projects / deliverable / linux.git / blob
? search:


d90c659b70e965bb1b5c9355a92d58c081a87ae2
[deliverable/linux.git] / arch / x86 / kernel / setup.c
1 /*
2 * Copyright (C) 1995 Linus Torvalds
3 *
4 * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999
5 *
6 * Memory region support
7 * David Parsons <orc@pell.chi.il.us>, July-August 1999
8 *
9 * Added E820 sanitization routine (removes overlapping memory regions);
10 * Brian Moyle <bmoyle@mvista.com>, February 2001
11 *
12 * Moved CPU detection code to cpu/${cpu}.c
13 * Patrick Mochel <mochel@osdl.org>, March 2002
14 *
15 * Provisions for empty E820 memory regions (reported by certain BIOSes).
16 * Alex Achenbach <xela@slit.de>, December 2002.
17 *
18 */
19
20 /*
21 * This file handles the architecture-dependent parts of initialization
22 */
23
24 #include <linux/sched.h>
25 #include <linux/mm.h>
26 #include <linux/mmzone.h>
27 #include <linux/screen_info.h>
28 #include <linux/ioport.h>
29 #include <linux/acpi.h>
30 #include <linux/apm_bios.h>
31 #include <linux/initrd.h>
32 #include <linux/bootmem.h>
33 #include <linux/seq_file.h>
34 #include <linux/console.h>
35 #include <linux/mca.h>
36 #include <linux/root_dev.h>
37 #include <linux/highmem.h>
38 #include <linux/module.h>
39 #include <linux/efi.h>
40 #include <linux/init.h>
41 #include <linux/edd.h>
42 #include <linux/iscsi_ibft.h>
43 #include <linux/nodemask.h>
44 #include <linux/kexec.h>
45 #include <linux/dmi.h>
46 #include <linux/pfn.h>
47 #include <linux/pci.h>
48 #include <asm/pci-direct.h>
49 #include <linux/init_ohci1394_dma.h>
50 #include <linux/kvm_para.h>
51
52 #include <linux/errno.h>
53 #include <linux/kernel.h>
54 #include <linux/stddef.h>
55 #include <linux/unistd.h>
56 #include <linux/ptrace.h>
57 #include <linux/slab.h>
58 #include <linux/user.h>
59 #include <linux/delay.h>
60
61 #include <linux/kallsyms.h>
62 #include <linux/cpufreq.h>
63 #include <linux/dma-mapping.h>
64 #include <linux/ctype.h>
65 #include <linux/uaccess.h>
66
67 #include <linux/percpu.h>
68 #include <linux/crash_dump.h>
69
70 #include <video/edid.h>
71
72 #include <asm/mtrr.h>
73 #include <asm/apic.h>
74 #include <asm/e820.h>
75 #include <asm/mpspec.h>
76 #include <asm/setup.h>
77 #include <asm/arch_hooks.h>
78 #include <asm/efi.h>
79 #include <asm/sections.h>
80 #include <asm/dmi.h>
81 #include <asm/io_apic.h>
82 #include <asm/ist.h>
83 #include <asm/vmi.h>
84 #include <setup_arch.h>
85 #include <asm/bios_ebda.h>
86 #include <asm/cacheflush.h>
87 #include <asm/processor.h>
88 #include <asm/bugs.h>
89
90 #include <asm/system.h>
91 #include <asm/vsyscall.h>
92 #include <asm/smp.h>
93 #include <asm/desc.h>
94 #include <asm/dma.h>
95 #include <asm/iommu.h>
96 #include <asm/mmu_context.h>
97 #include <asm/proto.h>
98
99 #include <mach_apic.h>
100 #include <asm/paravirt.h>
101
102 #include <asm/percpu.h>
103 #include <asm/topology.h>
104 #include <asm/apicdef.h>
105 #ifdef CONFIG_X86_64
106 #include <asm/numa_64.h>
107 #endif
108
109 #ifndef ARCH_SETUP
110 #define ARCH_SETUP
111 #endif
112
113 #ifndef CONFIG_DEBUG_BOOT_PARAMS
114 struct boot_params __initdata boot_params;
115 #else
116 struct boot_params boot_params;
117 #endif
118
119 /*
120 * Machine setup..
