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1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 1995 Linus Torvalds
7 * Copyright (C) 1995 Waldorf Electronics
8 * Copyright (C) 1994, 95, 96, 97, 98, 99, 2000, 01, 02, 03 Ralf Baechle
9 * Copyright (C) 1996 Stoned Elipot
10 * Copyright (C) 1999 Silicon Graphics, Inc.
11 * Copyright (C) 2000, 2001, 2002, 2007 Maciej W. Rozycki
12 */
13#include <linux/init.h>
14#include <linux/ioport.h>
15#include <linux/export.h>
16#include <linux/screen_info.h>
17#include <linux/memblock.h>
18#include <linux/bootmem.h>
19#include <linux/initrd.h>
20#include <linux/root_dev.h>
21#include <linux/highmem.h>
22#include <linux/console.h>
23#include <linux/pfn.h>
24#include <linux/debugfs.h>
25#include <linux/kexec.h>
26#include <linux/sizes.h>
27#include <linux/device.h>
28#include <linux/dma-contiguous.h>
29#include <linux/decompress/generic.h>
30
31#include <asm/addrspace.h>
32#include <asm/bootinfo.h>
33#include <asm/bugs.h>
34#include <asm/cache.h>
35#include <asm/cdmm.h>
36#include <asm/cpu.h>
37#include <asm/debug.h>
38#include <asm/sections.h>
39#include <asm/setup.h>
40#include <asm/smp-ops.h>
41#include <asm/prom.h>
42
43#ifdef CONFIG_MIPS_ELF_APPENDED_DTB
44const char __section(.appended_dtb) __appended_dtb[0x100000];
45#endif /* CONFIG_MIPS_ELF_APPENDED_DTB */
46
47struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;
48
49EXPORT_SYMBOL(cpu_data);
50
51#ifdef CONFIG_VT
52struct screen_info screen_info;
53#endif
54
55/*
56 * Setup information
57 *
58 * These are initialized so they are in the .data section
59 */
60unsigned long mips_machtype __read_mostly = MACH_UNKNOWN;
61
62EXPORT_SYMBOL(mips_machtype);
63
64struct boot_mem_map boot_mem_map;
65
66static char __initdata command_line[COMMAND_LINE_SIZE];
67char __initdata arcs_cmdline[COMMAND_LINE_SIZE];
68
69#ifdef CONFIG_CMDLINE_BOOL
70static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
71#endif
72
73/*
74 * mips_io_port_base is the begin of the address space to which x86 style
75 * I/O ports are mapped.
76 */
77const unsigned long mips_io_port_base = -1;
78EXPORT_SYMBOL(mips_io_port_base);
79
80static struct resource code_resource = { .name = "Kernel code", };
81static struct resource data_resource = { .name = "Kernel data", };
82
83static void *detect_magic __initdata = detect_memory_region;
84
85void __init add_memory_region(phys_addr_t start, phys_addr_t size, long type)
86{
87 int x = boot_mem_map.nr_map;
88 int i;
89
90 /*
91 * If the region reaches the top of the physical address space, adjust
92 * the size slightly so that (start + size) doesn't overflow
93 */
94 if (start + size - 1 == (phys_addr_t)ULLONG_MAX)
95 --size;
96
97 /* Sanity check */
98 if (start + size < start) {
99 pr_warn("Trying to add an invalid memory region, skipped\n");
100 return;
101 }
102
103 /*
104 * Try to merge with existing entry, if any.
105 */
106 for (i = 0; i < boot_mem_map.nr_map; i++) {
107 struct boot_mem_map_entry *entry = boot_mem_map.map + i;
108 unsigned long top;
109
110 if (entry->type != type)
111 continue;
112
113 if (start + size < entry->addr)
114 continue; /* no overlap */
115
116 if (entry->addr + entry->size < start)
117 continue; /* no overlap */
118
119 top = max(entry->addr + entry->size, start + size);
120 entry->addr = min(entry->addr, start);
121 entry->size = top - entry->addr;
122
123 return;
124 }
125
126 if (boot_mem_map.nr_map == BOOT_MEM_MAP_MAX) {
127 pr_err("Ooops! Too many entries in the memory map!\n");
128 return;
129 }
130
131 boot_mem_map.map[x].addr = start;
132 boot_mem_map.map[x].size = size;
133 boot_mem_map.map[x].type = type;
134 boot_mem_map.nr_map++;
135}
136
137void __init detect_memory_region(phys_addr_t start, phys_addr_t sz_min, phys_addr_t sz_max)
138{
139 void *dm = &detect_magic;
140 phys_addr_t size;
141
142 for (size = sz_min; size < sz_max; size <<= 1) {
143 if (!memcmp(dm, dm + size, sizeof(detect_magic)))
144 break;
145 }
146
147 pr_debug("Memory: %lluMB of RAM detected at 0x%llx (min: %lluMB, max: %lluMB)\n",
148 ((unsigned long long) size) / SZ_1M,
149 (unsigned long long) start,
150 ((unsigned long long) sz_min) / SZ_1M,
151 ((unsigned long long) sz_max) / SZ_1M);
152
153 add_memory_region(start, size, BOOT_MEM_RAM);
154}
155
156static void __init print_memory_map(void)
157{
158 int i;
159 const int field = 2 * sizeof(unsigned long);
160
161 for (i = 0; i < boot_mem_map.nr_map; i++) {
162 printk(KERN_INFO " memory: %0*Lx @ %0*Lx ",
163 field, (unsigned long long) boot_mem_map.map[i].size,
164 field, (unsigned long long) boot_mem_map.map[i].addr);
165
166 switch (boot_mem_map.map[i].type) {
167 case BOOT_MEM_RAM:
168 printk(KERN_CONT "(usable)\n");
169 break;
170 case BOOT_MEM_INIT_RAM:
171 printk(KERN_CONT "(usable after init)\n");
172 break;
173 case BOOT_MEM_ROM_DATA:
174 printk(KERN_CONT "(ROM data)\n");
175 break;
176 case BOOT_MEM_RESERVED:
177 printk(KERN_CONT "(reserved)\n");
178 break;
179 default:
180 printk(KERN_CONT "type %lu\n", boot_mem_map.map[i].type);
181 break;
182 }
183 }
184}
185
186/*
187 * Manage initrd
188 */
189#ifdef CONFIG_BLK_DEV_INITRD
190
191static int __init rd_start_early(char *p)
192{
193 unsigned long start = memparse(p, &p);
194
195#ifdef CONFIG_64BIT
196 /* Guess if the sign extension was forgotten by bootloader */
197 if (start < XKPHYS)
198 start = (int)start;
199#endif
200 initrd_start = start;
201 initrd_end += start;
202 return 0;
203}
204early_param("rd_start", rd_start_early);
205
206static int __init rd_size_early(char *p)
207{
208 initrd_end += memparse(p, &p);
209 return 0;
210}
211early_param("rd_size", rd_size_early);
212
213/* it returns the next free pfn after initrd */
214static unsigned long __init init_initrd(void)
215{
216 unsigned long end;
217
218 /*
219 * Board specific code or command line parser should have
220 * already set up initrd_start and initrd_end. In these cases
221 * perfom sanity checks and use them if all looks good.
