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/memblock.h>
19#include <linux/initrd.h>
20#include <linux/root_dev.h>
21#include <linux/highmem.h>
22#include <linux/console.h>
23#include <linux/pfn.h>
24#include <linux/debugfs.h>
25#include <linux/kexec.h>
26#include <linux/sizes.h>
27#include <linux/device.h>
28#include <linux/dma-map-ops.h>
29#include <linux/decompress/generic.h>
30#include <linux/of_fdt.h>
31#include <linux/dmi.h>
32#include <linux/crash_dump.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/mmzone.h>
42#include <asm/sections.h>
43#include <asm/setup.h>
44#include <asm/smp-ops.h>
45#include <asm/prom.h>
46#include <asm/fw/fw.h>
47
48#ifdef CONFIG_MIPS_ELF_APPENDED_DTB
49char __section(".appended_dtb") __appended_dtb[0x100000];
50#endif /* CONFIG_MIPS_ELF_APPENDED_DTB */
51
52struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;
53
54EXPORT_SYMBOL(cpu_data);
55
56/*
57 * Setup information
58 *
59 * These are initialized so they are in the .data section
60 */
61unsigned long mips_machtype __read_mostly = MACH_UNKNOWN;
62
63EXPORT_SYMBOL(mips_machtype);
64
65static char __initdata command_line[COMMAND_LINE_SIZE];
66char __initdata arcs_cmdline[COMMAND_LINE_SIZE];
67
68#ifdef CONFIG_CMDLINE_BOOL
69static const char builtin_cmdline[] __initconst = CONFIG_CMDLINE;
70#else
71static const char builtin_cmdline[] __initconst = "";
72#endif
73
74/*
75 * mips_io_port_base is the begin of the address space to which x86 style
76 * I/O ports are mapped.
77 */
78unsigned long mips_io_port_base = -1;
79EXPORT_SYMBOL(mips_io_port_base);
80
81static struct resource code_resource = { .name = "Kernel code", };
82static struct resource data_resource = { .name = "Kernel data", };
83static struct resource bss_resource = { .name = "Kernel bss", };
84
85unsigned long __kaslr_offset __ro_after_init;
86EXPORT_SYMBOL(__kaslr_offset);
87
88static void *detect_magic __initdata = detect_memory_region;
89
90#ifdef CONFIG_MIPS_AUTO_PFN_OFFSET
91unsigned long ARCH_PFN_OFFSET;
92EXPORT_SYMBOL(ARCH_PFN_OFFSET);
93#endif
94
95void __init detect_memory_region(phys_addr_t start, phys_addr_t sz_min, phys_addr_t sz_max)
96{
97 void *dm = &detect_magic;
98 phys_addr_t size;
99
100 for (size = sz_min; size < sz_max; size <<= 1) {
101 if (!memcmp(p: dm, q: dm + size, size: sizeof(detect_magic)))
102 break;
103 }
104
105 pr_debug("Memory: %lluMB of RAM detected at 0x%llx (min: %lluMB, max: %lluMB)\n",
106 ((unsigned long long) size) / SZ_1M,
107 (unsigned long long) start,
108 ((unsigned long long) sz_min) / SZ_1M,
109 ((unsigned long long) sz_max) / SZ_1M);
110
111 memblock_add(base: start, size);
112}
113
114/*
115 * Manage initrd
116 */
117#ifdef CONFIG_BLK_DEV_INITRD
118
119static int __init rd_start_early(char *p)
120{
121 unsigned long start = memparse(ptr: p, retptr: &p);
122
123#ifdef CONFIG_64BIT
124 /* Guess if the sign extension was forgotten by bootloader */
125 if (start < XKPHYS)
126 start = (int)start;
127#endif
128 initrd_start = start;
129 initrd_end += start;
130 return 0;
131}
132early_param("rd_start", rd_start_early);
133
134static int __init rd_size_early(char *p)
135{
136 initrd_end += memparse(ptr: p, retptr: &p);
137 return 0;
138}
139early_param("rd_size", rd_size_early);
140
141/* it returns the next free pfn after initrd */
142static unsigned long __init init_initrd(void)
143{
144 unsigned long end;
145
146 /*
147 * Board specific code or command line parser should have
148 * already set up initrd_start and initrd_end. In these cases
149 * perfom sanity checks and use them if all looks good.
