloc_top_hi : %lx\n", alloc_top_high);
1583 prom_debug(" rmo_top : %lx\n", rmo_top);
1584 prom_debug(" ram_top : %lx\n", ram_top);
1585
1586 return addr;
1587}
1588
1589/*
1590 * Parse a "reg" cell
1591 */
1592static unsigned long __init prom_next_cell(int s, cell_t **cellp)
1593{
1594 cell_t *p = *cellp;
1595 unsigned long r = 0;
1596
1597 /* Ignore more than 2 cells */
1598 while (s > sizeof(unsigned long) / 4) {
1599 p++;
1600 s--;
1601 }
1602 r = be32_to_cpu(*p++);
1603#ifdef CONFIG_PPC64
1604 if (s > 1) {
1605 r <<= 32;
1606 r |= be32_to_cpu(*(p++));
1607 }
1608#endif
1609 *cellp = p;
1610 return r;
1611}
1612
1613/*
1614 * Very dumb function for adding to the memory reserve list, but
1615 * we don't need anything smarter at this point
1616 *
1617 * XXX Eventually check for collisions. They should NEVER happen.
1618 * If problems seem to show up, it would be a good start to track
1619 * them down.
1620 */
1621static void __init reserve_mem(u64 base, u64 size)
1622{
1623 u64 top = base + size;
1624 unsigned long cnt = mem_reserve_cnt;
1625
1626 if (size == 0)
1627 return;
1628
1629 /* We need to always keep one empty entry so that we
1630 * have our terminator with "size" set to 0 since we are
1631 * dumb and just copy this entire array to the boot params
1632 */
1633 base = ALIGN_DOWN(base, PAGE_SIZE);
1634 top = ALIGN(top, PAGE_SIZE);
1635 size = top - base;
1636
1637 if (cnt >= (MEM_RESERVE_MAP_SIZE - 1))
1638 prom_panic("Memory reserve map exhausted !\n");
1639 mem_reserve_map[cnt].base = cpu_to_be64(base);
1640 mem_reserve_map[cnt].size = cpu_to_be64(size);
1641 mem_reserve_cnt = cnt + 1;
1642}
1643
1644/*
1645 * Initialize memory allocation mechanism, parse "memory" nodes and
1646 * obtain that way the top of memory and RMO to setup out local allocator
1647 */
1648static void __init prom_init_mem(void)
1649{
1650 phandle node;
1651 char type[64];
1652 unsigned int plen;
1653 cell_t *p, *endp;
1654 __be32 val;
1655 u32 rac, rsc;
1656
1657 /*
1658 * We iterate the memory nodes to find
1659 * 1) top of RMO (first node)
1660 * 2) top of memory
1661 */
1662 val = cpu_to_be32(2);
1663 prom_getprop(prom.root, "#address-cells", &val, sizeof(val));
1664 rac = be32_to_cpu(val);
1665 val = cpu_to_be32(1);
1666 prom_getprop(prom.root, "#size-cells", &val, sizeof(rsc));
1667 rsc = be32_to_cpu(val);
1668 prom_debug("root_addr_cells: %x\n", rac);
1669 prom_debug("root_size_cells: %x\n", rsc);
1670
1671 prom_debug("scanning memory:\n");
1672
1673 for (node = 0; prom_next_node(&node); ) {
1674 type[0] = 0;
1675 prom_getprop(node, "device_type", type, sizeof(type));
1676
1677 if (type[0] == 0) {
1678 /*
1679 * CHRP Longtrail machines have no device_type
1680 * on the memory node, so check the name instead...
1681 */
1682 prom_getprop(node, "name", type, sizeof(type));
1683 }
1684 if (prom_strcmp(type, "memory"))
1685 continue;
1686
1687 plen = prom_getprop(node, "reg", regbuf, sizeof(regbuf));
1688 if (plen > sizeof(regbuf)) {
1689 prom_printf("memory node too large for buffer !\n");
1690 plen = sizeof(regbuf);
1691 }
1692 p = regbuf;
1693 endp = p + (plen / sizeof(cell_t));
1694
1695#ifdef DEBUG_PROM
1696 memset(prom_scratch, 0, sizeof(prom_scratch));
1697 call_prom("package-to-path", 3, 1, node, prom_scratch,
1698 sizeof(prom_scratch) - 1);
1699 prom_debug(" node %s :\n", prom_scratch);
1700#endif /* DEBUG_PROM */
1701
1702 while ((endp - p) >= (rac + rsc)) {
1703 unsigned long base, size;
1704
1705 base = prom_next_cell(rac, &p);
1706 size = prom_next_cell(rsc, &p);
1707
1708 if (size == 0)
1709 continue;
1710 prom_debug(" %lx %lx\n", base, size);
1711 if (base == 0 && (of_platform & PLATFORM_LPAR))
1712 rmo_top = size;
1713 if ((base + size) > ram_top)
1714 ram_top = base + size;
1715 }
1716 }
1717
1718 alloc_bottom = PAGE_ALIGN((unsigned long)&_end + 0x4000);
1719
1720 /*
1721 * If prom_memory_limit is set we reduce the upper limits *except* for
1722 * alloc_top_high. This must be the real top of RAM so we can put
1723 * TCE's up there.
1724 */
1725
1726 alloc_top_high = ram_top;
1727
1728 if (prom_memory_limit) {
1729 if (prom_memory_limit <= alloc_bottom) {
1730 prom_printf("Ignoring mem=%lx <= alloc_bottom.\n",
1731 prom_memory_limit);
1732 prom_memory_limit = 0;
1733 } else if (prom_memory_limit >= ram_top) {
1734 prom_printf("Ignoring mem=%lx >= ram_top.\n",
1735 prom_memory_limit);
1736 prom_memory_limit = 0;
1737 } else {
1738 ram_top = prom_memory_limit;
1739 rmo_top = min(rmo_top, prom_memory_limit);
1740 }
1741 }
1742
1743 /*
1744 * Setup our top alloc point, that is top of RMO or top of
1745 * segment 0 when running non-LPAR.
1746 * Some RS64 machines have buggy firmware where claims up at
1747 * 1GB fail. Cap at 768MB as a workaround.
1748 * Since 768MB is plenty of room, and we need to cap to something
1749 * reasonable on 32-bit, cap at 768MB on all machines.
1750 */
1751 if (!rmo_top)
1752 rmo_top = ram_top;
1753 rmo_top = min(0x30000000ul, rmo_top);
1754 alloc_top = rmo_top;
1755 alloc_top_high = ram_top;
1756
1757 /*
1758 * Check if we have an initrd after the kernel but still inside
1759 * the RMO. If we do move our bottom point to after it.
1760 */
1761 if (prom_initrd_start &&
1762 prom_initrd_start < rmo_top &&
1763 prom_initrd_end > alloc_bottom)
1764 alloc_bottom = PAGE_ALIGN(prom_initrd_end);
1765
1766 prom_printf("memory layout at init:\n");
1767 prom_printf(" memory_limit : %lx (16 MB aligned)\n",
1768 prom_memory_limit);
1769 prom_printf(" alloc_bottom : %lx\n", alloc_bottom);
1770 prom_printf(" alloc_top : %lx\n", alloc_top);
1771 prom_printf(" alloc_top_hi : %lx\n", alloc_top_high);
1772 prom_printf(" rmo_top : %lx\n", rmo_top);
1773 prom_printf(" ram_top : %lx\n", ram_top);
1774}
1775
1776static void __init prom_close_stdin(void)
1777{
1778 __be32 val;
1779 ihandle stdin;
1780
1781 if (prom_getprop(prom.chosen, "stdin", &val, sizeof(val)) > 0) {
1782 stdin = be32_to_cpu(val);
1783 call_prom("close", 1, 0, stdin);
1784 }
1785}
1786
1787#ifdef CONFIG_PPC_SVM
1788static int prom_rtas_hcall(uint64_t args)
1789{
1790 register uint64_t arg1 asm("r3") = H_RTAS;
1791 register uint64_t arg2 asm("r4") = args;
1792
1793 asm volatile("sc 1\n" : "=r" (arg1) :
1794 "r" (arg1),
1795 "r" (arg2) :);
1796 srr_regs_clobbered();
1797
1798 return arg1;
1799}
1800
1801static struct rtas_args __prombss os_term_args;
1802
1803static void __init prom_rtas_os_term(char *str)
1804{
1805 phandle rtas_node;
1806 __be32 val;
1807 u32 token;
1808
1809 prom_debug("%s: start...\n", __func__);
1810 rtas_node = call_prom("finddevice", 1, 1, ADDR("/rtas"));
1811 prom_debug("rtas_node: %x\n", rtas_node);
1812 if (!PHANDLE_VALID(rtas_node))
1813 return;
1814
1815 val = 0;
1816 prom_getprop(rtas_node, "ibm,os-term", &val, sizeof(val));
1817 token = be32_to_cpu(val);
1818 prom_debug("ibm,os-term: %x\n", token);
1819 if (token == 0)
1820 prom_panic("Could not get token for ibm,os-term\n");
1821 os_term_args.token = cpu_to_be32(token);
1822 os_term_args.nargs = cpu_to_be32(1);
1823 os_term_args.nret = cpu_to_be32(1);
1824 os_term_args.args[0] = cpu_to_be32(__pa(str));
1825 prom_rtas_hcall((uint64_t)&os_term_args);
1826}
1827#endif /* CONFIG_PPC_SVM */
1828
1829/*
1830 * Allocate room for and instantiate RTAS
1831 */
1832static void __init prom_instantiate_rtas(void)
1833{
1834 phandle rtas_node;
1835 ihandle rtas_inst;
1836 u32 base, entry = 0;
1837 __be32 val;
1838 u32 size = 0;
1839
1840 prom_debug("prom_instantiate_rtas: start...\n");
1841
1842 rtas_node = call_prom("finddevice", 1, 1, ADDR("/rtas"));
1843 prom_debug("rtas_node: %x\n", rtas_node);
1844 if (!PHANDLE_VALID(rtas_node))
1845 return;
1846
1847 val = 0;
1848 prom_getprop(rtas_node, "rtas-size", &val, sizeof(size));
1849 size = be32_to_cpu(val);
1850 if (size == 0)
1851 return;
1852
1853 base = alloc_down(size, PAGE_SIZE, 0);
1854 if (base == 0)
1855 prom_panic("Could not allocate memory for RTAS\n");
1856
1857 rtas_inst = call_prom("open", 1, 1, ADDR("/rtas"));
1858 if (!IHANDLE_VALID(rtas_inst)) {
1859 prom_printf("opening rtas package failed (%x)\n", rtas_inst);
1860 return;
1861 }
1862
1863 prom_printf("instantiating rtas at 0x%x...", base);
1864
1865 if (call_prom_ret("call-method", 3, 2, &entry,
1866 ADDR("instantiate-rtas"),
1867 rtas_inst, base) != 0
1868 || entry == 0) {
1869 prom_printf(" failed\n");
1870 return;
1871 }
1872 prom_printf(" done\n");
1873
1874 reserve_mem(base, size);
1875
1876 val = cpu_to_be32(base);
1877 prom_setprop(rtas_node, "/rtas", "linux,rtas-base",
1878 &val, sizeof(val));
1879 val = cpu_to_be32(entry);
1880 prom_setprop(rtas_node, "/rtas", "linux,rtas-entry",
1881 &val, sizeof(val));
1882
1883 /* Check if it supports "query-cpu-stopped-state" */
1884 if (prom_getprop(rtas_node, "query-cpu-stopped-state",
1885 &val, sizeof(val)) != PROM_ERROR)
1886 rtas_has_query_cpu_stopped = true;
1887
1888 prom_debug("rtas base = 0x%x\n", base);
1889 prom_debug("rtas entry = 0x%x\n", entry);
1890 prom_debug("rtas size = 0x%x\n", size);
1891
1892 prom_debug("prom_instantiate_rtas: end...\n");
1893}
1894
1895#ifdef CONFIG_PPC64
1896/*
1897 * Allocate room for and instantiate Stored Measurement Log (SML)
1898 */
1899static void __init prom_instantiate_sml(void)
1900{
1901 phandle ibmvtpm_node;
1902 ihandle ibmvtpm_inst;
1903 u32 entry = 0, size = 0, succ = 0;
1904 u64 base;
1905 __be32 val;
1906
1907 prom_debug("prom_instantiate_sml: start...\n");
1908
1909 ibmvtpm_node = call_prom("finddevice", 1, 1, ADDR("/vdevice/vtpm"));
1910 prom_debug("ibmvtpm_node: %x\n", ibmvtpm_node);
1911 if (!PHANDLE_VALID(ibmvtpm_node))
1912 return;
1913
1914 ibmvtpm_inst = call_prom("open", 1, 1, ADDR("/vdevice/vtpm"));
1915 if (!IHANDLE_VALID(ibmvtpm_inst)) {
1916 prom_printf("opening vtpm package failed (%x)\n", ibmvtpm_inst);
1917 return;
1918 }
1919
1920 if (prom_getprop(ibmvtpm_node, "ibm,sml-efi-reformat-supported",
1921 &val, sizeof(val)) != PROM_ERROR) {
1922 if (call_prom_ret("call-method", 2, 2, &succ,
1923 ADDR("reformat-sml-to-efi-alignment"),
1924 ibmvtpm_inst) != 0 || succ == 0) {
1925 prom_printf("Reformat SML to EFI alignment failed\n");
1926 return;
1927 }
1928
1929 if (call_prom_ret("call-method", 2, 2, &size,
1930 ADDR("sml-get-allocated-size"),
1931 ibmvtpm_inst) != 0 || size == 0) {
1932 prom_printf("SML get allocated size failed\n");
1933 return;
1934 }
1935 } else {
1936 if (call_prom_ret("call-method", 2, 2, &size,
1937 ADDR("sml-get-handover-size"),
1938 ibmvtpm_inst) != 0 || size == 0) {
1939 prom_printf("SML get handover size failed\n");
1940 return;
1941 }
1942 }
1943
1944 base = alloc_down(size, PAGE_SIZE, 0);
1945 if (base == 0)
1946 prom_panic("Could not allocate memory for sml\n");
1947
1948 prom_printf("instantiating sml at 0x%llx...", base);
1949
1950 memset((void *)base, 0, size);
1951
1952 if (call_prom_ret("call-method", 4, 2, &entry,
1953 ADDR("sml-handover"),
1954 ibmvtpm_inst, size, base) != 0 || entry == 0) {
1955 prom_printf("SML handover failed\n");
1956 return;
1957 }
1958 prom_printf(" done\n");
1959
1960 reserve_mem(base, size);
1961
1962 prom_setprop(ibmvtpm_node, "/vdevice/vtpm", "linux,sml-base",
1963 &base, sizeof(base));
1964 prom_setprop(ibmvtpm_node, "/vdevice/vtpm", "linux,sml-size",
1965 &size, sizeof(size));
1966
1967 prom_debug("sml base = 0x%llx\n", base);
1968 prom_debug("sml size = 0x%x\n", size);
1969
1970 prom_debug("prom_instantiate_sml: end...\n");
1971}
1972
1973/*
1974 * Allocate room for and initialize TCE tables
1975 */
1976#ifdef __BIG_ENDIAN__
1977static void __init prom_initialize_tce_table(void)
1978{
1979 phandle node;
1980 ihandle phb_node;
1981 char compatible[64], type[64], model[64];
1982 char *path = prom_scratch;
1983 u64 base, align;
1984 u32 minalign, minsize;
1985 u64 tce_entry, *tce_entryp;
1986 u64 local_alloc_top, local_alloc_bottom;
1987 u64 i;
1988
1989 if (prom_iommu_off)
1990 return;
1991
1992 prom_debug("starting prom_initialize_tce_table\n");
1993
1994 /* Cache current top of allocs so we reserve a single block */
1995 local_alloc_top = alloc_top_high;
1996 local_alloc_bottom = local_alloc_top;
1997
1998 /* Search all nodes looking for PHBs. */
1999 for (node = 0; prom_next_node(&node); ) {
2000 compatible[0] = 0;
2001 type[0] = 0;
2002 model[0] = 0;
2003 prom_getprop(node, "compatible",
2004 compatible, sizeof(compatible));
2005 prom_getprop(node, "device_type", type, sizeof(type));
2006 prom_getprop(node, "model", model, sizeof(model));
2007
2008 if ((type[0] == 0) || (prom_strstr(type, "pci") == NULL))
2009 continue;
2010
2011 /* Keep the old logic intact to avoid regression. */
2012 if (compatible[0] != 0) {
2013 if ((prom_strstr(compatible, "python") == NULL) &&
2014 (prom_strstr(compatible, "Speedwagon") == NULL) &&
2015 (prom_strstr(compatible, "Winnipeg") == NULL))
2016 continue;
2017 } else if (model[0] != 0) {
2018 if ((prom_strstr(model, "ython") == NULL) &&
2019 (prom_strstr(model, "peedwagon") == NULL) &&
2020 (prom_strstr(model, "innipeg") == NULL))
2021 continue;
2022 }
2023
2024 if (prom_getprop(node, "tce-table-minalign", &minalign,
2025 sizeof(minalign)) == PROM_ERROR)
2026 minalign = 0;
2027 if (prom_getprop(node, "tce-table-minsize", &minsize,
2028 sizeof(minsize)) == PROM_ERROR)
2029 minsize = 4UL << 20;
2030
2031 /*
2032 * Even though we read what OF wants, we just set the table
2033 * size to 4 MB. This is enough to map 2GB of PCI DMA space.
2034 * By doing this, we avoid the pitfalls of trying to DMA to
2035 * MMIO space and the DMA alias hole.
2036 */
2037 minsize = 4UL << 20;
2038
2039 /* Align to the greater of the align or size */
2040 align = max(minalign, minsize);
2041 base = alloc_down(minsize, align, 1);
2042 if (base == 0)
2043 prom_panic("ERROR, cannot find space for TCE table.\n");
2044 if (base < local_alloc_bottom)
2045 local_alloc_bottom = base;
2046
2047 /* It seems OF doesn't null-terminate the path :-( */
2048 memset(path, 0, sizeof(prom_scratch));
2049 /* Call OF to setup the TCE hardware */
2050 if (call_prom("package-to-path", 3, 1, node,
2051 path, sizeof(prom_scratch) - 1) == PROM_ERROR) {
2052 prom_printf("package-to-path failed\n");
2053 }
2054
2055 /* Save away the TCE table attributes for later use. */
2056 prom_setprop(node, path, "linux,tce-base", &base, sizeof(base));
2057 prom_setprop(node, path, "linux,tce-size", &minsize, sizeof(minsize));
2058
2059 prom_debug("TCE table: %s\n", path);
2060 prom_debug("\tnode = 0x%x\n", node);
2061 prom_debug("\tbase = 0x%llx\n", base);
2062 prom_debug("\tsize = 0x%x\n", minsize);
2063
2064 /* Initialize the table to have a one-to-one mapping
2065 * over the allocated size.
2066 */
2067 tce_entryp = (u64 *)base;
2068 for (i = 0; i < (minsize >> 3) ;tce_entryp++, i++) {
2069 tce_entry = (i << PAGE_SHIFT);
2070 tce_entry |= 0x3;
2071 *tce_entryp = tce_entry;
2072 }
2073
2074 prom_printf("opening PHB %s", path);
2075 phb_node = call_prom("open", 1, 1, path);
2076 if (phb_node == 0)
2077 prom_printf("... failed\n");
2078 else
2079 prom_printf("... done\n");
2080
2081 call_prom("call-method", 6, 0, ADDR("set-64-bit-addressing"),
2082 phb_node, -1, minsize,
2083 (u32) base, (u32) (base >> 32));
2084 call_prom("close", 1, 0, phb_node);
2085 }
2086
2087 reserve_mem(local_alloc_bottom, local_alloc_top - local_alloc_bottom);
2088
2089 /* These are only really needed if there is a memory limit in
2090 * effect, but we don't know so export them always. */
2091 prom_tce_alloc_start = local_alloc_bottom;
2092 prom_tce_alloc_end = local_alloc_top;
2093
2094 /* Flag the first invalid entry */
2095 prom_debug("ending prom_initialize_tce_table\n");
2096}
2097#endif /* __BIG_ENDIAN__ */
2098#endif /* CONFIG_PPC64 */
2099
2100/*
2101 * With CHRP SMP we need to use the OF to start the other processors.
2102 * We can't wait until smp_boot_cpus (the OF is trashed by then)
2103 * so we have to put the processors into a holding pattern controlled
2104 * by the kernel (not OF) before we destroy the OF.
2105 *
2106 * This uses a chunk of low memory, puts some holding pattern
2107 * code there and sends the other processors off to there until
2108 * smp_boot_cpus tells them to do something. The holding pattern
2109 * checks that address until its cpu # is there, when it is that
2110 * cpu jumps to __secondary_start(). smp_boot_cpus() takes care
2111 * of setting those values.
2112 *
2113 * We also use physical address 0x4 here to tell when a cpu
2114 * is in its holding pattern code.
2115 *
2116 * -- Cort
2117 */
2118/*
2119 * We want to reference the copy of __secondary_hold_* in the
2120 * 0 - 0x100 address range
2121 */
2122#define LOW_ADDR(x) (((unsigned long) &(x)) & 0xff)
2123
2124static void __init prom_hold_cpus(void)
2125{
2126 unsigned long i;
2127 phandle node;
2128 char type[64];
2129 unsigned long *spinloop
2130 = (void *) LOW_ADDR(__secondary_hold_spinloop);
2131 unsigned long *acknowledge
2132 = (void *) LOW_ADDR(__secondary_hold_acknowledge);
2133 unsigned long secondary_hold = LOW_ADDR(__secondary_hold);
2134
2135 /*
2136 * On pseries, if RTAS supports "query-cpu-stopped-state",
2137 * we skip this stage, the CPUs will be started by the
2138 * kernel using RTAS.
