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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/ioport.h>
15#include <linux/export.h>
16#include <linux/screen_info.h>
17#include <linux/memblock.h>
18#include <linux/initrd.h>
19#include <linux/root_dev.h>
20#include <linux/highmem.h>
21#include <linux/console.h>
22#include <linux/pfn.h>
23#include <linux/debugfs.h>
24#include <linux/kexec.h>
25#include <linux/sizes.h>
26#include <linux/device.h>
27#include <linux/dma-contiguous.h>
28#include <linux/decompress/generic.h>
29#include <linux/of_fdt.h>
30#include <linux/of_reserved_mem.h>
31
32#include <asm/addrspace.h>
33#include <asm/bootinfo.h>
34#include <asm/bugs.h>
35#include <asm/cache.h>
36#include <asm/cdmm.h>
37#include <asm/cpu.h>
38#include <asm/debug.h>
39#include <asm/dma-coherence.h>
40#include <asm/sections.h>
41#include <asm/setup.h>
42#include <asm/smp-ops.h>
43#include <asm/prom.h>
44
45#ifdef CONFIG_MIPS_ELF_APPENDED_DTB
46const char __section(.appended_dtb) __appended_dtb[0x100000];
47#endif /* CONFIG_MIPS_ELF_APPENDED_DTB */
48
49struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;
50
51EXPORT_SYMBOL(cpu_data);
52
53#ifdef CONFIG_VT
54struct screen_info screen_info;
55#endif
56
57/*
58 * Setup information
59 *
60 * These are initialized so they are in the .data section
61 */
62unsigned long mips_machtype __read_mostly = MACH_UNKNOWN;
63
64EXPORT_SYMBOL(mips_machtype);
65
66static char __initdata command_line[COMMAND_LINE_SIZE];
67char __initdata arcs_cmdline[COMMAND_LINE_SIZE];
68
69#ifdef CONFIG_CMDLINE_BOOL
70static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
71#endif
72
73/*
74 * mips_io_port_base is the begin of the address space to which x86 style
75 * I/O ports are mapped.
76 */
77unsigned long mips_io_port_base = -1;
78EXPORT_SYMBOL(mips_io_port_base);
79
80static struct resource code_resource = { .name = "Kernel code", };
81static struct resource data_resource = { .name = "Kernel data", };
82static struct resource bss_resource = { .name = "Kernel bss", };
83
84static void *detect_magic __initdata = detect_memory_region;
85
86#ifdef CONFIG_MIPS_AUTO_PFN_OFFSET
87unsigned long ARCH_PFN_OFFSET;
88EXPORT_SYMBOL(ARCH_PFN_OFFSET);
89#endif
90
91void __init add_memory_region(phys_addr_t start, phys_addr_t size, long type)
92{
93 /*
94 * Note: This function only exists for historical reason,
95 * new code should use memblock_add or memblock_add_node instead.
96 */
97
98 /*
99 * If the region reaches the top of the physical address space, adjust
100 * the size slightly so that (start + size) doesn't overflow
101 */
102 if (start + size - 1 == PHYS_ADDR_MAX)
103 --size;
104
105 /* Sanity check */
106 if (start + size < start) {
107 pr_warn("Trying to add an invalid memory region, skipped\n");
108 return;
109 }
110
111 if (start < PHYS_OFFSET)
112 return;
113
114 memblock_add(start, size);
115 /* Reserve any memory except the ordinary RAM ranges. */
116 switch (type) {
117 case BOOT_MEM_RAM:
118 break;
119
120 case BOOT_MEM_NOMAP: /* Discard the range from the system. */
121 memblock_remove(start, size);
122 break;
123
124 default: /* Reserve the rest of the memory types at boot time */
125 memblock_reserve(start, size);
126 break;
127 }
128}
129
130void __init detect_memory_region(phys_addr_t start, phys_addr_t sz_min, phys_addr_t sz_max)
131{
132 void *dm = &detect_magic;
133 phys_addr_t size;
134
135 for (size = sz_min; size < sz_max; size <<= 1) {
136 if (!memcmp(dm, dm + size, sizeof(detect_magic)))
137 break;
138 }
139
140 pr_debug("Memory: %lluMB of RAM detected at 0x%llx (min: %lluMB, max: %lluMB)\n",
141 ((unsigned long long) size) / SZ_1M,
142 (unsigned long long) start,
143 ((unsigned long long) sz_min) / SZ_1M,
144 ((unsigned long long) sz_max) / SZ_1M);
145
146 add_memory_region(start, size, BOOT_MEM_RAM);
147}
148
149/*
150 * Manage initrd
151 */
152#ifdef CONFIG_BLK_DEV_INITRD
153
154static int __init rd_start_early(char *p)
155{
156 unsigned long start = memparse(p, &p);
157
158#ifdef CONFIG_64BIT
159 /* Guess if the sign extension was forgotten by bootloader */
160 if (start < XKPHYS)
161 start = (int)start;
162#endif
163 initrd_start = start;
164 initrd_end += start;
165 return 0;
166}
167early_param("rd_start", rd_start_early);
168
169static int __init rd_size_early(char *p)
170{
171 initrd_end += memparse(p, &p);
172 return 0;
173}
174early_param("rd_size", rd_size_early);
175
176/* it returns the next free pfn after initrd */
177static unsigned long __init init_initrd(void)
178{
179 unsigned long end;
180
181 /*
182 * Board specific code or command line parser should have
183 * already set up initrd_start and initrd_end. In these cases
184 * perfom sanity checks and use them if all looks good.
