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/cpu.h>
15 #include <linux/delay.h>
16 #include <linux/ioport.h>
17 #include <linux/export.h>
18 #include <linux/screen_info.h>
19 #include <linux/memblock.h>
20 #include <linux/initrd.h>
21 #include <linux/root_dev.h>
22 #include <linux/highmem.h>
23 #include <linux/console.h>
24 #include <linux/pfn.h>
25 #include <linux/debugfs.h>
26 #include <linux/kexec.h>
27 #include <linux/sizes.h>
28 #include <linux/device.h>
29 #include <linux/dma-contiguous.h>
30 #include <linux/decompress/generic.h>
31 #include <linux/of_fdt.h>
32 #include <linux/of_reserved_mem.h>
33
34 #include <asm/addrspace.h>
35 #include <asm/bootinfo.h>
36 #include <asm/bugs.h>
37 #include <asm/cache.h>
38 #include <asm/cdmm.h>
39 #include <asm/cpu.h>
40 #include <asm/debug.h>
41 #include <asm/dma-coherence.h>
42 #include <asm/sections.h>
43 #include <asm/setup.h>
44 #include <asm/smp-ops.h>
45 #include <asm/prom.h>
46
47 #ifdef CONFIG_MIPS_ELF_APPENDED_DTB
48 const char __section(.appended_dtb) __appended_dtb[0x100000];
49 #endif /* CONFIG_MIPS_ELF_APPENDED_DTB */
50
51 struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;
52
53 EXPORT_SYMBOL(cpu_data);
54
55 #ifdef CONFIG_VT
56 struct screen_info screen_info;
57 #endif
58
59 /*
60 * Setup information
61 *
62 * These are initialized so they are in the .data section
63 */
64 unsigned long mips_machtype __read_mostly = MACH_UNKNOWN;
65
66 EXPORT_SYMBOL(mips_machtype);
67
68 static char __initdata command_line[COMMAND_LINE_SIZE];
69 char __initdata arcs_cmdline[COMMAND_LINE_SIZE];
70
71 #ifdef CONFIG_CMDLINE_BOOL
72 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
73 #endif
74
75 /*
76 * mips_io_port_base is the begin of the address space to which x86 style
77 * I/O ports are mapped.
78 */
79 unsigned long mips_io_port_base = -1;
80 EXPORT_SYMBOL(mips_io_port_base);
81
82 static struct resource code_resource = { .name = "Kernel code", };
83 static struct resource data_resource = { .name = "Kernel data", };
84 static struct resource bss_resource = { .name = "Kernel bss", };
85
86 static void *detect_magic __initdata = detect_memory_region;
87
88 #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET
89 unsigned long ARCH_PFN_OFFSET;
90 EXPORT_SYMBOL(ARCH_PFN_OFFSET);
91 #endif
92
add_memory_region(phys_addr_t start,phys_addr_t size,long type)93 void __init add_memory_region(phys_addr_t start, phys_addr_t size, long type)
94 {
95 /*
96 * Note: This function only exists for historical reason,
97 * new code should use memblock_add or memblock_add_node instead.
