Loading...
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 <linux/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 <linux/of.h>
32#include <linux/of_fdt.h>
33#include <asm/prom.h>
34#include <asm/rtas.h>
35#include <asm/page.h>
36#include <asm/processor.h>
37#include <asm/interrupt.h>
38#include <asm/irq.h>
39#include <asm/io.h>
40#include <asm/smp.h>
41#include <asm/mmu.h>
42#include <asm/iommu.h>
43#include <asm/btext.h>
44#include <asm/sections.h>
45#include <asm/setup.h>
46#include <asm/asm-prototypes.h>
47#include <asm/ultravisor-api.h>
48
49#include <linux/linux_logo.h>
50
51/* All of prom_init bss lives here */
52#define __prombss __section(".bss.prominit")
53
54/*
55 * Eventually bump that one up
56 */
57#define DEVTREE_CHUNK_SIZE 0x100000
58
59/*
60 * This is the size of the local memory reserve map that gets copied
61 * into the boot params passed to the kernel. That size is totally
62 * flexible as the kernel just reads the list until it encounters an
63 * entry with size 0, so it can be changed without breaking binary
64 * compatibility
65 */
66#define MEM_RESERVE_MAP_SIZE 8
67
68/*
69 * prom_init() is called very early on, before the kernel text
70 * and data have been mapped to KERNELBASE. At this point the code
71 * is running at whatever address it has been loaded at.
72 * On ppc32 we compile with -mrelocatable, which means that references
73 * to extern and static variables get relocated automatically.
74 * ppc64 objects are always relocatable, we just need to relocate the
75 * TOC.
76 *
77 * Because OF may have mapped I/O devices into the area starting at
78 * KERNELBASE, particularly on CHRP machines, we can't safely call
79 * OF once the kernel has been mapped to KERNELBASE. Therefore all
80 * OF calls must be done within prom_init().
81 *
82 * ADDR is used in calls to call_prom. The 4th and following
83 * arguments to call_prom should be 32-bit values.
84 * On ppc64, 64 bit values are truncated to 32 bits (and
85 * fortunately don't get interpreted as two arguments).
86 */
87#define ADDR(x) (u32)(unsigned long)(x)
88
89#ifdef CONFIG_PPC64
90#define OF_WORKAROUNDS 0
91#else
92#define OF_WORKAROUNDS of_workarounds
93static int of_workarounds __prombss;
94#endif
95
96#define OF_WA_CLAIM 1 /* do phys/virt claim separately, then map */
97#define OF_WA_LONGTRAIL 2 /* work around longtrail bugs */
98
99#ifdef DEBUG_PROM
100#define prom_debug(x...) prom_printf(x)
101#else
102#define prom_debug(x...) do { } while (0)
103#endif
104
105
106typedef u32 prom_arg_t;
107
108struct prom_args {
109 __be32 service;
110 __be32 nargs;
111 __be32 nret;
112 __be32 args[10];
113};
114
115struct prom_t {
116 ihandle root;
117 phandle chosen;
118 int cpu;
119 ihandle stdout;
120 ihandle mmumap;
121 ihandle memory;
122};
123
124struct mem_map_entry {
125 __be64 base;
126 __be64 size;
127};
128
129typedef __be32 cell_t;
130
131extern void __start(unsigned long r3, unsigned long r4, unsigned long r5,
132 unsigned long r6, unsigned long r7, unsigned long r8,
133 unsigned long r9);
134
135#ifdef CONFIG_PPC64
136extern int enter_prom(struct prom_args *args, unsigned long entry);
137#else
138static inline int enter_prom(struct prom_args *args, unsigned long entry)
139{
140 return ((int (*)(struct prom_args *))entry)(args);
141}
142#endif
143
144extern void copy_and_flush(unsigned long dest, unsigned long src,
145 unsigned long size, unsigned long offset);
146
147/* prom structure */
148static struct prom_t __prombss prom;
149
150static unsigned long __prombss prom_entry;
151
152static char __prombss of_stdout_device[256];
153static char __prombss prom_scratch[256];
154
155static unsigned long __prombss dt_header_start;
156static unsigned long __prombss dt_struct_start, dt_struct_end;
157static unsigned long __prombss dt_string_start, dt_string_end;
158
159static unsigned long __prombss prom_initrd_start, prom_initrd_end;
160
161#ifdef CONFIG_PPC64
162static int __prombss prom_iommu_force_on;
163static int __prombss prom_iommu_off;
164static unsigned long __prombss prom_tce_alloc_start;
165static unsigned long __prombss prom_tce_alloc_end;
166#endif
167
168#ifdef CONFIG_PPC_PSERIES
169static bool __prombss prom_radix_disable;
170static bool __prombss prom_radix_gtse_disable;
171static bool __prombss prom_xive_disable;
172#endif
173
174#ifdef CONFIG_PPC_SVM
175static bool __prombss prom_svm_enable;
176#endif
177
178struct platform_support {
179 bool hash_mmu;
180 bool radix_mmu;
181 bool radix_gtse;
182 bool xive;
183};
184
185/* Platforms codes are now obsolete in the kernel. Now only used within this
186 * file and ultimately gone too. Feel free to change them if you need, they
187 * are not shared with anything outside of this file anymore
188 */
189#define PLATFORM_PSERIES 0x0100
190#define PLATFORM_PSERIES_LPAR 0x0101
191#define PLATFORM_LPAR 0x0001
192#define PLATFORM_POWERMAC 0x0400
193#define PLATFORM_GENERIC 0x0500
194
195static int __prombss of_platform;
196
197static char __prombss prom_cmd_line[COMMAND_LINE_SIZE];
198
199static unsigned long __prombss prom_memory_limit;
200
201static unsigned long __prombss alloc_top;
202static unsigned long __prombss alloc_top_high;
203static unsigned long __prombss alloc_bottom;
204static unsigned long __prombss rmo_top;
205static unsigned long __prombss ram_top;
206
207static struct mem_map_entry __prombss mem_reserve_map[MEM_RESERVE_MAP_SIZE];
208static int __prombss mem_reserve_cnt;
209
210static cell_t __prombss regbuf[1024];
211
212static bool __prombss rtas_has_query_cpu_stopped;
213
214
215/*
216 * Error results ... some OF calls will return "-1" on error, some
217 * will return 0, some will return either. To simplify, here are
218 * macros to use with any ihandle or phandle return value to check if
219 * it is valid
220 */
221
222#define PROM_ERROR (-1u)
223#define PHANDLE_VALID(p) ((p) != 0 && (p) != PROM_ERROR)
224#define IHANDLE_VALID(i) ((i) != 0 && (i) != PROM_ERROR)
225
226/* Copied from lib/string.c and lib/kstrtox.c */
227
228static int __init prom_strcmp(const char *cs, const char *ct)
229{
230 unsigned char c1, c2;
231
232 while (1) {
233 c1 = *cs++;
234 c2 = *ct++;
235 if (c1 != c2)
236 return c1 < c2 ? -1 : 1;
237 if (!c1)
238 break;
239 }
240 return 0;
241}
242
243static ssize_t __init prom_strscpy_pad(char *dest, const char *src, size_t n)
244{
245 ssize_t rc;
246 size_t i;
247
248 if (n == 0 || n > INT_MAX)
249 return -E2BIG;
250
251 // Copy up to n bytes
252 for (i = 0; i < n && src[i] != '\0'; i++)
253 dest[i] = src[i];
254
255 rc = i;
256
257 // If we copied all n then we have run out of space for the nul
258 if (rc == n) {
259 // Rewind by one character to ensure nul termination
260 i--;
261 rc = -E2BIG;
262 }
263
264 for (; i < n; i++)
265 dest[i] = '\0';
266
267 return rc;
268}
269
270static int __init prom_strncmp(const char *cs, const char *ct, size_t count)
271{
272 unsigned char c1, c2;
273
274 while (count) {
275 c1 = *cs++;
276 c2 = *ct++;
277 if (c1 != c2)
278 return c1 < c2 ? -1 : 1;
279 if (!c1)
280 break;
281 count--;
282 }
283 return 0;
284}
285
286static size_t __init prom_strlen(const char *s)
287{
288 const char *sc;
289
290 for (sc = s; *sc != '\0'; ++sc)
291 /* nothing */;
292 return sc - s;
293}
294
295static int __init prom_memcmp(const void *cs, const void *ct, size_t count)
296{
297 const unsigned char *su1, *su2;
298 int res = 0;
299
300 for (su1 = cs, su2 = ct; 0 < count; ++su1, ++su2, count--)
301 if ((res = *su1 - *su2) != 0)
302 break;
303 return res;
304}
305
306static char __init *prom_strstr(const char *s1, const char *s2)
307{
308 size_t l1, l2;
309
310 l2 = prom_strlen(s2);
311 if (!l2)
312 return (char *)s1;
313 l1 = prom_strlen(s1);
314 while (l1 >= l2) {
315 l1--;
316 if (!prom_memcmp(s1, s2, l2))
317 return (char *)s1;
318 s1++;
319 }
320 return NULL;
321}
322
323static size_t __init prom_strlcat(char *dest, const char *src, size_t count)
324{
325 size_t dsize = prom_strlen(dest);
326 size_t len = prom_strlen(src);
327 size_t res = dsize + len;
328
329 /* This would be a bug */
330 if (dsize >= count)
331 return count;
332
333 dest += dsize;
334 count -= dsize;
335 if (len >= count)
336 len = count-1;
337 memcpy(dest, src, len);
338 dest[len] = 0;
339 return res;
340
341}
342
343#ifdef CONFIG_PPC_PSERIES
344static int __init prom_strtobool(const char *s, bool *res)
345{
346 if (!s)
347 return -EINVAL;
348
349 switch (s[0]) {
350 case 'y':
351 case 'Y':
352 case '1':
353 *res = true;
354 return 0;
355 case 'n':
356 case 'N':
357 case '0':
358 *res = false;
359 return 0;
360 case 'o':
361 case 'O':
362 switch (s[1]) {
363 case 'n':
364 case 'N':
365 *res = true;
366 return 0;
367 case 'f':
368 case 'F':
369 *res = false;
370 return 0;
371 default:
372 break;
373 }
374 break;
375 default:
376 break;
377 }
378
379 return -EINVAL;
380}
381#endif
382
383/* This is the one and *ONLY* place where we actually call open
384 * firmware.
385 */
386
387static int __init call_prom(const char *service, int nargs, int nret, ...)
388{
389 int i;
390 struct prom_args args;
391 va_list list;
392
393 args.service = cpu_to_be32(ADDR(service));
394 args.nargs = cpu_to_be32(nargs);
395 args.nret = cpu_to_be32(nret);
396
397 va_start(list, nret);
398 for (i = 0; i < nargs; i++)
399 args.args[i] = cpu_to_be32(va_arg(list, prom_arg_t));
400 va_end(list);
401
402 for (i = 0; i < nret; i++)
403 args.args[nargs+i] = 0;
404
405 if (enter_prom(&args, prom_entry) < 0)
406 return PROM_ERROR;
407
408 return (nret > 0) ? be32_to_cpu(args.args[nargs]) : 0;
409}
410
411static int __init call_prom_ret(const char *service, int nargs, int nret,
412 prom_arg_t *rets, ...)
413{
414 int i;
415 struct prom_args args;
416 va_list list;
417
418 args.service = cpu_to_be32(ADDR(service));
419 args.nargs = cpu_to_be32(nargs);
420 args.nret = cpu_to_be32(nret);
421
422 va_start(list, rets);
423 for (i = 0; i < nargs; i++)
424 args.args[i] = cpu_to_be32(va_arg(list, prom_arg_t));
425 va_end(list);
426
427 for (i = 0; i < nret; i++)
428 args.args[nargs+i] = 0;
429
430 if (enter_prom(&args, prom_entry) < 0)
431 return PROM_ERROR;
432
433 if (rets != NULL)
434 for (i = 1; i < nret; ++i)
435 rets[i-1] = be32_to_cpu(args.args[nargs+i]);
436
437 return (nret > 0) ? be32_to_cpu(args.args[nargs]) : 0;
438}
439
440
441static void __init prom_print(const char *msg)
442{
443 const char *p, *q;
444
445 if (prom.stdout == 0)
446 return;
447
448 for (p = msg; *p != 0; p = q) {
449 for (q = p; *q != 0 && *q != '\n'; ++q)
450 ;
451 if (q > p)
452 call_prom("write", 3, 1, prom.stdout, p, q - p);
453 if (*q == 0)
454 break;
455 ++q;
456 call_prom("write", 3, 1, prom.stdout, ADDR("\r\n"), 2);
457 }
458}
459
460
461/*
462 * Both prom_print_hex & prom_print_dec takes an unsigned long as input so that
463 * we do not need __udivdi3 or __umoddi3 on 32bits.
464 */
465static void __init prom_print_hex(unsigned long val)
466{
467 int i, nibbles = sizeof(val)*2;
468 char buf[sizeof(val)*2+1];
469
470 for (i = nibbles-1; i >= 0; i--) {
471 buf[i] = (val & 0xf) + '0';
472 if (buf[i] > '9')
473 buf[i] += ('a'-'0'-10);
474 val >>= 4;
475 }
476 buf[nibbles] = '\0';
477 call_prom("write", 3, 1, prom.stdout, buf, nibbles);
478}
479
480/* max number of decimal digits in an unsigned long */
481#define UL_DIGITS 21
482static void __init prom_print_dec(unsigned long val)
483{
484 int i, size;
485 char buf[UL_DIGITS+1];
486
487 for (i = UL_DIGITS-1; i >= 0; i--) {
488 buf[i] = (val % 10) + '0';
489 val = val/10;
490 if (val == 0)
491 break;
492 }
493 /* shift stuff down */
494 size = UL_DIGITS - i;
495 call_prom("write", 3, 1, prom.stdout, buf+i, size);
496}
497
498__printf(1, 2)
499static void __init prom_printf(const char *format, ...)
