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/hex.h>
17 #include <linux/ioport.h>
18 #include <linux/export.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/mmzone.h>
43 #include <asm/sections.h>
44 #include <asm/setup.h>
45 #include <asm/smp-ops.h>
46 #include <asm/mips-cps.h>
47 #include <asm/prom.h>
48 #include <asm/fw/fw.h>
49
50 #ifdef CONFIG_MIPS_ELF_APPENDED_DTB
51 char __section(".appended_dtb") __appended_dtb[0x100000];
52 #endif /* CONFIG_MIPS_ELF_APPENDED_DTB */
53
54 struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;
55
56 EXPORT_SYMBOL(cpu_data);
57
58 /*
59 * Setup information
60 *
61 * These are initialized so they are in the .data section
62 */
63 unsigned long mips_machtype __read_mostly = MACH_UNKNOWN;
64
65 EXPORT_SYMBOL(mips_machtype);
66
67 static char __initdata command_line[COMMAND_LINE_SIZE];
68 char __initdata arcs_cmdline[COMMAND_LINE_SIZE];
69
70 #ifdef CONFIG_CMDLINE_BOOL
71 static const char builtin_cmdline[] __initconst = CONFIG_CMDLINE;
72 #else
73 static const char builtin_cmdline[] __initconst = "";
74 #endif
75
76 /*
77 * mips_io_port_base is the begin of the address space to which x86 style
78 * I/O ports are mapped.
79 */
80 unsigned long mips_io_port_base = -1;
81 EXPORT_SYMBOL(mips_io_port_base);
82
83 static struct resource code_resource = { .name = "Kernel code", };
84 static struct resource data_resource = { .name = "Kernel data", };
85 static struct resource bss_resource = { .name = "Kernel bss", };
86
87 unsigned long __kaslr_offset __ro_after_init;
88 EXPORT_SYMBOL(__kaslr_offset);
89
90 static void *detect_magic __initdata = detect_memory_region;
91
92 #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET
93 unsigned long ARCH_PFN_OFFSET;
94 EXPORT_SYMBOL(ARCH_PFN_OFFSET);
95 #endif
96
detect_memory_region(phys_addr_t start,phys_addr_t sz_min,phys_addr_t sz_max)97 void __init detect_memory_region(phys_addr_t start, phys_addr_t sz_min, phys_addr_t sz_max)
98 {
99 void *dm = &detect_magic;
100 phys_addr_t size;
101
102 for (size = sz_min; size < sz_max; size <<= 1) {
103 if (!memcmp(dm, dm + size, sizeof(detect_magic)))
104 break;
105 }
106
107 pr_debug("Memory: %lluMB of RAM detected at 0x%llx (min: %lluMB, max: %lluMB)\n",
108 ((unsigned long long) size) / SZ_1M,
109 (unsigned long long) start,
110 ((unsigned long long) sz_min) / SZ_1M,
111 ((unsigned long long) sz_max) / SZ_1M);
112
113 memblock_add(start, size);
114 }
115
116 /*
117 * Manage initrd
118 */
119 #ifdef CONFIG_BLK_DEV_INITRD
120
rd_start_early(char * p)121 static int __init rd_start_early(char *p)
122 {
123 unsigned long start = memparse(p, &p);
124
125 #ifdef CONFIG_64BIT
126 /* Guess if the sign extension was forgotten by bootloader */
127 if (start < XKPHYS)
128 start = (int)start;
129 #endif
130 initrd_start = start;
131 initrd_end += start;
132 return 0;
133 }
134 early_param("rd_start", rd_start_early);
135
rd_size_early(char * p)136 static int __init rd_size_early(char *p)
137 {
138 initrd_end += memparse(p, &p);
139 return 0;
140 }
141 early_param("rd_size", rd_size_early);
142
143 /* it returns the next free pfn after initrd */
init_initrd(void)144 static unsigned long __init init_initrd(void)
145 {
146 unsigned long end;
147
148 /*
149 * Board specific code or command line parser should have
150 * already set up initrd_start and initrd_end. In these cases
151 * perform sanity checks and use them if all looks good.
152 */
153 if (!initrd_start || initrd_end <= initrd_start)
154 goto disable;
155
156 if (initrd_start & ~PAGE_MASK) {
157 pr_err("initrd start must be page aligned\n");
158 goto disable;
159 }
160
161 /*
162 * Sanitize initrd addresses. For example firmware
163 * can't guess if they need to pass them through
164 * 64-bits values if the kernel has been built in pure
165 * 32-bit. We need also to switch from KSEG0 to XKPHYS
166 * addresses now, so the code can now safely use __pa().