98 */
99
100 /*
101 * If the region reaches the top of the physical address space, adjust
102 * the size slightly so that (start + size) doesn't overflow
103 */
104 if (start + size - 1 == PHYS_ADDR_MAX)
105 --size;
106
107 /* Sanity check */
108 if (start + size < start) {
109 pr_warn("Trying to add an invalid memory region, skipped\n");
110 return;
111 }
112
113 if (start < PHYS_OFFSET)
114 return;
115
116 memblock_add(start, size);
117 /* Reserve any memory except the ordinary RAM ranges. */
118 switch (type) {
119 case BOOT_MEM_RAM:
120 break;
121
122 case BOOT_MEM_NOMAP: /* Discard the range from the system. */
123 memblock_remove(start, size);
124 break;
125
126 default: /* Reserve the rest of the memory types at boot time */
127 memblock_reserve(start, size);
128 break;
129 }
130 }
131
detect_memory_region(phys_addr_t start,phys_addr_t sz_min,phys_addr_t sz_max)132 void __init detect_memory_region(phys_addr_t start, phys_addr_t sz_min, phys_addr_t sz_max)
133 {
134 void *dm = &detect_magic;
135 phys_addr_t size;
136
137 for (size = sz_min; size < sz_max; size <<= 1) {
138 if (!memcmp(dm, dm + size, sizeof(detect_magic)))
139 break;
140 }
141
142 pr_debug("Memory: %lluMB of RAM detected at 0x%llx (min: %lluMB, max: %lluMB)\n",
143 ((unsigned long long) size) / SZ_1M,
144 (unsigned long long) start,
145 ((unsigned long long) sz_min) / SZ_1M,
146 ((unsigned long long) sz_max) / SZ_1M);
147
148 add_memory_region(start, size, BOOT_MEM_RAM);
149 }
150
151 /*
152 * Manage initrd
153 */
154 #ifdef CONFIG_BLK_DEV_INITRD
155
rd_start_early(char * p)156 static int __init rd_start_early(char *p)
157 {
158 unsigned long start = memparse(p, &p);
159
160 #ifdef CONFIG_64BIT
161 /* Guess if the sign extension was forgotten by bootloader */
162 if (start < XKPHYS)
163 start = (int)start;
164 #endif
165 initrd_start = start;
166 initrd_end += start;
167 return 0;
168 }
169 early_param("rd_start", rd_start_early);
170
rd_size_early(char * p)171 static int __init rd_size_early(char *p)
172 {
173 initrd_end += memparse(p, &p);
174 return 0;
175 }
176 early_param("rd_size", rd_size_early);
177
178 /* it returns the next free pfn after initrd */
init_initrd(void)179 static unsigned long __init init_initrd(void)
180 {
181 unsigned long end;
182
183 /*
184 * Board specific code or command line parser should have
185 * already set up initrd_start and initrd_end. In these cases
186 * perfom sanity checks and use them if all looks good.
187 */
188 if (!initrd_start || initrd_end <= initrd_start)
189 goto disable;
190
191 if (initrd_start & ~PAGE_MASK) {
192 pr_err("initrd start must be page aligned\n");
193 goto disable;
194 }
195
196 /*
197 * Sanitize initrd addresses. For example firmware
198 * can't guess if they need to pass them through
199 * 64-bits values if the kernel has been built in pure
200 * 32-bit. We need also to switch from KSEG0 to XKPHYS
201 * addresses now, so the code can now safely use __pa().
202 */
203 end = __pa(initrd_end);
204 initrd_end = (unsigned long)__va(end);
205 initrd_start = (unsigned long)__va(__pa(initrd_start));
206
207 if (initrd_start < PAGE_OFFSET) {
208 pr_err("initrd start < PAGE_OFFSET\n");
209 goto disable;
210 }
211
212 ROOT_DEV = Root_RAM0;
213 return PFN_UP(end);
214 disable:
215 initrd_start = 0;
216 initrd_end = 0;
217 return 0;
218 }
219
220 /* In some conditions (e.g. big endian bootloader with a little endian
221 kernel), the initrd might appear byte swapped. Try to detect this and
222 byte swap it if needed. */
maybe_bswap_initrd(void)223 static void __init maybe_bswap_initrd(void)
224 {
225 #if defined(CONFIG_CPU_CAVIUM_OCTEON)
226 u64 buf;
227
228 /* Check for CPIO signature */
229 if (!memcmp((void *)initrd_start, "070701", 6))
230 return;
231
232 /* Check for compressed initrd */
233 if (decompress_method((unsigned char *)initrd_start, 8, NULL))
234 return;
235
236 /* Try again with a byte swapped header */
237 buf = swab64p((u64 *)initrd_start);
238 if (!memcmp(&buf, "070701", 6) ||
239 decompress_method((unsigned char *)(&buf), 8, NULL)) {
240 unsigned long i;
241
242 pr_info("Byteswapped initrd detected\n");
243 for (i = initrd_start; i < ALIGN(initrd_end, 8); i += 8)
244 swab64s((u64 *)i);
245 }
246 #endif
247 }
248
finalize_initrd(void)249 static void __init finalize_initrd(void)
250 {
251 unsigned long size = initrd_end - initrd_start;
252
253 if (size == 0) {
254 printk(KERN_INFO "Initrd not found or empty");
255 goto disable;
256 }
257 if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
258 printk(KERN_ERR "Initrd extends beyond end of memory");
259 goto disable;
260 }
261
262 maybe_bswap_initrd();
263
264 memblock_reserve(__pa(initrd_start), size);
265 initrd_below_start_ok = 1;
266
267 pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",
268 initrd_start, size);
269 return;
270 disable:
271 printk(KERN_CONT " - disabling initrd\n");
272 initrd_start = 0;
273 initrd_end = 0;
274 }
275
276 #else /* !CONFIG_BLK_DEV_INITRD */
277
init_initrd(void)278 static unsigned long __init init_initrd(void)
279 {
280 return 0;
281 }
282
283 #define finalize_initrd() do {} while (0)
284
285 #endif
286
287 /*
288 * Initialize the bootmem allocator. It also setup initrd related data
289 * if needed.