222 */
223 if (!initrd_start || initrd_end <= initrd_start)
224 goto disable;
225
226 if (initrd_start & ~PAGE_MASK) {
227 pr_err("initrd start must be page aligned\n");
228 goto disable;
229 }
230 if (initrd_start < PAGE_OFFSET) {
231 pr_err("initrd start < PAGE_OFFSET\n");
232 goto disable;
233 }
234
235 /*
236 * Sanitize initrd addresses. For example firmware
237 * can't guess if they need to pass them through
238 * 64-bits values if the kernel has been built in pure
239 * 32-bit. We need also to switch from KSEG0 to XKPHYS
240 * addresses now, so the code can now safely use __pa().
241 */
242 end = __pa(initrd_end);
243 initrd_end = (unsigned long)__va(end);
244 initrd_start = (unsigned long)__va(__pa(initrd_start));
245
246 ROOT_DEV = Root_RAM0;
247 return PFN_UP(end);
248disable:
249 initrd_start = 0;
250 initrd_end = 0;
251 return 0;
252}
253
254/* In some conditions (e.g. big endian bootloader with a little endian
255 kernel), the initrd might appear byte swapped. Try to detect this and
256 byte swap it if needed. */
257static void __init maybe_bswap_initrd(void)
258{
259#if defined(CONFIG_CPU_CAVIUM_OCTEON)
260 u64 buf;
261
262 /* Check for CPIO signature */
263 if (!memcmp((void *)initrd_start, "070701", 6))
264 return;
265
266 /* Check for compressed initrd */
267 if (decompress_method((unsigned char *)initrd_start, 8, NULL))
268 return;
269
270 /* Try again with a byte swapped header */
271 buf = swab64p((u64 *)initrd_start);
272 if (!memcmp(&buf, "070701", 6) ||
273 decompress_method((unsigned char *)(&buf), 8, NULL)) {
274 unsigned long i;
275
276 pr_info("Byteswapped initrd detected\n");
277 for (i = initrd_start; i < ALIGN(initrd_end, 8); i += 8)
278 swab64s((u64 *)i);
279 }
280#endif
281}
282
283static void __init finalize_initrd(void)
284{
285 unsigned long size = initrd_end - initrd_start;
286
287 if (size == 0) {
288 printk(KERN_INFO "Initrd not found or empty");
289 goto disable;
290 }
291 if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
292 printk(KERN_ERR "Initrd extends beyond end of memory");
293 goto disable;
294 }
295
296 maybe_bswap_initrd();
297
298 reserve_bootmem(__pa(initrd_start), size, BOOTMEM_DEFAULT);
299 initrd_below_start_ok = 1;
300
301 pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",
302 initrd_start, size);
303 return;
304disable:
305 printk(KERN_CONT " - disabling initrd\n");
306 initrd_start = 0;
307 initrd_end = 0;
308}
309
310#else /* !CONFIG_BLK_DEV_INITRD */
311
312static unsigned long __init init_initrd(void)
313{
314 return 0;
315}
316
317#define finalize_initrd() do {} while (0)
318
319#endif
320
321/*
322 * Initialize the bootmem allocator. It also setup initrd related data
323 * if needed.
324 */
325#if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON3) && defined(CONFIG_NUMA))
326
327static void __init bootmem_init(void)
328{
329 init_initrd();
330 finalize_initrd();
331}
332
333#else /* !CONFIG_SGI_IP27 */
334
335static void __init bootmem_init(void)
336{
337 unsigned long reserved_end;
338 unsigned long mapstart = ~0UL;
339 unsigned long bootmap_size;
340 int i;
341
342 /*
343 * Sanity check any INITRD first. We don't take it into account
344 * for bootmem setup initially, rely on the end-of-kernel-code
345 * as our memory range starting point. Once bootmem is inited we
346 * will reserve the area used for the initrd.
347 */
348 init_initrd();
349 reserved_end = (unsigned long) PFN_UP(__pa_symbol(&_end));
350
351 /*
352 * max_low_pfn is not a number of pages. The number of pages
353 * of the system is given by 'max_low_pfn - min_low_pfn'.
354 */
355 min_low_pfn = ~0UL;
356 max_low_pfn = 0;
357
358 /*
359 * Find the highest page frame number we have available.
360 */
361 for (i = 0; i < boot_mem_map.nr_map; i++) {
362 unsigned long start, end;
363
364 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
365 continue;
366
367 start = PFN_UP(boot_mem_map.map[i].addr);
368 end = PFN_DOWN(boot_mem_map.map[i].addr
369 + boot_mem_map.map[i].size);
370
371#ifndef CONFIG_HIGHMEM
372 /*
373 * Skip highmem here so we get an accurate max_low_pfn if low
374 * memory stops short of high memory.
375 * If the region overlaps HIGHMEM_START, end is clipped so
376 * max_pfn excludes the highmem portion.
377 */
378 if (start >= PFN_DOWN(HIGHMEM_START))
379 continue;
380 if (end > PFN_DOWN(HIGHMEM_START))
381 end = PFN_DOWN(HIGHMEM_START);
382#endif
383
384 if (end > max_low_pfn)
385 max_low_pfn = end;
386 if (start < min_low_pfn)
387 min_low_pfn = start;
388 if (end <= reserved_end)
389 continue;
390#ifdef CONFIG_BLK_DEV_INITRD
391 /* Skip zones before initrd and initrd itself */
392 if (initrd_end && end <= (unsigned long)PFN_UP(__pa(initrd_end)))
393 continue;
394#endif
395 if (start >= mapstart)
396 continue;
397 mapstart = max(reserved_end, start);
398 }
399
400 if (min_low_pfn >= max_low_pfn)
401 panic("Incorrect memory mapping !!!");
402 if (min_low_pfn > ARCH_PFN_OFFSET) {
403 pr_info("Wasting %lu bytes for tracking %lu unused pages\n",
404 (min_low_pfn - ARCH_PFN_OFFSET) * sizeof(struct page),
405 min_low_pfn - ARCH_PFN_OFFSET);
406 } else if (min_low_pfn < ARCH_PFN_OFFSET) {
407 pr_info("%lu free pages won't be used\n",
408 ARCH_PFN_OFFSET - min_low_pfn);
409 }
410 min_low_pfn = ARCH_PFN_OFFSET;
411
412 /*
413 * Determine low and high memory ranges
414 */
415 max_pfn = max_low_pfn;
416 if (max_low_pfn > PFN_DOWN(HIGHMEM_START)) {
417#ifdef CONFIG_HIGHMEM
418 highstart_pfn = PFN_DOWN(HIGHMEM_START);
419 highend_pfn = max_low_pfn;
420#endif
421 max_low_pfn = PFN_DOWN(HIGHMEM_START);
422 }
423
424#ifdef CONFIG_BLK_DEV_INITRD
425 /*
426 * mapstart should be after initrd_end
427 */
428 if (initrd_end)
429 mapstart = max(mapstart, (unsigned long)PFN_UP(__pa(initrd_end)));
430#endif
431
432 /*
433 * Initialize the boot-time allocator with low memory only.
