MIPS: Fix detection of unsupported highmem with cache aliases
[deliverable/linux.git] / arch / mips / kernel / setup.c
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
31 #include <asm/addrspace.h>
32 #include <asm/bootinfo.h>
33 #include <asm/bugs.h>
34 #include <asm/cache.h>
35 #include <asm/cdmm.h>
36 #include <asm/cpu.h>
37 #include <asm/debug.h>
38 #include <asm/sections.h>
39 #include <asm/setup.h>
40 #include <asm/smp-ops.h>
41 #include <asm/prom.h>
42
43 #ifdef CONFIG_MIPS_ELF_APPENDED_DTB
44 const char __section(.appended_dtb) __appended_dtb[0x100000];
45 #endif /* CONFIG_MIPS_ELF_APPENDED_DTB */
46
47 struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;
48
49 EXPORT_SYMBOL(cpu_data);
50
51 #ifdef CONFIG_VT
52 struct screen_info screen_info;
53 #endif
54
55 /*
56 * Setup information
57 *
58 * These are initialized so they are in the .data section
59 */
60 unsigned long mips_machtype __read_mostly = MACH_UNKNOWN;
61
62 EXPORT_SYMBOL(mips_machtype);
63
64 struct boot_mem_map boot_mem_map;
65
66 static char __initdata command_line[COMMAND_LINE_SIZE];
67 char __initdata arcs_cmdline[COMMAND_LINE_SIZE];
68
69 #ifdef CONFIG_CMDLINE_BOOL
70 static 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 */
77 const unsigned long mips_io_port_base = -1;
78 EXPORT_SYMBOL(mips_io_port_base);
79
80 static struct resource code_resource = { .name = "Kernel code", };
81 static struct resource data_resource = { .name = "Kernel data", };
82
83 static void *detect_magic __initdata = detect_memory_region;
84
85 void __init add_memory_region(phys_addr_t start, phys_addr_t size, long type)
86 {
87 int x = boot_mem_map.nr_map;
88 int i;
89
90 /*
91 * If the region reaches the top of the physical address space, adjust
92 * the size slightly so that (start + size) doesn't overflow
93 */
94 if (start + size - 1 == (phys_addr_t)ULLONG_MAX)
95 --size;
96
97 /* Sanity check */
98 if (start + size < start) {
99 pr_warn("Trying to add an invalid memory region, skipped\n");
100 return;
101 }
102
103 /*
104 * Try to merge with existing entry, if any.
105 */
106 for (i = 0; i < boot_mem_map.nr_map; i++) {
107 struct boot_mem_map_entry *entry = boot_mem_map.map + i;
108 unsigned long top;
109
110 if (entry->type != type)
111 continue;
112
113 if (start + size < entry->addr)
114 continue; /* no overlap */
115
116 if (entry->addr + entry->size < start)
117 continue; /* no overlap */
118
119 top = max(entry->addr + entry->size, start + size);
120 entry->addr = min(entry->addr, start);
121 entry->size = top - entry->addr;
122
123 return;
124 }
125
126 if (boot_mem_map.nr_map == BOOT_MEM_MAP_MAX) {
127 pr_err("Ooops! Too many entries in the memory map!\n");
128 return;
129 }
130
131 boot_mem_map.map[x].addr = start;
132 boot_mem_map.map[x].size = size;
133 boot_mem_map.map[x].type = type;
134 boot_mem_map.nr_map++;
135 }
136