2139 */
2140 if ((of_platform == PLATFORM_PSERIES ||
2141 of_platform == PLATFORM_PSERIES_LPAR) &&
2142 rtas_has_query_cpu_stopped) {
2143 prom_printf("prom_hold_cpus: skipped\n");
2144 return;
2145 }
2146
2147 prom_debug("prom_hold_cpus: start...\n");
2148 prom_debug(" 1) spinloop = 0x%lx\n", (unsigned long)spinloop);
2149 prom_debug(" 1) *spinloop = 0x%lx\n", *spinloop);
2150 prom_debug(" 1) acknowledge = 0x%lx\n",
2151 (unsigned long)acknowledge);
2152 prom_debug(" 1) *acknowledge = 0x%lx\n", *acknowledge);
2153 prom_debug(" 1) secondary_hold = 0x%lx\n", secondary_hold);
2154
2155 /* Set the common spinloop variable, so all of the secondary cpus
2156 * will block when they are awakened from their OF spinloop.
2157 * This must occur for both SMP and non SMP kernels, since OF will
2158 * be trashed when we move the kernel.
2159 */
2160 *spinloop = 0;
2161
2162 /* look for cpus */
2163 for (node = 0; prom_next_node(&node); ) {
2164 unsigned int cpu_no;
2165 __be32 reg;
2166
2167 type[0] = 0;
2168 prom_getprop(node, "device_type", type, sizeof(type));
2169 if (prom_strcmp(type, "cpu") != 0)
2170 continue;
2171
2172 /* Skip non-configured cpus. */
2173 if (prom_getprop(node, "status", type, sizeof(type)) > 0)
2174 if (prom_strcmp(type, "okay") != 0)
2175 continue;
2176
2177 reg = cpu_to_be32(-1); /* make sparse happy */
2178 prom_getprop(node, "reg", ®, sizeof(reg));
2179 cpu_no = be32_to_cpu(reg);
2180
2181 prom_debug("cpu hw idx = %u\n", cpu_no);
2182
2183 /* Init the acknowledge var which will be reset by
2184 * the secondary cpu when it awakens from its OF
2185 * spinloop.
2186 */
2187 *acknowledge = (unsigned long)-1;
2188
2189 if (cpu_no != prom.cpu) {
2190 /* Primary Thread of non-boot cpu or any thread */
2191 prom_printf("starting cpu hw idx %u... ", cpu_no);
2192 call_prom("start-cpu", 3, 0, node,
2193 secondary_hold, cpu_no);
2194
2195 for (i = 0; (i < 100000000) &&
2196 (*acknowledge == ((unsigned long)-1)); i++ )
2197 mb();
2198
2199 if (*acknowledge == cpu_no)
2200 prom_printf("done\n");
2201 else
2202 prom_printf("failed: %lx\n", *acknowledge);
2203 }
2204#ifdef CONFIG_SMP
2205 else
2206 prom_printf("boot cpu hw idx %u\n", cpu_no);
2207#endif /* CONFIG_SMP */
2208 }
2209
2210 prom_debug("prom_hold_cpus: end...\n");
2211}
2212
2213
2214static void __init prom_init_client_services(unsigned long pp)
2215{
2216 /* Get a handle to the prom entry point before anything else */
2217 prom_entry = pp;
2218
2219 /* get a handle for the stdout device */
2220 prom.chosen = call_prom("finddevice", 1, 1, ADDR("/chosen"));
2221 if (!PHANDLE_VALID(prom.chosen))
2222 prom_panic("cannot find chosen"); /* msg won't be printed :( */
2223
2224 /* get device tree root */
2225 prom.root = call_prom("finddevice", 1, 1, ADDR("/"));
2226 if (!PHANDLE_VALID(prom.root))
2227 prom_panic("cannot find device tree root"); /* msg won't be printed :( */
2228
2229 prom.mmumap = 0;
2230}
2231
2232#ifdef CONFIG_PPC32
2233/*
2234 * For really old powermacs, we need to map things we claim.
2235 * For that, we need the ihandle of the mmu.
2236 * Also, on the longtrail, we need to work around other bugs.
2237 */
2238static void __init prom_find_mmu(void)
2239{
2240 phandle oprom;
2241 char version[64];
2242
2243 oprom = call_prom("finddevice", 1, 1, ADDR("/openprom"));
2244 if (!PHANDLE_VALID(oprom))
2245 return;
2246 if (prom_getprop(oprom, "model", version, sizeof(version)) <= 0)
2247 return;
2248 version[sizeof(version) - 1] = 0;
2249 /* XXX might need to add other versions here */
2250 if (prom_strcmp(version, "Open Firmware, 1.0.5") == 0)
2251 of_workarounds = OF_WA_CLAIM;
2252 else if (prom_strncmp(version, "FirmWorks,3.", 12) == 0) {
2253 of_workarounds = OF_WA_CLAIM | OF_WA_LONGTRAIL;
2254 call_prom("interpret", 1, 1, "dev /memory 0 to allow-reclaim");
2255 } else
2256 return;
2257 prom.memory = call_prom("open", 1, 1, ADDR("/memory"));
2258 prom_getprop(prom.chosen, "mmu", &prom.mmumap,
2259 sizeof(prom.mmumap));
2260 prom.mmumap = be32_to_cpu(prom.mmumap);
2261 if (!IHANDLE_VALID(prom.memory) || !IHANDLE_VALID(prom.mmumap))
2262 of_workarounds &= ~OF_WA_CLAIM; /* hmmm */
2263}
2264#else
2265#define prom_find_mmu()
2266#endif
2267
2268static void __init prom_init_stdout(void)
2269{
2270 char *path = of_stdout_device;
2271 char type[16];
2272 phandle stdout_node;
2273 __be32 val;
2274
2275 if (prom_getprop(prom.chosen, "stdout", &val, sizeof(val)) <= 0)
2276 prom_panic("cannot find stdout");
2277
2278 prom.stdout = be32_to_cpu(val);
2279
2280 /* Get the full OF pathname of the stdout device */
2281 memset(path, 0, 256);
2282 call_prom("instance-to-path", 3, 1, prom.stdout, path, 255);
2283 prom_printf("OF stdout device is: %s\n", of_stdout_device);
2284 prom_setprop(prom.chosen, "/chosen", "linux,stdout-path",
2285 path, prom_strlen(path) + 1);
2286
2287 /* instance-to-package fails on PA-Semi */
2288 stdout_node = call_prom("instance-to-package", 1, 1, prom.stdout);
2289 if (stdout_node != PROM_ERROR) {
2290 val = cpu_to_be32(stdout_node);
2291
2292 /* If it's a display, note it */
2293 memset(type, 0, sizeof(type));
2294 prom_getprop(stdout_node, "device_type", type, sizeof(type));
2295 if (prom_strcmp(type, "display") == 0)
2296 prom_setprop(stdout_node, path, "linux,boot-display", NULL, 0);
2297 }
2298}
2299
2300static int __init prom_find_machine_type(void)
2301{
2302 char compat[256];
2303 int len, i = 0;
2304#ifdef CONFIG_PPC64
2305 phandle rtas;
2306 int x;
2307#endif
2308
2309 /* Look for a PowerMac or a Cell */
2310 len = prom_getprop(prom.root, "compatible",
2311 compat, sizeof(compat)-1);
2312 if (len > 0) {
2313 compat[len] = 0;
2314 while (i < len) {
2315 char *p = &compat[i];
2316 int sl = prom_strlen(p);
2317 if (sl == 0)
2318 break;
2319 if (prom_strstr(p, "Power Macintosh") ||
2320 prom_strstr(p, "MacRISC"))
2321 return PLATFORM_POWERMAC;
2322#ifdef CONFIG_PPC64
2323 /* We must make sure we don't detect the IBM Cell
2324 * blades as pSeries due to some firmware issues,
2325 * so we do it here.
2326 */
2327 if (prom_strstr(p, "IBM,CBEA") ||
2328 prom_strstr(p, "IBM,CPBW-1.0"))
2329 return PLATFORM_GENERIC;
2330#endif /* CONFIG_PPC64 */
2331 i += sl + 1;
2332 }
2333 }
2334#ifdef CONFIG_PPC64
2335 /* Try to figure out if it's an IBM pSeries or any other
2336 * PAPR compliant platform. We assume it is if :
2337 * - /device_type is "chrp" (please, do NOT use that for future
2338 * non-IBM designs !
2339 * - it has /rtas
2340 */
2341 len = prom_getprop(prom.root, "device_type",
2342 compat, sizeof(compat)-1);
2343 if (len <= 0)
2344 return PLATFORM_GENERIC;
2345 if (prom_strcmp(compat, "chrp"))
2346 return PLATFORM_GENERIC;
2347
2348 /* Default to pSeries. We need to know if we are running LPAR */
2349 rtas = call_prom("finddevice", 1, 1, ADDR("/rtas"));
2350 if (!PHANDLE_VALID(rtas))
2351 return PLATFORM_GENERIC;
2352 x = prom_getproplen(rtas, "ibm,hypertas-functions");
2353 if (x != PROM_ERROR) {
2354 prom_debug("Hypertas detected, assuming LPAR !\n");
2355 return PLATFORM_PSERIES_LPAR;
2356 }
2357 return PLATFORM_PSERIES;
2358#else
2359 return PLATFORM_GENERIC;
2360#endif
2361}
2362
2363static int __init prom_set_color(ihandle ih, int i, int r, int g, int b)
2364{
2365 return call_prom("call-method", 6, 1, ADDR("color!"), ih, i, b, g, r);
2366}
2367
2368/*
2369 * If we have a display that we don't know how to drive,
2370 * we will want to try to execute OF's open method for it
2371 * later. However, OF will probably fall over if we do that
2372 * we've taken over the MMU.
2373 * So we check whether we will need to open the display,
2374 * and if so, open it now.
2375 */
2376static void __init prom_check_displays(void)
2377{
2378 char type[16], *path;
2379 phandle node;
2380 ihandle ih;
2381 int i;
2382
2383 static const unsigned char default_colors[] __initconst = {
2384 0x00, 0x00, 0x00,
2385 0x00, 0x00, 0xaa,
2386 0x00, 0xaa, 0x00,
2387 0x00, 0xaa, 0xaa,
2388 0xaa, 0x00, 0x00,
2389 0xaa, 0x00, 0xaa,
2390 0xaa, 0xaa, 0x00,
2391 0xaa, 0xaa, 0xaa,
2392 0x55, 0x55, 0x55,
2393 0x55, 0x55, 0xff,
2394 0x55, 0xff, 0x55,
2395 0x55, 0xff, 0xff,
2396 0xff, 0x55, 0x55,
2397 0xff, 0x55, 0xff,
2398 0xff, 0xff, 0x55,
2399 0xff, 0xff, 0xff
2400 };
2401 const unsigned char *clut;
2402
2403 prom_debug("Looking for displays\n");
2404 for (node = 0; prom_next_node(&node); ) {
2405 memset(type, 0, sizeof(type));
2406 prom_getprop(node, "device_type", type, sizeof(type));
2407 if (prom_strcmp(type, "display") != 0)
2408 continue;
2409
2410 /* It seems OF doesn't null-terminate the path :-( */
2411 path = prom_scratch;
2412 memset(path, 0, sizeof(prom_scratch));
2413
2414 /*
2415 * leave some room at the end of the path for appending extra
2416 * arguments
2417 */
2418 if (call_prom("package-to-path", 3, 1, node, path,
2419 sizeof(prom_scratch) - 10) == PROM_ERROR)
2420 continue;
2421 prom_printf("found display : %s, opening... ", path);
2422
2423 ih = call_prom("open", 1, 1, path);
2424 if (ih == 0) {
2425 prom_printf("failed\n");
2426 continue;
2427 }
2428
2429 /* Success */
2430 prom_printf("done\n");
2431 prom_setprop(node, path, "linux,opened", NULL, 0);
2432
2433 /* Setup a usable color table when the appropriate
2434 * method is available. Should update this to set-colors */
2435 clut = default_colors;
2436 for (i = 0; i < 16; i++, clut += 3)
2437 if (prom_set_color(ih, i, clut[0], clut[1],
2438 clut[2]) != 0)
2439 break;
2440
2441#ifdef CONFIG_LOGO_LINUX_CLUT224
2442 clut = PTRRELOC(logo_linux_clut224.clut);
2443 for (i = 0; i < logo_linux_clut224.clutsize; i++, clut += 3)
2444 if (prom_set_color(ih, i + 32, clut[0], clut[1],
2445 clut[2]) != 0)
2446 break;
2447#endif /* CONFIG_LOGO_LINUX_CLUT224 */
2448
2449#ifdef CONFIG_PPC_EARLY_DEBUG_BOOTX
2450 if (prom_getprop(node, "linux,boot-display", NULL, 0) !=
2451 PROM_ERROR) {
2452 u32 width, height, pitch, addr;
2453
2454 prom_printf("Setting btext !\n");
2455
2456 if (prom_getprop(node, "width", &width, 4) == PROM_ERROR)
2457 return;
2458
2459 if (prom_getprop(node, "height", &height, 4) == PROM_ERROR)
2460 return;
2461
2462 if (prom_getprop(node, "linebytes", &pitch, 4) == PROM_ERROR)
2463 return;
2464
2465 if (prom_getprop(node, "address", &addr, 4) == PROM_ERROR)
2466 return;
2467
2468 prom_printf("W=%d H=%d LB=%d addr=0x%x\n",
2469 width, height, pitch, addr);
2470 btext_setup_display(width, height, 8, pitch, addr);
2471 btext_prepare_BAT();
2472 }
2473#endif /* CONFIG_PPC_EARLY_DEBUG_BOOTX */
2474 }
2475}
2476
2477
2478/* Return (relocated) pointer to this much memory: moves initrd if reqd. */
2479static void __init *make_room(unsigned long *mem_start, unsigned long *mem_end,
2480 unsigned long needed, unsigned long align)
2481{
2482 void *ret;
2483
2484 *mem_start = ALIGN(*mem_start, align);
2485 while ((*mem_start + needed) > *mem_end) {
2486 unsigned long room, chunk;
2487
2488 prom_debug("Chunk exhausted, claiming more at %lx...\n",
2489 alloc_bottom);
2490 room = alloc_top - alloc_bottom;
2491 if (room > DEVTREE_CHUNK_SIZE)
2492 room = DEVTREE_CHUNK_SIZE;
2493 if (room < PAGE_SIZE)
2494 prom_panic("No memory for flatten_device_tree "
2495 "(no room)\n");
2496 chunk = alloc_up(room, 0);
2497 if (chunk == 0)
2498 prom_panic("No memory for flatten_device_tree "
2499 "(claim failed)\n");
2500 *mem_end = chunk + room;
2501 }
2502
2503 ret = (void *)*mem_start;
2504 *mem_start += needed;
2505
2506 return ret;
2507}
2508
2509#define dt_push_token(token, mem_start, mem_end) do { \
2510 void *room = make_room(mem_start, mem_end, 4, 4); \
2511 *(__be32 *)room = cpu_to_be32(token); \
2512 } while(0)
2513
2514static unsigned long __init dt_find_string(char *str)
2515{
2516 char *s, *os;
2517
2518 s = os = (char *)dt_string_start;
2519 s += 4;
2520 while (s < (char *)dt_string_end) {
2521 if (prom_strcmp(s, str) == 0)
2522 return s - os;
2523 s += prom_strlen(s) + 1;
2524 }
2525 return 0;
2526}
2527
2528/*
2529 * The Open Firmware 1275 specification states properties must be 31 bytes or
2530 * less, however not all firmwares obey this. Make it 64 bytes to be safe.
2531 */
2532#define MAX_PROPERTY_NAME 64
2533
2534static void __init scan_dt_build_strings(phandle node,
2535 unsigned long *mem_start,
2536 unsigned long *mem_end)
2537{
2538 char *prev_name, *namep, *sstart;
2539 unsigned long soff;
2540 phandle child;
2541
2542 sstart = (char *)dt_string_start;
2543
2544 /* get and store all property names */
2545 prev_name = "";
2546 for (;;) {
2547 /* 64 is max len of name including nul. */
2548 namep = make_room(mem_start, mem_end, MAX_PROPERTY_NAME, 1);
2549 if (call_prom("nextprop", 3, 1, node, prev_name, namep) != 1) {
2550 /* No more nodes: unwind alloc */
2551 *mem_start = (unsigned long)namep;
2552 break;
2553 }
2554
2555 /* skip "name" */
2556 if (prom_strcmp(namep, "name") == 0) {
2557 *mem_start = (unsigned long)namep;
2558 prev_name = "name";
2559 continue;
2560 }
2561 /* get/create string entry */
2562 soff = dt_find_string(namep);
2563 if (soff != 0) {
2564 *mem_start = (unsigned long)namep;
2565 namep = sstart + soff;
2566 } else {
2567 /* Trim off some if we can */
2568 *mem_start = (unsigned long)namep + prom_strlen(namep) + 1;
2569 dt_string_end = *mem_start;
2570 }
2571 prev_name = namep;
2572 }
2573
2574 /* do all our children */
2575 child = call_prom("child", 1, 1, node);
2576 while (child != 0) {
2577 scan_dt_build_strings(child, mem_start, mem_end);
2578 child = call_prom("peer", 1, 1, child);
2579 }
2580}
2581
2582static void __init scan_dt_build_struct(phandle node, unsigned long *mem_start,
2583 unsigned long *mem_end)
2584{
2585 phandle child;
2586 char *namep, *prev_name, *sstart, *p, *ep, *lp, *path;
2587 unsigned long soff;
2588 unsigned char *valp;
2589 static char pname[MAX_PROPERTY_NAME] __prombss;
2590 int l, room, has_phandle = 0;
2591
2592 dt_push_token(OF_DT_BEGIN_NODE, mem_start, mem_end);
2593
2594 /* get the node's full name */
2595 namep = (char *)*mem_start;
2596 room = *mem_end - *mem_start;
2597 if (room > 255)
2598 room = 255;
2599 l = call_prom("package-to-path", 3, 1, node, namep, room);
2600 if (l >= 0) {
2601 /* Didn't fit? Get more room. */
2602 if (l >= room) {
2603 if (l >= *mem_end - *mem_start)
2604 namep = make_room(mem_start, mem_end, l+1, 1);
2605 call_prom("package-to-path", 3, 1, node, namep, l);
2606 }
2607 namep[l] = '\0';
2608
2609 /* Fixup an Apple bug where they have bogus \0 chars in the
2610 * middle of the path in some properties, and extract
2611 * the unit name (everything after the last '/').
2612 */
2613 for (lp = p = namep, ep = namep + l; p < ep; p++) {
2614 if (*p == '/')
2615 lp = namep;
2616 else if (*p != 0)
2617 *lp++ = *p;
2618 }
2619 *lp = 0;
2620 *mem_start = ALIGN((unsigned long)lp + 1, 4);
2621 }
2622
2623 /* get it again for debugging */
2624 path = prom_scratch;
2625 memset(path, 0, sizeof(prom_scratch));
2626 call_prom("package-to-path", 3, 1, node, path, sizeof(prom_scratch) - 1);
2627
2628 /* get and store all properties */
2629 prev_name = "";
2630 sstart = (char *)dt_string_start;
2631 for (;;) {
2632 if (call_prom("nextprop", 3, 1, node, prev_name,
2633 pname) != 1)
2634 break;
2635
2636 /* skip "name" */
2637 if (prom_strcmp(pname, "name") == 0) {
2638 prev_name = "name";
2639 continue;
2640 }
2641
2642 /* find string offset */
2643 soff = dt_find_string(pname);
2644 if (soff == 0) {
2645 prom_printf("WARNING: Can't find string index for"
2646 " <%s>, node %s\n", pname, path);
2647 break;
2648 }
2649 prev_name = sstart + soff;
2650
2651 /* get length */
2652 l = call_prom("getproplen", 2, 1, node, pname);
2653
2654 /* sanity checks */
2655 if (l == PROM_ERROR)
2656 continue;
2657
2658 /* push property head */
2659 dt_push_token(OF_DT_PROP, mem_start, mem_end);
2660 dt_push_token(l, mem_start, mem_end);
2661 dt_push_token(soff, mem_start, mem_end);
2662
2663 /* push property content */
2664 valp = make_room(mem_start, mem_end, l, 4);
2665 call_prom("getprop", 4, 1, node, pname, valp, l);
2666 *mem_start = ALIGN(*mem_start, 4);
2667
2668 if (!prom_strcmp(pname, "phandle"))
2669 has_phandle = 1;
2670 }
2671
2672 /* Add a "phandle" property if none already exist */
2673 if (!has_phandle) {
2674 soff = dt_find_string("phandle");
2675 if (soff == 0)
2676 prom_printf("WARNING: Can't find string index for <phandle> node %s\n", path);
2677 else {
2678 dt_push_token(OF_DT_PROP, mem_start, mem_end);
2679 dt_push_token(4, mem_start, mem_end);
2680 dt_push_token(soff, mem_start, mem_end);
2681 valp = make_room(mem_start, mem_end, 4, 4);
2682 *(__be32 *)valp = cpu_to_be32(node);
2683 }
2684 }
2685
2686 /* do all our children */
2687 child = call_prom("child", 1, 1, node);
2688 while (child != 0) {
2689 scan_dt_build_struct(child, mem_start, mem_end);
2690 child = call_prom("peer", 1, 1, child);
2691 }
2692
2693 dt_push_token(OF_DT_END_NODE, mem_start, mem_end);
2694}
2695
2696static void __init flatten_device_tree(void)
2697{
2698 phandle root;
2699 unsigned long mem_start, mem_end, room;
2700 struct boot_param_header *hdr;
2701 char *namep;
2702 u64 *rsvmap;
2703
2704 /*
2705 * Check how much room we have between alloc top & bottom (+/- a
2706 * few pages), crop to 1MB, as this is our "chunk" size
2707 */
2708 room = alloc_top - alloc_bottom - 0x4000;
2709 if (room > DEVTREE_CHUNK_SIZE)
2710 room = DEVTREE_CHUNK_SIZE;
2711 prom_debug("starting device tree allocs at %lx\n", alloc_bottom);
2712
2713 /* Now try to claim that */
2714 mem_start = (unsigned long)alloc_up(room, PAGE_SIZE);
2715 if (mem_start == 0)
2716 prom_panic("Can't allocate initial device-tree chunk\n");
2717 mem_end = mem_start + room;
2718
2719 /* Get root of tree */
2720 root = call_prom("peer", 1, 1, (phandle)0);
2721 if (root == (phandle)0)
2722 prom_panic ("couldn't get device tree root\n");
2723
2724 /* Build header and make room for mem rsv map */
2725 mem_start = ALIGN(mem_start, 4);
2726 hdr = make_room(&mem_start, &mem_end,
2727 sizeof(struct boot_param_header), 4);
2728 dt_header_start = (unsigned long)hdr;
2729 rsvmap = make_room(&mem_start, &mem_end, sizeof(mem_reserve_map), 8);
2730
2731 /* Start of strings */
2732 mem_start = PAGE_ALIGN(mem_start);
2733 dt_string_start = mem_start;
2734 mem_start += 4; /* hole */
2735
2736 /* Add "phandle" in there, we'll need it */
2737 namep = make_room(&mem_start, &mem_end, 16, 1);
2738 prom_strscpy_pad(namep, "phandle", sizeof("phandle"));
2739 mem_start = (unsigned long)namep + prom_strlen(namep) + 1;
2740
2741 /* Build string array */
2742 prom_printf("Building dt strings...\n");
2743 scan_dt_build_strings(root, &mem_start, &mem_end);
2744 dt_string_end = mem_start;
2745
2746 /* Build structure */
2747 mem_start = PAGE_ALIGN(mem_start);
2748 dt_struct_start = mem_start;
2749 prom_printf("Building dt structure...\n");
2750 scan_dt_build_struct(root, &mem_start, &mem_end);
2751 dt_push_token(OF_DT_END, &mem_start, &mem_end);
2752 dt_struct_end = PAGE_ALIGN(mem_start);
2753
2754 /* Finish header */
2755 hdr->boot_cpuid_phys = cpu_to_be32(prom.cpu);
2756 hdr->magic = cpu_to_be32(OF_DT_HEADER);
2757 hdr->totalsize = cpu_to_be32(dt_struct_end - dt_header_start);
2758 hdr->off_dt_struct = cpu_to_be32(dt_struct_start - dt_header_start);
2759 hdr->off_dt_strings = cpu_to_be32(dt_string_start - dt_header_start);
2760 hdr->dt_strings_size = cpu_to_be32(dt_string_end - dt_string_start);
2761 hdr->off_mem_rsvmap = cpu_to_be32(((unsigned long)rsvmap) - dt_header_start);
2762 hdr->version = cpu_to_be32(OF_DT_VERSION);
2763 /* Version 16 is not backward compatible */
2764 hdr->last_comp_version = cpu_to_be32(0x10);
2765
2766 /* Copy the reserve map in */
2767 memcpy(rsvmap, mem_reserve_map, sizeof(mem_reserve_map));
2768
2769#ifdef DEBUG_PROM
2770 {
2771 int i;
2772 prom_printf("reserved memory map:\n");
2773 for (i = 0; i < mem_reserve_cnt; i++)
2774 prom_printf(" %llx - %llx\n",
2775 be64_to_cpu(mem_reserve_map[i].base),
2776 be64_to_cpu(mem_reserve_map[i].size));
2777 }
2778#endif
2779 /* Bump mem_reserve_cnt to cause further reservations to fail
2780 * since it's too late.
