projects/linux·blob uaccess-cleanups · refs

833 lines · 20.1 KiB

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#include <linux/string.h>
35
36#include <asm/addrspace.h>
37#include <asm/bootinfo.h>
38#include <asm/bugs.h>
39#include <asm/cache.h>
40#include <asm/cdmm.h>
41#include <asm/cpu.h>
42#include <asm/debug.h>
43#include <asm/mmzone.h>
44#include <asm/sections.h>
45#include <asm/setup.h>
46#include <asm/smp-ops.h>
47#include <asm/mips-cps.h>
48#include <asm/prom.h>
49#include <asm/fw/fw.h>
50
51#ifdef CONFIG_MIPS_ELF_APPENDED_DTB
52char __section(".appended_dtb") __appended_dtb[0x100000];
53#endif /* CONFIG_MIPS_ELF_APPENDED_DTB */
54
55struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;
56
57EXPORT_SYMBOL(cpu_data);
58
59/*
60 * Setup information
61 *
62 * These are initialized so they are in the .data section
63 */
64unsigned long mips_machtype __read_mostly = MACH_UNKNOWN;
65
66EXPORT_SYMBOL(mips_machtype);
67
68static char __initdata command_line[COMMAND_LINE_SIZE];
69char __initdata arcs_cmdline[COMMAND_LINE_SIZE];
70
71#ifdef CONFIG_CMDLINE_BOOL
72static const char builtin_cmdline[] __initconst = CONFIG_CMDLINE;
73#else
74static 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 */
81unsigned long mips_io_port_base = -1;
82EXPORT_SYMBOL(mips_io_port_base);
83
84static struct resource code_resource = { .name = "Kernel code", };
85static struct resource data_resource = { .name = "Kernel data", };
86static struct resource bss_resource = { .name = "Kernel bss", };
87
88unsigned long __kaslr_offset __ro_after_init;
89EXPORT_SYMBOL(__kaslr_offset);
90
91static void *detect_magic __initdata = detect_memory_region;
92
93#ifdef CONFIG_MIPS_AUTO_PFN_OFFSET
94unsigned long ARCH_PFN_OFFSET;
95EXPORT_SYMBOL(ARCH_PFN_OFFSET);
96#endif
97
98void __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
122static 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}
135early_param("rd_start", rd_start_early);
136
137static int __init rd_size_early(char *p)
138{
139 initrd_end += memparse(p, &p);
140 return 0;
141}
142early_param("rd_size", rd_size_early);
143
144/* it returns the next free pfn after initrd */
145static 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 * perform 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);
180disable:
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. */
189static 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
215static 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;
236disable:
237 printk(KERN_CONT " - disabling initrd\n");
238 initrd_start = 0;
239 initrd_end = 0;
240}
241
242#else /* !CONFIG_BLK_DEV_INITRD */
243
244static 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
259static void __init bootmem_init(void)
260{
261 init_initrd();
262 finalize_initrd();
263}
264
265#else /* !CONFIG_SGI_IP27 */
266
267static 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
344static int usermem __initdata;
345
346static int __init early_parse_mem(char *p)
347{
348 phys_addr_t start, size;
349
350 if (!p) {
351 pr_err("mem parameter is empty, do nothing\n");
352 return -EINVAL;
353 }
354
355 /*
356 * If a user specifies memory size, we
357 * blow away any automatically generated
358 * size.
359 */
360 if (usermem == 0) {
361 usermem = 1;
362 memblock_remove(memblock_start_of_DRAM(),
363 memblock_end_of_DRAM() - memblock_start_of_DRAM());
364 }
365 start = 0;
366 size = memparse(p, &p);
367 if (*p == '@')
368 start = memparse(p + 1, &p);
369
370 if (IS_ENABLED(CONFIG_NUMA))
371 memblock_add_node(start, size, pa_to_nid(start), MEMBLOCK_NONE);
372 else
373 memblock_add(start, size);
374
375 return 0;
376}
377early_param("mem", early_parse_mem);
378
379static int __init early_parse_memmap(char *p)
380{
381 char *oldp;
382 u64 start_at, mem_size;
383
384 if (!p)
385 return -EINVAL;
386
387 if (!strncmp(p, "exactmap", 8)) {
388 pr_err("\"memmap=exactmap\" invalid on MIPS\n");
389 return 0;
390 }
391
392 oldp = p;
393 mem_size = memparse(p, &p);
394 if (p == oldp)
395 return -EINVAL;
396
397 if (*p == '@') {
398 start_at = memparse(p+1, &p);
399 memblock_add(start_at, mem_size);
400 } else if (*p == '#') {
401 pr_err("\"memmap=nn#ss\" (force ACPI data) invalid on MIPS\n");
402 return -EINVAL;
403 } else if (*p == '$') {
404 start_at = memparse(p+1, &p);
405 memblock_add(start_at, mem_size);
406 memblock_reserve(start_at, mem_size);
407 } else {
408 pr_err("\"memmap\" invalid format!\n");
409 return -EINVAL;
410 }
411
412 if (*p == '\0') {
413 usermem = 1;
414 return 0;
415 } else
416 return -EINVAL;
417}
418early_param("memmap", early_parse_memmap);
419
420static void __init mips_reserve_vmcore(void)
421{
422#ifdef CONFIG_PROC_VMCORE
423 phys_addr_t start, end;
424 u64 i;
425
426 if (!elfcorehdr_size) {
427 for_each_mem_range(i, &start, &end) {
428 if (elfcorehdr_addr >= start && elfcorehdr_addr < end) {
429 /*
430 * Reserve from the elf core header to the end of
431 * the memory segment, that should all be kdump
432 * reserved memory.
