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x86, mm: setup page table in top-down
[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/root_dev.h>
38 #include <linux/highmem.h>
39 #include <linux/module.h>
40 #include <linux/efi.h>
41 #include <linux/init.h>
42 #include <linux/edd.h>
43 #include <linux/iscsi_ibft.h>
44 #include <linux/nodemask.h>
45 #include <linux/kexec.h>
46 #include <linux/dmi.h>
47 #include <linux/pfn.h>
48 #include <linux/pci.h>
49 #include <asm/pci-direct.h>
50 #include <linux/init_ohci1394_dma.h>
51 #include <linux/kvm_para.h>
52 #include <linux/dma-contiguous.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 #include <linux/jiffies.h>
72
73 #include <video/edid.h>
74
75 #include <asm/mtrr.h>
76 #include <asm/apic.h>
77 #include <asm/realmode.h>
78 #include <asm/e820.h>
79 #include <asm/mpspec.h>
80 #include <asm/setup.h>
81 #include <asm/efi.h>
82 #include <asm/timer.h>
83 #include <asm/i8259.h>
84 #include <asm/sections.h>
85 #include <asm/dmi.h>
86 #include <asm/io_apic.h>
87 #include <asm/ist.h>
88 #include <asm/setup_arch.h>
89 #include <asm/bios_ebda.h>
90 #include <asm/cacheflush.h>
91 #include <asm/processor.h>
92 #include <asm/bugs.h>
93
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 * max_low_pfn_mapped: highest direct mapped pfn under 4GB
120 * max_pfn_mapped: highest direct mapped pfn over 4GB
121 *
122 * The direct mapping only covers E820_RAM regions, so the ranges and gaps are
123 * represented by pfn_mapped
124 */
125 unsigned long max_low_pfn_mapped;
126 unsigned long max_pfn_mapped;
127 unsigned long min_pfn_mapped;
128
129 #ifdef CONFIG_DMI
130 RESERVE_BRK(dmi_alloc, 65536);
131 #endif
132
133
134 static __initdata unsigned long _brk_start = (unsigned long)__brk_base;
135 unsigned long _brk_end = (unsigned long)__brk_base;
136
137 #ifdef CONFIG_X86_64
138 int default_cpu_present_to_apicid(int mps_cpu)
139 {
140 return __default_cpu_present_to_apicid(mps_cpu);
141 }
142
143 int default_check_phys_apicid_present(int phys_apicid)
144 {
145 return __default_check_phys_apicid_present(phys_apicid);
146 }
147 #endif
148
149 #ifndef CONFIG_DEBUG_BOOT_PARAMS
150 struct boot_params __initdata boot_params;
151 #else
152 struct boot_params boot_params;
153 #endif
154
155 /*
156 * Machine setup..
157 */
158 static struct resource data_resource = {
159 .name = "Kernel data",
160 .start = 0,
161 .end = 0,
162 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
163 };
164
165 static struct resource code_resource = {
166 .name = "Kernel code",
167 .start = 0,
168 .end = 0,
169 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
170 };
171
172 static struct resource bss_resource = {
173 .name = "Kernel bss",
174 .start = 0,
175 .end = 0,
176 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
177 };
178
179
180 #ifdef CONFIG_X86_32
181 /* cpu data as detected by the assembly code in head.S */
182 struct cpuinfo_x86 new_cpu_data __cpuinitdata = {0, 0, 0, 0, -1, 1, 0, 0, -1};
183 /* common cpu data for all cpus */
184 struct cpuinfo_x86 boot_cpu_data __read_mostly = {0, 0, 0, 0, -1, 1, 0, 0, -1};
185 EXPORT_SYMBOL(boot_cpu_data);
186
187 unsigned int def_to_bigsmp;
188
189 /* for MCA, but anyone else can use it if they want */
190 unsigned int machine_id;
191 unsigned int machine_submodel_id;
192 unsigned int BIOS_revision;
193
194 struct apm_info apm_info;
195 EXPORT_SYMBOL(apm_info);
196
197 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