434 */
435 bootmap_size = init_bootmem_node(NODE_DATA(0), mapstart,
436 min_low_pfn, max_low_pfn);
437
438
439 for (i = 0; i < boot_mem_map.nr_map; i++) {
440 unsigned long start, end;
441
442 start = PFN_UP(boot_mem_map.map[i].addr);
443 end = PFN_DOWN(boot_mem_map.map[i].addr
444 + boot_mem_map.map[i].size);
445
446 if (start <= min_low_pfn)
447 start = min_low_pfn;
448 if (start >= end)
449 continue;
450
451#ifndef CONFIG_HIGHMEM
452 if (end > max_low_pfn)
453 end = max_low_pfn;
454
455 /*
456 * ... finally, is the area going away?
457 */
458 if (end <= start)
459 continue;
460#endif
461
462 memblock_add_node(PFN_PHYS(start), PFN_PHYS(end - start), 0);
463 }
464
465 /*
466 * Register fully available low RAM pages with the bootmem allocator.
467 */
468 for (i = 0; i < boot_mem_map.nr_map; i++) {
469 unsigned long start, end, size;
470
471 start = PFN_UP(boot_mem_map.map[i].addr);
472 end = PFN_DOWN(boot_mem_map.map[i].addr
473 + boot_mem_map.map[i].size);
474
475 /*
476 * Reserve usable memory.
477 */
478 switch (boot_mem_map.map[i].type) {
479 case BOOT_MEM_RAM:
480 break;
481 case BOOT_MEM_INIT_RAM:
482 memory_present(0, start, end);
483 continue;
484 default:
485 /* Not usable memory */
486 continue;
487 }
488
489 /*
490 * We are rounding up the start address of usable memory
491 * and at the end of the usable range downwards.
492 */
493 if (start >= max_low_pfn)
494 continue;
495 if (start < reserved_end)
496 start = reserved_end;
497 if (end > max_low_pfn)
498 end = max_low_pfn;
499
500 /*
501 * ... finally, is the area going away?
502 */
503 if (end <= start)
504 continue;
505 size = end - start;
506
507 /* Register lowmem ranges */
508 free_bootmem(PFN_PHYS(start), size << PAGE_SHIFT);
509 memory_present(0, start, end);
510 }
511
512 /*
513 * Reserve the bootmap memory.
514 */
515 reserve_bootmem(PFN_PHYS(mapstart), bootmap_size, BOOTMEM_DEFAULT);
516
517#ifdef CONFIG_RELOCATABLE
518 /*
519 * The kernel reserves all memory below its _end symbol as bootmem,
520 * but the kernel may now be at a much higher address. The memory
521 * between the original and new locations may be returned to the system.
522 */
523 if (__pa_symbol(_text) > __pa_symbol(VMLINUX_LOAD_ADDRESS)) {
524 unsigned long offset;
525 extern void show_kernel_relocation(const char *level);
526
527 offset = __pa_symbol(_text) - __pa_symbol(VMLINUX_LOAD_ADDRESS);
528 free_bootmem(__pa_symbol(VMLINUX_LOAD_ADDRESS), offset);
529
530#if defined(CONFIG_DEBUG_KERNEL) && defined(CONFIG_DEBUG_INFO)
531 /*
532 * This information is necessary when debugging the kernel
533 * But is a security vulnerability otherwise!
534 */
535 show_kernel_relocation(KERN_INFO);
536#endif
537 }
538#endif
539
540 /*
541 * Reserve initrd memory if needed.
542 */
543 finalize_initrd();
544}
545
546#endif /* CONFIG_SGI_IP27 */
547
548/*
549 * arch_mem_init - initialize memory management subsystem
550 *
551 * o plat_mem_setup() detects the memory configuration and will record detected
552 * memory areas using add_memory_region.
553 *
554 * At this stage the memory configuration of the system is known to the
555 * kernel but generic memory management system is still entirely uninitialized.
556 *
557 * o bootmem_init()
558 * o sparse_init()
559 * o paging_init()
560 * o dma_contiguous_reserve()
561 *
562 * At this stage the bootmem allocator is ready to use.
563 *
564 * NOTE: historically plat_mem_setup did the entire platform initialization.
565 * This was rather impractical because it meant plat_mem_setup had to
566 * get away without any kind of memory allocator. To keep old code from
567 * breaking plat_setup was just renamed to plat_mem_setup and a second platform
568 * initialization hook for anything else was introduced.
569 */
570
571static int usermem __initdata;
572
573static int __init early_parse_mem(char *p)
574{
575 phys_addr_t start, size;
576
577 /*
578 * If a user specifies memory size, we
579 * blow away any automatically generated
580 * size.
581 */
582 if (usermem == 0) {
583 boot_mem_map.nr_map = 0;
584 usermem = 1;
585 }
586 start = 0;
587 size = memparse(p, &p);
588 if (*p == '@')
589 start = memparse(p + 1, &p);
590
591 add_memory_region(start, size, BOOT_MEM_RAM);
592 return 0;
593}
594early_param("mem", early_parse_mem);
595
596#ifdef CONFIG_PROC_VMCORE
597unsigned long setup_elfcorehdr, setup_elfcorehdr_size;
598static int __init early_parse_elfcorehdr(char *p)
599{
600 int i;
601
602 setup_elfcorehdr = memparse(p, &p);
603
604 for (i = 0; i < boot_mem_map.nr_map; i++) {
605 unsigned long start = boot_mem_map.map[i].addr;
606 unsigned long end = (boot_mem_map.map[i].addr +
607 boot_mem_map.map[i].size);
608 if (setup_elfcorehdr >= start && setup_elfcorehdr < end) {
609 /*
610 * Reserve from the elf core header to the end of
611 * the memory segment, that should all be kdump
612 * reserved memory.
