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-map-ops.h>
30 #include <linux/decompress/generic.h>
31 #include <linux/of_fdt.h>
32 #include <linux/dmi.h>
33 #include <linux/crash_dump.h>
34
35 #include <asm/addrspace.h>
36 #include <asm/bootinfo.h>
37 #include <asm/bugs.h>
38 #include <asm/cache.h>
39 #include <asm/cdmm.h>
40 #include <asm/cpu.h>
41 #include <asm/debug.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 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 const char builtin_cmdline[] __initconst = CONFIG_CMDLINE;
73 #else
74 static const char builtin_cmdline[] __initconst = "";
75 #endif
76
77 /*
78 * mips_io_port_base is the begin of the address space to which x86 style
79 * I/O ports are mapped.
80 */
81 unsigned long mips_io_port_base = -1;
82 EXPORT_SYMBOL(mips_io_port_base);
83
84 static struct resource code_resource = { .name = "Kernel code", };
85 static struct resource data_resource = { .name = "Kernel data", };
86 static struct resource bss_resource = { .name = "Kernel bss", };
87
88 unsigned long __kaslr_offset __ro_after_init;
89 EXPORT_SYMBOL(__kaslr_offset);
90
91 static void *detect_magic __initdata = detect_memory_region;
92
93 #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET
94 unsigned long ARCH_PFN_OFFSET;
95 EXPORT_SYMBOL(ARCH_PFN_OFFSET);
96 #endif
97
detect_memory_region(phys_addr_t start,phys_addr_t sz_min,phys_addr_t sz_max)98 void __init detect_memory_region(phys_addr_t start, phys_addr_t sz_min, phys_addr_t sz_max)
99 {
100 void *dm = &detect_magic;
101 phys_addr_t size;
102
103 for (size = sz_min; size < sz_max; size <<= 1) {
104 if (!memcmp(dm, dm + size, sizeof(detect_magic)))
105 break;
106 }
107
108 pr_debug("Memory: %lluMB of RAM detected at 0x%llx (min: %lluMB, max: %lluMB)\n",
109 ((unsigned long long) size) / SZ_1M,
110 (unsigned long long) start,
111 ((unsigned long long) sz_min) / SZ_1M,
112 ((unsigned long long) sz_max) / SZ_1M);
113
114 memblock_add(start, size);
115 }
116
117 /*
118 * Manage initrd
119 */
120 #ifdef CONFIG_BLK_DEV_INITRD
121
rd_start_early(char * p)122 static int __init rd_start_early(char *p)
123 {
124 unsigned long start = memparse(p, &p);
125
126 #ifdef CONFIG_64BIT
127 /* Guess if the sign extension was forgotten by bootloader */
128 if (start < XKPHYS)
129 start = (int)start;
130 #endif
131 initrd_start = start;
132 initrd_end += start;
133 return 0;
134 }
135 early_param("rd_start", rd_start_early);
136
rd_size_early(char * p)137 static int __init rd_size_early(char *p)
138 {
139 initrd_end += memparse(p, &p);
140 return 0;
141 }
142 early_param("rd_size", rd_size_early);
143
144 /* it returns the next free pfn after initrd */
init_initrd(void)145 static unsigned long __init init_initrd(void)
146 {
147 unsigned long end;
148
149 /*
150 * Board specific code or command line parser should have
151 * already set up initrd_start and initrd_end. In these cases
152 * perfom sanity checks and use them if all looks good.
153 */
154 if (!initrd_start || initrd_end <= initrd_start)
155 goto disable;
156
157 if (initrd_start & ~PAGE_MASK) {
158 pr_err("initrd start must be page aligned\n");
159 goto disable;
160 }
161
162 /*
163 * Sanitize initrd addresses. For example firmware
164 * can't guess if they need to pass them through
165 * 64-bits values if the kernel has been built in pure
166 * 32-bit. We need also to switch from KSEG0 to XKPHYS
167 * addresses now, so the code can now safely use __pa().
