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/initrd.h>
19 #include <linux/root_dev.h>
20 #include <linux/highmem.h>
21 #include <linux/console.h>
22 #include <linux/pfn.h>
23 #include <linux/debugfs.h>
24 #include <linux/kexec.h>
25 #include <linux/sizes.h>
26 #include <linux/device.h>
27 #include <linux/dma-contiguous.h>
28 #include <linux/decompress/generic.h>
29 #include <linux/of_fdt.h>
30 #include <linux/of_reserved_mem.h>
31
32 #include <asm/addrspace.h>
33 #include <asm/bootinfo.h>
34 #include <asm/bugs.h>
35 #include <asm/cache.h>
36 #include <asm/cdmm.h>
37 #include <asm/cpu.h>
38 #include <asm/debug.h>
39 #include <asm/dma-coherence.h>
40 #include <asm/sections.h>
41 #include <asm/setup.h>
42 #include <asm/smp-ops.h>
43 #include <asm/prom.h>
44
45 #ifdef CONFIG_MIPS_ELF_APPENDED_DTB
46 const char __section(.appended_dtb) __appended_dtb[0x100000];
47 #endif /* CONFIG_MIPS_ELF_APPENDED_DTB */
48
49 struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;
50
51 EXPORT_SYMBOL(cpu_data);
52
53 #ifdef CONFIG_VT
54 struct screen_info screen_info;
55 #endif
56
57 /*
58 * Setup information
59 *
60 * These are initialized so they are in the .data section
61 */
62 unsigned long mips_machtype __read_mostly = MACH_UNKNOWN;
63
64 EXPORT_SYMBOL(mips_machtype);
65
66 static char __initdata command_line[COMMAND_LINE_SIZE];
67 char __initdata arcs_cmdline[COMMAND_LINE_SIZE];
68
69 #ifdef CONFIG_CMDLINE_BOOL
70 static 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 */
77 unsigned long mips_io_port_base = -1;
78 EXPORT_SYMBOL(mips_io_port_base);
79
80 static struct resource code_resource = { .name = "Kernel code", };
81 static struct resource data_resource = { .name = "Kernel data", };
82 static struct resource bss_resource = { .name = "Kernel bss", };
83
84 static void *detect_magic __initdata = detect_memory_region;
85
86 #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET
87 unsigned long ARCH_PFN_OFFSET;
88 EXPORT_SYMBOL(ARCH_PFN_OFFSET);
89 #endif
90
add_memory_region(phys_addr_t start,phys_addr_t size,long type)91 void __init add_memory_region(phys_addr_t start, phys_addr_t size, long type)
92 {
93 /*
94 * Note: This function only exists for historical reason,
95 * new code should use memblock_add or memblock_add_node instead.