150 */
151 if (!initrd_start || initrd_end <= initrd_start)
152 goto disable;
153
154 if (initrd_start & ~PAGE_MASK) {
155 pr_err("initrd start must be page aligned\n");
156 goto disable;
157 }
158
159 /*
160 * Sanitize initrd addresses. For example firmware
161 * can't guess if they need to pass them through
162 * 64-bits values if the kernel has been built in pure
163 * 32-bit. We need also to switch from KSEG0 to XKPHYS
164 * addresses now, so the code can now safely use __pa().
165 */
166 end = __pa(initrd_end);
167 initrd_end = (unsigned long)__va(end);
168 initrd_start = (unsigned long)__va(__pa(initrd_start));
169
170 if (initrd_start < PAGE_OFFSET) {
171 pr_err("initrd start < PAGE_OFFSET\n");
172 goto disable;
173 }
174
175 ROOT_DEV = Root_RAM0;
176 return PFN_UP(end);
177disable:
178 initrd_start = 0;
179 initrd_end = 0;
180 return 0;
181}
182
183/* In some conditions (e.g. big endian bootloader with a little endian
184 kernel), the initrd might appear byte swapped. Try to detect this and
185 byte swap it if needed. */
186static void __init maybe_bswap_initrd(void)
187{
188#if defined(CONFIG_CPU_CAVIUM_OCTEON)
189 u64 buf;
190
191 /* Check for CPIO signature */
192 if (!memcmp((void *)initrd_start, "070701", 6))
193 return;
194
195 /* Check for compressed initrd */
196 if (decompress_method((unsigned char *)initrd_start, 8, NULL))
197 return;
198
199 /* Try again with a byte swapped header */
200 buf = swab64p((u64 *)initrd_start);
201 if (!memcmp(&buf, "070701", 6) ||
202 decompress_method((unsigned char *)(&buf), 8, NULL)) {
203 unsigned long i;
204
205 pr_info("Byteswapped initrd detected\n");
206 for (i = initrd_start; i < ALIGN(initrd_end, 8); i += 8)
207 swab64s((u64 *)i);
208 }
209#endif
210}
211
212static void __init finalize_initrd(void)
213{
214 unsigned long size = initrd_end - initrd_start;
215
216 if (size == 0) {
217 printk(KERN_INFO "Initrd not found or empty");
218 goto disable;
219 }
220 if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
221 printk(KERN_ERR "Initrd extends beyond end of memory");
222 goto disable;
223 }
224
225 maybe_bswap_initrd();
226
227 memblock_reserve(__pa(initrd_start), size);
228 initrd_below_start_ok = 1;
229
230 pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",
231 initrd_start, size);
232 return;
233disable:
234 printk(KERN_CONT " - disabling initrd\n");
235 initrd_start = 0;
236 initrd_end = 0;
237}
238
239#else /* !CONFIG_BLK_DEV_INITRD */
240
241static unsigned long __init init_initrd(void)
242{
243 return 0;
244}
245
246#define finalize_initrd() do {} while (0)
247
248#endif
249
250/*
251 * Initialize the bootmem allocator. It also setup initrd related data
252 * if needed.
253 */
254#if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON64) && defined(CONFIG_NUMA))
255
256static void __init bootmem_init(void)
257{
258 init_initrd();
259 finalize_initrd();
260}
261
262#else /* !CONFIG_SGI_IP27 */
263
264static void __init bootmem_init(void)
265{
266 phys_addr_t ramstart, ramend;
267 unsigned long start, end;
268 int i;
269
270 ramstart = memblock_start_of_DRAM();
271 ramend = memblock_end_of_DRAM();
272
273 /*
274 * Sanity check any INITRD first. We don't take it into account
275 * for bootmem setup initially, rely on the end-of-kernel-code
276 * as our memory range starting point. Once bootmem is inited we
277 * will reserve the area used for the initrd.