433 */
434 elfcorehdr_size = end - elfcorehdr_addr;
435 break;
436 }
437 }
438 }
439
440 pr_info("Reserving %ldKB of memory at %ldKB for kdump\n",
441 (unsigned long)elfcorehdr_size >> 10, (unsigned long)elfcorehdr_addr >> 10);
442
443 memblock_reserve(elfcorehdr_addr, elfcorehdr_size);
444#endif
445}
446
447/* 64M alignment for crash kernel regions */
448#define CRASH_ALIGN SZ_64M
449#define CRASH_ADDR_MAX SZ_512M
450
451static void __init mips_parse_crashkernel(void)
452{
453 unsigned long long total_mem;
454 unsigned long long crash_size, crash_base;
455 int ret;
456
457 if (!IS_ENABLED(CONFIG_CRASH_RESERVE))
458 return;
459
460 total_mem = memblock_phys_mem_size();
461 ret = parse_crashkernel(boot_command_line, total_mem,
462 &crash_size, &crash_base,
463 NULL, NULL, NULL);
464 if (ret != 0 || crash_size <= 0)
465 return;
466
467 if (crash_base <= 0) {
468 crash_base = memblock_phys_alloc_range(crash_size, CRASH_ALIGN,
469 CRASH_ALIGN,
470 CRASH_ADDR_MAX);
471 if (!crash_base) {
472 pr_warn("crashkernel reservation failed - No suitable area found.\n");
473 return;
474 }
475 } else {
476 unsigned long long start;
477
478 start = memblock_phys_alloc_range(crash_size, 1,
479 crash_base,
480 crash_base + crash_size);
481 if (start != crash_base) {
482 pr_warn("Invalid memory region reserved for crash kernel\n");
483 return;
484 }
485 }
486
487 crashk_res.start = crash_base;
488 crashk_res.end = crash_base + crash_size - 1;
489}
490
491static void __init request_crashkernel(struct resource *res)
492{
493 int ret;
494
495 if (!IS_ENABLED(CONFIG_CRASH_RESERVE))
496 return;
497
498 if (crashk_res.start == crashk_res.end)
499 return;
500
501 ret = request_resource(res, &crashk_res);
502 if (!ret)
503 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",
504 (unsigned long)(resource_size(&crashk_res) >> 20),
505 (unsigned long)(crashk_res.start >> 20));
506}
507
508static void __init check_kernel_sections_mem(void)
509{
510 phys_addr_t start = __pa_symbol(&_text);
511 phys_addr_t size = __pa_symbol(&_end) - start;
512
513 if (!memblock_is_region_memory(start, size)) {
514 pr_info("Kernel sections are not in the memory maps\n");
515 memblock_add(start, size);
516 }
517}
518
519static void __init bootcmdline_append(const char *s, size_t max)
520{
521 if (!s[0] || !max)
522 return;
523
524 if (boot_command_line[0])
525 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
526
527 strlcat(boot_command_line, s, max);
528}
529
530#ifdef CONFIG_OF_EARLY_FLATTREE
531
532static int __init bootcmdline_scan_chosen(unsigned long node, const char *uname,
533 int depth, void *data)
534{
535 bool *dt_bootargs = data;
536 const char *p;
537 int l;
538
539 if (depth != 1 || !data ||
540 (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0))
541 return 0;
542
543 p = of_get_flat_dt_prop(node, "bootargs", &l);
544 if (p != NULL && l > 0) {
545 if (strnlen(p, l) >= l)
546 return 1;
547
548 bootcmdline_append(p, min(l, COMMAND_LINE_SIZE));
549 *dt_bootargs = true;
550 }
551
552 return 1;
553}
554
555#endif /* CONFIG_OF_EARLY_FLATTREE */
556
557static void __init bootcmdline_init(void)
558{
559 bool dt_bootargs = false;
560
561 /*
562 * If CMDLINE_OVERRIDE is enabled then initializing the command line is
563 * trivial - we simply use the built-in command line unconditionally &
564 * unmodified.