96 */
97
98 /*
99 * If the region reaches the top of the physical address space, adjust
100 * the size slightly so that (start + size) doesn't overflow
101 */
102 if (start + size - 1 == PHYS_ADDR_MAX)
103 --size;
104
105 /* Sanity check */
106 if (start + size < start) {
107 pr_warn("Trying to add an invalid memory region, skipped\n");
108 return;
109 }
110
111 if (start < PHYS_OFFSET)
112 return;
113
114 memblock_add(start, size);
115 /* Reserve any memory except the ordinary RAM ranges. */
116 switch (type) {
117 case BOOT_MEM_RAM:
118 break;
119
120 case BOOT_MEM_NOMAP: /* Discard the range from the system. */
121 memblock_remove(start, size);
122 break;
123
124 default: /* Reserve the rest of the memory types at boot time */
125 memblock_reserve(start, size);
126 break;
127 }
128 }
129
detect_memory_region(phys_addr_t start,phys_addr_t sz_min,phys_addr_t sz_max)130 void __init detect_memory_region(phys_addr_t start, phys_addr_t sz_min, phys_addr_t sz_max)
131 {
132 void *dm = &detect_magic;
133 phys_addr_t size;
134
135 for (size = sz_min; size < sz_max; size <<= 1) {
136 if (!memcmp(dm, dm + size, sizeof(detect_magic)))
137 break;
138 }
139
140 pr_debug("Memory: %lluMB of RAM detected at 0x%llx (min: %lluMB, max: %lluMB)\n",
141 ((unsigned long long) size) / SZ_1M,
142 (unsigned long long) start,
143 ((unsigned long long) sz_min) / SZ_1M,
144 ((unsigned long long) sz_max) / SZ_1M);
145
146 add_memory_region(start, size, BOOT_MEM_RAM);
147 }
148
149 /*
150 * Manage initrd
151 */
152 #ifdef CONFIG_BLK_DEV_INITRD
153
rd_start_early(char * p)154 static int __init rd_start_early(char *p)
155 {
156 unsigned long start = memparse(p, &p);
157
158 #ifdef CONFIG_64BIT
159 /* Guess if the sign extension was forgotten by bootloader */
160 if (start < XKPHYS)
161 start = (int)start;
162 #endif
163 initrd_start = start;
164 initrd_end += start;
165 return 0;
166 }
167 early_param("rd_start", rd_start_early);
168
rd_size_early(char * p)169 static int __init rd_size_early(char *p)
170 {
171 initrd_end += memparse(p, &p);
172 return 0;
173 }
174 early_param("rd_size", rd_size_early);
175
176 /* it returns the next free pfn after initrd */
init_initrd(void)177 static unsigned long __init init_initrd(void)
178 {
179 unsigned long end;
180
181 /*
182 * Board specific code or command line parser should have
183 * already set up initrd_start and initrd_end. In these cases
184 * perfom sanity checks and use them if all looks good.
185 */
186 if (!initrd_start || initrd_end <= initrd_start)
187 goto disable;
188
189 if (initrd_start & ~PAGE_MASK) {
190 pr_err("initrd start must be page aligned\n");
191 goto disable;
192 }
193 if (initrd_start < PAGE_OFFSET) {
194 pr_err("initrd start < PAGE_OFFSET\n");
195 goto disable;
196 }
197
198 /*
199 * Sanitize initrd addresses. For example firmware
200 * can't guess if they need to pass them through
201 * 64-bits values if the kernel has been built in pure
202 * 32-bit. We need also to switch from KSEG0 to XKPHYS
203 * addresses now, so the code can now safely use __pa().
204 */
205 end = __pa(initrd_end);
206 initrd_end = (unsigned long)__va(end);
207 initrd_start = (unsigned long)__va(__pa(initrd_start));
208
209 ROOT_DEV = Root_RAM0;
210 return PFN_UP(end);
211 disable:
212 initrd_start = 0;
213 initrd_end = 0;
214 return 0;
215 }
216
217 /* In some conditions (e.g. big endian bootloader with a little endian
218 kernel), the initrd might appear byte swapped. Try to detect this and
219 byte swap it if needed. */
maybe_bswap_initrd(void)220 static void __init maybe_bswap_initrd(void)
221 {
222 #if defined(CONFIG_CPU_CAVIUM_OCTEON)
223 u64 buf;
224
225 /* Check for CPIO signature */
226 if (!memcmp((void *)initrd_start, "070701", 6))
227 return;
228
229 /* Check for compressed initrd */
230 if (decompress_method((unsigned char *)initrd_start, 8, NULL))
231 return;
232
233 /* Try again with a byte swapped header */
234 buf = swab64p((u64 *)initrd_start);
235 if (!memcmp(&buf, "070701", 6) ||
236 decompress_method((unsigned char *)(&buf), 8, NULL)) {
237 unsigned long i;
238
239 pr_info("Byteswapped initrd detected\n");
240 for (i = initrd_start; i < ALIGN(initrd_end, 8); i += 8)
241 swab64s((u64 *)i);
242 }
243 #endif
244 }
245
finalize_initrd(void)246 static void __init finalize_initrd(void)
247 {
248 unsigned long size = initrd_end - initrd_start;
249
250 if (size == 0) {
251 printk(KERN_INFO "Initrd not found or empty");
252 goto disable;
253 }
254 if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
255 printk(KERN_ERR "Initrd extends beyond end of memory");
256 goto disable;
257 }
258
259 maybe_bswap_initrd();
260
261 memblock_reserve(__pa(initrd_start), size);
262 initrd_below_start_ok = 1;
263
264 pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",
265 initrd_start, size);
266 return;
267 disable:
268 printk(KERN_CONT " - disabling initrd\n");
269 initrd_start = 0;
270 initrd_end = 0;
271 }
272
273 #else /* !CONFIG_BLK_DEV_INITRD */
274
init_initrd(void)275 static unsigned long __init init_initrd(void)
276 {
277 return 0;
278 }
279
280 #define finalize_initrd() do {} while (0)
281
282 #endif
283
284 /*
285 * Initialize the bootmem allocator. It also setup initrd related data
286 * if needed.