278 */
279 init_initrd();
280
281 /* Reserve memory occupied by kernel. */
282 memblock_reserve(__pa_symbol(&_text),
283 __pa_symbol(&_end) - __pa_symbol(&_text));
284
285 /* max_low_pfn is not a number of pages but the end pfn of low mem */
286
287#ifdef CONFIG_MIPS_AUTO_PFN_OFFSET
288 ARCH_PFN_OFFSET = PFN_UP(ramstart);
289#else
290 /*
291 * Reserve any memory between the start of RAM and PHYS_OFFSET
292 */
293 if (ramstart > PHYS_OFFSET)
294 memblock_reserve(base: PHYS_OFFSET, size: ramstart - PHYS_OFFSET);
295
296 if (PFN_UP(ramstart) > ARCH_PFN_OFFSET) {
297 pr_info("Wasting %lu bytes for tracking %lu unused pages\n",
298 (unsigned long)((PFN_UP(ramstart) - ARCH_PFN_OFFSET) * sizeof(struct page)),
299 (unsigned long)(PFN_UP(ramstart) - ARCH_PFN_OFFSET));
300 }
301#endif
302
303 min_low_pfn = ARCH_PFN_OFFSET;
304 max_pfn = PFN_DOWN(ramend);
305 for_each_mem_pfn_range(i, MAX_NUMNODES, &start, &end, NULL) {
306 /*
307 * Skip highmem here so we get an accurate max_low_pfn if low
308 * memory stops short of high memory.
309 * If the region overlaps HIGHMEM_START, end is clipped so
310 * max_pfn excludes the highmem portion.
311 */
312 if (start >= PFN_DOWN(HIGHMEM_START))
313 continue;
314 if (end > PFN_DOWN(HIGHMEM_START))
315 end = PFN_DOWN(HIGHMEM_START);
316 if (end > max_low_pfn)
317 max_low_pfn = end;
318 }
319
320 if (min_low_pfn >= max_low_pfn)
321 panic(fmt: "Incorrect memory mapping !!!");
322
323 if (max_pfn > PFN_DOWN(HIGHMEM_START)) {
324#ifdef CONFIG_HIGHMEM
325 highstart_pfn = PFN_DOWN(HIGHMEM_START);
326 highend_pfn = max_pfn;
327#else
328 max_low_pfn = PFN_DOWN(HIGHMEM_START);
329 max_pfn = max_low_pfn;
330#endif
331 }
332
333 /*
334 * Reserve initrd memory if needed.
335 */
336 finalize_initrd();
337}
338
339#endif /* CONFIG_SGI_IP27 */
340
341static int usermem __initdata;
342
343static int __init early_parse_mem(char *p)
344{
345 phys_addr_t start, size;
346
347 if (!p) {
348 pr_err("mem parameter is empty, do nothing\n");
349 return -EINVAL;
350 }
351
352 /*
353 * If a user specifies memory size, we
354 * blow away any automatically generated
355 * size.
356 */
357 if (usermem == 0) {
358 usermem = 1;
359 memblock_remove(base: memblock_start_of_DRAM(),
360 size: memblock_end_of_DRAM() - memblock_start_of_DRAM());
361 }
362 start = 0;
363 size = memparse(ptr: p, retptr: &p);
364 if (*p == '@')
365 start = memparse(ptr: p + 1, retptr: &p);
366
367 if (IS_ENABLED(CONFIG_NUMA))
368 memblock_add_node(base: start, size, nid: pa_to_nid(start), flags: MEMBLOCK_NONE);
369 else
370 memblock_add(base: start, size);
371
372 return 0;
373}
374early_param("mem", early_parse_mem);
375
376static int __init early_parse_memmap(char *p)
377{
378 char *oldp;
379 u64 start_at, mem_size;
380
381 if (!p)
382 return -EINVAL;
383
384 if (!strncmp(p, "exactmap", 8)) {
385 pr_err("\"memmap=exactmap\" invalid on MIPS\n");
386 return 0;
387 }
388
389 oldp = p;
390 mem_size = memparse(ptr: p, retptr: &p);
391 if (p == oldp)
392 return -EINVAL;
393
394 if (*p == '@') {
395 start_at = memparse(ptr: p+1, retptr: &p);
396 memblock_add(base: start_at, size: mem_size);
397 } else if (*p == '#') {
398 pr_err("\"memmap=nn#ss\" (force ACPI data) invalid on MIPS\n");
399 return -EINVAL;
400 } else if (*p == '$') {
401 start_at = memparse(ptr: p+1, retptr: &p);
402 memblock_add(base: start_at, size: mem_size);
403 memblock_reserve(base: start_at, size: mem_size);
404 } else {
405 pr_err("\"memmap\" invalid format!\n");
406 return -EINVAL;
407 }
408
409 if (*p == '\0') {
410 usermem = 1;
411 return 0;
412 } else
413 return -EINVAL;
414}
415early_param("memmap", early_parse_memmap);
416
417static void __init mips_reserve_vmcore(void)
418{
419#ifdef CONFIG_PROC_VMCORE
420 phys_addr_t start, end;
421 u64 i;
422
423 if (!elfcorehdr_size) {
424 for_each_mem_range(i, &start, &end) {
425 if (elfcorehdr_addr >= start && elfcorehdr_addr < end) {
426 /*
427 * Reserve from the elf core header to the end of
428 * the memory segment, that should all be kdump
429 * reserved memory.