198 defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
199 struct ist_info ist_info;
200 EXPORT_SYMBOL(ist_info);
201 #else
202 struct ist_info ist_info;
203 #endif
204
205 #else
206 struct cpuinfo_x86 boot_cpu_data __read_mostly = {
207 .x86_phys_bits = MAX_PHYSMEM_BITS,
208 };
209 EXPORT_SYMBOL(boot_cpu_data);
210 #endif
211
212
213 #if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64)
214 unsigned long mmu_cr4_features;
215 #else
216 unsigned long mmu_cr4_features = X86_CR4_PAE;
217 #endif
218
219 /* Boot loader ID and version as integers, for the benefit of proc_dointvec */
220 int bootloader_type, bootloader_version;
221
222 /*
223 * Setup options
224 */
225 struct screen_info screen_info;
226 EXPORT_SYMBOL(screen_info);
227 struct edid_info edid_info;
228 EXPORT_SYMBOL_GPL(edid_info);
229
230 extern int root_mountflags;
231
232 unsigned long saved_video_mode;
233
234 #define RAMDISK_IMAGE_START_MASK 0x07FF
235 #define RAMDISK_PROMPT_FLAG 0x8000
236 #define RAMDISK_LOAD_FLAG 0x4000
237
238 static char __initdata command_line[COMMAND_LINE_SIZE];
239 #ifdef CONFIG_CMDLINE_BOOL
240 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
241 #endif
242
243 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
244 struct edd edd;
245 #ifdef CONFIG_EDD_MODULE
246 EXPORT_SYMBOL(edd);
247 #endif
248 /**
249 * copy_edd() - Copy the BIOS EDD information
250 * from boot_params into a safe place.
251 *
252 */
253 static inline void __init copy_edd(void)
254 {
255 memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer,
256 sizeof(edd.mbr_signature));
257 memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
258 edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
259 edd.edd_info_nr = boot_params.eddbuf_entries;
260 }
261 #else
262 static inline void __init copy_edd(void)
263 {
264 }
265 #endif
266
267 void * __init extend_brk(size_t size, size_t align)
268 {
269 size_t mask = align - 1;
270 void *ret;
271
272 BUG_ON(_brk_start == 0);
273 BUG_ON(align & mask);
274
275 _brk_end = (_brk_end + mask) & ~mask;
276 BUG_ON((char *)(_brk_end + size) > __brk_limit);
277
278 ret = (void *)_brk_end;
279 _brk_end += size;
280
281 memset(ret, 0, size);
282
283 return ret;
284 }
285
286 #ifdef CONFIG_X86_64
287 static void __init init_gbpages(void)
288 {
289 if (direct_gbpages && cpu_has_gbpages)
290 printk(KERN_INFO "Using GB pages for direct mapping\n");
291 else
292 direct_gbpages = 0;
293 }
294 #else
295 static inline void init_gbpages(void)
296 {
297 }
298 static void __init cleanup_highmap(void)
299 {
300 }
301 #endif
302
303 static void __init reserve_brk(void)
304 {
305 if (_brk_end > _brk_start)
306 memblock_reserve(__pa(_brk_start),
307 __pa(_brk_end) - __pa(_brk_start));
308
309 /* Mark brk area as locked down and no longer taking any
310 new allocations */
311 _brk_start = 0;
312 }
313
314 #ifdef CONFIG_BLK_DEV_INITRD
315
316 #define MAX_MAP_CHUNK (NR_FIX_BTMAPS << PAGE_SHIFT)
317 static void __init relocate_initrd(void)
318 {
319 /* Assume only end is not page aligned */
320 u64 ramdisk_image = boot_params.hdr.ramdisk_image;
321 u64 ramdisk_size = boot_params.hdr.ramdisk_size;
322 u64 area_size = PAGE_ALIGN(ramdisk_size);
323 u64 ramdisk_here;
324 unsigned long slop, clen, mapaddr;
325 char *p, *q;
326
327 /* We need to move the initrd down into directly mapped mem */
328 ramdisk_here = memblock_find_in_range(0, PFN_PHYS(max_pfn_mapped),
329 area_size, PAGE_SIZE);
330
331 if (!ramdisk_here)