290 */
291 #if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON3) && defined(CONFIG_NUMA))
292
bootmem_init(void)293 static void __init bootmem_init(void)
294 {
295 init_initrd();
296 finalize_initrd();
297 }
298
299 #else /* !CONFIG_SGI_IP27 */
300
bootmem_init(void)301 static void __init bootmem_init(void)
302 {
303 struct memblock_region *mem;
304 phys_addr_t ramstart, ramend;
305
306 ramstart = memblock_start_of_DRAM();
307 ramend = memblock_end_of_DRAM();
308
309 /*
310 * Sanity check any INITRD first. We don't take it into account
311 * for bootmem setup initially, rely on the end-of-kernel-code
312 * as our memory range starting point. Once bootmem is inited we
313 * will reserve the area used for the initrd.
314 */
315 init_initrd();
316
317 /* Reserve memory occupied by kernel. */
318 memblock_reserve(__pa_symbol(&_text),
319 __pa_symbol(&_end) - __pa_symbol(&_text));
320
321 /* max_low_pfn is not a number of pages but the end pfn of low mem */
322
323 #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET
324 ARCH_PFN_OFFSET = PFN_UP(ramstart);
325 #else
326 /*
327 * Reserve any memory between the start of RAM and PHYS_OFFSET
328 */
329 if (ramstart > PHYS_OFFSET)
330 memblock_reserve(PHYS_OFFSET, ramstart - PHYS_OFFSET);
331
332 if (PFN_UP(ramstart) > ARCH_PFN_OFFSET) {
333 pr_info("Wasting %lu bytes for tracking %lu unused pages\n",
334 (unsigned long)((PFN_UP(ramstart) - ARCH_PFN_OFFSET) * sizeof(struct page)),
335 (unsigned long)(PFN_UP(ramstart) - ARCH_PFN_OFFSET));
336 }
337 #endif
338
339 min_low_pfn = ARCH_PFN_OFFSET;
340 max_pfn = PFN_DOWN(ramend);
341 for_each_memblock(memory, mem) {
342 unsigned long start = memblock_region_memory_base_pfn(mem);
343 unsigned long end = memblock_region_memory_end_pfn(mem);
344
345 /*
346 * Skip highmem here so we get an accurate max_low_pfn if low
347 * memory stops short of high memory.
348 * If the region overlaps HIGHMEM_START, end is clipped so
349 * max_pfn excludes the highmem portion.
