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Merge git://git.kernel.org/pub/scm/linux/kernel/git/wim/linux-2.6-watchdog
[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/sfi.h>
31 #include <linux/apm_bios.h>
32 #include <linux/initrd.h>
33 #include <linux/bootmem.h>
34 #include <linux/memblock.h>
35 #include <linux/seq_file.h>
36 #include <linux/console.h>
37 #include <linux/mca.h>
38 #include <linux/root_dev.h>
39 #include <linux/highmem.h>
40 #include <linux/module.h>
41 #include <linux/efi.h>
42 #include <linux/init.h>
43 #include <linux/edd.h>
44 #include <linux/iscsi_ibft.h>
45 #include <linux/nodemask.h>
46 #include <linux/kexec.h>
47 #include <linux/dmi.h>
48 #include <linux/pfn.h>
49 #include <linux/pci.h>
50 #include <asm/pci-direct.h>
51 #include <linux/init_ohci1394_dma.h>
52 #include <linux/kvm_para.h>
53
54 #include <linux/errno.h>
55 #include <linux/kernel.h>
56 #include <linux/stddef.h>
57 #include <linux/unistd.h>
58 #include <linux/ptrace.h>
59 #include <linux/user.h>
60 #include <linux/delay.h>
61
62 #include <linux/kallsyms.h>
63 #include <linux/cpufreq.h>
64 #include <linux/dma-mapping.h>
65 #include <linux/ctype.h>
66 #include <linux/uaccess.h>
67
68 #include <linux/percpu.h>
69 #include <linux/crash_dump.h>
70 #include <linux/tboot.h>
71
72 #include <video/edid.h>
73
74 #include <asm/mtrr.h>
75 #include <asm/apic.h>
76 #include <asm/trampoline.h>
77 #include <asm/e820.h>
78 #include <asm/mpspec.h>
79 #include <asm/setup.h>
80 #include <asm/efi.h>
81 #include <asm/timer.h>
82 #include <asm/i8259.h>
83 #include <asm/sections.h>
84 #include <asm/dmi.h>
85 #include <asm/io_apic.h>
86 #include <asm/ist.h>
87 #include <asm/setup_arch.h>
88 #include <asm/bios_ebda.h>
89 #include <asm/cacheflush.h>
90 #include <asm/processor.h>
91 #include <asm/bugs.h>
92
93 #include <asm/system.h>
94 #include <asm/vsyscall.h>
95 #include <asm/cpu.h>
96 #include <asm/desc.h>
97 #include <asm/dma.h>
98 #include <asm/iommu.h>
99 #include <asm/gart.h>
100 #include <asm/mmu_context.h>
101 #include <asm/proto.h>
102
103 #include <asm/paravirt.h>
104 #include <asm/hypervisor.h>
105 #include <asm/olpc_ofw.h>
106
107 #include <asm/percpu.h>
108 #include <asm/topology.h>
109 #include <asm/apicdef.h>
110 #include <asm/amd_nb.h>
111 #ifdef CONFIG_X86_64
112 #include <asm/numa_64.h>
113 #endif
114 #include <asm/mce.h>
115 #include <asm/alternative.h>
116 #include <asm/prom.h>
117
118 /*
119 * end_pfn only includes RAM, while max_pfn_mapped includes all e820 entries.
120 * The direct mapping extends to max_pfn_mapped, so that we can directly access
121 * apertures, ACPI and other tables without having to play with fixmaps.
122 */
123 unsigned long max_low_pfn_mapped;
124 unsigned long max_pfn_mapped;
125
126 #ifdef CONFIG_DMI
127 RESERVE_BRK(dmi_alloc, 65536);
128 #endif
129
130
131 static __initdata unsigned long _brk_start = (unsigned long)__brk_base;
132 unsigned long _brk_end = (unsigned long)__brk_base;
133
134 #ifdef CONFIG_X86_64
135 int default_cpu_present_to_apicid(int mps_cpu)
136 {
137 return __default_cpu_present_to_apicid(mps_cpu);
138 }
139
140 int default_check_phys_apicid_present(int phys_apicid)
141 {
142 return __default_check_phys_apicid_present(phys_apicid);
143 }
144 #endif
145
146 #ifndef CONFIG_DEBUG_BOOT_PARAMS
147 struct boot_params __initdata boot_params;
148 #else
149 struct boot_params boot_params;
150 #endif
151
152 /*
153 * Machine setup..