287 */
288 #if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON3) && defined(CONFIG_NUMA))
289
bootmem_init(void)290 static void __init bootmem_init(void)
291 {
292 init_initrd();
293 finalize_initrd();
294 }
295
296 #else /* !CONFIG_SGI_IP27 */
297
bootmem_init(void)298 static void __init bootmem_init(void)
299 {
300 struct memblock_region *mem;
301 phys_addr_t ramstart, ramend;
302
303 ramstart = memblock_start_of_DRAM();
304 ramend = memblock_end_of_DRAM();
305
306 /*
307 * Sanity check any INITRD first. We don't take it into account
308 * for bootmem setup initially, rely on the end-of-kernel-code
309 * as our memory range starting point. Once bootmem is inited we
310 * will reserve the area used for the initrd.
311 */
312 init_initrd();
313
314 /* Reserve memory occupied by kernel. */
315 memblock_reserve(__pa_symbol(&_text),
316 __pa_symbol(&_end) - __pa_symbol(&_text));
317
318 /* max_low_pfn is not a number of pages but the end pfn of low mem */
319
320 #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET
321 ARCH_PFN_OFFSET = PFN_UP(ramstart);
322 #else
323 /*
324 * Reserve any memory between the start of RAM and PHYS_OFFSET
325 */
326 if (ramstart > PHYS_OFFSET)
327 memblock_reserve(PHYS_OFFSET, ramstart - PHYS_OFFSET);
328
329 if (PFN_UP(ramstart) > ARCH_PFN_OFFSET) {
330 pr_info("Wasting %lu bytes for tracking %lu unused pages\n",
331 (unsigned long)((PFN_UP(ramstart) - ARCH_PFN_OFFSET) * sizeof(struct page)),
332 (unsigned long)(PFN_UP(ramstart) - ARCH_PFN_OFFSET));
333 }
334 #endif
335
336 min_low_pfn = ARCH_PFN_OFFSET;
337 max_pfn = PFN_DOWN(ramend);
338 for_each_memblock(memory, mem) {
339 unsigned long start = memblock_region_memory_base_pfn(mem);
340 unsigned long end = memblock_region_memory_end_pfn(mem);
341
342 /*
343 * Skip highmem here so we get an accurate max_low_pfn if low
344 * memory stops short of high memory.
345 * If the region overlaps HIGHMEM_START, end is clipped so
346 * max_pfn excludes the highmem portion.