185 */
186 if (!initrd_start || initrd_end <= initrd_start)
187 goto disable;
188
189 if (initrd_start & ~PAGE_MASK) {
190 pr_err("initrd start must be page aligned\n");
191 goto disable;
192 }
193 if (initrd_start < PAGE_OFFSET) {
194 pr_err("initrd start < PAGE_OFFSET\n");
195 goto disable;
196 }
197
198 /*
199 * Sanitize initrd addresses. For example firmware
200 * can't guess if they need to pass them through
201 * 64-bits values if the kernel has been built in pure
202 * 32-bit. We need also to switch from KSEG0 to XKPHYS
203 * addresses now, so the code can now safely use __pa().
204 */
205 end = __pa(initrd_end);
206 initrd_end = (unsigned long)__va(end);
207 initrd_start = (unsigned long)__va(__pa(initrd_start));
208
209 ROOT_DEV = Root_RAM0;
210 return PFN_UP(end);
211disable:
212 initrd_start = 0;
213 initrd_end = 0;
214 return 0;
215}
216
217/* In some conditions (e.g. big endian bootloader with a little endian
218 kernel), the initrd might appear byte swapped. Try to detect this and
219 byte swap it if needed. */
220static void __init maybe_bswap_initrd(void)
221{
222#if defined(CONFIG_CPU_CAVIUM_OCTEON)
223 u64 buf;
224
225 /* Check for CPIO signature */
226 if (!memcmp((void *)initrd_start, "070701", 6))
227 return;
228
229 /* Check for compressed initrd */
230 if (decompress_method((unsigned char *)initrd_start, 8, NULL))
231 return;
232
233 /* Try again with a byte swapped header */
234 buf = swab64p((u64 *)initrd_start);
235 if (!memcmp(&buf, "070701", 6) ||
236 decompress_method((unsigned char *)(&buf), 8, NULL)) {
237 unsigned long i;
238
239 pr_info("Byteswapped initrd detected\n");
240 for (i = initrd_start; i < ALIGN(initrd_end, 8); i += 8)
241 swab64s((u64 *)i);
242 }
243#endif
244}
245
246static void __init finalize_initrd(void)
247{
248 unsigned long size = initrd_end - initrd_start;
249
250 if (size == 0) {
251 printk(KERN_INFO "Initrd not found or empty");
252 goto disable;
253 }
254 if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
255 printk(KERN_ERR "Initrd extends beyond end of memory");
256 goto disable;
257 }
258
259 maybe_bswap_initrd();
260
261 memblock_reserve(__pa(initrd_start), size);
262 initrd_below_start_ok = 1;
263
264 pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",
265 initrd_start, size);
266 return;
267disable:
268 printk(KERN_CONT " - disabling initrd\n");
269 initrd_start = 0;
270 initrd_end = 0;
271}
272
273#else /* !CONFIG_BLK_DEV_INITRD */
274
275static unsigned long __init init_initrd(void)
276{
277 return 0;
278}
279
280#define finalize_initrd() do {} while (0)
281
282#endif
283
284/*
285 * Initialize the bootmem allocator. It also setup initrd related data
286 * if needed.
287 */
288#if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON3) && defined(CONFIG_NUMA))
289
290static void __init bootmem_init(void)
291{
292 init_initrd();
293 finalize_initrd();
294}
295
296#else /* !CONFIG_SGI_IP27 */
297
298static void __init bootmem_init(void)
299{
300 struct memblock_region *mem;
301 phys_addr_t ramstart, ramend;
302
303 ramstart = memblock_start_of_DRAM();
304 ramend = memblock_end_of_DRAM();
305
306 /*
307 * Sanity check any INITRD first. We don't take it into account
308 * for bootmem setup initially, rely on the end-of-kernel-code
309 * as our memory range starting point. Once bootmem is inited we
310 * will reserve the area used for the initrd.
311 */
312 init_initrd();
313
314 /* Reserve memory occupied by kernel. */
315 memblock_reserve(__pa_symbol(&_text),
316 __pa_symbol(&_end) - __pa_symbol(&_text));
317
318 /* max_low_pfn is not a number of pages but the end pfn of low mem */
319
320#ifdef CONFIG_MIPS_AUTO_PFN_OFFSET
321 ARCH_PFN_OFFSET = PFN_UP(ramstart);
322#else
323 /*
324 * Reserve any memory between the start of RAM and PHYS_OFFSET
325 */
326 if (ramstart > PHYS_OFFSET)
327 memblock_reserve(PHYS_OFFSET, ramstart - PHYS_OFFSET);
328
329 if (PFN_UP(ramstart) > ARCH_PFN_OFFSET) {
330 pr_info("Wasting %lu bytes for tracking %lu unused pages\n",
331 (unsigned long)((PFN_UP(ramstart) - ARCH_PFN_OFFSET) * sizeof(struct page)),
332 (unsigned long)(PFN_UP(ramstart) - ARCH_PFN_OFFSET));
333 }
334#endif
335
336 min_low_pfn = ARCH_PFN_OFFSET;
337 max_pfn = PFN_DOWN(ramend);
338 for_each_memblock(memory, mem) {
339 unsigned long start = memblock_region_memory_base_pfn(mem);
340 unsigned long end = memblock_region_memory_end_pfn(mem);
341
342 /*
343 * Skip highmem here so we get an accurate max_low_pfn if low
344 * memory stops short of high memory.
345 * If the region overlaps HIGHMEM_START, end is clipped so
346 * max_pfn excludes the highmem portion.