154 */
155 static struct resource data_resource = {
156 .name = "Kernel data",
157 .start = 0,
158 .end = 0,
159 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
160 };
161
162 static struct resource code_resource = {
163 .name = "Kernel code",
164 .start = 0,
165 .end = 0,
166 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
167 };
168
169 static struct resource bss_resource = {
170 .name = "Kernel bss",
171 .start = 0,
172 .end = 0,
173 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
174 };
175
176
177 #ifdef CONFIG_X86_32
178 /* cpu data as detected by the assembly code in head.S */
179 struct cpuinfo_x86 new_cpu_data __cpuinitdata = {0, 0, 0, 0, -1, 1, 0, 0, -1};
180 /* common cpu data for all cpus */
181 struct cpuinfo_x86 boot_cpu_data __read_mostly = {0, 0, 0, 0, -1, 1, 0, 0, -1};
182 EXPORT_SYMBOL(boot_cpu_data);
183 static void set_mca_bus(int x)
184 {
185 #ifdef CONFIG_MCA
186 MCA_bus = x;
187 #endif
188 }
189
190 unsigned int def_to_bigsmp;
191
192 /* for MCA, but anyone else can use it if they want */
193 unsigned int machine_id;
194 unsigned int machine_submodel_id;
195 unsigned int BIOS_revision;
196
197 struct apm_info apm_info;
198 EXPORT_SYMBOL(apm_info);
199
200 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
201 defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
202 struct ist_info ist_info;
203 EXPORT_SYMBOL(ist_info);
204 #else
205 struct ist_info ist_info;
206 #endif
207
208 #else
209 struct cpuinfo_x86 boot_cpu_data __read_mostly = {
210 .x86_phys_bits = MAX_PHYSMEM_BITS,
211 };
212 EXPORT_SYMBOL(boot_cpu_data);
213 #endif
214
215
216 #if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64)
217 unsigned long mmu_cr4_features;
218 #else
219 unsigned long mmu_cr4_features = X86_CR4_PAE;
220 #endif
221
222 /* Boot loader ID and version as integers, for the benefit of proc_dointvec */
223 int bootloader_type, bootloader_version;
224
225 /*
226 * Setup options
227 */
228 struct screen_info screen_info;
229 EXPORT_SYMBOL(screen_info);
230 struct edid_info edid_info;
231 EXPORT_SYMBOL_GPL(edid_info);
232
233 extern int root_mountflags;
234
235 unsigned long saved_video_mode;
236
237 #define RAMDISK_IMAGE_START_MASK 0x07FF
238 #define RAMDISK_PROMPT_FLAG 0x8000
239 #define RAMDISK_LOAD_FLAG 0x4000
240
241 static char __initdata command_line[COMMAND_LINE_SIZE];
242 #ifdef CONFIG_CMDLINE_BOOL
243 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
244 #endif
245
246 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
247 struct edd edd;
248 #ifdef CONFIG_EDD_MODULE
249 EXPORT_SYMBOL(edd);
250 #endif
251 /**
252 * copy_edd() - Copy the BIOS EDD information
253 * from boot_params into a safe place.
254 *
255 */
256 static inline void __init copy_edd(void)
257 {
258 memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer,
259 sizeof(edd.mbr_signature));
260 memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
261 edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
262 edd.edd_info_nr = boot_params.eddbuf_entries;
263 }
264 #else
265 static inline void __init copy_edd(void)
266 {
267 }
268 #endif
269
270 void * __init extend_brk(size_t size, size_t align)
271 {
272 size_t mask = align - 1;
273 void *ret;
274
275 BUG_ON(_brk_start == 0);
276 BUG_ON(align & mask);
277
278 _brk_end = (_brk_end + mask) & ~mask;
279 BUG_ON((char *)(_brk_end + size) > __brk_limit);
280
281 ret = (void *)_brk_end;
282 _brk_end += size;
283
284 memset(ret, 0, size);
285
286 return ret;
287 }
288
289 #ifdef CONFIG_X86_64
290 static void __init init_gbpages(void)
291 {
292 if (direct_gbpages && cpu_has_gbpages)
293 printk(KERN_INFO "Using GB pages for direct mapping\n");
294 else
295 direct_gbpages = 0;
296 }
297
298 static void __init cleanup_highmap_brk_end(void)
299 {
300 pud_t *pud;
301 pmd_t *pmd;
302
303 mmu_cr4_features = read_cr4();
304
305 /*
306 * _brk_end cannot change anymore, but it and _end may be
307 * located on different 2M pages. cleanup_highmap(), however,
308 * can only consider _end when it runs, so destroy any
309 * mappings beyond _brk_end here.