167 */
168 end = __pa(initrd_end);
169 initrd_end = (unsigned long)__va(end);
170 initrd_start = (unsigned long)__va(__pa(initrd_start));
171
172 if (initrd_start < PAGE_OFFSET) {
173 pr_err("initrd start < PAGE_OFFSET\n");
174 goto disable;
175 }
176
177 ROOT_DEV = Root_RAM0;
178 return PFN_UP(end);
179 disable:
180 initrd_start = 0;
181 initrd_end = 0;
182 return 0;
183 }
184
185 /* In some conditions (e.g. big endian bootloader with a little endian
186 kernel), the initrd might appear byte swapped. Try to detect this and
187 byte swap it if needed. */
maybe_bswap_initrd(void)188 static void __init maybe_bswap_initrd(void)
189 {
190 #if defined(CONFIG_CPU_CAVIUM_OCTEON)
191 u64 buf;
192
193 /* Check for CPIO signature */
194 if (!memcmp((void *)initrd_start, "070701", 6))
195 return;
196
197 /* Check for compressed initrd */
198 if (decompress_method((unsigned char *)initrd_start, 8, NULL))
199 return;
200
201 /* Try again with a byte swapped header */
202 buf = swab64p((u64 *)initrd_start);
203 if (!memcmp(&buf, "070701", 6) ||
204 decompress_method((unsigned char *)(&buf), 8, NULL)) {
205 unsigned long i;
206
207 pr_info("Byteswapped initrd detected\n");
208 for (i = initrd_start; i < ALIGN(initrd_end, 8); i += 8)
209 swab64s((u64 *)i);
210 }
211 #endif
212 }
213
finalize_initrd(void)214 static void __init finalize_initrd(void)
215 {
216 unsigned long size = initrd_end - initrd_start;
217
218 if (size == 0) {
219 printk(KERN_INFO "Initrd not found or empty");
220 goto disable;
221 }
222 if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
223 printk(KERN_ERR "Initrd extends beyond end of memory");
224 goto disable;
225 }
226
227 maybe_bswap_initrd();
228
229 memblock_reserve(__pa(initrd_start), size);
230 initrd_below_start_ok = 1;
231
232 pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",
233 initrd_start, size);
234 return;
235 disable:
236 printk(KERN_CONT " - disabling initrd\n");
237 initrd_start = 0;
238 initrd_end = 0;
239 }
240
241 #else /* !CONFIG_BLK_DEV_INITRD */
242
init_initrd(void)243 static unsigned long __init init_initrd(void)
244 {
245 return 0;
246 }
247
248 #define finalize_initrd() do {} while (0)
249
250 #endif
251
252 /*
253 * Initialize the bootmem allocator. It also setup initrd related data
254 * if needed.
255 */
256 #if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON64) && defined(CONFIG_NUMA))
257
bootmem_init(void)258 static void __init bootmem_init(void)
259 {
260 init_initrd();
261 finalize_initrd();
262 }
263
264 #else /* !CONFIG_SGI_IP27 */
265
bootmem_init(void)266 static void __init bootmem_init(void)
267 {
268 phys_addr_t ramstart, ramend;
269 unsigned long start, end;
270 int i;
271
272 ramstart = memblock_start_of_DRAM();
273 ramend = memblock_end_of_DRAM();
274
275 /*
276 * Sanity check any INITRD first. We don't take it into account
277 * for bootmem setup initially, rely on the end-of-kernel-code
278 * as our memory range starting point. Once bootmem is inited we
279 * will reserve the area used for the initrd.
280 */
281 init_initrd();
282
283 /* Reserve memory occupied by kernel. */
284 memblock_reserve(__pa_symbol(&_text),
285 __pa_symbol(&_end) - __pa_symbol(&_text));
286
287 /* max_low_pfn is not a number of pages but the end pfn of low mem */
288
289 #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET
290 ARCH_PFN_OFFSET = PFN_UP(ramstart);
291 #else
292 /*
293 * Reserve any memory between the start of RAM and PHYS_OFFSET
294 */
295 if (ramstart > PHYS_OFFSET)
296 memblock_reserve(PHYS_OFFSET, ramstart - PHYS_OFFSET);
297
298 if (PFN_UP(ramstart) > ARCH_PFN_OFFSET) {
299 pr_info("Wasting %lu bytes for tracking %lu unused pages\n",
300 (unsigned long)((PFN_UP(ramstart) - ARCH_PFN_OFFSET) * sizeof(struct page)),
301 (unsigned long)(PFN_UP(ramstart) - ARCH_PFN_OFFSET));
302 }
303 #endif
304
305 min_low_pfn = ARCH_PFN_OFFSET;
306 max_pfn = PFN_DOWN(ramend);
307 for_each_mem_pfn_range(i, MAX_NUMNODES, &start, &end, NULL) {
308 /*
309 * Skip highmem here so we get an accurate max_low_pfn if low
310 * memory stops short of high memory.