500{
501 const char *p, *q, *s;
502 va_list args;
503 unsigned long v;
504 long vs;
505 int n = 0;
506
507 va_start(args, format);
508 for (p = format; *p != 0; p = q) {
509 for (q = p; *q != 0 && *q != '\n' && *q != '%'; ++q)
510 ;
511 if (q > p)
512 call_prom("write", 3, 1, prom.stdout, p, q - p);
513 if (*q == 0)
514 break;
515 if (*q == '\n') {
516 ++q;
517 call_prom("write", 3, 1, prom.stdout,
518 ADDR("\r\n"), 2);
519 continue;
520 }
521 ++q;
522 if (*q == 0)
523 break;
524 while (*q == 'l') {
525 ++q;
526 ++n;
527 }
528 switch (*q) {
529 case 's':
530 ++q;
531 s = va_arg(args, const char *);
532 prom_print(s);
533 break;
534 case 'x':
535 ++q;
536 switch (n) {
537 case 0:
538 v = va_arg(args, unsigned int);
539 break;
540 case 1:
541 v = va_arg(args, unsigned long);
542 break;
543 case 2:
544 default:
545 v = va_arg(args, unsigned long long);
546 break;
547 }
548 prom_print_hex(v);
549 break;
550 case 'u':
551 ++q;
552 switch (n) {
553 case 0:
554 v = va_arg(args, unsigned int);
555 break;
556 case 1:
557 v = va_arg(args, unsigned long);
558 break;
559 case 2:
560 default:
561 v = va_arg(args, unsigned long long);
562 break;
563 }
564 prom_print_dec(v);
565 break;
566 case 'd':
567 ++q;
568 switch (n) {
569 case 0:
570 vs = va_arg(args, int);
571 break;
572 case 1:
573 vs = va_arg(args, long);
574 break;
575 case 2:
576 default:
577 vs = va_arg(args, long long);
578 break;
579 }
580 if (vs < 0) {
581 prom_print("-");
582 vs = -vs;
583 }
584 prom_print_dec(vs);
585 break;
586 }
587 }
588 va_end(args);
589}
590
591
592static unsigned int __init prom_claim(unsigned long virt, unsigned long size,
593 unsigned long align)
594{
595
596 if (align == 0 && (OF_WORKAROUNDS & OF_WA_CLAIM)) {
597 /*
598 * Old OF requires we claim physical and virtual separately
599 * and then map explicitly (assuming virtual mode)
600 */
601 int ret;
602 prom_arg_t result;
603
604 ret = call_prom_ret("call-method", 5, 2, &result,
605 ADDR("claim"), prom.memory,
606 align, size, virt);
607 if (ret != 0 || result == -1)
608 return -1;
609 ret = call_prom_ret("call-method", 5, 2, &result,
610 ADDR("claim"), prom.mmumap,
611 align, size, virt);
612 if (ret != 0) {
613 call_prom("call-method", 4, 1, ADDR("release"),
614 prom.memory, size, virt);
615 return -1;
616 }
617 /* the 0x12 is M (coherence) + PP == read/write */
618 call_prom("call-method", 6, 1,
619 ADDR("map"), prom.mmumap, 0x12, size, virt, virt);
620 return virt;
621 }
622 return call_prom("claim", 3, 1, (prom_arg_t)virt, (prom_arg_t)size,
623 (prom_arg_t)align);
624}
625
626static void __init __attribute__((noreturn)) prom_panic(const char *reason)
627{
628 prom_print(reason);
629 /* Do not call exit because it clears the screen on pmac
630 * it also causes some sort of double-fault on early pmacs */
631 if (of_platform == PLATFORM_POWERMAC)
632 asm("trap\n");
633
634 /* ToDo: should put up an SRC here on pSeries */
635 call_prom("exit", 0, 0);
636
637 for (;;) /* should never get here */
638 ;
639}
640
641
642static int __init prom_next_node(phandle *nodep)
643{
644 phandle node;
645
646 if ((node = *nodep) != 0
647 && (*nodep = call_prom("child", 1, 1, node)) != 0)
648 return 1;
649 if ((*nodep = call_prom("peer", 1, 1, node)) != 0)
650 return 1;
651 for (;;) {
652 if ((node = call_prom("parent", 1, 1, node)) == 0)
653 return 0;
654 if ((*nodep = call_prom("peer", 1, 1, node)) != 0)
655 return 1;
656 }
657}
658
659static inline int __init prom_getprop(phandle node, const char *pname,
660 void *value, size_t valuelen)
661{
662 return call_prom("getprop", 4, 1, node, ADDR(pname),
663 (u32)(unsigned long) value, (u32) valuelen);
664}
665
666static inline int __init prom_getproplen(phandle node, const char *pname)
667{
668 return call_prom("getproplen", 2, 1, node, ADDR(pname));
669}
670
671static void __init add_string(char **str, const char *q)
672{
673 char *p = *str;
674
675 while (*q)
676 *p++ = *q++;
677 *p++ = ' ';
678 *str = p;
679}
680
681static char *__init tohex(unsigned int x)
682{
683 static const char digits[] __initconst = "0123456789abcdef";
684 static char result[9] __prombss;
685 int i;
686
687 result[8] = 0;
688 i = 8;
689 do {
690 --i;
691 result[i] = digits[x & 0xf];
692 x >>= 4;
693 } while (x != 0 && i > 0);
694 return &result[i];
695}
696
697static int __init prom_setprop(phandle node, const char *nodename,
698 const char *pname, void *value, size_t valuelen)
699{
700 char cmd[256], *p;
701
702 if (!(OF_WORKAROUNDS & OF_WA_LONGTRAIL))
703 return call_prom("setprop", 4, 1, node, ADDR(pname),
704 (u32)(unsigned long) value, (u32) valuelen);
705
706 /* gah... setprop doesn't work on longtrail, have to use interpret */
707 p = cmd;
708 add_string(&p, "dev");
709 add_string(&p, nodename);
710 add_string(&p, tohex((u32)(unsigned long) value));
711 add_string(&p, tohex(valuelen));
712 add_string(&p, tohex(ADDR(pname)));
713 add_string(&p, tohex(prom_strlen(pname)));
714 add_string(&p, "property");
715 *p = 0;
716 return call_prom("interpret", 1, 1, (u32)(unsigned long) cmd);
717}
718
719/* We can't use the standard versions because of relocation headaches. */
720#define prom_isxdigit(c) \
721 (('0' <= (c) && (c) <= '9') || ('a' <= (c) && (c) <= 'f') || ('A' <= (c) && (c) <= 'F'))
722
723#define prom_isdigit(c) ('0' <= (c) && (c) <= '9')
724#define prom_islower(c) ('a' <= (c) && (c) <= 'z')
725#define prom_toupper(c) (prom_islower(c) ? ((c) - 'a' + 'A') : (c))
726
727static unsigned long __init prom_strtoul(const char *cp, const char **endp)
728{
729 unsigned long result = 0, base = 10, value;
730
731 if (*cp == '0') {
732 base = 8;
733 cp++;
734 if (prom_toupper(*cp) == 'X') {
735 cp++;
736 base = 16;
737 }
738 }
739
740 while (prom_isxdigit(*cp) &&
741 (value = prom_isdigit(*cp) ? *cp - '0' : prom_toupper(*cp) - 'A' + 10) < base) {
742 result = result * base + value;
743 cp++;
744 }
745
746 if (endp)
747 *endp = cp;
748
749 return result;
750}
751
752static unsigned long __init prom_memparse(const char *ptr, const char **retptr)
753{
754 unsigned long ret = prom_strtoul(ptr, retptr);
755 int shift = 0;
756
757 /*
758 * We can't use a switch here because GCC *may* generate a
759 * jump table which won't work, because we're not running at
760 * the address we're linked at.
761 */
762 if ('G' == **retptr || 'g' == **retptr)
763 shift = 30;
764
765 if ('M' == **retptr || 'm' == **retptr)
766 shift = 20;
767
768 if ('K' == **retptr || 'k' == **retptr)
769 shift = 10;
770
771 if (shift) {
772 ret <<= shift;
773 (*retptr)++;
774 }
775
776 return ret;
777}
778
779/*
780 * Early parsing of the command line passed to the kernel, used for
781 * "mem=x" and the options that affect the iommu
782 */
783static void __init early_cmdline_parse(void)
784{
785 const char *opt;
786
787 char *p;
788 int l = 0;
789
790 prom_cmd_line[0] = 0;
791 p = prom_cmd_line;
792
793 if (!IS_ENABLED(CONFIG_CMDLINE_FORCE) && (long)prom.chosen > 0)
794 l = prom_getprop(prom.chosen, "bootargs", p, COMMAND_LINE_SIZE-1);
795
796 if (IS_ENABLED(CONFIG_CMDLINE_EXTEND) || l <= 0 || p[0] == '\0')
797 prom_strlcat(prom_cmd_line, " " CONFIG_CMDLINE,
798 sizeof(prom_cmd_line));
799
800 prom_printf("command line: %s\n", prom_cmd_line);
801
802#ifdef CONFIG_PPC64
803 opt = prom_strstr(prom_cmd_line, "iommu=");
804 if (opt) {
805 prom_printf("iommu opt is: %s\n", opt);
806 opt += 6;
807 while (*opt && *opt == ' ')
808 opt++;
809 if (!prom_strncmp(opt, "off", 3))
810 prom_iommu_off = 1;
811 else if (!prom_strncmp(opt, "force", 5))
812 prom_iommu_force_on = 1;
813 }
814#endif
815 opt = prom_strstr(prom_cmd_line, "mem=");
816 if (opt) {
817 opt += 4;
818 prom_memory_limit = prom_memparse(opt, (const char **)&opt);
819#ifdef CONFIG_PPC64
820 /* Align to 16 MB == size of ppc64 large page */
821 prom_memory_limit = ALIGN(prom_memory_limit, 0x1000000);
822#endif
823 }
824
825#ifdef CONFIG_PPC_PSERIES
826 prom_radix_disable = !IS_ENABLED(CONFIG_PPC_RADIX_MMU_DEFAULT);
827 opt = prom_strstr(prom_cmd_line, "disable_radix");
828 if (opt) {
829 opt += 13;
830 if (*opt && *opt == '=') {
831 bool val;
832
833 if (prom_strtobool(++opt, &val))
834 prom_radix_disable = false;
835 else
836 prom_radix_disable = val;
837 } else
838 prom_radix_disable = true;
839 }
840 if (prom_radix_disable)
841 prom_debug("Radix disabled from cmdline\n");
842
843 opt = prom_strstr(prom_cmd_line, "radix_hcall_invalidate=on");
844 if (opt) {
845 prom_radix_gtse_disable = true;
846 prom_debug("Radix GTSE disabled from cmdline\n");
847 }
848
849 opt = prom_strstr(prom_cmd_line, "xive=off");
850 if (opt) {
851 prom_xive_disable = true;
852 prom_debug("XIVE disabled from cmdline\n");
853 }
854#endif /* CONFIG_PPC_PSERIES */
855
856#ifdef CONFIG_PPC_SVM
857 opt = prom_strstr(prom_cmd_line, "svm=");
858 if (opt) {
859 bool val;
860
861 opt += sizeof("svm=") - 1;
862 if (!prom_strtobool(opt, &val))
863 prom_svm_enable = val;
864 }
865#endif /* CONFIG_PPC_SVM */
866}
867
868#ifdef CONFIG_PPC_PSERIES
869/*
870 * The architecture vector has an array of PVR mask/value pairs,
871 * followed by # option vectors - 1, followed by the option vectors.
872 *
873 * See prom.h for the definition of the bits specified in the
874 * architecture vector.
875 */
876
877/* Firmware expects the value to be n - 1, where n is the # of vectors */
878#define NUM_VECTORS(n) ((n) - 1)
879
880/*
881 * Firmware expects 1 + n - 2, where n is the length of the option vector in
882 * bytes. The 1 accounts for the length byte itself, the - 2 .. ?
883 */
884#define VECTOR_LENGTH(n) (1 + (n) - 2)
885
886struct option_vector1 {
887 u8 byte1;
888 u8 arch_versions;
889 u8 arch_versions3;
890} __packed;
891
892struct option_vector2 {
893 u8 byte1;
894 __be16 reserved;
895 __be32 real_base;
896 __be32 real_size;
897 __be32 virt_base;
898 __be32 virt_size;
899 __be32 load_base;
900 __be32 min_rma;
901 __be32 min_load;
902 u8 min_rma_percent;
903 u8 max_pft_size;
904} __packed;
905
906struct option_vector3 {
907 u8 byte1;
908 u8 byte2;
909} __packed;
910
911struct option_vector4 {
912 u8 byte1;
913 u8 min_vp_cap;
914} __packed;
915
916struct option_vector5 {
917 u8 byte1;
918 u8 byte2;
919 u8 byte3;
920 u8 cmo;
921 u8 associativity;
922 u8 bin_opts;
923 u8 micro_checkpoint;
924 u8 reserved0;
925 __be32 max_cpus;
926 __be16 papr_level;
927 __be16 reserved1;
928 u8 platform_facilities;
929 u8 reserved2;
930 __be16 reserved3;
931 u8 subprocessors;
932 u8 byte22;
933 u8 intarch;
934 u8 mmu;
935 u8 hash_ext;
936 u8 radix_ext;
937} __packed;
938
939struct option_vector6 {
940 u8 reserved;
941 u8 secondary_pteg;
942 u8 os_name;
943} __packed;
944
945struct option_vector7 {
946 u8 os_id[256];
947} __packed;
948
949struct ibm_arch_vec {
950 struct { __be32 mask, val; } pvrs[14];
951
952 u8 num_vectors;
953
954 u8 vec1_len;
955 struct option_vector1 vec1;
956
957 u8 vec2_len;
958 struct option_vector2 vec2;
959
960 u8 vec3_len;
961 struct option_vector3 vec3;
962
963 u8 vec4_len;
964 struct option_vector4 vec4;
965
966 u8 vec5_len;
967 struct option_vector5 vec5;
968
969 u8 vec6_len;
970 struct option_vector6 vec6;
971
972 u8 vec7_len;
973 struct option_vector7 vec7;
974} __packed;
975
976static const struct ibm_arch_vec ibm_architecture_vec_template __initconst = {
977 .pvrs = {
978 {
979 .mask = cpu_to_be32(0xfffe0000), /* POWER5/POWER5+ */
980 .val = cpu_to_be32(0x003a0000),
981 },
982 {
983 .mask = cpu_to_be32(0xffff0000), /* POWER6 */
984 .val = cpu_to_be32(0x003e0000),
985 },
986 {
987 .mask = cpu_to_be32(0xffff0000), /* POWER7 */
988 .val = cpu_to_be32(0x003f0000),
989 },
990 {
991 .mask = cpu_to_be32(0xffff0000), /* POWER8E */
992 .val = cpu_to_be32(0x004b0000),
993 },
994 {
995 .mask = cpu_to_be32(0xffff0000), /* POWER8NVL */
996 .val = cpu_to_be32(0x004c0000),
997 },
998 {
999 .mask = cpu_to_be32(0xffff0000), /* POWER8 */
1000 .val = cpu_to_be32(0x004d0000),
1001 },
1002 {
1003 .mask = cpu_to_be32(0xffff0000), /* POWER9 */
1004 .val = cpu_to_be32(0x004e0000),
1005 },
1006 {
1007 .mask = cpu_to_be32(0xffff0000), /* POWER10 */
1008 .val = cpu_to_be32(0x00800000),
1009 },
1010 {
1011 .mask = cpu_to_be32(0xffffffff), /* all 3.1-compliant */
1012 .val = cpu_to_be32(0x0f000006),
1013 },
1014 {
1015 .mask = cpu_to_be32(0xffffffff), /* all 3.00-compliant */
1016 .val = cpu_to_be32(0x0f000005),
1017 },
1018 {
1019 .mask = cpu_to_be32(0xffffffff), /* all 2.07-compliant */
1020 .val = cpu_to_be32(0x0f000004),
1021 },
1022 {
1023 .mask = cpu_to_be32(0xffffffff), /* all 2.06-compliant */
1024 .val = cpu_to_be32(0x0f000003),
1025 },
1026 {
1027 .mask = cpu_to_be32(0xffffffff), /* all 2.05-compliant */
1028 .val = cpu_to_be32(0x0f000002),
1029 },
1030 {
1031 .mask = cpu_to_be32(0xfffffffe), /* all 2.04-compliant and earlier */
1032 .val = cpu_to_be32(0x0f000001),
1033 },
1034 },
1035
1036 .num_vectors = NUM_VECTORS(6),
1037
1038 .vec1_len = VECTOR_LENGTH(sizeof(struct option_vector1)),
1039 .vec1 = {
1040 .byte1 = 0,
1041 .arch_versions = OV1_PPC_2_00 | OV1_PPC_2_01 | OV1_PPC_2_02 | OV1_PPC_2_03 |