310 */
311 pud = pud_offset(pgd_offset_k(_brk_end), _brk_end);
312 pmd = pmd_offset(pud, _brk_end - 1);
313 while (++pmd <= pmd_offset(pud, (unsigned long)_end - 1))
314 pmd_clear(pmd);
315 }
316 #else
317 static inline void init_gbpages(void)
318 {
319 }
320 static inline void cleanup_highmap_brk_end(void)
321 {
322 }
323 #endif
324
325 static void __init reserve_brk(void)
326 {
327 if (_brk_end > _brk_start)
328 memblock_x86_reserve_range(__pa(_brk_start), __pa(_brk_end), "BRK");
329
330 /* Mark brk area as locked down and no longer taking any
331 new allocations */
332 _brk_start = 0;
333
334 cleanup_highmap_brk_end();
335 }
336
337 #ifdef CONFIG_BLK_DEV_INITRD
338
339 #define MAX_MAP_CHUNK (NR_FIX_BTMAPS << PAGE_SHIFT)
340 static void __init relocate_initrd(void)
341 {
342 /* Assume only end is not page aligned */
343 u64 ramdisk_image = boot_params.hdr.ramdisk_image;
344 u64 ramdisk_size = boot_params.hdr.ramdisk_size;
345 u64 area_size = PAGE_ALIGN(ramdisk_size);
346 u64 end_of_lowmem = max_low_pfn_mapped << PAGE_SHIFT;
347 u64 ramdisk_here;
348 unsigned long slop, clen, mapaddr;
349 char *p, *q;
350
351 /* We need to move the initrd down into lowmem */
352 ramdisk_here = memblock_find_in_range(0, end_of_lowmem, area_size,
353 PAGE_SIZE);
354
355 if (ramdisk_here == MEMBLOCK_ERROR)
356 panic("Cannot find place for new RAMDISK of size %lld\n",
357 ramdisk_size);
358
359 /* Note: this includes all the lowmem currently occupied by
360 the initrd, we rely on that fact to keep the data intact. */
361 memblock_x86_reserve_range(ramdisk_here, ramdisk_here + area_size, "NEW RAMDISK");
362 initrd_start = ramdisk_here + PAGE_OFFSET;
363 initrd_end = initrd_start + ramdisk_size;
364 printk(KERN_INFO "Allocated new RAMDISK: %08llx - %08llx\n",
365 ramdisk_here, ramdisk_here + ramdisk_size);
366
367 q = (char *)initrd_start;
368
369 /* Copy any lowmem portion of the initrd */
370 if (ramdisk_image < end_of_lowmem) {
371 clen = end_of_lowmem - ramdisk_image;
372 p = (char *)__va(ramdisk_image);
373 memcpy(q, p, clen);
374 q += clen;
375 ramdisk_image += clen;
376 ramdisk_size -= clen;
377 }
378
379 /* Copy the highmem portion of the initrd */
380 while (ramdisk_size) {
381 slop = ramdisk_image & ~PAGE_MASK;
382 clen = ramdisk_size;
383 if (clen > MAX_MAP_CHUNK-slop)
384 clen = MAX_MAP_CHUNK-slop;
385 mapaddr = ramdisk_image & PAGE_MASK;
386 p = early_memremap(mapaddr, clen+slop);
387 memcpy(q, p+slop, clen);
388 early_iounmap(p, clen+slop);
389 q += clen;
390 ramdisk_image += clen;
391 ramdisk_size -= clen;
392 }
393 /* high pages is not converted by early_res_to_bootmem */
394 ramdisk_image = boot_params.hdr.ramdisk_image;
395 ramdisk_size = boot_params.hdr.ramdisk_size;
396 printk(KERN_INFO "Move RAMDISK from %016llx - %016llx to"
397 " %08llx - %08llx\n",
398 ramdisk_image, ramdisk_image + ramdisk_size - 1,
399 ramdisk_here, ramdisk_here + ramdisk_size - 1);
400 }
401
402 static void __init reserve_initrd(void)
403 {
404 /* Assume only end is not page aligned */
405 u64 ramdisk_image = boot_params.hdr.ramdisk_image;
406 u64 ramdisk_size = boot_params.hdr.ramdisk_size;
407 u64 ramdisk_end = PAGE_ALIGN(ramdisk_image + ramdisk_size);
408 u64 end_of_lowmem = max_low_pfn_mapped << PAGE_SHIFT;
409
410 if (!boot_params.hdr.type_of_loader ||
411 !ramdisk_image || !ramdisk_size)
412 return; /* No initrd provided by bootloader */
413
414 initrd_start = 0;
415