311 * If the region overlaps HIGHMEM_START, end is clipped so
312 * max_pfn excludes the highmem portion.
313 */
314 if (start >= PFN_DOWN(HIGHMEM_START))
315 continue;
316 if (end > PFN_DOWN(HIGHMEM_START))
317 end = PFN_DOWN(HIGHMEM_START);
318 if (end > max_low_pfn)
319 max_low_pfn = end;
320 }
321
322 if (min_low_pfn >= max_low_pfn)
323 panic("Incorrect memory mapping !!!");
324
325 if (max_pfn > PFN_DOWN(HIGHMEM_START)) {
326 max_low_pfn = PFN_DOWN(HIGHMEM_START);
327 #ifdef CONFIG_HIGHMEM
328 highstart_pfn = max_low_pfn;
329 highend_pfn = max_pfn;
330 #else
331 max_pfn = max_low_pfn;
332 #endif
333 }
334
335 /*
336 * Reserve initrd memory if needed.
337 */
338 finalize_initrd();
339 }
340
341 #endif /* CONFIG_SGI_IP27 */
342
343 static int usermem __initdata;
344
early_parse_mem(char * p)345 static int __init early_parse_mem(char *p)
346 {
347 phys_addr_t start, size;
348
349 if (!p) {
350 pr_err("mem parameter is empty, do nothing\n");
351 return -EINVAL;
352 }
353
354 /*
355 * If a user specifies memory size, we
356 * blow away any automatically generated
357 * size.
358 */
359 if (usermem == 0) {
360 usermem = 1;
361 memblock_remove(memblock_start_of_DRAM(),
362 memblock_end_of_DRAM() - memblock_start_of_DRAM());
363 }
364 start = 0;
365 size = memparse(p, &p);
366 if (*p == '@')
367 start = memparse(p + 1, &p);
368
369 if (IS_ENABLED(CONFIG_NUMA))
370 memblock_add_node(start, size, pa_to_nid(start), MEMBLOCK_NONE);
371 else
372 memblock_add(start, size);
373
374 return 0;
375 }
376 early_param("mem", early_parse_mem);
377
early_parse_memmap(char * p)378 static int __init early_parse_memmap(char *p)
379 {
380 char *oldp;
381 u64 start_at, mem_size;
382
383 if (!p)
384 return -EINVAL;
385
386 if (!strncmp(p, "exactmap", 8)) {
387 pr_err("\"memmap=exactmap\" invalid on MIPS\n");
388 return 0;
389 }
390
391 oldp = p;
392 mem_size = memparse(p, &p);
393 if (p == oldp)
394 return -EINVAL;
395
396 if (*p == '@') {
397 start_at = memparse(p+1, &p);
398 memblock_add(start_at, mem_size);
399 } else if (*p == '#') {
400 pr_err("\"memmap=nn#ss\" (force ACPI data) invalid on MIPS\n");
401 return -EINVAL;
402 } else if (*p == '$') {
403 start_at = memparse(p+1, &p);
404 memblock_add(start_at, mem_size);
405 memblock_reserve(start_at, mem_size);
406 } else {
407 pr_err("\"memmap\" invalid format!\n");
408 return -EINVAL;
409 }
410
411 if (*p == '\0') {
412 usermem = 1;
413 return 0;
414 } else
415 return -EINVAL;
416 }
417 early_param("memmap", early_parse_memmap);
418
mips_reserve_vmcore(void)419 static void __init mips_reserve_vmcore(void)
420 {
421 #ifdef CONFIG_PROC_VMCORE
422 phys_addr_t start, end;
423 u64 i;
424
425 if (!elfcorehdr_size) {
426 for_each_mem_range(i, &start, &end) {
427 if (elfcorehdr_addr >= start && elfcorehdr_addr < end) {
428 /*
429 * Reserve from the elf core header to the end of
430 * the memory segment, that should all be kdump
431 * reserved memory.