350 */
351 if (memblock_is_nomap(mem))
352 continue;
353 if (start >= PFN_DOWN(HIGHMEM_START))
354 continue;
355 if (end > PFN_DOWN(HIGHMEM_START))
356 end = PFN_DOWN(HIGHMEM_START);
357 if (end > max_low_pfn)
358 max_low_pfn = end;
359 }
360
361 if (min_low_pfn >= max_low_pfn)
362 panic("Incorrect memory mapping !!!");
363
364 if (max_pfn > PFN_DOWN(HIGHMEM_START)) {
365 max_low_pfn = PFN_DOWN(HIGHMEM_START);
366 #ifdef CONFIG_HIGHMEM
367 highstart_pfn = max_low_pfn;
368 highend_pfn = max_pfn;
369 #else
370 max_pfn = max_low_pfn;
371 #endif
372 }
373
374
375 /*
376 * In any case the added to the memblock memory regions
377 * (highmem/lowmem, available/reserved, etc) are considered
378 * as present, so inform sparsemem about them.
379 */
380 memblocks_present();
381
382 /*
383 * Reserve initrd memory if needed.
384 */
385 finalize_initrd();
386 }
387
388 #endif /* CONFIG_SGI_IP27 */
389
390 static int usermem __initdata;
391
early_parse_mem(char * p)392 static int __init early_parse_mem(char *p)
393 {
394 phys_addr_t start, size;
395
396 /*
397 * If a user specifies memory size, we
398 * blow away any automatically generated
399 * size.
400 */
401 if (usermem == 0) {
402 usermem = 1;
403 memblock_remove(memblock_start_of_DRAM(),
404 memblock_end_of_DRAM() - memblock_start_of_DRAM());
405 }
406 start = 0;
407 size = memparse(p, &p);
408 if (*p == '@')
409 start = memparse(p + 1, &p);
410
411 add_memory_region(start, size, BOOT_MEM_RAM);
412
413 return 0;
414 }
415 early_param("mem", early_parse_mem);
416
early_parse_memmap(char * p)417 static int __init early_parse_memmap(char *p)
418 {
419 char *oldp;
420 u64 start_at, mem_size;
421
422 if (!p)
423 return -EINVAL;
424
425 if (!strncmp(p, "exactmap", 8)) {
426 pr_err("\"memmap=exactmap\" invalid on MIPS\n");
427 return 0;
428 }
429
430 oldp = p;
431 mem_size = memparse(p, &p);
432 if (p == oldp)
433 return -EINVAL;
434
435 if (*p == '@') {
436 start_at = memparse(p+1, &p);
437 add_memory_region(start_at, mem_size, BOOT_MEM_RAM);
438 } else if (*p == '#') {
439 pr_err("\"memmap=nn#ss\" (force ACPI data) invalid on MIPS\n");
440 return -EINVAL;
441 } else if (*p == '$') {
442 start_at = memparse(p+1, &p);
443 add_memory_region(start_at, mem_size, BOOT_MEM_RESERVED);
444 } else {
445 pr_err("\"memmap\" invalid format!\n");
446 return -EINVAL;
447 }
448
449 if (*p == '\0') {
450 usermem = 1;
451 return 0;
452 } else
453 return -EINVAL;
454 }
455 early_param("memmap", early_parse_memmap);
456
457 #ifdef CONFIG_PROC_VMCORE
458 unsigned long setup_elfcorehdr, setup_elfcorehdr_size;
early_parse_elfcorehdr(char * p)459 static int __init early_parse_elfcorehdr(char *p)
460 {
461 struct memblock_region *mem;
462
463 setup_elfcorehdr = memparse(p, &p);
464
465 for_each_memblock(memory, mem) {
466 unsigned long start = mem->base;
467 unsigned long end = start + mem->size;
468 if (setup_elfcorehdr >= start && setup_elfcorehdr < end) {
469 /*
470 * Reserve from the elf core header to the end of
471 * the memory segment, that should all be kdump
472 * reserved memory.
473 */
474 setup_elfcorehdr_size = end - setup_elfcorehdr;
475 break;
476 }
477 }
478 /*
479 * If we don't find it in the memory map, then we shouldn't
480 * have to worry about it, as the new kernel won't use it.