168 */
169 end = __pa(initrd_end);
170 initrd_end = (unsigned long)__va(end);
171 initrd_start = (unsigned long)__va(__pa(initrd_start));
172
173 if (initrd_start < PAGE_OFFSET) {
174 pr_err("initrd start < PAGE_OFFSET\n");
175 goto disable;
176 }
177
178 ROOT_DEV = Root_RAM0;
179 return PFN_UP(end);
180 disable:
181 initrd_start = 0;
182 initrd_end = 0;
183 return 0;
184 }
185
186 /* In some conditions (e.g. big endian bootloader with a little endian
187 kernel), the initrd might appear byte swapped. Try to detect this and
188 byte swap it if needed. */
maybe_bswap_initrd(void)189 static void __init maybe_bswap_initrd(void)
190 {
191 #if defined(CONFIG_CPU_CAVIUM_OCTEON)
192 u64 buf;
193
194 /* Check for CPIO signature */
195 if (!memcmp((void *)initrd_start, "070701", 6))
196 return;
197
198 /* Check for compressed initrd */
199 if (decompress_method((unsigned char *)initrd_start, 8, NULL))
200 return;
201
202 /* Try again with a byte swapped header */
203 buf = swab64p((u64 *)initrd_start);
204 if (!memcmp(&buf, "070701", 6) ||
205 decompress_method((unsigned char *)(&buf), 8, NULL)) {
206 unsigned long i;
207
208 pr_info("Byteswapped initrd detected\n");
209 for (i = initrd_start; i < ALIGN(initrd_end, 8); i += 8)
210 swab64s((u64 *)i);
211 }
212 #endif
213 }
214
finalize_initrd(void)215 static void __init finalize_initrd(void)
216 {
217 unsigned long size = initrd_end - initrd_start;
218
219 if (size == 0) {
220 printk(KERN_INFO "Initrd not found or empty");
221 goto disable;
222 }
223 if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
224 printk(KERN_ERR "Initrd extends beyond end of memory");
225 goto disable;
226 }
227
228 maybe_bswap_initrd();
229
230 memblock_reserve(__pa(initrd_start), size);
231 initrd_below_start_ok = 1;
232
233 pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",
234 initrd_start, size);
235 return;
236 disable:
237 printk(KERN_CONT " - disabling initrd\n");
238 initrd_start = 0;
239 initrd_end = 0;
240 }
241
242 #else /* !CONFIG_BLK_DEV_INITRD */
243
init_initrd(void)244 static unsigned long __init init_initrd(void)
245 {
246 return 0;
247 }
248
249 #define finalize_initrd() do {} while (0)
250
251 #endif
252
253 /*
254 * Initialize the bootmem allocator. It also setup initrd related data
255 * if needed.
256 */
257 #if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON64) && defined(CONFIG_NUMA))
258
bootmem_init(void)259 static void __init bootmem_init(void)
260 {
261 init_initrd();
262 finalize_initrd();
263 }
264
265 #else /* !CONFIG_SGI_IP27 */
266
bootmem_init(void)267 static void __init bootmem_init(void)
268 {
269 phys_addr_t ramstart, ramend;
270 unsigned long start, end;
271 int i;
272
273 ramstart = memblock_start_of_DRAM();
274 ramend = memblock_end_of_DRAM();
275
276 /*
277 * Sanity check any INITRD first. We don't take it into account
278 * for bootmem setup initially, rely on the end-of-kernel-code
279 * as our memory range starting point. Once bootmem is inited we
280 * will reserve the area used for the initrd.
281 */
282 init_initrd();
283
284 /* Reserve memory occupied by kernel. */
285 memblock_reserve(__pa_symbol(&_text),
286 __pa_symbol(&_end) - __pa_symbol(&_text));
287
288 /* max_low_pfn is not a number of pages but the end pfn of low mem */
289
290 #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET
291 ARCH_PFN_OFFSET = PFN_UP(ramstart);
292 #else
293 /*
294 * Reserve any memory between the start of RAM and PHYS_OFFSET
295 */
296 if (ramstart > PHYS_OFFSET)
297 memblock_reserve(PHYS_OFFSET, ramstart - PHYS_OFFSET);
298
299 if (PFN_UP(ramstart) > ARCH_PFN_OFFSET) {
300 pr_info("Wasting %lu bytes for tracking %lu unused pages\n",
301 (unsigned long)((PFN_UP(ramstart) - ARCH_PFN_OFFSET) * sizeof(struct page)),
302 (unsigned long)(PFN_UP(ramstart) - ARCH_PFN_OFFSET));
303 }
304 #endif
305
306 min_low_pfn = ARCH_PFN_OFFSET;
307 max_pfn = PFN_DOWN(ramend);
308 for_each_mem_pfn_range(i, MAX_NUMNODES, &start, &end, NULL) {
309 /*
310 * Skip highmem here so we get an accurate max_low_pfn if low
311 * memory stops short of high memory.