347 */
348 if (memblock_is_nomap(mem))
349 continue;
350 if (start >= PFN_DOWN(HIGHMEM_START))
351 continue;
352 if (end > PFN_DOWN(HIGHMEM_START))
353 end = PFN_DOWN(HIGHMEM_START);
354 if (end > max_low_pfn)
355 max_low_pfn = end;
356 }
357
358 if (min_low_pfn >= max_low_pfn)
359 panic("Incorrect memory mapping !!!");
360
361 if (max_pfn > PFN_DOWN(HIGHMEM_START)) {
362#ifdef CONFIG_HIGHMEM
363 highstart_pfn = PFN_DOWN(HIGHMEM_START);
364 highend_pfn = max_pfn;
365#else
366 max_low_pfn = PFN_DOWN(HIGHMEM_START);
367 max_pfn = max_low_pfn;
368#endif
369 }
370
371
372 /*
373 * In any case the added to the memblock memory regions
374 * (highmem/lowmem, available/reserved, etc) are considered
375 * as present, so inform sparsemem about them.
376 */
377 memblocks_present();
378
379 /*
380 * Reserve initrd memory if needed.
381 */
382 finalize_initrd();
383}
384
385#endif /* CONFIG_SGI_IP27 */
386
387static int usermem __initdata;
388
389static int __init early_parse_mem(char *p)
390{
391 phys_addr_t start, size;
392
393 /*
394 * If a user specifies memory size, we
395 * blow away any automatically generated
396 * size.
397 */
398 if (usermem == 0) {
399 usermem = 1;
400 memblock_remove(memblock_start_of_DRAM(),
401 memblock_end_of_DRAM() - memblock_start_of_DRAM());
402 }
403 start = 0;
404 size = memparse(p, &p);
405 if (*p == '@')
406 start = memparse(p + 1, &p);
407
408 add_memory_region(start, size, BOOT_MEM_RAM);
409
410 return 0;
411}
412early_param("mem", early_parse_mem);
413
414static int __init early_parse_memmap(char *p)
415{
416 char *oldp;
417 u64 start_at, mem_size;
418
419 if (!p)
420 return -EINVAL;
421
422 if (!strncmp(p, "exactmap", 8)) {
423 pr_err("\"memmap=exactmap\" invalid on MIPS\n");
424 return 0;
425 }
426
427 oldp = p;
428 mem_size = memparse(p, &p);
429 if (p == oldp)
430 return -EINVAL;
431
432 if (*p == '@') {
433 start_at = memparse(p+1, &p);
434 add_memory_region(start_at, mem_size, BOOT_MEM_RAM);
435 } else if (*p == '#') {
436 pr_err("\"memmap=nn#ss\" (force ACPI data) invalid on MIPS\n");
437 return -EINVAL;
438 } else if (*p == '$') {
439 start_at = memparse(p+1, &p);
440 add_memory_region(start_at, mem_size, BOOT_MEM_RESERVED);
441 } else {
442 pr_err("\"memmap\" invalid format!\n");
443 return -EINVAL;
444 }
445
446 if (*p == '\0') {
447 usermem = 1;
448 return 0;
449 } else
450 return -EINVAL;
451}
452early_param("memmap", early_parse_memmap);
453
454#ifdef CONFIG_PROC_VMCORE
455unsigned long setup_elfcorehdr, setup_elfcorehdr_size;
456static int __init early_parse_elfcorehdr(char *p)
457{
458 struct memblock_region *mem;
459
460 setup_elfcorehdr = memparse(p, &p);
461
462 for_each_memblock(memory, mem) {
463 unsigned long start = mem->base;
464 unsigned long end = start + mem->size;
465 if (setup_elfcorehdr >= start && setup_elfcorehdr < end) {
466 /*
467 * Reserve from the elf core header to the end of
468 * the memory segment, that should all be kdump
469 * reserved memory.
470 */
471 setup_elfcorehdr_size = end - setup_elfcorehdr;
472 break;
473 }
474 }
475 /*
476 * If we don't find it in the memory map, then we shouldn't
477 * have to worry about it, as the new kernel won't use it.
478 */
479 return 0;
480}
481early_param("elfcorehdr", early_parse_elfcorehdr);
482#endif
483
484#ifdef CONFIG_KEXEC
485static void __init mips_parse_crashkernel(void)
486{
487 unsigned long long total_mem;
488 unsigned long long crash_size, crash_base;
489 int ret;
490
491 total_mem = memblock_phys_mem_size();
492 ret = parse_crashkernel(boot_command_line, total_mem,
493 &crash_size, &crash_base);
494 if (ret != 0 || crash_size <= 0)
495 return;
496
497 if (!memblock_find_in_range(crash_base, crash_base + crash_size, crash_size, 0)) {
498 pr_warn("Invalid memory region reserved for crash kernel\n");
499 return;
500 }
501
502 crashk_res.start = crash_base;
503 crashk_res.end = crash_base + crash_size - 1;
504}
505
506static void __init request_crashkernel(struct resource *res)
507{
508 int ret;
509
510 if (crashk_res.start == crashk_res.end)
511 return;
512
513 ret = request_resource(res, &crashk_res);
514 if (!ret)
515 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",
516 (unsigned long)((crashk_res.end -
517 crashk_res.start + 1) >> 20),
518 (unsigned long)(crashk_res.start >> 20));
519}
520#else /* !defined(CONFIG_KEXEC) */
521static void __init mips_parse_crashkernel(void)
522{
523}
524
525static void __init request_crashkernel(struct resource *res)
526{
527}
528#endif /* !defined(CONFIG_KEXEC) */
529
530static void __init check_kernel_sections_mem(void)
531{
532 phys_addr_t start = PFN_PHYS(PFN_DOWN(__pa_symbol(&_text)));
533 phys_addr_t size = PFN_PHYS(PFN_UP(__pa_symbol(&_end))) - start;
534
535 if (!memblock_is_region_memory(start, size)) {
536 pr_info("Kernel sections are not in the memory maps\n");
537 memblock_add(start, size);
538 }
539}
540
541#define USE_PROM_CMDLINE IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_BOOTLOADER)
542#define USE_DTB_CMDLINE IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_DTB)
543#define EXTEND_WITH_PROM IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND)
544#define BUILTIN_EXTEND_WITH_PROM \
545 IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND)
546
547/*
548 * arch_mem_init - initialize memory management subsystem
549 *
550 * o plat_mem_setup() detects the memory configuration and will record detected
551 * memory areas using add_memory_region.