416 if (ramdisk_size >= (end_of_lowmem>>1)) {
417 memblock_x86_free_range(ramdisk_image, ramdisk_end);
418 printk(KERN_ERR "initrd too large to handle, "
419 "disabling initrd\n");
420 return;
421 }
422
423 printk(KERN_INFO "RAMDISK: %08llx - %08llx\n", ramdisk_image,
424 ramdisk_end);
425
426
427 if (ramdisk_end <= end_of_lowmem) {
428 /* All in lowmem, easy case */
429 /*
430 * don't need to reserve again, already reserved early
431 * in i386_start_kernel
432 */
433 initrd_start = ramdisk_image + PAGE_OFFSET;
434 initrd_end = initrd_start + ramdisk_size;
435 return;
436 }
437
438 relocate_initrd();
439
440 memblock_x86_free_range(ramdisk_image, ramdisk_end);
441 }
442 #else
443 static void __init reserve_initrd(void)
444 {
445 }
446 #endif /* CONFIG_BLK_DEV_INITRD */
447
448 static void __init parse_setup_data(void)
449 {
450 struct setup_data *data;
451 u64 pa_data;
452
453 if (boot_params.hdr.version < 0x0209)
454 return;
455 pa_data = boot_params.hdr.setup_data;
456 while (pa_data) {
457 u32 data_len, map_len;
458
459 map_len = max(PAGE_SIZE - (pa_data & ~PAGE_MASK),
460 (u64)sizeof(struct setup_data));
461 data = early_memremap(pa_data, map_len);
462 data_len = data->len + sizeof(struct setup_data);
463 if (data_len > map_len) {
464 early_iounmap(data, map_len);
465 data = early_memremap(pa_data, data_len);
466 map_len = data_len;
467 }
468
469 switch (data->type) {
470 case SETUP_E820_EXT:
471 parse_e820_ext(data);
472 break;
473 case SETUP_DTB:
474 add_dtb(pa_data);
475 break;
476 default:
477 break;
478 }
479 pa_data = data->next;
480 early_iounmap(data, map_len);
481 }
482 }
483
484 static void __init e820_reserve_setup_data(void)
485 {
486 struct setup_data *data;
487 u64 pa_data;
488 int found = 0;
489
490 if (boot_params.hdr.version < 0x0209)
491 return;
492 pa_data = boot_params.hdr.setup_data;
493 while (pa_data) {
494 data = early_memremap(pa_data, sizeof(*data));
495 e820_update_range(pa_data, sizeof(*data)+data->len,
496 E820_RAM, E820_RESERVED_KERN);
497 found = 1;
498 pa_data = data->next;
499 early_iounmap(data, sizeof(*data));
500 }
501 if (!found)
502 return;
503
504 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
505 memcpy(&e820_saved, &e820, sizeof(struct e820map));
506 printk(KERN_INFO "extended physical RAM map:\n");
507 e820_print_map("reserve setup_data");
508 }
509
510 static void __init memblock_x86_reserve_range_setup_data(void)
511 {
512 struct setup_data *data;
513 u64 pa_data;
514 char buf[32];
515
516 if (boot_params.hdr.version < 0x0209)
517 return;
518 pa_data = boot_params.hdr.setup_data;
519 while (pa_data) {
520 data = early_memremap(pa_data, sizeof(*data));
521 sprintf(buf, "setup data %x", data->type);
522 memblock_x86_reserve_range(pa_data, pa_data+sizeof(*data)+data->len, buf);
523 pa_data = data->next;
524 early_iounmap(data, sizeof(*data));
525 }
526 }
527
528 /*
529 * --------- Crashkernel reservation ------------------------------
530 */
531
532 #ifdef CONFIG_KEXEC
533
534 static inline unsigned long long get_total_mem(void)
535 {
536 unsigned long long total;
537
538 total = max_pfn - min_low_pfn;
539
540 return total << PAGE_SHIFT;
541 }
542
543 /*
544 * Keep the crash kernel below this limit. On 32 bits earlier kernels
545 * would limit the kernel to the low 512 MiB due to mapping restrictions.
546 * On 64 bits, kexec-tools currently limits us to 896 MiB; increase this
547 * limit once kexec-tools are fixed.