121 */
122 static struct resource data_resource = {
123 .name = "Kernel data",
124 .start = 0,
125 .end = 0,
126 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
127 };
128
129 static struct resource code_resource = {
130 .name = "Kernel code",
131 .start = 0,
132 .end = 0,
133 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
134 };
135
136 static struct resource bss_resource = {
137 .name = "Kernel bss",
138 .start = 0,
139 .end = 0,
140 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
141 };
142
143
144 #ifdef CONFIG_X86_32
145 /* This value is set up by the early boot code to point to the value
146 immediately after the boot time page tables. It contains a *physical*
147 address, and must not be in the .bss segment! */
148 unsigned long init_pg_tables_start __initdata = ~0UL;
149 unsigned long init_pg_tables_end __initdata = ~0UL;
150
151 static struct resource video_ram_resource = {
152 .name = "Video RAM area",
153 .start = 0xa0000,
154 .end = 0xbffff,
155 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
156 };
157
158 /* cpu data as detected by the assembly code in head.S */
159 struct cpuinfo_x86 new_cpu_data __cpuinitdata = {0, 0, 0, 0, -1, 1, 0, 0, -1};
160 /* common cpu data for all cpus */
161 struct cpuinfo_x86 boot_cpu_data __read_mostly = {0, 0, 0, 0, -1, 1, 0, 0, -1};
162 EXPORT_SYMBOL(boot_cpu_data);
163 static void set_mca_bus(int x)
164 {
165 #ifdef CONFIG_MCA
166 MCA_bus = x;
167 #endif
168 }
169
170 unsigned int def_to_bigsmp;
171
172 /* for MCA, but anyone else can use it if they want */
173 unsigned int machine_id;
174 unsigned int machine_submodel_id;
175 unsigned int BIOS_revision;
176
177 struct apm_info apm_info;
178 EXPORT_SYMBOL(apm_info);
179
180 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
181 defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
182 struct ist_info ist_info;
183 EXPORT_SYMBOL(ist_info);
184 #else
185 struct ist_info ist_info;
186 #endif
187
188 #else
189 struct cpuinfo_x86 boot_cpu_data __read_mostly;
190 EXPORT_SYMBOL(boot_cpu_data);
191 #endif
192
193
194 #if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64)
195 unsigned long mmu_cr4_features;
196 #else
197 unsigned long mmu_cr4_features = X86_CR4_PAE;
198 #endif
199
200 /* Boot loader ID as an integer, for the benefit of proc_dointvec */
201 int bootloader_type;
202
203 /*
204 * Early DMI memory
205 */
206 int dmi_alloc_index;
207 char dmi_alloc_data[DMI_MAX_DATA];
208
209 /*
210 * Setup options
211 */
212 struct screen_info screen_info;
213 EXPORT_SYMBOL(screen_info);
214 struct edid_info edid_info;
215 EXPORT_SYMBOL_GPL(edid_info);
216
217 extern int root_mountflags;
218
219 unsigned long saved_video_mode;
220
221 #define RAMDISK_IMAGE_START_MASK 0x07FF
222 #define RAMDISK_PROMPT_FLAG 0x8000
223 #define RAMDISK_LOAD_FLAG 0x4000
224
225 static char __initdata command_line[COMMAND_LINE_SIZE];
226 #ifdef CONFIG_CMDLINE_BOOL
227 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
228 #endif
229
230 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
231 struct edd edd;
232 #ifdef CONFIG_EDD_MODULE
233 EXPORT_SYMBOL(edd);
234 #endif
235 /**
236 * copy_edd() - Copy the BIOS EDD information
237 * from boot_params into a safe place.