565 */
566 if (IS_ENABLED(CONFIG_CMDLINE_OVERRIDE)) {
567 strscpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
568 return;
569 }
570
571 /*
572 * If the user specified a built-in command line &
573 * MIPS_CMDLINE_BUILTIN_EXTEND, then the built-in command line is
574 * prepended to arguments from the bootloader or DT so we'll copy them
575 * to the start of boot_command_line here. Otherwise, empty
576 * boot_command_line to undo anything early_init_dt_scan_chosen() did.
577 */
578 if (IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND))
579 strscpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
580 else
581 boot_command_line[0] = 0;
582
583#ifdef CONFIG_OF_EARLY_FLATTREE
584 /*
585 * If we're configured to take boot arguments from DT, look for those
586 * now.
587 */
588 if (IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_DTB) ||
589 IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND))
590 of_scan_flat_dt(bootcmdline_scan_chosen, &dt_bootargs);
591#endif
592
593 /*
594 * If we didn't get any arguments from DT (regardless of whether that's
595 * because we weren't configured to look for them, or because we looked
596 * & found none) then we'll take arguments from the bootloader.
597 * plat_mem_setup() should have filled arcs_cmdline with arguments from
598 * the bootloader.
599 */
600 if (IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND) || !dt_bootargs)
601 bootcmdline_append(arcs_cmdline, COMMAND_LINE_SIZE);
602
603 /*
604 * If the user specified a built-in command line & we didn't already
605 * prepend it, we append it to boot_command_line here.
606 */
607 if (IS_ENABLED(CONFIG_CMDLINE_BOOL) &&
608 !IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND))
609 bootcmdline_append(builtin_cmdline, COMMAND_LINE_SIZE);
610}
611
612/*
613 * arch_mem_init - initialize memory management subsystem
614 *
615 * o plat_mem_setup() detects the memory configuration and will record detected
616 * memory areas using memblock_add.
617 *
618 * At this stage the memory configuration of the system is known to the
619 * kernel but generic memory management system is still entirely uninitialized.
620 *
621 * o bootmem_init()
622 * o pagetable_init()
623 * o dma_contiguous_reserve()
624 *
625 * At this stage the bootmem allocator is ready to use.
626 *
627 * NOTE: historically plat_mem_setup did the entire platform initialization.
628 * This was rather impractical because it meant plat_mem_setup had to
629 * get away without any kind of memory allocator. To keep old code from
630 * breaking plat_setup was just renamed to plat_mem_setup and a second platform
631 * initialization hook for anything else was introduced.
632 */
633static void __init arch_mem_init(char **cmdline_p)
634{
635 /* call board setup routine */
636 plat_mem_setup();
637 memblock_set_bottom_up(true);
638
639 bootcmdline_init();
640 strscpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
641 *cmdline_p = command_line;
642
643 parse_early_param();
644
645 if (usermem)
646 pr_info("User-defined physical RAM map overwrite\n");
647
648 check_kernel_sections_mem();
649
650 early_init_fdt_reserve_self();
651 early_init_fdt_scan_reserved_mem();
652
653#ifndef CONFIG_NUMA
654 memblock_set_node(0, PHYS_ADDR_MAX, &memblock.memory, 0);
655#endif
656 bootmem_init();
657
658 /*
659 * Prevent memblock from allocating high memory.