548 */
549 #ifdef CONFIG_X86_32
550 # define CRASH_KERNEL_ADDR_MAX (512 << 20)
551 #else
552 # define CRASH_KERNEL_ADDR_MAX (896 << 20)
553 #endif
554
555 static void __init reserve_crashkernel(void)
556 {
557 unsigned long long total_mem;
558 unsigned long long crash_size, crash_base;
559 int ret;
560
561 total_mem = get_total_mem();
562
563 ret = parse_crashkernel(boot_command_line, total_mem,
564 &crash_size, &crash_base);
565 if (ret != 0 || crash_size <= 0)
566 return;
567
568 /* 0 means: find the address automatically */
569 if (crash_base <= 0) {
570 const unsigned long long alignment = 16<<20; /* 16M */
571
572 /*
573 * kexec want bzImage is below CRASH_KERNEL_ADDR_MAX
574 */
575 crash_base = memblock_find_in_range(alignment,
576 CRASH_KERNEL_ADDR_MAX, crash_size, alignment);
577
578 if (crash_base == MEMBLOCK_ERROR) {
579 pr_info("crashkernel reservation failed - No suitable area found.\n");
580 return;
581 }
582 } else {
583 unsigned long long start;
584
585 start = memblock_find_in_range(crash_base,
586 crash_base + crash_size, crash_size, 1<<20);
587 if (start != crash_base) {
588 pr_info("crashkernel reservation failed - memory is in use.\n");
589 return;
590 }
591 }
592 memblock_x86_reserve_range(crash_base, crash_base + crash_size, "CRASH KERNEL");
593
594 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
595 "for crashkernel (System RAM: %ldMB)\n",
596 (unsigned long)(crash_size >> 20),
597 (unsigned long)(crash_base >> 20),
598 (unsigned long)(total_mem >> 20));
599
600 crashk_res.start = crash_base;
601 crashk_res.end = crash_base + crash_size - 1;
602 insert_resource(&iomem_resource, &crashk_res);
603 }
604 #else
605 static void __init reserve_crashkernel(void)
606 {
607 }
608 #endif
609
610 static struct resource standard_io_resources[] = {
611 { .name = "dma1", .start = 0x00, .end = 0x1f,
612 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
613 { .name = "pic1", .start = 0x20, .end = 0x21,
614 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
615 { .name = "timer0", .start = 0x40, .end = 0x43,
616 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
617 { .name = "timer1", .start = 0x50, .end = 0x53,
618 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
619 { .name = "keyboard", .start = 0x60, .end = 0x60,
620 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
621 { .name = "keyboard", .start = 0x64, .end = 0x64,
622 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
623 { .name = "dma page reg", .start = 0x80, .end = 0x8f,
624 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
625 { .name = "pic2", .start = 0xa0, .end = 0xa1,
626 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
627 { .name = "dma2", .start = 0xc0, .end = 0xdf,
628 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
629 { .name = "fpu", .start = 0xf0, .end = 0xff,
630 .flags = IORESOURCE_BUSY | IORESOURCE_IO }
631 };
632
633 void __init reserve_standard_io_resources(void)
634 {
635 int i;
636
637 /* request I/O space for devices used on all i[345]86 PCs */
638 for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
639 request_resource(&ioport_resource, &standard_io_resources[i]);
640
641 }
642
643 /*
644 * Note: elfcorehdr_addr is not just limited to vmcore. It is also used by
645 * is_kdump_kernel() to determine if we are booting after a panic. Hence
646 * ifdef it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE.
647 */
648
649 #ifdef CONFIG_CRASH_DUMP
650 /* elfcorehdr= specifies the location of elf core header
651 * stored by the crashed kernel. This option will be passed
652 * by kexec loader to the capture kernel.
653 */
654 static int __init setup_elfcorehdr(char *arg)
655 {
656 char *end;
657 if (!arg)
658 return -EINVAL;
659 elfcorehdr_addr = memparse(arg, &end);
660 return end > arg ? 0 : -EINVAL;
661 }
662 early_param("elfcorehdr", setup_elfcorehdr);
663 #endif
664
665 static __init void reserve_ibft_region(void)
666 {
667 unsigned long addr, size = 0;
668
669 addr = find_ibft_region(&size);
670
671 if (size)
672 memblock_x86_reserve_range(addr, addr + size, "* ibft");
673 }
674
675 static unsigned reserve_low = CONFIG_X86_RESERVE_LOW << 10;
676
677 static void __init trim_bios_range(void)
678 {
679 /*
680 * A special case is the first 4Kb of memory;
681 * This is a BIOS owned area, not kernel ram, but generally
682 * not listed as such in the E820 table.