238 *
239 */
240 static inline void copy_edd(void)
241 {
242 memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer,
243 sizeof(edd.mbr_signature));
244 memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
245 edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
246 edd.edd_info_nr = boot_params.eddbuf_entries;
247 }
248 #else
249 static inline void copy_edd(void)
250 {
251 }
252 #endif
253
254 #ifdef CONFIG_BLK_DEV_INITRD
255
256 #ifdef CONFIG_X86_32
257
258 #define MAX_MAP_CHUNK (NR_FIX_BTMAPS << PAGE_SHIFT)
259 static void __init relocate_initrd(void)
260 {
261
262 u64 ramdisk_image = boot_params.hdr.ramdisk_image;
263 u64 ramdisk_size = boot_params.hdr.ramdisk_size;
264 u64 end_of_lowmem = max_low_pfn << PAGE_SHIFT;
265 u64 ramdisk_here;
266 unsigned long slop, clen, mapaddr;
267 char *p, *q;
268
269 /* We need to move the initrd down into lowmem */
270 ramdisk_here = find_e820_area(0, end_of_lowmem, ramdisk_size,
271 PAGE_SIZE);
272
273 if (ramdisk_here == -1ULL)
274 panic("Cannot find place for new RAMDISK of size %lld\n",
275 ramdisk_size);
276
277 /* Note: this includes all the lowmem currently occupied by
278 the initrd, we rely on that fact to keep the data intact. */
279 reserve_early(ramdisk_here, ramdisk_here + ramdisk_size,
280 "NEW RAMDISK");
281 initrd_start = ramdisk_here + PAGE_OFFSET;
282 initrd_end = initrd_start + ramdisk_size;
283 printk(KERN_INFO "Allocated new RAMDISK: %08llx - %08llx\n",
284 ramdisk_here, ramdisk_here + ramdisk_size);
285
286 q = (char *)initrd_start;
287
288 /* Copy any lowmem portion of the initrd */
289 if (ramdisk_image < end_of_lowmem) {
290 clen = end_of_lowmem - ramdisk_image;
291 p = (char *)__va(ramdisk_image);
292 memcpy(q, p, clen);
293 q += clen;
294 ramdisk_image += clen;
295 ramdisk_size -= clen;
296 }
297
298 /* Copy the highmem portion of the initrd */
299 while (ramdisk_size) {
300 slop = ramdisk_image & ~PAGE_MASK;
301 clen = ramdisk_size;
302 if (clen > MAX_MAP_CHUNK-slop)
303 clen = MAX_MAP_CHUNK-slop;
304 mapaddr = ramdisk_image & PAGE_MASK;
305 p = early_memremap(mapaddr, clen+slop);
306 memcpy(q, p+slop, clen);
307 early_iounmap(p, clen+slop);
308 q += clen;
309 ramdisk_image += clen;
310 ramdisk_size -= clen;
311 }
312 /* high pages is not converted by early_res_to_bootmem */
313 ramdisk_image = boot_params.hdr.ramdisk_image;
314 ramdisk_size = boot_params.hdr.ramdisk_size;
315 printk(KERN_INFO "Move RAMDISK from %016llx - %016llx to"
316 " %08llx - %08llx\n",
317 ramdisk_image, ramdisk_image + ramdisk_size - 1,
318 ramdisk_here, ramdisk_here + ramdisk_size - 1);
319 }
320 #endif
321
322 static void __init reserve_initrd(void)
323 {
324 u64 ramdisk_image = boot_params.hdr.ramdisk_image;
325 u64 ramdisk_size = boot_params.hdr.ramdisk_size;
326 u64 ramdisk_end = ramdisk_image + ramdisk_size;
327 u64 end_of_lowmem = max_low_pfn << PAGE_SHIFT;
328
329 if (!boot_params.hdr.type_of_loader ||
330 !ramdisk_image || !ramdisk_size)
331 return; /* No initrd provided by bootloader */
332
333 initrd_start = 0;
334
335 if (ramdisk_size >= (end_of_lowmem>>1)) {
336 free_early(ramdisk_image, ramdisk_end);
337 printk(KERN_ERR "initrd too large to handle, "
338 "disabling initrd\n");
339 return;
340 }
341
342 printk(KERN_INFO "RAMDISK: %08llx - %08llx\n", ramdisk_image,
343 ramdisk_end);
344
345
346 if (ramdisk_end <= end_of_lowmem) {
347 /* All in lowmem, easy case */
348 /*
349 * don't need to reserve again, already reserved early
350 * in i386_start_kernel
351 */
352 initrd_start = ramdisk_image + PAGE_OFFSET;
353 initrd_end = initrd_start + ramdisk_size;
354 return;
355 }
356
357 #ifdef CONFIG_X86_32
358 relocate_initrd();
359 #else
360 printk(KERN_ERR "initrd extends beyond end of memory "
361 "(0x%08llx > 0x%08llx)\ndisabling initrd\n",
362 ramdisk_end, end_of_lowmem);
363 initrd_start = 0;
364 #endif
365 free_early(ramdisk_image, ramdisk_end);
366 }
367 #else
368 static void __init reserve_initrd(void)
369 {
370 }
371 #endif /* CONFIG_BLK_DEV_INITRD */
372
373 static void __init parse_setup_data(void)
374 {
375 struct setup_data *data;
376 u64 pa_data;
377
378 if (boot_params.hdr.version < 0x0209)
379 return;
380 pa_data = boot_params.hdr.setup_data;
381 while (pa_data) {
382 data = early_memremap(pa_data, PAGE_SIZE);
383 switch (data->type) {
384 case SETUP_E820_EXT:
385 parse_e820_ext(data, pa_data);
386 break;
387 default:
388 break;
389 }
390 pa_data = data->next;
391 early_iounmap(data, PAGE_SIZE);
392 }
393 }
394
395 static void __init e820_reserve_setup_data(void)
396 {
397 struct setup_data *data;
398 u64 pa_data;
399 int found = 0;
400
401 if (boot_params.hdr.version < 0x0209)
402 return;
403 pa_data = boot_params.hdr.setup_data;
404 while (pa_data) {
405 data = early_memremap(pa_data, sizeof(*data));
406 e820_update_range(pa_data, sizeof(*data)+data->len,