660 * This cannot be done before max_low_pfn is detected, so up
661 * to this point is possible to only reserve physical memory
662 * with memblock_reserve; memblock_alloc* can be used
663 * only after this point
664 */
665 memblock_set_current_limit(PFN_PHYS(max_low_pfn));
666
667 mips_reserve_vmcore();
668
669 mips_parse_crashkernel();
670 device_tree_init();
671
672 plat_swiotlb_setup();
673
674 dma_contiguous_reserve(PFN_PHYS(max_low_pfn));
675
676 /* Reserve for hibernation. */
677 memblock_reserve(__pa_symbol(&__nosave_begin),
678 __pa_symbol(&__nosave_end) - __pa_symbol(&__nosave_begin));
679
680 early_memtest(PFN_PHYS(ARCH_PFN_OFFSET), PFN_PHYS(max_low_pfn));
681}
682
683static void __init resource_init(void)
684{
685 phys_addr_t start, end;
686 u64 i;
687
688 if (UNCAC_BASE != IO_BASE)
689 return;
690
691 code_resource.start = __pa_symbol(&_text);
692 code_resource.end = __pa_symbol(&_etext) - 1;
693 data_resource.start = __pa_symbol(&_etext);
694 data_resource.end = __pa_symbol(&_edata) - 1;
695 bss_resource.start = __pa_symbol(&__bss_start);
696 bss_resource.end = __pa_symbol(&__bss_stop) - 1;
697
698 for_each_mem_range(i, &start, &end) {
699 struct resource *res;
700
701 res = memblock_alloc_or_panic(sizeof(struct resource), SMP_CACHE_BYTES);
702
703 res->start = start;
704 /*
705 * In memblock, end points to the first byte after the
706 * range while in resourses, end points to the last byte in
707 * the range.
708 */
709 res->end = end - 1;
710 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
711 res->name = "System RAM";
712
713 request_resource(&iomem_resource, res);
714
715 /*
716 * We don't know which RAM region contains kernel data,
717 * so we try it repeatedly and let the resource manager
718 * test it.
719 */
720 request_resource(res, &code_resource);
721 request_resource(res, &data_resource);
722 request_resource(res, &bss_resource);
723 request_crashkernel(res);
724 }
725}
726
727#ifdef CONFIG_SMP
728static void __init prefill_possible_map(void)
729{
730 int i, possible = num_possible_cpus();
731
732 if (possible > nr_cpu_ids)
733 possible = nr_cpu_ids;
734
735 for (i = 0; i < possible; i++)
736 set_cpu_possible(i, true);
737 for (; i < NR_CPUS; i++)
738 set_cpu_possible(i, false);
739
740 set_nr_cpu_ids(possible);
741}
742#else
743static inline void prefill_possible_map(void) {}
744#endif
745
746static void __init setup_rng_seed(void)
747{
748 char *rng_seed_hex = fw_getenv("rngseed");
749 u8 rng_seed[512];
750 size_t len;
751
752 if (!rng_seed_hex)
753 return;
754
755 len = min(sizeof(rng_seed), strlen(rng_seed_hex) / 2);
756 if (hex2bin(rng_seed, rng_seed_hex, len))
757 return;
758
759 add_bootloader_randomness(rng_seed, len);
760 memzero_explicit(rng_seed, len);
761 memzero_explicit(rng_seed_hex, len * 2);
762}
763
764void __init setup_arch(char **cmdline_p)
765{
766 cpu_probe();
767 mips_cm_probe();
768 prom_init();
769
770 setup_early_fdc_console();
771#ifdef CONFIG_EARLY_PRINTK
772 setup_early_printk();
773#endif
774 cpu_report();
775 if (IS_ENABLED(CONFIG_CPU_R4X00_BUGS64))
776 check_bugs64_early();
777
778 arch_mem_init(cmdline_p);
779 dmi_setup();
780
781 resource_init();
782 plat_smp_setup();
783 prefill_possible_map();
784
785 cpu_cache_init();
786 pagetable_init();
787
788 memblock_dump_all();
789
790 setup_rng_seed();
791}
792
793unsigned long kernelsp[NR_CPUS];
794unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
795
796#ifdef CONFIG_DEBUG_FS
797struct dentry *mips_debugfs_dir;
798static int __init debugfs_mips(void)
799{
800 mips_debugfs_dir = debugfs_create_dir("mips", NULL);
801 return 0;
802}
803arch_initcall(debugfs_mips);
804#endif
805
806#ifdef CONFIG_DMA_NONCOHERENT
807static int __init setcoherentio(char *str)
808{
809 dma_default_coherent = true;
810 pr_info("Hardware DMA cache coherency (command line)\n");
811 return 0;
812}
813early_param("coherentio", setcoherentio);
814
815static int __init setnocoherentio(char *str)
816{
817 dma_default_coherent = false;
818 pr_info("Software DMA cache coherency (command line)\n");
819 return 0;
820}
821early_param("nocoherentio", setnocoherentio);
822#endif
823
824void __init arch_cpu_finalize_init(void)
825{
826 unsigned int cpu = smp_processor_id();
827
828 cpu_data[cpu].udelay_val = loops_per_jiffy;
829 check_bugs32();
830
831 if (IS_ENABLED(CONFIG_CPU_R4X00_BUGS64))
832 check_bugs64();
833}