347 */
348 if (memblock_is_nomap(mem))
349 continue;
350 if (start >= PFN_DOWN(HIGHMEM_START))
351 continue;
352 if (end > PFN_DOWN(HIGHMEM_START))
353 end = PFN_DOWN(HIGHMEM_START);
354 if (end > max_low_pfn)
355 max_low_pfn = end;
356 }
357
358 if (min_low_pfn >= max_low_pfn)
359 panic("Incorrect memory mapping !!!");
360
361 if (max_pfn > PFN_DOWN(HIGHMEM_START)) {
362 #ifdef CONFIG_HIGHMEM
363 highstart_pfn = PFN_DOWN(HIGHMEM_START);
364 highend_pfn = max_pfn;
365 #else
366 max_low_pfn = PFN_DOWN(HIGHMEM_START);
367 max_pfn = max_low_pfn;
368 #endif
369 }
370
371
372 /*
373 * In any case the added to the memblock memory regions
374 * (highmem/lowmem, available/reserved, etc) are considered
375 * as present, so inform sparsemem about them.
376 */
377 memblocks_present();
378
379 /*
380 * Reserve initrd memory if needed.
381 */
382 finalize_initrd();
383 }
384
385 #endif /* CONFIG_SGI_IP27 */
386
387 static int usermem __initdata;
388
early_parse_mem(char * p)389 static int __init early_parse_mem(char *p)
390 {
391 phys_addr_t start, size;
392
393 /*
394 * If a user specifies memory size, we
395 * blow away any automatically generated
396 * size.
397 */
398 if (usermem == 0) {
399 usermem = 1;
400 memblock_remove(memblock_start_of_DRAM(),
401 memblock_end_of_DRAM() - memblock_start_of_DRAM());
402 }
403 start = 0;
404 size = memparse(p, &p);
405 if (*p == '@')
406 start = memparse(p + 1, &p);
407
408 add_memory_region(start, size, BOOT_MEM_RAM);
409
410 return 0;
411 }
412 early_param("mem", early_parse_mem);
413
early_parse_memmap(char * p)414 static int __init early_parse_memmap(char *p)
415 {
416 char *oldp;
417 u64 start_at, mem_size;
418
419 if (!p)
420 return -EINVAL;
421
422 if (!strncmp(p, "exactmap", 8)) {
423 pr_err("\"memmap=exactmap\" invalid on MIPS\n");
424 return 0;
425 }
426
427 oldp = p;
428 mem_size = memparse(p, &p);
429 if (p == oldp)
430 return -EINVAL;
431
432 if (*p == '@') {
433 start_at = memparse(p+1, &p);
434 add_memory_region(start_at, mem_size, BOOT_MEM_RAM);
435 } else if (*p == '#') {
436 pr_err("\"memmap=nn#ss\" (force ACPI data) invalid on MIPS\n");
437 return -EINVAL;
438 } else if (*p == '$') {
439 start_at = memparse(p+1, &p);
440 add_memory_region(start_at, mem_size, BOOT_MEM_RESERVED);
441 } else {
442 pr_err("\"memmap\" invalid format!\n");
443 return -EINVAL;
444 }
445
446 if (*p == '\0') {
447 usermem = 1;
448 return 0;
449 } else
450 return -EINVAL;
451 }
452 early_param("memmap", early_parse_memmap);
453
454 #ifdef CONFIG_PROC_VMCORE
455 unsigned long setup_elfcorehdr, setup_elfcorehdr_size;
early_parse_elfcorehdr(char * p)456 static int __init early_parse_elfcorehdr(char *p)
457 {
458 struct memblock_region *mem;
459
460 setup_elfcorehdr = memparse(p, &p);
461
462 for_each_memblock(memory, mem) {
463 unsigned long start = mem->base;
464 unsigned long end = start + mem->size;
465 if (setup_elfcorehdr >= start && setup_elfcorehdr < end) {
466 /*
467 * Reserve from the elf core header to the end of
468 * the memory segment, that should all be kdump
469 * reserved memory.
470 */
471 setup_elfcorehdr_size = end - setup_elfcorehdr;
472 break;
473 }
474 }
475 /*
476 * If we don't find it in the memory map, then we shouldn't
477 * have to worry about it, as the new kernel won't use it.