2781 */
2782 mem_reserve_cnt = MEM_RESERVE_MAP_SIZE;
2783
2784 prom_printf("Device tree strings 0x%lx -> 0x%lx\n",
2785 dt_string_start, dt_string_end);
2786 prom_printf("Device tree struct 0x%lx -> 0x%lx\n",
2787 dt_struct_start, dt_struct_end);
2788}
2789
2790#ifdef CONFIG_PPC_MAPLE
2791/* PIBS Version 1.05.0000 04/26/2005 has an incorrect /ht/isa/ranges property.
2792 * The values are bad, and it doesn't even have the right number of cells. */
2793static void __init fixup_device_tree_maple(void)
2794{
2795 phandle isa;
2796 u32 rloc = 0x01002000; /* IO space; PCI device = 4 */
2797 u32 isa_ranges[6];
2798 char *name;
2799
2800 name = "/ht@0/isa@4";
2801 isa = call_prom("finddevice", 1, 1, ADDR(name));
2802 if (!PHANDLE_VALID(isa)) {
2803 name = "/ht@0/isa@6";
2804 isa = call_prom("finddevice", 1, 1, ADDR(name));
2805 rloc = 0x01003000; /* IO space; PCI device = 6 */
2806 }
2807 if (!PHANDLE_VALID(isa))
2808 return;
2809
2810 if (prom_getproplen(isa, "ranges") != 12)
2811 return;
2812 if (prom_getprop(isa, "ranges", isa_ranges, sizeof(isa_ranges))
2813 == PROM_ERROR)
2814 return;
2815
2816 if (isa_ranges[0] != 0x1 ||
2817 isa_ranges[1] != 0xf4000000 ||
2818 isa_ranges[2] != 0x00010000)
2819 return;
2820
2821 prom_printf("Fixing up bogus ISA range on Maple/Apache...\n");
2822
2823 isa_ranges[0] = 0x1;
2824 isa_ranges[1] = 0x0;
2825 isa_ranges[2] = rloc;
2826 isa_ranges[3] = 0x0;
2827 isa_ranges[4] = 0x0;
2828 isa_ranges[5] = 0x00010000;
2829 prom_setprop(isa, name, "ranges",
2830 isa_ranges, sizeof(isa_ranges));
2831}
2832
2833#define CPC925_MC_START 0xf8000000
2834#define CPC925_MC_LENGTH 0x1000000
2835/* The values for memory-controller don't have right number of cells */
2836static void __init fixup_device_tree_maple_memory_controller(void)
2837{
2838 phandle mc;
2839 u32 mc_reg[4];
2840 char *name = "/hostbridge@f8000000";
2841 u32 ac, sc;
2842
2843 mc = call_prom("finddevice", 1, 1, ADDR(name));
2844 if (!PHANDLE_VALID(mc))
2845 return;
2846
2847 if (prom_getproplen(mc, "reg") != 8)
2848 return;
2849
2850 prom_getprop(prom.root, "#address-cells", &ac, sizeof(ac));
2851 prom_getprop(prom.root, "#size-cells", &sc, sizeof(sc));
2852 if ((ac != 2) || (sc != 2))
2853 return;
2854
2855 if (prom_getprop(mc, "reg", mc_reg, sizeof(mc_reg)) == PROM_ERROR)
2856 return;
2857
2858 if (mc_reg[0] != CPC925_MC_START || mc_reg[1] != CPC925_MC_LENGTH)
2859 return;
2860
2861 prom_printf("Fixing up bogus hostbridge on Maple...\n");
2862
2863 mc_reg[0] = 0x0;
2864 mc_reg[1] = CPC925_MC_START;
2865 mc_reg[2] = 0x0;
2866 mc_reg[3] = CPC925_MC_LENGTH;
2867 prom_setprop(mc, name, "reg", mc_reg, sizeof(mc_reg));
2868}
2869#else
2870#define fixup_device_tree_maple()
2871#define fixup_device_tree_maple_memory_controller()
2872#endif
2873
2874#ifdef CONFIG_PPC_CHRP
2875/*
2876 * Pegasos and BriQ lacks the "ranges" property in the isa node
2877 * Pegasos needs decimal IRQ 14/15, not hexadecimal
2878 * Pegasos has the IDE configured in legacy mode, but advertised as native
2879 */
2880static void __init fixup_device_tree_chrp(void)
2881{
2882 phandle ph;
2883 u32 prop[6];
2884 u32 rloc = 0x01006000; /* IO space; PCI device = 12 */
2885 char *name;
2886 int rc;
2887
2888 name = "/pci@80000000/isa@c";
2889 ph = call_prom("finddevice", 1, 1, ADDR(name));
2890 if (!PHANDLE_VALID(ph)) {
2891 name = "/pci@ff500000/isa@6";
2892 ph = call_prom("finddevice", 1, 1, ADDR(name));
2893 rloc = 0x01003000; /* IO space; PCI device = 6 */
2894 }
2895 if (PHANDLE_VALID(ph)) {
2896 rc = prom_getproplen(ph, "ranges");
2897 if (rc == 0 || rc == PROM_ERROR) {
2898 prom_printf("Fixing up missing ISA range on Pegasos...\n");
2899
2900 prop[0] = 0x1;
2901 prop[1] = 0x0;
2902 prop[2] = rloc;
2903 prop[3] = 0x0;
2904 prop[4] = 0x0;
2905 prop[5] = 0x00010000;
2906 prom_setprop(ph, name, "ranges", prop, sizeof(prop));
2907 }
2908 }
2909
2910 name = "/pci@80000000/ide@C,1";
2911 ph = call_prom("finddevice", 1, 1, ADDR(name));
2912 if (PHANDLE_VALID(ph)) {
2913 prom_printf("Fixing up IDE interrupt on Pegasos...\n");
2914 prop[0] = 14;
2915 prop[1] = 0x0;
2916 prom_setprop(ph, name, "interrupts", prop, 2*sizeof(u32));
2917 prom_printf("Fixing up IDE class-code on Pegasos...\n");
2918 rc = prom_getprop(ph, "class-code", prop, sizeof(u32));
2919 if (rc == sizeof(u32)) {
2920 prop[0] &= ~0x5;
2921 prom_setprop(ph, name, "class-code", prop, sizeof(u32));
2922 }
2923 }
2924}
2925#else
2926#define fixup_device_tree_chrp()
2927#endif
2928
2929#if defined(CONFIG_PPC64) && defined(CONFIG_PPC_PMAC)
2930static void __init fixup_device_tree_pmac(void)
2931{
2932 phandle u3, i2c, mpic;
2933 u32 u3_rev;
2934 u32 interrupts[2];
2935 u32 parent;
2936
2937 /* Some G5s have a missing interrupt definition, fix it up here */
2938 u3 = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000"));
2939 if (!PHANDLE_VALID(u3))
2940 return;
2941 i2c = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/i2c@f8001000"));
2942 if (!PHANDLE_VALID(i2c))
2943 return;
2944 mpic = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/mpic@f8040000"));
2945 if (!PHANDLE_VALID(mpic))
2946 return;
2947
2948 /* check if proper rev of u3 */
2949 if (prom_getprop(u3, "device-rev", &u3_rev, sizeof(u3_rev))
2950 == PROM_ERROR)
2951 return;
2952 if (u3_rev < 0x35 || u3_rev > 0x39)
2953 return;
2954 /* does it need fixup ? */
2955 if (prom_getproplen(i2c, "interrupts") > 0)
2956 return;
2957
2958 prom_printf("fixing up bogus interrupts for u3 i2c...\n");
2959
2960 /* interrupt on this revision of u3 is number 0 and level */
2961 interrupts[0] = 0;
2962 interrupts[1] = 1;
2963 prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupts",
2964 &interrupts, sizeof(interrupts));
2965 parent = (u32)mpic;
2966 prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupt-parent",
2967 &parent, sizeof(parent));
2968}
2969#else
2970#define fixup_device_tree_pmac()
2971#endif
2972
2973#ifdef CONFIG_PPC_EFIKA
2974/*
2975 * The MPC5200 FEC driver requires an phy-handle property to tell it how
2976 * to talk to the phy. If the phy-handle property is missing, then this
2977 * function is called to add the appropriate nodes and link it to the
2978 * ethernet node.
2979 */
2980static void __init fixup_device_tree_efika_add_phy(void)
2981{
2982 u32 node;
2983 char prop[64];
2984 int rv;
2985
2986 /* Check if /builtin/ethernet exists - bail if it doesn't */
2987 node = call_prom("finddevice", 1, 1, ADDR("/builtin/ethernet"));
2988 if (!PHANDLE_VALID(node))
2989 return;
2990
2991 /* Check if the phy-handle property exists - bail if it does */
2992 rv = prom_getprop(node, "phy-handle", prop, sizeof(prop));
2993 if (!rv)
2994 return;
2995
2996 /*
2997 * At this point the ethernet device doesn't have a phy described.
2998 * Now we need to add the missing phy node and linkage
2999 */
3000
3001 /* Check for an MDIO bus node - if missing then create one */
3002 node = call_prom("finddevice", 1, 1, ADDR("/builtin/mdio"));
3003 if (!PHANDLE_VALID(node)) {
3004 prom_printf("Adding Ethernet MDIO node\n");
3005 call_prom("interpret", 1, 1,
3006 " s\" /builtin\" find-device"
3007 " new-device"
3008 " 1 encode-int s\" #address-cells\" property"
3009 " 0 encode-int s\" #size-cells\" property"
3010 " s\" mdio\" device-name"
3011 " s\" fsl,mpc5200b-mdio\" encode-string"
3012 " s\" compatible\" property"
3013 " 0xf0003000 0x400 reg"
3014 " 0x2 encode-int"
3015 " 0x5 encode-int encode+"
3016 " 0x3 encode-int encode+"
3017 " s\" interrupts\" property"
3018 " finish-device");
3019 }
3020
3021 /* Check for a PHY device node - if missing then create one and
3022 * give it's phandle to the ethernet node */
3023 node = call_prom("finddevice", 1, 1,
3024 ADDR("/builtin/mdio/ethernet-phy"));
3025 if (!PHANDLE_VALID(node)) {
3026 prom_printf("Adding Ethernet PHY node\n");
3027 call_prom("interpret", 1, 1,
3028 " s\" /builtin/mdio\" find-device"
3029 " new-device"
3030 " s\" ethernet-phy\" device-name"
3031 " 0x10 encode-int s\" reg\" property"
3032 " my-self"
3033 " ihandle>phandle"
3034 " finish-device"
3035 " s\" /builtin/ethernet\" find-device"
3036 " encode-int"
3037 " s\" phy-handle\" property"
3038 " device-end");
3039 }
3040}
3041
3042static void __init fixup_device_tree_efika(void)
3043{
3044 int sound_irq[3] = { 2, 2, 0 };
3045 int bcomm_irq[3*16] = { 3,0,0, 3,1,0, 3,2,0, 3,3,0,
3046 3,4,0, 3,5,0, 3,6,0, 3,7,0,
3047 3,8,0, 3,9,0, 3,10,0, 3,11,0,
3048 3,12,0, 3,13,0, 3,14,0, 3,15,0 };
3049 u32 node;
3050 char prop[64];
3051 int rv, len;
3052
3053 /* Check if we're really running on a EFIKA */
3054 node = call_prom("finddevice", 1, 1, ADDR("/"));
3055 if (!PHANDLE_VALID(node))
3056 return;
3057
3058 rv = prom_getprop(node, "model", prop, sizeof(prop));
3059 if (rv == PROM_ERROR)
3060 return;
3061 if (prom_strcmp(prop, "EFIKA5K2"))
3062 return;
3063
3064 prom_printf("Applying EFIKA device tree fixups\n");
3065
3066 /* Claiming to be 'chrp' is death */
3067 node = call_prom("finddevice", 1, 1, ADDR("/"));
3068 rv = prom_getprop(node, "device_type", prop, sizeof(prop));
3069 if (rv != PROM_ERROR && (prom_strcmp(prop, "chrp") == 0))
3070 prom_setprop(node, "/", "device_type", "efika", sizeof("efika"));
3071
3072 /* CODEGEN,description is exposed in /proc/cpuinfo so
3073 fix that too */
3074 rv = prom_getprop(node, "CODEGEN,description", prop, sizeof(prop));
3075 if (rv != PROM_ERROR && (prom_strstr(prop, "CHRP")))
3076 prom_setprop(node, "/", "CODEGEN,description",
3077 "Efika 5200B PowerPC System",
3078 sizeof("Efika 5200B PowerPC System"));
3079
3080 /* Fixup bestcomm interrupts property */
3081 node = call_prom("finddevice", 1, 1, ADDR("/builtin/bestcomm"));
3082 if (PHANDLE_VALID(node)) {
3083 len = prom_getproplen(node, "interrupts");
3084 if (len == 12) {
3085 prom_printf("Fixing bestcomm interrupts property\n");
3086 prom_setprop(node, "/builtin/bestcom", "interrupts",
3087 bcomm_irq, sizeof(bcomm_irq));
3088 }
3089 }
3090
3091 /* Fixup sound interrupts property */
3092 node = call_prom("finddevice", 1, 1, ADDR("/builtin/sound"));
3093 if (PHANDLE_VALID(node)) {
3094 rv = prom_getprop(node, "interrupts", prop, sizeof(prop));
3095 if (rv == PROM_ERROR) {
3096 prom_printf("Adding sound interrupts property\n");
3097 prom_setprop(node, "/builtin/sound", "interrupts",
3098 sound_irq, sizeof(sound_irq));
3099 }
3100 }
3101
3102 /* Make sure ethernet phy-handle property exists */
3103 fixup_device_tree_efika_add_phy();
3104}
3105#else
3106#define fixup_device_tree_efika()
3107#endif
3108
3109#ifdef CONFIG_PPC_PASEMI_NEMO
3110/*
3111 * CFE supplied on Nemo is broken in several ways, biggest
3112 * problem is that it reassigns ISA interrupts to unused mpic ints.
3113 * Add an interrupt-controller property for the io-bridge to use
3114 * and correct the ints so we can attach them to an irq_domain
3115 */
3116static void __init fixup_device_tree_pasemi(void)
3117{
3118 u32 interrupts[2], parent, rval, val = 0;
3119 char *name, *pci_name;
3120 phandle iob, node;
3121
3122 /* Find the root pci node */
3123 name = "/pxp@0,e0000000";
3124 iob = call_prom("finddevice", 1, 1, ADDR(name));
3125 if (!PHANDLE_VALID(iob))
3126 return;
3127
3128 /* check if interrupt-controller node set yet */
3129 if (prom_getproplen(iob, "interrupt-controller") !=PROM_ERROR)
3130 return;
3131
3132 prom_printf("adding interrupt-controller property for SB600...\n");
3133
3134 prom_setprop(iob, name, "interrupt-controller", &val, 0);
3135
3136 pci_name = "/pxp@0,e0000000/pci@11";
3137 node = call_prom("finddevice", 1, 1, ADDR(pci_name));
3138 parent = ADDR(iob);
3139
3140 for( ; prom_next_node(&node); ) {
3141 /* scan each node for one with an interrupt */
3142 if (!PHANDLE_VALID(node))
3143 continue;
3144
3145 rval = prom_getproplen(node, "interrupts");
3146 if (rval == 0 || rval == PROM_ERROR)
3147 continue;
3148
3149 prom_getprop(node, "interrupts", &interrupts, sizeof(interrupts));
3150 if ((interrupts[0] < 212) || (interrupts[0] > 222))
3151 continue;
3152
3153 /* found a node, update both interrupts and interrupt-parent */
3154 if ((interrupts[0] >= 212) && (interrupts[0] <= 215))
3155 interrupts[0] -= 203;
3156 if ((interrupts[0] >= 216) && (interrupts[0] <= 220))
3157 interrupts[0] -= 213;
3158 if (interrupts[0] == 221)
3159 interrupts[0] = 14;
3160 if (interrupts[0] == 222)
3161 interrupts[0] = 8;
3162
3163 prom_setprop(node, pci_name, "interrupts", interrupts,
3164 sizeof(interrupts));
3165 prom_setprop(node, pci_name, "interrupt-parent", &parent,
3166 sizeof(parent));
3167 }
3168
3169 /*
3170 * The io-bridge has device_type set to 'io-bridge' change it to 'isa'
3171 * so that generic isa-bridge code can add the SB600 and its on-board
3172 * peripherals.
3173 */
3174 name = "/pxp@0,e0000000/io-bridge@0";
3175 iob = call_prom("finddevice", 1, 1, ADDR(name));
3176 if (!PHANDLE_VALID(iob))
3177 return;
3178
3179 /* device_type is already set, just change it. */
3180
3181 prom_printf("Changing device_type of SB600 node...\n");
3182
3183 prom_setprop(iob, name, "device_type", "isa", sizeof("isa"));
3184}
3185#else /* !CONFIG_PPC_PASEMI_NEMO */
3186static inline void fixup_device_tree_pasemi(void) { }
3187#endif
3188
3189static void __init fixup_device_tree(void)
3190{
3191 fixup_device_tree_maple();
3192 fixup_device_tree_maple_memory_controller();
3193 fixup_device_tree_chrp();
3194 fixup_device_tree_pmac();
3195 fixup_device_tree_efika();
3196 fixup_device_tree_pasemi();
3197}
3198
3199static void __init prom_find_boot_cpu(void)
3200{
3201 __be32 rval;
3202 ihandle prom_cpu;
3203 phandle cpu_pkg;
3204
3205 rval = 0;
3206 if (prom_getprop(prom.chosen, "cpu", &rval, sizeof(rval)) <= 0)
3207 return;
3208 prom_cpu = be32_to_cpu(rval);
3209
3210 cpu_pkg = call_prom("instance-to-package", 1, 1, prom_cpu);
3211
3212 if (!PHANDLE_VALID(cpu_pkg))
3213 return;
3214
3215 prom_getprop(cpu_pkg, "reg", &rval, sizeof(rval));
3216 prom.cpu = be32_to_cpu(rval);
3217
3218 prom_debug("Booting CPU hw index = %d\n", prom.cpu);
3219}
3220
3221static void __init prom_check_initrd(unsigned long r3, unsigned long r4)
3222{
3223#ifdef CONFIG_BLK_DEV_INITRD
3224 if (r3 && r4 && r4 != 0xdeadbeef) {
3225 __be64 val;
3226
3227 prom_initrd_start = is_kernel_addr(r3) ? __pa(r3) : r3;
3228 prom_initrd_end = prom_initrd_start + r4;
3229
3230 val = cpu_to_be64(prom_initrd_start);
3231 prom_setprop(prom.chosen, "/chosen", "linux,initrd-start",
3232 &val, sizeof(val));
3233 val = cpu_to_be64(prom_initrd_end);
3234 prom_setprop(prom.chosen, "/chosen", "linux,initrd-end",
3235 &val, sizeof(val));
3236
3237 reserve_mem(prom_initrd_start,
3238 prom_initrd_end - prom_initrd_start);
3239
3240 prom_debug("initrd_start=0x%lx\n", prom_initrd_start);
3241 prom_debug("initrd_end=0x%lx\n", prom_initrd_end);
3242 }
3243#endif /* CONFIG_BLK_DEV_INITRD */
3244}
3245
3246#ifdef CONFIG_PPC_SVM
3247/*
3248 * Perform the Enter Secure Mode ultracall.