332 panic("Cannot find place for new RAMDISK of size %lld\n",
333 ramdisk_size);
334
335 /* Note: this includes all the mem currently occupied by
336 the initrd, we rely on that fact to keep the data intact. */
337 memblock_reserve(ramdisk_here, area_size);
338 initrd_start = ramdisk_here + PAGE_OFFSET;
339 initrd_end = initrd_start + ramdisk_size;
340 printk(KERN_INFO "Allocated new RAMDISK: [mem %#010llx-%#010llx]\n",
341 ramdisk_here, ramdisk_here + ramdisk_size - 1);
342
343 q = (char *)initrd_start;
344
345 /* Copy the initrd */
346 while (ramdisk_size) {
347 slop = ramdisk_image & ~PAGE_MASK;
348 clen = ramdisk_size;
349 if (clen > MAX_MAP_CHUNK-slop)
350 clen = MAX_MAP_CHUNK-slop;
351 mapaddr = ramdisk_image & PAGE_MASK;
352 p = early_memremap(mapaddr, clen+slop);
353 memcpy(q, p+slop, clen);
354 early_iounmap(p, clen+slop);
355 q += clen;
356 ramdisk_image += clen;
357 ramdisk_size -= clen;
358 }
359
360 ramdisk_image = boot_params.hdr.ramdisk_image;
361 ramdisk_size = boot_params.hdr.ramdisk_size;
362 printk(KERN_INFO "Move RAMDISK from [mem %#010llx-%#010llx] to"
363 " [mem %#010llx-%#010llx]\n",
364 ramdisk_image, ramdisk_image + ramdisk_size - 1,
365 ramdisk_here, ramdisk_here + ramdisk_size - 1);
366 }
367
368 static u64 __init get_mem_size(unsigned long limit_pfn)
369 {
370 int i;
371 u64 mapped_pages = 0;
372 unsigned long start_pfn, end_pfn;
373
374 for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, NULL) {
375 start_pfn = min_t(unsigned long, start_pfn, limit_pfn);
376 end_pfn = min_t(unsigned long, end_pfn, limit_pfn);
377 mapped_pages += end_pfn - start_pfn;
378 }
379
380 return mapped_pages << PAGE_SHIFT;
381 }
382 static void __init reserve_initrd(void)
383 {
384 /* Assume only end is not page aligned */
385 u64 ramdisk_image = boot_params.hdr.ramdisk_image;
386 u64 ramdisk_size = boot_params.hdr.ramdisk_size;
387 u64 ramdisk_end = PAGE_ALIGN(ramdisk_image + ramdisk_size);
388 u64 mapped_size;
389
390 if (!boot_params.hdr.type_of_loader ||
391 !ramdisk_image || !ramdisk_size)
392 return; /* No initrd provided by bootloader */
393
394 initrd_start = 0;
395
396 mapped_size = get_mem_size(max_pfn_mapped);
397 if (ramdisk_size >= (mapped_size>>1))
398 panic("initrd too large to handle, "
399 "disabling initrd (%lld needed, %lld available)\n",
400 ramdisk_size, mapped_size>>1);
401
402 printk(KERN_INFO "RAMDISK: [mem %#010llx-%#010llx]\n", ramdisk_image,
403 ramdisk_end - 1);
404
405 if (pfn_range_is_mapped(PFN_DOWN(ramdisk_image),
406 PFN_DOWN(ramdisk_end))) {
407 /* All are mapped, easy case */
408 /*
409 * don't need to reserve again, already reserved early
410 * in i386_start_kernel
411 */
412 initrd_start = ramdisk_image + PAGE_OFFSET;
413 initrd_end = initrd_start + ramdisk_size;
414 return;
415 }
416
417 relocate_initrd();
418
419 memblock_free(ramdisk_image, ramdisk_end - ramdisk_image);
420 }
421 #else
422 static void __init reserve_initrd(void)
423 {
424 }
425 #endif /* CONFIG_BLK_DEV_INITRD */
426
427 static void __init parse_setup_data(void)
428 {
429 struct setup_data *data;
430 u64 pa_data;
431
432 if (boot_params.hdr.version < 0x0209)
433 return;
434 pa_data = boot_params.hdr.setup_data;
435 while (pa_data) {
436 u32 data_len, map_len;
437
438 map_len = max(PAGE_SIZE - (pa_data & ~PAGE_MASK),
439 (u64)sizeof(struct setup_data));
440 data = early_memremap(pa_data, map_len);
441 data_len = data->len + sizeof(struct setup_data);
442 if (data_len > map_len) {
443 early_iounmap(data, map_len);