407 E820_RAM, E820_RESERVED_KERN);
408 found = 1;
409 pa_data = data->next;
410 early_iounmap(data, sizeof(*data));
411 }
412 if (!found)
413 return;
414
415 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
416 memcpy(&e820_saved, &e820, sizeof(struct e820map));
417 printk(KERN_INFO "extended physical RAM map:\n");
418 e820_print_map("reserve setup_data");
419 }
420
421 static void __init reserve_early_setup_data(void)
422 {
423 struct setup_data *data;
424 u64 pa_data;
425 char buf[32];
426
427 if (boot_params.hdr.version < 0x0209)
428 return;
429 pa_data = boot_params.hdr.setup_data;
430 while (pa_data) {
431 data = early_memremap(pa_data, sizeof(*data));
432 sprintf(buf, "setup data %x", data->type);
433 reserve_early(pa_data, pa_data+sizeof(*data)+data->len, buf);
434 pa_data = data->next;
435 early_iounmap(data, sizeof(*data));
436 }
437 }
438
439 /*
440 * --------- Crashkernel reservation ------------------------------
441 */
442
443 #ifdef CONFIG_KEXEC
444
445 /**
446 * Reserve @size bytes of crashkernel memory at any suitable offset.
447 *
448 * @size: Size of the crashkernel memory to reserve.
449 * Returns the base address on success, and -1ULL on failure.
450 */
451 unsigned long long __init find_and_reserve_crashkernel(unsigned long long size)
452 {
453 const unsigned long long alignment = 16<<20; /* 16M */
454 unsigned long long start = 0LL;
455
456 while (1) {
457 int ret;
458
459 start = find_e820_area(start, ULONG_MAX, size, alignment);
460 if (start == -1ULL)
461 return start;
462
463 /* try to reserve it */
464 ret = reserve_bootmem_generic(start, size, BOOTMEM_EXCLUSIVE);
465 if (ret >= 0)
466 return start;
467
468 start += alignment;
469 }
470 }
471
472 static inline unsigned long long get_total_mem(void)
473 {
474 unsigned long long total;
475
476 total = max_low_pfn - min_low_pfn;
477 #ifdef CONFIG_HIGHMEM
478 total += highend_pfn - highstart_pfn;
479 #endif
480
481 return total << PAGE_SHIFT;
482 }
483
484 static void __init reserve_crashkernel(void)
485 {
486 unsigned long long total_mem;
487 unsigned long long crash_size, crash_base;
488 int ret;
489
490 total_mem = get_total_mem();
491
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 /* 0 means: find the address automatically */
498 if (crash_base <= 0) {
499 crash_base = find_and_reserve_crashkernel(crash_size);
500 if (crash_base == -1ULL) {
501 pr_info("crashkernel reservation failed. "
502 "No suitable area found.\n");
503 return;
504 }
505 } else {
506 ret = reserve_bootmem_generic(crash_base, crash_size,
507 BOOTMEM_EXCLUSIVE);
508 if (ret < 0) {
509 pr_info("crashkernel reservation failed - "
510 "memory is in use\n");
511 return;
512 }
513 }
514
515 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
516 "for crashkernel (System RAM: %ldMB)\n",
517 (unsigned long)(crash_size >> 20),
518 (unsigned long)(crash_base >> 20),
519 (unsigned long)(total_mem >> 20));
520
521 crashk_res.start = crash_base;
522 crashk_res.end = crash_base + crash_size - 1;
523 insert_resource(&iomem_resource, &crashk_res);
524 }
525 #else
526 static void __init reserve_crashkernel(void)
527 {
528 }
529 #endif
530
531 static struct resource standard_io_resources[] = {
532 { .name = "dma1", .start = 0x00, .end = 0x1f,
533 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
534 { .name = "pic1", .start = 0x20, .end = 0x21,
535 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
536 { .name = "timer0", .start = 0x40, .end = 0x43,
537 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
538 { .name = "timer1", .start = 0x50, .end = 0x53,
539 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
540 { .name = "keyboard", .start = 0x60, .end = 0x60,
541 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
542 { .name = "keyboard", .start = 0x64, .end = 0x64,
543 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
544 { .name = "dma page reg", .start = 0x80, .end = 0x8f,
545 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
546 { .name = "pic2", .start = 0xa0, .end = 0xa1,
547 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
548 { .name = "dma2", .start = 0xc0, .end = 0xdf,
549 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
550 { .name = "fpu", .start = 0xf0, .end = 0xff,
551 .flags = IORESOURCE_BUSY | IORESOURCE_IO }
552 };
553
554 static void __init reserve_standard_io_resources(void)
555 {
556 int i;
557
558 /* request I/O space for devices used on all i[345]86 PCs */
559 for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
560 request_resource(&ioport_resource, &standard_io_resources[i]);
561
562 }
563
564 #ifdef CONFIG_PROC_VMCORE
565 /* elfcorehdr= specifies the location of elf core header
566 * stored by the crashed kernel. This option will be passed
567 * by kexec loader to the capture kernel.
