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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/bootmem.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-contiguous.h>
29#include <linux/decompress/generic.h>
30#include <linux/of_fdt.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/sections.h>
40#include <asm/setup.h>
41#include <asm/smp-ops.h>
42#include <asm/prom.h>
43
44#ifdef CONFIG_MIPS_ELF_APPENDED_DTB
45const char __section(.appended_dtb) __appended_dtb[0x100000];
46#endif /* CONFIG_MIPS_ELF_APPENDED_DTB */
47
48struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;
49
50EXPORT_SYMBOL(cpu_data);
51
52#ifdef CONFIG_VT
53struct screen_info screen_info;
54#endif
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
65struct boot_mem_map boot_mem_map;
66
67static char __initdata command_line[COMMAND_LINE_SIZE];
68char __initdata arcs_cmdline[COMMAND_LINE_SIZE];
69
70#ifdef CONFIG_CMDLINE_BOOL
71static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
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 */
78const unsigned 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
85static void *detect_magic __initdata = detect_memory_region;
86
87void __init add_memory_region(phys_addr_t start, phys_addr_t size, long type)
88{
89 int x = boot_mem_map.nr_map;
90 int i;
91
92 /*
93 * If the region reaches the top of the physical address space, adjust
94 * the size slightly so that (start + size) doesn't overflow
95 */
96 if (start + size - 1 == (phys_addr_t)ULLONG_MAX)
97 --size;
98
99 /* Sanity check */
100 if (start + size < start) {
101 pr_warn("Trying to add an invalid memory region, skipped\n");
102 return;
103 }
104
105 /*
106 * Try to merge with existing entry, if any.
107 */
108 for (i = 0; i < boot_mem_map.nr_map; i++) {
109 struct boot_mem_map_entry *entry = boot_mem_map.map + i;
110 unsigned long top;
111
112 if (entry->type != type)
113 continue;
114
115 if (start + size < entry->addr)
116 continue; /* no overlap */
117
118 if (entry->addr + entry->size < start)
119 continue; /* no overlap */
120
121 top = max(entry->addr + entry->size, start + size);
122 entry->addr = min(entry->addr, start);
123 entry->size = top - entry->addr;
124
125 return;
126 }
127
128 if (boot_mem_map.nr_map == BOOT_MEM_MAP_MAX) {
129 pr_err("Ooops! Too many entries in the memory map!\n");
130 return;
131 }
132
133 boot_mem_map.map[x].addr = start;
134 boot_mem_map.map[x].size = size;
135 boot_mem_map.map[x].type = type;
136 boot_mem_map.nr_map++;
137}
138
139void __init detect_memory_region(phys_addr_t start, phys_addr_t sz_min, phys_addr_t sz_max)
140{
141 void *dm = &detect_magic;
142 phys_addr_t size;
143
144 for (size = sz_min; size < sz_max; size <<= 1) {
145 if (!memcmp(dm, dm + size, sizeof(detect_magic)))
146 break;
147 }
148
149 pr_debug("Memory: %lluMB of RAM detected at 0x%llx (min: %lluMB, max: %lluMB)\n",
150 ((unsigned long long) size) / SZ_1M,
151 (unsigned long long) start,
152 ((unsigned long long) sz_min) / SZ_1M,
153 ((unsigned long long) sz_max) / SZ_1M);
154