1042 OV1_PPC_2_04 | OV1_PPC_2_05 | OV1_PPC_2_06 | OV1_PPC_2_07,
1043 .arch_versions3 = OV1_PPC_3_00 | OV1_PPC_3_1,
1044 },
1045
1046 .vec2_len = VECTOR_LENGTH(sizeof(struct option_vector2)),
1047 /* option vector 2: Open Firmware options supported */
1048 .vec2 = {
1049 .byte1 = OV2_REAL_MODE,
1050 .reserved = 0,
1051 .real_base = cpu_to_be32(0xffffffff),
1052 .real_size = cpu_to_be32(0xffffffff),
1053 .virt_base = cpu_to_be32(0xffffffff),
1054 .virt_size = cpu_to_be32(0xffffffff),
1055 .load_base = cpu_to_be32(0xffffffff),
1056 .min_rma = cpu_to_be32(512), /* 512MB min RMA */
1057 .min_load = cpu_to_be32(0xffffffff), /* full client load */
1058 .min_rma_percent = 0, /* min RMA percentage of total RAM */
1059 .max_pft_size = 48, /* max log_2(hash table size) */
1060 },
1061
1062 .vec3_len = VECTOR_LENGTH(sizeof(struct option_vector3)),
1063 /* option vector 3: processor options supported */
1064 .vec3 = {
1065 .byte1 = 0, /* don't ignore, don't halt */
1066 .byte2 = OV3_FP | OV3_VMX | OV3_DFP,
1067 },
1068
1069 .vec4_len = VECTOR_LENGTH(sizeof(struct option_vector4)),
1070 /* option vector 4: IBM PAPR implementation */
1071 .vec4 = {
1072 .byte1 = 0, /* don't halt */
1073 .min_vp_cap = OV4_MIN_ENT_CAP, /* minimum VP entitled capacity */
1074 },
1075
1076 .vec5_len = VECTOR_LENGTH(sizeof(struct option_vector5)),
1077 /* option vector 5: PAPR/OF options */
1078 .vec5 = {
1079 .byte1 = 0, /* don't ignore, don't halt */
1080 .byte2 = OV5_FEAT(OV5_LPAR) | OV5_FEAT(OV5_SPLPAR) | OV5_FEAT(OV5_LARGE_PAGES) |
1081 OV5_FEAT(OV5_DRCONF_MEMORY) | OV5_FEAT(OV5_DONATE_DEDICATE_CPU) |
1082#ifdef CONFIG_PCI_MSI
1083 /* PCIe/MSI support. Without MSI full PCIe is not supported */
1084 OV5_FEAT(OV5_MSI),
1085#else
1086 0,
1087#endif
1088 .byte3 = 0,
1089 .cmo =
1090#ifdef CONFIG_PPC_SMLPAR
1091 OV5_FEAT(OV5_CMO) | OV5_FEAT(OV5_XCMO),
1092#else
1093 0,
1094#endif
1095 .associativity = OV5_FEAT(OV5_FORM1_AFFINITY) | OV5_FEAT(OV5_PRRN) |
1096 OV5_FEAT(OV5_FORM2_AFFINITY),
1097 .bin_opts = OV5_FEAT(OV5_RESIZE_HPT) | OV5_FEAT(OV5_HP_EVT),
1098 .micro_checkpoint = 0,
1099 .reserved0 = 0,
1100 .max_cpus = cpu_to_be32(NR_CPUS), /* number of cores supported */
1101 .papr_level = 0,
1102 .reserved1 = 0,
1103 .platform_facilities = OV5_FEAT(OV5_PFO_HW_RNG) | OV5_FEAT(OV5_PFO_HW_ENCR) | OV5_FEAT(OV5_PFO_HW_842),
1104 .reserved2 = 0,
1105 .reserved3 = 0,
1106 .subprocessors = 1,
1107 .byte22 = OV5_FEAT(OV5_DRMEM_V2) | OV5_FEAT(OV5_DRC_INFO),
1108 .intarch = 0,
1109 .mmu = 0,
1110 .hash_ext = 0,
1111 .radix_ext = 0,
1112 },
1113
1114 /* option vector 6: IBM PAPR hints */
1115 .vec6_len = VECTOR_LENGTH(sizeof(struct option_vector6)),
1116 .vec6 = {
1117 .reserved = 0,
1118 .secondary_pteg = 0,
1119 .os_name = OV6_LINUX,
1120 },
1121
1122 /* option vector 7: OS Identification */
1123 .vec7_len = VECTOR_LENGTH(sizeof(struct option_vector7)),
1124};
1125
1126static struct ibm_arch_vec __prombss ibm_architecture_vec ____cacheline_aligned;
1127
1128/* Old method - ELF header with PT_NOTE sections only works on BE */
1129#ifdef __BIG_ENDIAN__
1130static const struct fake_elf {
1131 Elf32_Ehdr elfhdr;
1132 Elf32_Phdr phdr[2];
1133 struct chrpnote {
1134 u32 namesz;
1135 u32 descsz;
1136 u32 type;
1137 char name[8]; /* "PowerPC" */
1138 struct chrpdesc {
1139 u32 real_mode;
1140 u32 real_base;
1141 u32 real_size;
1142 u32 virt_base;
1143 u32 virt_size;
1144 u32 load_base;
1145 } chrpdesc;
1146 } chrpnote;
1147 struct rpanote {
1148 u32 namesz;
1149 u32 descsz;
1150 u32 type;
1151 char name[24]; /* "IBM,RPA-Client-Config" */
1152 struct rpadesc {
1153 u32 lpar_affinity;
1154 u32 min_rmo_size;
1155 u32 min_rmo_percent;
1156 u32 max_pft_size;
1157 u32 splpar;
1158 u32 min_load;
1159 u32 new_mem_def;
1160 u32 ignore_me;
1161 } rpadesc;
1162 } rpanote;
1163} fake_elf __initconst = {
1164 .elfhdr = {
1165 .e_ident = { 0x7f, 'E', 'L', 'F',
1166 ELFCLASS32, ELFDATA2MSB, EV_CURRENT },
1167 .e_type = ET_EXEC, /* yeah right */
1168 .e_machine = EM_PPC,
1169 .e_version = EV_CURRENT,
1170 .e_phoff = offsetof(struct fake_elf, phdr),
1171 .e_phentsize = sizeof(Elf32_Phdr),
1172 .e_phnum = 2
1173 },
1174 .phdr = {
1175 [0] = {
1176 .p_type = PT_NOTE,
1177 .p_offset = offsetof(struct fake_elf, chrpnote),
1178 .p_filesz = sizeof(struct chrpnote)
1179 }, [1] = {
1180 .p_type = PT_NOTE,
1181 .p_offset = offsetof(struct fake_elf, rpanote),
1182 .p_filesz = sizeof(struct rpanote)
1183 }
1184 },
1185 .chrpnote = {
1186 .namesz = sizeof("PowerPC"),
1187 .descsz = sizeof(struct chrpdesc),
1188 .type = 0x1275,
1189 .name = "PowerPC",
1190 .chrpdesc = {
1191 .real_mode = ~0U, /* ~0 means "don't care" */
1192 .real_base = ~0U,
1193 .real_size = ~0U,
1194 .virt_base = ~0U,
1195 .virt_size = ~0U,
1196 .load_base = ~0U
1197 },
1198 },
1199 .rpanote = {
1200 .namesz = sizeof("IBM,RPA-Client-Config"),
1201 .descsz = sizeof(struct rpadesc),
1202 .type = 0x12759999,
1203 .name = "IBM,RPA-Client-Config",
1204 .rpadesc = {
1205 .lpar_affinity = 0,
1206 .min_rmo_size = 64, /* in megabytes */
1207 .min_rmo_percent = 0,
1208 .max_pft_size = 48, /* 2^48 bytes max PFT size */
1209 .splpar = 1,
1210 .min_load = ~0U,
1211 .new_mem_def = 0
1212 }
1213 }
1214};
1215#endif /* __BIG_ENDIAN__ */
1216
1217static int __init prom_count_smt_threads(void)
1218{
1219 phandle node;
1220 char type[64];
1221 unsigned int plen;
1222
1223 /* Pick up th first CPU node we can find */
1224 for (node = 0; prom_next_node(&node); ) {
1225 type[0] = 0;
1226 prom_getprop(node, "device_type", type, sizeof(type));
1227
1228 if (prom_strcmp(type, "cpu"))
1229 continue;
1230 /*
1231 * There is an entry for each smt thread, each entry being
1232 * 4 bytes long. All cpus should have the same number of
1233 * smt threads, so return after finding the first.
1234 */
1235 plen = prom_getproplen(node, "ibm,ppc-interrupt-server#s");
1236 if (plen == PROM_ERROR)
1237 break;
1238 plen >>= 2;
1239 prom_debug("Found %lu smt threads per core\n", (unsigned long)plen);
1240
1241 /* Sanity check */
1242 if (plen < 1 || plen > 64) {
1243 prom_printf("Threads per core %lu out of bounds, assuming 1\n",
1244 (unsigned long)plen);
1245 return 1;
1246 }
1247 return plen;
1248 }
1249 prom_debug("No threads found, assuming 1 per core\n");
1250
1251 return 1;
1252
1253}
1254
1255static void __init prom_parse_mmu_model(u8 val,
1256 struct platform_support *support)
1257{
1258 switch (val) {
1259 case OV5_FEAT(OV5_MMU_DYNAMIC):
1260 case OV5_FEAT(OV5_MMU_EITHER): /* Either Available */
1261 prom_debug("MMU - either supported\n");
1262 support->radix_mmu = !prom_radix_disable;
1263 support->hash_mmu = true;
1264 break;
1265 case OV5_FEAT(OV5_MMU_RADIX): /* Only Radix */
1266 prom_debug("MMU - radix only\n");
1267 if (prom_radix_disable) {
1268 /*
1269 * If we __have__ to do radix, we're better off ignoring
1270 * the command line rather than not booting.
1271 */
1272 prom_printf("WARNING: Ignoring cmdline option disable_radix\n");
1273 }
1274 support->radix_mmu = true;
1275 break;
1276 case OV5_FEAT(OV5_MMU_HASH):
1277 prom_debug("MMU - hash only\n");
1278 support->hash_mmu = true;
1279 break;
1280 default:
1281 prom_debug("Unknown mmu support option: 0x%x\n", val);
1282 break;
1283 }
1284}
1285
1286static void __init prom_parse_xive_model(u8 val,
1287 struct platform_support *support)
1288{
1289 switch (val) {
1290 case OV5_FEAT(OV5_XIVE_EITHER): /* Either Available */
1291 prom_debug("XIVE - either mode supported\n");
1292 support->xive = !prom_xive_disable;
1293 break;
1294 case OV5_FEAT(OV5_XIVE_EXPLOIT): /* Only Exploitation mode */
1295 prom_debug("XIVE - exploitation mode supported\n");
1296 if (prom_xive_disable) {
1297 /*
1298 * If we __have__ to do XIVE, we're better off ignoring
1299 * the command line rather than not booting.
1300 */
1301 prom_printf("WARNING: Ignoring cmdline option xive=off\n");
1302 }
1303 support->xive = true;
1304 break;
1305 case OV5_FEAT(OV5_XIVE_LEGACY): /* Only Legacy mode */
1306 prom_debug("XIVE - legacy mode supported\n");
1307 break;
1308 default:
1309 prom_debug("Unknown xive support option: 0x%x\n", val);
1310 break;
1311 }
1312}
1313
1314static void __init prom_parse_platform_support(u8 index, u8 val,
1315 struct platform_support *support)
1316{
1317 switch (index) {
1318 case OV5_INDX(OV5_MMU_SUPPORT): /* MMU Model */
1319 prom_parse_mmu_model(val & OV5_FEAT(OV5_MMU_SUPPORT), support);
1320 break;
1321 case OV5_INDX(OV5_RADIX_GTSE): /* Radix Extensions */
1322 if (val & OV5_FEAT(OV5_RADIX_GTSE))
1323 support->radix_gtse = !prom_radix_gtse_disable;
1324 break;
1325 case OV5_INDX(OV5_XIVE_SUPPORT): /* Interrupt mode */
1326 prom_parse_xive_model(val & OV5_FEAT(OV5_XIVE_SUPPORT),
1327 support);
1328 break;
1329 }
1330}
1331
1332static void __init prom_check_platform_support(void)
1333{
1334 struct platform_support supported = {
1335 .hash_mmu = false,
1336 .radix_mmu = false,
1337 .radix_gtse = false,
1338 .xive = false
1339 };
1340 int prop_len = prom_getproplen(prom.chosen,
1341 "ibm,arch-vec-5-platform-support");
1342
1343 /*
1344 * First copy the architecture vec template
1345 *
1346 * use memcpy() instead of *vec = *vec_template so that GCC replaces it
1347 * by __memcpy() when KASAN is active
1348 */
1349 memcpy(&ibm_architecture_vec, &ibm_architecture_vec_template,
1350 sizeof(ibm_architecture_vec));
1351
1352 prom_strscpy_pad(ibm_architecture_vec.vec7.os_id, linux_banner, 256);
1353
1354 if (prop_len > 1) {
1355 int i;
1356 u8 vec[8];
1357 prom_debug("Found ibm,arch-vec-5-platform-support, len: %d\n",
1358 prop_len);
1359 if (prop_len > sizeof(vec))
1360 prom_printf("WARNING: ibm,arch-vec-5-platform-support longer than expected (len: %d)\n",
1361 prop_len);
1362 prom_getprop(prom.chosen, "ibm,arch-vec-5-platform-support", &vec, sizeof(vec));
1363 for (i = 0; i < prop_len; i += 2) {
1364 prom_debug("%d: index = 0x%x val = 0x%x\n", i / 2, vec[i], vec[i + 1]);
1365 prom_parse_platform_support(vec[i], vec[i + 1], &supported);
1366 }
1367 }
1368
1369 if (supported.radix_mmu && IS_ENABLED(CONFIG_PPC_RADIX_MMU)) {
1370 /* Radix preferred - Check if GTSE is also supported */
1371 prom_debug("Asking for radix\n");
1372 ibm_architecture_vec.vec5.mmu = OV5_FEAT(OV5_MMU_RADIX);
1373 if (supported.radix_gtse)
1374 ibm_architecture_vec.vec5.radix_ext =
1375 OV5_FEAT(OV5_RADIX_GTSE);
1376 else
1377 prom_debug("Radix GTSE isn't supported\n");
1378 } else if (supported.hash_mmu) {
1379 /* Default to hash mmu (if we can) */
1380 prom_debug("Asking for hash\n");
1381 ibm_architecture_vec.vec5.mmu = OV5_FEAT(OV5_MMU_HASH);
1382 } else {
1383 /* We're probably on a legacy hypervisor */
1384 prom_debug("Assuming legacy hash support\n");
1385 }
1386
1387 if (supported.xive) {
1388 prom_debug("Asking for XIVE\n");
1389 ibm_architecture_vec.vec5.intarch = OV5_FEAT(OV5_XIVE_EXPLOIT);
1390 }
1391}
1392
1393static void __init prom_send_capabilities(void)
1394{
1395 ihandle root;
1396 prom_arg_t ret;
1397 u32 cores;
1398
1399 /* Check ibm,arch-vec-5-platform-support and fixup vec5 if required */
1400 prom_check_platform_support();
1401
1402 root = call_prom("open", 1, 1, ADDR("/"));
1403 if (root != 0) {
1404 /* We need to tell the FW about the number of cores we support.
1405 *
1406 * To do that, we count the number of threads on the first core
1407 * (we assume this is the same for all cores) and use it to
1408 * divide NR_CPUS.
1409 */
1410
1411 cores = DIV_ROUND_UP(NR_CPUS, prom_count_smt_threads());
1412 prom_printf("Max number of cores passed to firmware: %u (NR_CPUS = %d)\n",
1413 cores, NR_CPUS);
1414
1415 ibm_architecture_vec.vec5.max_cpus = cpu_to_be32(cores);
1416
1417 /* try calling the ibm,client-architecture-support method */
1418 prom_printf("Calling ibm,client-architecture-support...");
1419 if (call_prom_ret("call-method", 3, 2, &ret,
1420 ADDR("ibm,client-architecture-support"),
1421 root,
1422 ADDR(&ibm_architecture_vec)) == 0) {
1423 /* the call exists... */
1424 if (ret)
1425 prom_printf("\nWARNING: ibm,client-architecture"
1426 "-support call FAILED!\n");
1427 call_prom("close", 1, 0, root);
1428 prom_printf(" done\n");
1429 return;
1430 }
1431 call_prom("close", 1, 0, root);
1432 prom_printf(" not implemented\n");
1433 }
1434
1435#ifdef __BIG_ENDIAN__
1436 {
1437 ihandle elfloader;
1438
1439 /* no ibm,client-architecture-support call, try the old way */
1440 elfloader = call_prom("open", 1, 1,
1441 ADDR("/packages/elf-loader"));
1442 if (elfloader == 0) {
1443 prom_printf("couldn't open /packages/elf-loader\n");
1444 return;
1445 }
1446 call_prom("call-method", 3, 1, ADDR("process-elf-header"),
1447 elfloader, ADDR(&fake_elf));
1448 call_prom("close", 1, 0, elfloader);
1449 }
1450#endif /* __BIG_ENDIAN__ */
1451}
1452#endif /* CONFIG_PPC_PSERIES */
1453
1454/*
1455 * Memory allocation strategy... our layout is normally:
1456 *
1457 * at 14Mb or more we have vmlinux, then a gap and initrd. In some
1458 * rare cases, initrd might end up being before the kernel though.