481 */
482 return 0;
483 }
484 early_param("elfcorehdr", early_parse_elfcorehdr);
485 #endif
486
487 #ifdef CONFIG_KEXEC
mips_parse_crashkernel(void)488 static void __init mips_parse_crashkernel(void)
489 {
490 unsigned long long total_mem;
491 unsigned long long crash_size, crash_base;
492 int ret;
493
494 total_mem = memblock_phys_mem_size();
495 ret = parse_crashkernel(boot_command_line, total_mem,
496 &crash_size, &crash_base);
497 if (ret != 0 || crash_size <= 0)
498 return;
499
500 if (!memblock_find_in_range(crash_base, crash_base + crash_size, crash_size, 1)) {
501 pr_warn("Invalid memory region reserved for crash kernel\n");
502 return;
503 }
504
505 crashk_res.start = crash_base;
506 crashk_res.end = crash_base + crash_size - 1;
507 }
508
request_crashkernel(struct resource * res)509 static void __init request_crashkernel(struct resource *res)
510 {
511 int ret;
512
513 if (crashk_res.start == crashk_res.end)
514 return;
515
516 ret = request_resource(res, &crashk_res);
517 if (!ret)
518 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",
519 (unsigned long)((crashk_res.end -
520 crashk_res.start + 1) >> 20),
521 (unsigned long)(crashk_res.start >> 20));
522 }
523 #else /* !defined(CONFIG_KEXEC) */
mips_parse_crashkernel(void)524 static void __init mips_parse_crashkernel(void)
525 {
526 }
527
request_crashkernel(struct resource * res)528 static void __init request_crashkernel(struct resource *res)
529 {
530 }
531 #endif /* !defined(CONFIG_KEXEC) */
532
check_kernel_sections_mem(void)533 static void __init check_kernel_sections_mem(void)
534 {
535 phys_addr_t start = __pa_symbol(&_text);
536 phys_addr_t size = __pa_symbol(&_end) - start;
537
538 if (!memblock_is_region_memory(start, size)) {
539 pr_info("Kernel sections are not in the memory maps\n");
540 memblock_add(start, size);
541 }
542 }
543
544 #define USE_PROM_CMDLINE IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_BOOTLOADER)
545 #define USE_DTB_CMDLINE IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_DTB)
546 #define EXTEND_WITH_PROM IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND)
547 #define BUILTIN_EXTEND_WITH_PROM \
548 IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND)
549
550 /*
551 * arch_mem_init - initialize memory management subsystem
552 *
553 * o plat_mem_setup() detects the memory configuration and will record detected
554 * memory areas using add_memory_region.
555 *
556 * At this stage the memory configuration of the system is known to the
557 * kernel but generic memory management system is still entirely uninitialized.
558 *
559 * o bootmem_init()
560 * o sparse_init()
561 * o paging_init()
562 * o dma_contiguous_reserve()
563 *
564 * At this stage the bootmem allocator is ready to use.
565 *
566 * NOTE: historically plat_mem_setup did the entire platform initialization.
567 * This was rather impractical because it meant plat_mem_setup had to
568 * get away without any kind of memory allocator. To keep old code from
569 * breaking plat_setup was just renamed to plat_mem_setup and a second platform
570 * initialization hook for anything else was introduced.
571 */
arch_mem_init(char ** cmdline_p)572 static void __init arch_mem_init(char **cmdline_p)
573 {
574 extern void plat_mem_setup(void);
575
576 /*
577 * Initialize boot_command_line to an innocuous but non-empty string in
578 * order to prevent early_init_dt_scan_chosen() from copying
579 * CONFIG_CMDLINE into it without our knowledge. We handle
580 * CONFIG_CMDLINE ourselves below & don't want to duplicate its
581 * content because repeating arguments can be problematic.