568 */
569 static int __init setup_elfcorehdr(char *arg)
570 {
571 char *end;
572 if (!arg)
573 return -EINVAL;
574 elfcorehdr_addr = memparse(arg, &end);
575 return end > arg ? 0 : -EINVAL;
576 }
577 early_param("elfcorehdr", setup_elfcorehdr);
578 #endif
579
580 static struct x86_quirks default_x86_quirks __initdata;
581
582 struct x86_quirks *x86_quirks __initdata = &default_x86_quirks;
583
584 /*
585 * Some BIOSes seem to corrupt the low 64k of memory during events
586 * like suspend/resume and unplugging an HDMI cable. Reserve all
587 * remaining free memory in that area and fill it with a distinct
588 * pattern.
589 */
590 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
591 #define MAX_SCAN_AREAS 8
592
593 static int __read_mostly memory_corruption_check = -1;
594
595 static unsigned __read_mostly corruption_check_size = 64*1024;
596 static unsigned __read_mostly corruption_check_period = 60; /* seconds */
597
598 static struct e820entry scan_areas[MAX_SCAN_AREAS];
599 static int num_scan_areas;
600
601
602 static int set_corruption_check(char *arg)
603 {
604 char *end;
605
606 memory_corruption_check = simple_strtol(arg, &end, 10);
607
608 return (*end == 0) ? 0 : -EINVAL;
609 }
610 early_param("memory_corruption_check", set_corruption_check);
611
612 static int set_corruption_check_period(char *arg)
613 {
614 char *end;
615
616 corruption_check_period = simple_strtoul(arg, &end, 10);
617
618 return (*end == 0) ? 0 : -EINVAL;
619 }
620 early_param("memory_corruption_check_period", set_corruption_check_period);
621
622 static int set_corruption_check_size(char *arg)
623 {
624 char *end;
625 unsigned size;
626
627 size = memparse(arg, &end);
628
629 if (*end == '\0')
630 corruption_check_size = size;
631
632 return (size == corruption_check_size) ? 0 : -EINVAL;
633 }
634 early_param("memory_corruption_check_size", set_corruption_check_size);
635
636
637 static void __init setup_bios_corruption_check(void)
638 {
639 u64 addr = PAGE_SIZE; /* assume first page is reserved anyway */
640
641 if (memory_corruption_check == -1) {
642 memory_corruption_check =
643 #ifdef CONFIG_X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK
644 1
645 #else
646 0
647 #endif
648 ;
649 }
650
651 if (corruption_check_size == 0)
652 memory_corruption_check = 0;
653
654 if (!memory_corruption_check)
655 return;
656
657 corruption_check_size = round_up(corruption_check_size, PAGE_SIZE);
658
659 while(addr < corruption_check_size && num_scan_areas < MAX_SCAN_AREAS) {
660 u64 size;
661 addr = find_e820_area_size(addr, &size, PAGE_SIZE);
662
663 if (addr == 0)
664 break;
665
666 if ((addr + size) > corruption_check_size)
667 size = corruption_check_size - addr;
668
669 if (size == 0)
670 break;
671
672 e820_update_range(addr, size, E820_RAM, E820_RESERVED);
673 scan_areas[num_scan_areas].addr = addr;
674 scan_areas[num_scan_areas].size = size;
675 num_scan_areas++;
676
677 /* Assume we've already mapped this early memory */
678 memset(__va(addr), 0, size);
679
680 addr += size;
681 }
682
683 printk(KERN_INFO "Scanning %d areas for low memory corruption\n",
684 num_scan_areas);
685 update_e820();
686 }
687
688 static struct timer_list periodic_check_timer;
689
690 void check_for_bios_corruption(void)
691 {
692 int i;
693 int corruption = 0;
694
695 if (!memory_corruption_check)
696 return;
697
698 for(i = 0; i < num_scan_areas; i++) {
699 unsigned long *addr = __va(scan_areas[i].addr);
700 unsigned long size = scan_areas[i].size;
701
702 for(; size; addr++, size -= sizeof(unsigned long)) {
703 if (!*addr)
704 continue;
705 printk(KERN_ERR "Corrupted low memory at %p (%lx phys) = %08lx\n",
706 addr, __pa(addr), *addr);
707 corruption = 1;
708 *addr = 0;
709 }
710 }
711
712 WARN(corruption, KERN_ERR "Memory corruption detected in low memory\n");
713 }
714
715 static void periodic_check_for_corruption(unsigned long data)
716 {
717 check_for_bios_corruption();
718 mod_timer(&periodic_check_timer, round_jiffies(jiffies + corruption_check_period*HZ));
719 }
720
721 void start_periodic_check_for_corruption(void)
722 {
723 if (!memory_corruption_check || corruption_check_period == 0)
724 return;
725
726 printk(KERN_INFO "Scanning for low memory corruption every %d seconds\n",
727 corruption_check_period);
728
729 init_timer(&periodic_check_timer);
730 periodic_check_timer.function = &periodic_check_for_corruption;
731 periodic_check_for_corruption(0);
732 }
733 #endif
734
735 static int __init dmi_low_memory_corruption(const struct dmi_system_id *d)
736 {
737 printk(KERN_NOTICE
738 "%s detected: BIOS may corrupt low RAM, working it around.\n",
739 d->ident);
740
741 e820_update_range(0, 0x10000, E820_RAM, E820_RESERVED);
742 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
743
744 return 0;
745 }
746
747 /* List of systems that have known low memory corruption BIOS problems */
748 static struct dmi_system_id __initdata bad_bios_dmi_table[] = {
749 #ifdef CONFIG_X86_RESERVE_LOW_64K
750 {
751 .callback = dmi_low_memory_corruption,
752 .ident = "AMI BIOS",
753 .matches = {
754 DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
755 },
756 },
757 {
758 .callback = dmi_low_memory_corruption,
759 .ident = "Phoenix BIOS",
760 .matches = {
761 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies, LTD"),
762 },
763 },
764 #endif
765 {}
766 };
767
768 /*
769 * Determine if we were loaded by an EFI loader. If so, then we have also been
770 * passed the efi memmap, systab, etc., so we should use these data structures
771 * for initialization. Note, the efi init code path is determined by the
772 * global efi_enabled. This allows the same kernel image to be used on existing
773 * systems (with a traditional BIOS) as well as on EFI systems.
774 */
775 /*
776 * setup_arch - architecture-specific boot-time initializations
777 *
778 * Note: On x86_64, fixmaps are ready for use even before this is called.