552 *
553 * At this stage the memory configuration of the system is known to the
554 * kernel but generic memory management system is still entirely uninitialized.
555 *
556 * o bootmem_init()
557 * o sparse_init()
558 * o paging_init()
559 * o dma_contiguous_reserve()
560 *
561 * At this stage the bootmem allocator is ready to use.
562 *
563 * NOTE: historically plat_mem_setup did the entire platform initialization.
564 * This was rather impractical because it meant plat_mem_setup had to
565 * get away without any kind of memory allocator. To keep old code from
566 * breaking plat_setup was just renamed to plat_mem_setup and a second platform
567 * initialization hook for anything else was introduced.
568 */
569static void __init arch_mem_init(char **cmdline_p)
570{
571 extern void plat_mem_setup(void);
572
573 /*
574 * Initialize boot_command_line to an innocuous but non-empty string in
575 * order to prevent early_init_dt_scan_chosen() from copying
576 * CONFIG_CMDLINE into it without our knowledge. We handle
577 * CONFIG_CMDLINE ourselves below & don't want to duplicate its
578 * content because repeating arguments can be problematic.
579 */
580 strlcpy(boot_command_line, " ", COMMAND_LINE_SIZE);
581
582 /* call board setup routine */
583 plat_mem_setup();
584 memblock_set_bottom_up(true);
585
586#if defined(CONFIG_CMDLINE_BOOL) && defined(CONFIG_CMDLINE_OVERRIDE)
587 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
588#else
589 if ((USE_PROM_CMDLINE && arcs_cmdline[0]) ||
590 (USE_DTB_CMDLINE && !boot_command_line[0]))
591 strlcpy(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
592
593 if (EXTEND_WITH_PROM && arcs_cmdline[0]) {
594 if (boot_command_line[0])
595 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
596 strlcat(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
597 }
598
599#if defined(CONFIG_CMDLINE_BOOL)
600 if (builtin_cmdline[0]) {
601 if (boot_command_line[0])
602 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
603 strlcat(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
604 }
605
606 if (BUILTIN_EXTEND_WITH_PROM && arcs_cmdline[0]) {
607 if (boot_command_line[0])
608 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
609 strlcat(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
610 }
611#endif
612#endif
613 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
614
615 *cmdline_p = command_line;
616
617 parse_early_param();
618
619 if (usermem)
620 pr_info("User-defined physical RAM map overwrite\n");
621
622 check_kernel_sections_mem();
623
624 early_init_fdt_reserve_self();
625 early_init_fdt_scan_reserved_mem();
626
627#ifndef CONFIG_NUMA
628 memblock_set_node(0, PHYS_ADDR_MAX, &memblock.memory, 0);
629#endif
630 bootmem_init();
631
632 /*
633 * Prevent memblock from allocating high memory.
634 * This cannot be done before max_low_pfn is detected, so up
635 * to this point is possible to only reserve physical memory
636 * with memblock_reserve; memblock_alloc* can be used
637 * only after this point
638 */
639 memblock_set_current_limit(PFN_PHYS(max_low_pfn));
640
641#ifdef CONFIG_PROC_VMCORE
642 if (setup_elfcorehdr && setup_elfcorehdr_size) {
643 printk(KERN_INFO "kdump reserved memory at %lx-%lx\n",
644 setup_elfcorehdr, setup_elfcorehdr_size);
645 memblock_reserve(setup_elfcorehdr, setup_elfcorehdr_size);
646 }
647#endif
648
649 mips_parse_crashkernel();
650#ifdef CONFIG_KEXEC
651 if (crashk_res.start != crashk_res.end)
652 memblock_reserve(crashk_res.start,
653 crashk_res.end - crashk_res.start + 1);
654#endif
655 device_tree_init();
656 sparse_init();
657 plat_swiotlb_setup();
658
659 dma_contiguous_reserve(PFN_PHYS(max_low_pfn));
660
661 /* Reserve for hibernation. */
662 memblock_reserve(__pa_symbol(&__nosave_begin),
663 __pa_symbol(&__nosave_end) - __pa_symbol(&__nosave_begin));
664
665 fdt_init_reserved_mem();
666
667 memblock_dump_all();
668
669 early_memtest(PFN_PHYS(ARCH_PFN_OFFSET), PFN_PHYS(max_low_pfn));
670}
671
672static void __init resource_init(void)
673{
674 struct memblock_region *region;
675
676 if (UNCAC_BASE != IO_BASE)
677 return;
678
679 code_resource.start = __pa_symbol(&_text);
680 code_resource.end = __pa_symbol(&_etext) - 1;
681 data_resource.start = __pa_symbol(&_etext);
682 data_resource.end = __pa_symbol(&_edata) - 1;
683 bss_resource.start = __pa_symbol(&__bss_start);
684 bss_resource.end = __pa_symbol(&__bss_stop) - 1;
685
686 for_each_memblock(memory, region) {
687 phys_addr_t start = PFN_PHYS(memblock_region_memory_base_pfn(region));
688 phys_addr_t end = PFN_PHYS(memblock_region_memory_end_pfn(region)) - 1;
689 struct resource *res;
690
691 res = memblock_alloc(sizeof(struct resource), SMP_CACHE_BYTES);
692 if (!res)
693 panic("%s: Failed to allocate %zu bytes\n", __func__,
694 sizeof(struct resource));
695
696 res->start = start;
697 res->end = end;
698 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
699 res->name = "System RAM";
700
701 request_resource(&iomem_resource, res);
702
703 /*
704 * We don't know which RAM region contains kernel data,
705 * so we try it repeatedly and let the resource manager
706 * test it.