137 void __init detect_memory_region(phys_addr_t start, phys_addr_t sz_min, phys_addr_t sz_max)
138 {
139 void *dm = &detect_magic;
140 phys_addr_t size;
141
142 for (size = sz_min; size < sz_max; size <<= 1) {
143 if (!memcmp(dm, dm + size, sizeof(detect_magic)))
144 break;
145 }
146
147 pr_debug("Memory: %lluMB of RAM detected at 0x%llx (min: %lluMB, max: %lluMB)\n",
148 ((unsigned long long) size) / SZ_1M,
149 (unsigned long long) start,
150 ((unsigned long long) sz_min) / SZ_1M,
151 ((unsigned long long) sz_max) / SZ_1M);
152
153 add_memory_region(start, size, BOOT_MEM_RAM);
154 }
155
156 static void __init print_memory_map(void)
157 {
158 int i;
159 const int field = 2 * sizeof(unsigned long);
160
161 for (i = 0; i < boot_mem_map.nr_map; i++) {
162 printk(KERN_INFO " memory: %0*Lx @ %0*Lx ",
163 field, (unsigned long long) boot_mem_map.map[i].size,
164 field, (unsigned long long) boot_mem_map.map[i].addr);
165
166 switch (boot_mem_map.map[i].type) {
167 case BOOT_MEM_RAM:
168 printk(KERN_CONT "(usable)\n");
169 break;
170 case BOOT_MEM_INIT_RAM:
171 printk(KERN_CONT "(usable after init)\n");
172 break;
173 case BOOT_MEM_ROM_DATA:
174 printk(KERN_CONT "(ROM data)\n");
175 break;
176 case BOOT_MEM_RESERVED:
177 printk(KERN_CONT "(reserved)\n");
178 break;
179 default:
180 printk(KERN_CONT "type %lu\n", boot_mem_map.map[i].type);
181 break;
182 }
183 }
184 }
185
186 /*
187 * Manage initrd
188 */
189 #ifdef CONFIG_BLK_DEV_INITRD
190
191 static int __init rd_start_early(char *p)
192 {
193 unsigned long start = memparse(p, &p);
194
195 #ifdef CONFIG_64BIT
196 /* Guess if the sign extension was forgotten by bootloader */
197 if (start < XKPHYS)
198 start = (int)start;
199 #endif
200 initrd_start = start;
201 initrd_end += start;
202 return 0;
203 }
204 early_param("rd_start", rd_start_early);
205
206 static int __init rd_size_early(char *p)
207 {
208 initrd_end += memparse(p, &p);
209 return 0;
210 }
211 early_param("rd_size", rd_size_early);
212
213 /* it returns the next free pfn after initrd */
214 static unsigned long __init init_initrd(void)
215 {
216 unsigned long end;
217
218 /*
219 * Board specific code or command line parser should have
220 * already set up initrd_start and initrd_end. In these cases
221 * perfom sanity checks and use them if all looks good.
222 */
223 if (!initrd_start || initrd_end <= initrd_start)
224 goto disable;
225
226 if (initrd_start & ~PAGE_MASK) {
227 pr_err("initrd start must be page aligned\n");
228 goto disable;
229 }
230 if (initrd_start < PAGE_OFFSET) {
231 pr_err("initrd start < PAGE_OFFSET\n");
232 goto disable;
233 }
234
235 /*
236 * Sanitize initrd addresses. For example firmware
237 * can't guess if they need to pass them through
238 * 64-bits values if the kernel has been built in pure
239 * 32-bit. We need also to switch from KSEG0 to XKPHYS
240 * addresses now, so the code can now safely use __pa().