3249 */
3250static int enter_secure_mode(unsigned long kbase, unsigned long fdt)
3251{
3252 register unsigned long r3 asm("r3") = UV_ESM;
3253 register unsigned long r4 asm("r4") = kbase;
3254 register unsigned long r5 asm("r5") = fdt;
3255
3256 asm volatile("sc 2" : "+r"(r3) : "r"(r4), "r"(r5));
3257
3258 return r3;
3259}
3260
3261/*
3262 * Call the Ultravisor to transfer us to secure memory if we have an ESM blob.
3263 */
3264static void __init setup_secure_guest(unsigned long kbase, unsigned long fdt)
3265{
3266 int ret;
3267
3268 if (!prom_svm_enable)
3269 return;
3270
3271 /* Switch to secure mode. */
3272 prom_printf("Switching to secure mode.\n");
3273
3274 /*
3275 * The ultravisor will do an integrity check of the kernel image but we
3276 * relocated it so the check will fail. Restore the original image by
3277 * relocating it back to the kernel virtual base address.
3278 */
3279 relocate(KERNELBASE);
3280
3281 ret = enter_secure_mode(kbase, fdt);
3282
3283 /* Relocate the kernel again. */
3284 relocate(kbase);
3285
3286 if (ret != U_SUCCESS) {
3287 prom_printf("Returned %d from switching to secure mode.\n", ret);
3288 prom_rtas_os_term("Switch to secure mode failed.\n");
3289 }
3290}
3291#else
3292static void __init setup_secure_guest(unsigned long kbase, unsigned long fdt)
3293{
3294}
3295#endif /* CONFIG_PPC_SVM */
3296
3297/*
3298 * We enter here early on, when the Open Firmware prom is still
3299 * handling exceptions and the MMU hash table for us.
3300 */
3301
3302unsigned long __init prom_init(unsigned long r3, unsigned long r4,
3303 unsigned long pp,
3304 unsigned long r6, unsigned long r7,
3305 unsigned long kbase)
3306{
3307 unsigned long hdr;
3308
3309#ifdef CONFIG_PPC32
3310 unsigned long offset = reloc_offset();
3311 reloc_got2(offset);
3312#endif
3313
3314 /*
3315 * First zero the BSS
3316 */
3317 memset(&__bss_start, 0, __bss_stop - __bss_start);
3318
3319 /*
3320 * Init interface to Open Firmware, get some node references,
3321 * like /chosen
3322 */
3323 prom_init_client_services(pp);
3324
3325 /*
3326 * See if this OF is old enough that we need to do explicit maps
3327 * and other workarounds
3328 */
3329 prom_find_mmu();
3330
3331 /*
3332 * Init prom stdout device
3333 */
3334 prom_init_stdout();
3335
3336 prom_printf("Preparing to boot %s", linux_banner);
3337
3338 /*
3339 * Get default machine type. At this point, we do not differentiate
3340 * between pSeries SMP and pSeries LPAR
3341 */
3342 of_platform = prom_find_machine_type();
3343 prom_printf("Detected machine type: %x\n", of_platform);
3344
3345#ifndef CONFIG_NONSTATIC_KERNEL
3346 /* Bail if this is a kdump kernel. */
3347 if (PHYSICAL_START > 0)
3348 prom_panic("Error: You can't boot a kdump kernel from OF!\n");
3349#endif
3350
3351 /*
3352 * Check for an initrd
3353 */
3354 prom_check_initrd(r3, r4);
3355
3356 /*
3357 * Do early parsing of command line
3358 */
3359 early_cmdline_parse();
3360
3361#ifdef CONFIG_PPC_PSERIES
3362 /*
3363 * On pSeries, inform the firmware about our capabilities
3364 */
3365 if (of_platform == PLATFORM_PSERIES ||
3366 of_platform == PLATFORM_PSERIES_LPAR)
3367 prom_send_capabilities();
3368#endif
3369
3370 /*
3371 * Copy the CPU hold code
3372 */
3373 if (of_platform != PLATFORM_POWERMAC)
3374 copy_and_flush(0, kbase, 0x100, 0);
3375
3376 /*
3377 * Initialize memory management within prom_init
3378 */
3379 prom_init_mem();
3380
3381 /*
3382 * Determine which cpu is actually running right _now_
3383 */
3384 prom_find_boot_cpu();
3385
3386 /*
3387 * Initialize display devices
3388 */
3389 prom_check_displays();
3390
3391#if defined(CONFIG_PPC64) && defined(__BIG_ENDIAN__)
3392 /*
3393 * Initialize IOMMU (TCE tables) on pSeries. Do that before anything else
3394 * that uses the allocator, we need to make sure we get the top of memory
3395 * available for us here...
3396 */
3397 if (of_platform == PLATFORM_PSERIES)
3398 prom_initialize_tce_table();
3399#endif
3400
3401 /*
3402 * On non-powermacs, try to instantiate RTAS. PowerMacs don't
3403 * have a usable RTAS implementation.
3404 */
3405 if (of_platform != PLATFORM_POWERMAC)
3406 prom_instantiate_rtas();
3407
3408#ifdef CONFIG_PPC64
3409 /* instantiate sml */
3410 prom_instantiate_sml();
3411#endif
3412
3413 /*
3414 * On non-powermacs, put all CPUs in spin-loops.
3415 *
3416 * PowerMacs use a different mechanism to spin CPUs
3417 *
3418 * (This must be done after instanciating RTAS)
3419 */
3420 if (of_platform != PLATFORM_POWERMAC)
3421 prom_hold_cpus();
3422
3423 /*
3424 * Fill in some infos for use by the kernel later on
3425 */
3426 if (prom_memory_limit) {
3427 __be64 val = cpu_to_be64(prom_memory_limit);
3428 prom_setprop(prom.chosen, "/chosen", "linux,memory-limit",
3429 &val, sizeof(val));
3430 }
3431#ifdef CONFIG_PPC64
3432 if (prom_iommu_off)
3433 prom_setprop(prom.chosen, "/chosen", "linux,iommu-off",
3434 NULL, 0);
3435
3436 if (prom_iommu_force_on)
3437 prom_setprop(prom.chosen, "/chosen", "linux,iommu-force-on",
3438 NULL, 0);
3439
3440 if (prom_tce_alloc_start) {
3441 prom_setprop(prom.chosen, "/chosen", "linux,tce-alloc-start",
3442 &prom_tce_alloc_start,
3443 sizeof(prom_tce_alloc_start));
3444 prom_setprop(prom.chosen, "/chosen", "linux,tce-alloc-end",
3445 &prom_tce_alloc_end,
3446 sizeof(prom_tce_alloc_end));
3447 }
3448#endif
3449
3450 /*
3451 * Fixup any known bugs in the device-tree
3452 */
3453 fixup_device_tree();
3454
3455 /*
3456 * Now finally create the flattened device-tree
3457 */
3458 prom_printf("copying OF device tree...\n");
3459 flatten_device_tree();
3460
3461 /*
3462 * in case stdin is USB and still active on IBM machines...
3463 * Unfortunately quiesce crashes on some powermacs if we have
3464 * closed stdin already (in particular the powerbook 101).
3465 */
3466 if (of_platform != PLATFORM_POWERMAC)
3467 prom_close_stdin();
3468
3469 /*
3470 * Call OF "quiesce" method to shut down pending DMA's from
3471 * devices etc...
3472 */
3473 prom_printf("Quiescing Open Firmware ...\n");
3474 call_prom("quiesce", 0, 0);
3475
3476 /*
3477 * And finally, call the kernel passing it the flattened device
3478 * tree and NULL as r5, thus triggering the new entry point which
3479 * is common to us and kexec
3480 */
3481 hdr = dt_header_start;
3482
3483 prom_printf("Booting Linux via __start() @ 0x%lx ...\n", kbase);
3484 prom_debug("->dt_header_start=0x%lx\n", hdr);
3485
3486#ifdef CONFIG_PPC32
3487 reloc_got2(-offset);
3488#endif
3489
3490 /* Move to secure memory if we're supposed to be secure guests. */
3491 setup_secure_guest(kbase, hdr);
3492
3493 __start(hdr, kbase, 0, 0, 0, 0, 0);
3494
3495 return 0;
3496}
1/*
2 * Procedures for interfacing to Open Firmware.
3 *
4 * Paul Mackerras August 1996.
5 * Copyright (C) 1996-2005 Paul Mackerras.
6 *
7 * Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
8 * {engebret|bergner}@us.ibm.com
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
14 */
15
16#undef DEBUG_PROM
17
18#include <stdarg.h>
19#include <linux/kernel.h>
20#include <linux/string.h>
21#include <linux/init.h>
22#include <linux/threads.h>
23#include <linux/spinlock.h>
24#include <linux/types.h>
25#include <linux/pci.h>
26#include <linux/proc_fs.h>
27#include <linux/stringify.h>
28#include <linux/delay.h>
29#include <linux/initrd.h>
30#include <linux/bitops.h>
31#include <asm/prom.h>
32#include <asm/rtas.h>
33#include <asm/page.h>
34#include <asm/processor.h>
35#include <asm/irq.h>
36#include <asm/io.h>
37#include <asm/smp.h>
38#include <asm/system.h>
39#include <asm/mmu.h>
40#include <asm/pgtable.h>
41#include <asm/pci.h>
42#include <asm/iommu.h>
43#include <asm/btext.h>
44#include <asm/sections.h>
45#include <asm/machdep.h>
46
47#include <linux/linux_logo.h>
48
49/*
50 * Properties whose value is longer than this get excluded from our
51 * copy of the device tree. This value does need to be big enough to
52 * ensure that we don't lose things like the interrupt-map property
53 * on a PCI-PCI bridge.
54 */
55#define MAX_PROPERTY_LENGTH (1UL * 1024 * 1024)
56
57/*
58 * Eventually bump that one up
59 */
60#define DEVTREE_CHUNK_SIZE 0x100000
61
62/*
63 * This is the size of the local memory reserve map that gets copied
64 * into the boot params passed to the kernel. That size is totally
65 * flexible as the kernel just reads the list until it encounters an
66 * entry with size 0, so it can be changed without breaking binary
67 * compatibility
68 */
69#define MEM_RESERVE_MAP_SIZE 8
70
71/*
72 * prom_init() is called very early on, before the kernel text
73 * and data have been mapped to KERNELBASE. At this point the code
74 * is running at whatever address it has been loaded at.
75 * On ppc32 we compile with -mrelocatable, which means that references
76 * to extern and static variables get relocated automatically.
77 * On ppc64 we have to relocate the references explicitly with
78 * RELOC. (Note that strings count as static variables.)
79 *
80 * Because OF may have mapped I/O devices into the area starting at
81 * KERNELBASE, particularly on CHRP machines, we can't safely call
82 * OF once the kernel has been mapped to KERNELBASE. Therefore all
83 * OF calls must be done within prom_init().
84 *
85 * ADDR is used in calls to call_prom. The 4th and following
86 * arguments to call_prom should be 32-bit values.
87 * On ppc64, 64 bit values are truncated to 32 bits (and
88 * fortunately don't get interpreted as two arguments).
89 */
90#ifdef CONFIG_PPC64
91#define RELOC(x) (*PTRRELOC(&(x)))
92#define ADDR(x) (u32) add_reloc_offset((unsigned long)(x))
93#define OF_WORKAROUNDS 0
94#else
95#define RELOC(x) (x)
96#define ADDR(x) (u32) (x)
97#define OF_WORKAROUNDS of_workarounds
98int of_workarounds;
99#endif
100
101#define OF_WA_CLAIM 1 /* do phys/virt claim separately, then map */
102#define OF_WA_LONGTRAIL 2 /* work around longtrail bugs */
103
104#define PROM_BUG() do { \
105 prom_printf("kernel BUG at %s line 0x%x!\n", \
106 RELOC(__FILE__), __LINE__); \
107 __asm__ __volatile__(".long " BUG_ILLEGAL_INSTR); \
108} while (0)
109
110#ifdef DEBUG_PROM
111#define prom_debug(x...) prom_printf(x)
112#else
113#define prom_debug(x...)
114#endif
115
116
117typedef u32 prom_arg_t;
118
119struct prom_args {
120 u32 service;
121 u32 nargs;
122 u32 nret;
123 prom_arg_t args[10];
124};
125
126struct prom_t {
127 ihandle root;
128 phandle chosen;
129 int cpu;
130 ihandle stdout;
131 ihandle mmumap;
132 ihandle memory;
133};
134
135struct mem_map_entry {
136 u64 base;
137 u64 size;
138};
139
140typedef u32 cell_t;
141
142extern void __start(unsigned long r3, unsigned long r4, unsigned long r5);
143
144#ifdef CONFIG_PPC64
145extern int enter_prom(struct prom_args *args, unsigned long entry);
146#else
147static inline int enter_prom(struct prom_args *args, unsigned long entry)
148{
149 return ((int (*)(struct prom_args *))entry)(args);
150}
151#endif
152
153extern void copy_and_flush(unsigned long dest, unsigned long src,
154 unsigned long size, unsigned long offset);
155
156/* prom structure */
157static struct prom_t __initdata prom;
158
159static unsigned long prom_entry __initdata;
160
161#define PROM_SCRATCH_SIZE 256
162
163static char __initdata of_stdout_device[256];
164static char __initdata prom_scratch[PROM_SCRATCH_SIZE];
165
166static unsigned long __initdata dt_header_start;
167static unsigned long __initdata dt_struct_start, dt_struct_end;
168static unsigned long __initdata dt_string_start, dt_string_end;
169
170static unsigned long __initdata prom_initrd_start, prom_initrd_end;
171
172#ifdef CONFIG_PPC64
173static int __initdata prom_iommu_force_on;
174static int __initdata prom_iommu_off;
175static unsigned long __initdata prom_tce_alloc_start;
176static unsigned long __initdata prom_tce_alloc_end;
177#endif
178
179/* Platforms codes are now obsolete in the kernel. Now only used within this
180 * file and ultimately gone too. Feel free to change them if you need, they
181 * are not shared with anything outside of this file anymore
182 */
183#define PLATFORM_PSERIES 0x0100
184#define PLATFORM_PSERIES_LPAR 0x0101
185#define PLATFORM_LPAR 0x0001
186#define PLATFORM_POWERMAC 0x0400
187#define PLATFORM_GENERIC 0x0500
188
189static int __initdata of_platform;
190
191static char __initdata prom_cmd_line[COMMAND_LINE_SIZE];
192
193static unsigned long __initdata prom_memory_limit;
194
195static unsigned long __initdata alloc_top;
196static unsigned long __initdata alloc_top_high;
197static unsigned long __initdata alloc_bottom;
198static unsigned long __initdata rmo_top;
199static unsigned long __initdata ram_top;
200
201static struct mem_map_entry __initdata mem_reserve_map[MEM_RESERVE_MAP_SIZE];
202static int __initdata mem_reserve_cnt;
203
204static cell_t __initdata regbuf[1024];
205
206
207/*
208 * Error results ... some OF calls will return "-1" on error, some
209 * will return 0, some will return either. To simplify, here are
210 * macros to use with any ihandle or phandle return value to check if
211 * it is valid
212 */
213
214#define PROM_ERROR (-1u)
215#define PHANDLE_VALID(p) ((p) != 0 && (p) != PROM_ERROR)
216#define IHANDLE_VALID(i) ((i) != 0 && (i) != PROM_ERROR)
217
218
219/* This is the one and *ONLY* place where we actually call open
220 * firmware.
221 */
222
223static int __init call_prom(const char *service, int nargs, int nret, ...)
224{
225 int i;
226 struct prom_args args;
227 va_list list;
228
229 args.service = ADDR(service);
230 args.nargs = nargs;
231 args.nret = nret;
232
233 va_start(list, nret);
234 for (i = 0; i < nargs; i++)
235 args.args[i] = va_arg(list, prom_arg_t);
236 va_end(list);
237
238 for (i = 0; i < nret; i++)
239 args.args[nargs+i] = 0;
240
241 if (enter_prom(&args, RELOC(prom_entry)) < 0)
242 return PROM_ERROR;
243
244 return (nret > 0) ? args.args[nargs] : 0;
245}
246
247static int __init call_prom_ret(const char *service, int nargs, int nret,
248 prom_arg_t *rets, ...)
249{
250 int i;
251 struct prom_args args;
252 va_list list;
253
254 args.service = ADDR(service);
255 args.nargs = nargs;
256 args.nret = nret;
257
258 va_start(list, rets);
259 for (i = 0; i < nargs; i++)
260 args.args[i] = va_arg(list, prom_arg_t);
261 va_end(list);
262
263 for (i = 0; i < nret; i++)
264 args.args[nargs+i] = 0;
265
266 if (enter_prom(&args, RELOC(prom_entry)) < 0)
267 return PROM_ERROR;
268
269 if (rets != NULL)
270 for (i = 1; i < nret; ++i)
271 rets[i-1] = args.args[nargs+i];
272
273 return (nret > 0) ? args.args[nargs] : 0;
274}
275
276
277static void __init prom_print(const char *msg)
278{
279 const char *p, *q;
280 struct prom_t *_prom = &RELOC(prom);
281
282 if (_prom->stdout == 0)
283 return;
284
285 for (p = msg; *p != 0; p = q) {
286 for (q = p; *q != 0 && *q != '\n'; ++q)
287 ;
288 if (q > p)
289 call_prom("write", 3, 1, _prom->stdout, p, q - p);
290 if (*q == 0)
291 break;
292 ++q;
293 call_prom("write", 3, 1, _prom->stdout, ADDR("\r\n"), 2);
294 }
295}
296
297
298static void __init prom_print_hex(unsigned long val)
299{
300 int i, nibbles = sizeof(val)*2;
301 char buf[sizeof(val)*2+1];
302 struct prom_t *_prom = &RELOC(prom);
303
304 for (i = nibbles-1; i >= 0; i--) {
305 buf[i] = (val & 0xf) + '0';
306 if (buf[i] > '9')
307 buf[i] += ('a'-'0'-10);
308 val >>= 4;
309 }
310 buf[nibbles] = '\0';
311 call_prom("write", 3, 1, _prom->stdout, buf, nibbles);
312}
313
314/* max number of decimal digits in an unsigned long */
315#define UL_DIGITS 21
316static void __init prom_print_dec(unsigned long val)
317{
318 int i, size;
319 char buf[UL_DIGITS+1];
320 struct prom_t *_prom = &RELOC(prom);
321
322 for (i = UL_DIGITS-1; i >= 0; i--) {
323 buf[i] = (val % 10) + '0';
324 val = val/10;
325 if (val == 0)
326 break;
327 }
328 /* shift stuff down */
329 size = UL_DIGITS - i;
330 call_prom("write", 3, 1, _prom->stdout, buf+i, size);
331}
332
333static void __init prom_printf(const char *format, ...)