707 */
708 request_resource(res, &code_resource);
709 request_resource(res, &data_resource);
710 request_resource(res, &bss_resource);
711 request_crashkernel(res);
712 }
713}
714
715#ifdef CONFIG_SMP
716static void __init prefill_possible_map(void)
717{
718 int i, possible = num_possible_cpus();
719
720 if (possible > nr_cpu_ids)
721 possible = nr_cpu_ids;
722
723 for (i = 0; i < possible; i++)
724 set_cpu_possible(i, true);
725 for (; i < NR_CPUS; i++)
726 set_cpu_possible(i, false);
727
728 nr_cpu_ids = possible;
729}
730#else
731static inline void prefill_possible_map(void) {}
732#endif
733
734void __init setup_arch(char **cmdline_p)
735{
736 cpu_probe();
737 mips_cm_probe();
738 prom_init();
739
740 setup_early_fdc_console();
741#ifdef CONFIG_EARLY_PRINTK
742 setup_early_printk();
743#endif
744 cpu_report();
745 check_bugs_early();
746
747#if defined(CONFIG_VT)
748#if defined(CONFIG_VGA_CONSOLE)
749 conswitchp = &vga_con;
750#elif defined(CONFIG_DUMMY_CONSOLE)
751 conswitchp = &dummy_con;
752#endif
753#endif
754
755 arch_mem_init(cmdline_p);
756
757 resource_init();
758 plat_smp_setup();
759 prefill_possible_map();
760
761 cpu_cache_init();
762 paging_init();
763}
764
765unsigned long kernelsp[NR_CPUS];
766unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
767
768#ifdef CONFIG_USE_OF
769unsigned long fw_passed_dtb;
770#endif
771
772#ifdef CONFIG_DEBUG_FS
773struct dentry *mips_debugfs_dir;
774static int __init debugfs_mips(void)
775{
776 mips_debugfs_dir = debugfs_create_dir("mips", NULL);
777 return 0;
778}
779arch_initcall(debugfs_mips);
780#endif
781
782#ifdef CONFIG_DMA_MAYBE_COHERENT
783/* User defined DMA coherency from command line. */
784enum coherent_io_user_state coherentio = IO_COHERENCE_DEFAULT;
785EXPORT_SYMBOL_GPL(coherentio);
786int hw_coherentio = 0; /* Actual hardware supported DMA coherency setting. */
787
788static int __init setcoherentio(char *str)
789{
790 coherentio = IO_COHERENCE_ENABLED;
791 pr_info("Hardware DMA cache coherency (command line)\n");
792 return 0;
793}
794early_param("coherentio", setcoherentio);
795
796static int __init setnocoherentio(char *str)
797{
798 coherentio = IO_COHERENCE_DISABLED;
799 pr_info("Software DMA cache coherency (command line)\n");
800 return 0;
801}
802early_param("nocoherentio", setnocoherentio);
803#endif
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/ioport.h>
15#include <linux/export.h>
16#include <linux/screen_info.h>
17#include <linux/memblock.h>
18#include <linux/initrd.h>
19#include <linux/root_dev.h>
20#include <linux/highmem.h>
21#include <linux/console.h>
22#include <linux/pfn.h>
23#include <linux/debugfs.h>
24#include <linux/kexec.h>
25#include <linux/sizes.h>
26#include <linux/device.h>
27#include <linux/dma-map-ops.h>
28#include <linux/decompress/generic.h>
29#include <linux/of_fdt.h>
30#include <linux/dmi.h>
31#include <linux/crash_dump.h>
32
33#include <asm/addrspace.h>
34#include <asm/bootinfo.h>
35#include <asm/bugs.h>
36#include <asm/cache.h>
37#include <asm/cdmm.h>
38#include <asm/cpu.h>
39#include <asm/debug.h>
40#include <asm/sections.h>
41#include <asm/setup.h>
42#include <asm/smp-ops.h>
43#include <asm/prom.h>
44
45#ifdef CONFIG_MIPS_ELF_APPENDED_DTB
46char __section(".appended_dtb") __appended_dtb[0x100000];
47#endif /* CONFIG_MIPS_ELF_APPENDED_DTB */
48
49struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;
50
51EXPORT_SYMBOL(cpu_data);
52
53#ifdef CONFIG_VT
54struct screen_info screen_info;
55#endif
56
57/*
58 * Setup information
59 *
60 * These are initialized so they are in the .data section
61 */
62unsigned long mips_machtype __read_mostly = MACH_UNKNOWN;
63
64EXPORT_SYMBOL(mips_machtype);
65
66static char __initdata command_line[COMMAND_LINE_SIZE];
67char __initdata arcs_cmdline[COMMAND_LINE_SIZE];
68
69#ifdef CONFIG_CMDLINE_BOOL
70static const char builtin_cmdline[] __initconst = CONFIG_CMDLINE;
71#else
72static const char builtin_cmdline[] __initconst = "";
73#endif
74
75/*
76 * mips_io_port_base is the begin of the address space to which x86 style
77 * I/O ports are mapped.