432 */
433 elfcorehdr_size = end - elfcorehdr_addr;
434 break;
435 }
436 }
437 }
438
439 pr_info("Reserving %ldKB of memory at %ldKB for kdump\n",
440 (unsigned long)elfcorehdr_size >> 10, (unsigned long)elfcorehdr_addr >> 10);
441
442 memblock_reserve(elfcorehdr_addr, elfcorehdr_size);
443 #endif
444 }
445
446 /* 64M alignment for crash kernel regions */
447 #define CRASH_ALIGN SZ_64M
448 #define CRASH_ADDR_MAX SZ_512M
449
mips_parse_crashkernel(void)450 static void __init mips_parse_crashkernel(void)
451 {
452 unsigned long long total_mem;
453 unsigned long long crash_size, crash_base;
454 int ret;
455
456 if (!IS_ENABLED(CONFIG_CRASH_RESERVE))
457 return;
458
459 total_mem = memblock_phys_mem_size();
460 ret = parse_crashkernel(boot_command_line, total_mem,
461 &crash_size, &crash_base,
462 NULL, NULL, NULL);
463 if (ret != 0 || crash_size <= 0)
464 return;
465
466 if (crash_base <= 0) {
467 crash_base = memblock_phys_alloc_range(crash_size, CRASH_ALIGN,
468 CRASH_ALIGN,
469 CRASH_ADDR_MAX);
470 if (!crash_base) {
471 pr_warn("crashkernel reservation failed - No suitable area found.\n");
472 return;
473 }
474 } else {
475 unsigned long long start;
476
477 start = memblock_phys_alloc_range(crash_size, 1,
478 crash_base,
479 crash_base + crash_size);
480 if (start != crash_base) {
481 pr_warn("Invalid memory region reserved for crash kernel\n");
482 return;
483 }
484 }
485
486 crashk_res.start = crash_base;
487 crashk_res.end = crash_base + crash_size - 1;
488 }
489
request_crashkernel(struct resource * res)490 static void __init request_crashkernel(struct resource *res)
491 {
492 int ret;
493
494 if (!IS_ENABLED(CONFIG_CRASH_RESERVE))
495 return;
496
497 if (crashk_res.start == crashk_res.end)
498 return;
499
500 ret = request_resource(res, &crashk_res);
501 if (!ret)
502 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",
503 (unsigned long)(resource_size(&crashk_res) >> 20),
504 (unsigned long)(crashk_res.start >> 20));
505 }
506
check_kernel_sections_mem(void)507 static void __init check_kernel_sections_mem(void)
508 {
509 phys_addr_t start = __pa_symbol(&_text);
510 phys_addr_t size = __pa_symbol(&_end) - start;
511
512 if (!memblock_is_region_memory(start, size)) {
513 pr_info("Kernel sections are not in the memory maps\n");
514 memblock_add(start, size);
515 }
516 }
517
bootcmdline_append(const char * s,size_t max)518 static void __init bootcmdline_append(const char *s, size_t max)
519 {
520 if (!s[0] || !max)
521 return;
522
523 if (boot_command_line[0])
524 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
525
526 strlcat(boot_command_line, s, max);
527 }
528
529 #ifdef CONFIG_OF_EARLY_FLATTREE
530
bootcmdline_scan_chosen(unsigned long node,const char * uname,int depth,void * data)531 static int __init bootcmdline_scan_chosen(unsigned long node, const char *uname,
532 int depth, void *data)
533 {
534 bool *dt_bootargs = data;
535 const char *p;
536 int l;
537
538 if (depth != 1 || !data ||
539 (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0))
540 return 0;
541
542 p = of_get_flat_dt_prop(node, "bootargs", &l);
543 if (p != NULL && l > 0) {
544 bootcmdline_append(p, min(l, COMMAND_LINE_SIZE));
545 *dt_bootargs = true;
546 }
547
548 return 1;
549 }
550
551 #endif /* CONFIG_OF_EARLY_FLATTREE */
552
bootcmdline_init(void)553 static void __init bootcmdline_init(void)
554 {
555 bool dt_bootargs = false;
556
557 /*
558 * If CMDLINE_OVERRIDE is enabled then initializing the command line is
559 * trivial - we simply use the built-in command line unconditionally &
560 * unmodified.