334{
335 const char *p, *q, *s;
336 va_list args;
337 unsigned long v;
338 long vs;
339 struct prom_t *_prom = &RELOC(prom);
340
341 va_start(args, format);
342#ifdef CONFIG_PPC64
343 format = PTRRELOC(format);
344#endif
345 for (p = format; *p != 0; p = q) {
346 for (q = p; *q != 0 && *q != '\n' && *q != '%'; ++q)
347 ;
348 if (q > p)
349 call_prom("write", 3, 1, _prom->stdout, p, q - p);
350 if (*q == 0)
351 break;
352 if (*q == '\n') {
353 ++q;
354 call_prom("write", 3, 1, _prom->stdout,
355 ADDR("\r\n"), 2);
356 continue;
357 }
358 ++q;
359 if (*q == 0)
360 break;
361 switch (*q) {
362 case 's':
363 ++q;
364 s = va_arg(args, const char *);
365 prom_print(s);
366 break;
367 case 'x':
368 ++q;
369 v = va_arg(args, unsigned long);
370 prom_print_hex(v);
371 break;
372 case 'd':
373 ++q;
374 vs = va_arg(args, int);
375 if (vs < 0) {
376 prom_print(RELOC("-"));
377 vs = -vs;
378 }
379 prom_print_dec(vs);
380 break;
381 case 'l':
382 ++q;
383 if (*q == 0)
384 break;
385 else if (*q == 'x') {
386 ++q;
387 v = va_arg(args, unsigned long);
388 prom_print_hex(v);
389 } else if (*q == 'u') { /* '%lu' */
390 ++q;
391 v = va_arg(args, unsigned long);
392 prom_print_dec(v);
393 } else if (*q == 'd') { /* %ld */
394 ++q;
395 vs = va_arg(args, long);
396 if (vs < 0) {
397 prom_print(RELOC("-"));
398 vs = -vs;
399 }
400 prom_print_dec(vs);
401 }
402 break;
403 }
404 }
405}
406
407
408static unsigned int __init prom_claim(unsigned long virt, unsigned long size,
409 unsigned long align)
410{
411 struct prom_t *_prom = &RELOC(prom);
412
413 if (align == 0 && (OF_WORKAROUNDS & OF_WA_CLAIM)) {
414 /*
415 * Old OF requires we claim physical and virtual separately
416 * and then map explicitly (assuming virtual mode)
417 */
418 int ret;
419 prom_arg_t result;
420
421 ret = call_prom_ret("call-method", 5, 2, &result,
422 ADDR("claim"), _prom->memory,
423 align, size, virt);
424 if (ret != 0 || result == -1)
425 return -1;
426 ret = call_prom_ret("call-method", 5, 2, &result,
427 ADDR("claim"), _prom->mmumap,
428 align, size, virt);
429 if (ret != 0) {
430 call_prom("call-method", 4, 1, ADDR("release"),
431 _prom->memory, size, virt);
432 return -1;
433 }
434 /* the 0x12 is M (coherence) + PP == read/write */
435 call_prom("call-method", 6, 1,
436 ADDR("map"), _prom->mmumap, 0x12, size, virt, virt);
437 return virt;
438 }
439 return call_prom("claim", 3, 1, (prom_arg_t)virt, (prom_arg_t)size,
440 (prom_arg_t)align);
441}
442
443static void __init __attribute__((noreturn)) prom_panic(const char *reason)
444{
445#ifdef CONFIG_PPC64
446 reason = PTRRELOC(reason);
447#endif
448 prom_print(reason);
449 /* Do not call exit because it clears the screen on pmac
450 * it also causes some sort of double-fault on early pmacs */
451 if (RELOC(of_platform) == PLATFORM_POWERMAC)
452 asm("trap\n");
453
454 /* ToDo: should put up an SRC here on p/iSeries */
455 call_prom("exit", 0, 0);
456
457 for (;;) /* should never get here */
458 ;
459}
460
461
462static int __init prom_next_node(phandle *nodep)
463{
464 phandle node;
465
466 if ((node = *nodep) != 0
467 && (*nodep = call_prom("child", 1, 1, node)) != 0)
468 return 1;
469 if ((*nodep = call_prom("peer", 1, 1, node)) != 0)
470 return 1;
471 for (;;) {
472 if ((node = call_prom("parent", 1, 1, node)) == 0)
473 return 0;
474 if ((*nodep = call_prom("peer", 1, 1, node)) != 0)
475 return 1;
476 }
477}
478
479static int inline prom_getprop(phandle node, const char *pname,
480 void *value, size_t valuelen)
481{
482 return call_prom("getprop", 4, 1, node, ADDR(pname),
483 (u32)(unsigned long) value, (u32) valuelen);
484}
485
486static int inline prom_getproplen(phandle node, const char *pname)
487{
488 return call_prom("getproplen", 2, 1, node, ADDR(pname));
489}
490
491static void add_string(char **str, const char *q)
492{
493 char *p = *str;
494
495 while (*q)
496 *p++ = *q++;
497 *p++ = ' ';
498 *str = p;
499}
500
501static char *tohex(unsigned int x)
502{
503 static char digits[] = "0123456789abcdef";
504 static char result[9];
505 int i;
506
507 result[8] = 0;
508 i = 8;
509 do {
510 --i;
511 result[i] = digits[x & 0xf];
512 x >>= 4;
513 } while (x != 0 && i > 0);
514 return &result[i];
515}
516
517static int __init prom_setprop(phandle node, const char *nodename,
518 const char *pname, void *value, size_t valuelen)
519{
520 char cmd[256], *p;
521
522 if (!(OF_WORKAROUNDS & OF_WA_LONGTRAIL))
523 return call_prom("setprop", 4, 1, node, ADDR(pname),
524 (u32)(unsigned long) value, (u32) valuelen);
525
526 /* gah... setprop doesn't work on longtrail, have to use interpret */
527 p = cmd;
528 add_string(&p, "dev");
529 add_string(&p, nodename);
530 add_string(&p, tohex((u32)(unsigned long) value));
531 add_string(&p, tohex(valuelen));
532 add_string(&p, tohex(ADDR(pname)));
533 add_string(&p, tohex(strlen(RELOC(pname))));
534 add_string(&p, "property");
535 *p = 0;
536 return call_prom("interpret", 1, 1, (u32)(unsigned long) cmd);
537}
538
539/* We can't use the standard versions because of RELOC headaches. */
540#define isxdigit(c) (('0' <= (c) && (c) <= '9') \
541 || ('a' <= (c) && (c) <= 'f') \
542 || ('A' <= (c) && (c) <= 'F'))
543
544#define isdigit(c) ('0' <= (c) && (c) <= '9')
545#define islower(c) ('a' <= (c) && (c) <= 'z')
546#define toupper(c) (islower(c) ? ((c) - 'a' + 'A') : (c))
547
548unsigned long prom_strtoul(const char *cp, const char **endp)
549{
550 unsigned long result = 0, base = 10, value;
551
552 if (*cp == '0') {
553 base = 8;
554 cp++;
555 if (toupper(*cp) == 'X') {
556 cp++;
557 base = 16;
558 }
559 }
560
561 while (isxdigit(*cp) &&
562 (value = isdigit(*cp) ? *cp - '0' : toupper(*cp) - 'A' + 10) < base) {
563 result = result * base + value;
564 cp++;
565 }
566
567 if (endp)
568 *endp = cp;
569
570 return result;
571}
572
573unsigned long prom_memparse(const char *ptr, const char **retptr)
574{
575 unsigned long ret = prom_strtoul(ptr, retptr);
576 int shift = 0;
577
578 /*
579 * We can't use a switch here because GCC *may* generate a
580 * jump table which won't work, because we're not running at
581 * the address we're linked at.
582 */
583 if ('G' == **retptr || 'g' == **retptr)
584 shift = 30;
585
586 if ('M' == **retptr || 'm' == **retptr)
587 shift = 20;
588
589 if ('K' == **retptr || 'k' == **retptr)
590 shift = 10;
591
592 if (shift) {
593 ret <<= shift;
594 (*retptr)++;
595 }
596
597 return ret;
598}
599
600/*
601 * Early parsing of the command line passed to the kernel, used for
602 * "mem=x" and the options that affect the iommu
603 */
604static void __init early_cmdline_parse(void)
605{
606 struct prom_t *_prom = &RELOC(prom);
607 const char *opt;
608
609 char *p;
610 int l = 0;
611
612 RELOC(prom_cmd_line[0]) = 0;
613 p = RELOC(prom_cmd_line);
614 if ((long)_prom->chosen > 0)
615 l = prom_getprop(_prom->chosen, "bootargs", p, COMMAND_LINE_SIZE-1);
616#ifdef CONFIG_CMDLINE
617 if (l <= 0 || p[0] == '\0') /* dbl check */
618 strlcpy(RELOC(prom_cmd_line),
619 RELOC(CONFIG_CMDLINE), sizeof(prom_cmd_line));
620#endif /* CONFIG_CMDLINE */
621 prom_printf("command line: %s\n", RELOC(prom_cmd_line));
622
623#ifdef CONFIG_PPC64
624 opt = strstr(RELOC(prom_cmd_line), RELOC("iommu="));
625 if (opt) {
626 prom_printf("iommu opt is: %s\n", opt);
627 opt += 6;
628 while (*opt && *opt == ' ')
629 opt++;
630 if (!strncmp(opt, RELOC("off"), 3))
631 RELOC(prom_iommu_off) = 1;
632 else if (!strncmp(opt, RELOC("force"), 5))
633 RELOC(prom_iommu_force_on) = 1;
634 }
635#endif
636 opt = strstr(RELOC(prom_cmd_line), RELOC("mem="));
637 if (opt) {
638 opt += 4;
639 RELOC(prom_memory_limit) = prom_memparse(opt, (const char **)&opt);
640#ifdef CONFIG_PPC64
641 /* Align to 16 MB == size of ppc64 large page */
642 RELOC(prom_memory_limit) = ALIGN(RELOC(prom_memory_limit), 0x1000000);
643#endif
644 }
645}
646
647#ifdef CONFIG_PPC_PSERIES
648/*
649 * There are two methods for telling firmware what our capabilities are.
650 * Newer machines have an "ibm,client-architecture-support" method on the
651 * root node. For older machines, we have to call the "process-elf-header"
652 * method in the /packages/elf-loader node, passing it a fake 32-bit
653 * ELF header containing a couple of PT_NOTE sections that contain
654 * structures that contain various information.
655 */
656
657/*
658 * New method - extensible architecture description vector.
659 *
660 * Because the description vector contains a mix of byte and word
661 * values, we declare it as an unsigned char array, and use this
662 * macro to put word values in.
663 */
664#define W(x) ((x) >> 24) & 0xff, ((x) >> 16) & 0xff, \
665 ((x) >> 8) & 0xff, (x) & 0xff
666
667/* Option vector bits - generic bits in byte 1 */
668#define OV_IGNORE 0x80 /* ignore this vector */
669#define OV_CESSATION_POLICY 0x40 /* halt if unsupported option present*/
670
671/* Option vector 1: processor architectures supported */
672#define OV1_PPC_2_00 0x80 /* set if we support PowerPC 2.00 */
673#define OV1_PPC_2_01 0x40 /* set if we support PowerPC 2.01 */
674#define OV1_PPC_2_02 0x20 /* set if we support PowerPC 2.02 */
675#define OV1_PPC_2_03 0x10 /* set if we support PowerPC 2.03 */
676#define OV1_PPC_2_04 0x08 /* set if we support PowerPC 2.04 */
677#define OV1_PPC_2_05 0x04 /* set if we support PowerPC 2.05 */
678#define OV1_PPC_2_06 0x02 /* set if we support PowerPC 2.06 */
679
680/* Option vector 2: Open Firmware options supported */
681#define OV2_REAL_MODE 0x20 /* set if we want OF in real mode */
682
683/* Option vector 3: processor options supported */
684#define OV3_FP 0x80 /* floating point */
685#define OV3_VMX 0x40 /* VMX/Altivec */
686#define OV3_DFP 0x20 /* decimal FP */
687
688/* Option vector 5: PAPR/OF options supported */
689#define OV5_LPAR 0x80 /* logical partitioning supported */
690#define OV5_SPLPAR 0x40 /* shared-processor LPAR supported */
691/* ibm,dynamic-reconfiguration-memory property supported */
692#define OV5_DRCONF_MEMORY 0x20
693#define OV5_LARGE_PAGES 0x10 /* large pages supported */
694#define OV5_DONATE_DEDICATE_CPU 0x02 /* donate dedicated CPU support */
695/* PCIe/MSI support. Without MSI full PCIe is not supported */
696#ifdef CONFIG_PCI_MSI
697#define OV5_MSI 0x01 /* PCIe/MSI support */
698#else
699#define OV5_MSI 0x00
700#endif /* CONFIG_PCI_MSI */
701#ifdef CONFIG_PPC_SMLPAR
702#define OV5_CMO 0x80 /* Cooperative Memory Overcommitment */
703#define OV5_XCMO 0x40 /* Page Coalescing */
704#else
705#define OV5_CMO 0x00
706#define OV5_XCMO 0x00
707#endif
708#define OV5_TYPE1_AFFINITY 0x80 /* Type 1 NUMA affinity */
709
710/* Option Vector 6: IBM PAPR hints */
711#define OV6_LINUX 0x02 /* Linux is our OS */
712
713/*
714 * The architecture vector has an array of PVR mask/value pairs,
715 * followed by # option vectors - 1, followed by the option vectors.
716 */
717static unsigned char ibm_architecture_vec[] = {
718 W(0xfffe0000), W(0x003a0000), /* POWER5/POWER5+ */
719 W(0xffff0000), W(0x003e0000), /* POWER6 */
720 W(0xffff0000), W(0x003f0000), /* POWER7 */
721 W(0xffffffff), W(0x0f000003), /* all 2.06-compliant */
722 W(0xffffffff), W(0x0f000002), /* all 2.05-compliant */
723 W(0xfffffffe), W(0x0f000001), /* all 2.04-compliant and earlier */
724 6 - 1, /* 6 option vectors */
725
726 /* option vector 1: processor architectures supported */
727 3 - 2, /* length */
728 0, /* don't ignore, don't halt */
729 OV1_PPC_2_00 | OV1_PPC_2_01 | OV1_PPC_2_02 | OV1_PPC_2_03 |
730 OV1_PPC_2_04 | OV1_PPC_2_05 | OV1_PPC_2_06,
731
732 /* option vector 2: Open Firmware options supported */
733 34 - 2, /* length */
734 OV2_REAL_MODE,
735 0, 0,
736 W(0xffffffff), /* real_base */
737 W(0xffffffff), /* real_size */
738 W(0xffffffff), /* virt_base */
739 W(0xffffffff), /* virt_size */
740 W(0xffffffff), /* load_base */
741 W(64), /* 64MB min RMA */
742 W(0xffffffff), /* full client load */
743 0, /* min RMA percentage of total RAM */
744 48, /* max log_2(hash table size) */
745
746 /* option vector 3: processor options supported */
747 3 - 2, /* length */
748 0, /* don't ignore, don't halt */
749 OV3_FP | OV3_VMX | OV3_DFP,
750
751 /* option vector 4: IBM PAPR implementation */
752 2 - 2, /* length */
753 0, /* don't halt */
754
755 /* option vector 5: PAPR/OF options */
756 13 - 2, /* length */
757 0, /* don't ignore, don't halt */
758 OV5_LPAR | OV5_SPLPAR | OV5_LARGE_PAGES | OV5_DRCONF_MEMORY |
759 OV5_DONATE_DEDICATE_CPU | OV5_MSI,
760 0,
761 OV5_CMO | OV5_XCMO,
762 OV5_TYPE1_AFFINITY,
763 0,
764 0,
765 0,
766 /* WARNING: The offset of the "number of cores" field below
767 * must match by the macro below. Update the definition if
768 * the structure layout changes.
769 */
770#define IBM_ARCH_VEC_NRCORES_OFFSET 100
771 W(NR_CPUS), /* number of cores supported */
772
773 /* option vector 6: IBM PAPR hints */
774 4 - 2, /* length */
775 0,
776 0,
777 OV6_LINUX,
778
779};
780
781/* Old method - ELF header with PT_NOTE sections */
782static struct fake_elf {
783 Elf32_Ehdr elfhdr;
784 Elf32_Phdr phdr[2];
785 struct chrpnote {
786 u32 namesz;
787 u32 descsz;
788 u32 type;
789 char name[8]; /* "PowerPC" */
790 struct chrpdesc {
791 u32 real_mode;
792 u32 real_base;
793 u32 real_size;
794 u32 virt_base;
795 u32 virt_size;
796 u32 load_base;
797 } chrpdesc;
798 } chrpnote;
799 struct rpanote {
800 u32 namesz;
801 u32 descsz;
802 u32 type;
803 char name[24]; /* "IBM,RPA-Client-Config" */
804 struct rpadesc {
805 u32 lpar_affinity;
806 u32 min_rmo_size;
807 u32 min_rmo_percent;
808 u32 max_pft_size;
809 u32 splpar;
810 u32 min_load;
811 u32 new_mem_def;
812 u32 ignore_me;
813 } rpadesc;
814 } rpanote;
815} fake_elf = {
816 .elfhdr = {
817 .e_ident = { 0x7f, 'E', 'L', 'F',
818 ELFCLASS32, ELFDATA2MSB, EV_CURRENT },
819 .e_type = ET_EXEC, /* yeah right */
820 .e_machine = EM_PPC,
821 .e_version = EV_CURRENT,
822 .e_phoff = offsetof(struct fake_elf, phdr),
823 .e_phentsize = sizeof(Elf32_Phdr),
824 .e_phnum = 2
825 },
826 .phdr = {
827 [0] = {
828 .p_type = PT_NOTE,
829 .p_offset = offsetof(struct fake_elf, chrpnote),
830 .p_filesz = sizeof(struct chrpnote)
831 }, [1] = {
832 .p_type = PT_NOTE,
833 .p_offset = offsetof(struct fake_elf, rpanote),
834 .p_filesz = sizeof(struct rpanote)
835 }
836 },
837 .chrpnote = {
838 .namesz = sizeof("PowerPC"),
839 .descsz = sizeof(struct chrpdesc),
840 .type = 0x1275,
841 .name = "PowerPC",
842 .chrpdesc = {
843 .real_mode = ~0U, /* ~0 means "don't care" */
844 .real_base = ~0U,
845 .real_size = ~0U,
846 .virt_base = ~0U,
847 .virt_size = ~0U,
848 .load_base = ~0U
849 },
850 },
851 .rpanote = {
852 .namesz = sizeof("IBM,RPA-Client-Config"),
853 .descsz = sizeof(struct rpadesc),
854 .type = 0x12759999,
855 .name = "IBM,RPA-Client-Config",
856 .rpadesc = {
857 .lpar_affinity = 0,
858 .min_rmo_size = 64, /* in megabytes */
859 .min_rmo_percent = 0,
860 .max_pft_size = 48, /* 2^48 bytes max PFT size */
861 .splpar = 1,
862 .min_load = ~0U,
863 .new_mem_def = 0
864 }
865 }
866};
867
868static int __init prom_count_smt_threads(void)
869{
870 phandle node;
871 char type[64];
872 unsigned int plen;
873
874 /* Pick up th first CPU node we can find */
875 for (node = 0; prom_next_node(&node); ) {
876 type[0] = 0;
877 prom_getprop(node, "device_type", type, sizeof(type));
878
879 if (strcmp(type, RELOC("cpu")))
880 continue;
881 /*
882 * There is an entry for each smt thread, each entry being
883 * 4 bytes long. All cpus should have the same number of
884 * smt threads, so return after finding the first.
885 */
886 plen = prom_getproplen(node, "ibm,ppc-interrupt-server#s");
887 if (plen == PROM_ERROR)
888 break;
889 plen >>= 2;
890 prom_debug("Found %lu smt threads per core\n", (unsigned long)plen);
891
892 /* Sanity check */
893 if (plen < 1 || plen > 64) {
894 prom_printf("Threads per core %lu out of bounds, assuming 1\n",
895 (unsigned long)plen);
896 return 1;
897 }
898 return plen;
899 }
900 prom_debug("No threads found, assuming 1 per core\n");
901
902 return 1;
903
904}
905
906
907static void __init prom_send_capabilities(void)
908{
909 ihandle elfloader, root;
910 prom_arg_t ret;
911 u32 *cores;
912
913 root = call_prom("open", 1, 1, ADDR("/"));
914 if (root != 0) {
915 /* We need to tell the FW about the number of cores we support.
916 *
917 * To do that, we count the number of threads on the first core
918 * (we assume this is the same for all cores) and use it to
919 * divide NR_CPUS.
920 */
921 cores = (u32 *)PTRRELOC(&ibm_architecture_vec[IBM_ARCH_VEC_NRCORES_OFFSET]);
922 if (*cores != NR_CPUS) {
923 prom_printf("WARNING ! "
924 "ibm_architecture_vec structure inconsistent: %lu!\n",
925 *cores);
926 } else {
927 *cores = DIV_ROUND_UP(NR_CPUS, prom_count_smt_threads());
928 prom_printf("Max number of cores passed to firmware: %lu (NR_CPUS = %lu)\n",
929 *cores, NR_CPUS);
930 }
931
932 /* try calling the ibm,client-architecture-support method */
933 prom_printf("Calling ibm,client-architecture-support...");
934 if (call_prom_ret("call-method", 3, 2, &ret,
935 ADDR("ibm,client-architecture-support"),
936 root,
937 ADDR(ibm_architecture_vec)) == 0) {
938 /* the call exists... */
939 if (ret)
940 prom_printf("\nWARNING: ibm,client-architecture"
941 "-support call FAILED!\n");
942 call_prom("close", 1, 0, root);
943 prom_printf(" done\n");
944 return;
945 }
946 call_prom("close", 1, 0, root);
947 prom_printf(" not implemented\n");
948 }
949
950 /* no ibm,client-architecture-support call, try the old way */
951 elfloader = call_prom("open", 1, 1, ADDR("/packages/elf-loader"));
952 if (elfloader == 0) {
953 prom_printf("couldn't open /packages/elf-loader\n");
954 return;
955 }
956 call_prom("call-method", 3, 1, ADDR("process-elf-header"),
957 elfloader, ADDR(&fake_elf));
958 call_prom("close", 1, 0, elfloader);
959}
960#endif
961
962/*
963 * Memory allocation strategy... our layout is normally:
964 *
965 * at 14Mb or more we have vmlinux, then a gap and initrd. In some
966 * rare cases, initrd might end up being before the kernel though.
967 * We assume this won't override the final kernel at 0, we have no
968 * provision to handle that in this version, but it should hopefully
969 * never happen.
970 *
971 * alloc_top is set to the top of RMO, eventually shrink down if the
972 * TCEs overlap
973 *
974 * alloc_bottom is set to the top of kernel/initrd
975 *
976 * from there, allocations are done this way : rtas is allocated
977 * topmost, and the device-tree is allocated from the bottom. We try
978 * to grow the device-tree allocation as we progress. If we can't,
979 * then we fail, we don't currently have a facility to restart
980 * elsewhere, but that shouldn't be necessary.
981 *
982 * Note that calls to reserve_mem have to be done explicitly, memory
983 * allocated with either alloc_up or alloc_down isn't automatically
984 * reserved.
985 */
986
987
988/*
989 * Allocates memory in the RMO upward from the kernel/initrd
990 *
991 * When align is 0, this is a special case, it means to allocate in place
992 * at the current location of alloc_bottom or fail (that is basically
993 * extending the previous allocation). Used for the device-tree flattening
994 */
995static unsigned long __init alloc_up(unsigned long size, unsigned long align)
996{
997 unsigned long base = RELOC(alloc_bottom);
998 unsigned long addr = 0;
999
1000 if (align)
1001 base = _ALIGN_UP(base, align);
1002 prom_debug("alloc_up(%x, %x)\n", size, align);
1003 if (RELOC(ram_top) == 0)
1004 prom_panic("alloc_up() called with mem not initialized\n");
1005
1006 if (align)
1007 base = _ALIGN_UP(RELOC(alloc_bottom), align);
1008 else
1009 base = RELOC(alloc_bottom);
1010
1011 for(; (base + size) <= RELOC(alloc_top);
1012 base = _ALIGN_UP(base + 0x100000, align)) {
1013 prom_debug(" trying: 0x%x\n\r", base);
1014 addr = (unsigned long)prom_claim(base, size, 0);
1015 if (addr != PROM_ERROR && addr != 0)
1016 break;
1017 addr = 0;
1018 if (align == 0)
1019 break;
1020 }
1021 if (addr == 0)
1022 return 0;
1023 RELOC(alloc_bottom) = addr + size;
1024
1025 prom_debug(" -> %x\n", addr);
1026 prom_debug(" alloc_bottom : %x\n", RELOC(alloc_bottom));
1027 prom_debug(" alloc_top : %x\n", RELOC(alloc_top));
1028 prom_debug(" alloc_top_hi : %x\n", RELOC(alloc_top_high));
1029 prom_debug(" rmo_top : %x\n", RELOC(rmo_top));
1030 prom_debug(" ram_top : %x\n", RELOC(ram_top));
1031
1032 return addr;
1033}
1034
1035/*
1036 * Allocates memory downward, either from top of RMO, or if highmem
1037 * is set, from the top of RAM. Note that this one doesn't handle
1038 * failures. It does claim memory if highmem is not set.