1459 * We assume this won't override the final kernel at 0, we have no
1460 * provision to handle that in this version, but it should hopefully
1461 * never happen.
1462 *
1463 * alloc_top is set to the top of RMO, eventually shrink down if the
1464 * TCEs overlap
1465 *
1466 * alloc_bottom is set to the top of kernel/initrd
1467 *
1468 * from there, allocations are done this way : rtas is allocated
1469 * topmost, and the device-tree is allocated from the bottom. We try
1470 * to grow the device-tree allocation as we progress. If we can't,
1471 * then we fail, we don't currently have a facility to restart
1472 * elsewhere, but that shouldn't be necessary.
1473 *
1474 * Note that calls to reserve_mem have to be done explicitly, memory
1475 * allocated with either alloc_up or alloc_down isn't automatically
1476 * reserved.
1477 */
1478
1479
1480/*
1481 * Allocates memory in the RMO upward from the kernel/initrd
1482 *
1483 * When align is 0, this is a special case, it means to allocate in place
1484 * at the current location of alloc_bottom or fail (that is basically
1485 * extending the previous allocation). Used for the device-tree flattening
1486 */
1487static unsigned long __init alloc_up(unsigned long size, unsigned long align)
1488{
1489 unsigned long base = alloc_bottom;
1490 unsigned long addr = 0;
1491
1492 if (align)
1493 base = ALIGN(base, align);
1494 prom_debug("%s(%lx, %lx)\n", __func__, size, align);
1495 if (ram_top == 0)
1496 prom_panic("alloc_up() called with mem not initialized\n");
1497
1498 if (align)
1499 base = ALIGN(alloc_bottom, align);
1500 else
1501 base = alloc_bottom;
1502
1503 for(; (base + size) <= alloc_top;
1504 base = ALIGN(base + 0x100000, align)) {
1505 prom_debug(" trying: 0x%lx\n\r", base);
1506 addr = (unsigned long)prom_claim(base, size, 0);
1507 if (addr != PROM_ERROR && addr != 0)
1508 break;
1509 addr = 0;
1510 if (align == 0)
1511 break;
1512 }
1513 if (addr == 0)
1514 return 0;
1515 alloc_bottom = addr + size;
1516
1517 prom_debug(" -> %lx\n", addr);
1518 prom_debug(" alloc_bottom : %lx\n", alloc_bottom);
1519 prom_debug(" alloc_top : %lx\n", alloc_top);
1520 prom_debug(" alloc_top_hi : %lx\n", alloc_top_high);
1521 prom_debug(" rmo_top : %lx\n", rmo_top);
1522 prom_debug(" ram_top : %lx\n", ram_top);
1523
1524 return addr;
1525}
1526
1527/*
1528 * Allocates memory downward, either from top of RMO, or if highmem
1529 * is set, from the top of RAM. Note that this one doesn't handle
1530 * failures. It does claim memory if highmem is not set.
1531 */
1532static unsigned long __init alloc_down(unsigned long size, unsigned long align,
1533 int highmem)
1534{
1535 unsigned long base, addr = 0;
1536
1537 prom_debug("%s(%lx, %lx, %s)\n", __func__, size, align,
1538 highmem ? "(high)" : "(low)");
1539 if (ram_top == 0)
1540 prom_panic("alloc_down() called with mem not initialized\n");
1541
1542 if (highmem) {
1543 /* Carve out storage for the TCE table. */
1544 addr = ALIGN_DOWN(alloc_top_high - size, align);
1545 if (addr <= alloc_bottom)
1546 return 0;
1547 /* Will we bump into the RMO ? If yes, check out that we
1548 * didn't overlap existing allocations there, if we did,
1549 * we are dead, we must be the first in town !
1550 */
1551 if (addr < rmo_top) {
1552 /* Good, we are first */
1553 if (alloc_top == rmo_top)
1554 alloc_top = rmo_top = addr;
1555 else
1556 return 0;
1557 }
1558 alloc_top_high = addr;
1559 goto bail;
1560 }
1561
1562 base = ALIGN_DOWN(alloc_top - size, align);
1563 for (; base > alloc_bottom;
1564 base = ALIGN_DOWN(base - 0x100000, align)) {
1565 prom_debug(" trying: 0x%lx\n\r", base);
1566 addr = (unsigned long)prom_claim(base, size, 0);
1567 if (addr != PROM_ERROR && addr != 0)
1568 break;
1569 addr = 0;
1570 }
1571 if (addr == 0)
1572 return 0;
1573 alloc_top = addr;
1574
1575 bail:
1576 prom_debug(" -> %lx\n", addr);
1577 prom_debug(" alloc_bottom : %lx\n", alloc_bottom);
1578 prom_debug(" alloc_top : %lx\n", alloc_top);
1579 prom_debug(" alloc_top_hi : %lx\n", alloc_top_high);
1580 prom_debug(" rmo_top : %lx\n", rmo_top);
1581 prom_debug(" ram_top : %lx\n", ram_top);
1582
1583 return addr;
1584}
1585
1586/*
1587 * Parse a "reg" cell
1588 */
1589static unsigned long __init prom_next_cell(int s, cell_t **cellp)
1590{
1591 cell_t *p = *cellp;
1592 unsigned long r = 0;
1593
1594 /* Ignore more than 2 cells */
1595 while (s > sizeof(unsigned long) / 4) {
1596 p++;
1597 s--;
1598 }
1599 r = be32_to_cpu(*p++);
1600#ifdef CONFIG_PPC64
1601 if (s > 1) {
1602 r <<= 32;
1603 r |= be32_to_cpu(*(p++));
1604 }
1605#endif
1606 *cellp = p;
1607 return r;
1608}
1609
1610/*
1611 * Very dumb function for adding to the memory reserve list, but
1612 * we don't need anything smarter at this point
1613 *
1614 * XXX Eventually check for collisions. They should NEVER happen.
1615 * If problems seem to show up, it would be a good start to track
1616 * them down.
1617 */
1618static void __init reserve_mem(u64 base, u64 size)
1619{
1620 u64 top = base + size;
1621 unsigned long cnt = mem_reserve_cnt;
1622
1623 if (size == 0)
1624 return;
1625
1626 /* We need to always keep one empty entry so that we
1627 * have our terminator with "size" set to 0 since we are
1628 * dumb and just copy this entire array to the boot params
1629 */
1630 base = ALIGN_DOWN(base, PAGE_SIZE);
1631 top = ALIGN(top, PAGE_SIZE);
1632 size = top - base;
1633
1634 if (cnt >= (MEM_RESERVE_MAP_SIZE - 1))
1635 prom_panic("Memory reserve map exhausted !\n");
1636 mem_reserve_map[cnt].base = cpu_to_be64(base);
1637 mem_reserve_map[cnt].size = cpu_to_be64(size);
1638 mem_reserve_cnt = cnt + 1;
1639}
1640
1641/*
1642 * Initialize memory allocation mechanism, parse "memory" nodes and
1643 * obtain that way the top of memory and RMO to setup out local allocator
1644 */
1645static void __init prom_init_mem(void)
1646{
1647 phandle node;
1648 char type[64];
1649 unsigned int plen;
1650 cell_t *p, *endp;
1651 __be32 val;
1652 u32 rac, rsc;
1653
1654 /*
1655 * We iterate the memory nodes to find
1656 * 1) top of RMO (first node)
1657 * 2) top of memory
1658 */
1659 val = cpu_to_be32(2);
1660 prom_getprop(prom.root, "#address-cells", &val, sizeof(val));
1661 rac = be32_to_cpu(val);
1662 val = cpu_to_be32(1);
1663 prom_getprop(prom.root, "#size-cells", &val, sizeof(rsc));
1664 rsc = be32_to_cpu(val);
1665 prom_debug("root_addr_cells: %x\n", rac);
1666 prom_debug("root_size_cells: %x\n", rsc);
1667
1668 prom_debug("scanning memory:\n");
1669
1670 for (node = 0; prom_next_node(&node); ) {
1671 type[0] = 0;
1672 prom_getprop(node, "device_type", type, sizeof(type));
1673
1674 if (type[0] == 0) {
1675 /*
1676 * CHRP Longtrail machines have no device_type
1677 * on the memory node, so check the name instead...
1678 */
1679 prom_getprop(node, "name", type, sizeof(type));
1680 }
1681 if (prom_strcmp(type, "memory"))
1682 continue;
1683
1684 plen = prom_getprop(node, "reg", regbuf, sizeof(regbuf));
1685 if (plen > sizeof(regbuf)) {
1686 prom_printf("memory node too large for buffer !\n");
1687 plen = sizeof(regbuf);
1688 }
1689 p = regbuf;
1690 endp = p + (plen / sizeof(cell_t));
1691
1692#ifdef DEBUG_PROM
1693 memset(prom_scratch, 0, sizeof(prom_scratch));
1694 call_prom("package-to-path", 3, 1, node, prom_scratch,
1695 sizeof(prom_scratch) - 1);
1696 prom_debug(" node %s :\n", prom_scratch);
1697#endif /* DEBUG_PROM */
1698
1699 while ((endp - p) >= (rac + rsc)) {
1700 unsigned long base, size;
1701
1702 base = prom_next_cell(rac, &p);
1703 size = prom_next_cell(rsc, &p);
1704
1705 if (size == 0)
1706 continue;
1707 prom_debug(" %lx %lx\n", base, size);
1708 if (base == 0 && (of_platform & PLATFORM_LPAR))
1709 rmo_top = size;
1710 if ((base + size) > ram_top)
1711 ram_top = base + size;
1712 }
1713 }
1714
1715 alloc_bottom = PAGE_ALIGN((unsigned long)&_end + 0x4000);
1716
1717 /*
1718 * If prom_memory_limit is set we reduce the upper limits *except* for
1719 * alloc_top_high. This must be the real top of RAM so we can put
1720 * TCE's up there.
1721 */
1722
1723 alloc_top_high = ram_top;
1724
1725 if (prom_memory_limit) {
1726 if (prom_memory_limit <= alloc_bottom) {
1727 prom_printf("Ignoring mem=%lx <= alloc_bottom.\n",
1728 prom_memory_limit);
1729 prom_memory_limit = 0;
1730 } else if (prom_memory_limit >= ram_top) {
1731 prom_printf("Ignoring mem=%lx >= ram_top.\n",
1732 prom_memory_limit);
1733 prom_memory_limit = 0;
1734 } else {
1735 ram_top = prom_memory_limit;
1736 rmo_top = min(rmo_top, prom_memory_limit);
1737 }
1738 }
1739
1740 /*
1741 * Setup our top alloc point, that is top of RMO or top of
1742 * segment 0 when running non-LPAR.
1743 * Some RS64 machines have buggy firmware where claims up at
1744 * 1GB fail. Cap at 768MB as a workaround.
1745 * Since 768MB is plenty of room, and we need to cap to something
1746 * reasonable on 32-bit, cap at 768MB on all machines.
1747 */
1748 if (!rmo_top)
1749 rmo_top = ram_top;
1750 rmo_top = min(0x30000000ul, rmo_top);
1751 alloc_top = rmo_top;
1752 alloc_top_high = ram_top;
1753
1754 /*
1755 * Check if we have an initrd after the kernel but still inside
1756 * the RMO. If we do move our bottom point to after it.