241 */
242 end = __pa(initrd_end);
243 initrd_end = (unsigned long)__va(end);
244 initrd_start = (unsigned long)__va(__pa(initrd_start));
245
246 ROOT_DEV = Root_RAM0;
247 return PFN_UP(end);
248 disable:
249 initrd_start = 0;
250 initrd_end = 0;
251 return 0;
252 }
253
254 /* In some conditions (e.g. big endian bootloader with a little endian
255 kernel), the initrd might appear byte swapped. Try to detect this and
256 byte swap it if needed. */
257 static void __init maybe_bswap_initrd(void)
258 {
259 #if defined(CONFIG_CPU_CAVIUM_OCTEON)
260 u64 buf;
261
262 /* Check for CPIO signature */
263 if (!memcmp((void *)initrd_start, "070701", 6))
264 return;
265
266 /* Check for compressed initrd */
267 if (decompress_method((unsigned char *)initrd_start, 8, NULL))
268 return;
269
270 /* Try again with a byte swapped header */
271 buf = swab64p((u64 *)initrd_start);
272 if (!memcmp(&buf, "070701", 6) ||
273 decompress_method((unsigned char *)(&buf), 8, NULL)) {
274 unsigned long i;
275
276 pr_info("Byteswapped initrd detected\n");
277 for (i = initrd_start; i < ALIGN(initrd_end, 8); i += 8)
278 swab64s((u64 *)i);
279 }
280 #endif
281 }
282
283 static void __init finalize_initrd(void)
284 {
285 unsigned long size = initrd_end - initrd_start;
286
287 if (size == 0) {
288 printk(KERN_INFO "Initrd not found or empty");
289 goto disable;
290 }
291 if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
292 printk(KERN_ERR "Initrd extends beyond end of memory");
293 goto disable;
294 }
295
296 maybe_bswap_initrd();
297
298 reserve_bootmem(__pa(initrd_start), size, BOOTMEM_DEFAULT);
299 initrd_below_start_ok = 1;
300
301 pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",
302 initrd_start, size);
303 return;
304 disable:
305 printk(KERN_CONT " - disabling initrd\n");
306 initrd_start = 0;
307 initrd_end = 0;
308 }
309
310 #else /* !CONFIG_BLK_DEV_INITRD */
311
312 static unsigned long __init init_initrd(void)
313 {
314 return 0;
315 }
316
317 #define finalize_initrd() do {} while (0)
318
319 #endif
320
321 /*
322 * Initialize the bootmem allocator. It also setup initrd related data
323 * if needed.
324 */
325 #if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON3) && defined(CONFIG_NUMA))
326
327 static void __init bootmem_init(void)
328 {
329 init_initrd();
330 finalize_initrd();
331 }
332
333 #else /* !CONFIG_SGI_IP27 */
334
335 static void __init bootmem_init(void)
336 {
337 unsigned long reserved_end;
338 unsigned long mapstart = ~0UL;
339 unsigned long bootmap_size;
340 int i;
341
342 /*
343 * Sanity check any INITRD first. We don't take it into account
344 * for bootmem setup initially, rely on the end-of-kernel-code
345 * as our memory range starting point. Once bootmem is inited we
346 * will reserve the area used for the initrd.
347 */
348 init_initrd();
349 reserved_end = (unsigned long) PFN_UP(__pa_symbol(&_end));
350
351 /*
352 * max_low_pfn is not a number of pages. The number of pages
353 * of the system is given by 'max_low_pfn - min_low_pfn'.
354 */
355 min_low_pfn = ~0UL;
356 max_low_pfn = 0;
357
358 /*
359 * Find the highest page frame number we have available.
360 */
361 for (i = 0; i < boot_mem_map.nr_map; i++) {
362 unsigned long start, end;
363
364 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
365 continue;
366
367 start = PFN_UP(boot_mem_map.map[i].addr);
368 end = PFN_DOWN(boot_mem_map.map[i].addr
369 + boot_mem_map.map[i].size);
370
371 if (end > max_low_pfn)
372 max_low_pfn = end;
373 if (start < min_low_pfn)
374 min_low_pfn = start;
375 if (end <= reserved_end)
376 continue;
377 #ifdef CONFIG_BLK_DEV_INITRD
378 /* Skip zones before initrd and initrd itself */
379 if (initrd_end && end <= (unsigned long)PFN_UP(__pa(initrd_end)))
380 continue;
381 #endif
382 if (start >= mapstart)
383 continue;
384 mapstart = max(reserved_end, start);
385 }
386
387 if (min_low_pfn >= max_low_pfn)
388 panic("Incorrect memory mapping !!!");
389 if (min_low_pfn > ARCH_PFN_OFFSET) {
390 pr_info("Wasting %lu bytes for tracking %lu unused pages\n",
391 (min_low_pfn - ARCH_PFN_OFFSET) * sizeof(struct page),
392 min_low_pfn - ARCH_PFN_OFFSET);
393 } else if (min_low_pfn < ARCH_PFN_OFFSET) {
394 pr_info("%lu free pages won't be used\n",
395 ARCH_PFN_OFFSET - min_low_pfn);
396 }
397 min_low_pfn = ARCH_PFN_OFFSET;
398
399 /*
400 * Determine low and high memory ranges
401 */
402 max_pfn = max_low_pfn;
403 if (max_low_pfn > PFN_DOWN(HIGHMEM_START)) {
404 #ifdef CONFIG_HIGHMEM
405 highstart_pfn = PFN_DOWN(HIGHMEM_START);
406 highend_pfn = max_low_pfn;
407 #endif
408 max_low_pfn = PFN_DOWN(HIGHMEM_START);
409 }
410
411 #ifdef CONFIG_BLK_DEV_INITRD
412 /*
413 * mapstart should be after initrd_end
414 */
415 if (initrd_end)
416 mapstart = max(mapstart, (unsigned long)PFN_UP(__pa(initrd_end)));
417 #endif
418
419 /*
420 * Initialize the boot-time allocator with low memory only.