155 add_memory_region(start, size, BOOT_MEM_RAM);
156}
157
158static bool __init __maybe_unused memory_region_available(phys_addr_t start,
159 phys_addr_t size)
160{
161 int i;
162 bool in_ram = false, free = true;
163
164 for (i = 0; i < boot_mem_map.nr_map; i++) {
165 phys_addr_t start_, end_;
166
167 start_ = boot_mem_map.map[i].addr;
168 end_ = boot_mem_map.map[i].addr + boot_mem_map.map[i].size;
169
170 switch (boot_mem_map.map[i].type) {
171 case BOOT_MEM_RAM:
172 if (start >= start_ && start + size <= end_)
173 in_ram = true;
174 break;
175 case BOOT_MEM_RESERVED:
176 if ((start >= start_ && start < end_) ||
177 (start < start_ && start + size >= start_))
178 free = false;
179 break;
180 default:
181 continue;
182 }
183 }
184
185 return in_ram && free;
186}
187
188static void __init print_memory_map(void)
189{
190 int i;
191 const int field = 2 * sizeof(unsigned long);
192
193 for (i = 0; i < boot_mem_map.nr_map; i++) {
194 printk(KERN_INFO " memory: %0*Lx @ %0*Lx ",
195 field, (unsigned long long) boot_mem_map.map[i].size,
196 field, (unsigned long long) boot_mem_map.map[i].addr);
197
198 switch (boot_mem_map.map[i].type) {
199 case BOOT_MEM_RAM:
200 printk(KERN_CONT "(usable)\n");
201 break;
202 case BOOT_MEM_INIT_RAM:
203 printk(KERN_CONT "(usable after init)\n");
204 break;
205 case BOOT_MEM_ROM_DATA:
206 printk(KERN_CONT "(ROM data)\n");
207 break;
208 case BOOT_MEM_RESERVED:
209 printk(KERN_CONT "(reserved)\n");
210 break;
211 default:
212 printk(KERN_CONT "type %lu\n", boot_mem_map.map[i].type);
213 break;
214 }
215 }
216}
217
218/*
219 * Manage initrd
220 */
221#ifdef CONFIG_BLK_DEV_INITRD
222
223static int __init rd_start_early(char *p)
224{
225 unsigned long start = memparse(p, &p);
226
227#ifdef CONFIG_64BIT
228 /* Guess if the sign extension was forgotten by bootloader */
229 if (start < XKPHYS)
230 start = (int)start;
231#endif
232 initrd_start = start;
233 initrd_end += start;
234 return 0;
235}
236early_param("rd_start", rd_start_early);
237
238static int __init rd_size_early(char *p)
239{
240 initrd_end += memparse(p, &p);
241 return 0;
242}
243early_param("rd_size", rd_size_early);
244
245/* it returns the next free pfn after initrd */
246static unsigned long __init init_initrd(void)
247{
248 unsigned long end;
249
250 /*
251 * Board specific code or command line parser should have
252 * already set up initrd_start and initrd_end. In these cases
253 * perfom sanity checks and use them if all looks good.
254 */
255 if (!initrd_start || initrd_end <= initrd_start)
256 goto disable;
257
258 if (initrd_start & ~PAGE_MASK) {
259 pr_err("initrd start must be page aligned\n");
260 goto disable;
261 }
262 if (initrd_start < PAGE_OFFSET) {
263 pr_err("initrd start < PAGE_OFFSET\n");
264 goto disable;
265 }
266
267 /*
268 * Sanitize initrd addresses. For example firmware
269 * can't guess if they need to pass them through
270 * 64-bits values if the kernel has been built in pure
271 * 32-bit. We need also to switch from KSEG0 to XKPHYS
272 * addresses now, so the code can now safely use __pa().