478 */
479 return 0;
480 }
481 early_param("elfcorehdr", early_parse_elfcorehdr);
482 #endif
483
484 #ifdef CONFIG_KEXEC
mips_parse_crashkernel(void)485 static void __init mips_parse_crashkernel(void)
486 {
487 unsigned long long total_mem;
488 unsigned long long crash_size, crash_base;
489 int ret;
490
491 total_mem = memblock_phys_mem_size();
492 ret = parse_crashkernel(boot_command_line, total_mem,
493 &crash_size, &crash_base);
494 if (ret != 0 || crash_size <= 0)
495 return;
496
497 if (!memblock_find_in_range(crash_base, crash_base + crash_size, crash_size, 0)) {
498 pr_warn("Invalid memory region reserved for crash kernel\n");
499 return;
500 }
501
502 crashk_res.start = crash_base;
503 crashk_res.end = crash_base + crash_size - 1;
504 }
505
request_crashkernel(struct resource * res)506 static void __init request_crashkernel(struct resource *res)
507 {
508 int ret;
509
510 if (crashk_res.start == crashk_res.end)
511 return;
512
513 ret = request_resource(res, &crashk_res);
514 if (!ret)
515 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",
516 (unsigned long)((crashk_res.end -
517 crashk_res.start + 1) >> 20),
518 (unsigned long)(crashk_res.start >> 20));
519 }
520 #else /* !defined(CONFIG_KEXEC) */
mips_parse_crashkernel(void)521 static void __init mips_parse_crashkernel(void)
522 {
523 }
524
request_crashkernel(struct resource * res)525 static void __init request_crashkernel(struct resource *res)
526 {
527 }
528 #endif /* !defined(CONFIG_KEXEC) */
529
check_kernel_sections_mem(void)530 static void __init check_kernel_sections_mem(void)
531 {
532 phys_addr_t start = PFN_PHYS(PFN_DOWN(__pa_symbol(&_text)));
533 phys_addr_t size = PFN_PHYS(PFN_UP(__pa_symbol(&_end))) - start;
534
535 if (!memblock_is_region_memory(start, size)) {
536 pr_info("Kernel sections are not in the memory maps\n");
537 memblock_add(start, size);
538 }
539 }
540
541 #define USE_PROM_CMDLINE IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_BOOTLOADER)
542 #define USE_DTB_CMDLINE IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_DTB)
543 #define EXTEND_WITH_PROM IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND)
544 #define BUILTIN_EXTEND_WITH_PROM \
545 IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND)
546
547 /*
548 * arch_mem_init - initialize memory management subsystem
549 *
550 * o plat_mem_setup() detects the memory configuration and will record detected
551 * memory areas using add_memory_region.
552 *
553 * At this stage the memory configuration of the system is known to the
554 * kernel but generic memory management system is still entirely uninitialized.
555 *
556 * o bootmem_init()
557 * o sparse_init()
558 * o paging_init()
559 * o dma_contiguous_reserve()
560 *
561 * At this stage the bootmem allocator is ready to use.
562 *
563 * NOTE: historically plat_mem_setup did the entire platform initialization.
564 * This was rather impractical because it meant plat_mem_setup had to
565 * get away without any kind of memory allocator. To keep old code from
566 * breaking plat_setup was just renamed to plat_mem_setup and a second platform
567 * initialization hook for anything else was introduced.
568 */
arch_mem_init(char ** cmdline_p)569 static void __init arch_mem_init(char **cmdline_p)
570 {
571 extern void plat_mem_setup(void);
572
573 /*
574 * Initialize boot_command_line to an innocuous but non-empty string in
575 * order to prevent early_init_dt_scan_chosen() from copying
576 * CONFIG_CMDLINE into it without our knowledge. We handle
577 * CONFIG_CMDLINE ourselves below & don't want to duplicate its
578 * content because repeating arguments can be problematic.