421 */
422 bootmap_size = init_bootmem_node(NODE_DATA(0), mapstart,
423 min_low_pfn, max_low_pfn);
424
425
426 for (i = 0; i < boot_mem_map.nr_map; i++) {
427 unsigned long start, end;
428
429 start = PFN_UP(boot_mem_map.map[i].addr);
430 end = PFN_DOWN(boot_mem_map.map[i].addr
431 + boot_mem_map.map[i].size);
432
433 if (start <= min_low_pfn)
434 start = min_low_pfn;
435 if (start >= end)
436 continue;
437
438 #ifndef CONFIG_HIGHMEM
439 if (end > max_low_pfn)
440 end = max_low_pfn;
441
442 /*
443 * ... finally, is the area going away?
444 */
445 if (end <= start)
446 continue;
447 #endif
448
449 memblock_add_node(PFN_PHYS(start), PFN_PHYS(end - start), 0);
450 }
451
452 /*
453 * Register fully available low RAM pages with the bootmem allocator.
454 */
455 for (i = 0; i < boot_mem_map.nr_map; i++) {
456 unsigned long start, end, size;
457
458 start = PFN_UP(boot_mem_map.map[i].addr);
459 end = PFN_DOWN(boot_mem_map.map[i].addr
460 + boot_mem_map.map[i].size);
461
462 /*
463 * Reserve usable memory.
464 */
465 switch (boot_mem_map.map[i].type) {
466 case BOOT_MEM_RAM:
467 break;
468 case BOOT_MEM_INIT_RAM:
469 memory_present(0, start, end);
470 continue;
471 default:
472 /* Not usable memory */
473 continue;
474 }
475
476 /*
477 * We are rounding up the start address of usable memory
478 * and at the end of the usable range downwards.
479 */
480 if (start >= max_low_pfn)
481 continue;
482 if (start < reserved_end)
483 start = reserved_end;
484 if (end > max_low_pfn)
485 end = max_low_pfn;
486
487 /*
488 * ... finally, is the area going away?
489 */
490 if (end <= start)
491 continue;
492 size = end - start;
493
494 /* Register lowmem ranges */
495 free_bootmem(PFN_PHYS(start), size << PAGE_SHIFT);
496 memory_present(0, start, end);
497 }
498
499 /*
500 * Reserve the bootmap memory.
501 */
502 reserve_bootmem(PFN_PHYS(mapstart), bootmap_size, BOOTMEM_DEFAULT);
503
504 #ifdef CONFIG_RELOCATABLE
505 /*
506 * The kernel reserves all memory below its _end symbol as bootmem,
507 * but the kernel may now be at a much higher address. The memory
508 * between the original and new locations may be returned to the system.
509 */
510 if (__pa_symbol(_text) > __pa_symbol(VMLINUX_LOAD_ADDRESS)) {
511 unsigned long offset;
512 extern void show_kernel_relocation(const char *level);
513
514 offset = __pa_symbol(_text) - __pa_symbol(VMLINUX_LOAD_ADDRESS);
515 free_bootmem(__pa_symbol(VMLINUX_LOAD_ADDRESS), offset);
516
517 #if defined(CONFIG_DEBUG_KERNEL) && defined(CONFIG_DEBUG_INFO)
518 /*
519 * This information is necessary when debugging the kernel
520 * But is a security vulnerability otherwise!