779 */
780
781 void __init setup_arch(char **cmdline_p)
782 {
783 #ifdef CONFIG_X86_32
784 memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
785 visws_early_detect();
786 pre_setup_arch_hook();
787 #else
788 printk(KERN_INFO "Command line: %s\n", boot_command_line);
789 #endif
790
791 early_cpu_init();
792 early_ioremap_init();
793
794 ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
795 screen_info = boot_params.screen_info;
796 edid_info = boot_params.edid_info;
797 #ifdef CONFIG_X86_32
798 apm_info.bios = boot_params.apm_bios_info;
799 ist_info = boot_params.ist_info;
800 if (boot_params.sys_desc_table.length != 0) {
801 set_mca_bus(boot_params.sys_desc_table.table[3] & 0x2);
802 machine_id = boot_params.sys_desc_table.table[0];
803 machine_submodel_id = boot_params.sys_desc_table.table[1];
804 BIOS_revision = boot_params.sys_desc_table.table[2];
805 }
806 #endif
807 saved_video_mode = boot_params.hdr.vid_mode;
808 bootloader_type = boot_params.hdr.type_of_loader;
809
810 #ifdef CONFIG_BLK_DEV_RAM
811 rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
812 rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
813 rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
814 #endif
815 #ifdef CONFIG_EFI
816 if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
817 #ifdef CONFIG_X86_32
818 "EL32",
819 #else
820 "EL64",
821 #endif
822 4)) {
823 efi_enabled = 1;
824 efi_reserve_early();
825 }
826 #endif
827
828 ARCH_SETUP
829
830 setup_memory_map();
831 parse_setup_data();
832 /* update the e820_saved too */
833 e820_reserve_setup_data();
834
835 copy_edd();
836
837 if (!boot_params.hdr.root_flags)
838 root_mountflags &= ~MS_RDONLY;
839 init_mm.start_code = (unsigned long) _text;
840 init_mm.end_code = (unsigned long) _etext;
841 init_mm.end_data = (unsigned long) _edata;
842 #ifdef CONFIG_X86_32
843 init_mm.brk = init_pg_tables_end + PAGE_OFFSET;
844 #else
845 init_mm.brk = (unsigned long) &_end;
846 #endif
847
848 code_resource.start = virt_to_phys(_text);
849 code_resource.end = virt_to_phys(_etext)-1;
850 data_resource.start = virt_to_phys(_etext);
851 data_resource.end = virt_to_phys(_edata)-1;
852 bss_resource.start = virt_to_phys(&__bss_start);
853 bss_resource.end = virt_to_phys(&__bss_stop)-1;
854
855 #ifdef CONFIG_CMDLINE_BOOL
856 #ifdef CONFIG_CMDLINE_OVERRIDE
857 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
858 #else
859 if (builtin_cmdline[0]) {
860 /* append boot loader cmdline to builtin */
861 strlcat(builtin_cmdline, " ", COMMAND_LINE_SIZE);
862 strlcat(builtin_cmdline, boot_command_line, COMMAND_LINE_SIZE);
863 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
864 }
865 #endif
866 #endif
867
868 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
869 *cmdline_p = command_line;
870
871 parse_early_param();
872
873 #ifdef CONFIG_X86_64
874 check_efer();
875 #endif
876
877 #if defined(CONFIG_VMI) && defined(CONFIG_X86_32)
878 /*
879 * Must be before kernel pagetables are setup