579 */
580 strlcpy(boot_command_line, " ", COMMAND_LINE_SIZE);
581
582 /* call board setup routine */
583 plat_mem_setup();
584 memblock_set_bottom_up(true);
585
586 #if defined(CONFIG_CMDLINE_BOOL) && defined(CONFIG_CMDLINE_OVERRIDE)
587 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
588 #else
589 if ((USE_PROM_CMDLINE && arcs_cmdline[0]) ||
590 (USE_DTB_CMDLINE && !boot_command_line[0]))
591 strlcpy(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
592
593 if (EXTEND_WITH_PROM && arcs_cmdline[0]) {
594 if (boot_command_line[0])
595 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
596 strlcat(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
597 }
598
599 #if defined(CONFIG_CMDLINE_BOOL)
600 if (builtin_cmdline[0]) {
601 if (boot_command_line[0])
602 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
603 strlcat(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
604 }
605
606 if (BUILTIN_EXTEND_WITH_PROM && arcs_cmdline[0]) {
607 if (boot_command_line[0])
608 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
609 strlcat(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
610 }
611 #endif
612 #endif
613 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
614
615 *cmdline_p = command_line;
616
617 parse_early_param();
618
619 if (usermem)
620 pr_info("User-defined physical RAM map overwrite\n");
621
622 check_kernel_sections_mem();
623
624 early_init_fdt_reserve_self();
625 early_init_fdt_scan_reserved_mem();
626
627 #ifndef CONFIG_NUMA
628 memblock_set_node(0, PHYS_ADDR_MAX, &memblock.memory, 0);
629 #endif
630 bootmem_init();
631
632 /*
633 * Prevent memblock from allocating high memory.
634 * This cannot be done before max_low_pfn is detected, so up
635 * to this point is possible to only reserve physical memory
636 * with memblock_reserve; memblock_alloc* can be used
637 * only after this point
638 */
639 memblock_set_current_limit(PFN_PHYS(max_low_pfn));
640
641 #ifdef CONFIG_PROC_VMCORE
642 if (setup_elfcorehdr && setup_elfcorehdr_size) {
643 printk(KERN_INFO "kdump reserved memory at %lx-%lx\n",
644 setup_elfcorehdr, setup_elfcorehdr_size);
645 memblock_reserve(setup_elfcorehdr, setup_elfcorehdr_size);
646 }
647 #endif
648
649 mips_parse_crashkernel();
650 #ifdef CONFIG_KEXEC
651 if (crashk_res.start != crashk_res.end)
652 memblock_reserve(crashk_res.start,
653 crashk_res.end - crashk_res.start + 1);
654 #endif
655 device_tree_init();
656 sparse_init();
657 plat_swiotlb_setup();
658
659 dma_contiguous_reserve(PFN_PHYS(max_low_pfn));
660
661 /* Reserve for hibernation. */
662 memblock_reserve(__pa_symbol(&__nosave_begin),
663 __pa_symbol(&__nosave_end) - __pa_symbol(&__nosave_begin));
664
665 fdt_init_reserved_mem();
666
667 memblock_dump_all();
668
669 early_memtest(PFN_PHYS(ARCH_PFN_OFFSET), PFN_PHYS(max_low_pfn));
670 }
671
resource_init(void)672 static void __init resource_init(void)
673 {
674 struct memblock_region *region;
675
676 if (UNCAC_BASE != IO_BASE)
677 return;
678
679 code_resource.start = __pa_symbol(&_text);
680 code_resource.end = __pa_symbol(&_etext) - 1;
681 data_resource.start = __pa_symbol(&_etext);
682 data_resource.end = __pa_symbol(&_edata) - 1;
683 bss_resource.start = __pa_symbol(&__bss_start);
684 bss_resource.end = __pa_symbol(&__bss_stop) - 1;
685
686 for_each_memblock(memory, region) {
687 phys_addr_t start = PFN_PHYS(memblock_region_memory_base_pfn(region));
688 phys_addr_t end = PFN_PHYS(memblock_region_memory_end_pfn(region)) - 1;
689 struct resource *res;
690
691 res = memblock_alloc(sizeof(struct resource), SMP_CACHE_BYTES);
692 if (!res)
693 panic("%s: Failed to allocate %zu bytes\n", __func__,
694 sizeof(struct resource));
695
696 res->start = start;
697 res->end = end;
698 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
699 res->name = "System RAM";
700
701 request_resource(&iomem_resource, res);
702
703 /*
704 * We don't know which RAM region contains kernel data,
705 * so we try it repeatedly and let the resource manager
706 * test it.