444 data = early_memremap(pa_data, data_len);
445 map_len = data_len;
446 }
447
448 switch (data->type) {
449 case SETUP_E820_EXT:
450 parse_e820_ext(data);
451 break;
452 case SETUP_DTB:
453 add_dtb(pa_data);
454 break;
455 default:
456 break;
457 }
458 pa_data = data->next;
459 early_iounmap(data, map_len);
460 }
461 }
462
463 static void __init e820_reserve_setup_data(void)
464 {
465 struct setup_data *data;
466 u64 pa_data;
467 int found = 0;
468
469 if (boot_params.hdr.version < 0x0209)
470 return;
471 pa_data = boot_params.hdr.setup_data;
472 while (pa_data) {
473 data = early_memremap(pa_data, sizeof(*data));
474 e820_update_range(pa_data, sizeof(*data)+data->len,
475 E820_RAM, E820_RESERVED_KERN);
476 found = 1;
477 pa_data = data->next;
478 early_iounmap(data, sizeof(*data));
479 }
480 if (!found)
481 return;
482
483 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
484 memcpy(&e820_saved, &e820, sizeof(struct e820map));
485 printk(KERN_INFO "extended physical RAM map:\n");
486 e820_print_map("reserve setup_data");
487 }
488
489 static void __init memblock_x86_reserve_range_setup_data(void)
490 {
491 struct setup_data *data;
492 u64 pa_data;
493
494 if (boot_params.hdr.version < 0x0209)
495 return;
496 pa_data = boot_params.hdr.setup_data;
497 while (pa_data) {
498 data = early_memremap(pa_data, sizeof(*data));
499 memblock_reserve(pa_data, sizeof(*data) + data->len);
500 pa_data = data->next;
501 early_iounmap(data, sizeof(*data));
502 }
503 }
504
505 /*
506 * --------- Crashkernel reservation ------------------------------
507 */
508
509 #ifdef CONFIG_KEXEC
510
511 /*
512 * Keep the crash kernel below this limit. On 32 bits earlier kernels
513 * would limit the kernel to the low 512 MiB due to mapping restrictions.
514 * On 64 bits, kexec-tools currently limits us to 896 MiB; increase this
515 * limit once kexec-tools are fixed.
516 */
517 #ifdef CONFIG_X86_32
518 # define CRASH_KERNEL_ADDR_MAX (512 << 20)
519 #else
520 # define CRASH_KERNEL_ADDR_MAX (896 << 20)
521 #endif
522
523 static void __init reserve_crashkernel(void)
524 {
525 unsigned long long total_mem;
526 unsigned long long crash_size, crash_base;
527 int ret;
528
529 total_mem = memblock_phys_mem_size();
530
531 ret = parse_crashkernel(boot_command_line, total_mem,
532 &crash_size, &crash_base);
533 if (ret != 0 || crash_size <= 0)
534 return;
535
536 /* 0 means: find the address automatically */
537 if (crash_base <= 0) {
538 const unsigned long long alignment = 16<<20; /* 16M */
539
540 /*
541 * kexec want bzImage is below CRASH_KERNEL_ADDR_MAX
542 */
543 crash_base = memblock_find_in_range(alignment,
544 CRASH_KERNEL_ADDR_MAX, crash_size, alignment);
545
546 if (!crash_base) {
547 pr_info("crashkernel reservation failed - No suitable area found.\n");
548 return;
549 }
550 } else {
551 unsigned long long start;
552
553 start = memblock_find_in_range(crash_base,
554 crash_base + crash_size, crash_size, 1<<20);
555 if (start != crash_base) {
556 pr_info("crashkernel reservation failed - memory is in use.\n");
557 return;
558 }
559 }
560 memblock_reserve(crash_base, crash_size);
561
562 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
563 "for crashkernel (System RAM: %ldMB)\n",
564 (unsigned long)(crash_size >> 20),
565 (unsigned long)(crash_base >> 20),
566 (unsigned long)(total_mem >> 20));
567
568 crashk_res.start = crash_base;
569 crashk_res.end = crash_base + crash_size - 1;
570 insert_resource(&iomem_resource, &crashk_res);