430 */
431 elfcorehdr_size = end - elfcorehdr_addr;
432 break;
433 }
434 }
435 }
436
437 pr_info("Reserving %ldKB of memory at %ldKB for kdump\n",
438 (unsigned long)elfcorehdr_size >> 10, (unsigned long)elfcorehdr_addr >> 10);
439
440 memblock_reserve(base: elfcorehdr_addr, size: elfcorehdr_size);
441#endif
442}
443
444#ifdef CONFIG_KEXEC
445
446/* 64M alignment for crash kernel regions */
447#define CRASH_ALIGN SZ_64M
448#define CRASH_ADDR_MAX SZ_512M
449
450static 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 total_mem = memblock_phys_mem_size();
457 ret = parse_crashkernel(cmdline: boot_command_line, system_ram: total_mem,
458 crash_size: &crash_size, crash_base: &crash_base,
459 NULL, NULL);
460 if (ret != 0 || crash_size <= 0)
461 return;
462
463 if (crash_base <= 0) {
464 crash_base = memblock_phys_alloc_range(size: crash_size, CRASH_ALIGN,
465 CRASH_ALIGN,
466 CRASH_ADDR_MAX);
467 if (!crash_base) {
468 pr_warn("crashkernel reservation failed - No suitable area found.\n");
469 return;
470 }
471 } else {
472 unsigned long long start;
473
474 start = memblock_phys_alloc_range(size: crash_size, align: 1,
475 start: crash_base,
476 end: crash_base + crash_size);
477 if (start != crash_base) {
478 pr_warn("Invalid memory region reserved for crash kernel\n");
479 return;
480 }
481 }
482
483 crashk_res.start = crash_base;
484 crashk_res.end = crash_base + crash_size - 1;
485}
486
487static void __init request_crashkernel(struct resource *res)
488{
489 int ret;
490
491 if (crashk_res.start == crashk_res.end)
492 return;
493
494 ret = request_resource(root: res, new: &crashk_res);
495 if (!ret)
496 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",
497 (unsigned long)(resource_size(&crashk_res) >> 20),
498 (unsigned long)(crashk_res.start >> 20));
499}
500#else /* !defined(CONFIG_KEXEC) */
501static void __init mips_parse_crashkernel(void)
502{
503}
504
505static void __init request_crashkernel(struct resource *res)
506{
507}
508#endif /* !defined(CONFIG_KEXEC) */
509
510static void __init check_kernel_sections_mem(void)
511{
512 phys_addr_t start = __pa_symbol(&_text);
513 phys_addr_t size = __pa_symbol(&_end) - start;
514
515 if (!memblock_is_region_memory(base: start, size)) {
516 pr_info("Kernel sections are not in the memory maps\n");
517 memblock_add(base: start, size);
518 }
519}
520
521static void __init bootcmdline_append(const char *s, size_t max)
522{
523 if (!s[0] || !max)
524 return;
525
526 if (boot_command_line[0])
527 strlcat(p: boot_command_line, q: " ", COMMAND_LINE_SIZE);
528
529 strlcat(p: boot_command_line, q: s, avail: max);
530}
531
532#ifdef CONFIG_OF_EARLY_FLATTREE
533
534static int __init bootcmdline_scan_chosen(unsigned long node, const char *uname,
535 int depth, void *data)
536{
537 bool *dt_bootargs = data;
538 const char *p;
539 int l;
540
541 if (depth != 1 || !data ||
542 (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0))
543 return 0;
544
545 p = of_get_flat_dt_prop(node, name: "bootargs", size: &l);
546 if (p != NULL && l > 0) {
547 bootcmdline_append(s: p, min(l, COMMAND_LINE_SIZE));
548 *dt_bootargs = true;
549 }
550
551 return 1;
552}
553
554#endif /* CONFIG_OF_EARLY_FLATTREE */
555
556static void __init bootcmdline_init(void)
557{
558 bool dt_bootargs = false;
559
560 /*
561 * If CMDLINE_OVERRIDE is enabled then initializing the command line is
562 * trivial - we simply use the built-in command line unconditionally &
563 * unmodified.