312 * If the region overlaps HIGHMEM_START, end is clipped so
313 * max_pfn excludes the highmem portion.
314 */
315 if (start >= PFN_DOWN(HIGHMEM_START))
316 continue;
317 if (end > PFN_DOWN(HIGHMEM_START))
318 end = PFN_DOWN(HIGHMEM_START);
319 if (end > max_low_pfn)
320 max_low_pfn = end;
321 }
322
323 if (min_low_pfn >= max_low_pfn)
324 panic("Incorrect memory mapping !!!");
325
326 if (max_pfn > PFN_DOWN(HIGHMEM_START)) {
327 max_low_pfn = PFN_DOWN(HIGHMEM_START);
328 #ifdef CONFIG_HIGHMEM
329 highstart_pfn = max_low_pfn;
330 highend_pfn = max_pfn;
331 #else
332 max_pfn = max_low_pfn;
333 #endif
334 }
335
336 /*
337 * Reserve initrd memory if needed.
338 */
339 finalize_initrd();
340 }
341
342 #endif /* CONFIG_SGI_IP27 */
343
344 static int usermem __initdata;
345
early_parse_mem(char * p)346 static int __init early_parse_mem(char *p)
347 {
348 phys_addr_t start, size;
349
350 /*
351 * If a user specifies memory size, we
352 * blow away any automatically generated
353 * size.
354 */
355 if (usermem == 0) {
356 usermem = 1;
357 memblock_remove(memblock_start_of_DRAM(),
358 memblock_end_of_DRAM() - memblock_start_of_DRAM());
359 }
360 start = 0;
361 size = memparse(p, &p);
362 if (*p == '@')
363 start = memparse(p + 1, &p);
364
365 memblock_add(start, size);
366
367 return 0;
368 }
369 early_param("mem", early_parse_mem);
370
early_parse_memmap(char * p)371 static int __init early_parse_memmap(char *p)
372 {
373 char *oldp;
374 u64 start_at, mem_size;
375
376 if (!p)
377 return -EINVAL;
378
379 if (!strncmp(p, "exactmap", 8)) {
380 pr_err("\"memmap=exactmap\" invalid on MIPS\n");
381 return 0;
382 }
383
384 oldp = p;
385 mem_size = memparse(p, &p);
386 if (p == oldp)
387 return -EINVAL;
388
389 if (*p == '@') {
390 start_at = memparse(p+1, &p);
391 memblock_add(start_at, mem_size);
392 } else if (*p == '#') {
393 pr_err("\"memmap=nn#ss\" (force ACPI data) invalid on MIPS\n");
394 return -EINVAL;
395 } else if (*p == '$') {
396 start_at = memparse(p+1, &p);
397 memblock_add(start_at, mem_size);
398 memblock_reserve(start_at, mem_size);
399 } else {
400 pr_err("\"memmap\" invalid format!\n");
401 return -EINVAL;
402 }
403
404 if (*p == '\0') {
405 usermem = 1;
406 return 0;
407 } else
408 return -EINVAL;
409 }
410 early_param("memmap", early_parse_memmap);
411
mips_reserve_vmcore(void)412 static void __init mips_reserve_vmcore(void)
413 {
414 #ifdef CONFIG_PROC_VMCORE
415 phys_addr_t start, end;
416 u64 i;
417
418 if (!elfcorehdr_size) {
419 for_each_mem_range(i, &start, &end) {
420 if (elfcorehdr_addr >= start && elfcorehdr_addr < end) {
421 /*
422 * Reserve from the elf core header to the end of
423 * the memory segment, that should all be kdump
424 * reserved memory.