1039 */
1040static unsigned long __init alloc_down(unsigned long size, unsigned long align,
1041 int highmem)
1042{
1043 unsigned long base, addr = 0;
1044
1045 prom_debug("alloc_down(%x, %x, %s)\n", size, align,
1046 highmem ? RELOC("(high)") : RELOC("(low)"));
1047 if (RELOC(ram_top) == 0)
1048 prom_panic("alloc_down() called with mem not initialized\n");
1049
1050 if (highmem) {
1051 /* Carve out storage for the TCE table. */
1052 addr = _ALIGN_DOWN(RELOC(alloc_top_high) - size, align);
1053 if (addr <= RELOC(alloc_bottom))
1054 return 0;
1055 /* Will we bump into the RMO ? If yes, check out that we
1056 * didn't overlap existing allocations there, if we did,
1057 * we are dead, we must be the first in town !
1058 */
1059 if (addr < RELOC(rmo_top)) {
1060 /* Good, we are first */
1061 if (RELOC(alloc_top) == RELOC(rmo_top))
1062 RELOC(alloc_top) = RELOC(rmo_top) = addr;
1063 else
1064 return 0;
1065 }
1066 RELOC(alloc_top_high) = addr;
1067 goto bail;
1068 }
1069
1070 base = _ALIGN_DOWN(RELOC(alloc_top) - size, align);
1071 for (; base > RELOC(alloc_bottom);
1072 base = _ALIGN_DOWN(base - 0x100000, align)) {
1073 prom_debug(" trying: 0x%x\n\r", base);
1074 addr = (unsigned long)prom_claim(base, size, 0);
1075 if (addr != PROM_ERROR && addr != 0)
1076 break;
1077 addr = 0;
1078 }
1079 if (addr == 0)
1080 return 0;
1081 RELOC(alloc_top) = addr;
1082
1083 bail:
1084 prom_debug(" -> %x\n", addr);
1085 prom_debug(" alloc_bottom : %x\n", RELOC(alloc_bottom));
1086 prom_debug(" alloc_top : %x\n", RELOC(alloc_top));
1087 prom_debug(" alloc_top_hi : %x\n", RELOC(alloc_top_high));
1088 prom_debug(" rmo_top : %x\n", RELOC(rmo_top));
1089 prom_debug(" ram_top : %x\n", RELOC(ram_top));
1090
1091 return addr;
1092}
1093
1094/*
1095 * Parse a "reg" cell
1096 */
1097static unsigned long __init prom_next_cell(int s, cell_t **cellp)
1098{
1099 cell_t *p = *cellp;
1100 unsigned long r = 0;
1101
1102 /* Ignore more than 2 cells */
1103 while (s > sizeof(unsigned long) / 4) {
1104 p++;
1105 s--;
1106 }
1107 r = *p++;
1108#ifdef CONFIG_PPC64
1109 if (s > 1) {
1110 r <<= 32;
1111 r |= *(p++);
1112 }
1113#endif
1114 *cellp = p;
1115 return r;
1116}
1117
1118/*
1119 * Very dumb function for adding to the memory reserve list, but
1120 * we don't need anything smarter at this point
1121 *
1122 * XXX Eventually check for collisions. They should NEVER happen.
1123 * If problems seem to show up, it would be a good start to track
1124 * them down.
1125 */
1126static void __init reserve_mem(u64 base, u64 size)
1127{
1128 u64 top = base + size;
1129 unsigned long cnt = RELOC(mem_reserve_cnt);
1130
1131 if (size == 0)
1132 return;
1133
1134 /* We need to always keep one empty entry so that we
1135 * have our terminator with "size" set to 0 since we are
1136 * dumb and just copy this entire array to the boot params
1137 */
1138 base = _ALIGN_DOWN(base, PAGE_SIZE);
1139 top = _ALIGN_UP(top, PAGE_SIZE);
1140 size = top - base;
1141
1142 if (cnt >= (MEM_RESERVE_MAP_SIZE - 1))
1143 prom_panic("Memory reserve map exhausted !\n");
1144 RELOC(mem_reserve_map)[cnt].base = base;
1145 RELOC(mem_reserve_map)[cnt].size = size;
1146 RELOC(mem_reserve_cnt) = cnt + 1;
1147}
1148
1149/*
1150 * Initialize memory allocation mechanism, parse "memory" nodes and
1151 * obtain that way the top of memory and RMO to setup out local allocator
1152 */
1153static void __init prom_init_mem(void)
1154{
1155 phandle node;
1156 char *path, type[64];
1157 unsigned int plen;
1158 cell_t *p, *endp;
1159 struct prom_t *_prom = &RELOC(prom);
1160 u32 rac, rsc;
1161
1162 /*
1163 * We iterate the memory nodes to find
1164 * 1) top of RMO (first node)
1165 * 2) top of memory
1166 */
1167 rac = 2;
1168 prom_getprop(_prom->root, "#address-cells", &rac, sizeof(rac));
1169 rsc = 1;
1170 prom_getprop(_prom->root, "#size-cells", &rsc, sizeof(rsc));
1171 prom_debug("root_addr_cells: %x\n", (unsigned long) rac);
1172 prom_debug("root_size_cells: %x\n", (unsigned long) rsc);
1173
1174 prom_debug("scanning memory:\n");
1175 path = RELOC(prom_scratch);
1176
1177 for (node = 0; prom_next_node(&node); ) {
1178 type[0] = 0;
1179 prom_getprop(node, "device_type", type, sizeof(type));
1180
1181 if (type[0] == 0) {
1182 /*
1183 * CHRP Longtrail machines have no device_type
1184 * on the memory node, so check the name instead...
1185 */
1186 prom_getprop(node, "name", type, sizeof(type));
1187 }
1188 if (strcmp(type, RELOC("memory")))
1189 continue;
1190
1191 plen = prom_getprop(node, "reg", RELOC(regbuf), sizeof(regbuf));
1192 if (plen > sizeof(regbuf)) {
1193 prom_printf("memory node too large for buffer !\n");
1194 plen = sizeof(regbuf);
1195 }
1196 p = RELOC(regbuf);
1197 endp = p + (plen / sizeof(cell_t));
1198
1199#ifdef DEBUG_PROM
1200 memset(path, 0, PROM_SCRATCH_SIZE);
1201 call_prom("package-to-path", 3, 1, node, path, PROM_SCRATCH_SIZE-1);
1202 prom_debug(" node %s :\n", path);
1203#endif /* DEBUG_PROM */
1204
1205 while ((endp - p) >= (rac + rsc)) {
1206 unsigned long base, size;
1207
1208 base = prom_next_cell(rac, &p);
1209 size = prom_next_cell(rsc, &p);
1210
1211 if (size == 0)
1212 continue;
1213 prom_debug(" %x %x\n", base, size);
1214 if (base == 0 && (RELOC(of_platform) & PLATFORM_LPAR))
1215 RELOC(rmo_top) = size;
1216 if ((base + size) > RELOC(ram_top))
1217 RELOC(ram_top) = base + size;
1218 }
1219 }
1220
1221 RELOC(alloc_bottom) = PAGE_ALIGN((unsigned long)&RELOC(_end) + 0x4000);
1222
1223 /* Check if we have an initrd after the kernel, if we do move our bottom
1224 * point to after it
1225 */
1226 if (RELOC(prom_initrd_start)) {
1227 if (RELOC(prom_initrd_end) > RELOC(alloc_bottom))
1228 RELOC(alloc_bottom) = PAGE_ALIGN(RELOC(prom_initrd_end));
1229 }
1230
1231 /*
1232 * If prom_memory_limit is set we reduce the upper limits *except* for
1233 * alloc_top_high. This must be the real top of RAM so we can put
1234 * TCE's up there.
1235 */
1236
1237 RELOC(alloc_top_high) = RELOC(ram_top);
1238
1239 if (RELOC(prom_memory_limit)) {
1240 if (RELOC(prom_memory_limit) <= RELOC(alloc_bottom)) {
1241 prom_printf("Ignoring mem=%x <= alloc_bottom.\n",
1242 RELOC(prom_memory_limit));
1243 RELOC(prom_memory_limit) = 0;
1244 } else if (RELOC(prom_memory_limit) >= RELOC(ram_top)) {
1245 prom_printf("Ignoring mem=%x >= ram_top.\n",
1246 RELOC(prom_memory_limit));
1247 RELOC(prom_memory_limit) = 0;
1248 } else {
1249 RELOC(ram_top) = RELOC(prom_memory_limit);
1250 RELOC(rmo_top) = min(RELOC(rmo_top), RELOC(prom_memory_limit));
1251 }
1252 }
1253
1254 /*
1255 * Setup our top alloc point, that is top of RMO or top of
1256 * segment 0 when running non-LPAR.
1257 * Some RS64 machines have buggy firmware where claims up at
1258 * 1GB fail. Cap at 768MB as a workaround.
1259 * Since 768MB is plenty of room, and we need to cap to something
1260 * reasonable on 32-bit, cap at 768MB on all machines.
1261 */
1262 if (!RELOC(rmo_top))
1263 RELOC(rmo_top) = RELOC(ram_top);
1264 RELOC(rmo_top) = min(0x30000000ul, RELOC(rmo_top));
1265 RELOC(alloc_top) = RELOC(rmo_top);
1266 RELOC(alloc_top_high) = RELOC(ram_top);
1267
1268 prom_printf("memory layout at init:\n");
1269 prom_printf(" memory_limit : %x (16 MB aligned)\n", RELOC(prom_memory_limit));
1270 prom_printf(" alloc_bottom : %x\n", RELOC(alloc_bottom));
1271 prom_printf(" alloc_top : %x\n", RELOC(alloc_top));
1272 prom_printf(" alloc_top_hi : %x\n", RELOC(alloc_top_high));
1273 prom_printf(" rmo_top : %x\n", RELOC(rmo_top));
1274 prom_printf(" ram_top : %x\n", RELOC(ram_top));
1275}
1276
1277
1278/*
1279 * Allocate room for and instantiate RTAS
1280 */
1281static void __init prom_instantiate_rtas(void)
1282{
1283 phandle rtas_node;
1284 ihandle rtas_inst;
1285 u32 base, entry = 0;
1286 u32 size = 0;
1287
1288 prom_debug("prom_instantiate_rtas: start...\n");
1289
1290 rtas_node = call_prom("finddevice", 1, 1, ADDR("/rtas"));
1291 prom_debug("rtas_node: %x\n", rtas_node);
1292 if (!PHANDLE_VALID(rtas_node))
1293 return;
1294
1295 prom_getprop(rtas_node, "rtas-size", &size, sizeof(size));
1296 if (size == 0)
1297 return;
1298
1299 base = alloc_down(size, PAGE_SIZE, 0);
1300 if (base == 0) {
1301 prom_printf("RTAS allocation failed !\n");
1302 return;
1303 }
1304
1305 rtas_inst = call_prom("open", 1, 1, ADDR("/rtas"));
1306 if (!IHANDLE_VALID(rtas_inst)) {
1307 prom_printf("opening rtas package failed (%x)\n", rtas_inst);
1308 return;
1309 }
1310
1311 prom_printf("instantiating rtas at 0x%x...", base);
1312
1313 if (call_prom_ret("call-method", 3, 2, &entry,
1314 ADDR("instantiate-rtas"),
1315 rtas_inst, base) != 0
1316 || entry == 0) {
1317 prom_printf(" failed\n");
1318 return;
1319 }
1320 prom_printf(" done\n");
1321
1322 reserve_mem(base, size);
1323
1324 prom_setprop(rtas_node, "/rtas", "linux,rtas-base",
1325 &base, sizeof(base));
1326 prom_setprop(rtas_node, "/rtas", "linux,rtas-entry",
1327 &entry, sizeof(entry));
1328
1329 prom_debug("rtas base = 0x%x\n", base);
1330 prom_debug("rtas entry = 0x%x\n", entry);
1331 prom_debug("rtas size = 0x%x\n", (long)size);
1332
1333 prom_debug("prom_instantiate_rtas: end...\n");
1334}
1335
1336#ifdef CONFIG_PPC64
1337/*
1338 * Allocate room for and initialize TCE tables
1339 */
1340static void __init prom_initialize_tce_table(void)
1341{
1342 phandle node;
1343 ihandle phb_node;
1344 char compatible[64], type[64], model[64];
1345 char *path = RELOC(prom_scratch);
1346 u64 base, align;
1347 u32 minalign, minsize;
1348 u64 tce_entry, *tce_entryp;
1349 u64 local_alloc_top, local_alloc_bottom;
1350 u64 i;
1351
1352 if (RELOC(prom_iommu_off))
1353 return;
1354
1355 prom_debug("starting prom_initialize_tce_table\n");
1356
1357 /* Cache current top of allocs so we reserve a single block */
1358 local_alloc_top = RELOC(alloc_top_high);
1359 local_alloc_bottom = local_alloc_top;
1360
1361 /* Search all nodes looking for PHBs. */
1362 for (node = 0; prom_next_node(&node); ) {
1363 compatible[0] = 0;
1364 type[0] = 0;
1365 model[0] = 0;
1366 prom_getprop(node, "compatible",
1367 compatible, sizeof(compatible));
1368 prom_getprop(node, "device_type", type, sizeof(type));
1369 prom_getprop(node, "model", model, sizeof(model));
1370
1371 if ((type[0] == 0) || (strstr(type, RELOC("pci")) == NULL))
1372 continue;
1373
1374 /* Keep the old logic intact to avoid regression. */
1375 if (compatible[0] != 0) {
1376 if ((strstr(compatible, RELOC("python")) == NULL) &&
1377 (strstr(compatible, RELOC("Speedwagon")) == NULL) &&
1378 (strstr(compatible, RELOC("Winnipeg")) == NULL))
1379 continue;
1380 } else if (model[0] != 0) {
1381 if ((strstr(model, RELOC("ython")) == NULL) &&
1382 (strstr(model, RELOC("peedwagon")) == NULL) &&
1383 (strstr(model, RELOC("innipeg")) == NULL))
1384 continue;
1385 }
1386
1387 if (prom_getprop(node, "tce-table-minalign", &minalign,
1388 sizeof(minalign)) == PROM_ERROR)
1389 minalign = 0;
1390 if (prom_getprop(node, "tce-table-minsize", &minsize,
1391 sizeof(minsize)) == PROM_ERROR)
1392 minsize = 4UL << 20;
1393
1394 /*
1395 * Even though we read what OF wants, we just set the table
1396 * size to 4 MB. This is enough to map 2GB of PCI DMA space.
1397 * By doing this, we avoid the pitfalls of trying to DMA to
1398 * MMIO space and the DMA alias hole.
1399 *
1400 * On POWER4, firmware sets the TCE region by assuming
1401 * each TCE table is 8MB. Using this memory for anything
1402 * else will impact performance, so we always allocate 8MB.
1403 * Anton
1404 */
1405 if (__is_processor(PV_POWER4) || __is_processor(PV_POWER4p))
1406 minsize = 8UL << 20;
1407 else
1408 minsize = 4UL << 20;
1409
1410 /* Align to the greater of the align or size */
1411 align = max(minalign, minsize);
1412 base = alloc_down(minsize, align, 1);
1413 if (base == 0)
1414 prom_panic("ERROR, cannot find space for TCE table.\n");
1415 if (base < local_alloc_bottom)
1416 local_alloc_bottom = base;
1417
1418 /* It seems OF doesn't null-terminate the path :-( */
1419 memset(path, 0, PROM_SCRATCH_SIZE);
1420 /* Call OF to setup the TCE hardware */
1421 if (call_prom("package-to-path", 3, 1, node,
1422 path, PROM_SCRATCH_SIZE-1) == PROM_ERROR) {
1423 prom_printf("package-to-path failed\n");
1424 }
1425
1426 /* Save away the TCE table attributes for later use. */
1427 prom_setprop(node, path, "linux,tce-base", &base, sizeof(base));
1428 prom_setprop(node, path, "linux,tce-size", &minsize, sizeof(minsize));
1429
1430 prom_debug("TCE table: %s\n", path);
1431 prom_debug("\tnode = 0x%x\n", node);
1432 prom_debug("\tbase = 0x%x\n", base);
1433 prom_debug("\tsize = 0x%x\n", minsize);
1434
1435 /* Initialize the table to have a one-to-one mapping
1436 * over the allocated size.
1437 */
1438 tce_entryp = (u64 *)base;
1439 for (i = 0; i < (minsize >> 3) ;tce_entryp++, i++) {
1440 tce_entry = (i << PAGE_SHIFT);
1441 tce_entry |= 0x3;
1442 *tce_entryp = tce_entry;
1443 }
1444
1445 prom_printf("opening PHB %s", path);
1446 phb_node = call_prom("open", 1, 1, path);
1447 if (phb_node == 0)
1448 prom_printf("... failed\n");
1449 else
1450 prom_printf("... done\n");
1451
1452 call_prom("call-method", 6, 0, ADDR("set-64-bit-addressing"),
1453 phb_node, -1, minsize,
1454 (u32) base, (u32) (base >> 32));
1455 call_prom("close", 1, 0, phb_node);
1456 }
1457
1458 reserve_mem(local_alloc_bottom, local_alloc_top - local_alloc_bottom);
1459
1460 /* These are only really needed if there is a memory limit in
1461 * effect, but we don't know so export them always. */
1462 RELOC(prom_tce_alloc_start) = local_alloc_bottom;
1463 RELOC(prom_tce_alloc_end) = local_alloc_top;
1464
1465 /* Flag the first invalid entry */
1466 prom_debug("ending prom_initialize_tce_table\n");
1467}
1468#endif
1469
1470/*
1471 * With CHRP SMP we need to use the OF to start the other processors.
1472 * We can't wait until smp_boot_cpus (the OF is trashed by then)
1473 * so we have to put the processors into a holding pattern controlled
1474 * by the kernel (not OF) before we destroy the OF.
1475 *
1476 * This uses a chunk of low memory, puts some holding pattern
1477 * code there and sends the other processors off to there until
1478 * smp_boot_cpus tells them to do something. The holding pattern
1479 * checks that address until its cpu # is there, when it is that
1480 * cpu jumps to __secondary_start(). smp_boot_cpus() takes care
1481 * of setting those values.
1482 *
1483 * We also use physical address 0x4 here to tell when a cpu
1484 * is in its holding pattern code.
1485 *
1486 * -- Cort
1487 */
1488/*
1489 * We want to reference the copy of __secondary_hold_* in the
1490 * 0 - 0x100 address range
1491 */
1492#define LOW_ADDR(x) (((unsigned long) &(x)) & 0xff)
1493
1494static void __init prom_hold_cpus(void)
1495{
1496 unsigned long i;
1497 unsigned int reg;
1498 phandle node;
1499 char type[64];
1500 struct prom_t *_prom = &RELOC(prom);
1501 unsigned long *spinloop
1502 = (void *) LOW_ADDR(__secondary_hold_spinloop);
1503 unsigned long *acknowledge
1504 = (void *) LOW_ADDR(__secondary_hold_acknowledge);
1505 unsigned long secondary_hold = LOW_ADDR(__secondary_hold);
1506
1507 prom_debug("prom_hold_cpus: start...\n");
1508 prom_debug(" 1) spinloop = 0x%x\n", (unsigned long)spinloop);
1509 prom_debug(" 1) *spinloop = 0x%x\n", *spinloop);
1510 prom_debug(" 1) acknowledge = 0x%x\n",
1511 (unsigned long)acknowledge);
1512 prom_debug(" 1) *acknowledge = 0x%x\n", *acknowledge);
1513 prom_debug(" 1) secondary_hold = 0x%x\n", secondary_hold);
1514
1515 /* Set the common spinloop variable, so all of the secondary cpus
1516 * will block when they are awakened from their OF spinloop.
1517 * This must occur for both SMP and non SMP kernels, since OF will
1518 * be trashed when we move the kernel.
1519 */
1520 *spinloop = 0;
1521
1522 /* look for cpus */
1523 for (node = 0; prom_next_node(&node); ) {
1524 type[0] = 0;
1525 prom_getprop(node, "device_type", type, sizeof(type));
1526 if (strcmp(type, RELOC("cpu")) != 0)
1527 continue;
1528
1529 /* Skip non-configured cpus. */
1530 if (prom_getprop(node, "status", type, sizeof(type)) > 0)
1531 if (strcmp(type, RELOC("okay")) != 0)
1532 continue;
1533
1534 reg = -1;
1535 prom_getprop(node, "reg", ®, sizeof(reg));
1536
1537 prom_debug("cpu hw idx = %lu\n", reg);
1538
1539 /* Init the acknowledge var which will be reset by
1540 * the secondary cpu when it awakens from its OF
1541 * spinloop.
1542 */
1543 *acknowledge = (unsigned long)-1;
1544
1545 if (reg != _prom->cpu) {
1546 /* Primary Thread of non-boot cpu */
1547 prom_printf("starting cpu hw idx %lu... ", reg);
1548 call_prom("start-cpu", 3, 0, node,
1549 secondary_hold, reg);
1550
1551 for (i = 0; (i < 100000000) &&
1552 (*acknowledge == ((unsigned long)-1)); i++ )
1553 mb();
1554
1555 if (*acknowledge == reg)
1556 prom_printf("done\n");
1557 else
1558 prom_printf("failed: %x\n", *acknowledge);
1559 }
1560#ifdef CONFIG_SMP
1561 else
1562 prom_printf("boot cpu hw idx %lu\n", reg);
1563#endif /* CONFIG_SMP */
1564 }
1565
1566 prom_debug("prom_hold_cpus: end...\n");
1567}
1568
1569
1570static void __init prom_init_client_services(unsigned long pp)
1571{
1572 struct prom_t *_prom = &RELOC(prom);
1573
1574 /* Get a handle to the prom entry point before anything else */
1575 RELOC(prom_entry) = pp;
1576
1577 /* get a handle for the stdout device */
1578 _prom->chosen = call_prom("finddevice", 1, 1, ADDR("/chosen"));
1579 if (!PHANDLE_VALID(_prom->chosen))
1580 prom_panic("cannot find chosen"); /* msg won't be printed :( */
1581
1582 /* get device tree root */
1583 _prom->root = call_prom("finddevice", 1, 1, ADDR("/"));
1584 if (!PHANDLE_VALID(_prom->root))
1585 prom_panic("cannot find device tree root"); /* msg won't be printed :( */
1586
1587 _prom->mmumap = 0;
1588}
1589
1590#ifdef CONFIG_PPC32
1591/*
1592 * For really old powermacs, we need to map things we claim.