273 */
274 end = __pa(initrd_end);
275 initrd_end = (unsigned long)__va(end);
276 initrd_start = (unsigned long)__va(__pa(initrd_start));
277
278 ROOT_DEV = Root_RAM0;
279 return PFN_UP(end);
280disable:
281 initrd_start = 0;
282 initrd_end = 0;
283 return 0;
284}
285
286/* In some conditions (e.g. big endian bootloader with a little endian
287 kernel), the initrd might appear byte swapped. Try to detect this and
288 byte swap it if needed. */
289static void __init maybe_bswap_initrd(void)
290{
291#if defined(CONFIG_CPU_CAVIUM_OCTEON)
292 u64 buf;
293
294 /* Check for CPIO signature */
295 if (!memcmp((void *)initrd_start, "070701", 6))
296 return;
297
298 /* Check for compressed initrd */
299 if (decompress_method((unsigned char *)initrd_start, 8, NULL))
300 return;
301
302 /* Try again with a byte swapped header */
303 buf = swab64p((u64 *)initrd_start);
304 if (!memcmp(&buf, "070701", 6) ||
305 decompress_method((unsigned char *)(&buf), 8, NULL)) {
306 unsigned long i;
307
308 pr_info("Byteswapped initrd detected\n");
309 for (i = initrd_start; i < ALIGN(initrd_end, 8); i += 8)
310 swab64s((u64 *)i);
311 }
312#endif
313}
314
315static void __init finalize_initrd(void)
316{
317 unsigned long size = initrd_end - initrd_start;
318
319 if (size == 0) {
320 printk(KERN_INFO "Initrd not found or empty");
321 goto disable;
322 }
323 if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
324 printk(KERN_ERR "Initrd extends beyond end of memory");
325 goto disable;
326 }
327
328 maybe_bswap_initrd();
329
330 reserve_bootmem(__pa(initrd_start), size, BOOTMEM_DEFAULT);
331 initrd_below_start_ok = 1;
332
333 pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",
334 initrd_start, size);
335 return;
336disable:
337 printk(KERN_CONT " - disabling initrd\n");
338 initrd_start = 0;
339 initrd_end = 0;
340}
341
342#else /* !CONFIG_BLK_DEV_INITRD */
343
344static unsigned long __init init_initrd(void)
345{
346 return 0;
347}
348
349#define finalize_initrd() do {} while (0)
350
351#endif
352
353/*
354 * Initialize the bootmem allocator. It also setup initrd related data
355 * if needed.
356 */
357#if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON3) && defined(CONFIG_NUMA))
358
359static void __init bootmem_init(void)
360{
361 init_initrd();
362 finalize_initrd();
363}
364
365#else /* !CONFIG_SGI_IP27 */
366
367static unsigned long __init bootmap_bytes(unsigned long pages)
368{
369 unsigned long bytes = DIV_ROUND_UP(pages, 8);
370
371 return ALIGN(bytes, sizeof(long));
372}
373
374static void __init bootmem_init(void)
375{
376 unsigned long reserved_end;
377 unsigned long mapstart = ~0UL;
378 unsigned long bootmap_size;
379 phys_addr_t ramstart = (phys_addr_t)ULLONG_MAX;
380 bool bootmap_valid = false;
381 int i;
382
383 /*
384 * Sanity check any INITRD first. We don't take it into account
385 * for bootmem setup initially, rely on the end-of-kernel-code
386 * as our memory range starting point. Once bootmem is inited we
387 * will reserve the area used for the initrd.
388 */
389 init_initrd();
390 reserved_end = (unsigned long) PFN_UP(__pa_symbol(&_end));
391
392 /*
393 * max_low_pfn is not a number of pages. The number of pages
394 * of the system is given by 'max_low_pfn - min_low_pfn'.
395 */
396 min_low_pfn = ~0UL;
397 max_low_pfn = 0;
398
399 /*
400 * Find the highest page frame number we have available
401 * and the lowest used RAM address
402 */
403 for (i = 0; i < boot_mem_map.nr_map; i++) {
404 unsigned long start, end;
405
406 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
407 continue;
408
409 start = PFN_UP(boot_mem_map.map[i].addr);
410 end = PFN_DOWN(boot_mem_map.map[i].addr
411 + boot_mem_map.map[i].size);
412
413 ramstart = min(ramstart, boot_mem_map.map[i].addr);
414
415#ifndef CONFIG_HIGHMEM
416 /*
417 * Skip highmem here so we get an accurate max_low_pfn if low
418 * memory stops short of high memory.
419 * If the region overlaps HIGHMEM_START, end is clipped so
420 * max_pfn excludes the highmem portion.