561 */
562 if (IS_ENABLED(CONFIG_CMDLINE_OVERRIDE)) {
563 strscpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
564 return;
565 }
566
567 /*
568 * If the user specified a built-in command line &
569 * MIPS_CMDLINE_BUILTIN_EXTEND, then the built-in command line is
570 * prepended to arguments from the bootloader or DT so we'll copy them
571 * to the start of boot_command_line here. Otherwise, empty
572 * boot_command_line to undo anything early_init_dt_scan_chosen() did.
573 */
574 if (IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND))
575 strscpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
576 else
577 boot_command_line[0] = 0;
578
579 #ifdef CONFIG_OF_EARLY_FLATTREE
580 /*
581 * If we're configured to take boot arguments from DT, look for those
582 * now.
583 */
584 if (IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_DTB) ||
585 IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND))
586 of_scan_flat_dt(bootcmdline_scan_chosen, &dt_bootargs);
587 #endif
588
589 /*
590 * If we didn't get any arguments from DT (regardless of whether that's
591 * because we weren't configured to look for them, or because we looked
592 * & found none) then we'll take arguments from the bootloader.
593 * plat_mem_setup() should have filled arcs_cmdline with arguments from
594 * the bootloader.
595 */
596 if (IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND) || !dt_bootargs)
597 bootcmdline_append(arcs_cmdline, COMMAND_LINE_SIZE);
598
599 /*
600 * If the user specified a built-in command line & we didn't already
601 * prepend it, we append it to boot_command_line here.
602 */
603 if (IS_ENABLED(CONFIG_CMDLINE_BOOL) &&
604 !IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND))
605 bootcmdline_append(builtin_cmdline, COMMAND_LINE_SIZE);
606 }
607
608 /*
609 * arch_mem_init - initialize memory management subsystem
610 *
611 * o plat_mem_setup() detects the memory configuration and will record detected
612 * memory areas using memblock_add.
613 *
614 * At this stage the memory configuration of the system is known to the
615 * kernel but generic memory management system is still entirely uninitialized.
616 *
617 * o bootmem_init()
618 * o pagetable_init()
619 * o dma_contiguous_reserve()
620 *
621 * At this stage the bootmem allocator is ready to use.
622 *
623 * NOTE: historically plat_mem_setup did the entire platform initialization.
624 * This was rather impractical because it meant plat_mem_setup had to
625 * get away without any kind of memory allocator. To keep old code from
626 * breaking plat_setup was just renamed to plat_mem_setup and a second platform
627 * initialization hook for anything else was introduced.
628 */
arch_mem_init(char ** cmdline_p)629 static void __init arch_mem_init(char **cmdline_p)
630 {
631 /* call board setup routine */
632 plat_mem_setup();
633 memblock_set_bottom_up(true);
634
635 bootcmdline_init();
636 strscpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
637 *cmdline_p = command_line;
638
639 parse_early_param();
640
641 if (usermem)
642 pr_info("User-defined physical RAM map overwrite\n");
643
644 check_kernel_sections_mem();
645
646 early_init_fdt_reserve_self();
647 early_init_fdt_scan_reserved_mem();
648
649 #ifndef CONFIG_NUMA
650 memblock_set_node(0, PHYS_ADDR_MAX, &memblock.memory, 0);
651 #endif
652 bootmem_init();
653
654 /*
655 * Prevent memblock from allocating high memory.
656 * This cannot be done before max_low_pfn is detected, so up
657 * to this point is possible to only reserve physical memory
658 * with memblock_reserve; memblock_alloc* can be used
659 * only after this point
660 */
661 memblock_set_current_limit(PFN_PHYS(max_low_pfn));
662
663 mips_reserve_vmcore();
664
665 mips_parse_crashkernel();
666 device_tree_init();
667
668 plat_swiotlb_setup();
669
670 dma_contiguous_reserve(PFN_PHYS(max_low_pfn));
671
672 /* Reserve for hibernation. */
673 memblock_reserve(__pa_symbol(&__nosave_begin),
674 __pa_symbol(&__nosave_end) - __pa_symbol(&__nosave_begin));
675
676 early_memtest(PFN_PHYS(ARCH_PFN_OFFSET), PFN_PHYS(max_low_pfn));
677 }
678
resource_init(void)679 static void __init resource_init(void)
680 {
681 phys_addr_t start, end;
682 u64 i;
683
684 if (UNCAC_BASE != IO_BASE)
685 return;
686
687 code_resource.start = __pa_symbol(&_text);
688 code_resource.end = __pa_symbol(&_etext) - 1;
689 data_resource.start = __pa_symbol(&_etext);
690 data_resource.end = __pa_symbol(&_edata) - 1;
691 bss_resource.start = __pa_symbol(&__bss_start);
692 bss_resource.end = __pa_symbol(&__bss_stop) - 1;
693
694 for_each_mem_range(i, &start, &end) {
695 struct resource *res;
696
697 res = memblock_alloc_or_panic(sizeof(struct resource), SMP_CACHE_BYTES);
698
699 res->start = start;
700 /*
701 * In memblock, end points to the first byte after the
702 * range while in resourses, end points to the last byte in
703 * the range.
