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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/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 #include <asm/kasan.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 #include <asm/mce.h>
112 #include <asm/alternative.h>
113 #include <asm/prom.h>
114
115 /*
116 * max_low_pfn_mapped: highest direct mapped pfn under 4GB
117 * max_pfn_mapped: highest direct mapped pfn over 4GB
118 *
119 * The direct mapping only covers E820_RAM regions, so the ranges and gaps are
120 * represented by pfn_mapped
121 */
122 unsigned long max_low_pfn_mapped;
123 unsigned long max_pfn_mapped;
124
125 bool __read_mostly kaslr_enabled = false;
126
127 #ifdef CONFIG_DMI
128 RESERVE_BRK(dmi_alloc, 65536);
129 #endif
130
131
132 static __initdata unsigned long _brk_start = (unsigned long)__brk_base;
133 unsigned long _brk_end = (unsigned long)__brk_base;
134
135 #ifdef CONFIG_X86_64
136 int default_cpu_present_to_apicid(int mps_cpu)
137 {
138 return __default_cpu_present_to_apicid(mps_cpu);
139 }
140
141 int default_check_phys_apicid_present(int phys_apicid)
142 {
143 return __default_check_phys_apicid_present(phys_apicid);
144 }
145 #endif
146
147 struct boot_params boot_params;
148
149 /*
150 * Machine setup..
151 */
152 static struct resource data_resource = {
153 .name = "Kernel data",
154 .start = 0,
155 .end = 0,
156 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
157 };
158
159 static struct resource code_resource = {
160 .name = "Kernel code",
161 .start = 0,
162 .end = 0,
163 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
164 };
165
166 static struct resource bss_resource = {
167 .name = "Kernel bss",
168 .start = 0,
169 .end = 0,
170 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
171 };
172
173
174 #ifdef CONFIG_X86_32
175 /* cpu data as detected by the assembly code in head.S */
176 struct cpuinfo_x86 new_cpu_data = {
177 .wp_works_ok = -1,
178 };
179 /* common cpu data for all cpus */
180 struct cpuinfo_x86 boot_cpu_data __read_mostly = {
181 .wp_works_ok = -1,
182 };
183 EXPORT_SYMBOL(boot_cpu_data);
184
185 unsigned int def_to_bigsmp;
186
187 /* for MCA, but anyone else can use it if they want */
188 unsigned int machine_id;
189 unsigned int machine_submodel_id;
190 unsigned int BIOS_revision;
191
192 struct apm_info apm_info;
193 EXPORT_SYMBOL(apm_info);
194
195 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
196 defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
197 struct ist_info ist_info;
198 EXPORT_SYMBOL(ist_info);
199 #else
200 struct ist_info ist_info;
201 #endif
202
203 #else
204 struct cpuinfo_x86 boot_cpu_data __read_mostly = {
205 .x86_phys_bits = MAX_PHYSMEM_BITS,
206 };
207 EXPORT_SYMBOL(boot_cpu_data);
208 #endif
209
210
211 #if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64)
212 __visible unsigned long mmu_cr4_features;
213 #else
214 __visible unsigned long mmu_cr4_features = X86_CR4_PAE;
215 #endif
216
217 /* Boot loader ID and version as integers, for the benefit of proc_dointvec */
218 int bootloader_type, bootloader_version;
219
220 /*
221 * Setup options
222 */
223 struct screen_info screen_info;
224 EXPORT_SYMBOL(screen_info);
225 struct edid_info edid_info;
226 EXPORT_SYMBOL_GPL(edid_info);
227
228 extern int root_mountflags;
229
230 unsigned long saved_video_mode;
231
232 #define RAMDISK_IMAGE_START_MASK 0x07FF
233 #define RAMDISK_PROMPT_FLAG 0x8000
234 #define RAMDISK_LOAD_FLAG 0x4000
235
236 static char __initdata command_line[COMMAND_LINE_SIZE];
237 #ifdef CONFIG_CMDLINE_BOOL
238 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
239 #endif
240
241 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
242 struct edd edd;
243 #ifdef CONFIG_EDD_MODULE
244 EXPORT_SYMBOL(edd);
245 #endif
246 /**
247 * copy_edd() - Copy the BIOS EDD information
248 * from boot_params into a safe place.