421 */
422 if (start >= PFN_DOWN(HIGHMEM_START))
423 continue;
424 if (end > PFN_DOWN(HIGHMEM_START))
425 end = PFN_DOWN(HIGHMEM_START);
426#endif
427
428 if (end > max_low_pfn)
429 max_low_pfn = end;
430 if (start < min_low_pfn)
431 min_low_pfn = start;
432 if (end <= reserved_end)
433 continue;
434#ifdef CONFIG_BLK_DEV_INITRD
435 /* Skip zones before initrd and initrd itself */
436 if (initrd_end && end <= (unsigned long)PFN_UP(__pa(initrd_end)))
437 continue;
438#endif
439 if (start >= mapstart)
440 continue;
441 mapstart = max(reserved_end, start);
442 }
443
444 /*
445 * Reserve any memory between the start of RAM and PHYS_OFFSET
446 */
447 if (ramstart > PHYS_OFFSET)
448 add_memory_region(PHYS_OFFSET, ramstart - PHYS_OFFSET,
449 BOOT_MEM_RESERVED);
450
451 if (min_low_pfn >= max_low_pfn)
452 panic("Incorrect memory mapping !!!");
453 if (min_low_pfn > ARCH_PFN_OFFSET) {
454 pr_info("Wasting %lu bytes for tracking %lu unused pages\n",
455 (min_low_pfn - ARCH_PFN_OFFSET) * sizeof(struct page),
456 min_low_pfn - ARCH_PFN_OFFSET);
457 } else if (ARCH_PFN_OFFSET - min_low_pfn > 0UL) {
458 pr_info("%lu free pages won't be used\n",
459 ARCH_PFN_OFFSET - min_low_pfn);
460 }
461 min_low_pfn = ARCH_PFN_OFFSET;
462
463 /*
464 * Determine low and high memory ranges
465 */
466 max_pfn = max_low_pfn;
467 if (max_low_pfn > PFN_DOWN(HIGHMEM_START)) {
468#ifdef CONFIG_HIGHMEM
469 highstart_pfn = PFN_DOWN(HIGHMEM_START);
470 highend_pfn = max_low_pfn;
471#endif
472 max_low_pfn = PFN_DOWN(HIGHMEM_START);
473 }
474
475#ifdef CONFIG_BLK_DEV_INITRD
476 /*
477 * mapstart should be after initrd_end
478 */
479 if (initrd_end)
480 mapstart = max(mapstart, (unsigned long)PFN_UP(__pa(initrd_end)));
481#endif
482
483 /*
484 * check that mapstart doesn't overlap with any of
485 * memory regions that have been reserved through eg. DTB
486 */
487 bootmap_size = bootmap_bytes(max_low_pfn - min_low_pfn);
488
489 bootmap_valid = memory_region_available(PFN_PHYS(mapstart),
490 bootmap_size);
491 for (i = 0; i < boot_mem_map.nr_map && !bootmap_valid; i++) {
492 unsigned long mapstart_addr;
493
494 switch (boot_mem_map.map[i].type) {
495 case BOOT_MEM_RESERVED:
496 mapstart_addr = PFN_ALIGN(boot_mem_map.map[i].addr +
497 boot_mem_map.map[i].size);
498 if (PHYS_PFN(mapstart_addr) < mapstart)
499 break;
500
501 bootmap_valid = memory_region_available(mapstart_addr,
502 bootmap_size);
503 if (bootmap_valid)
504 mapstart = PHYS_PFN(mapstart_addr);
505 break;
506 default:
507 break;
508 }
509 }
510
511 if (!bootmap_valid)
512 panic("No memory area to place a bootmap bitmap");
513
514 /*
515 * Initialize the boot-time allocator with low memory only.
516 */
517 if (bootmap_size != init_bootmem_node(NODE_DATA(0), mapstart,
518 min_low_pfn, max_low_pfn))
519 panic("Unexpected memory size required for bootmap");
520
521 for (i = 0; i < boot_mem_map.nr_map; i++) {
522 unsigned long start, end;
523
524 start = PFN_UP(boot_mem_map.map[i].addr);
525 end = PFN_DOWN(boot_mem_map.map[i].addr
526 + boot_mem_map.map[i].size);
527
528 if (start <= min_low_pfn)
529 start = min_low_pfn;
530 if (start >= end)
531 continue;
532
533#ifndef CONFIG_HIGHMEM
534 if (end > max_low_pfn)
535 end = max_low_pfn;
536
537 /*
538 * ... finally, is the area going away?
539 */
540 if (end <= start)
541 continue;
542#endif
543
544 memblock_add_node(PFN_PHYS(start), PFN_PHYS(end - start), 0);
545 }
546
547 /*
548 * Register fully available low RAM pages with the bootmem allocator.