1757 */
1758 if (prom_initrd_start &&
1759 prom_initrd_start < rmo_top &&
1760 prom_initrd_end > alloc_bottom)
1761 alloc_bottom = PAGE_ALIGN(prom_initrd_end);
1762
1763 prom_printf("memory layout at init:\n");
1764 prom_printf(" memory_limit : %lx (16 MB aligned)\n",
1765 prom_memory_limit);
1766 prom_printf(" alloc_bottom : %lx\n", alloc_bottom);
1767 prom_printf(" alloc_top : %lx\n", alloc_top);
1768 prom_printf(" alloc_top_hi : %lx\n", alloc_top_high);
1769 prom_printf(" rmo_top : %lx\n", rmo_top);
1770 prom_printf(" ram_top : %lx\n", ram_top);
1771}
1772
1773static void __init prom_close_stdin(void)
1774{
1775 __be32 val;
1776 ihandle stdin;
1777
1778 if (prom_getprop(prom.chosen, "stdin", &val, sizeof(val)) > 0) {
1779 stdin = be32_to_cpu(val);
1780 call_prom("close", 1, 0, stdin);
1781 }
1782}
1783
1784#ifdef CONFIG_PPC_SVM
1785static int __init prom_rtas_hcall(uint64_t args)
1786{
1787 register uint64_t arg1 asm("r3") = H_RTAS;
1788 register uint64_t arg2 asm("r4") = args;
1789
1790 asm volatile("sc 1\n" : "=r" (arg1) :
1791 "r" (arg1),
1792 "r" (arg2) :);
1793 srr_regs_clobbered();
1794
1795 return arg1;
1796}
1797
1798static struct rtas_args __prombss os_term_args;
1799
1800static void __init prom_rtas_os_term(char *str)
1801{
1802 phandle rtas_node;
1803 __be32 val;
1804 u32 token;
1805
1806 prom_debug("%s: start...\n", __func__);
1807 rtas_node = call_prom("finddevice", 1, 1, ADDR("/rtas"));
1808 prom_debug("rtas_node: %x\n", rtas_node);
1809 if (!PHANDLE_VALID(rtas_node))
1810 return;
1811
1812 val = 0;
1813 prom_getprop(rtas_node, "ibm,os-term", &val, sizeof(val));
1814 token = be32_to_cpu(val);
1815 prom_debug("ibm,os-term: %x\n", token);
1816 if (token == 0)
1817 prom_panic("Could not get token for ibm,os-term\n");
1818 os_term_args.token = cpu_to_be32(token);
1819 os_term_args.nargs = cpu_to_be32(1);
1820 os_term_args.nret = cpu_to_be32(1);
1821 os_term_args.args[0] = cpu_to_be32(__pa(str));
1822 prom_rtas_hcall((uint64_t)&os_term_args);
1823}
1824#endif /* CONFIG_PPC_SVM */
1825
1826/*
1827 * Allocate room for and instantiate RTAS
1828 */
1829static void __init prom_instantiate_rtas(void)
1830{
1831 phandle rtas_node;
1832 ihandle rtas_inst;
1833 u32 base, entry = 0;
1834 __be32 val;
1835 u32 size = 0;
1836
1837 prom_debug("prom_instantiate_rtas: start...\n");
1838
1839 rtas_node = call_prom("finddevice", 1, 1, ADDR("/rtas"));
1840 prom_debug("rtas_node: %x\n", rtas_node);
1841 if (!PHANDLE_VALID(rtas_node))
1842 return;
1843
1844 val = 0;
1845 prom_getprop(rtas_node, "rtas-size", &val, sizeof(size));
1846 size = be32_to_cpu(val);
1847 if (size == 0)
1848 return;
1849
1850 base = alloc_down(size, PAGE_SIZE, 0);
1851 if (base == 0)
1852 prom_panic("Could not allocate memory for RTAS\n");
1853
1854 rtas_inst = call_prom("open", 1, 1, ADDR("/rtas"));
1855 if (!IHANDLE_VALID(rtas_inst)) {
1856 prom_printf("opening rtas package failed (%x)\n", rtas_inst);
1857 return;
1858 }
1859
1860 prom_printf("instantiating rtas at 0x%x...", base);
1861
1862 if (call_prom_ret("call-method", 3, 2, &entry,
1863 ADDR("instantiate-rtas"),
1864 rtas_inst, base) != 0
1865 || entry == 0) {
1866 prom_printf(" failed\n");
1867 return;
1868 }
1869 prom_printf(" done\n");
1870
1871 reserve_mem(base, size);
1872
1873 val = cpu_to_be32(base);
1874 prom_setprop(rtas_node, "/rtas", "linux,rtas-base",
1875 &val, sizeof(val));
1876 val = cpu_to_be32(entry);
1877 prom_setprop(rtas_node, "/rtas", "linux,rtas-entry",
1878 &val, sizeof(val));
1879
1880 /* Check if it supports "query-cpu-stopped-state" */
1881 if (prom_getprop(rtas_node, "query-cpu-stopped-state",
1882 &val, sizeof(val)) != PROM_ERROR)
1883 rtas_has_query_cpu_stopped = true;
1884
1885 prom_debug("rtas base = 0x%x\n", base);
1886 prom_debug("rtas entry = 0x%x\n", entry);
1887 prom_debug("rtas size = 0x%x\n", size);
1888
1889 prom_debug("prom_instantiate_rtas: end...\n");
1890}
1891
1892#ifdef CONFIG_PPC64
1893/*
1894 * Allocate room for and instantiate Stored Measurement Log (SML)
1895 */
1896static void __init prom_instantiate_sml(void)
1897{
1898 phandle ibmvtpm_node;
1899 ihandle ibmvtpm_inst;
1900 u32 entry = 0, size = 0, succ = 0;
1901 u64 base;
1902 __be32 val;
1903
1904 prom_debug("prom_instantiate_sml: start...\n");
1905
1906 ibmvtpm_node = call_prom("finddevice", 1, 1, ADDR("/vdevice/vtpm"));
1907 prom_debug("ibmvtpm_node: %x\n", ibmvtpm_node);
1908 if (!PHANDLE_VALID(ibmvtpm_node))
1909 return;
1910
1911 ibmvtpm_inst = call_prom("open", 1, 1, ADDR("/vdevice/vtpm"));
1912 if (!IHANDLE_VALID(ibmvtpm_inst)) {
1913 prom_printf("opening vtpm package failed (%x)\n", ibmvtpm_inst);
1914 return;
1915 }
1916
1917 if (prom_getprop(ibmvtpm_node, "ibm,sml-efi-reformat-supported",
1918 &val, sizeof(val)) != PROM_ERROR) {
1919 if (call_prom_ret("call-method", 2, 2, &succ,
1920 ADDR("reformat-sml-to-efi-alignment"),
1921 ibmvtpm_inst) != 0 || succ == 0) {
1922 prom_printf("Reformat SML to EFI alignment failed\n");
1923 return;
1924 }
1925
1926 if (call_prom_ret("call-method", 2, 2, &size,
1927 ADDR("sml-get-allocated-size"),
1928 ibmvtpm_inst) != 0 || size == 0) {
1929 prom_printf("SML get allocated size failed\n");
1930 return;
1931 }
1932 } else {
1933 if (call_prom_ret("call-method", 2, 2, &size,
1934 ADDR("sml-get-handover-size"),
1935 ibmvtpm_inst) != 0 || size == 0) {
1936 prom_printf("SML get handover size failed\n");
1937 return;
1938 }
1939 }
1940
1941 base = alloc_down(size, PAGE_SIZE, 0);
1942 if (base == 0)
1943 prom_panic("Could not allocate memory for sml\n");
1944
1945 prom_printf("instantiating sml at 0x%llx...", base);
1946
1947 memset((void *)base, 0, size);
1948
1949 if (call_prom_ret("call-method", 4, 2, &entry,
1950 ADDR("sml-handover"),
1951 ibmvtpm_inst, size, base) != 0 || entry == 0) {
1952 prom_printf("SML handover failed\n");
1953 return;
1954 }
1955 prom_printf(" done\n");
1956
1957 reserve_mem(base, size);
1958
1959 prom_setprop(ibmvtpm_node, "/vdevice/vtpm", "linux,sml-base",
1960 &base, sizeof(base));
1961 prom_setprop(ibmvtpm_node, "/vdevice/vtpm", "linux,sml-size",
1962 &size, sizeof(size));
1963
1964 prom_debug("sml base = 0x%llx\n", base);
1965 prom_debug("sml size = 0x%x\n", size);
1966
1967 prom_debug("prom_instantiate_sml: end...\n");
1968}
1969
1970/*
1971 * Allocate room for and initialize TCE tables
1972 */
1973#ifdef __BIG_ENDIAN__
1974static void __init prom_initialize_tce_table(void)
1975{
1976 phandle node;
1977 ihandle phb_node;
1978 char compatible[64], type[64], model[64];
1979 char *path = prom_scratch;
1980 u64 base, align;
1981 u32 minalign, minsize;
1982 u64 tce_entry, *tce_entryp;
1983 u64 local_alloc_top, local_alloc_bottom;
1984 u64 i;
1985
1986 if (prom_iommu_off)
1987 return;
1988
1989 prom_debug("starting prom_initialize_tce_table\n");
1990
1991 /* Cache current top of allocs so we reserve a single block */
1992 local_alloc_top = alloc_top_high;
1993 local_alloc_bottom = local_alloc_top;
1994
1995 /* Search all nodes looking for PHBs. */
1996 for (node = 0; prom_next_node(&node); ) {
1997 compatible[0] = 0;
1998 type[0] = 0;
1999 model[0] = 0;
2000 prom_getprop(node, "compatible",
2001 compatible, sizeof(compatible));
2002 prom_getprop(node, "device_type", type, sizeof(type));
2003 prom_getprop(node, "model", model, sizeof(model));
2004
2005 if ((type[0] == 0) || (prom_strstr(type, "pci") == NULL))
2006 continue;
2007
2008 /* Keep the old logic intact to avoid regression. */
2009 if (compatible[0] != 0) {
2010 if ((prom_strstr(compatible, "python") == NULL) &&
2011 (prom_strstr(compatible, "Speedwagon") == NULL) &&
2012 (prom_strstr(compatible, "Winnipeg") == NULL))
2013 continue;
2014 } else if (model[0] != 0) {
2015 if ((prom_strstr(model, "ython") == NULL) &&
2016 (prom_strstr(model, "peedwagon") == NULL) &&
2017 (prom_strstr(model, "innipeg") == NULL))
2018 continue;
2019 }
2020
2021 if (prom_getprop(node, "tce-table-minalign", &minalign,
2022 sizeof(minalign)) == PROM_ERROR)
2023 minalign = 0;
2024 if (prom_getprop(node, "tce-table-minsize", &minsize,
2025 sizeof(minsize)) == PROM_ERROR)
2026 minsize = 4UL << 20;
2027
2028 /*
2029 * Even though we read what OF wants, we just set the table
2030 * size to 4 MB. This is enough to map 2GB of PCI DMA space.
2031 * By doing this, we avoid the pitfalls of trying to DMA to
2032 * MMIO space and the DMA alias hole.
2033 */
2034 minsize = 4UL << 20;
2035
2036 /* Align to the greater of the align or size */
2037 align = max(minalign, minsize);
2038 base = alloc_down(minsize, align, 1);
2039 if (base == 0)
2040 prom_panic("ERROR, cannot find space for TCE table.\n");
2041 if (base < local_alloc_bottom)
2042 local_alloc_bottom = base;
2043
2044 /* It seems OF doesn't null-terminate the path :-( */
2045 memset(path, 0, sizeof(prom_scratch));
2046 /* Call OF to setup the TCE hardware */
2047 if (call_prom("package-to-path", 3, 1, node,
2048 path, sizeof(prom_scratch) - 1) == PROM_ERROR) {
2049 prom_printf("package-to-path failed\n");
2050 }
2051
2052 /* Save away the TCE table attributes for later use. */
2053 prom_setprop(node, path, "linux,tce-base", &base, sizeof(base));
2054 prom_setprop(node, path, "linux,tce-size", &minsize, sizeof(minsize));
2055
2056 prom_debug("TCE table: %s\n", path);
2057 prom_debug("\tnode = 0x%x\n", node);
2058 prom_debug("\tbase = 0x%llx\n", base);
2059 prom_debug("\tsize = 0x%x\n", minsize);
2060
2061 /* Initialize the table to have a one-to-one mapping
2062 * over the allocated size.
2063 */
2064 tce_entryp = (u64 *)base;
2065 for (i = 0; i < (minsize >> 3) ;tce_entryp++, i++) {
2066 tce_entry = (i << PAGE_SHIFT);
2067 tce_entry |= 0x3;
2068 *tce_entryp = tce_entry;
2069 }
2070
2071 prom_printf("opening PHB %s", path);
2072 phb_node = call_prom("open", 1, 1, path);
2073 if (phb_node == 0)
2074 prom_printf("... failed\n");
2075 else
2076 prom_printf("... done\n");
2077
2078 call_prom("call-method", 6, 0, ADDR("set-64-bit-addressing"),
2079 phb_node, -1, minsize,
2080 (u32) base, (u32) (base >> 32));
2081 call_prom("close", 1, 0, phb_node);
2082 }
2083
2084 reserve_mem(local_alloc_bottom, local_alloc_top - local_alloc_bottom);
2085
2086 /* These are only really needed if there is a memory limit in
2087 * effect, but we don't know so export them always. */
2088 prom_tce_alloc_start = local_alloc_bottom;
2089 prom_tce_alloc_end = local_alloc_top;
2090
2091 /* Flag the first invalid entry */
2092 prom_debug("ending prom_initialize_tce_table\n");
2093}
2094#endif /* __BIG_ENDIAN__ */
2095#endif /* CONFIG_PPC64 */
2096
2097/*
2098 * With CHRP SMP we need to use the OF to start the other processors.
2099 * We can't wait until smp_boot_cpus (the OF is trashed by then)
2100 * so we have to put the processors into a holding pattern controlled
2101 * by the kernel (not OF) before we destroy the OF.
2102 *
2103 * This uses a chunk of low memory, puts some holding pattern
2104 * code there and sends the other processors off to there until
2105 * smp_boot_cpus tells them to do something. The holding pattern
2106 * checks that address until its cpu # is there, when it is that
2107 * cpu jumps to __secondary_start(). smp_boot_cpus() takes care
2108 * of setting those values.
2109 *
2110 * We also use physical address 0x4 here to tell when a cpu
2111 * is in its holding pattern code.
2112 *
2113 * -- Cort
2114 */
2115/*
2116 * We want to reference the copy of __secondary_hold_* in the
2117 * 0 - 0x100 address range
2118 */
2119#define LOW_ADDR(x) (((unsigned long) &(x)) & 0xff)
2120
2121static void __init prom_hold_cpus(void)
2122{
2123 unsigned long i;
2124 phandle node;
2125 char type[64];
2126 unsigned long *spinloop
2127 = (void *) LOW_ADDR(__secondary_hold_spinloop);
2128 unsigned long *acknowledge
2129 = (void *) LOW_ADDR(__secondary_hold_acknowledge);
2130 unsigned long secondary_hold = LOW_ADDR(__secondary_hold);
2131
2132 /*
2133 * On pseries, if RTAS supports "query-cpu-stopped-state",
2134 * we skip this stage, the CPUs will be started by the
2135 * kernel using RTAS.
2136 */
2137 if ((of_platform == PLATFORM_PSERIES ||
2138 of_platform == PLATFORM_PSERIES_LPAR) &&
2139 rtas_has_query_cpu_stopped) {
2140 prom_printf("prom_hold_cpus: skipped\n");
2141 return;
2142 }
2143
2144 prom_debug("prom_hold_cpus: start...\n");
2145 prom_debug(" 1) spinloop = 0x%lx\n", (unsigned long)spinloop);
2146 prom_debug(" 1) *spinloop = 0x%lx\n", *spinloop);
2147 prom_debug(" 1) acknowledge = 0x%lx\n",
2148 (unsigned long)acknowledge);
2149 prom_debug(" 1) *acknowledge = 0x%lx\n", *acknowledge);
2150 prom_debug(" 1) secondary_hold = 0x%lx\n", secondary_hold);
2151
2152 /* Set the common spinloop variable, so all of the secondary cpus
2153 * will block when they are awakened from their OF spinloop.
2154 * This must occur for both SMP and non SMP kernels, since OF will
2155 * be trashed when we move the kernel.
2156 */
2157 *spinloop = 0;
2158
2159 /* look for cpus */
2160 for (node = 0; prom_next_node(&node); ) {
2161 unsigned int cpu_no;
2162 __be32 reg;
2163
2164 type[0] = 0;
2165 prom_getprop(node, "device_type", type, sizeof(type));
2166 if (prom_strcmp(type, "cpu") != 0)
2167 continue;
2168
2169 /* Skip non-configured cpus. */
2170 if (prom_getprop(node, "status", type, sizeof(type)) > 0)
2171 if (prom_strcmp(type, "okay") != 0)
2172 continue;
2173
2174 reg = cpu_to_be32(-1); /* make sparse happy */
2175 prom_getprop(node, "reg", ®, sizeof(reg));
2176 cpu_no = be32_to_cpu(reg);
2177
2178 prom_debug("cpu hw idx = %u\n", cpu_no);
2179
2180 /* Init the acknowledge var which will be reset by
2181 * the secondary cpu when it awakens from its OF
2182 * spinloop.
2183 */
2184 *acknowledge = (unsigned long)-1;
2185
2186 if (cpu_no != prom.cpu) {
2187 /* Primary Thread of non-boot cpu or any thread */
2188 prom_printf("starting cpu hw idx %u... ", cpu_no);
2189 call_prom("start-cpu", 3, 0, node,
2190 secondary_hold, cpu_no);
2191
2192 for (i = 0; (i < 100000000) &&
2193 (*acknowledge == ((unsigned long)-1)); i++ )
2194 mb();
2195
2196 if (*acknowledge == cpu_no)
2197 prom_printf("done\n");
2198 else
2199 prom_printf("failed: %lx\n", *acknowledge);
2200 }
2201#ifdef CONFIG_SMP
2202 else
2203 prom_printf("boot cpu hw idx %u\n", cpu_no);
2204#endif /* CONFIG_SMP */
2205 }
2206
2207 prom_debug("prom_hold_cpus: end...\n");
2208}
2209
2210
2211static void __init prom_init_client_services(unsigned long pp)
2212{
2213 /* Get a handle to the prom entry point before anything else */
2214 prom_entry = pp;
2215
2216 /* get a handle for the stdout device */
2217 prom.chosen = call_prom("finddevice", 1, 1, ADDR("/chosen"));
2218 if (!PHANDLE_VALID(prom.chosen))
2219 prom_panic("cannot find chosen"); /* msg won't be printed :( */
2220
2221 /* get device tree root */
2222 prom.root = call_prom("finddevice", 1, 1, ADDR("/"));
2223 if (!PHANDLE_VALID(prom.root))
2224 prom_panic("cannot find device tree root"); /* msg won't be printed :( */
2225
2226 prom.mmumap = 0;
2227}
2228
2229#ifdef CONFIG_PPC32
2230/*
2231 * For really old powermacs, we need to map things we claim.
2232 * For that, we need the ihandle of the mmu.
2233 * Also, on the longtrail, we need to work around other bugs.