613 */
614 setup_elfcorehdr_size = end - setup_elfcorehdr;
615 break;
616 }
617 }
618 /*
619 * If we don't find it in the memory map, then we shouldn't
620 * have to worry about it, as the new kernel won't use it.
621 */
622 return 0;
623}
624early_param("elfcorehdr", early_parse_elfcorehdr);
625#endif
626
627static void __init arch_mem_addpart(phys_addr_t mem, phys_addr_t end, int type)
628{
629 phys_addr_t size;
630 int i;
631
632 size = end - mem;
633 if (!size)
634 return;
635
636 /* Make sure it is in the boot_mem_map */
637 for (i = 0; i < boot_mem_map.nr_map; i++) {
638 if (mem >= boot_mem_map.map[i].addr &&
639 mem < (boot_mem_map.map[i].addr +
640 boot_mem_map.map[i].size))
641 return;
642 }
643 add_memory_region(mem, size, type);
644}
645
646#ifdef CONFIG_KEXEC
647static inline unsigned long long get_total_mem(void)
648{
649 unsigned long long total;
650
651 total = max_pfn - min_low_pfn;
652 return total << PAGE_SHIFT;
653}
654
655static void __init mips_parse_crashkernel(void)
656{
657 unsigned long long total_mem;
658 unsigned long long crash_size, crash_base;
659 int ret;
660
661 total_mem = get_total_mem();
662 ret = parse_crashkernel(boot_command_line, total_mem,
663 &crash_size, &crash_base);
664 if (ret != 0 || crash_size <= 0)
665 return;
666
667 crashk_res.start = crash_base;
668 crashk_res.end = crash_base + crash_size - 1;
669}
670
671static void __init request_crashkernel(struct resource *res)
672{
673 int ret;
674
675 ret = request_resource(res, &crashk_res);
676 if (!ret)
677 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",
678 (unsigned long)((crashk_res.end -
679 crashk_res.start + 1) >> 20),
680 (unsigned long)(crashk_res.start >> 20));
681}
682#else /* !defined(CONFIG_KEXEC) */
683static void __init mips_parse_crashkernel(void)
684{
685}
686
687static void __init request_crashkernel(struct resource *res)
688{
689}
690#endif /* !defined(CONFIG_KEXEC) */
691
692#define USE_PROM_CMDLINE IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_BOOTLOADER)
693#define USE_DTB_CMDLINE IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_DTB)
694#define EXTEND_WITH_PROM IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND)
695#define BUILTIN_EXTEND_WITH_PROM \
696 IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND)
697
698static void __init arch_mem_init(char **cmdline_p)
699{
700 struct memblock_region *reg;
701 extern void plat_mem_setup(void);
702
703 /* call board setup routine */
704 plat_mem_setup();
705
706 /*
707 * Make sure all kernel memory is in the maps. The "UP" and
708 * "DOWN" are opposite for initdata since if it crosses over
709 * into another memory section you don't want that to be
710 * freed when the initdata is freed.
711 */
712 arch_mem_addpart(PFN_DOWN(__pa_symbol(&_text)) << PAGE_SHIFT,
713 PFN_UP(__pa_symbol(&_edata)) << PAGE_SHIFT,
714 BOOT_MEM_RAM);
715 arch_mem_addpart(PFN_UP(__pa_symbol(&__init_begin)) << PAGE_SHIFT,
716 PFN_DOWN(__pa_symbol(&__init_end)) << PAGE_SHIFT,
717 BOOT_MEM_INIT_RAM);
718
719 pr_info("Determined physical RAM map:\n");
720 print_memory_map();
721
722#if defined(CONFIG_CMDLINE_BOOL) && defined(CONFIG_CMDLINE_OVERRIDE)
723 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
724#else
725 if ((USE_PROM_CMDLINE && arcs_cmdline[0]) ||
726 (USE_DTB_CMDLINE && !boot_command_line[0]))
727 strlcpy(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
728
729 if (EXTEND_WITH_PROM && arcs_cmdline[0]) {
730 if (boot_command_line[0])
731 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
732 strlcat(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
733 }
734
735#if defined(CONFIG_CMDLINE_BOOL)
736 if (builtin_cmdline[0]) {
737 if (boot_command_line[0])
738 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
739 strlcat(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
740 }
741
742 if (BUILTIN_EXTEND_WITH_PROM && arcs_cmdline[0]) {
743 if (boot_command_line[0])
744 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
745 strlcat(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
746 }
747#endif
748#endif
749 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
750
751 *cmdline_p = command_line;
752
753 parse_early_param();
754
755 if (usermem) {
756 pr_info("User-defined physical RAM map:\n");
757 print_memory_map();
758 }
759
760 bootmem_init();
761#ifdef CONFIG_PROC_VMCORE
762 if (setup_elfcorehdr && setup_elfcorehdr_size) {
763 printk(KERN_INFO "kdump reserved memory at %lx-%lx\n",
764 setup_elfcorehdr, setup_elfcorehdr_size);
765 reserve_bootmem(setup_elfcorehdr, setup_elfcorehdr_size,
766 BOOTMEM_DEFAULT);
767 }
768#endif
769
770 mips_parse_crashkernel();
771#ifdef CONFIG_KEXEC
772 if (crashk_res.start != crashk_res.end)
773 reserve_bootmem(crashk_res.start,
774 crashk_res.end - crashk_res.start + 1,
775 BOOTMEM_DEFAULT);
776#endif
777 device_tree_init();
778 sparse_init();
779 plat_swiotlb_setup();
780
781 dma_contiguous_reserve(PFN_PHYS(max_low_pfn));
782 /* Tell bootmem about cma reserved memblock section */
783 for_each_memblock(reserved, reg)
784 if (reg->size != 0)
785 reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT);
786
787 reserve_bootmem_region(__pa_symbol(&__nosave_begin),
788 __pa_symbol(&__nosave_end)); /* Reserve for hibernation */
789}
790
791static void __init resource_init(void)
792{
793 int i;
794
795 if (UNCAC_BASE != IO_BASE)
796 return;
797
798 code_resource.start = __pa_symbol(&_text);
799 code_resource.end = __pa_symbol(&_etext) - 1;
800 data_resource.start = __pa_symbol(&_etext);
801 data_resource.end = __pa_symbol(&_edata) - 1;
802
803 for (i = 0; i < boot_mem_map.nr_map; i++) {
804 struct resource *res;
805 unsigned long start, end;
806
807 start = boot_mem_map.map[i].addr;
808 end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1;
809 if (start >= HIGHMEM_START)
810 continue;
811 if (end >= HIGHMEM_START)
812 end = HIGHMEM_START - 1;
813
814 res = alloc_bootmem(sizeof(struct resource));
815
816 res->start = start;
817 res->end = end;
818 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
819
820 switch (boot_mem_map.map[i].type) {
821 case BOOT_MEM_RAM:
822 case BOOT_MEM_INIT_RAM:
823 case BOOT_MEM_ROM_DATA:
824 res->name = "System RAM";
825 res->flags |= IORESOURCE_SYSRAM;
826 break;
827 case BOOT_MEM_RESERVED:
828 default:
829 res->name = "reserved";
830 }
831
832 request_resource(&iomem_resource, res);
833
834 /*
835 * We don't know which RAM region contains kernel data,
836 * so we try it repeatedly and let the resource manager
837 * test it.