425 */
426 elfcorehdr_size = end - elfcorehdr_addr;
427 break;
428 }
429 }
430 }
431
432 pr_info("Reserving %ldKB of memory at %ldKB for kdump\n",
433 (unsigned long)elfcorehdr_size >> 10, (unsigned long)elfcorehdr_addr >> 10);
434
435 memblock_reserve(elfcorehdr_addr, elfcorehdr_size);
436 #endif
437 }
438
439 #ifdef CONFIG_KEXEC
440
441 /* 64M alignment for crash kernel regions */
442 #define CRASH_ALIGN SZ_64M
443 #define CRASH_ADDR_MAX SZ_512M
444
mips_parse_crashkernel(void)445 static void __init mips_parse_crashkernel(void)
446 {
447 unsigned long long total_mem;
448 unsigned long long crash_size, crash_base;
449 int ret;
450
451 total_mem = memblock_phys_mem_size();
452 ret = parse_crashkernel(boot_command_line, total_mem,
453 &crash_size, &crash_base);
454 if (ret != 0 || crash_size <= 0)
455 return;
456
457 if (crash_base <= 0) {
458 crash_base = memblock_phys_alloc_range(crash_size, CRASH_ALIGN,
459 CRASH_ALIGN,
460 CRASH_ADDR_MAX);
461 if (!crash_base) {
462 pr_warn("crashkernel reservation failed - No suitable area found.\n");
463 return;
464 }
465 } else {
466 unsigned long long start;
467
468 start = memblock_phys_alloc_range(crash_size, 1,
469 crash_base,
470 crash_base + crash_size);
471 if (start != crash_base) {
472 pr_warn("Invalid memory region reserved for crash kernel\n");
473 return;
474 }
475 }
476
477 crashk_res.start = crash_base;
478 crashk_res.end = crash_base + crash_size - 1;
479 }
480
request_crashkernel(struct resource * res)481 static void __init request_crashkernel(struct resource *res)
482 {
483 int ret;
484
485 if (crashk_res.start == crashk_res.end)
486 return;
487
488 ret = request_resource(res, &crashk_res);
489 if (!ret)
490 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",
491 (unsigned long)(resource_size(&crashk_res) >> 20),
492 (unsigned long)(crashk_res.start >> 20));
493 }
494 #else /* !defined(CONFIG_KEXEC) */
mips_parse_crashkernel(void)495 static void __init mips_parse_crashkernel(void)
496 {
497 }
498
request_crashkernel(struct resource * res)499 static void __init request_crashkernel(struct resource *res)
500 {
501 }
502 #endif /* !defined(CONFIG_KEXEC) */
503
check_kernel_sections_mem(void)504 static void __init check_kernel_sections_mem(void)
505 {
506 phys_addr_t start = __pa_symbol(&_text);
507 phys_addr_t size = __pa_symbol(&_end) - start;
508
509 if (!memblock_is_region_memory(start, size)) {
510 pr_info("Kernel sections are not in the memory maps\n");
511 memblock_add(start, size);
512 }
513 }
514
bootcmdline_append(const char * s,size_t max)515 static void __init bootcmdline_append(const char *s, size_t max)
516 {
517 if (!s[0] || !max)
518 return;
519
520 if (boot_command_line[0])
521 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
522
523 strlcat(boot_command_line, s, max);
524 }
525
526 #ifdef CONFIG_OF_EARLY_FLATTREE
527
bootcmdline_scan_chosen(unsigned long node,const char * uname,int depth,void * data)528 static int __init bootcmdline_scan_chosen(unsigned long node, const char *uname,
529 int depth, void *data)
530 {
531 bool *dt_bootargs = data;
532 const char *p;
533 int l;
534
535 if (depth != 1 || !data ||
536 (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0))
537 return 0;
538
539 p = of_get_flat_dt_prop(node, "bootargs", &l);
540 if (p != NULL && l > 0) {
541 bootcmdline_append(p, min(l, COMMAND_LINE_SIZE));
542 *dt_bootargs = true;
543 }
544
545 return 1;
546 }
547
548 #endif /* CONFIG_OF_EARLY_FLATTREE */
549
bootcmdline_init(void)550 static void __init bootcmdline_init(void)
551 {
552 bool dt_bootargs = false;
553
554 /*
555 * If CMDLINE_OVERRIDE is enabled then initializing the command line is
556 * trivial - we simply use the built-in command line unconditionally &
557 * unmodified.
558 */
559 if (IS_ENABLED(CONFIG_CMDLINE_OVERRIDE)) {
560 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
561 return;
562 }
563
564 /*
565 * If the user specified a built-in command line &
566 * MIPS_CMDLINE_BUILTIN_EXTEND, then the built-in command line is
567 * prepended to arguments from the bootloader or DT so we'll copy them
568 * to the start of boot_command_line here. Otherwise, empty
569 * boot_command_line to undo anything early_init_dt_scan_chosen() did.