880 * or fixmap area is touched.
881 */
882 vmi_init();
883 #endif
884
885 /* after early param, so could get panic from serial */
886 reserve_early_setup_data();
887
888 if (acpi_mps_check()) {
889 #ifdef CONFIG_X86_LOCAL_APIC
890 disable_apic = 1;
891 #endif
892 setup_clear_cpu_cap(X86_FEATURE_APIC);
893 }
894
895 #ifdef CONFIG_PCI
896 if (pci_early_dump_regs)
897 early_dump_pci_devices();
898 #endif
899
900 finish_e820_parsing();
901
902 dmi_scan_machine();
903
904 dmi_check_system(bad_bios_dmi_table);
905
906 #ifdef CONFIG_X86_32
907 probe_roms();
908 #endif
909
910 /* after parse_early_param, so could debug it */
911 insert_resource(&iomem_resource, &code_resource);
912 insert_resource(&iomem_resource, &data_resource);
913 insert_resource(&iomem_resource, &bss_resource);
914
915 if (efi_enabled)
916 efi_init();
917
918 #ifdef CONFIG_X86_32
919 if (ppro_with_ram_bug()) {
920 e820_update_range(0x70000000ULL, 0x40000ULL, E820_RAM,
921 E820_RESERVED);
922 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
923 printk(KERN_INFO "fixed physical RAM map:\n");
924 e820_print_map("bad_ppro");
925 }
926 #else
927 early_gart_iommu_check();
928 #endif
929
930 /*
931 * partially used pages are not usable - thus
932 * we are rounding upwards:
933 */
934 max_pfn = e820_end_of_ram_pfn();
935
936 /* preallocate 4k for mptable mpc */
937 early_reserve_e820_mpc_new();
938 /* update e820 for memory not covered by WB MTRRs */
939 mtrr_bp_init();
940 if (mtrr_trim_uncached_memory(max_pfn))
941 max_pfn = e820_end_of_ram_pfn();
942
943 #ifdef CONFIG_X86_32
944 /* max_low_pfn get updated here */
945 find_low_pfn_range();
946 #else
947 num_physpages = max_pfn;
948
949 if (cpu_has_x2apic)
950 check_x2apic();
951
952 /* How many end-of-memory variables you have, grandma! */
953 /* need this before calling reserve_initrd */
954 if (max_pfn > (1UL<<(32 - PAGE_SHIFT)))
955 max_low_pfn = e820_end_of_low_ram_pfn();
956 else
957 max_low_pfn = max_pfn;
958
959 high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
960 #endif
961
962 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
963 setup_bios_corruption_check();
964 #endif
965
966 /* max_pfn_mapped is updated here */
967 max_low_pfn_mapped = init_memory_mapping(0, max_low_pfn<<PAGE_SHIFT);
968 max_pfn_mapped = max_low_pfn_mapped;
969
970 #ifdef CONFIG_X86_64
971 if (max_pfn > max_low_pfn) {
972 max_pfn_mapped = init_memory_mapping(1UL<<32,
973 max_pfn<<PAGE_SHIFT);
974 /* can we preseve max_low_pfn ?*/
975 max_low_pfn = max_pfn;
976 }
977 #endif
978
979 /*
980 * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
981 */
982
983 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
984 if (init_ohci1394_dma_early)
985 init_ohci1394_dma_on_all_controllers();
986 #endif
987
988 reserve_initrd();
989
990 #ifdef CONFIG_X86_64
991 vsmp_init();
992 #endif
993
994 io_delay_init();
995
996 /*
997 * Parse the ACPI tables for possible boot-time SMP configuration.