549 */
550 for (i = 0; i < boot_mem_map.nr_map; i++) {
551 unsigned long start, end, size;
552
553 start = PFN_UP(boot_mem_map.map[i].addr);
554 end = PFN_DOWN(boot_mem_map.map[i].addr
555 + boot_mem_map.map[i].size);
556
557 /*
558 * Reserve usable memory.
559 */
560 switch (boot_mem_map.map[i].type) {
561 case BOOT_MEM_RAM:
562 break;
563 case BOOT_MEM_INIT_RAM:
564 memory_present(0, start, end);
565 continue;
566 default:
567 /* Not usable memory */
568 if (start > min_low_pfn && end < max_low_pfn)
569 reserve_bootmem(boot_mem_map.map[i].addr,
570 boot_mem_map.map[i].size,
571 BOOTMEM_DEFAULT);
572 continue;
573 }
574
575 /*
576 * We are rounding up the start address of usable memory
577 * and at the end of the usable range downwards.
578 */
579 if (start >= max_low_pfn)
580 continue;
581 if (start < reserved_end)
582 start = reserved_end;
583 if (end > max_low_pfn)
584 end = max_low_pfn;
585
586 /*
587 * ... finally, is the area going away?
588 */
589 if (end <= start)
590 continue;
591 size = end - start;
592
593 /* Register lowmem ranges */
594 free_bootmem(PFN_PHYS(start), size << PAGE_SHIFT);
595 memory_present(0, start, end);
596 }
597
598 /*
599 * Reserve the bootmap memory.
600 */
601 reserve_bootmem(PFN_PHYS(mapstart), bootmap_size, BOOTMEM_DEFAULT);
602
603#ifdef CONFIG_RELOCATABLE
604 /*
605 * The kernel reserves all memory below its _end symbol as bootmem,
606 * but the kernel may now be at a much higher address. The memory
607 * between the original and new locations may be returned to the system.
608 */
609 if (__pa_symbol(_text) > __pa_symbol(VMLINUX_LOAD_ADDRESS)) {
610 unsigned long offset;
611 extern void show_kernel_relocation(const char *level);
612
613 offset = __pa_symbol(_text) - __pa_symbol(VMLINUX_LOAD_ADDRESS);
614 free_bootmem(__pa_symbol(VMLINUX_LOAD_ADDRESS), offset);
615
616#if defined(CONFIG_DEBUG_KERNEL) && defined(CONFIG_DEBUG_INFO)
617 /*
618 * This information is necessary when debugging the kernel
619 * But is a security vulnerability otherwise!
620 */
621 show_kernel_relocation(KERN_INFO);
622#endif
623 }
624#endif
625
626 /*
627 * Reserve initrd memory if needed.
628 */
629 finalize_initrd();
630}
631
632#endif /* CONFIG_SGI_IP27 */
633
634/*
635 * arch_mem_init - initialize memory management subsystem
636 *
637 * o plat_mem_setup() detects the memory configuration and will record detected
638 * memory areas using add_memory_region.
639 *
640 * At this stage the memory configuration of the system is known to the
641 * kernel but generic memory management system is still entirely uninitialized.
642 *
643 * o bootmem_init()
644 * o sparse_init()
645 * o paging_init()
646 * o dma_contiguous_reserve()
647 *
648 * At this stage the bootmem allocator is ready to use.
649 *
650 * NOTE: historically plat_mem_setup did the entire platform initialization.
651 * This was rather impractical because it meant plat_mem_setup had to
652 * get away without any kind of memory allocator. To keep old code from
653 * breaking plat_setup was just renamed to plat_mem_setup and a second platform
654 * initialization hook for anything else was introduced.
655 */
656
657static int usermem __initdata;
658
659static int __init early_parse_mem(char *p)
660{
661 phys_addr_t start, size;
662
663 /*
664 * If a user specifies memory size, we
665 * blow away any automatically generated
666 * size.