704 */
705 res->end = end - 1;
706 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
707 res->name = "System RAM";
708
709 request_resource(&iomem_resource, res);
710
711 /*
712 * We don't know which RAM region contains kernel data,
713 * so we try it repeatedly and let the resource manager
714 * test it.
715 */
716 request_resource(res, &code_resource);
717 request_resource(res, &data_resource);
718 request_resource(res, &bss_resource);
719 request_crashkernel(res);
720 }
721 }
722
723 #ifdef CONFIG_SMP
prefill_possible_map(void)724 static void __init prefill_possible_map(void)
725 {
726 int i, possible = num_possible_cpus();
727
728 if (possible > nr_cpu_ids)
729 possible = nr_cpu_ids;
730
731 for (i = 0; i < possible; i++)
732 set_cpu_possible(i, true);
733 for (; i < NR_CPUS; i++)
734 set_cpu_possible(i, false);
735
736 set_nr_cpu_ids(possible);
737 }
738 #else
prefill_possible_map(void)739 static inline void prefill_possible_map(void) {}
740 #endif
741
setup_rng_seed(void)742 static void __init setup_rng_seed(void)
743 {
744 char *rng_seed_hex = fw_getenv("rngseed");
745 u8 rng_seed[512];
746 size_t len;
747
748 if (!rng_seed_hex)
749 return;
750
751 len = min(sizeof(rng_seed), strlen(rng_seed_hex) / 2);
752 if (hex2bin(rng_seed, rng_seed_hex, len))
753 return;
754
755 add_bootloader_randomness(rng_seed, len);
756 memzero_explicit(rng_seed, len);
757 memzero_explicit(rng_seed_hex, len * 2);
758 }
759
setup_arch(char ** cmdline_p)760 void __init setup_arch(char **cmdline_p)
761 {
762 cpu_probe();
763 mips_cm_probe();
764 prom_init();
765
766 setup_early_fdc_console();
767 #ifdef CONFIG_EARLY_PRINTK
768 setup_early_printk();
769 #endif
770 cpu_report();
771 if (IS_ENABLED(CONFIG_CPU_R4X00_BUGS64))
772 check_bugs64_early();
773
774 arch_mem_init(cmdline_p);
775 dmi_setup();
776
777 resource_init();
778 plat_smp_setup();
779 prefill_possible_map();
780
781 cpu_cache_init();
782 pagetable_init();
783
784 memblock_dump_all();
785
786 setup_rng_seed();
787 }
788
789 unsigned long kernelsp[NR_CPUS];
790 unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
791
792 #ifdef CONFIG_DEBUG_FS
793 struct dentry *mips_debugfs_dir;
debugfs_mips(void)794 static int __init debugfs_mips(void)
795 {
796 mips_debugfs_dir = debugfs_create_dir("mips", NULL);
797 return 0;
798 }
799 arch_initcall(debugfs_mips);
800 #endif
801
802 #ifdef CONFIG_DMA_NONCOHERENT
setcoherentio(char * str)803 static int __init setcoherentio(char *str)
804 {
805 dma_default_coherent = true;
806 pr_info("Hardware DMA cache coherency (command line)\n");
807 return 0;
808 }
809 early_param("coherentio", setcoherentio);
810
setnocoherentio(char * str)811 static int __init setnocoherentio(char *str)
812 {
813 dma_default_coherent = false;
814 pr_info("Software DMA cache coherency (command line)\n");
815 return 0;
816 }
817 early_param("nocoherentio", setnocoherentio);
818 #endif
819
arch_cpu_finalize_init(void)820 void __init arch_cpu_finalize_init(void)
821 {
822 unsigned int cpu = smp_processor_id();
823
824 cpu_data[cpu].udelay_val = loops_per_jiffy;
825 check_bugs32();
826
827 if (IS_ENABLED(CONFIG_CPU_R4X00_BUGS64))
828 check_bugs64();
829 }
830