521 */
522 show_kernel_relocation(KERN_INFO);
523 #endif
524 }
525 #endif
526
527 /*
528 * Reserve initrd memory if needed.
529 */
530 finalize_initrd();
531 }
532
533 #endif /* CONFIG_SGI_IP27 */
534
535 /*
536 * arch_mem_init - initialize memory management subsystem
537 *
538 * o plat_mem_setup() detects the memory configuration and will record detected
539 * memory areas using add_memory_region.
540 *
541 * At this stage the memory configuration of the system is known to the
542 * kernel but generic memory management system is still entirely uninitialized.
543 *
544 * o bootmem_init()
545 * o sparse_init()
546 * o paging_init()
547 * o dma_contiguous_reserve()
548 *
549 * At this stage the bootmem allocator is ready to use.
550 *
551 * NOTE: historically plat_mem_setup did the entire platform initialization.
552 * This was rather impractical because it meant plat_mem_setup had to
553 * get away without any kind of memory allocator. To keep old code from
554 * breaking plat_setup was just renamed to plat_mem_setup and a second platform
555 * initialization hook for anything else was introduced.
556 */
557
558 static int usermem __initdata;
559
560 static int __init early_parse_mem(char *p)
561 {
562 phys_addr_t start, size;
563
564 /*
565 * If a user specifies memory size, we
566 * blow away any automatically generated
567 * size.
568 */
569 if (usermem == 0) {
570 boot_mem_map.nr_map = 0;
571 usermem = 1;
572 }
573 start = 0;
574 size = memparse(p, &p);
575 if (*p == '@')
576 start = memparse(p + 1, &p);
577
578 add_memory_region(start, size, BOOT_MEM_RAM);
579 return 0;
580 }
581 early_param("mem", early_parse_mem);
582
583 #ifdef CONFIG_PROC_VMCORE
584 unsigned long setup_elfcorehdr, setup_elfcorehdr_size;
585 static int __init early_parse_elfcorehdr(char *p)
586 {
587 int i;
588
589 setup_elfcorehdr = memparse(p, &p);
590
591 for (i = 0; i < boot_mem_map.nr_map; i++) {
592 unsigned long start = boot_mem_map.map[i].addr;
593 unsigned long end = (boot_mem_map.map[i].addr +
594 boot_mem_map.map[i].size);
595 if (setup_elfcorehdr >= start && setup_elfcorehdr < end) {
596 /*
597 * Reserve from the elf core header to the end of
598 * the memory segment, that should all be kdump
599 * reserved memory.
600 */
601 setup_elfcorehdr_size = end - setup_elfcorehdr;
602 break;
603 }
604 }
605 /*
606 * If we don't find it in the memory map, then we shouldn't
607 * have to worry about it, as the new kernel won't use it.
608 */
609 return 0;
610 }
611 early_param("elfcorehdr", early_parse_elfcorehdr);
612 #endif
613
614 static void __init arch_mem_addpart(phys_addr_t mem, phys_addr_t end, int type)
615 {
616 phys_addr_t size;
617 int i;
618
619 size = end - mem;
620 if (!size)
621 return;
622
623 /* Make sure it is in the boot_mem_map */
624 for (i = 0; i < boot_mem_map.nr_map; i++) {
625 if (mem >= boot_mem_map.map[i].addr &&
626 mem < (boot_mem_map.map[i].addr +
627 boot_mem_map.map[i].size))
628 return;
629 }
630 add_memory_region(mem, size, type);
631 }
632
633 #ifdef CONFIG_KEXEC
634 static inline unsigned long long get_total_mem(void)
635 {
636 unsigned long long total;
637
638 total = max_pfn - min_low_pfn;
639 return total << PAGE_SHIFT;
640 }
641
642 static void __init mips_parse_crashkernel(void)
643 {
644 unsigned long long total_mem;
645 unsigned long long crash_size, crash_base;
646 int ret;
647
648 total_mem = get_total_mem();
649 ret = parse_crashkernel(boot_command_line, total_mem,
650 &crash_size, &crash_base);