838 */
839 request_resource(res, &code_resource);
840 request_resource(res, &data_resource);
841 request_crashkernel(res);
842 }
843}
844
845#ifdef CONFIG_SMP
846static void __init prefill_possible_map(void)
847{
848 int i, possible = num_possible_cpus();
849
850 if (possible > nr_cpu_ids)
851 possible = nr_cpu_ids;
852
853 for (i = 0; i < possible; i++)
854 set_cpu_possible(i, true);
855 for (; i < NR_CPUS; i++)
856 set_cpu_possible(i, false);
857
858 nr_cpu_ids = possible;
859}
860#else
861static inline void prefill_possible_map(void) {}
862#endif
863
864void __init setup_arch(char **cmdline_p)
865{
866 cpu_probe();
867 mips_cm_probe();
868 prom_init();
869
870 setup_early_fdc_console();
871#ifdef CONFIG_EARLY_PRINTK
872 setup_early_printk();
873#endif
874 cpu_report();
875 check_bugs_early();
876
877#if defined(CONFIG_VT)
878#if defined(CONFIG_VGA_CONSOLE)
879 conswitchp = &vga_con;
880#elif defined(CONFIG_DUMMY_CONSOLE)
881 conswitchp = &dummy_con;
882#endif
883#endif
884
885 arch_mem_init(cmdline_p);
886
887 resource_init();
888 plat_smp_setup();
889 prefill_possible_map();
890
891 cpu_cache_init();
892 paging_init();
893}
894
895unsigned long kernelsp[NR_CPUS];
896unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
897
898#ifdef CONFIG_USE_OF
899unsigned long fw_passed_dtb;
900#endif
901
902#ifdef CONFIG_DEBUG_FS
903struct dentry *mips_debugfs_dir;
904static int __init debugfs_mips(void)
905{
906 struct dentry *d;
907
908 d = debugfs_create_dir("mips", NULL);
909 if (!d)
910 return -ENOMEM;
911 mips_debugfs_dir = d;
912 return 0;
913}
914arch_initcall(debugfs_mips);
915#endif
1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 1995 Linus Torvalds
7 * Copyright (C) 1995 Waldorf Electronics
8 * Copyright (C) 1994, 95, 96, 97, 98, 99, 2000, 01, 02, 03 Ralf Baechle
9 * Copyright (C) 1996 Stoned Elipot
10 * Copyright (C) 1999 Silicon Graphics, Inc.
11 * Copyright (C) 2000, 2001, 2002, 2007 Maciej W. Rozycki
12 */
13#include <linux/init.h>
14#include <linux/ioport.h>
15#include <linux/export.h>
16#include <linux/screen_info.h>
17#include <linux/memblock.h>
18#include <linux/bootmem.h>
19#include <linux/initrd.h>
20#include <linux/root_dev.h>
21#include <linux/highmem.h>
22#include <linux/console.h>
23#include <linux/pfn.h>
24#include <linux/debugfs.h>
25#include <linux/kexec.h>
26#include <linux/sizes.h>
27
28#include <asm/addrspace.h>
29#include <asm/bootinfo.h>
30#include <asm/bugs.h>
31#include <asm/cache.h>
32#include <asm/cpu.h>
33#include <asm/sections.h>
34#include <asm/setup.h>
35#include <asm/smp-ops.h>
36#include <asm/prom.h>
37
38struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;
39
40EXPORT_SYMBOL(cpu_data);
41
42#ifdef CONFIG_VT
43struct screen_info screen_info;
44#endif
45
46/*
47 * Despite it's name this variable is even if we don't have PCI
48 */
49unsigned int PCI_DMA_BUS_IS_PHYS;
50
51EXPORT_SYMBOL(PCI_DMA_BUS_IS_PHYS);
52
53/*
54 * Setup information
55 *
56 * These are initialized so they are in the .data section
57 */
58unsigned long mips_machtype __read_mostly = MACH_UNKNOWN;
59
60EXPORT_SYMBOL(mips_machtype);
61
62struct boot_mem_map boot_mem_map;
63
64static char __initdata command_line[COMMAND_LINE_SIZE];
65char __initdata arcs_cmdline[COMMAND_LINE_SIZE];
66
67#ifdef CONFIG_CMDLINE_BOOL
68static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
69#endif
70
71/*
72 * mips_io_port_base is the begin of the address space to which x86 style
73 * I/O ports are mapped.
74 */
75const unsigned long mips_io_port_base = -1;
76EXPORT_SYMBOL(mips_io_port_base);
77
78static struct resource code_resource = { .name = "Kernel code", };
79static struct resource data_resource = { .name = "Kernel data", };
80
81static void *detect_magic __initdata = detect_memory_region;
82
83void __init add_memory_region(phys_t start, phys_t size, long type)
84{
85 int x = boot_mem_map.nr_map;
86 int i;
87
88 /* Sanity check */
89 if (start + size < start) {
90 pr_warning("Trying to add an invalid memory region, skipped\n");
91 return;
92 }
93
94 /*
95 * Try to merge with existing entry, if any.