571 }
572 #else
573 static void __init reserve_crashkernel(void)
574 {
575 }
576 #endif
577
578 static struct resource standard_io_resources[] = {
579 { .name = "dma1", .start = 0x00, .end = 0x1f,
580 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
581 { .name = "pic1", .start = 0x20, .end = 0x21,
582 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
583 { .name = "timer0", .start = 0x40, .end = 0x43,
584 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
585 { .name = "timer1", .start = 0x50, .end = 0x53,
586 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
587 { .name = "keyboard", .start = 0x60, .end = 0x60,
588 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
589 { .name = "keyboard", .start = 0x64, .end = 0x64,
590 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
591 { .name = "dma page reg", .start = 0x80, .end = 0x8f,
592 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
593 { .name = "pic2", .start = 0xa0, .end = 0xa1,
594 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
595 { .name = "dma2", .start = 0xc0, .end = 0xdf,
596 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
597 { .name = "fpu", .start = 0xf0, .end = 0xff,
598 .flags = IORESOURCE_BUSY | IORESOURCE_IO }
599 };
600
601 void __init reserve_standard_io_resources(void)
602 {
603 int i;
604
605 /* request I/O space for devices used on all i[345]86 PCs */
606 for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
607 request_resource(&ioport_resource, &standard_io_resources[i]);
608
609 }
610
611 static __init void reserve_ibft_region(void)
612 {
613 unsigned long addr, size = 0;
614
615 addr = find_ibft_region(&size);
616
617 if (size)
618 memblock_reserve(addr, size);
619 }
620
621 static unsigned reserve_low = CONFIG_X86_RESERVE_LOW << 10;
622
623 static void __init trim_bios_range(void)
624 {
625 /*
626 * A special case is the first 4Kb of memory;
627 * This is a BIOS owned area, not kernel ram, but generally
628 * not listed as such in the E820 table.
629 *
630 * This typically reserves additional memory (64KiB by default)
631 * since some BIOSes are known to corrupt low memory. See the
632 * Kconfig help text for X86_RESERVE_LOW.
633 */
634 e820_update_range(0, ALIGN(reserve_low, PAGE_SIZE),
635 E820_RAM, E820_RESERVED);
636
637 /*
638 * special case: Some BIOSen report the PC BIOS
639 * area (640->1Mb) as ram even though it is not.
640 * take them out.
641 */
642 e820_remove_range(BIOS_BEGIN, BIOS_END - BIOS_BEGIN, E820_RAM, 1);
643 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
644 }
645
646 static int __init parse_reservelow(char *p)
647 {
648 unsigned long long size;
649
650 if (!p)
651 return -EINVAL;
652
653 size = memparse(p, &p);
654
655 if (size < 4096)
656 size = 4096;
657
658 if (size > 640*1024)
659 size = 640*1024;
660
661 reserve_low = size;
662
663 return 0;
664 }
665
666 early_param("reservelow", parse_reservelow);
667
668 /*
669 * Determine if we were loaded by an EFI loader. If so, then we have also been
670 * passed the efi memmap, systab, etc., so we should use these data structures
671 * for initialization. Note, the efi init code path is determined by the
672 * global efi_enabled. This allows the same kernel image to be used on existing
673 * systems (with a traditional BIOS) as well as on EFI systems.
674 */
675 /*
676 * setup_arch - architecture-specific boot-time initializations
677 *
678 * Note: On x86_64, fixmaps are ready for use even before this is called.