667 */
668 if (usermem == 0) {
669 boot_mem_map.nr_map = 0;
670 usermem = 1;
671 }
672 start = 0;
673 size = memparse(p, &p);
674 if (*p == '@')
675 start = memparse(p + 1, &p);
676
677 add_memory_region(start, size, BOOT_MEM_RAM);
678
679 return 0;
680}
681early_param("mem", early_parse_mem);
682
683static int __init early_parse_memmap(char *p)
684{
685 char *oldp;
686 u64 start_at, mem_size;
687
688 if (!p)
689 return -EINVAL;
690
691 if (!strncmp(p, "exactmap", 8)) {
692 pr_err("\"memmap=exactmap\" invalid on MIPS\n");
693 return 0;
694 }
695
696 oldp = p;
697 mem_size = memparse(p, &p);
698 if (p == oldp)
699 return -EINVAL;
700
701 if (*p == '@') {
702 start_at = memparse(p+1, &p);
703 add_memory_region(start_at, mem_size, BOOT_MEM_RAM);
704 } else if (*p == '#') {
705 pr_err("\"memmap=nn#ss\" (force ACPI data) invalid on MIPS\n");
706 return -EINVAL;
707 } else if (*p == '$') {
708 start_at = memparse(p+1, &p);
709 add_memory_region(start_at, mem_size, BOOT_MEM_RESERVED);
710 } else {
711 pr_err("\"memmap\" invalid format!\n");
712 return -EINVAL;
713 }
714
715 if (*p == '\0') {
716 usermem = 1;
717 return 0;
718 } else
719 return -EINVAL;
720}
721early_param("memmap", early_parse_memmap);
722
723#ifdef CONFIG_PROC_VMCORE
724unsigned long setup_elfcorehdr, setup_elfcorehdr_size;
725static int __init early_parse_elfcorehdr(char *p)
726{
727 int i;
728
729 setup_elfcorehdr = memparse(p, &p);
730
731 for (i = 0; i < boot_mem_map.nr_map; i++) {
732 unsigned long start = boot_mem_map.map[i].addr;
733 unsigned long end = (boot_mem_map.map[i].addr +
734 boot_mem_map.map[i].size);
735 if (setup_elfcorehdr >= start && setup_elfcorehdr < end) {
736 /*
737 * Reserve from the elf core header to the end of
738 * the memory segment, that should all be kdump
739 * reserved memory.
740 */
741 setup_elfcorehdr_size = end - setup_elfcorehdr;
742 break;
743 }
744 }
745 /*
746 * If we don't find it in the memory map, then we shouldn't
747 * have to worry about it, as the new kernel won't use it.
748 */
749 return 0;
750}
751early_param("elfcorehdr", early_parse_elfcorehdr);
752#endif
753
754static void __init arch_mem_addpart(phys_addr_t mem, phys_addr_t end, int type)
755{
756 phys_addr_t size;
757 int i;
758
759 size = end - mem;
760 if (!size)
761 return;
762
763 /* Make sure it is in the boot_mem_map */
764 for (i = 0; i < boot_mem_map.nr_map; i++) {
765 if (mem >= boot_mem_map.map[i].addr &&
766 mem < (boot_mem_map.map[i].addr +
767 boot_mem_map.map[i].size))
768 return;
769 }
770 add_memory_region(mem, size, type);
771}
772
773#ifdef CONFIG_KEXEC
774static inline unsigned long long get_total_mem(void)
775{
776 unsigned long long total;
777
778 total = max_pfn - min_low_pfn;
779 return total << PAGE_SHIFT;
780}
781
782static void __init mips_parse_crashkernel(void)
783{
784 unsigned long long total_mem;
785 unsigned long long crash_size, crash_base;
786 int ret;
787
788 total_mem = get_total_mem();
789 ret = parse_crashkernel(boot_command_line, total_mem,
790 &crash_size, &crash_base);
791 if (ret != 0 || crash_size <= 0)
792 return;
793
794 if (!memory_region_available(crash_base, crash_size)) {
795 pr_warn("Invalid memory region reserved for crash kernel\n");
796 return;
797 }
798
799 crashk_res.start = crash_base;
800 crashk_res.end = crash_base + crash_size - 1;
801}
802
803static void __init request_crashkernel(struct resource *res)
804{
805 int ret;
806
807 if (crashk_res.start == crashk_res.end)
808 return;
809
810 ret = request_resource(res, &crashk_res);