564 */
565 if (IS_ENABLED(CONFIG_CMDLINE_OVERRIDE)) {
566 strscpy(p: boot_command_line, q: builtin_cmdline, COMMAND_LINE_SIZE);
567 return;
568 }
569
570 /*
571 * If the user specified a built-in command line &
572 * MIPS_CMDLINE_BUILTIN_EXTEND, then the built-in command line is
573 * prepended to arguments from the bootloader or DT so we'll copy them
574 * to the start of boot_command_line here. Otherwise, empty
575 * boot_command_line to undo anything early_init_dt_scan_chosen() did.
576 */
577 if (IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND))
578 strscpy(p: boot_command_line, q: builtin_cmdline, COMMAND_LINE_SIZE);
579 else
580 boot_command_line[0] = 0;
581
582#ifdef CONFIG_OF_EARLY_FLATTREE
583 /*
584 * If we're configured to take boot arguments from DT, look for those
585 * now.
586 */
587 if (IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_DTB) ||
588 IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND))
589 of_scan_flat_dt(it: bootcmdline_scan_chosen, data: &dt_bootargs);
590#endif
591
592 /*
593 * If we didn't get any arguments from DT (regardless of whether that's
594 * because we weren't configured to look for them, or because we looked
595 * & found none) then we'll take arguments from the bootloader.
596 * plat_mem_setup() should have filled arcs_cmdline with arguments from
597 * the bootloader.
598 */
599 if (IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND) || !dt_bootargs)
600 bootcmdline_append(s: arcs_cmdline, COMMAND_LINE_SIZE);
601
602 /*
603 * If the user specified a built-in command line & we didn't already
604 * prepend it, we append it to boot_command_line here.
605 */
606 if (IS_ENABLED(CONFIG_CMDLINE_BOOL) &&
607 !IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND))
608 bootcmdline_append(s: builtin_cmdline, COMMAND_LINE_SIZE);
609}
610
611/*
612 * arch_mem_init - initialize memory management subsystem
613 *
614 * o plat_mem_setup() detects the memory configuration and will record detected
615 * memory areas using memblock_add.
616 *
617 * At this stage the memory configuration of the system is known to the
618 * kernel but generic memory management system is still entirely uninitialized.
619 *
620 * o bootmem_init()
621 * o sparse_init()
622 * o paging_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(enable: true);
638
639 bootcmdline_init();
640 strscpy(p: command_line, q: 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 /*
673 * In order to reduce the possibility of kernel panic when failed to
674 * get IO TLB memory under CONFIG_SWIOTLB, it is better to allocate
675 * low memory as small as possible before plat_swiotlb_setup(), so
676 * make sparse_init() using top-down allocation.
677 */
678 memblock_set_bottom_up(enable: false);
679 sparse_init();
680 memblock_set_bottom_up(enable: true);
681
682 plat_swiotlb_setup();
683
684 dma_contiguous_reserve(PFN_PHYS(max_low_pfn));
685
686 /* Reserve for hibernation. */
687 memblock_reserve(__pa_symbol(&__nosave_begin),
688 __pa_symbol(&__nosave_end) - __pa_symbol(&__nosave_begin));
689
690 early_memtest(PFN_PHYS(ARCH_PFN_OFFSET), PFN_PHYS(max_low_pfn));
691}
692
693static void __init resource_init(void)
694{
695 phys_addr_t start, end;
696 u64 i;
697
698 if (UNCAC_BASE != IO_BASE)
699 return;
700
701 code_resource.start = __pa_symbol(&_text);
702 code_resource.end = __pa_symbol(&_etext) - 1;
703 data_resource.start = __pa_symbol(&_etext);
704 data_resource.end = __pa_symbol(&_edata) - 1;
705 bss_resource.start = __pa_symbol(&__bss_start);
706 bss_resource.end = __pa_symbol(&__bss_stop) - 1;
707
708 for_each_mem_range(i, &start, &end) {
709 struct resource *res;
710
711 res = memblock_alloc(size: sizeof(struct resource), SMP_CACHE_BYTES);
712 if (!res)
713 panic(fmt: "%s: Failed to allocate %zu bytes\n", __func__,
714 sizeof(struct resource));
715
716 res->start = start;
717 /*
718 * In memblock, end points to the first byte after the
719 * range while in resourses, end points to the last byte in
720 * the range.