78 */
79unsigned long mips_io_port_base = -1;
80EXPORT_SYMBOL(mips_io_port_base);
81
82static struct resource code_resource = { .name = "Kernel code", };
83static struct resource data_resource = { .name = "Kernel data", };
84static struct resource bss_resource = { .name = "Kernel bss", };
85
86unsigned long __kaslr_offset __ro_after_init;
87EXPORT_SYMBOL(__kaslr_offset);
88
89static void *detect_magic __initdata = detect_memory_region;
90
91#ifdef CONFIG_MIPS_AUTO_PFN_OFFSET
92unsigned long ARCH_PFN_OFFSET;
93EXPORT_SYMBOL(ARCH_PFN_OFFSET);
94#endif
95
96void __init detect_memory_region(phys_addr_t start, phys_addr_t sz_min, phys_addr_t sz_max)
97{
98 void *dm = &detect_magic;
99 phys_addr_t size;
100
101 for (size = sz_min; size < sz_max; size <<= 1) {
102 if (!memcmp(dm, dm + size, sizeof(detect_magic)))
103 break;
104 }
105
106 pr_debug("Memory: %lluMB of RAM detected at 0x%llx (min: %lluMB, max: %lluMB)\n",
107 ((unsigned long long) size) / SZ_1M,
108 (unsigned long long) start,
109 ((unsigned long long) sz_min) / SZ_1M,
110 ((unsigned long long) sz_max) / SZ_1M);
111
112 memblock_add(start, size);
113}
114
115/*
116 * Manage initrd
117 */
118#ifdef CONFIG_BLK_DEV_INITRD
119
120static int __init rd_start_early(char *p)
121{
122 unsigned long start = memparse(p, &p);
123
124#ifdef CONFIG_64BIT
125 /* Guess if the sign extension was forgotten by bootloader */
126 if (start < XKPHYS)
127 start = (int)start;
128#endif
129 initrd_start = start;
130 initrd_end += start;
131 return 0;
132}
133early_param("rd_start", rd_start_early);
134
135static int __init rd_size_early(char *p)
136{
137 initrd_end += memparse(p, &p);
138 return 0;
139}
140early_param("rd_size", rd_size_early);
141
142/* it returns the next free pfn after initrd */
143static unsigned long __init init_initrd(void)
144{
145 unsigned long end;
146
147 /*
148 * Board specific code or command line parser should have
149 * already set up initrd_start and initrd_end. In these cases
150 * perfom sanity checks and use them if all looks good.
151 */
152 if (!initrd_start || initrd_end <= initrd_start)
153 goto disable;
154
155 if (initrd_start & ~PAGE_MASK) {
156 pr_err("initrd start must be page aligned\n");
157 goto disable;
158 }
159 if (initrd_start < PAGE_OFFSET) {
160 pr_err("initrd start < PAGE_OFFSET\n");
161 goto disable;
162 }
163
164 /*
165 * Sanitize initrd addresses. For example firmware
166 * can't guess if they need to pass them through
167 * 64-bits values if the kernel has been built in pure
168 * 32-bit. We need also to switch from KSEG0 to XKPHYS
169 * addresses now, so the code can now safely use __pa().
170 */
171 end = __pa(initrd_end);
172 initrd_end = (unsigned long)__va(end);
173 initrd_start = (unsigned long)__va(__pa(initrd_start));
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(PHYS_OFFSET, 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("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 /*
348 * If a user specifies memory size, we
349 * blow away any automatically generated
350 * size.
351 */
352 if (usermem == 0) {
353 usermem = 1;
354 memblock_remove(memblock_start_of_DRAM(),
355 memblock_end_of_DRAM() - memblock_start_of_DRAM());
356 }
357 start = 0;
358 size = memparse(p, &p);
359 if (*p == '@')
360 start = memparse(p + 1, &p);
361
362 memblock_add(start, size);
363
364 return 0;
365}
366early_param("mem", early_parse_mem);
367
368static int __init early_parse_memmap(char *p)
369{
370 char *oldp;
371 u64 start_at, mem_size;
372
373 if (!p)
374 return -EINVAL;
375
376 if (!strncmp(p, "exactmap", 8)) {
377 pr_err("\"memmap=exactmap\" invalid on MIPS\n");
378 return 0;
379 }
380
381 oldp = p;
382 mem_size = memparse(p, &p);
383 if (p == oldp)
384 return -EINVAL;
385
386 if (*p == '@') {
387 start_at = memparse(p+1, &p);
388 memblock_add(start_at, mem_size);
389 } else if (*p == '#') {
390 pr_err("\"memmap=nn#ss\" (force ACPI data) invalid on MIPS\n");
391 return -EINVAL;
392 } else if (*p == '$') {
393 start_at = memparse(p+1, &p);
394 memblock_add(start_at, mem_size);
395 memblock_reserve(start_at, mem_size);
396 } else {
397 pr_err("\"memmap\" invalid format!\n");
398 return -EINVAL;
399 }
400
401 if (*p == '\0') {
402 usermem = 1;
403 return 0;
404 } else
405 return -EINVAL;
406}
407early_param("memmap", early_parse_memmap);
408
409static void __init mips_reserve_vmcore(void)
410{
411#ifdef CONFIG_PROC_VMCORE
412 phys_addr_t start, end;
413 u64 i;
414
415 if (!elfcorehdr_size) {
416 for_each_mem_range(i, &start, &end) {
417 if (elfcorehdr_addr >= start && elfcorehdr_addr < end) {
418 /*
419 * Reserve from the elf core header to the end of
420 * the memory segment, that should all be kdump
421 * reserved memory.