811 if (!ret)
812 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",
813 (unsigned long)((crashk_res.end -
814 crashk_res.start + 1) >> 20),
815 (unsigned long)(crashk_res.start >> 20));
816}
817#else /* !defined(CONFIG_KEXEC) */
818static void __init mips_parse_crashkernel(void)
819{
820}
821
822static void __init request_crashkernel(struct resource *res)
823{
824}
825#endif /* !defined(CONFIG_KEXEC) */
826
827#define USE_PROM_CMDLINE IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_BOOTLOADER)
828#define USE_DTB_CMDLINE IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_DTB)
829#define EXTEND_WITH_PROM IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND)
830#define BUILTIN_EXTEND_WITH_PROM \
831 IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND)
832
833static void __init arch_mem_init(char **cmdline_p)
834{
835 struct memblock_region *reg;
836 extern void plat_mem_setup(void);
837
838#if defined(CONFIG_CMDLINE_BOOL) && defined(CONFIG_CMDLINE_OVERRIDE)
839 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
840#else
841 if ((USE_PROM_CMDLINE && arcs_cmdline[0]) ||
842 (USE_DTB_CMDLINE && !boot_command_line[0]))
843 strlcpy(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
844
845 if (EXTEND_WITH_PROM && arcs_cmdline[0]) {
846 if (boot_command_line[0])
847 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
848 strlcat(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
849 }
850
851#if defined(CONFIG_CMDLINE_BOOL)
852 if (builtin_cmdline[0]) {
853 if (boot_command_line[0])
854 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
855 strlcat(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
856 }
857
858 if (BUILTIN_EXTEND_WITH_PROM && arcs_cmdline[0]) {
859 if (boot_command_line[0])
860 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
861 strlcat(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
862 }
863#endif
864#endif
865
866 /* call board setup routine */
867 plat_mem_setup();
868
869 /*
870 * Make sure all kernel memory is in the maps. The "UP" and
871 * "DOWN" are opposite for initdata since if it crosses over
872 * into another memory section you don't want that to be
873 * freed when the initdata is freed.
874 */
875 arch_mem_addpart(PFN_DOWN(__pa_symbol(&_text)) << PAGE_SHIFT,
876 PFN_UP(__pa_symbol(&_edata)) << PAGE_SHIFT,
877 BOOT_MEM_RAM);
878 arch_mem_addpart(PFN_UP(__pa_symbol(&__init_begin)) << PAGE_SHIFT,
879 PFN_DOWN(__pa_symbol(&__init_end)) << PAGE_SHIFT,
880 BOOT_MEM_INIT_RAM);
881
882 pr_info("Determined physical RAM map:\n");
883 print_memory_map();
884
885 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
886
887 *cmdline_p = command_line;
888
889 parse_early_param();
890
891 if (usermem) {
892 pr_info("User-defined physical RAM map:\n");
893 print_memory_map();
894 }
895
896 early_init_fdt_reserve_self();
897 early_init_fdt_scan_reserved_mem();
898
899 bootmem_init();
900#ifdef CONFIG_PROC_VMCORE
901 if (setup_elfcorehdr && setup_elfcorehdr_size) {
902 printk(KERN_INFO "kdump reserved memory at %lx-%lx\n",
903 setup_elfcorehdr, setup_elfcorehdr_size);
904 reserve_bootmem(setup_elfcorehdr, setup_elfcorehdr_size,
905 BOOTMEM_DEFAULT);
906 }
907#endif
908
909 mips_parse_crashkernel();
910#ifdef CONFIG_KEXEC
911 if (crashk_res.start != crashk_res.end)
912 reserve_bootmem(crashk_res.start,
913 crashk_res.end - crashk_res.start + 1,
914 BOOTMEM_DEFAULT);
915#endif
916 device_tree_init();
917 sparse_init();
918 plat_swiotlb_setup();
919
920 dma_contiguous_reserve(PFN_PHYS(max_low_pfn));