582 */
583 strlcpy(boot_command_line, " ", COMMAND_LINE_SIZE);
584
585 /* call board setup routine */
586 plat_mem_setup();
587 memblock_set_bottom_up(true);
588
589 #if defined(CONFIG_CMDLINE_BOOL) && defined(CONFIG_CMDLINE_OVERRIDE)
590 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
591 #else
592 if ((USE_PROM_CMDLINE && arcs_cmdline[0]) ||
593 (USE_DTB_CMDLINE && !boot_command_line[0]))
594 strlcpy(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
595
596 if (EXTEND_WITH_PROM && arcs_cmdline[0]) {
597 if (boot_command_line[0])
598 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
599 strlcat(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
600 }
601
602 #if defined(CONFIG_CMDLINE_BOOL)
603 if (builtin_cmdline[0]) {
604 if (boot_command_line[0])
605 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
606 strlcat(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
607 }
608
609 if (BUILTIN_EXTEND_WITH_PROM && arcs_cmdline[0]) {
610 if (boot_command_line[0])
611 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
612 strlcat(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
613 }
614 #endif
615 #endif
616 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
617
618 *cmdline_p = command_line;
619
620 parse_early_param();
621
622 if (usermem)
623 pr_info("User-defined physical RAM map overwrite\n");
624
625 check_kernel_sections_mem();
626
627 early_init_fdt_reserve_self();
628 early_init_fdt_scan_reserved_mem();
629
630 #ifndef CONFIG_NUMA
631 memblock_set_node(0, PHYS_ADDR_MAX, &memblock.memory, 0);
632 #endif
633 bootmem_init();
634
635 /*
636 * Prevent memblock from allocating high memory.
637 * This cannot be done before max_low_pfn is detected, so up
638 * to this point is possible to only reserve physical memory
639 * with memblock_reserve; memblock_alloc* can be used
640 * only after this point
641 */
642 memblock_set_current_limit(PFN_PHYS(max_low_pfn));
643
644 #ifdef CONFIG_PROC_VMCORE
645 if (setup_elfcorehdr && setup_elfcorehdr_size) {
646 printk(KERN_INFO "kdump reserved memory at %lx-%lx\n",
647 setup_elfcorehdr, setup_elfcorehdr_size);
648 memblock_reserve(setup_elfcorehdr, setup_elfcorehdr_size);
649 }
650 #endif
651
652 mips_parse_crashkernel();
653 #ifdef CONFIG_KEXEC
654 if (crashk_res.start != crashk_res.end)
655 memblock_reserve(crashk_res.start,
656 crashk_res.end - crashk_res.start + 1);
657 #endif
658 device_tree_init();
659
660 /*
661 * In order to reduce the possibility of kernel panic when failed to
662 * get IO TLB memory under CONFIG_SWIOTLB, it is better to allocate
663 * low memory as small as possible before plat_swiotlb_setup(), so
664 * make sparse_init() using top-down allocation.
665 */
666 memblock_set_bottom_up(false);
667 sparse_init();
668 memblock_set_bottom_up(true);
669
670 plat_swiotlb_setup();
671
672 dma_contiguous_reserve(PFN_PHYS(max_low_pfn));
673
674 /* Reserve for hibernation. */
675 memblock_reserve(__pa_symbol(&__nosave_begin),
676 __pa_symbol(&__nosave_end) - __pa_symbol(&__nosave_begin));
677
678 fdt_init_reserved_mem();
679
680 memblock_dump_all();
681
682 early_memtest(PFN_PHYS(ARCH_PFN_OFFSET), PFN_PHYS(max_low_pfn));
683 }
684
resource_init(void)685 static void __init resource_init(void)
686 {
687 struct memblock_region *region;
688
689 if (UNCAC_BASE != IO_BASE)
690 return;
691
692 code_resource.start = __pa_symbol(&_text);
693 code_resource.end = __pa_symbol(&_etext) - 1;
694 data_resource.start = __pa_symbol(&_etext);
695 data_resource.end = __pa_symbol(&_edata) - 1;
696 bss_resource.start = __pa_symbol(&__bss_start);
697 bss_resource.end = __pa_symbol(&__bss_stop) - 1;
698
699 for_each_memblock(memory, region) {
700 phys_addr_t start = PFN_PHYS(memblock_region_memory_base_pfn(region));
701 phys_addr_t end = PFN_PHYS(memblock_region_memory_end_pfn(region)) - 1;
702 struct resource *res;
703
704 res = memblock_alloc(sizeof(struct resource), SMP_CACHE_BYTES);
705 if (!res)
706 panic("%s: Failed to allocate %zu bytes\n", __func__,
707 sizeof(struct resource));
708
709 res->start = start;
710 res->end = end;
711 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
712 res->name = "System RAM";
713
714 request_resource(&iomem_resource, res);
715
716 /*
717 * We don't know which RAM region contains kernel data,
718 * so we try it repeatedly and let the resource manager
719 * test it.