1593 * For that, we need the ihandle of the mmu.
1594 * Also, on the longtrail, we need to work around other bugs.
1595 */
1596static void __init prom_find_mmu(void)
1597{
1598 struct prom_t *_prom = &RELOC(prom);
1599 phandle oprom;
1600 char version[64];
1601
1602 oprom = call_prom("finddevice", 1, 1, ADDR("/openprom"));
1603 if (!PHANDLE_VALID(oprom))
1604 return;
1605 if (prom_getprop(oprom, "model", version, sizeof(version)) <= 0)
1606 return;
1607 version[sizeof(version) - 1] = 0;
1608 /* XXX might need to add other versions here */
1609 if (strcmp(version, "Open Firmware, 1.0.5") == 0)
1610 of_workarounds = OF_WA_CLAIM;
1611 else if (strncmp(version, "FirmWorks,3.", 12) == 0) {
1612 of_workarounds = OF_WA_CLAIM | OF_WA_LONGTRAIL;
1613 call_prom("interpret", 1, 1, "dev /memory 0 to allow-reclaim");
1614 } else
1615 return;
1616 _prom->memory = call_prom("open", 1, 1, ADDR("/memory"));
1617 prom_getprop(_prom->chosen, "mmu", &_prom->mmumap,
1618 sizeof(_prom->mmumap));
1619 if (!IHANDLE_VALID(_prom->memory) || !IHANDLE_VALID(_prom->mmumap))
1620 of_workarounds &= ~OF_WA_CLAIM; /* hmmm */
1621}
1622#else
1623#define prom_find_mmu()
1624#endif
1625
1626static void __init prom_init_stdout(void)
1627{
1628 struct prom_t *_prom = &RELOC(prom);
1629 char *path = RELOC(of_stdout_device);
1630 char type[16];
1631 u32 val;
1632
1633 if (prom_getprop(_prom->chosen, "stdout", &val, sizeof(val)) <= 0)
1634 prom_panic("cannot find stdout");
1635
1636 _prom->stdout = val;
1637
1638 /* Get the full OF pathname of the stdout device */
1639 memset(path, 0, 256);
1640 call_prom("instance-to-path", 3, 1, _prom->stdout, path, 255);
1641 val = call_prom("instance-to-package", 1, 1, _prom->stdout);
1642 prom_setprop(_prom->chosen, "/chosen", "linux,stdout-package",
1643 &val, sizeof(val));
1644 prom_printf("OF stdout device is: %s\n", RELOC(of_stdout_device));
1645 prom_setprop(_prom->chosen, "/chosen", "linux,stdout-path",
1646 path, strlen(path) + 1);
1647
1648 /* If it's a display, note it */
1649 memset(type, 0, sizeof(type));
1650 prom_getprop(val, "device_type", type, sizeof(type));
1651 if (strcmp(type, RELOC("display")) == 0)
1652 prom_setprop(val, path, "linux,boot-display", NULL, 0);
1653}
1654
1655static void __init prom_close_stdin(void)
1656{
1657 struct prom_t *_prom = &RELOC(prom);
1658 ihandle val;
1659
1660 if (prom_getprop(_prom->chosen, "stdin", &val, sizeof(val)) > 0)
1661 call_prom("close", 1, 0, val);
1662}
1663
1664static int __init prom_find_machine_type(void)
1665{
1666 struct prom_t *_prom = &RELOC(prom);
1667 char compat[256];
1668 int len, i = 0;
1669#ifdef CONFIG_PPC64
1670 phandle rtas;
1671 int x;
1672#endif
1673
1674 /* Look for a PowerMac */
1675 len = prom_getprop(_prom->root, "compatible",
1676 compat, sizeof(compat)-1);
1677 if (len > 0) {
1678 compat[len] = 0;
1679 while (i < len) {
1680 char *p = &compat[i];
1681 int sl = strlen(p);
1682 if (sl == 0)
1683 break;
1684 if (strstr(p, RELOC("Power Macintosh")) ||
1685 strstr(p, RELOC("MacRISC")))
1686 return PLATFORM_POWERMAC;
1687#ifdef CONFIG_PPC64
1688 /* We must make sure we don't detect the IBM Cell
1689 * blades as pSeries due to some firmware issues,
1690 * so we do it here.
1691 */
1692 if (strstr(p, RELOC("IBM,CBEA")) ||
1693 strstr(p, RELOC("IBM,CPBW-1.0")))
1694 return PLATFORM_GENERIC;
1695#endif /* CONFIG_PPC64 */
1696 i += sl + 1;
1697 }
1698 }
1699#ifdef CONFIG_PPC64
1700 /* If not a mac, try to figure out if it's an IBM pSeries or any other
1701 * PAPR compliant platform. We assume it is if :
1702 * - /device_type is "chrp" (please, do NOT use that for future
1703 * non-IBM designs !
1704 * - it has /rtas
1705 */
1706 len = prom_getprop(_prom->root, "device_type",
1707 compat, sizeof(compat)-1);
1708 if (len <= 0)
1709 return PLATFORM_GENERIC;
1710 if (strcmp(compat, RELOC("chrp")))
1711 return PLATFORM_GENERIC;
1712
1713 /* Default to pSeries. We need to know if we are running LPAR */
1714 rtas = call_prom("finddevice", 1, 1, ADDR("/rtas"));
1715 if (!PHANDLE_VALID(rtas))
1716 return PLATFORM_GENERIC;
1717 x = prom_getproplen(rtas, "ibm,hypertas-functions");
1718 if (x != PROM_ERROR) {
1719 prom_debug("Hypertas detected, assuming LPAR !\n");
1720 return PLATFORM_PSERIES_LPAR;
1721 }
1722 return PLATFORM_PSERIES;
1723#else
1724 return PLATFORM_GENERIC;
1725#endif
1726}
1727
1728static int __init prom_set_color(ihandle ih, int i, int r, int g, int b)
1729{
1730 return call_prom("call-method", 6, 1, ADDR("color!"), ih, i, b, g, r);
1731}
1732
1733/*
1734 * If we have a display that we don't know how to drive,
1735 * we will want to try to execute OF's open method for it
1736 * later. However, OF will probably fall over if we do that
1737 * we've taken over the MMU.
1738 * So we check whether we will need to open the display,
1739 * and if so, open it now.
1740 */
1741static void __init prom_check_displays(void)
1742{
1743 char type[16], *path;
1744 phandle node;
1745 ihandle ih;
1746 int i;
1747
1748 static unsigned char default_colors[] = {
1749 0x00, 0x00, 0x00,
1750 0x00, 0x00, 0xaa,
1751 0x00, 0xaa, 0x00,
1752 0x00, 0xaa, 0xaa,
1753 0xaa, 0x00, 0x00,
1754 0xaa, 0x00, 0xaa,
1755 0xaa, 0xaa, 0x00,
1756 0xaa, 0xaa, 0xaa,
1757 0x55, 0x55, 0x55,
1758 0x55, 0x55, 0xff,
1759 0x55, 0xff, 0x55,
1760 0x55, 0xff, 0xff,
1761 0xff, 0x55, 0x55,
1762 0xff, 0x55, 0xff,
1763 0xff, 0xff, 0x55,
1764 0xff, 0xff, 0xff
1765 };
1766 const unsigned char *clut;
1767
1768 prom_debug("Looking for displays\n");
1769 for (node = 0; prom_next_node(&node); ) {
1770 memset(type, 0, sizeof(type));
1771 prom_getprop(node, "device_type", type, sizeof(type));
1772 if (strcmp(type, RELOC("display")) != 0)
1773 continue;
1774
1775 /* It seems OF doesn't null-terminate the path :-( */
1776 path = RELOC(prom_scratch);
1777 memset(path, 0, PROM_SCRATCH_SIZE);
1778
1779 /*
1780 * leave some room at the end of the path for appending extra
1781 * arguments
1782 */
1783 if (call_prom("package-to-path", 3, 1, node, path,
1784 PROM_SCRATCH_SIZE-10) == PROM_ERROR)
1785 continue;
1786 prom_printf("found display : %s, opening... ", path);
1787
1788 ih = call_prom("open", 1, 1, path);
1789 if (ih == 0) {
1790 prom_printf("failed\n");
1791 continue;
1792 }
1793
1794 /* Success */
1795 prom_printf("done\n");
1796 prom_setprop(node, path, "linux,opened", NULL, 0);
1797
1798 /* Setup a usable color table when the appropriate
1799 * method is available. Should update this to set-colors */
1800 clut = RELOC(default_colors);
1801 for (i = 0; i < 32; i++, clut += 3)
1802 if (prom_set_color(ih, i, clut[0], clut[1],
1803 clut[2]) != 0)
1804 break;
1805
1806#ifdef CONFIG_LOGO_LINUX_CLUT224
1807 clut = PTRRELOC(RELOC(logo_linux_clut224.clut));
1808 for (i = 0; i < RELOC(logo_linux_clut224.clutsize); i++, clut += 3)
1809 if (prom_set_color(ih, i + 32, clut[0], clut[1],
1810 clut[2]) != 0)
1811 break;
1812#endif /* CONFIG_LOGO_LINUX_CLUT224 */
1813 }
1814}
1815
1816
1817/* Return (relocated) pointer to this much memory: moves initrd if reqd. */
1818static void __init *make_room(unsigned long *mem_start, unsigned long *mem_end,
1819 unsigned long needed, unsigned long align)
1820{
1821 void *ret;
1822
1823 *mem_start = _ALIGN(*mem_start, align);
1824 while ((*mem_start + needed) > *mem_end) {
1825 unsigned long room, chunk;
1826
1827 prom_debug("Chunk exhausted, claiming more at %x...\n",
1828 RELOC(alloc_bottom));
1829 room = RELOC(alloc_top) - RELOC(alloc_bottom);
1830 if (room > DEVTREE_CHUNK_SIZE)
1831 room = DEVTREE_CHUNK_SIZE;
1832 if (room < PAGE_SIZE)
1833 prom_panic("No memory for flatten_device_tree "
1834 "(no room)\n");
1835 chunk = alloc_up(room, 0);
1836 if (chunk == 0)
1837 prom_panic("No memory for flatten_device_tree "
1838 "(claim failed)\n");
1839 *mem_end = chunk + room;
1840 }
1841
1842 ret = (void *)*mem_start;
1843 *mem_start += needed;
1844
1845 return ret;
1846}
1847
1848#define dt_push_token(token, mem_start, mem_end) \
1849 do { *((u32 *)make_room(mem_start, mem_end, 4, 4)) = token; } while(0)
1850
1851static unsigned long __init dt_find_string(char *str)
1852{
1853 char *s, *os;
1854
1855 s = os = (char *)RELOC(dt_string_start);
1856 s += 4;
1857 while (s < (char *)RELOC(dt_string_end)) {
1858 if (strcmp(s, str) == 0)
1859 return s - os;
1860 s += strlen(s) + 1;
1861 }
1862 return 0;
1863}
1864
1865/*
1866 * The Open Firmware 1275 specification states properties must be 31 bytes or
1867 * less, however not all firmwares obey this. Make it 64 bytes to be safe.
1868 */
1869#define MAX_PROPERTY_NAME 64
1870
1871static void __init scan_dt_build_strings(phandle node,
1872 unsigned long *mem_start,
1873 unsigned long *mem_end)
1874{
1875 char *prev_name, *namep, *sstart;
1876 unsigned long soff;
1877 phandle child;
1878
1879 sstart = (char *)RELOC(dt_string_start);
1880
1881 /* get and store all property names */
1882 prev_name = RELOC("");
1883 for (;;) {
1884 /* 64 is max len of name including nul. */
1885 namep = make_room(mem_start, mem_end, MAX_PROPERTY_NAME, 1);
1886 if (call_prom("nextprop", 3, 1, node, prev_name, namep) != 1) {
1887 /* No more nodes: unwind alloc */
1888 *mem_start = (unsigned long)namep;
1889 break;
1890 }
1891
1892 /* skip "name" */
1893 if (strcmp(namep, RELOC("name")) == 0) {
1894 *mem_start = (unsigned long)namep;
1895 prev_name = RELOC("name");
1896 continue;
1897 }
1898 /* get/create string entry */
1899 soff = dt_find_string(namep);
1900 if (soff != 0) {
1901 *mem_start = (unsigned long)namep;
1902 namep = sstart + soff;
1903 } else {
1904 /* Trim off some if we can */
1905 *mem_start = (unsigned long)namep + strlen(namep) + 1;
1906 RELOC(dt_string_end) = *mem_start;
1907 }
1908 prev_name = namep;
1909 }
1910
1911 /* do all our children */
1912 child = call_prom("child", 1, 1, node);
1913 while (child != 0) {
1914 scan_dt_build_strings(child, mem_start, mem_end);
1915 child = call_prom("peer", 1, 1, child);
1916 }
1917}
1918
1919static void __init scan_dt_build_struct(phandle node, unsigned long *mem_start,
1920 unsigned long *mem_end)
1921{
1922 phandle child;
1923 char *namep, *prev_name, *sstart, *p, *ep, *lp, *path;
1924 unsigned long soff;
1925 unsigned char *valp;
1926 static char pname[MAX_PROPERTY_NAME];
1927 int l, room;
1928
1929 dt_push_token(OF_DT_BEGIN_NODE, mem_start, mem_end);
1930
1931 /* get the node's full name */
1932 namep = (char *)*mem_start;
1933 room = *mem_end - *mem_start;
1934 if (room > 255)
1935 room = 255;
1936 l = call_prom("package-to-path", 3, 1, node, namep, room);
1937 if (l >= 0) {
1938 /* Didn't fit? Get more room. */
1939 if (l >= room) {
1940 if (l >= *mem_end - *mem_start)
1941 namep = make_room(mem_start, mem_end, l+1, 1);
1942 call_prom("package-to-path", 3, 1, node, namep, l);
1943 }
1944 namep[l] = '\0';
1945
1946 /* Fixup an Apple bug where they have bogus \0 chars in the
1947 * middle of the path in some properties, and extract
1948 * the unit name (everything after the last '/').
1949 */
1950 for (lp = p = namep, ep = namep + l; p < ep; p++) {
1951 if (*p == '/')
1952 lp = namep;
1953 else if (*p != 0)
1954 *lp++ = *p;
1955 }
1956 *lp = 0;
1957 *mem_start = _ALIGN((unsigned long)lp + 1, 4);
1958 }
1959
1960 /* get it again for debugging */
1961 path = RELOC(prom_scratch);
1962 memset(path, 0, PROM_SCRATCH_SIZE);
1963 call_prom("package-to-path", 3, 1, node, path, PROM_SCRATCH_SIZE-1);
1964
1965 /* get and store all properties */
1966 prev_name = RELOC("");
1967 sstart = (char *)RELOC(dt_string_start);
1968 for (;;) {
1969 if (call_prom("nextprop", 3, 1, node, prev_name,
1970 RELOC(pname)) != 1)
1971 break;
1972
1973 /* skip "name" */
1974 if (strcmp(RELOC(pname), RELOC("name")) == 0) {
1975 prev_name = RELOC("name");
1976 continue;
1977 }
1978
1979 /* find string offset */
1980 soff = dt_find_string(RELOC(pname));
1981 if (soff == 0) {
1982 prom_printf("WARNING: Can't find string index for"
1983 " <%s>, node %s\n", RELOC(pname), path);
1984 break;
1985 }
1986 prev_name = sstart + soff;
1987
1988 /* get length */
1989 l = call_prom("getproplen", 2, 1, node, RELOC(pname));
1990
1991 /* sanity checks */
1992 if (l == PROM_ERROR)
1993 continue;
1994 if (l > MAX_PROPERTY_LENGTH) {
1995 prom_printf("WARNING: ignoring large property ");
1996 /* It seems OF doesn't null-terminate the path :-( */
1997 prom_printf("[%s] ", path);
1998 prom_printf("%s length 0x%x\n", RELOC(pname), l);
1999 continue;
2000 }
2001
2002 /* push property head */
2003 dt_push_token(OF_DT_PROP, mem_start, mem_end);
2004 dt_push_token(l, mem_start, mem_end);
2005 dt_push_token(soff, mem_start, mem_end);
2006
2007 /* push property content */
2008 valp = make_room(mem_start, mem_end, l, 4);
2009 call_prom("getprop", 4, 1, node, RELOC(pname), valp, l);
2010 *mem_start = _ALIGN(*mem_start, 4);
2011 }
2012
2013 /* Add a "linux,phandle" property. */
2014 soff = dt_find_string(RELOC("linux,phandle"));
2015 if (soff == 0)
2016 prom_printf("WARNING: Can't find string index for"
2017 " <linux-phandle> node %s\n", path);
2018 else {
2019 dt_push_token(OF_DT_PROP, mem_start, mem_end);
2020 dt_push_token(4, mem_start, mem_end);
2021 dt_push_token(soff, mem_start, mem_end);
2022 valp = make_room(mem_start, mem_end, 4, 4);
2023 *(u32 *)valp = node;
2024 }
2025
2026 /* do all our children */
2027 child = call_prom("child", 1, 1, node);
2028 while (child != 0) {
2029 scan_dt_build_struct(child, mem_start, mem_end);
2030 child = call_prom("peer", 1, 1, child);
2031 }
2032
2033 dt_push_token(OF_DT_END_NODE, mem_start, mem_end);
2034}
2035
2036static void __init flatten_device_tree(void)
2037{
2038 phandle root;
2039 unsigned long mem_start, mem_end, room;
2040 struct boot_param_header *hdr;
2041 struct prom_t *_prom = &RELOC(prom);
2042 char *namep;
2043 u64 *rsvmap;
2044
2045 /*
2046 * Check how much room we have between alloc top & bottom (+/- a
2047 * few pages), crop to 1MB, as this is our "chunk" size
2048 */
2049 room = RELOC(alloc_top) - RELOC(alloc_bottom) - 0x4000;
2050 if (room > DEVTREE_CHUNK_SIZE)
2051 room = DEVTREE_CHUNK_SIZE;
2052 prom_debug("starting device tree allocs at %x\n", RELOC(alloc_bottom));
2053
2054 /* Now try to claim that */
2055 mem_start = (unsigned long)alloc_up(room, PAGE_SIZE);
2056 if (mem_start == 0)
2057 prom_panic("Can't allocate initial device-tree chunk\n");
2058 mem_end = mem_start + room;
2059
2060 /* Get root of tree */
2061 root = call_prom("peer", 1, 1, (phandle)0);
2062 if (root == (phandle)0)
2063 prom_panic ("couldn't get device tree root\n");
2064
2065 /* Build header and make room for mem rsv map */
2066 mem_start = _ALIGN(mem_start, 4);
2067 hdr = make_room(&mem_start, &mem_end,
2068 sizeof(struct boot_param_header), 4);
2069 RELOC(dt_header_start) = (unsigned long)hdr;
2070 rsvmap = make_room(&mem_start, &mem_end, sizeof(mem_reserve_map), 8);
2071
2072 /* Start of strings */
2073 mem_start = PAGE_ALIGN(mem_start);
2074 RELOC(dt_string_start) = mem_start;
2075 mem_start += 4; /* hole */
2076
2077 /* Add "linux,phandle" in there, we'll need it */
2078 namep = make_room(&mem_start, &mem_end, 16, 1);
2079 strcpy(namep, RELOC("linux,phandle"));
2080 mem_start = (unsigned long)namep + strlen(namep) + 1;
2081
2082 /* Build string array */
2083 prom_printf("Building dt strings...\n");
2084 scan_dt_build_strings(root, &mem_start, &mem_end);
2085 RELOC(dt_string_end) = mem_start;
2086
2087 /* Build structure */
2088 mem_start = PAGE_ALIGN(mem_start);
2089 RELOC(dt_struct_start) = mem_start;
2090 prom_printf("Building dt structure...\n");
2091 scan_dt_build_struct(root, &mem_start, &mem_end);
2092 dt_push_token(OF_DT_END, &mem_start, &mem_end);
2093 RELOC(dt_struct_end) = PAGE_ALIGN(mem_start);
2094
2095 /* Finish header */
2096 hdr->boot_cpuid_phys = _prom->cpu;
2097 hdr->magic = OF_DT_HEADER;
2098 hdr->totalsize = RELOC(dt_struct_end) - RELOC(dt_header_start);
2099 hdr->off_dt_struct = RELOC(dt_struct_start) - RELOC(dt_header_start);
2100 hdr->off_dt_strings = RELOC(dt_string_start) - RELOC(dt_header_start);
2101 hdr->dt_strings_size = RELOC(dt_string_end) - RELOC(dt_string_start);
2102 hdr->off_mem_rsvmap = ((unsigned long)rsvmap) - RELOC(dt_header_start);
2103 hdr->version = OF_DT_VERSION;
2104 /* Version 16 is not backward compatible */
2105 hdr->last_comp_version = 0x10;
2106
2107 /* Copy the reserve map in */
2108 memcpy(rsvmap, RELOC(mem_reserve_map), sizeof(mem_reserve_map));
2109
2110#ifdef DEBUG_PROM
2111 {
2112 int i;
2113 prom_printf("reserved memory map:\n");
2114 for (i = 0; i < RELOC(mem_reserve_cnt); i++)
2115 prom_printf(" %x - %x\n",
2116 RELOC(mem_reserve_map)[i].base,
2117 RELOC(mem_reserve_map)[i].size);
2118 }
2119#endif
2120 /* Bump mem_reserve_cnt to cause further reservations to fail
2121 * since it's too late.