683 *
684 * This typically reserves additional memory (64KiB by default)
685 * since some BIOSes are known to corrupt low memory. See the
686 * Kconfig help text for X86_RESERVE_LOW.
687 */
688 e820_update_range(0, ALIGN(reserve_low, PAGE_SIZE),
689 E820_RAM, E820_RESERVED);
690
691 /*
692 * special case: Some BIOSen report the PC BIOS
693 * area (640->1Mb) as ram even though it is not.
694 * take them out.
695 */
696 e820_remove_range(BIOS_BEGIN, BIOS_END - BIOS_BEGIN, E820_RAM, 1);
697 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
698 }
699
700 static int __init parse_reservelow(char *p)
701 {
702 unsigned long long size;
703
704 if (!p)
705 return -EINVAL;
706
707 size = memparse(p, &p);
708
709 if (size < 4096)
710 size = 4096;
711
712 if (size > 640*1024)
713 size = 640*1024;
714
715 reserve_low = size;
716
717 return 0;
718 }
719
720 early_param("reservelow", parse_reservelow);
721
722 /*
723 * Determine if we were loaded by an EFI loader. If so, then we have also been
724 * passed the efi memmap, systab, etc., so we should use these data structures
725 * for initialization. Note, the efi init code path is determined by the
726 * global efi_enabled. This allows the same kernel image to be used on existing
727 * systems (with a traditional BIOS) as well as on EFI systems.
728 */
729 /*
730 * setup_arch - architecture-specific boot-time initializations
731 *
732 * Note: On x86_64, fixmaps are ready for use even before this is called.
733 */
734
735 void __init setup_arch(char **cmdline_p)
736 {
737 unsigned long flags;
738
739 #ifdef CONFIG_X86_32
740 memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
741 visws_early_detect();
742
743 /*
744 * copy kernel address range established so far and switch
745 * to the proper swapper page table
746 */
747 clone_pgd_range(swapper_pg_dir + KERNEL_PGD_BOUNDARY,
748 initial_page_table + KERNEL_PGD_BOUNDARY,
749 KERNEL_PGD_PTRS);
750
751 load_cr3(swapper_pg_dir);
752 __flush_tlb_all();
753 #else
754 printk(KERN_INFO "Command line: %s\n", boot_command_line);
755 #endif
756
757 /*
758 * If we have OLPC OFW, we might end up relocating the fixmap due to
759 * reserve_top(), so do this before touching the ioremap area.
760 */
761 olpc_ofw_detect();
762
763 early_trap_init();
764 early_cpu_init();
765 early_ioremap_init();
766
767 setup_olpc_ofw_pgd();
768
769 ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
770 screen_info = boot_params.screen_info;
771 edid_info = boot_params.edid_info;
772 #ifdef CONFIG_X86_32
773 apm_info.bios = boot_params.apm_bios_info;
774 ist_info = boot_params.ist_info;
775 if (boot_params.sys_desc_table.length != 0) {
776 set_mca_bus(boot_params.sys_desc_table.table[3] & 0x2);
777 machine_id = boot_params.sys_desc_table.table[0];
778 machine_submodel_id = boot_params.sys_desc_table.table[1];
779 BIOS_revision = boot_params.sys_desc_table.table[2];
780 }
781 #endif
782 saved_video_mode = boot_params.hdr.vid_mode;
783 bootloader_type = boot_params.hdr.type_of_loader;
784 if ((bootloader_type >> 4) == 0xe) {
785 bootloader_type &= 0xf;
786 bootloader_type |= (boot_params.hdr.ext_loader_type+0x10) << 4;
787 }
788 bootloader_version = bootloader_type & 0xf;
789 bootloader_version |= boot_params.hdr.ext_loader_ver << 4;
790
791 #ifdef CONFIG_BLK_DEV_RAM
792 rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
793 rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
794 rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
795 #endif
796 #ifdef CONFIG_EFI
797 if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
798 #ifdef CONFIG_X86_32
799 "EL32",
800 #else
801 "EL64",
802 #endif
803 4)) {
804 efi_enabled = 1;
805 efi_memblock_x86_reserve_range();
806 }
807 #endif
808
809 x86_init.oem.arch_setup();
810
811 iomem_resource.end = (1ULL << boot_cpu_data.x86_phys_bits) - 1;
812 setup_memory_map();
813 parse_setup_data();