721 */
722 res->end = end - 1;
723 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
724 res->name = "System RAM";
725
726 request_resource(root: &iomem_resource, new: res);
727
728 /*
729 * We don't know which RAM region contains kernel data,
730 * so we try it repeatedly and let the resource manager
731 * test it.
732 */
733 request_resource(root: res, new: &code_resource);
734 request_resource(root: res, new: &data_resource);
735 request_resource(root: res, new: &bss_resource);
736 request_crashkernel(res);
737 }
738}
739
740#ifdef CONFIG_SMP
741static void __init prefill_possible_map(void)
742{
743 int i, possible = num_possible_cpus();
744
745 if (possible > nr_cpu_ids)
746 possible = nr_cpu_ids;
747
748 for (i = 0; i < possible; i++)
749 set_cpu_possible(cpu: i, possible: true);
750 for (; i < NR_CPUS; i++)
751 set_cpu_possible(cpu: i, possible: false);
752
753 set_nr_cpu_ids(possible);
754}
755#else
756static inline void prefill_possible_map(void) {}
757#endif
758
759static void __init setup_rng_seed(void)
760{
761 char *rng_seed_hex = fw_getenv("rngseed");
762 u8 rng_seed[512];
763 size_t len;
764
765 if (!rng_seed_hex)
766 return;
767
768 len = min(sizeof(rng_seed), strlen(rng_seed_hex) / 2);
769 if (hex2bin(dst: rng_seed, src: rng_seed_hex, count: len))
770 return;
771
772 add_bootloader_randomness(buf: rng_seed, len);
773 memzero_explicit(s: rng_seed, count: len);
774 memzero_explicit(s: rng_seed_hex, count: len * 2);
775}
776
777void __init setup_arch(char **cmdline_p)
778{
779 cpu_probe();
780 mips_cm_probe();
781 prom_init();
782
783 setup_early_fdc_console();
784#ifdef CONFIG_EARLY_PRINTK
785 setup_early_printk();
786#endif
787 cpu_report();
788 if (IS_ENABLED(CONFIG_CPU_R4X00_BUGS64))
789 check_bugs64_early();
790
791 arch_mem_init(cmdline_p);
792 dmi_setup();
793
794 resource_init();
795 plat_smp_setup();
796 prefill_possible_map();
797
798 cpu_cache_init();
799 paging_init();
800
801 memblock_dump_all();
802
803 setup_rng_seed();
804}
805
806unsigned long kernelsp[NR_CPUS];
807unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
808
809#ifdef CONFIG_DEBUG_FS
810struct dentry *mips_debugfs_dir;
811static int __init debugfs_mips(void)
812{
813 mips_debugfs_dir = debugfs_create_dir(name: "mips", NULL);
814 return 0;
815}
816arch_initcall(debugfs_mips);
817#endif
818
819#ifdef CONFIG_DMA_NONCOHERENT
820static int __init setcoherentio(char *str)
821{
822 dma_default_coherent = true;
823 pr_info("Hardware DMA cache coherency (command line)\n");
824 return 0;
825}
826early_param("coherentio", setcoherentio);
827
828static int __init setnocoherentio(char *str)
829{
830 dma_default_coherent = false;
831 pr_info("Software DMA cache coherency (command line)\n");
832 return 0;
833}
834early_param("nocoherentio", setnocoherentio);
835#endif
836
837void __init arch_cpu_finalize_init(void)
838{
839 unsigned int cpu = smp_processor_id();
840
841 cpu_data[cpu].udelay_val = loops_per_jiffy;
842 check_bugs32();
843
844 if (IS_ENABLED(CONFIG_CPU_R4X00_BUGS64))
845 check_bugs64();
846}
847

source code of linux/arch/mips/kernel/setup.c