679 */
680
681 void __init setup_arch(char **cmdline_p)
682 {
683 #ifdef CONFIG_X86_32
684 memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
685 visws_early_detect();
686
687 /*
688 * copy kernel address range established so far and switch
689 * to the proper swapper page table
690 */
691 clone_pgd_range(swapper_pg_dir + KERNEL_PGD_BOUNDARY,
692 initial_page_table + KERNEL_PGD_BOUNDARY,
693 KERNEL_PGD_PTRS);
694
695 load_cr3(swapper_pg_dir);
696 __flush_tlb_all();
697 #else
698 printk(KERN_INFO "Command line: %s\n", boot_command_line);
699 #endif
700
701 /*
702 * If we have OLPC OFW, we might end up relocating the fixmap due to
703 * reserve_top(), so do this before touching the ioremap area.
704 */
705 olpc_ofw_detect();
706
707 early_trap_init();
708 early_cpu_init();
709 early_ioremap_init();
710
711 setup_olpc_ofw_pgd();
712
713 ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
714 screen_info = boot_params.screen_info;
715 edid_info = boot_params.edid_info;
716 #ifdef CONFIG_X86_32
717 apm_info.bios = boot_params.apm_bios_info;
718 ist_info = boot_params.ist_info;
719 if (boot_params.sys_desc_table.length != 0) {
720 machine_id = boot_params.sys_desc_table.table[0];
721 machine_submodel_id = boot_params.sys_desc_table.table[1];
722 BIOS_revision = boot_params.sys_desc_table.table[2];
723 }
724 #endif
725 saved_video_mode = boot_params.hdr.vid_mode;
726 bootloader_type = boot_params.hdr.type_of_loader;
727 if ((bootloader_type >> 4) == 0xe) {
728 bootloader_type &= 0xf;
729 bootloader_type |= (boot_params.hdr.ext_loader_type+0x10) << 4;
730 }
731 bootloader_version = bootloader_type & 0xf;
732 bootloader_version |= boot_params.hdr.ext_loader_ver << 4;
733
734 #ifdef CONFIG_BLK_DEV_RAM
735 rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
736 rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
737 rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
738 #endif
739 #ifdef CONFIG_EFI
740 if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
741 "EL32", 4)) {
742 efi_enabled = 1;
743 efi_64bit = false;
744 } else if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
745 "EL64", 4)) {
746 efi_enabled = 1;
747 efi_64bit = true;
748 }
749 if (efi_enabled && efi_memblock_x86_reserve_range())
750 efi_enabled = 0;
751 #endif
752
753 x86_init.oem.arch_setup();
754
755 iomem_resource.end = (1ULL << boot_cpu_data.x86_phys_bits) - 1;
756 setup_memory_map();
757 parse_setup_data();
758 /* update the e820_saved too */
759 e820_reserve_setup_data();
760
761 copy_edd();
762
763 if (!boot_params.hdr.root_flags)
764 root_mountflags &= ~MS_RDONLY;
765 init_mm.start_code = (unsigned long) _text;
766 init_mm.end_code = (unsigned long) _etext;
767 init_mm.end_data = (unsigned long) _edata;
768 init_mm.brk = _brk_end;
769
770 code_resource.start = virt_to_phys(_text);
771 code_resource.end = virt_to_phys(_etext)-1;
772 data_resource.start = virt_to_phys(_etext);
773 data_resource.end = virt_to_phys(_edata)-1;
774 bss_resource.start = virt_to_phys(&__bss_start);
775 bss_resource.end = virt_to_phys(&__bss_stop)-1;
776
777 #ifdef CONFIG_CMDLINE_BOOL
778 #ifdef CONFIG_CMDLINE_OVERRIDE
779 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
780 #else
781 if (builtin_cmdline[0]) {
782 /* append boot loader cmdline to builtin */
783 strlcat(builtin_cmdline, " ", COMMAND_LINE_SIZE);
784 strlcat(builtin_cmdline, boot_command_line, COMMAND_LINE_SIZE);
785 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
786 }
787 #endif
788 #endif
789
790 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
791 *cmdline_p = command_line;
792
793 /*
794 * x86_configure_nx() is called before parse_early_param() to detect
795 * whether hardware doesn't support NX (so that the early EHCI debug
796 * console setup can safely call set_fixmap()). It may then be called
797 * again from within noexec_setup() during parsing early parameters
798 * to honor the respective command line option.