96 */
97 for (i = 0; i < boot_mem_map.nr_map; i++) {
98 struct boot_mem_map_entry *entry = boot_mem_map.map + i;
99 unsigned long top;
100
101 if (entry->type != type)
102 continue;
103
104 if (start + size < entry->addr)
105 continue; /* no overlap */
106
107 if (entry->addr + entry->size < start)
108 continue; /* no overlap */
109
110 top = max(entry->addr + entry->size, start + size);
111 entry->addr = min(entry->addr, start);
112 entry->size = top - entry->addr;
113
114 return;
115 }
116
117 if (boot_mem_map.nr_map == BOOT_MEM_MAP_MAX) {
118 pr_err("Ooops! Too many entries in the memory map!\n");
119 return;
120 }
121
122 boot_mem_map.map[x].addr = start;
123 boot_mem_map.map[x].size = size;
124 boot_mem_map.map[x].type = type;
125 boot_mem_map.nr_map++;
126}
127
128void __init detect_memory_region(phys_t start, phys_t sz_min, phys_t sz_max)
129{
130 void *dm = &detect_magic;
131 phys_t size;
132
133 for (size = sz_min; size < sz_max; size <<= 1) {
134 if (!memcmp(dm, dm + size, sizeof(detect_magic)))
135 break;
136 }
137
138 pr_debug("Memory: %lluMB of RAM detected at 0x%llx (min: %lluMB, max: %lluMB)\n",
139 ((unsigned long long) size) / SZ_1M,
140 (unsigned long long) start,
141 ((unsigned long long) sz_min) / SZ_1M,
142 ((unsigned long long) sz_max) / SZ_1M);
143
144 add_memory_region(start, size, BOOT_MEM_RAM);
145}
146
147static void __init print_memory_map(void)
148{
149 int i;
150 const int field = 2 * sizeof(unsigned long);
151
152 for (i = 0; i < boot_mem_map.nr_map; i++) {
153 printk(KERN_INFO " memory: %0*Lx @ %0*Lx ",
154 field, (unsigned long long) boot_mem_map.map[i].size,
155 field, (unsigned long long) boot_mem_map.map[i].addr);
156
157 switch (boot_mem_map.map[i].type) {
158 case BOOT_MEM_RAM:
159 printk(KERN_CONT "(usable)\n");
160 break;
161 case BOOT_MEM_INIT_RAM:
162 printk(KERN_CONT "(usable after init)\n");
163 break;
164 case BOOT_MEM_ROM_DATA:
165 printk(KERN_CONT "(ROM data)\n");
166 break;
167 case BOOT_MEM_RESERVED:
168 printk(KERN_CONT "(reserved)\n");
169 break;
170 default:
171 printk(KERN_CONT "type %lu\n", boot_mem_map.map[i].type);
172 break;
173 }
174 }
175}
176
177/*
178 * Manage initrd
179 */
180#ifdef CONFIG_BLK_DEV_INITRD
181
182static int __init rd_start_early(char *p)
183{
184 unsigned long start = memparse(p, &p);
185
186#ifdef CONFIG_64BIT
187 /* Guess if the sign extension was forgotten by bootloader */
188 if (start < XKPHYS)
189 start = (int)start;
190#endif
191 initrd_start = start;
192 initrd_end += start;
193 return 0;
194}
195early_param("rd_start", rd_start_early);
196
197static int __init rd_size_early(char *p)
198{
199 initrd_end += memparse(p, &p);
200 return 0;
201}
202early_param("rd_size", rd_size_early);
203
204/* it returns the next free pfn after initrd */
205static unsigned long __init init_initrd(void)
206{
207 unsigned long end;
208
209 /*
210 * Board specific code or command line parser should have
211 * already set up initrd_start and initrd_end. In these cases
212 * perfom sanity checks and use them if all looks good.
213 */
214 if (!initrd_start || initrd_end <= initrd_start)
215 goto disable;
216
217 if (initrd_start & ~PAGE_MASK) {
218 pr_err("initrd start must be page aligned\n");
219 goto disable;
220 }
221 if (initrd_start < PAGE_OFFSET) {
222 pr_err("initrd start < PAGE_OFFSET\n");
223 goto disable;
224 }
225
226 /*
227 * Sanitize initrd addresses. For example firmware
228 * can't guess if they need to pass them through
229 * 64-bits values if the kernel has been built in pure
230 * 32-bit. We need also to switch from KSEG0 to XKPHYS
231 * addresses now, so the code can now safely use __pa().
232 */
233 end = __pa(initrd_end);
234 initrd_end = (unsigned long)__va(end);
235 initrd_start = (unsigned long)__va(__pa(initrd_start));
236
237 ROOT_DEV = Root_RAM0;
238 return PFN_UP(end);
239disable:
240 initrd_start = 0;
241 initrd_end = 0;
242 return 0;
243}
244
245static void __init finalize_initrd(void)
246{
247 unsigned long size = initrd_end - initrd_start;
248
249 if (size == 0) {
250 printk(KERN_INFO "Initrd not found or empty");
251 goto disable;
252 }
253 if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
254 printk(KERN_ERR "Initrd extends beyond end of memory");
255 goto disable;
256 }
257
258 reserve_bootmem(__pa(initrd_start), size, BOOTMEM_DEFAULT);
259 initrd_below_start_ok = 1;
260
261 pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",
262 initrd_start, size);
263 return;
264disable:
265 printk(KERN_CONT " - disabling initrd\n");
266 initrd_start = 0;
267 initrd_end = 0;
268}
269
270#else /* !CONFIG_BLK_DEV_INITRD */
271
272static unsigned long __init init_initrd(void)
273{
274 return 0;
275}
276
277#define finalize_initrd() do {} while (0)
278
279#endif
280
281/*
282 * Initialize the bootmem allocator. It also setup initrd related data
283 * if needed.
284 */
285#ifdef CONFIG_SGI_IP27
286
287static void __init bootmem_init(void)
288{
289 init_initrd();
290 finalize_initrd();
291}
292
293#else /* !CONFIG_SGI_IP27 */
294
295static void __init bootmem_init(void)
296{
297 unsigned long reserved_end;
298 unsigned long mapstart = ~0UL;
299 unsigned long bootmap_size;
300 int i;
301
302 /*
303 * Sanity check any INITRD first. We don't take it into account
304 * for bootmem setup initially, rely on the end-of-kernel-code
305 * as our memory range starting point. Once bootmem is inited we
306 * will reserve the area used for the initrd.
307 */
308 init_initrd();
309 reserved_end = (unsigned long) PFN_UP(__pa_symbol(&_end));
310
311 /*
312 * max_low_pfn is not a number of pages. The number of pages
313 * of the system is given by 'max_low_pfn - min_low_pfn'.
314 */
315 min_low_pfn = ~0UL;
316 max_low_pfn = 0;
317
318 /*
319 * Find the highest page frame number we have available.