921 /* Tell bootmem about cma reserved memblock section */
922 for_each_memblock(reserved, reg)
923 if (reg->size != 0)
924 reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT);
925
926 reserve_bootmem_region(__pa_symbol(&__nosave_begin),
927 __pa_symbol(&__nosave_end)); /* Reserve for hibernation */
928}
929
930static void __init resource_init(void)
931{
932 int i;
933
934 if (UNCAC_BASE != IO_BASE)
935 return;
936
937 code_resource.start = __pa_symbol(&_text);
938 code_resource.end = __pa_symbol(&_etext) - 1;
939 data_resource.start = __pa_symbol(&_etext);
940 data_resource.end = __pa_symbol(&_edata) - 1;
941 bss_resource.start = __pa_symbol(&__bss_start);
942 bss_resource.end = __pa_symbol(&__bss_stop) - 1;
943
944 for (i = 0; i < boot_mem_map.nr_map; i++) {
945 struct resource *res;
946 unsigned long start, end;
947
948 start = boot_mem_map.map[i].addr;
949 end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1;
950 if (start >= HIGHMEM_START)
951 continue;
952 if (end >= HIGHMEM_START)
953 end = HIGHMEM_START - 1;
954
955 res = alloc_bootmem(sizeof(struct resource));
956
957 res->start = start;
958 res->end = end;
959 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
960
961 switch (boot_mem_map.map[i].type) {
962 case BOOT_MEM_RAM:
963 case BOOT_MEM_INIT_RAM:
964 case BOOT_MEM_ROM_DATA:
965 res->name = "System RAM";
966 res->flags |= IORESOURCE_SYSRAM;
967 break;
968 case BOOT_MEM_RESERVED:
969 default:
970 res->name = "reserved";
971 }
972
973 request_resource(&iomem_resource, res);
974
975 /*
976 * We don't know which RAM region contains kernel data,
977 * so we try it repeatedly and let the resource manager
978 * test it.
979 */
980 request_resource(res, &code_resource);
981 request_resource(res, &data_resource);
982 request_resource(res, &bss_resource);
983 request_crashkernel(res);
984 }
985}
986
987#ifdef CONFIG_SMP
988static void __init prefill_possible_map(void)
989{
990 int i, possible = num_possible_cpus();
991
992 if (possible > nr_cpu_ids)
993 possible = nr_cpu_ids;
994
995 for (i = 0; i < possible; i++)
996 set_cpu_possible(i, true);
997 for (; i < NR_CPUS; i++)
998 set_cpu_possible(i, false);
999
1000 nr_cpu_ids = possible;
1001}
1002#else
1003static inline void prefill_possible_map(void) {}
1004#endif
1005
1006void __init setup_arch(char **cmdline_p)
1007{
1008 cpu_probe();
1009 mips_cm_probe();
1010 prom_init();
1011
1012 setup_early_fdc_console();
1013#ifdef CONFIG_EARLY_PRINTK
1014 setup_early_printk();
1015#endif
1016 cpu_report();
1017 check_bugs_early();
1018
1019#if defined(CONFIG_VT)
1020#if defined(CONFIG_VGA_CONSOLE)
1021 conswitchp = &vga_con;
1022#elif defined(CONFIG_DUMMY_CONSOLE)
1023 conswitchp = &dummy_con;
1024#endif
1025#endif
1026
1027 arch_mem_init(cmdline_p);
1028
1029 resource_init();
1030 plat_smp_setup();
1031 prefill_possible_map();
1032
1033 cpu_cache_init();
1034 paging_init();
1035}
1036
1037unsigned long kernelsp[NR_CPUS];
1038unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
1039
1040#ifdef CONFIG_USE_OF
1041unsigned long fw_passed_dtb;
1042#endif
1043
1044#ifdef CONFIG_DEBUG_FS
1045struct dentry *mips_debugfs_dir;
1046static int __init debugfs_mips(void)
1047{
1048 struct dentry *d;
1049
1050 d = debugfs_create_dir("mips", NULL);
1051 if (!d)
1052 return -ENOMEM;
1053 mips_debugfs_dir = d;
1054 return 0;
1055}
1056arch_initcall(debugfs_mips);
1057#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-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