814 /* update the e820_saved too */
815 e820_reserve_setup_data();
816
817 copy_edd();
818
819 if (!boot_params.hdr.root_flags)
820 root_mountflags &= ~MS_RDONLY;
821 init_mm.start_code = (unsigned long) _text;
822 init_mm.end_code = (unsigned long) _etext;
823 init_mm.end_data = (unsigned long) _edata;
824 init_mm.brk = _brk_end;
825
826 code_resource.start = virt_to_phys(_text);
827 code_resource.end = virt_to_phys(_etext)-1;
828 data_resource.start = virt_to_phys(_etext);
829 data_resource.end = virt_to_phys(_edata)-1;
830 bss_resource.start = virt_to_phys(&__bss_start);
831 bss_resource.end = virt_to_phys(&__bss_stop)-1;
832
833 #ifdef CONFIG_CMDLINE_BOOL
834 #ifdef CONFIG_CMDLINE_OVERRIDE
835 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
836 #else
837 if (builtin_cmdline[0]) {
838 /* append boot loader cmdline to builtin */
839 strlcat(builtin_cmdline, " ", COMMAND_LINE_SIZE);
840 strlcat(builtin_cmdline, boot_command_line, COMMAND_LINE_SIZE);
841 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
842 }
843 #endif
844 #endif
845
846 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
847 *cmdline_p = command_line;
848
849 /*
850 * x86_configure_nx() is called before parse_early_param() to detect
851 * whether hardware doesn't support NX (so that the early EHCI debug
852 * console setup can safely call set_fixmap()). It may then be called
853 * again from within noexec_setup() during parsing early parameters
854 * to honor the respective command line option.
855 */
856 x86_configure_nx();
857
858 parse_early_param();
859
860 x86_report_nx();
861
862 /* after early param, so could get panic from serial */
863 memblock_x86_reserve_range_setup_data();
864
865 if (acpi_mps_check()) {
866 #ifdef CONFIG_X86_LOCAL_APIC
867 disable_apic = 1;
868 #endif
869 setup_clear_cpu_cap(X86_FEATURE_APIC);
870 }
871
872 #ifdef CONFIG_PCI
873 if (pci_early_dump_regs)
874 early_dump_pci_devices();
875 #endif
876
877 finish_e820_parsing();
878
879 if (efi_enabled)
880 efi_init();
881
882 dmi_scan_machine();
883
884 /*
885 * VMware detection requires dmi to be available, so this
886 * needs to be done after dmi_scan_machine, for the BP.
887 */
888 init_hypervisor_platform();
889
890 x86_init.resources.probe_roms();
891
892 /* after parse_early_param, so could debug it */
893 insert_resource(&iomem_resource, &code_resource);
894 insert_resource(&iomem_resource, &data_resource);
895 insert_resource(&iomem_resource, &bss_resource);
896
897 trim_bios_range();
898 #ifdef CONFIG_X86_32
899 if (ppro_with_ram_bug()) {
900 e820_update_range(0x70000000ULL, 0x40000ULL, E820_RAM,
901 E820_RESERVED);
902 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
903 printk(KERN_INFO "fixed physical RAM map:\n");
904 e820_print_map("bad_ppro");
905 }
906 #else
907 early_gart_iommu_check();
908 #endif
909
910 /*
911 * partially used pages are not usable - thus
912 * we are rounding upwards:
913 */
914 max_pfn = e820_end_of_ram_pfn();
915
916 /* update e820 for memory not covered by WB MTRRs */
917 mtrr_bp_init();
918 if (mtrr_trim_uncached_memory(max_pfn))
919 max_pfn = e820_end_of_ram_pfn();
920
921 #ifdef CONFIG_X86_32
922 /* max_low_pfn get updated here */
923 find_low_pfn_range();
924 #else
925 num_physpages = max_pfn;
926
927 check_x2apic();
928
929 /* How many end-of-memory variables you have, grandma! */
930 /* need this before calling reserve_initrd */
931 if (max_pfn > (1UL<<(32 - PAGE_SHIFT)))
932 max_low_pfn = e820_end_of_low_ram_pfn();
933 else
934 max_low_pfn = max_pfn;
935
936 high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
937 #endif
938
939 /*
940 * Find and reserve possible boot-time SMP configuration:
941 */
942 find_smp_config();
943
944 reserve_ibft_region();
945
946 /*
947 * Need to conclude brk, before memblock_x86_fill()
948 * it could use memblock_find_in_range, could overlap with
949 * brk area.