320 */
321 for (i = 0; i < boot_mem_map.nr_map; i++) {
322 unsigned long start, end;
323
324 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
325 continue;
326
327 start = PFN_UP(boot_mem_map.map[i].addr);
328 end = PFN_DOWN(boot_mem_map.map[i].addr
329 + boot_mem_map.map[i].size);
330
331 if (end > max_low_pfn)
332 max_low_pfn = end;
333 if (start < min_low_pfn)
334 min_low_pfn = start;
335 if (end <= reserved_end)
336 continue;
337 if (start >= mapstart)
338 continue;
339 mapstart = max(reserved_end, start);
340 }
341
342 if (min_low_pfn >= max_low_pfn)
343 panic("Incorrect memory mapping !!!");
344 if (min_low_pfn > ARCH_PFN_OFFSET) {
345 pr_info("Wasting %lu bytes for tracking %lu unused pages\n",
346 (min_low_pfn - ARCH_PFN_OFFSET) * sizeof(struct page),
347 min_low_pfn - ARCH_PFN_OFFSET);
348 } else if (min_low_pfn < ARCH_PFN_OFFSET) {
349 pr_info("%lu free pages won't be used\n",
350 ARCH_PFN_OFFSET - min_low_pfn);
351 }
352 min_low_pfn = ARCH_PFN_OFFSET;
353
354 /*
355 * Determine low and high memory ranges
356 */
357 max_pfn = max_low_pfn;
358 if (max_low_pfn > PFN_DOWN(HIGHMEM_START)) {
359#ifdef CONFIG_HIGHMEM
360 highstart_pfn = PFN_DOWN(HIGHMEM_START);
361 highend_pfn = max_low_pfn;
362#endif
363 max_low_pfn = PFN_DOWN(HIGHMEM_START);
364 }
365
366#ifdef CONFIG_BLK_DEV_INITRD
367 /*
368 * mapstart should be after initrd_end
369 */
370 if (initrd_end)
371 mapstart = max(mapstart, (unsigned long)PFN_UP(__pa(initrd_end)));
372#endif
373
374 /*
375 * Initialize the boot-time allocator with low memory only.
376 */
377 bootmap_size = init_bootmem_node(NODE_DATA(0), mapstart,
378 min_low_pfn, max_low_pfn);
379
380
381 for (i = 0; i < boot_mem_map.nr_map; i++) {
382 unsigned long start, end;
383
384 start = PFN_UP(boot_mem_map.map[i].addr);
385 end = PFN_DOWN(boot_mem_map.map[i].addr
386 + boot_mem_map.map[i].size);
387
388 if (start <= min_low_pfn)
389 start = min_low_pfn;
390 if (start >= end)
391 continue;
392
393#ifndef CONFIG_HIGHMEM
394 if (end > max_low_pfn)
395 end = max_low_pfn;
396
397 /*
398 * ... finally, is the area going away?
399 */
400 if (end <= start)
401 continue;
402#endif
403
404 memblock_add_node(PFN_PHYS(start), PFN_PHYS(end - start), 0);
405 }
406
407 /*
408 * Register fully available low RAM pages with the bootmem allocator.
409 */
410 for (i = 0; i < boot_mem_map.nr_map; i++) {
411 unsigned long start, end, size;
412
413 start = PFN_UP(boot_mem_map.map[i].addr);
414 end = PFN_DOWN(boot_mem_map.map[i].addr
415 + boot_mem_map.map[i].size);
416
417 /*
418 * Reserve usable memory.
419 */
420 switch (boot_mem_map.map[i].type) {
421 case BOOT_MEM_RAM:
422 break;
423 case BOOT_MEM_INIT_RAM:
424 memory_present(0, start, end);
425 continue;
426 default:
427 /* Not usable memory */
428 continue;
429 }
430
431 /*
432 * We are rounding up the start address of usable memory
433 * and at the end of the usable range downwards.
434 */
435 if (start >= max_low_pfn)
436 continue;
437 if (start < reserved_end)
438 start = reserved_end;
439 if (end > max_low_pfn)
440 end = max_low_pfn;
441
442 /*
443 * ... finally, is the area going away?
444 */
445 if (end <= start)
446 continue;
447 size = end - start;
448
449 /* Register lowmem ranges */
450 free_bootmem(PFN_PHYS(start), size << PAGE_SHIFT);
451 memory_present(0, start, end);
452 }
453
454 /*
455 * Reserve the bootmap memory.
456 */
457 reserve_bootmem(PFN_PHYS(mapstart), bootmap_size, BOOTMEM_DEFAULT);
458
459 /*
460 * Reserve initrd memory if needed.
461 */
462 finalize_initrd();
463}
464
465#endif /* CONFIG_SGI_IP27 */
466
467/*
468 * arch_mem_init - initialize memory management subsystem
469 *
470 * o plat_mem_setup() detects the memory configuration and will record detected
471 * memory areas using add_memory_region.
472 *
473 * At this stage the memory configuration of the system is known to the
474 * kernel but generic memory management system is still entirely uninitialized.
475 *
476 * o bootmem_init()
477 * o sparse_init()
478 * o paging_init()
479 *
480 * At this stage the bootmem allocator is ready to use.
481 *
482 * NOTE: historically plat_mem_setup did the entire platform initialization.
483 * This was rather impractical because it meant plat_mem_setup had to
484 * get away without any kind of memory allocator. To keep old code from
485 * breaking plat_setup was just renamed to plat_setup and a second platform
486 * initialization hook for anything else was introduced.
487 */
488
489static int usermem __initdata;
490
491static int __init early_parse_mem(char *p)
492{
493 unsigned long start, size;
494
495 /*
496 * If a user specifies memory size, we
497 * blow away any automatically generated
498 * size.
499 */
500 if (usermem == 0) {
501 boot_mem_map.nr_map = 0;
502 usermem = 1;
503 }
504 start = 0;
505 size = memparse(p, &p);
506 if (*p == '@')
507 start = memparse(p + 1, &p);
508
509 add_memory_region(start, size, BOOT_MEM_RAM);
510 return 0;
511}
512early_param("mem", early_parse_mem);
513
514#ifdef CONFIG_PROC_VMCORE
515unsigned long setup_elfcorehdr, setup_elfcorehdr_size;
516static int __init early_parse_elfcorehdr(char *p)
517{
518 int i;
519
520 setup_elfcorehdr = memparse(p, &p);
521
522 for (i = 0; i < boot_mem_map.nr_map; i++) {
523 unsigned long start = boot_mem_map.map[i].addr;
524 unsigned long end = (boot_mem_map.map[i].addr +
525 boot_mem_map.map[i].size);
526 if (setup_elfcorehdr >= start && setup_elfcorehdr < end) {
527 /*
528 * Reserve from the elf core header to the end of
529 * the memory segment, that should all be kdump
530 * reserved memory.
531 */
532 setup_elfcorehdr_size = end - setup_elfcorehdr;
533 break;
534 }
535 }
536 /*
537 * If we don't find it in the memory map, then we shouldn't
538 * have to worry about it, as the new kernel won't use it.