422 */
423 elfcorehdr_size = end - elfcorehdr_addr;
424 break;
425 }
426 }
427 }
428
429 pr_info("Reserving %ldKB of memory at %ldKB for kdump\n",
430 (unsigned long)elfcorehdr_size >> 10, (unsigned long)elfcorehdr_addr >> 10);
431
432 memblock_reserve(elfcorehdr_addr, elfcorehdr_size);
433#endif
434}
435
436#ifdef CONFIG_KEXEC
437
438/* 64M alignment for crash kernel regions */
439#define CRASH_ALIGN SZ_64M
440#define CRASH_ADDR_MAX SZ_512M
441
442static void __init mips_parse_crashkernel(void)
443{
444 unsigned long long total_mem;
445 unsigned long long crash_size, crash_base;
446 int ret;
447
448 total_mem = memblock_phys_mem_size();
449 ret = parse_crashkernel(boot_command_line, total_mem,
450 &crash_size, &crash_base);
451 if (ret != 0 || crash_size <= 0)
452 return;
453
454 if (crash_base <= 0) {
455 crash_base = memblock_find_in_range(CRASH_ALIGN, CRASH_ADDR_MAX,
456 crash_size, CRASH_ALIGN);
457 if (!crash_base) {
458 pr_warn("crashkernel reservation failed - No suitable area found.\n");
459 return;
460 }
461 } else {
462 unsigned long long start;
463
464 start = memblock_find_in_range(crash_base, crash_base + crash_size,
465 crash_size, 1);
466 if (start != crash_base) {
467 pr_warn("Invalid memory region reserved for crash kernel\n");
468 return;
469 }
470 }
471
472 crashk_res.start = crash_base;
473 crashk_res.end = crash_base + crash_size - 1;
474}
475
476static void __init request_crashkernel(struct resource *res)
477{
478 int ret;
479
480 if (crashk_res.start == crashk_res.end)
481 return;
482
483 ret = request_resource(res, &crashk_res);
484 if (!ret)
485 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",
486 (unsigned long)(resource_size(&crashk_res) >> 20),
487 (unsigned long)(crashk_res.start >> 20));
488}
489#else /* !defined(CONFIG_KEXEC) */
490static void __init mips_parse_crashkernel(void)
491{
492}
493
494static void __init request_crashkernel(struct resource *res)
495{
496}
497#endif /* !defined(CONFIG_KEXEC) */
498
499static void __init check_kernel_sections_mem(void)
500{
501 phys_addr_t start = __pa_symbol(&_text);
502 phys_addr_t size = __pa_symbol(&_end) - start;
503
504 if (!memblock_is_region_memory(start, size)) {
505 pr_info("Kernel sections are not in the memory maps\n");
506 memblock_add(start, size);
507 }
508}
509
510static void __init bootcmdline_append(const char *s, size_t max)
511{
512 if (!s[0] || !max)
513 return;
514
515 if (boot_command_line[0])
516 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
517
518 strlcat(boot_command_line, s, max);
519}
520
521#ifdef CONFIG_OF_EARLY_FLATTREE
522
523static int __init bootcmdline_scan_chosen(unsigned long node, const char *uname,
524 int depth, void *data)
525{
526 bool *dt_bootargs = data;
527 const char *p;
528 int l;
529
530 if (depth != 1 || !data ||
531 (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0))
532 return 0;
533
534 p = of_get_flat_dt_prop(node, "bootargs", &l);
535 if (p != NULL && l > 0) {
536 bootcmdline_append(p, min(l, COMMAND_LINE_SIZE));
537 *dt_bootargs = true;
538 }
539
540 return 1;
541}
542
543#endif /* CONFIG_OF_EARLY_FLATTREE */
544
545static void __init bootcmdline_init(void)
546{
547 bool dt_bootargs = false;
548
549 /*
550 * If CMDLINE_OVERRIDE is enabled then initializing the command line is
551 * trivial - we simply use the built-in command line unconditionally &
552 * unmodified.
553 */
554 if (IS_ENABLED(CONFIG_CMDLINE_OVERRIDE)) {
555 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
556 return;
557 }
558
559 /*
560 * If the user specified a built-in command line &
561 * MIPS_CMDLINE_BUILTIN_EXTEND, then the built-in command line is
562 * prepended to arguments from the bootloader or DT so we'll copy them
563 * to the start of boot_command_line here. Otherwise, empty
564 * boot_command_line to undo anything early_init_dt_scan_chosen() did.
565 */
566 if (IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND))
567 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
568 else
569 boot_command_line[0] = 0;
570
571#ifdef CONFIG_OF_EARLY_FLATTREE
572 /*
573 * If we're configured to take boot arguments from DT, look for those
574 * now.
575 */
576 if (IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_DTB) ||
577 IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND))
578 of_scan_flat_dt(bootcmdline_scan_chosen, &dt_bootargs);
579#endif
580
581 /*
582 * If we didn't get any arguments from DT (regardless of whether that's
583 * because we weren't configured to look for them, or because we looked
584 * & found none) then we'll take arguments from the bootloader.
585 * plat_mem_setup() should have filled arcs_cmdline with arguments from
586 * the bootloader.
587 */
588 if (IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND) || !dt_bootargs)
589 bootcmdline_append(arcs_cmdline, COMMAND_LINE_SIZE);
590
591 /*
592 * If the user specified a built-in command line & we didn't already
593 * prepend it, we append it to boot_command_line here.
594 */
595 if (IS_ENABLED(CONFIG_CMDLINE_BOOL) &&
596 !IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND))
597 bootcmdline_append(builtin_cmdline, COMMAND_LINE_SIZE);
598}
599
600/*
601 * arch_mem_init - initialize memory management subsystem
602 *
603 * o plat_mem_setup() detects the memory configuration and will record detected
604 * memory areas using memblock_add.
605 *
606 * At this stage the memory configuration of the system is known to the
607 * kernel but generic memory management system is still entirely uninitialized.
608 *
609 * o bootmem_init()
610 * o sparse_init()
611 * o paging_init()
612 * o dma_contiguous_reserve()
613 *
614 * At this stage the bootmem allocator is ready to use.
615 *
616 * NOTE: historically plat_mem_setup did the entire platform initialization.
617 * This was rather impractical because it meant plat_mem_setup had to
618 * get away without any kind of memory allocator. To keep old code from
619 * breaking plat_setup was just renamed to plat_mem_setup and a second platform
620 * initialization hook for anything else was introduced.