950 */
951 reserve_brk();
952
953 memblock.current_limit = get_max_mapped();
954 memblock_x86_fill();
955
956 /* preallocate 4k for mptable mpc */
957 early_reserve_e820_mpc_new();
958
959 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
960 setup_bios_corruption_check();
961 #endif
962
963 printk(KERN_DEBUG "initial memory mapped : 0 - %08lx\n",
964 max_pfn_mapped<<PAGE_SHIFT);
965
966 setup_trampolines();
967
968 init_gbpages();
969
970 /* max_pfn_mapped is updated here */
971 max_low_pfn_mapped = init_memory_mapping(0, max_low_pfn<<PAGE_SHIFT);
972 max_pfn_mapped = max_low_pfn_mapped;
973
974 #ifdef CONFIG_X86_64
975 if (max_pfn > max_low_pfn) {
976 max_pfn_mapped = init_memory_mapping(1UL<<32,
977 max_pfn<<PAGE_SHIFT);
978 /* can we preseve max_low_pfn ?*/
979 max_low_pfn = max_pfn;
980 }
981 #endif
982 memblock.current_limit = get_max_mapped();
983
984 /*
985 * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
986 */
987
988 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
989 if (init_ohci1394_dma_early)
990 init_ohci1394_dma_on_all_controllers();
991 #endif
992
993 reserve_initrd();
994
995 reserve_crashkernel();
996
997 vsmp_init();
998
999 io_delay_init();
1000
1001 /*
1002 * Parse the ACPI tables for possible boot-time SMP configuration.
1003 */
1004 acpi_boot_table_init();
1005
1006 early_acpi_boot_init();
1007
1008 initmem_init();
1009 memblock_find_dma_reserve();
1010 dma32_reserve_bootmem();
1011
1012 #ifdef CONFIG_KVM_CLOCK
1013 kvmclock_init();
1014 #endif
1015
1016 x86_init.paging.pagetable_setup_start(swapper_pg_dir);
1017 paging_init();
1018 x86_init.paging.pagetable_setup_done(swapper_pg_dir);
1019
1020 #ifdef CONFIG_X86_32
1021 /* sync back kernel address range */
1022 clone_pgd_range(initial_page_table + KERNEL_PGD_BOUNDARY,
1023 swapper_pg_dir + KERNEL_PGD_BOUNDARY,
1024 KERNEL_PGD_PTRS);
1025 #endif
1026
1027 tboot_probe();
1028
1029 #ifdef CONFIG_X86_64
1030 map_vsyscall();
1031 #endif
1032
1033 generic_apic_probe();
1034
1035 early_quirks();
1036
1037 /*
1038 * Read APIC and some other early information from ACPI tables.
1039 */
1040 acpi_boot_init();
1041 sfi_init();
1042 x86_dtb_init();
1043
1044 /*
1045 * get boot-time SMP configuration:
1046 */
1047 if (smp_found_config)
1048 get_smp_config();
1049
1050 prefill_possible_map();
1051
1052 init_cpu_to_node();
1053
1054 init_apic_mappings();
1055 ioapic_and_gsi_init();
1056
1057 kvm_guest_init();
1058
1059 e820_reserve_resources();
1060 e820_mark_nosave_regions(max_low_pfn);
1061
1062 x86_init.resources.reserve_resources();
1063
1064 e820_setup_gap();
1065
1066 #ifdef CONFIG_VT
1067 #if defined(CONFIG_VGA_CONSOLE)
1068 if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
1069 conswitchp = &vga_con;
1070 #elif defined(CONFIG_DUMMY_CONSOLE)
1071 conswitchp = &dummy_con;
1072 #endif
1073 #endif
1074 x86_init.oem.banner();
1075
1076 x86_init.timers.wallclock_init();
1077
1078 mcheck_init();
1079
1080 local_irq_save(flags);
1081 arch_init_ideal_nop5();
1082 local_irq_restore(flags);
1083 }
1084
1085 #ifdef CONFIG_X86_32
1086
1087 static struct resource video_ram_resource = {
1088 .name = "Video RAM area",
1089 .start = 0xa0000,
1090 .end = 0xbffff,
1091 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
1092 };
1093
1094 void __init i386_reserve_resources(void)
1095 {
1096 request_resource(&iomem_resource, &video_ram_resource);
1097 reserve_standard_io_resources();
1098 }
1099
1100 #endif /* CONFIG_X86_32 */
Linux kernel - Deliverables
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