2122 */
2123 RELOC(mem_reserve_cnt) = MEM_RESERVE_MAP_SIZE;
2124
2125 prom_printf("Device tree strings 0x%x -> 0x%x\n",
2126 RELOC(dt_string_start), RELOC(dt_string_end));
2127 prom_printf("Device tree struct 0x%x -> 0x%x\n",
2128 RELOC(dt_struct_start), RELOC(dt_struct_end));
2129
2130}
2131
2132#ifdef CONFIG_PPC_MAPLE
2133/* PIBS Version 1.05.0000 04/26/2005 has an incorrect /ht/isa/ranges property.
2134 * The values are bad, and it doesn't even have the right number of cells. */
2135static void __init fixup_device_tree_maple(void)
2136{
2137 phandle isa;
2138 u32 rloc = 0x01002000; /* IO space; PCI device = 4 */
2139 u32 isa_ranges[6];
2140 char *name;
2141
2142 name = "/ht@0/isa@4";
2143 isa = call_prom("finddevice", 1, 1, ADDR(name));
2144 if (!PHANDLE_VALID(isa)) {
2145 name = "/ht@0/isa@6";
2146 isa = call_prom("finddevice", 1, 1, ADDR(name));
2147 rloc = 0x01003000; /* IO space; PCI device = 6 */
2148 }
2149 if (!PHANDLE_VALID(isa))
2150 return;
2151
2152 if (prom_getproplen(isa, "ranges") != 12)
2153 return;
2154 if (prom_getprop(isa, "ranges", isa_ranges, sizeof(isa_ranges))
2155 == PROM_ERROR)
2156 return;
2157
2158 if (isa_ranges[0] != 0x1 ||
2159 isa_ranges[1] != 0xf4000000 ||
2160 isa_ranges[2] != 0x00010000)
2161 return;
2162
2163 prom_printf("Fixing up bogus ISA range on Maple/Apache...\n");
2164
2165 isa_ranges[0] = 0x1;
2166 isa_ranges[1] = 0x0;
2167 isa_ranges[2] = rloc;
2168 isa_ranges[3] = 0x0;
2169 isa_ranges[4] = 0x0;
2170 isa_ranges[5] = 0x00010000;
2171 prom_setprop(isa, name, "ranges",
2172 isa_ranges, sizeof(isa_ranges));
2173}
2174
2175#define CPC925_MC_START 0xf8000000
2176#define CPC925_MC_LENGTH 0x1000000
2177/* The values for memory-controller don't have right number of cells */
2178static void __init fixup_device_tree_maple_memory_controller(void)
2179{
2180 phandle mc;
2181 u32 mc_reg[4];
2182 char *name = "/hostbridge@f8000000";
2183 struct prom_t *_prom = &RELOC(prom);
2184 u32 ac, sc;
2185
2186 mc = call_prom("finddevice", 1, 1, ADDR(name));
2187 if (!PHANDLE_VALID(mc))
2188 return;
2189
2190 if (prom_getproplen(mc, "reg") != 8)
2191 return;
2192
2193 prom_getprop(_prom->root, "#address-cells", &ac, sizeof(ac));
2194 prom_getprop(_prom->root, "#size-cells", &sc, sizeof(sc));
2195 if ((ac != 2) || (sc != 2))
2196 return;
2197
2198 if (prom_getprop(mc, "reg", mc_reg, sizeof(mc_reg)) == PROM_ERROR)
2199 return;
2200
2201 if (mc_reg[0] != CPC925_MC_START || mc_reg[1] != CPC925_MC_LENGTH)
2202 return;
2203
2204 prom_printf("Fixing up bogus hostbridge on Maple...\n");
2205
2206 mc_reg[0] = 0x0;
2207 mc_reg[1] = CPC925_MC_START;
2208 mc_reg[2] = 0x0;
2209 mc_reg[3] = CPC925_MC_LENGTH;
2210 prom_setprop(mc, name, "reg", mc_reg, sizeof(mc_reg));
2211}
2212#else
2213#define fixup_device_tree_maple()
2214#define fixup_device_tree_maple_memory_controller()
2215#endif
2216
2217#ifdef CONFIG_PPC_CHRP
2218/*
2219 * Pegasos and BriQ lacks the "ranges" property in the isa node
2220 * Pegasos needs decimal IRQ 14/15, not hexadecimal
2221 * Pegasos has the IDE configured in legacy mode, but advertised as native
2222 */
2223static void __init fixup_device_tree_chrp(void)
2224{
2225 phandle ph;
2226 u32 prop[6];
2227 u32 rloc = 0x01006000; /* IO space; PCI device = 12 */
2228 char *name;
2229 int rc;
2230
2231 name = "/pci@80000000/isa@c";
2232 ph = call_prom("finddevice", 1, 1, ADDR(name));
2233 if (!PHANDLE_VALID(ph)) {
2234 name = "/pci@ff500000/isa@6";
2235 ph = call_prom("finddevice", 1, 1, ADDR(name));
2236 rloc = 0x01003000; /* IO space; PCI device = 6 */
2237 }
2238 if (PHANDLE_VALID(ph)) {
2239 rc = prom_getproplen(ph, "ranges");
2240 if (rc == 0 || rc == PROM_ERROR) {
2241 prom_printf("Fixing up missing ISA range on Pegasos...\n");
2242
2243 prop[0] = 0x1;
2244 prop[1] = 0x0;
2245 prop[2] = rloc;
2246 prop[3] = 0x0;
2247 prop[4] = 0x0;
2248 prop[5] = 0x00010000;
2249 prom_setprop(ph, name, "ranges", prop, sizeof(prop));
2250 }
2251 }
2252
2253 name = "/pci@80000000/ide@C,1";
2254 ph = call_prom("finddevice", 1, 1, ADDR(name));
2255 if (PHANDLE_VALID(ph)) {
2256 prom_printf("Fixing up IDE interrupt on Pegasos...\n");
2257 prop[0] = 14;
2258 prop[1] = 0x0;
2259 prom_setprop(ph, name, "interrupts", prop, 2*sizeof(u32));
2260 prom_printf("Fixing up IDE class-code on Pegasos...\n");
2261 rc = prom_getprop(ph, "class-code", prop, sizeof(u32));
2262 if (rc == sizeof(u32)) {
2263 prop[0] &= ~0x5;
2264 prom_setprop(ph, name, "class-code", prop, sizeof(u32));
2265 }
2266 }
2267}
2268#else
2269#define fixup_device_tree_chrp()
2270#endif
2271
2272#if defined(CONFIG_PPC64) && defined(CONFIG_PPC_PMAC)
2273static void __init fixup_device_tree_pmac(void)
2274{
2275 phandle u3, i2c, mpic;
2276 u32 u3_rev;
2277 u32 interrupts[2];
2278 u32 parent;
2279
2280 /* Some G5s have a missing interrupt definition, fix it up here */
2281 u3 = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000"));
2282 if (!PHANDLE_VALID(u3))
2283 return;
2284 i2c = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/i2c@f8001000"));
2285 if (!PHANDLE_VALID(i2c))
2286 return;
2287 mpic = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/mpic@f8040000"));
2288 if (!PHANDLE_VALID(mpic))
2289 return;
2290
2291 /* check if proper rev of u3 */
2292 if (prom_getprop(u3, "device-rev", &u3_rev, sizeof(u3_rev))
2293 == PROM_ERROR)
2294 return;
2295 if (u3_rev < 0x35 || u3_rev > 0x39)
2296 return;
2297 /* does it need fixup ? */
2298 if (prom_getproplen(i2c, "interrupts") > 0)
2299 return;
2300
2301 prom_printf("fixing up bogus interrupts for u3 i2c...\n");
2302
2303 /* interrupt on this revision of u3 is number 0 and level */
2304 interrupts[0] = 0;
2305 interrupts[1] = 1;
2306 prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupts",
2307 &interrupts, sizeof(interrupts));
2308 parent = (u32)mpic;
2309 prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupt-parent",
2310 &parent, sizeof(parent));
2311}
2312#else
2313#define fixup_device_tree_pmac()
2314#endif
2315
2316#ifdef CONFIG_PPC_EFIKA
2317/*
2318 * The MPC5200 FEC driver requires an phy-handle property to tell it how
2319 * to talk to the phy. If the phy-handle property is missing, then this
2320 * function is called to add the appropriate nodes and link it to the
2321 * ethernet node.
2322 */
2323static void __init fixup_device_tree_efika_add_phy(void)
2324{
2325 u32 node;
2326 char prop[64];
2327 int rv;
2328
2329 /* Check if /builtin/ethernet exists - bail if it doesn't */
2330 node = call_prom("finddevice", 1, 1, ADDR("/builtin/ethernet"));
2331 if (!PHANDLE_VALID(node))
2332 return;
2333
2334 /* Check if the phy-handle property exists - bail if it does */
2335 rv = prom_getprop(node, "phy-handle", prop, sizeof(prop));
2336 if (!rv)
2337 return;
2338
2339 /*
2340 * At this point the ethernet device doesn't have a phy described.
2341 * Now we need to add the missing phy node and linkage
2342 */
2343
2344 /* Check for an MDIO bus node - if missing then create one */
2345 node = call_prom("finddevice", 1, 1, ADDR("/builtin/mdio"));
2346 if (!PHANDLE_VALID(node)) {
2347 prom_printf("Adding Ethernet MDIO node\n");
2348 call_prom("interpret", 1, 1,
2349 " s\" /builtin\" find-device"
2350 " new-device"
2351 " 1 encode-int s\" #address-cells\" property"
2352 " 0 encode-int s\" #size-cells\" property"
2353 " s\" mdio\" device-name"
2354 " s\" fsl,mpc5200b-mdio\" encode-string"
2355 " s\" compatible\" property"
2356 " 0xf0003000 0x400 reg"
2357 " 0x2 encode-int"
2358 " 0x5 encode-int encode+"
2359 " 0x3 encode-int encode+"
2360 " s\" interrupts\" property"
2361 " finish-device");
2362 };
2363
2364 /* Check for a PHY device node - if missing then create one and
2365 * give it's phandle to the ethernet node */
2366 node = call_prom("finddevice", 1, 1,
2367 ADDR("/builtin/mdio/ethernet-phy"));
2368 if (!PHANDLE_VALID(node)) {
2369 prom_printf("Adding Ethernet PHY node\n");
2370 call_prom("interpret", 1, 1,
2371 " s\" /builtin/mdio\" find-device"
2372 " new-device"
2373 " s\" ethernet-phy\" device-name"
2374 " 0x10 encode-int s\" reg\" property"
2375 " my-self"
2376 " ihandle>phandle"
2377 " finish-device"
2378 " s\" /builtin/ethernet\" find-device"
2379 " encode-int"
2380 " s\" phy-handle\" property"
2381 " device-end");
2382 }
2383}
2384
2385static void __init fixup_device_tree_efika(void)
2386{
2387 int sound_irq[3] = { 2, 2, 0 };
2388 int bcomm_irq[3*16] = { 3,0,0, 3,1,0, 3,2,0, 3,3,0,
2389 3,4,0, 3,5,0, 3,6,0, 3,7,0,
2390 3,8,0, 3,9,0, 3,10,0, 3,11,0,
2391 3,12,0, 3,13,0, 3,14,0, 3,15,0 };
2392 u32 node;
2393 char prop[64];
2394 int rv, len;
2395
2396 /* Check if we're really running on a EFIKA */
2397 node = call_prom("finddevice", 1, 1, ADDR("/"));
2398 if (!PHANDLE_VALID(node))
2399 return;
2400
2401 rv = prom_getprop(node, "model", prop, sizeof(prop));
2402 if (rv == PROM_ERROR)
2403 return;
2404 if (strcmp(prop, "EFIKA5K2"))
2405 return;
2406
2407 prom_printf("Applying EFIKA device tree fixups\n");
2408
2409 /* Claiming to be 'chrp' is death */
2410 node = call_prom("finddevice", 1, 1, ADDR("/"));
2411 rv = prom_getprop(node, "device_type", prop, sizeof(prop));
2412 if (rv != PROM_ERROR && (strcmp(prop, "chrp") == 0))
2413 prom_setprop(node, "/", "device_type", "efika", sizeof("efika"));
2414
2415 /* CODEGEN,description is exposed in /proc/cpuinfo so
2416 fix that too */
2417 rv = prom_getprop(node, "CODEGEN,description", prop, sizeof(prop));
2418 if (rv != PROM_ERROR && (strstr(prop, "CHRP")))
2419 prom_setprop(node, "/", "CODEGEN,description",
2420 "Efika 5200B PowerPC System",
2421 sizeof("Efika 5200B PowerPC System"));
2422
2423 /* Fixup bestcomm interrupts property */
2424 node = call_prom("finddevice", 1, 1, ADDR("/builtin/bestcomm"));
2425 if (PHANDLE_VALID(node)) {
2426 len = prom_getproplen(node, "interrupts");
2427 if (len == 12) {
2428 prom_printf("Fixing bestcomm interrupts property\n");
2429 prom_setprop(node, "/builtin/bestcom", "interrupts",
2430 bcomm_irq, sizeof(bcomm_irq));
2431 }
2432 }
2433
2434 /* Fixup sound interrupts property */
2435 node = call_prom("finddevice", 1, 1, ADDR("/builtin/sound"));
2436 if (PHANDLE_VALID(node)) {
2437 rv = prom_getprop(node, "interrupts", prop, sizeof(prop));
2438 if (rv == PROM_ERROR) {
2439 prom_printf("Adding sound interrupts property\n");
2440 prom_setprop(node, "/builtin/sound", "interrupts",
2441 sound_irq, sizeof(sound_irq));
2442 }
2443 }
2444
2445 /* Make sure ethernet phy-handle property exists */
2446 fixup_device_tree_efika_add_phy();
2447}
2448#else
2449#define fixup_device_tree_efika()
2450#endif
2451
2452static void __init fixup_device_tree(void)
2453{
2454 fixup_device_tree_maple();
2455 fixup_device_tree_maple_memory_controller();
2456 fixup_device_tree_chrp();
2457 fixup_device_tree_pmac();
2458 fixup_device_tree_efika();
2459}
2460
2461static void __init prom_find_boot_cpu(void)
2462{
2463 struct prom_t *_prom = &RELOC(prom);
2464 u32 getprop_rval;
2465 ihandle prom_cpu;
2466 phandle cpu_pkg;
2467
2468 _prom->cpu = 0;
2469 if (prom_getprop(_prom->chosen, "cpu", &prom_cpu, sizeof(prom_cpu)) <= 0)
2470 return;
2471
2472 cpu_pkg = call_prom("instance-to-package", 1, 1, prom_cpu);
2473
2474 prom_getprop(cpu_pkg, "reg", &getprop_rval, sizeof(getprop_rval));
2475 _prom->cpu = getprop_rval;
2476
2477 prom_debug("Booting CPU hw index = %lu\n", _prom->cpu);
2478}
2479
2480static void __init prom_check_initrd(unsigned long r3, unsigned long r4)
2481{
2482#ifdef CONFIG_BLK_DEV_INITRD
2483 struct prom_t *_prom = &RELOC(prom);
2484
2485 if (r3 && r4 && r4 != 0xdeadbeef) {
2486 unsigned long val;
2487
2488 RELOC(prom_initrd_start) = is_kernel_addr(r3) ? __pa(r3) : r3;
2489 RELOC(prom_initrd_end) = RELOC(prom_initrd_start) + r4;
2490
2491 val = RELOC(prom_initrd_start);
2492 prom_setprop(_prom->chosen, "/chosen", "linux,initrd-start",
2493 &val, sizeof(val));
2494 val = RELOC(prom_initrd_end);
2495 prom_setprop(_prom->chosen, "/chosen", "linux,initrd-end",
2496 &val, sizeof(val));
2497
2498 reserve_mem(RELOC(prom_initrd_start),
2499 RELOC(prom_initrd_end) - RELOC(prom_initrd_start));
2500
2501 prom_debug("initrd_start=0x%x\n", RELOC(prom_initrd_start));
2502 prom_debug("initrd_end=0x%x\n", RELOC(prom_initrd_end));
2503 }
2504#endif /* CONFIG_BLK_DEV_INITRD */
2505}
2506
2507/*
2508 * We enter here early on, when the Open Firmware prom is still
2509 * handling exceptions and the MMU hash table for us.
2510 */
2511
2512unsigned long __init prom_init(unsigned long r3, unsigned long r4,
2513 unsigned long pp,
2514 unsigned long r6, unsigned long r7,
2515 unsigned long kbase)
2516{
2517 struct prom_t *_prom;
2518 unsigned long hdr;
2519
2520#ifdef CONFIG_PPC32
2521 unsigned long offset = reloc_offset();
2522 reloc_got2(offset);
2523#endif
2524
2525 _prom = &RELOC(prom);
2526
2527 /*
2528 * First zero the BSS
2529 */
2530 memset(&RELOC(__bss_start), 0, __bss_stop - __bss_start);
2531
2532 /*
2533 * Init interface to Open Firmware, get some node references,
2534 * like /chosen
2535 */
2536 prom_init_client_services(pp);
2537
2538 /*
2539 * See if this OF is old enough that we need to do explicit maps
2540 * and other workarounds
2541 */
2542 prom_find_mmu();
2543
2544 /*
2545 * Init prom stdout device
2546 */
2547 prom_init_stdout();
2548
2549 prom_printf("Preparing to boot %s", RELOC(linux_banner));
2550
2551 /*
2552 * Get default machine type. At this point, we do not differentiate
2553 * between pSeries SMP and pSeries LPAR
2554 */
2555 RELOC(of_platform) = prom_find_machine_type();
2556
2557#ifndef CONFIG_RELOCATABLE
2558 /* Bail if this is a kdump kernel. */
2559 if (PHYSICAL_START > 0)
2560 prom_panic("Error: You can't boot a kdump kernel from OF!\n");
2561#endif
2562
2563 /*
2564 * Check for an initrd
2565 */
2566 prom_check_initrd(r3, r4);
2567
2568#ifdef CONFIG_PPC_PSERIES
2569 /*
2570 * On pSeries, inform the firmware about our capabilities
2571 */
2572 if (RELOC(of_platform) == PLATFORM_PSERIES ||
2573 RELOC(of_platform) == PLATFORM_PSERIES_LPAR)
2574 prom_send_capabilities();
2575#endif
2576
2577 /*
2578 * Copy the CPU hold code
2579 */
2580 if (RELOC(of_platform) != PLATFORM_POWERMAC)
2581 copy_and_flush(0, kbase, 0x100, 0);
2582
2583 /*
2584 * Do early parsing of command line
2585 */
2586 early_cmdline_parse();
2587
2588 /*
2589 * Initialize memory management within prom_init
2590 */
2591 prom_init_mem();
2592
2593 /*
2594 * Determine which cpu is actually running right _now_
2595 */
2596 prom_find_boot_cpu();
2597
2598 /*
2599 * Initialize display devices
2600 */
2601 prom_check_displays();
2602
2603#ifdef CONFIG_PPC64
2604 /*
2605 * Initialize IOMMU (TCE tables) on pSeries. Do that before anything else
2606 * that uses the allocator, we need to make sure we get the top of memory
2607 * available for us here...
2608 */
2609 if (RELOC(of_platform) == PLATFORM_PSERIES)
2610 prom_initialize_tce_table();
2611#endif
2612
2613 /*
2614 * On non-powermacs, try to instantiate RTAS and puts all CPUs
2615 * in spin-loops. PowerMacs don't have a working RTAS and use
2616 * a different way to spin CPUs
2617 */
2618 if (RELOC(of_platform) != PLATFORM_POWERMAC) {
2619 prom_instantiate_rtas();
2620 prom_hold_cpus();
2621 }
2622
2623 /*
2624 * Fill in some infos for use by the kernel later on
2625 */
2626 if (RELOC(prom_memory_limit))
2627 prom_setprop(_prom->chosen, "/chosen", "linux,memory-limit",
2628 &RELOC(prom_memory_limit),
2629 sizeof(prom_memory_limit));
2630#ifdef CONFIG_PPC64
2631 if (RELOC(prom_iommu_off))
2632 prom_setprop(_prom->chosen, "/chosen", "linux,iommu-off",
2633 NULL, 0);
2634
2635 if (RELOC(prom_iommu_force_on))
2636 prom_setprop(_prom->chosen, "/chosen", "linux,iommu-force-on",
2637 NULL, 0);
2638
2639 if (RELOC(prom_tce_alloc_start)) {
2640 prom_setprop(_prom->chosen, "/chosen", "linux,tce-alloc-start",
2641 &RELOC(prom_tce_alloc_start),
2642 sizeof(prom_tce_alloc_start));
2643 prom_setprop(_prom->chosen, "/chosen", "linux,tce-alloc-end",
2644 &RELOC(prom_tce_alloc_end),
2645 sizeof(prom_tce_alloc_end));
2646 }
2647#endif
2648
2649 /*
2650 * Fixup any known bugs in the device-tree
2651 */
2652 fixup_device_tree();
2653
2654 /*
2655 * Now finally create the flattened device-tree
2656 */
2657 prom_printf("copying OF device tree...\n");
2658 flatten_device_tree();
2659
2660 /*
2661 * in case stdin is USB and still active on IBM machines...
2662 * Unfortunately quiesce crashes on some powermacs if we have
2663 * closed stdin already (in particular the powerbook 101).
2664 */
2665 if (RELOC(of_platform) != PLATFORM_POWERMAC)
2666 prom_close_stdin();
2667
2668 /*
2669 * Call OF "quiesce" method to shut down pending DMA's from
2670 * devices etc...
2671 */
2672 prom_printf("Calling quiesce...\n");
2673 call_prom("quiesce", 0, 0);
2674
2675 /*
2676 * And finally, call the kernel passing it the flattened device
2677 * tree and NULL as r5, thus triggering the new entry point which
2678 * is common to us and kexec
2679 */
2680 hdr = RELOC(dt_header_start);
2681 prom_printf("returning from prom_init\n");
2682 prom_debug("->dt_header_start=0x%x\n", hdr);
2683
2684#ifdef CONFIG_PPC32
2685 reloc_got2(-offset);
2686#endif
2687
2688 __start(hdr, kbase, 0);
2689
2690 return 0;
2691}