707 */
708 request_resource(res, &code_resource);
709 request_resource(res, &data_resource);
710 request_resource(res, &bss_resource);
711 request_crashkernel(res);
712 }
713 }
714
715 #ifdef CONFIG_SMP
prefill_possible_map(void)716 static void __init prefill_possible_map(void)
717 {
718 int i, possible = num_possible_cpus();
719
720 if (possible > nr_cpu_ids)
721 possible = nr_cpu_ids;
722
723 for (i = 0; i < possible; i++)
724 set_cpu_possible(i, true);
725 for (; i < NR_CPUS; i++)
726 set_cpu_possible(i, false);
727
728 nr_cpu_ids = possible;
729 }
730 #else
prefill_possible_map(void)731 static inline void prefill_possible_map(void) {}
732 #endif
733
setup_arch(char ** cmdline_p)734 void __init setup_arch(char **cmdline_p)
735 {
736 cpu_probe();
737 mips_cm_probe();
738 prom_init();
739
740 setup_early_fdc_console();
741 #ifdef CONFIG_EARLY_PRINTK
742 setup_early_printk();
743 #endif
744 cpu_report();
745 check_bugs_early();
746
747 #if defined(CONFIG_VT)
748 #if defined(CONFIG_VGA_CONSOLE)
749 conswitchp = &vga_con;
750 #elif defined(CONFIG_DUMMY_CONSOLE)
751 conswitchp = &dummy_con;
752 #endif
753 #endif
754
755 arch_mem_init(cmdline_p);
756
757 resource_init();
758 plat_smp_setup();
759 prefill_possible_map();
760
761 cpu_cache_init();
762 paging_init();
763 }
764
765 unsigned long kernelsp[NR_CPUS];
766 unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
767
768 #ifdef CONFIG_USE_OF
769 unsigned long fw_passed_dtb;
770 #endif
771
772 #ifdef CONFIG_DEBUG_FS
773 struct dentry *mips_debugfs_dir;
debugfs_mips(void)774 static int __init debugfs_mips(void)
775 {
776 mips_debugfs_dir = debugfs_create_dir("mips", NULL);
777 return 0;
778 }
779 arch_initcall(debugfs_mips);
780 #endif
781
782 #ifdef CONFIG_DMA_MAYBE_COHERENT
783 /* User defined DMA coherency from command line. */
784 enum coherent_io_user_state coherentio = IO_COHERENCE_DEFAULT;
785 EXPORT_SYMBOL_GPL(coherentio);
786 int hw_coherentio = 0; /* Actual hardware supported DMA coherency setting. */
787
setcoherentio(char * str)788 static int __init setcoherentio(char *str)
789 {
790 coherentio = IO_COHERENCE_ENABLED;
791 pr_info("Hardware DMA cache coherency (command line)\n");
792 return 0;
793 }
794 early_param("coherentio", setcoherentio);
795
setnocoherentio(char * str)796 static int __init setnocoherentio(char *str)
797 {
798 coherentio = IO_COHERENCE_DISABLED;
799 pr_info("Software DMA cache coherency (command line)\n");
800 return 0;
801 }
802 early_param("nocoherentio", setnocoherentio);
803 #endif
804