539 */
540 return 0;
541}
542early_param("elfcorehdr", early_parse_elfcorehdr);
543#endif
544
545static void __init arch_mem_addpart(phys_t mem, phys_t end, int type)
546{
547 phys_t size;
548 int i;
549
550 size = end - mem;
551 if (!size)
552 return;
553
554 /* Make sure it is in the boot_mem_map */
555 for (i = 0; i < boot_mem_map.nr_map; i++) {
556 if (mem >= boot_mem_map.map[i].addr &&
557 mem < (boot_mem_map.map[i].addr +
558 boot_mem_map.map[i].size))
559 return;
560 }
561 add_memory_region(mem, size, type);
562}
563
564#ifdef CONFIG_KEXEC
565static inline unsigned long long get_total_mem(void)
566{
567 unsigned long long total;
568
569 total = max_pfn - min_low_pfn;
570 return total << PAGE_SHIFT;
571}
572
573static void __init mips_parse_crashkernel(void)
574{
575 unsigned long long total_mem;
576 unsigned long long crash_size, crash_base;
577 int ret;
578
579 total_mem = get_total_mem();
580 ret = parse_crashkernel(boot_command_line, total_mem,
581 &crash_size, &crash_base);
582 if (ret != 0 || crash_size <= 0)
583 return;
584
585 crashk_res.start = crash_base;
586 crashk_res.end = crash_base + crash_size - 1;
587}
588
589static void __init request_crashkernel(struct resource *res)
590{
591 int ret;
592
593 ret = request_resource(res, &crashk_res);
594 if (!ret)
595 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",
596 (unsigned long)((crashk_res.end -
597 crashk_res.start + 1) >> 20),
598 (unsigned long)(crashk_res.start >> 20));
599}
600#else /* !defined(CONFIG_KEXEC) */
601static void __init mips_parse_crashkernel(void)
602{
603}
604
605static void __init request_crashkernel(struct resource *res)
606{
607}
608#endif /* !defined(CONFIG_KEXEC) */
609
610static void __init arch_mem_init(char **cmdline_p)
611{
612 extern void plat_mem_setup(void);
613
614 /* call board setup routine */
615 plat_mem_setup();
616
617 /*
618 * Make sure all kernel memory is in the maps. The "UP" and
619 * "DOWN" are opposite for initdata since if it crosses over
620 * into another memory section you don't want that to be
621 * freed when the initdata is freed.
622 */
623 arch_mem_addpart(PFN_DOWN(__pa_symbol(&_text)) << PAGE_SHIFT,
624 PFN_UP(__pa_symbol(&_edata)) << PAGE_SHIFT,
625 BOOT_MEM_RAM);
626 arch_mem_addpart(PFN_UP(__pa_symbol(&__init_begin)) << PAGE_SHIFT,
627 PFN_DOWN(__pa_symbol(&__init_end)) << PAGE_SHIFT,
628 BOOT_MEM_INIT_RAM);
629
630 pr_info("Determined physical RAM map:\n");
631 print_memory_map();
632
633#ifdef CONFIG_CMDLINE_BOOL
634#ifdef CONFIG_CMDLINE_OVERRIDE
635 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
636#else
637 if (builtin_cmdline[0]) {
638 strlcat(arcs_cmdline, " ", COMMAND_LINE_SIZE);
639 strlcat(arcs_cmdline, builtin_cmdline, COMMAND_LINE_SIZE);
640 }
641 strlcpy(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
642#endif
643#else
644 strlcpy(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
645#endif
646 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
647
648 *cmdline_p = command_line;
649
650 parse_early_param();
651
652 if (usermem) {
653 pr_info("User-defined physical RAM map:\n");
654 print_memory_map();
655 }
656
657 bootmem_init();
658#ifdef CONFIG_PROC_VMCORE
659 if (setup_elfcorehdr && setup_elfcorehdr_size) {
660 printk(KERN_INFO "kdump reserved memory at %lx-%lx\n",
661 setup_elfcorehdr, setup_elfcorehdr_size);
662 reserve_bootmem(setup_elfcorehdr, setup_elfcorehdr_size,
663 BOOTMEM_DEFAULT);
664 }
665#endif
666
667 mips_parse_crashkernel();
668#ifdef CONFIG_KEXEC
669 if (crashk_res.start != crashk_res.end)
670 reserve_bootmem(crashk_res.start,
671 crashk_res.end - crashk_res.start + 1,
672 BOOTMEM_DEFAULT);
673#endif
674 device_tree_init();
675 sparse_init();
676 plat_swiotlb_setup();
677 paging_init();
678}
679
680static void __init resource_init(void)
681{
682 int i;
683
684 if (UNCAC_BASE != IO_BASE)
685 return;
686
687 code_resource.start = __pa_symbol(&_text);
688 code_resource.end = __pa_symbol(&_etext) - 1;
689 data_resource.start = __pa_symbol(&_etext);
690 data_resource.end = __pa_symbol(&_edata) - 1;
691
692 for (i = 0; i < boot_mem_map.nr_map; i++) {
693 struct resource *res;
694 unsigned long start, end;
695
696 start = boot_mem_map.map[i].addr;
697 end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1;
698 if (start >= HIGHMEM_START)
699 continue;
700 if (end >= HIGHMEM_START)
701 end = HIGHMEM_START - 1;
702
703 res = alloc_bootmem(sizeof(struct resource));
704 switch (boot_mem_map.map[i].type) {
705 case BOOT_MEM_RAM:
706 case BOOT_MEM_INIT_RAM:
707 case BOOT_MEM_ROM_DATA:
708 res->name = "System RAM";
709 break;
710 case BOOT_MEM_RESERVED:
711 default:
712 res->name = "reserved";
713 }
714
715 res->start = start;
716 res->end = end;
717
718 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
719 request_resource(&iomem_resource, res);
720
721 /*
722 * We don't know which RAM region contains kernel data,
723 * so we try it repeatedly and let the resource manager
724 * test it.
725 */
726 request_resource(res, &code_resource);
727 request_resource(res, &data_resource);
728 request_crashkernel(res);
729 }
730}
731
732void __init setup_arch(char **cmdline_p)
733{
734 cpu_probe();
735 prom_init();
736
737#ifdef CONFIG_EARLY_PRINTK
738 setup_early_printk();
739#endif
740 cpu_report();
741 check_bugs_early();
742
743#if defined(CONFIG_VT)
744#if defined(CONFIG_VGA_CONSOLE)
745 conswitchp = &vga_con;
746#elif defined(CONFIG_DUMMY_CONSOLE)
747 conswitchp = &dummy_con;
748#endif
749#endif
750
751 arch_mem_init(cmdline_p);
752
753 resource_init();
754 plat_smp_setup();
755
756 cpu_cache_init();
757}
758
759unsigned long kernelsp[NR_CPUS];
760unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
761
762#ifdef CONFIG_DEBUG_FS
763struct dentry *mips_debugfs_dir;
764static int __init debugfs_mips(void)
765{
766 struct dentry *d;
767
768 d = debugfs_create_dir("mips", NULL);
769 if (!d)
770 return -ENOMEM;
771 mips_debugfs_dir = d;
772 return 0;
773}
774arch_initcall(debugfs_mips);
775#endif