621 */
622static void __init arch_mem_init(char **cmdline_p)
623{
624 /* call board setup routine */
625 plat_mem_setup();
626 memblock_set_bottom_up(true);
627
628 bootcmdline_init();
629 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
630 *cmdline_p = command_line;
631
632 parse_early_param();
633
634 if (usermem)
635 pr_info("User-defined physical RAM map overwrite\n");
636
637 check_kernel_sections_mem();
638
639 early_init_fdt_reserve_self();
640 early_init_fdt_scan_reserved_mem();
641
642#ifndef CONFIG_NUMA
643 memblock_set_node(0, PHYS_ADDR_MAX, &memblock.memory, 0);
644#endif
645 bootmem_init();
646
647 /*
648 * Prevent memblock from allocating high memory.
649 * This cannot be done before max_low_pfn is detected, so up
650 * to this point is possible to only reserve physical memory
651 * with memblock_reserve; memblock_alloc* can be used
652 * only after this point
653 */
654 memblock_set_current_limit(PFN_PHYS(max_low_pfn));
655
656 mips_reserve_vmcore();
657
658 mips_parse_crashkernel();
659#ifdef CONFIG_KEXEC
660 if (crashk_res.start != crashk_res.end)
661 memblock_reserve(crashk_res.start, resource_size(&crashk_res));
662#endif
663 device_tree_init();
664
665 /*
666 * In order to reduce the possibility of kernel panic when failed to
667 * get IO TLB memory under CONFIG_SWIOTLB, it is better to allocate
668 * low memory as small as possible before plat_swiotlb_setup(), so
669 * make sparse_init() using top-down allocation.
670 */
671 memblock_set_bottom_up(false);
672 sparse_init();
673 memblock_set_bottom_up(true);
674
675 plat_swiotlb_setup();
676
677 dma_contiguous_reserve(PFN_PHYS(max_low_pfn));
678
679 /* Reserve for hibernation. */
680 memblock_reserve(__pa_symbol(&__nosave_begin),
681 __pa_symbol(&__nosave_end) - __pa_symbol(&__nosave_begin));
682
683 early_memtest(PFN_PHYS(ARCH_PFN_OFFSET), PFN_PHYS(max_low_pfn));
684}
685
686static void __init resource_init(void)
687{
688 phys_addr_t start, end;
689 u64 i;
690
691 if (UNCAC_BASE != IO_BASE)
692 return;
693
694 code_resource.start = __pa_symbol(&_text);
695 code_resource.end = __pa_symbol(&_etext) - 1;
696 data_resource.start = __pa_symbol(&_etext);
697 data_resource.end = __pa_symbol(&_edata) - 1;
698 bss_resource.start = __pa_symbol(&__bss_start);
699 bss_resource.end = __pa_symbol(&__bss_stop) - 1;
700
701 for_each_mem_range(i, &start, &end) {
702 struct resource *res;
703
704 res = memblock_alloc(sizeof(struct resource), SMP_CACHE_BYTES);
705 if (!res)
706 panic("%s: Failed to allocate %zu bytes\n", __func__,
707 sizeof(struct resource));
708
709 res->start = start;
710 /*
711 * In memblock, end points to the first byte after the
712 * range while in resourses, end points to the last byte in
713 * the range.
714 */
715 res->end = end - 1;
716 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
717 res->name = "System RAM";
718
719 request_resource(&iomem_resource, res);
720
721 /*
722 * We don't know which RAM region contains kernel data,
723 * so we try it repeatedly and let the resource manager
724 * test it.
725 */
726 request_resource(res, &code_resource);
727 request_resource(res, &data_resource);
728 request_resource(res, &bss_resource);
729 request_crashkernel(res);
730 }
731}
732
733#ifdef CONFIG_SMP
734static void __init prefill_possible_map(void)
735{
736 int i, possible = num_possible_cpus();
737
738 if (possible > nr_cpu_ids)
739 possible = nr_cpu_ids;
740
741 for (i = 0; i < possible; i++)
742 set_cpu_possible(i, true);
743 for (; i < NR_CPUS; i++)
744 set_cpu_possible(i, false);
745
746 nr_cpu_ids = possible;
747}
748#else
749static inline void prefill_possible_map(void) {}
750#endif
751
752void __init setup_arch(char **cmdline_p)
753{
754 cpu_probe();
755 mips_cm_probe();
756 prom_init();
757
758 setup_early_fdc_console();
759#ifdef CONFIG_EARLY_PRINTK
760 setup_early_printk();
761#endif
762 cpu_report();
763 check_bugs_early();
764
765#if defined(CONFIG_VT)
766#if defined(CONFIG_VGA_CONSOLE)
767 conswitchp = &vga_con;
768#endif
769#endif
770
771 arch_mem_init(cmdline_p);
772 dmi_setup();
773
774 resource_init();
775 plat_smp_setup();
776 prefill_possible_map();
777
778 cpu_cache_init();
779 paging_init();
780
781 memblock_dump_all();
782}
783
784unsigned long kernelsp[NR_CPUS];
785unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
786
787#ifdef CONFIG_DEBUG_FS
788struct dentry *mips_debugfs_dir;
789static int __init debugfs_mips(void)
790{
791 mips_debugfs_dir = debugfs_create_dir("mips", NULL);
792 return 0;
793}
794arch_initcall(debugfs_mips);
795#endif
796
797#ifdef CONFIG_DMA_NONCOHERENT
798static int __init setcoherentio(char *str)
799{
800 dma_default_coherent = true;
801 pr_info("Hardware DMA cache coherency (command line)\n");
802 return 0;
803}
804early_param("coherentio", setcoherentio);
805
806static int __init setnocoherentio(char *str)
807{
808 dma_default_coherent = true;
809 pr_info("Software DMA cache coherency (command line)\n");
810 return 0;
811}
812early_param("nocoherentio", setnocoherentio);
813#endif