799 */
800 x86_configure_nx();
801
802 parse_early_param();
803
804 x86_report_nx();
805
806 /* after early param, so could get panic from serial */
807 memblock_x86_reserve_range_setup_data();
808
809 if (acpi_mps_check()) {
810 #ifdef CONFIG_X86_LOCAL_APIC
811 disable_apic = 1;
812 #endif
813 setup_clear_cpu_cap(X86_FEATURE_APIC);
814 }
815
816 #ifdef CONFIG_PCI
817 if (pci_early_dump_regs)
818 early_dump_pci_devices();
819 #endif
820
821 finish_e820_parsing();
822
823 if (efi_enabled)
824 efi_init();
825
826 dmi_scan_machine();
827
828 /*
829 * VMware detection requires dmi to be available, so this
830 * needs to be done after dmi_scan_machine, for the BP.
831 */
832 init_hypervisor_platform();
833
834 x86_init.resources.probe_roms();
835
836 /* after parse_early_param, so could debug it */
837 insert_resource(&iomem_resource, &code_resource);
838 insert_resource(&iomem_resource, &data_resource);
839 insert_resource(&iomem_resource, &bss_resource);
840
841 /*
842 * Complain if .text .data and .bss are not marked as E820_RAM and
843 * attempt to fix it by adding the range. We may have a confused BIOS,
844 * or the user may have incorrectly supplied it via memmap=exactmap. If
845 * we really are running on top non-RAM, we will crash later anyways.
846 */
847 if (!e820_all_mapped(code_resource.start, __pa(__brk_limit), E820_RAM)) {
848 pr_warn(".text .data .bss are not marked as E820_RAM!\n");
849
850 e820_add_region(code_resource.start,
851 __pa(__brk_limit) - code_resource.start + 1,
852 E820_RAM);
853 }
854
855 trim_bios_range();
856 #ifdef CONFIG_X86_32
857 if (ppro_with_ram_bug()) {
858 e820_update_range(0x70000000ULL, 0x40000ULL, E820_RAM,
859 E820_RESERVED);
860 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
861 printk(KERN_INFO "fixed physical RAM map:\n");
862 e820_print_map("bad_ppro");
863 }
864 #else
865 early_gart_iommu_check();
866 #endif
867
868 /*
869 * partially used pages are not usable - thus
870 * we are rounding upwards:
871 */
872 max_pfn = e820_end_of_ram_pfn();
873
874 /* update e820 for memory not covered by WB MTRRs */
875 mtrr_bp_init();
876 if (mtrr_trim_uncached_memory(max_pfn))
877 max_pfn = e820_end_of_ram_pfn();
878
879 #ifdef CONFIG_X86_32
880 /* max_low_pfn get updated here */
881 find_low_pfn_range();
882 #else
883 num_physpages = max_pfn;
884
885 check_x2apic();
886
887 /* How many end-of-memory variables you have, grandma! */
888 /* need this before calling reserve_initrd */
889 if (max_pfn > (1UL<<(32 - PAGE_SHIFT)))
890 max_low_pfn = e820_end_of_low_ram_pfn();
891 else
892 max_low_pfn = max_pfn;
893
894 high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
895 #endif
896
897 /*
898 * Find and reserve possible boot-time SMP configuration:
899 */
900 find_smp_config();
901
902 reserve_ibft_region();
903
904 early_alloc_pgt_buf();
905
906 /*
907 * Need to conclude brk, before memblock_x86_fill()
908 * it could use memblock_find_in_range, could overlap with
909 * brk area.
910 */
911 reserve_brk();
912
913 cleanup_highmap();
914
915 memblock.current_limit = ISA_END_ADDRESS;
916 memblock_x86_fill();
917
918 /*
919 * The EFI specification says that boot service code won't be called
920 * after ExitBootServices(). This is, in fact, a lie.