2234 */
2235static void __init prom_find_mmu(void)
2236{
2237 phandle oprom;
2238 char version[64];
2239
2240 oprom = call_prom("finddevice", 1, 1, ADDR("/openprom"));
2241 if (!PHANDLE_VALID(oprom))
2242 return;
2243 if (prom_getprop(oprom, "model", version, sizeof(version)) <= 0)
2244 return;
2245 version[sizeof(version) - 1] = 0;
2246 /* XXX might need to add other versions here */
2247 if (prom_strcmp(version, "Open Firmware, 1.0.5") == 0)
2248 of_workarounds = OF_WA_CLAIM;
2249 else if (prom_strncmp(version, "FirmWorks,3.", 12) == 0) {
2250 of_workarounds = OF_WA_CLAIM | OF_WA_LONGTRAIL;
2251 call_prom("interpret", 1, 1, "dev /memory 0 to allow-reclaim");
2252 } else
2253 return;
2254 prom.memory = call_prom("open", 1, 1, ADDR("/memory"));
2255 prom_getprop(prom.chosen, "mmu", &prom.mmumap,
2256 sizeof(prom.mmumap));
2257 prom.mmumap = be32_to_cpu(prom.mmumap);
2258 if (!IHANDLE_VALID(prom.memory) || !IHANDLE_VALID(prom.mmumap))
2259 of_workarounds &= ~OF_WA_CLAIM; /* hmmm */
2260}
2261#else
2262#define prom_find_mmu()
2263#endif
2264
2265static void __init prom_init_stdout(void)
2266{
2267 char *path = of_stdout_device;
2268 char type[16];
2269 phandle stdout_node;
2270 __be32 val;
2271
2272 if (prom_getprop(prom.chosen, "stdout", &val, sizeof(val)) <= 0)
2273 prom_panic("cannot find stdout");
2274
2275 prom.stdout = be32_to_cpu(val);
2276
2277 /* Get the full OF pathname of the stdout device */
2278 memset(path, 0, 256);
2279 call_prom("instance-to-path", 3, 1, prom.stdout, path, 255);
2280 prom_printf("OF stdout device is: %s\n", of_stdout_device);
2281 prom_setprop(prom.chosen, "/chosen", "linux,stdout-path",
2282 path, prom_strlen(path) + 1);
2283
2284 /* instance-to-package fails on PA-Semi */
2285 stdout_node = call_prom("instance-to-package", 1, 1, prom.stdout);
2286 if (stdout_node != PROM_ERROR) {
2287 val = cpu_to_be32(stdout_node);
2288
2289 /* If it's a display, note it */
2290 memset(type, 0, sizeof(type));
2291 prom_getprop(stdout_node, "device_type", type, sizeof(type));
2292 if (prom_strcmp(type, "display") == 0)
2293 prom_setprop(stdout_node, path, "linux,boot-display", NULL, 0);
2294 }
2295}
2296
2297static int __init prom_find_machine_type(void)
2298{
2299 static char compat[256] __prombss;
2300 int len, i = 0;
2301#ifdef CONFIG_PPC64
2302 phandle rtas;
2303 int x;
2304#endif
2305
2306 /* Look for a PowerMac or a Cell */
2307 len = prom_getprop(prom.root, "compatible",
2308 compat, sizeof(compat)-1);
2309 if (len > 0) {
2310 compat[len] = 0;
2311 while (i < len) {
2312 char *p = &compat[i];
2313 int sl = prom_strlen(p);
2314 if (sl == 0)
2315 break;
2316 if (prom_strstr(p, "Power Macintosh") ||
2317 prom_strstr(p, "MacRISC"))
2318 return PLATFORM_POWERMAC;
2319#ifdef CONFIG_PPC64
2320 /* We must make sure we don't detect the IBM Cell
2321 * blades as pSeries due to some firmware issues,
2322 * so we do it here.
2323 */
2324 if (prom_strstr(p, "IBM,CBEA") ||
2325 prom_strstr(p, "IBM,CPBW-1.0"))
2326 return PLATFORM_GENERIC;
2327#endif /* CONFIG_PPC64 */
2328 i += sl + 1;
2329 }
2330 }
2331#ifdef CONFIG_PPC64
2332 /* Try to figure out if it's an IBM pSeries or any other
2333 * PAPR compliant platform. We assume it is if :
2334 * - /device_type is "chrp" (please, do NOT use that for future
2335 * non-IBM designs !
2336 * - it has /rtas
2337 */
2338 len = prom_getprop(prom.root, "device_type",
2339 compat, sizeof(compat)-1);
2340 if (len <= 0)
2341 return PLATFORM_GENERIC;
2342 if (prom_strcmp(compat, "chrp"))
2343 return PLATFORM_GENERIC;
2344
2345 /* Default to pSeries. We need to know if we are running LPAR */
2346 rtas = call_prom("finddevice", 1, 1, ADDR("/rtas"));
2347 if (!PHANDLE_VALID(rtas))
2348 return PLATFORM_GENERIC;
2349 x = prom_getproplen(rtas, "ibm,hypertas-functions");
2350 if (x != PROM_ERROR) {
2351 prom_debug("Hypertas detected, assuming LPAR !\n");
2352 return PLATFORM_PSERIES_LPAR;
2353 }
2354 return PLATFORM_PSERIES;
2355#else
2356 return PLATFORM_GENERIC;
2357#endif
2358}
2359
2360static int __init prom_set_color(ihandle ih, int i, int r, int g, int b)
2361{
2362 return call_prom("call-method", 6, 1, ADDR("color!"), ih, i, b, g, r);
2363}
2364
2365/*
2366 * If we have a display that we don't know how to drive,
2367 * we will want to try to execute OF's open method for it
2368 * later. However, OF will probably fall over if we do that
2369 * we've taken over the MMU.
2370 * So we check whether we will need to open the display,
2371 * and if so, open it now.
2372 */
2373static void __init prom_check_displays(void)
2374{
2375 char type[16], *path;
2376 phandle node;
2377 ihandle ih;
2378 int i;
2379
2380 static const unsigned char default_colors[] __initconst = {
2381 0x00, 0x00, 0x00,
2382 0x00, 0x00, 0xaa,
2383 0x00, 0xaa, 0x00,
2384 0x00, 0xaa, 0xaa,
2385 0xaa, 0x00, 0x00,
2386 0xaa, 0x00, 0xaa,
2387 0xaa, 0xaa, 0x00,
2388 0xaa, 0xaa, 0xaa,
2389 0x55, 0x55, 0x55,
2390 0x55, 0x55, 0xff,
2391 0x55, 0xff, 0x55,
2392 0x55, 0xff, 0xff,
2393 0xff, 0x55, 0x55,
2394 0xff, 0x55, 0xff,
2395 0xff, 0xff, 0x55,
2396 0xff, 0xff, 0xff
2397 };
2398 const unsigned char *clut;
2399
2400 prom_debug("Looking for displays\n");
2401 for (node = 0; prom_next_node(&node); ) {
2402 memset(type, 0, sizeof(type));
2403 prom_getprop(node, "device_type", type, sizeof(type));
2404 if (prom_strcmp(type, "display") != 0)
2405 continue;
2406
2407 /* It seems OF doesn't null-terminate the path :-( */
2408 path = prom_scratch;
2409 memset(path, 0, sizeof(prom_scratch));
2410
2411 /*
2412 * leave some room at the end of the path for appending extra
2413 * arguments
2414 */
2415 if (call_prom("package-to-path", 3, 1, node, path,
2416 sizeof(prom_scratch) - 10) == PROM_ERROR)
2417 continue;
2418 prom_printf("found display : %s, opening... ", path);
2419
2420 ih = call_prom("open", 1, 1, path);
2421 if (ih == 0) {
2422 prom_printf("failed\n");
2423 continue;
2424 }
2425
2426 /* Success */
2427 prom_printf("done\n");
2428 prom_setprop(node, path, "linux,opened", NULL, 0);
2429
2430 /* Setup a usable color table when the appropriate
2431 * method is available. Should update this to set-colors */
2432 clut = default_colors;
2433 for (i = 0; i < 16; i++, clut += 3)
2434 if (prom_set_color(ih, i, clut[0], clut[1],
2435 clut[2]) != 0)
2436 break;
2437
2438#ifdef CONFIG_LOGO_LINUX_CLUT224
2439 clut = PTRRELOC(logo_linux_clut224.clut);
2440 for (i = 0; i < logo_linux_clut224.clutsize; i++, clut += 3)
2441 if (prom_set_color(ih, i + 32, clut[0], clut[1],
2442 clut[2]) != 0)
2443 break;
2444#endif /* CONFIG_LOGO_LINUX_CLUT224 */
2445
2446#ifdef CONFIG_PPC_EARLY_DEBUG_BOOTX
2447 if (prom_getprop(node, "linux,boot-display", NULL, 0) !=
2448 PROM_ERROR) {
2449 u32 width, height, pitch, addr;
2450
2451 prom_printf("Setting btext !\n");
2452
2453 if (prom_getprop(node, "width", &width, 4) == PROM_ERROR)
2454 return;
2455
2456 if (prom_getprop(node, "height", &height, 4) == PROM_ERROR)
2457 return;
2458
2459 if (prom_getprop(node, "linebytes", &pitch, 4) == PROM_ERROR)
2460 return;
2461
2462 if (prom_getprop(node, "address", &addr, 4) == PROM_ERROR)
2463 return;
2464
2465 prom_printf("W=%d H=%d LB=%d addr=0x%x\n",
2466 width, height, pitch, addr);
2467 btext_setup_display(width, height, 8, pitch, addr);
2468 btext_prepare_BAT();
2469 }
2470#endif /* CONFIG_PPC_EARLY_DEBUG_BOOTX */
2471 }
2472}
2473
2474
2475/* Return (relocated) pointer to this much memory: moves initrd if reqd. */
2476static void __init *make_room(unsigned long *mem_start, unsigned long *mem_end,
2477 unsigned long needed, unsigned long align)
2478{
2479 void *ret;
2480
2481 *mem_start = ALIGN(*mem_start, align);
2482 while ((*mem_start + needed) > *mem_end) {
2483 unsigned long room, chunk;
2484
2485 prom_debug("Chunk exhausted, claiming more at %lx...\n",
2486 alloc_bottom);
2487 room = alloc_top - alloc_bottom;
2488 if (room > DEVTREE_CHUNK_SIZE)
2489 room = DEVTREE_CHUNK_SIZE;
2490 if (room < PAGE_SIZE)
2491 prom_panic("No memory for flatten_device_tree "
2492 "(no room)\n");
2493 chunk = alloc_up(room, 0);
2494 if (chunk == 0)
2495 prom_panic("No memory for flatten_device_tree "
2496 "(claim failed)\n");
2497 *mem_end = chunk + room;
2498 }
2499
2500 ret = (void *)*mem_start;
2501 *mem_start += needed;
2502
2503 return ret;
2504}
2505
2506#define dt_push_token(token, mem_start, mem_end) do { \
2507 void *room = make_room(mem_start, mem_end, 4, 4); \
2508 *(__be32 *)room = cpu_to_be32(token); \
2509 } while(0)
2510
2511static unsigned long __init dt_find_string(char *str)
2512{
2513 char *s, *os;
2514
2515 s = os = (char *)dt_string_start;
2516 s += 4;
2517 while (s < (char *)dt_string_end) {
2518 if (prom_strcmp(s, str) == 0)
2519 return s - os;
2520 s += prom_strlen(s) + 1;
2521 }
2522 return 0;
2523}
2524
2525/*
2526 * The Open Firmware 1275 specification states properties must be 31 bytes or
2527 * less, however not all firmwares obey this. Make it 64 bytes to be safe.
2528 */
2529#define MAX_PROPERTY_NAME 64
2530
2531static void __init scan_dt_build_strings(phandle node,
2532 unsigned long *mem_start,
2533 unsigned long *mem_end)
2534{
2535 char *prev_name, *namep, *sstart;
2536 unsigned long soff;
2537 phandle child;
2538
2539 sstart = (char *)dt_string_start;
2540
2541 /* get and store all property names */
2542 prev_name = "";
2543 for (;;) {
2544 /* 64 is max len of name including nul. */
2545 namep = make_room(mem_start, mem_end, MAX_PROPERTY_NAME, 1);
2546 if (call_prom("nextprop", 3, 1, node, prev_name, namep) != 1) {
2547 /* No more nodes: unwind alloc */
2548 *mem_start = (unsigned long)namep;
2549 break;
2550 }
2551
2552 /* skip "name" */
2553 if (prom_strcmp(namep, "name") == 0) {
2554 *mem_start = (unsigned long)namep;
2555 prev_name = "name";
2556 continue;
2557 }
2558 /* get/create string entry */
2559 soff = dt_find_string(namep);
2560 if (soff != 0) {
2561 *mem_start = (unsigned long)namep;
2562 namep = sstart + soff;
2563 } else {
2564 /* Trim off some if we can */
2565 *mem_start = (unsigned long)namep + prom_strlen(namep) + 1;
2566 dt_string_end = *mem_start;
2567 }
2568 prev_name = namep;
2569 }
2570
2571 /* do all our children */
2572 child = call_prom("child", 1, 1, node);
2573 while (child != 0) {
2574 scan_dt_build_strings(child, mem_start, mem_end);
2575 child = call_prom("peer", 1, 1, child);
2576 }
2577}
2578
2579static void __init scan_dt_build_struct(phandle node, unsigned long *mem_start,
2580 unsigned long *mem_end)
2581{
2582 phandle child;
2583 char *namep, *prev_name, *sstart, *p, *ep, *lp, *path;
2584 unsigned long soff;
2585 unsigned char *valp;
2586 static char pname[MAX_PROPERTY_NAME] __prombss;
2587 int l, room, has_phandle = 0;
2588
2589 dt_push_token(OF_DT_BEGIN_NODE, mem_start, mem_end);
2590
2591 /* get the node's full name */
2592 namep = (char *)*mem_start;
2593 room = *mem_end - *mem_start;
2594 if (room > 255)
2595 room = 255;
2596 l = call_prom("package-to-path", 3, 1, node, namep, room);
2597 if (l >= 0) {
2598 /* Didn't fit? Get more room. */
2599 if (l >= room) {
2600 if (l >= *mem_end - *mem_start)
2601 namep = make_room(mem_start, mem_end, l+1, 1);
2602 call_prom("package-to-path", 3, 1, node, namep, l);
2603 }
2604 namep[l] = '\0';
2605
2606 /* Fixup an Apple bug where they have bogus \0 chars in the
2607 * middle of the path in some properties, and extract
2608 * the unit name (everything after the last '/').