998 */
999 acpi_boot_table_init();
1000
1001 early_acpi_boot_init();
1002
1003 #ifdef CONFIG_ACPI_NUMA
1004 /*
1005 * Parse SRAT to discover nodes.
1006 */
1007 acpi_numa_init();
1008 #endif
1009
1010 initmem_init(0, max_pfn);
1011
1012 #ifdef CONFIG_ACPI_SLEEP
1013 /*
1014 * Reserve low memory region for sleep support.
1015 */
1016 acpi_reserve_bootmem();
1017 #endif
1018 #ifdef CONFIG_X86_FIND_SMP_CONFIG
1019 /*
1020 * Find and reserve possible boot-time SMP configuration:
1021 */
1022 find_smp_config();
1023 #endif
1024 reserve_crashkernel();
1025
1026 #ifdef CONFIG_X86_64
1027 /*
1028 * dma32_reserve_bootmem() allocates bootmem which may conflict
1029 * with the crashkernel command line, so do that after
1030 * reserve_crashkernel()
1031 */
1032 dma32_reserve_bootmem();
1033 #endif
1034
1035 reserve_ibft_region();
1036
1037 #ifdef CONFIG_KVM_CLOCK
1038 kvmclock_init();
1039 #endif
1040
1041 paravirt_pagetable_setup_start(swapper_pg_dir);
1042 paging_init();
1043 paravirt_pagetable_setup_done(swapper_pg_dir);
1044 paravirt_post_allocator_init();
1045
1046 #ifdef CONFIG_X86_64
1047 map_vsyscall();
1048 #endif
1049
1050 #ifdef CONFIG_X86_GENERICARCH
1051 generic_apic_probe();
1052 #endif
1053
1054 early_quirks();
1055
1056 /*
1057 * Read APIC and some other early information from ACPI tables.
1058 */
1059 acpi_boot_init();
1060
1061 #if defined(CONFIG_X86_MPPARSE) || defined(CONFIG_X86_VISWS)
1062 /*
1063 * get boot-time SMP configuration:
1064 */
1065 if (smp_found_config)
1066 get_smp_config();
1067 #endif
1068
1069 prefill_possible_map();
1070
1071 #ifdef CONFIG_X86_64
1072 /* need to wait for nr_cpu_ids settle down */
1073 if (nr_irqs == NR_IRQS)
1074 nr_irqs = 32 * nr_cpu_ids + 224;
1075 init_cpu_to_node();
1076 #endif
1077
1078 init_apic_mappings();
1079 ioapic_init_mappings();
1080
1081 kvm_guest_init();
1082
1083 e820_reserve_resources();
1084 e820_mark_nosave_regions(max_low_pfn);
1085
1086 #ifdef CONFIG_X86_32
1087 request_resource(&iomem_resource, &video_ram_resource);
1088 #endif
1089 reserve_standard_io_resources();
1090
1091 e820_setup_gap();
1092
1093 #ifdef CONFIG_VT
1094 #if defined(CONFIG_VGA_CONSOLE)
1095 if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
1096 conswitchp = &vga_con;
1097 #elif defined(CONFIG_DUMMY_CONSOLE)
1098 conswitchp = &dummy_con;
1099 #endif
1100 #endif
1101 }
1102
1103
Linux kernel - Deliverables
This page took 0.051422 seconds and 4 git commands to generate.