921 */
922 if (efi_enabled)
923 efi_reserve_boot_services();
924
925 /* preallocate 4k for mptable mpc */
926 early_reserve_e820_mpc_new();
927
928 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
929 setup_bios_corruption_check();
930 #endif
931
932 printk(KERN_DEBUG "initial memory mapped: [mem 0x00000000-%#010lx]\n",
933 (max_pfn_mapped<<PAGE_SHIFT) - 1);
934
935 setup_real_mode();
936
937 init_gbpages();
938
939 init_mem_mapping();
940
941 memblock.current_limit = get_max_mapped();
942 dma_contiguous_reserve(0);
943
944 /*
945 * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
946 */
947
948 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
949 if (init_ohci1394_dma_early)
950 init_ohci1394_dma_on_all_controllers();
951 #endif
952 /* Allocate bigger log buffer */
953 setup_log_buf(1);
954
955 reserve_initrd();
956
957 reserve_crashkernel();
958
959 vsmp_init();
960
961 io_delay_init();
962
963 /*
964 * Parse the ACPI tables for possible boot-time SMP configuration.
965 */
966 acpi_boot_table_init();
967
968 early_acpi_boot_init();
969
970 initmem_init();
971 memblock_find_dma_reserve();
972
973 #ifdef CONFIG_KVM_GUEST
974 kvmclock_init();
975 #endif
976
977 x86_init.paging.pagetable_init();
978
979 if (boot_cpu_data.cpuid_level >= 0) {
980 /* A CPU has %cr4 if and only if it has CPUID */
981 mmu_cr4_features = read_cr4();
982 if (trampoline_cr4_features)
983 *trampoline_cr4_features = mmu_cr4_features;
984 }
985
986 #ifdef CONFIG_X86_32
987 /* sync back kernel address range */
988 clone_pgd_range(initial_page_table + KERNEL_PGD_BOUNDARY,
989 swapper_pg_dir + KERNEL_PGD_BOUNDARY,
990 KERNEL_PGD_PTRS);
991 #endif
992
993 tboot_probe();
994
995 #ifdef CONFIG_X86_64
996 map_vsyscall();
997 #endif
998
999 generic_apic_probe();
1000
1001 early_quirks();
1002
1003 /*
1004 * Read APIC and some other early information from ACPI tables.
1005 */
1006 acpi_boot_init();
1007 sfi_init();
1008 x86_dtb_init();
1009
1010 /*
1011 * get boot-time SMP configuration:
1012 */
1013 if (smp_found_config)
1014 get_smp_config();
1015
1016 prefill_possible_map();
1017
1018 init_cpu_to_node();
1019
1020 init_apic_mappings();
1021 if (x86_io_apic_ops.init)
1022 x86_io_apic_ops.init();
1023
1024 kvm_guest_init();
1025
1026 e820_reserve_resources();
1027 e820_mark_nosave_regions(max_low_pfn);
1028
1029 x86_init.resources.reserve_resources();
1030
1031 e820_setup_gap();
1032
1033 #ifdef CONFIG_VT
1034 #if defined(CONFIG_VGA_CONSOLE)
1035 if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
1036 conswitchp = &vga_con;
1037 #elif defined(CONFIG_DUMMY_CONSOLE)
1038 conswitchp = &dummy_con;
1039 #endif
1040 #endif
1041 x86_init.oem.banner();
1042
1043 x86_init.timers.wallclock_init();
1044
1045 mcheck_init();
1046
1047 arch_init_ideal_nops();
1048
1049 register_refined_jiffies(CLOCK_TICK_RATE);
1050
1051 #ifdef CONFIG_EFI
1052 /* Once setup is done above, disable efi_enabled on mismatched
1053 * firmware/kernel archtectures since there is no support for
1054 * runtime services.
1055 */
1056 if (efi_enabled && IS_ENABLED(CONFIG_X86_64) != efi_64bit) {
1057 pr_info("efi: Setup done, disabling due to 32/64-bit mismatch\n");
1058 efi_unmap_memmap();
1059 efi_enabled = 0;
1060 }
1061 #endif
1062 }
1063
1064 #ifdef CONFIG_X86_32
1065
1066 static struct resource video_ram_resource = {
1067 .name = "Video RAM area",
1068 .start = 0xa0000,
1069 .end = 0xbffff,
1070 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
1071 };
1072
1073 void __init i386_reserve_resources(void)
1074 {
1075 request_resource(&iomem_resource, &video_ram_resource);
1076 reserve_standard_io_resources();
1077 }
1078
1079 #endif /* CONFIG_X86_32 */
Linux kernel - Deliverables
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