2609 */
2610 for (lp = p = namep, ep = namep + l; p < ep; p++) {
2611 if (*p == '/')
2612 lp = namep;
2613 else if (*p != 0)
2614 *lp++ = *p;
2615 }
2616 *lp = 0;
2617 *mem_start = ALIGN((unsigned long)lp + 1, 4);
2618 }
2619
2620 /* get it again for debugging */
2621 path = prom_scratch;
2622 memset(path, 0, sizeof(prom_scratch));
2623 call_prom("package-to-path", 3, 1, node, path, sizeof(prom_scratch) - 1);
2624
2625 /* get and store all properties */
2626 prev_name = "";
2627 sstart = (char *)dt_string_start;
2628 for (;;) {
2629 if (call_prom("nextprop", 3, 1, node, prev_name,
2630 pname) != 1)
2631 break;
2632
2633 /* skip "name" */
2634 if (prom_strcmp(pname, "name") == 0) {
2635 prev_name = "name";
2636 continue;
2637 }
2638
2639 /* find string offset */
2640 soff = dt_find_string(pname);
2641 if (soff == 0) {
2642 prom_printf("WARNING: Can't find string index for"
2643 " <%s>, node %s\n", pname, path);
2644 break;
2645 }
2646 prev_name = sstart + soff;
2647
2648 /* get length */
2649 l = call_prom("getproplen", 2, 1, node, pname);
2650
2651 /* sanity checks */
2652 if (l == PROM_ERROR)
2653 continue;
2654
2655 /* push property head */
2656 dt_push_token(OF_DT_PROP, mem_start, mem_end);
2657 dt_push_token(l, mem_start, mem_end);
2658 dt_push_token(soff, mem_start, mem_end);
2659
2660 /* push property content */
2661 valp = make_room(mem_start, mem_end, l, 4);
2662 call_prom("getprop", 4, 1, node, pname, valp, l);
2663 *mem_start = ALIGN(*mem_start, 4);
2664
2665 if (!prom_strcmp(pname, "phandle"))
2666 has_phandle = 1;
2667 }
2668
2669 /* Add a "phandle" property if none already exist */
2670 if (!has_phandle) {
2671 soff = dt_find_string("phandle");
2672 if (soff == 0)
2673 prom_printf("WARNING: Can't find string index for <phandle> node %s\n", path);
2674 else {
2675 dt_push_token(OF_DT_PROP, mem_start, mem_end);
2676 dt_push_token(4, mem_start, mem_end);
2677 dt_push_token(soff, mem_start, mem_end);
2678 valp = make_room(mem_start, mem_end, 4, 4);
2679 *(__be32 *)valp = cpu_to_be32(node);
2680 }
2681 }
2682
2683 /* do all our children */
2684 child = call_prom("child", 1, 1, node);
2685 while (child != 0) {
2686 scan_dt_build_struct(child, mem_start, mem_end);
2687 child = call_prom("peer", 1, 1, child);
2688 }
2689
2690 dt_push_token(OF_DT_END_NODE, mem_start, mem_end);
2691}
2692
2693static void __init flatten_device_tree(void)
2694{
2695 phandle root;
2696 unsigned long mem_start, mem_end, room;
2697 struct boot_param_header *hdr;
2698 char *namep;
2699 u64 *rsvmap;
2700
2701 /*
2702 * Check how much room we have between alloc top & bottom (+/- a
2703 * few pages), crop to 1MB, as this is our "chunk" size
2704 */
2705 room = alloc_top - alloc_bottom - 0x4000;
2706 if (room > DEVTREE_CHUNK_SIZE)
2707 room = DEVTREE_CHUNK_SIZE;
2708 prom_debug("starting device tree allocs at %lx\n", alloc_bottom);
2709
2710 /* Now try to claim that */
2711 mem_start = (unsigned long)alloc_up(room, PAGE_SIZE);
2712 if (mem_start == 0)
2713 prom_panic("Can't allocate initial device-tree chunk\n");
2714 mem_end = mem_start + room;
2715
2716 /* Get root of tree */
2717 root = call_prom("peer", 1, 1, (phandle)0);
2718 if (root == (phandle)0)
2719 prom_panic ("couldn't get device tree root\n");
2720
2721 /* Build header and make room for mem rsv map */
2722 mem_start = ALIGN(mem_start, 4);
2723 hdr = make_room(&mem_start, &mem_end,
2724 sizeof(struct boot_param_header), 4);
2725 dt_header_start = (unsigned long)hdr;
2726 rsvmap = make_room(&mem_start, &mem_end, sizeof(mem_reserve_map), 8);
2727
2728 /* Start of strings */
2729 mem_start = PAGE_ALIGN(mem_start);
2730 dt_string_start = mem_start;
2731 mem_start += 4; /* hole */
2732
2733 /* Add "phandle" in there, we'll need it */
2734 namep = make_room(&mem_start, &mem_end, 16, 1);
2735 prom_strscpy_pad(namep, "phandle", sizeof("phandle"));
2736 mem_start = (unsigned long)namep + prom_strlen(namep) + 1;
2737
2738 /* Build string array */
2739 prom_printf("Building dt strings...\n");
2740 scan_dt_build_strings(root, &mem_start, &mem_end);
2741 dt_string_end = mem_start;
2742
2743 /* Build structure */
2744 mem_start = PAGE_ALIGN(mem_start);
2745 dt_struct_start = mem_start;
2746 prom_printf("Building dt structure...\n");
2747 scan_dt_build_struct(root, &mem_start, &mem_end);
2748 dt_push_token(OF_DT_END, &mem_start, &mem_end);
2749 dt_struct_end = PAGE_ALIGN(mem_start);
2750
2751 /* Finish header */
2752 hdr->boot_cpuid_phys = cpu_to_be32(prom.cpu);
2753 hdr->magic = cpu_to_be32(OF_DT_HEADER);
2754 hdr->totalsize = cpu_to_be32(dt_struct_end - dt_header_start);
2755 hdr->off_dt_struct = cpu_to_be32(dt_struct_start - dt_header_start);
2756 hdr->off_dt_strings = cpu_to_be32(dt_string_start - dt_header_start);
2757 hdr->dt_strings_size = cpu_to_be32(dt_string_end - dt_string_start);
2758 hdr->off_mem_rsvmap = cpu_to_be32(((unsigned long)rsvmap) - dt_header_start);
2759 hdr->version = cpu_to_be32(OF_DT_VERSION);
2760 /* Version 16 is not backward compatible */
2761 hdr->last_comp_version = cpu_to_be32(0x10);
2762
2763 /* Copy the reserve map in */
2764 memcpy(rsvmap, mem_reserve_map, sizeof(mem_reserve_map));
2765
2766#ifdef DEBUG_PROM
2767 {
2768 int i;
2769 prom_printf("reserved memory map:\n");
2770 for (i = 0; i < mem_reserve_cnt; i++)
2771 prom_printf(" %llx - %llx\n",
2772 be64_to_cpu(mem_reserve_map[i].base),
2773 be64_to_cpu(mem_reserve_map[i].size));
2774 }
2775#endif
2776 /* Bump mem_reserve_cnt to cause further reservations to fail
2777 * since it's too late.
2778 */
2779 mem_reserve_cnt = MEM_RESERVE_MAP_SIZE;
2780
2781 prom_printf("Device tree strings 0x%lx -> 0x%lx\n",
2782 dt_string_start, dt_string_end);
2783 prom_printf("Device tree struct 0x%lx -> 0x%lx\n",
2784 dt_struct_start, dt_struct_end);
2785}
2786
2787#ifdef CONFIG_PPC_MAPLE
2788/* PIBS Version 1.05.0000 04/26/2005 has an incorrect /ht/isa/ranges property.
2789 * The values are bad, and it doesn't even have the right number of cells. */
2790static void __init fixup_device_tree_maple(void)
2791{
2792 phandle isa;
2793 u32 rloc = 0x01002000; /* IO space; PCI device = 4 */
2794 u32 isa_ranges[6];
2795 char *name;
2796
2797 name = "/ht@0/isa@4";
2798 isa = call_prom("finddevice", 1, 1, ADDR(name));
2799 if (!PHANDLE_VALID(isa)) {
2800 name = "/ht@0/isa@6";
2801 isa = call_prom("finddevice", 1, 1, ADDR(name));
2802 rloc = 0x01003000; /* IO space; PCI device = 6 */
2803 }
2804 if (!PHANDLE_VALID(isa))
2805 return;
2806
2807 if (prom_getproplen(isa, "ranges") != 12)
2808 return;
2809 if (prom_getprop(isa, "ranges", isa_ranges, sizeof(isa_ranges))
2810 == PROM_ERROR)
2811 return;
2812
2813 if (isa_ranges[0] != 0x1 ||
2814 isa_ranges[1] != 0xf4000000 ||
2815 isa_ranges[2] != 0x00010000)
2816 return;
2817
2818 prom_printf("Fixing up bogus ISA range on Maple/Apache...\n");
2819
2820 isa_ranges[0] = 0x1;
2821 isa_ranges[1] = 0x0;
2822 isa_ranges[2] = rloc;
2823 isa_ranges[3] = 0x0;
2824 isa_ranges[4] = 0x0;
2825 isa_ranges[5] = 0x00010000;
2826 prom_setprop(isa, name, "ranges",
2827 isa_ranges, sizeof(isa_ranges));
2828}
2829
2830#define CPC925_MC_START 0xf8000000
2831#define CPC925_MC_LENGTH 0x1000000
2832/* The values for memory-controller don't have right number of cells */
2833static void __init fixup_device_tree_maple_memory_controller(void)
2834{
2835 phandle mc;
2836 u32 mc_reg[4];
2837 char *name = "/hostbridge@f8000000";
2838 u32 ac, sc;
2839
2840 mc = call_prom("finddevice", 1, 1, ADDR(name));
2841 if (!PHANDLE_VALID(mc))
2842 return;
2843
2844 if (prom_getproplen(mc, "reg") != 8)
2845 return;
2846
2847 prom_getprop(prom.root, "#address-cells", &ac, sizeof(ac));
2848 prom_getprop(prom.root, "#size-cells", &sc, sizeof(sc));
2849 if ((ac != 2) || (sc != 2))
2850 return;
2851
2852 if (prom_getprop(mc, "reg", mc_reg, sizeof(mc_reg)) == PROM_ERROR)
2853 return;
2854
2855 if (mc_reg[0] != CPC925_MC_START || mc_reg[1] != CPC925_MC_LENGTH)
2856 return;
2857
2858 prom_printf("Fixing up bogus hostbridge on Maple...\n");
2859
2860 mc_reg[0] = 0x0;
2861 mc_reg[1] = CPC925_MC_START;
2862 mc_reg[2] = 0x0;
2863 mc_reg[3] = CPC925_MC_LENGTH;
2864 prom_setprop(mc, name, "reg", mc_reg, sizeof(mc_reg));
2865}
2866#else
2867#define fixup_device_tree_maple()
2868#define fixup_device_tree_maple_memory_controller()
2869#endif
2870
2871#ifdef CONFIG_PPC_CHRP
2872/*
2873 * Pegasos and BriQ lacks the "ranges" property in the isa node
2874 * Pegasos needs decimal IRQ 14/15, not hexadecimal
2875 * Pegasos has the IDE configured in legacy mode, but advertised as native
2876 */
2877static void __init fixup_device_tree_chrp(void)
2878{
2879 phandle ph;
2880 u32 prop[6];
2881 u32 rloc = 0x01006000; /* IO space; PCI device = 12 */
2882 char *name;
2883 int rc;
2884
2885 name = "/pci@80000000/isa@c";
2886 ph = call_prom("finddevice", 1, 1, ADDR(name));
2887 if (!PHANDLE_VALID(ph)) {
2888 name = "/pci@ff500000/isa@6";
2889 ph = call_prom("finddevice", 1, 1, ADDR(name));
2890 rloc = 0x01003000; /* IO space; PCI device = 6 */
2891 }
2892 if (PHANDLE_VALID(ph)) {
2893 rc = prom_getproplen(ph, "ranges");
2894 if (rc == 0 || rc == PROM_ERROR) {
2895 prom_printf("Fixing up missing ISA range on Pegasos...\n");
2896
2897 prop[0] = 0x1;
2898 prop[1] = 0x0;
2899 prop[2] = rloc;
2900 prop[3] = 0x0;
2901 prop[4] = 0x0;
2902 prop[5] = 0x00010000;
2903 prom_setprop(ph, name, "ranges", prop, sizeof(prop));
2904 }
2905 }
2906
2907 name = "/pci@80000000/ide@C,1";
2908 ph = call_prom("finddevice", 1, 1, ADDR(name));
2909 if (PHANDLE_VALID(ph)) {
2910 prom_printf("Fixing up IDE interrupt on Pegasos...\n");
2911 prop[0] = 14;
2912 prop[1] = 0x0;
2913 prom_setprop(ph, name, "interrupts", prop, 2*sizeof(u32));
2914 prom_printf("Fixing up IDE class-code on Pegasos...\n");
2915 rc = prom_getprop(ph, "class-code", prop, sizeof(u32));
2916 if (rc == sizeof(u32)) {
2917 prop[0] &= ~0x5;
2918 prom_setprop(ph, name, "class-code", prop, sizeof(u32));
2919 }
2920 }
2921}
2922#else
2923#define fixup_device_tree_chrp()
2924#endif
2925
2926#if defined(CONFIG_PPC64) && defined(CONFIG_PPC_PMAC)
2927static void __init fixup_device_tree_pmac(void)
2928{
2929 phandle u3, i2c, mpic;
2930 u32 u3_rev;
2931 u32 interrupts[2];
2932 u32 parent;
2933
2934 /* Some G5s have a missing interrupt definition, fix it up here */
2935 u3 = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000"));
2936 if (!PHANDLE_VALID(u3))
2937 return;
2938 i2c = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/i2c@f8001000"));
2939 if (!PHANDLE_VALID(i2c))
2940 return;
2941 mpic = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/mpic@f8040000"));
2942 if (!PHANDLE_VALID(mpic))
2943 return;
2944
2945 /* check if proper rev of u3 */
2946 if (prom_getprop(u3, "device-rev", &u3_rev, sizeof(u3_rev))
2947 == PROM_ERROR)
2948 return;
2949 if (u3_rev < 0x35 || u3_rev > 0x39)
2950 return;
2951 /* does it need fixup ? */
2952 if (prom_getproplen(i2c, "interrupts") > 0)
2953 return;
2954
2955 prom_printf("fixing up bogus interrupts for u3 i2c...\n");
2956
2957 /* interrupt on this revision of u3 is number 0 and level */
2958 interrupts[0] = 0;
2959 interrupts[1] = 1;
2960 prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupts",
2961 &interrupts, sizeof(interrupts));
2962 parent = (u32)mpic;
2963 prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupt-parent",
2964 &parent, sizeof(parent));
2965}
2966#else
2967#define fixup_device_tree_pmac()
2968#endif
2969
2970#ifdef CONFIG_PPC_EFIKA
2971/*
2972 * The MPC5200 FEC driver requires an phy-handle property to tell it how
2973 * to talk to the phy. If the phy-handle property is missing, then this
2974 * function is called to add the appropriate nodes and link it to the
2975 * ethernet node.
2976 */
2977static void __init fixup_device_tree_efika_add_phy(void)
2978{
2979 u32 node;
2980 char prop[64];
2981 int rv;
2982
2983 /* Check if /builtin/ethernet exists - bail if it doesn't */
2984 node = call_prom("finddevice", 1, 1, ADDR("/builtin/ethernet"));
2985 if (!PHANDLE_VALID(node))
2986 return;
2987
2988 /* Check if the phy-handle property exists - bail if it does */
2989 rv = prom_getprop(node, "phy-handle", prop, sizeof(prop));
2990 if (rv <= 0)
2991 return;
2992
2993 /*
2994 * At this point the ethernet device doesn't have a phy described.
2995 * Now we need to add the missing phy node and linkage
2996 */
2997
2998 /* Check for an MDIO bus node - if missing then create one */
2999 node = call_prom("finddevice", 1, 1, ADDR("/builtin/mdio"));
3000 if (!PHANDLE_VALID(node)) {
3001 prom_printf("Adding Ethernet MDIO node\n");
3002 call_prom("interpret", 1, 1,
3003 " s\" /builtin\" find-device"
3004 " new-device"
3005 " 1 encode-int s\" #address-cells\" property"
3006 " 0 encode-int s\" #size-cells\" property"
3007 " s\" mdio\" device-name"
3008 " s\" fsl,mpc5200b-mdio\" encode-string"
3009 " s\" compatible\" property"
3010 " 0xf0003000 0x400 reg"
3011 " 0x2 encode-int"
3012 " 0x5 encode-int encode+"
3013 " 0x3 encode-int encode+"
3014 " s\" interrupts\" property"
3015 " finish-device");
3016 }
3017
3018 /* Check for a PHY device node - if missing then create one and
3019 * give it's phandle to the ethernet node */
3020 node = call_prom("finddevice", 1, 1,
3021 ADDR("/builtin/mdio/ethernet-phy"));
3022 if (!PHANDLE_VALID(node)) {
3023 prom_printf("Adding Ethernet PHY node\n");
3024 call_prom("interpret", 1, 1,
3025 " s\" /builtin/mdio\" find-device"
3026 " new-device"
3027 " s\" ethernet-phy\" device-name"
3028 " 0x10 encode-int s\" reg\" property"
3029 " my-self"
3030 " ihandle>phandle"
3031 " finish-device"
3032 " s\" /builtin/ethernet\" find-device"
3033 " encode-int"
3034 " s\" phy-handle\" property"
3035 " device-end");
3036 }
3037}
3038
3039static void __init fixup_device_tree_efika(void)
3040{
3041 int sound_irq[3] = { 2, 2, 0 };
3042 int bcomm_irq[3*16] = { 3,0,0, 3,1,0, 3,2,0, 3,3,0,
3043 3,4,0, 3,5,0, 3,6,0, 3,7,0,
3044 3,8,0, 3,9,0, 3,10,0, 3,11,0,
3045 3,12,0, 3,13,0, 3,14,0, 3,15,0 };
3046 u32 node;
3047 char prop[64];
3048 int rv, len;
3049
3050 /* Check if we're really running on a EFIKA */
3051 node = call_prom("finddevice", 1, 1, ADDR("/"));
3052 if (!PHANDLE_VALID(node))
3053 return;
3054
3055 rv = prom_getprop(node, "model", prop, sizeof(prop));
3056 if (rv == PROM_ERROR)
3057 return;
3058 if (prom_strcmp(prop, "EFIKA5K2"))
3059 return;
3060
3061 prom_printf("Applying EFIKA device tree fixups\n");
3062
3063 /* Claiming to be 'chrp' is death */
3064 node = call_prom("finddevice", 1, 1, ADDR("/"));
3065 rv = prom_getprop(node, "device_type", prop, sizeof(prop));
3066 if (rv != PROM_ERROR && (prom_strcmp(prop, "chrp") == 0))
3067 prom_setprop(node, "/", "device_type", "efika", sizeof("efika"));
3068
3069 /* CODEGEN,description is exposed in /proc/cpuinfo so
3070 fix that too */
3071 rv = prom_getprop(node, "CODEGEN,description", prop, sizeof(prop));
3072 if (rv != PROM_ERROR && (prom_strstr(prop, "CHRP")))
3073 prom_setprop(node, "/", "CODEGEN,description",
3074 "Efika 5200B PowerPC System",
3075 sizeof("Efika 5200B PowerPC System"));
3076
3077 /* Fixup bestcomm interrupts property */
3078 node = call_prom("finddevice", 1, 1, ADDR("/builtin/bestcomm"));
3079 if (PHANDLE_VALID(node)) {
3080 len = prom_getproplen(node, "interrupts");
3081 if (len == 12) {
3082 prom_printf("Fixing bestcomm interrupts property\n");
3083 prom_setprop(node, "/builtin/bestcom", "interrupts",
3084 bcomm_irq, sizeof(bcomm_irq));
3085 }
3086 }
3087
3088 /* Fixup sound interrupts property */
3089 node = call_prom("finddevice", 1, 1, ADDR("/builtin/sound"));
3090 if (PHANDLE_VALID(node)) {
3091 rv = prom_getprop(node, "interrupts", prop, sizeof(prop));
3092 if (rv == PROM_ERROR) {
3093 prom_printf("Adding sound interrupts property\n");
3094 prom_setprop(node, "/builtin/sound", "interrupts",
3095 sound_irq, sizeof(sound_irq));
3096 }
3097 }
3098
3099 /* Make sure ethernet phy-handle property exists */
3100 fixup_device_tree_efika_add_phy();
3101}
3102#else
3103#define fixup_device_tree_efika()
3104#endif
3105
3106#ifdef CONFIG_PPC_PASEMI_NEMO
3107/*
3108 * CFE supplied on Nemo is broken in several ways, biggest
3109 * problem is that it reassigns ISA interrupts to unused mpic ints.