720 */
721 request_resource(res, &code_resource);
722 request_resource(res, &data_resource);
723 request_resource(res, &bss_resource);
724 request_crashkernel(res);
725 }
726 }
727
728 #ifdef CONFIG_SMP
prefill_possible_map(void)729 static void __init prefill_possible_map(void)
730 {
731 int i, possible = num_possible_cpus();
732
733 if (possible > nr_cpu_ids)
734 possible = nr_cpu_ids;
735
736 for (i = 0; i < possible; i++)
737 set_cpu_possible(i, true);
738 for (; i < NR_CPUS; i++)
739 set_cpu_possible(i, false);
740
741 nr_cpu_ids = possible;
742 }
743 #else
prefill_possible_map(void)744 static inline void prefill_possible_map(void) {}
745 #endif
746
setup_arch(char ** cmdline_p)747 void __init setup_arch(char **cmdline_p)
748 {
749 cpu_probe();
750 mips_cm_probe();
751 prom_init();
752
753 setup_early_fdc_console();
754 #ifdef CONFIG_EARLY_PRINTK
755 setup_early_printk();
756 #endif
757 cpu_report();
758 check_bugs_early();
759
760 #if defined(CONFIG_VT)
761 #if defined(CONFIG_VGA_CONSOLE)
762 conswitchp = &vga_con;
763 #elif defined(CONFIG_DUMMY_CONSOLE)
764 conswitchp = &dummy_con;
765 #endif
766 #endif
767
768 arch_mem_init(cmdline_p);
769
770 resource_init();
771 plat_smp_setup();
772 prefill_possible_map();
773
774 cpu_cache_init();
775 paging_init();
776 }
777
778 unsigned long kernelsp[NR_CPUS];
779 unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
780
781 #ifdef CONFIG_USE_OF
782 unsigned long fw_passed_dtb;
783 #endif
784
785 #ifdef CONFIG_DEBUG_FS
786 struct dentry *mips_debugfs_dir;
debugfs_mips(void)787 static int __init debugfs_mips(void)
788 {
789 mips_debugfs_dir = debugfs_create_dir("mips", NULL);
790 return 0;
791 }
792 arch_initcall(debugfs_mips);
793 #endif
794
795 #ifdef CONFIG_DMA_MAYBE_COHERENT
796 /* User defined DMA coherency from command line. */
797 enum coherent_io_user_state coherentio = IO_COHERENCE_DEFAULT;
798 EXPORT_SYMBOL_GPL(coherentio);
799 int hw_coherentio = 0; /* Actual hardware supported DMA coherency setting. */
800
setcoherentio(char * str)801 static int __init setcoherentio(char *str)
802 {
803 coherentio = IO_COHERENCE_ENABLED;
804 pr_info("Hardware DMA cache coherency (command line)\n");
805 return 0;
806 }
807 early_param("coherentio", setcoherentio);
808
setnocoherentio(char * str)809 static int __init setnocoherentio(char *str)
810 {
811 coherentio = IO_COHERENCE_DISABLED;
812 pr_info("Software DMA cache coherency (command line)\n");
813 return 0;
814 }
815 early_param("nocoherentio", setnocoherentio);
816 #endif
817
arch_cpu_finalize_init(void)818 void __init arch_cpu_finalize_init(void)
819 {
820 unsigned int cpu = smp_processor_id();
821
822 cpu_data[cpu].udelay_val = loops_per_jiffy;
823 check_bugs32();
824
825 if (IS_ENABLED(CONFIG_CPU_R4X00_BUGS64))
826 check_bugs64();
827 }
828