651 if (ret != 0 || crash_size <= 0)
652 return;
653
654 crashk_res.start = crash_base;
655 crashk_res.end = crash_base + crash_size - 1;
656 }
657
658 static void __init request_crashkernel(struct resource *res)
659 {
660 int ret;
661
662 ret = request_resource(res, &crashk_res);
663 if (!ret)
664 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",
665 (unsigned long)((crashk_res.end -
666 crashk_res.start + 1) >> 20),
667 (unsigned long)(crashk_res.start >> 20));
668 }
669 #else /* !defined(CONFIG_KEXEC) */
670 static void __init mips_parse_crashkernel(void)
671 {
672 }
673
674 static void __init request_crashkernel(struct resource *res)
675 {
676 }
677 #endif /* !defined(CONFIG_KEXEC) */
678
679 #define USE_PROM_CMDLINE IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_BOOTLOADER)
680 #define USE_DTB_CMDLINE IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_DTB)
681 #define EXTEND_WITH_PROM IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND)
682 #define BUILTIN_EXTEND_WITH_PROM \
683 IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND)
684
685 static void __init arch_mem_init(char **cmdline_p)
686 {
687 struct memblock_region *reg;
688 extern void plat_mem_setup(void);
689
690 /* call board setup routine */
691 plat_mem_setup();
692
693 /*
694 * Make sure all kernel memory is in the maps. The "UP" and
695 * "DOWN" are opposite for initdata since if it crosses over
696 * into another memory section you don't want that to be
697 * freed when the initdata is freed.
698 */
699 arch_mem_addpart(PFN_DOWN(__pa_symbol(&_text)) << PAGE_SHIFT,
700 PFN_UP(__pa_symbol(&_edata)) << PAGE_SHIFT,
701 BOOT_MEM_RAM);
702 arch_mem_addpart(PFN_UP(__pa_symbol(&__init_begin)) << PAGE_SHIFT,
703 PFN_DOWN(__pa_symbol(&__init_end)) << PAGE_SHIFT,
704 BOOT_MEM_INIT_RAM);
705
706 pr_info("Determined physical RAM map:\n");
707 print_memory_map();
708
709 #if defined(CONFIG_CMDLINE_BOOL) && defined(CONFIG_CMDLINE_OVERRIDE)
710 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
711 #else
712 if ((USE_PROM_CMDLINE && arcs_cmdline[0]) ||
713 (USE_DTB_CMDLINE && !boot_command_line[0]))
714 strlcpy(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
715
716 if (EXTEND_WITH_PROM && arcs_cmdline[0]) {
717 if (boot_command_line[0])
718 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
719 strlcat(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
720 }
721
722 #if defined(CONFIG_CMDLINE_BOOL)
723 if (builtin_cmdline[0]) {
724 if (boot_command_line[0])
725 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
726 strlcat(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
727 }
728
729 if (BUILTIN_EXTEND_WITH_PROM && arcs_cmdline[0]) {
730 if (boot_command_line[0])
731 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
732 strlcat(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
733 }
734 #endif
735 #endif
736 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
737
738 *cmdline_p = command_line;
739
740 parse_early_param();
741
742 if (usermem) {
743 pr_info("User-defined physical RAM map:\n");
744 print_memory_map();
745 }
746
747 bootmem_init();
748 #ifdef CONFIG_PROC_VMCORE
749 if (setup_elfcorehdr && setup_elfcorehdr_size) {
750 printk(KERN_INFO "kdump reserved memory at %lx-%lx\n",
751 setup_elfcorehdr, setup_elfcorehdr_size);
752 reserve_bootmem(setup_elfcorehdr, setup_elfcorehdr_size,
753 BOOTMEM_DEFAULT);
754 }
755 #endif
756
757 mips_parse_crashkernel();
758 #ifdef CONFIG_KEXEC
759 if (crashk_res.start != crashk_res.end)