3110 * Add an interrupt-controller property for the io-bridge to use
3111 * and correct the ints so we can attach them to an irq_domain
3112 */
3113static void __init fixup_device_tree_pasemi(void)
3114{
3115 u32 interrupts[2], parent, rval, val = 0;
3116 char *name, *pci_name;
3117 phandle iob, node;
3118
3119 /* Find the root pci node */
3120 name = "/pxp@0,e0000000";
3121 iob = call_prom("finddevice", 1, 1, ADDR(name));
3122 if (!PHANDLE_VALID(iob))
3123 return;
3124
3125 /* check if interrupt-controller node set yet */
3126 if (prom_getproplen(iob, "interrupt-controller") !=PROM_ERROR)
3127 return;
3128
3129 prom_printf("adding interrupt-controller property for SB600...\n");
3130
3131 prom_setprop(iob, name, "interrupt-controller", &val, 0);
3132
3133 pci_name = "/pxp@0,e0000000/pci@11";
3134 node = call_prom("finddevice", 1, 1, ADDR(pci_name));
3135 parent = ADDR(iob);
3136
3137 for( ; prom_next_node(&node); ) {
3138 /* scan each node for one with an interrupt */
3139 if (!PHANDLE_VALID(node))
3140 continue;
3141
3142 rval = prom_getproplen(node, "interrupts");
3143 if (rval == 0 || rval == PROM_ERROR)
3144 continue;
3145
3146 prom_getprop(node, "interrupts", &interrupts, sizeof(interrupts));
3147 if ((interrupts[0] < 212) || (interrupts[0] > 222))
3148 continue;
3149
3150 /* found a node, update both interrupts and interrupt-parent */
3151 if ((interrupts[0] >= 212) && (interrupts[0] <= 215))
3152 interrupts[0] -= 203;
3153 if ((interrupts[0] >= 216) && (interrupts[0] <= 220))
3154 interrupts[0] -= 213;
3155 if (interrupts[0] == 221)
3156 interrupts[0] = 14;
3157 if (interrupts[0] == 222)
3158 interrupts[0] = 8;
3159
3160 prom_setprop(node, pci_name, "interrupts", interrupts,
3161 sizeof(interrupts));
3162 prom_setprop(node, pci_name, "interrupt-parent", &parent,
3163 sizeof(parent));
3164 }
3165
3166 /*
3167 * The io-bridge has device_type set to 'io-bridge' change it to 'isa'
3168 * so that generic isa-bridge code can add the SB600 and its on-board
3169 * peripherals.
3170 */
3171 name = "/pxp@0,e0000000/io-bridge@0";
3172 iob = call_prom("finddevice", 1, 1, ADDR(name));
3173 if (!PHANDLE_VALID(iob))
3174 return;
3175
3176 /* device_type is already set, just change it. */
3177
3178 prom_printf("Changing device_type of SB600 node...\n");
3179
3180 prom_setprop(iob, name, "device_type", "isa", sizeof("isa"));
3181}
3182#else /* !CONFIG_PPC_PASEMI_NEMO */
3183static inline void fixup_device_tree_pasemi(void) { }
3184#endif
3185
3186static void __init fixup_device_tree(void)
3187{
3188 fixup_device_tree_maple();
3189 fixup_device_tree_maple_memory_controller();
3190 fixup_device_tree_chrp();
3191 fixup_device_tree_pmac();
3192 fixup_device_tree_efika();
3193 fixup_device_tree_pasemi();
3194}
3195
3196static void __init prom_find_boot_cpu(void)
3197{
3198 __be32 rval;
3199 ihandle prom_cpu;
3200 phandle cpu_pkg;
3201
3202 rval = 0;
3203 if (prom_getprop(prom.chosen, "cpu", &rval, sizeof(rval)) <= 0)
3204 return;
3205 prom_cpu = be32_to_cpu(rval);
3206
3207 cpu_pkg = call_prom("instance-to-package", 1, 1, prom_cpu);
3208
3209 if (!PHANDLE_VALID(cpu_pkg))
3210 return;
3211
3212 prom_getprop(cpu_pkg, "reg", &rval, sizeof(rval));
3213 prom.cpu = be32_to_cpu(rval);
3214
3215 prom_debug("Booting CPU hw index = %d\n", prom.cpu);
3216}
3217
3218static void __init prom_check_initrd(unsigned long r3, unsigned long r4)
3219{
3220#ifdef CONFIG_BLK_DEV_INITRD
3221 if (r3 && r4 && r4 != 0xdeadbeef) {
3222 __be64 val;
3223
3224 prom_initrd_start = is_kernel_addr(r3) ? __pa(r3) : r3;
3225 prom_initrd_end = prom_initrd_start + r4;
3226
3227 val = cpu_to_be64(prom_initrd_start);
3228 prom_setprop(prom.chosen, "/chosen", "linux,initrd-start",
3229 &val, sizeof(val));
3230 val = cpu_to_be64(prom_initrd_end);
3231 prom_setprop(prom.chosen, "/chosen", "linux,initrd-end",
3232 &val, sizeof(val));
3233
3234 reserve_mem(prom_initrd_start,
3235 prom_initrd_end - prom_initrd_start);
3236
3237 prom_debug("initrd_start=0x%lx\n", prom_initrd_start);
3238 prom_debug("initrd_end=0x%lx\n", prom_initrd_end);
3239 }
3240#endif /* CONFIG_BLK_DEV_INITRD */
3241}
3242
3243#ifdef CONFIG_PPC_SVM
3244/*
3245 * Perform the Enter Secure Mode ultracall.
3246 */
3247static int __init enter_secure_mode(unsigned long kbase, unsigned long fdt)
3248{
3249 register unsigned long r3 asm("r3") = UV_ESM;
3250 register unsigned long r4 asm("r4") = kbase;
3251 register unsigned long r5 asm("r5") = fdt;
3252
3253 asm volatile("sc 2" : "+r"(r3) : "r"(r4), "r"(r5));
3254
3255 return r3;
3256}
3257
3258/*
3259 * Call the Ultravisor to transfer us to secure memory if we have an ESM blob.
3260 */
3261static void __init setup_secure_guest(unsigned long kbase, unsigned long fdt)
3262{
3263 int ret;
3264
3265 if (!prom_svm_enable)
3266 return;
3267
3268 /* Switch to secure mode. */
3269 prom_printf("Switching to secure mode.\n");
3270
3271 /*
3272 * The ultravisor will do an integrity check of the kernel image but we
3273 * relocated it so the check will fail. Restore the original image by
3274 * relocating it back to the kernel virtual base address.
3275 */
3276 relocate(KERNELBASE);
3277
3278 ret = enter_secure_mode(kbase, fdt);
3279
3280 /* Relocate the kernel again. */
3281 relocate(kbase);
3282
3283 if (ret != U_SUCCESS) {
3284 prom_printf("Returned %d from switching to secure mode.\n", ret);
3285 prom_rtas_os_term("Switch to secure mode failed.\n");
3286 }
3287}
3288#else
3289static void __init setup_secure_guest(unsigned long kbase, unsigned long fdt)
3290{
3291}
3292#endif /* CONFIG_PPC_SVM */
3293
3294/*
3295 * We enter here early on, when the Open Firmware prom is still
3296 * handling exceptions and the MMU hash table for us.
3297 */
3298
3299unsigned long __init prom_init(unsigned long r3, unsigned long r4,
3300 unsigned long pp,
3301 unsigned long r6, unsigned long r7,
3302 unsigned long kbase)
3303{
3304 unsigned long hdr;
3305
3306#ifdef CONFIG_PPC32
3307 unsigned long offset = reloc_offset();
3308 reloc_got2(offset);
3309#endif
3310
3311 /*
3312 * First zero the BSS
3313 */
3314 memset(&__bss_start, 0, __bss_stop - __bss_start);
3315
3316 /*
3317 * Init interface to Open Firmware, get some node references,
3318 * like /chosen
3319 */
3320 prom_init_client_services(pp);
3321
3322 /*
3323 * See if this OF is old enough that we need to do explicit maps
3324 * and other workarounds
3325 */
3326 prom_find_mmu();
3327
3328 /*
3329 * Init prom stdout device
3330 */
3331 prom_init_stdout();
3332
3333 prom_printf("Preparing to boot %s", linux_banner);
3334
3335 /*
3336 * Get default machine type. At this point, we do not differentiate
3337 * between pSeries SMP and pSeries LPAR
3338 */
3339 of_platform = prom_find_machine_type();
3340 prom_printf("Detected machine type: %x\n", of_platform);
3341
3342#ifndef CONFIG_NONSTATIC_KERNEL
3343 /* Bail if this is a kdump kernel. */
3344 if (PHYSICAL_START > 0)
3345 prom_panic("Error: You can't boot a kdump kernel from OF!\n");
3346#endif
3347
3348 /*
3349 * Check for an initrd
3350 */
3351 prom_check_initrd(r3, r4);
3352
3353 /*
3354 * Do early parsing of command line
3355 */
3356 early_cmdline_parse();
3357
3358#ifdef CONFIG_PPC_PSERIES
3359 /*
3360 * On pSeries, inform the firmware about our capabilities
3361 */
3362 if (of_platform == PLATFORM_PSERIES ||
3363 of_platform == PLATFORM_PSERIES_LPAR)
3364 prom_send_capabilities();
3365#endif
3366
3367 /*
3368 * Copy the CPU hold code
3369 */
3370 if (of_platform != PLATFORM_POWERMAC)
3371 copy_and_flush(0, kbase, 0x100, 0);
3372
3373 /*
3374 * Initialize memory management within prom_init
3375 */
3376 prom_init_mem();
3377
3378 /*
3379 * Determine which cpu is actually running right _now_
3380 */
3381 prom_find_boot_cpu();
3382
3383 /*
3384 * Initialize display devices
3385 */
3386 prom_check_displays();
3387
3388#if defined(CONFIG_PPC64) && defined(__BIG_ENDIAN__)
3389 /*
3390 * Initialize IOMMU (TCE tables) on pSeries. Do that before anything else
3391 * that uses the allocator, we need to make sure we get the top of memory
3392 * available for us here...
3393 */
3394 if (of_platform == PLATFORM_PSERIES)
3395 prom_initialize_tce_table();
3396#endif
3397
3398 /*
3399 * On non-powermacs, try to instantiate RTAS. PowerMacs don't
3400 * have a usable RTAS implementation.
3401 */
3402 if (of_platform != PLATFORM_POWERMAC)
3403 prom_instantiate_rtas();
3404
3405#ifdef CONFIG_PPC64
3406 /* instantiate sml */
3407 prom_instantiate_sml();
3408#endif
3409
3410 /*
3411 * On non-powermacs, put all CPUs in spin-loops.
3412 *
3413 * PowerMacs use a different mechanism to spin CPUs
3414 *
3415 * (This must be done after instantiating RTAS)
3416 */
3417 if (of_platform != PLATFORM_POWERMAC)
3418 prom_hold_cpus();
3419
3420 /*
3421 * Fill in some infos for use by the kernel later on
3422 */
3423 if (prom_memory_limit) {
3424 __be64 val = cpu_to_be64(prom_memory_limit);
3425 prom_setprop(prom.chosen, "/chosen", "linux,memory-limit",
3426 &val, sizeof(val));
3427 }
3428#ifdef CONFIG_PPC64
3429 if (prom_iommu_off)
3430 prom_setprop(prom.chosen, "/chosen", "linux,iommu-off",
3431 NULL, 0);
3432
3433 if (prom_iommu_force_on)
3434 prom_setprop(prom.chosen, "/chosen", "linux,iommu-force-on",
3435 NULL, 0);
3436
3437 if (prom_tce_alloc_start) {
3438 prom_setprop(prom.chosen, "/chosen", "linux,tce-alloc-start",
3439 &prom_tce_alloc_start,
3440 sizeof(prom_tce_alloc_start));
3441 prom_setprop(prom.chosen, "/chosen", "linux,tce-alloc-end",
3442 &prom_tce_alloc_end,
3443 sizeof(prom_tce_alloc_end));
3444 }
3445#endif
3446
3447 /*
3448 * Fixup any known bugs in the device-tree
3449 */
3450 fixup_device_tree();
3451
3452 /*
3453 * Now finally create the flattened device-tree
3454 */
3455 prom_printf("copying OF device tree...\n");
3456 flatten_device_tree();
3457
3458 /*
3459 * in case stdin is USB and still active on IBM machines...
3460 * Unfortunately quiesce crashes on some powermacs if we have
3461 * closed stdin already (in particular the powerbook 101).
3462 */
3463 if (of_platform != PLATFORM_POWERMAC)
3464 prom_close_stdin();
3465
3466 /*
3467 * Call OF "quiesce" method to shut down pending DMA's from
3468 * devices etc...
3469 */
3470 prom_printf("Quiescing Open Firmware ...\n");
3471 call_prom("quiesce", 0, 0);
3472
3473 /*
3474 * And finally, call the kernel passing it the flattened device
3475 * tree and NULL as r5, thus triggering the new entry point which
3476 * is common to us and kexec
3477 */
3478 hdr = dt_header_start;
3479
3480 prom_printf("Booting Linux via __start() @ 0x%lx ...\n", kbase);
3481 prom_debug("->dt_header_start=0x%lx\n", hdr);
3482
3483#ifdef CONFIG_PPC32
3484 reloc_got2(-offset);
3485#endif
3486
3487 /* Move to secure memory if we're supposed to be secure guests. */
3488 setup_secure_guest(kbase, hdr);
3489
3490 __start(hdr, kbase, 0, 0, 0, 0, 0);
3491
3492 return 0;
3493}
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}