570 */
571 if (IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND))
572 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
573 else
574 boot_command_line[0] = 0;
575
576 #ifdef CONFIG_OF_EARLY_FLATTREE
577 /*
578 * If we're configured to take boot arguments from DT, look for those
579 * now.
580 */
581 if (IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_DTB) ||
582 IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND))
583 of_scan_flat_dt(bootcmdline_scan_chosen, &dt_bootargs);
584 #endif
585
586 /*
587 * If we didn't get any arguments from DT (regardless of whether that's
588 * because we weren't configured to look for them, or because we looked
589 * & found none) then we'll take arguments from the bootloader.
590 * plat_mem_setup() should have filled arcs_cmdline with arguments from
591 * the bootloader.
592 */
593 if (IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND) || !dt_bootargs)
594 bootcmdline_append(arcs_cmdline, COMMAND_LINE_SIZE);
595
596 /*
597 * If the user specified a built-in command line & we didn't already
598 * prepend it, we append it to boot_command_line here.
599 */
600 if (IS_ENABLED(CONFIG_CMDLINE_BOOL) &&
601 !IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND))
602 bootcmdline_append(builtin_cmdline, COMMAND_LINE_SIZE);
603 }
604
605 /*
606 * arch_mem_init - initialize memory management subsystem
607 *
608 * o plat_mem_setup() detects the memory configuration and will record detected
609 * memory areas using memblock_add.
610 *
611 * At this stage the memory configuration of the system is known to the
612 * kernel but generic memory management system is still entirely uninitialized.
613 *
614 * o bootmem_init()
615 * o sparse_init()
616 * o paging_init()
617 * o dma_contiguous_reserve()
618 *
619 * At this stage the bootmem allocator is ready to use.
620 *
621 * NOTE: historically plat_mem_setup did the entire platform initialization.
622 * This was rather impractical because it meant plat_mem_setup had to
623 * get away without any kind of memory allocator. To keep old code from
624 * breaking plat_setup was just renamed to plat_mem_setup and a second platform
625 * initialization hook for anything else was introduced.
626 */
arch_mem_init(char ** cmdline_p)627 static void __init arch_mem_init(char **cmdline_p)
628 {
629 /* call board setup routine */
630 plat_mem_setup();
631 memblock_set_bottom_up(true);
632
633 bootcmdline_init();
634 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
635 *cmdline_p = command_line;
636
637 parse_early_param();
638
639 if (usermem)
640 pr_info("User-defined physical RAM map overwrite\n");
641
642 check_kernel_sections_mem();
643
644 early_init_fdt_reserve_self();
645 early_init_fdt_scan_reserved_mem();
646
647 #ifndef CONFIG_NUMA
648 memblock_set_node(0, PHYS_ADDR_MAX, &memblock.memory, 0);
649 #endif
650 bootmem_init();
651
652 /*
653 * Prevent memblock from allocating high memory.
654 * This cannot be done before max_low_pfn is detected, so up
655 * to this point is possible to only reserve physical memory
656 * with memblock_reserve; memblock_alloc* can be used
657 * only after this point
658 */
659 memblock_set_current_limit(PFN_PHYS(max_low_pfn));
660
661 mips_reserve_vmcore();
662
663 mips_parse_crashkernel();
664 device_tree_init();
665
666 /*
667 * In order to reduce the possibility of kernel panic when failed to
668 * get IO TLB memory under CONFIG_SWIOTLB, it is better to allocate
669 * low memory as small as possible before plat_swiotlb_setup(), so
670 * make sparse_init() using top-down allocation.