760 reserve_bootmem(crashk_res.start,
761 crashk_res.end - crashk_res.start + 1,
762 BOOTMEM_DEFAULT);
763 #endif
764 device_tree_init();
765 sparse_init();
766 plat_swiotlb_setup();
767
768 dma_contiguous_reserve(PFN_PHYS(max_low_pfn));
769 /* Tell bootmem about cma reserved memblock section */
770 for_each_memblock(reserved, reg)
771 if (reg->size != 0)
772 reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT);
773
774 reserve_bootmem_region(__pa_symbol(&__nosave_begin),
775 __pa_symbol(&__nosave_end)); /* Reserve for hibernation */
776 }
777
778 static void __init resource_init(void)
779 {
780 int i;
781
782 if (UNCAC_BASE != IO_BASE)
783 return;
784
785 code_resource.start = __pa_symbol(&_text);
786 code_resource.end = __pa_symbol(&_etext) - 1;
787 data_resource.start = __pa_symbol(&_etext);
788 data_resource.end = __pa_symbol(&_edata) - 1;
789
790 for (i = 0; i < boot_mem_map.nr_map; i++) {
791 struct resource *res;
792 unsigned long start, end;
793
794 start = boot_mem_map.map[i].addr;
795 end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1;
796 if (start >= HIGHMEM_START)
797 continue;
798 if (end >= HIGHMEM_START)
799 end = HIGHMEM_START - 1;
800
801 res = alloc_bootmem(sizeof(struct resource));
802
803 res->start = start;
804 res->end = end;
805 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
806
807 switch (boot_mem_map.map[i].type) {
808 case BOOT_MEM_RAM:
809 case BOOT_MEM_INIT_RAM:
810 case BOOT_MEM_ROM_DATA:
811 res->name = "System RAM";
812 res->flags |= IORESOURCE_SYSRAM;
813 break;
814 case BOOT_MEM_RESERVED:
815 default:
816 res->name = "reserved";
817 }
818
819 request_resource(&iomem_resource, res);
820
821 /*
822 * We don't know which RAM region contains kernel data,
823 * so we try it repeatedly and let the resource manager
824 * test it.
825 */
826 request_resource(res, &code_resource);
827 request_resource(res, &data_resource);
828 request_crashkernel(res);
829 }
830 }
831
832 #ifdef CONFIG_SMP
833 static void __init prefill_possible_map(void)
834 {
835 int i, possible = num_possible_cpus();
836
837 if (possible > nr_cpu_ids)
838 possible = nr_cpu_ids;
839
840 for (i = 0; i < possible; i++)
841 set_cpu_possible(i, true);
842 for (; i < NR_CPUS; i++)
843 set_cpu_possible(i, false);
844
845 nr_cpu_ids = possible;
846 }
847 #else
848 static inline void prefill_possible_map(void) {}
849 #endif
850
851 void __init setup_arch(char **cmdline_p)
852 {
853 cpu_probe();
854 mips_cm_probe();
855 prom_init();
856
857 setup_early_fdc_console();
858 #ifdef CONFIG_EARLY_PRINTK
859 setup_early_printk();
860 #endif
861 cpu_report();
862 check_bugs_early();
863
864 #if defined(CONFIG_VT)
865 #if defined(CONFIG_VGA_CONSOLE)
866 conswitchp = &vga_con;
867 #elif defined(CONFIG_DUMMY_CONSOLE)
868 conswitchp = &dummy_con;
869 #endif
870 #endif
871
872 arch_mem_init(cmdline_p);
873
874 resource_init();
875 plat_smp_setup();
876 prefill_possible_map();
877
878 cpu_cache_init();
879 paging_init();
880 }
881
882 unsigned long kernelsp[NR_CPUS];
883 unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
884
885 #ifdef CONFIG_USE_OF
886 unsigned long fw_passed_dtb;
887 #endif
888
889 #ifdef CONFIG_DEBUG_FS
890 struct dentry *mips_debugfs_dir;
891 static int __init debugfs_mips(void)
892 {
893 struct dentry *d;
894
895 d = debugfs_create_dir("mips", NULL);
896 if (!d)
897 return -ENOMEM;
898 mips_debugfs_dir = d;
899 return 0;
900 }
901 arch_initcall(debugfs_mips);
902 #endif
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