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