671 */
672 memblock_set_bottom_up(false);
673 sparse_init();
674 memblock_set_bottom_up(true);
675
676 plat_swiotlb_setup();
677
678 dma_contiguous_reserve(PFN_PHYS(max_low_pfn));
679
680 /* Reserve for hibernation. */
681 memblock_reserve(__pa_symbol(&__nosave_begin),
682 __pa_symbol(&__nosave_end) - __pa_symbol(&__nosave_begin));
683
684 early_memtest(PFN_PHYS(ARCH_PFN_OFFSET), PFN_PHYS(max_low_pfn));
685 }
686
resource_init(void)687 static void __init resource_init(void)
688 {
689 phys_addr_t start, end;
690 u64 i;
691
692 if (UNCAC_BASE != IO_BASE)
693 return;
694
695 code_resource.start = __pa_symbol(&_text);
696 code_resource.end = __pa_symbol(&_etext) - 1;
697 data_resource.start = __pa_symbol(&_etext);
698 data_resource.end = __pa_symbol(&_edata) - 1;
699 bss_resource.start = __pa_symbol(&__bss_start);
700 bss_resource.end = __pa_symbol(&__bss_stop) - 1;
701
702 for_each_mem_range(i, &start, &end) {
703 struct resource *res;
704
705 res = memblock_alloc(sizeof(struct resource), SMP_CACHE_BYTES);
706 if (!res)
707 panic("%s: Failed to allocate %zu bytes\n", __func__,
708 sizeof(struct resource));
709
710 res->start = start;
711 /*
712 * In memblock, end points to the first byte after the
713 * range while in resourses, end points to the last byte in
714 * the range.
715 */
716 res->end = end - 1;
717 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
718 res->name = "System RAM";
719
720 request_resource(&iomem_resource, res);
721
722 /*
723 * We don't know which RAM region contains kernel data,
724 * so we try it repeatedly and let the resource manager
725 * test it.
726 */
727 request_resource(res, &code_resource);
728 request_resource(res, &data_resource);
729 request_resource(res, &bss_resource);
730 request_crashkernel(res);
731 }
732 }
733
734 #ifdef CONFIG_SMP
prefill_possible_map(void)735 static void __init prefill_possible_map(void)
736 {
737 int i, possible = num_possible_cpus();
738
739 if (possible > nr_cpu_ids)
740 possible = nr_cpu_ids;
741
742 for (i = 0; i < possible; i++)
743 set_cpu_possible(i, true);
744 for (; i < NR_CPUS; i++)
745 set_cpu_possible(i, false);
746
747 nr_cpu_ids = possible;
748 }
749 #else
prefill_possible_map(void)750 static inline void prefill_possible_map(void) {}
751 #endif
752
setup_arch(char ** cmdline_p)753 void __init setup_arch(char **cmdline_p)
754 {
755 cpu_probe();
756 mips_cm_probe();
757 prom_init();
758
759 setup_early_fdc_console();
760 #ifdef CONFIG_EARLY_PRINTK
761 setup_early_printk();
762 #endif
763 cpu_report();
764 check_bugs_early();
765
766 #if defined(CONFIG_VT)
767 #if defined(CONFIG_VGA_CONSOLE)
768 conswitchp = &vga_con;
769 #endif
770 #endif
771
772 arch_mem_init(cmdline_p);
773 dmi_setup();
774
775 resource_init();
776 plat_smp_setup();
777 prefill_possible_map();
778
779 cpu_cache_init();
780 paging_init();
781
782 memblock_dump_all();
783 }
784
785 unsigned long kernelsp[NR_CPUS];
786 unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
787
788 #ifdef CONFIG_DEBUG_FS
789 struct dentry *mips_debugfs_dir;
debugfs_mips(void)790 static int __init debugfs_mips(void)
791 {
792 mips_debugfs_dir = debugfs_create_dir("mips", NULL);
793 return 0;
794 }
795 arch_initcall(debugfs_mips);
796 #endif
797
798 #ifdef CONFIG_DMA_NONCOHERENT
setcoherentio(char * str)799 static int __init setcoherentio(char *str)
800 {
801 dma_default_coherent = true;
802 pr_info("Hardware DMA cache coherency (command line)\n");
803 return 0;
804 }
805 early_param("coherentio", setcoherentio);
806
setnocoherentio(char * str)807 static int __init setnocoherentio(char *str)
808 {
809 dma_default_coherent = false;
810 pr_info("Software DMA cache coherency (command line)\n");
811 return 0;
812 }
813 early_param("nocoherentio", setnocoherentio);
814 #endif
815
arch_cpu_finalize_init(void)816 void __init arch_cpu_finalize_init(void)
817 {
818 unsigned int cpu = smp_processor_id();
819
820 cpu_data[cpu].udelay_val = loops_per_jiffy;
821 check_bugs32();
822
823 if (IS_ENABLED(CONFIG_CPU_R4X00_BUGS64))
824 check_bugs64();
825 }
826