249 *
250 */
251 static inline void __init copy_edd(void)
252 {
253 memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer,
254 sizeof(edd.mbr_signature));
255 memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
256 edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
257 edd.edd_info_nr = boot_params.eddbuf_entries;
258 }
259 #else
260 static inline void __init copy_edd(void)
261 {
262 }
263 #endif
264
265 void * __init extend_brk(size_t size, size_t align)
266 {
267 size_t mask = align - 1;
268 void *ret;
269
270 BUG_ON(_brk_start == 0);
271 BUG_ON(align & mask);
272
273 _brk_end = (_brk_end + mask) & ~mask;
274 BUG_ON((char *)(_brk_end + size) > __brk_limit);
275
276 ret = (void *)_brk_end;
277 _brk_end += size;
278
279 memset(ret, 0, size);
280
281 return ret;
282 }
283
284 #ifdef CONFIG_X86_32
285 static void __init cleanup_highmap(void)
286 {
287 }
288 #endif
289
290 static void __init reserve_brk(void)
291 {
292 if (_brk_end > _brk_start)
293 memblock_reserve(__pa_symbol(_brk_start),
294 _brk_end - _brk_start);
295
296 /* Mark brk area as locked down and no longer taking any
297 new allocations */
298 _brk_start = 0;
299 }
300
301 u64 relocated_ramdisk;
302
303 #ifdef CONFIG_BLK_DEV_INITRD
304
305 static u64 __init get_ramdisk_image(void)
306 {
307 u64 ramdisk_image = boot_params.hdr.ramdisk_image;
308
309 ramdisk_image |= (u64)boot_params.ext_ramdisk_image << 32;
310
311 return ramdisk_image;
312 }
313 static u64 __init get_ramdisk_size(void)
314 {
315 u64 ramdisk_size = boot_params.hdr.ramdisk_size;
316
317 ramdisk_size |= (u64)boot_params.ext_ramdisk_size << 32;
318
319 return ramdisk_size;
320 }
321
322 #define MAX_MAP_CHUNK (NR_FIX_BTMAPS << PAGE_SHIFT)
323 static void __init relocate_initrd(void)
324 {
325 /* Assume only end is not page aligned */
326 u64 ramdisk_image = get_ramdisk_image();
327 u64 ramdisk_size = get_ramdisk_size();
328 u64 area_size = PAGE_ALIGN(ramdisk_size);
329 unsigned long slop, clen, mapaddr;
330 char *p, *q;
331
332 /* We need to move the initrd down into directly mapped mem */
333 relocated_ramdisk = memblock_find_in_range(0, PFN_PHYS(max_pfn_mapped),
334 area_size, PAGE_SIZE);
335
336 if (!relocated_ramdisk)
337 panic("Cannot find place for new RAMDISK of size %lld\n",
338 ramdisk_size);
339
340 /* Note: this includes all the mem currently occupied by
341 the initrd, we rely on that fact to keep the data intact. */
342 memblock_reserve(relocated_ramdisk, area_size);
343 initrd_start = relocated_ramdisk + PAGE_OFFSET;
344 initrd_end = initrd_start + ramdisk_size;
345 printk(KERN_INFO "Allocated new RAMDISK: [mem %#010llx-%#010llx]\n",
346 relocated_ramdisk, relocated_ramdisk + ramdisk_size - 1);
347
348 q = (char *)initrd_start;
349
350 /* Copy the initrd */
351 while (ramdisk_size) {
352 slop = ramdisk_image & ~PAGE_MASK;
353 clen = ramdisk_size;
354 if (clen > MAX_MAP_CHUNK-slop)
355 clen = MAX_MAP_CHUNK-slop;
356 mapaddr = ramdisk_image & PAGE_MASK;
357 p = early_memremap(mapaddr, clen+slop);
358 memcpy(q, p+slop, clen);
359 early_iounmap(p, clen+slop);
360 q += clen;
361 ramdisk_image += clen;
362 ramdisk_size -= clen;
363 }
364
365 ramdisk_image = get_ramdisk_image();
366 ramdisk_size = get_ramdisk_size();
367 printk(KERN_INFO "Move RAMDISK from [mem %#010llx-%#010llx] to"
368 " [mem %#010llx-%#010llx]\n",
369 ramdisk_image, ramdisk_image + ramdisk_size - 1,
370 relocated_ramdisk, relocated_ramdisk + ramdisk_size - 1);
371 }
372
373 static void __init early_reserve_initrd(void)
374 {
375 /* Assume only end is not page aligned */
376 u64 ramdisk_image = get_ramdisk_image();
377 u64 ramdisk_size = get_ramdisk_size();
378 u64 ramdisk_end = PAGE_ALIGN(ramdisk_image + ramdisk_size);
379
380 if (!boot_params.hdr.type_of_loader ||
381 !ramdisk_image || !ramdisk_size)
382 return; /* No initrd provided by bootloader */
383
384 memblock_reserve(ramdisk_image, ramdisk_end - ramdisk_image);
385 }
386 static void __init reserve_initrd(void)
387 {
388 /* Assume only end is not page aligned */
389 u64 ramdisk_image = get_ramdisk_image();
390 u64 ramdisk_size = get_ramdisk_size();
391 u64 ramdisk_end = PAGE_ALIGN(ramdisk_image + ramdisk_size);
392 u64 mapped_size;
393
394 if (!boot_params.hdr.type_of_loader ||
395 !ramdisk_image || !ramdisk_size)
396 return; /* No initrd provided by bootloader */
397
398 initrd_start = 0;
399
400 mapped_size = memblock_mem_size(max_pfn_mapped);
401 if (ramdisk_size >= (mapped_size>>1))
402 panic("initrd too large to handle, "
403 "disabling initrd (%lld needed, %lld available)\n",
404 ramdisk_size, mapped_size>>1);
405
406 printk(KERN_INFO "RAMDISK: [mem %#010llx-%#010llx]\n", ramdisk_image,
407 ramdisk_end - 1);
408
409 if (pfn_range_is_mapped(PFN_DOWN(ramdisk_image),
410 PFN_DOWN(ramdisk_end))) {
411 /* All are mapped, easy case */
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 early_reserve_initrd(void)
423 {
424 }
425 static void __init reserve_initrd(void)
426 {
427 }
428 #endif /* CONFIG_BLK_DEV_INITRD */
429
430 static void __init parse_kaslr_setup(u64 pa_data, u32 data_len)
431 {
432 kaslr_enabled = (bool)(pa_data + sizeof(struct setup_data));
433 }
434
435 static void __init parse_setup_data(void)
436 {
437 struct setup_data *data;
438 u64 pa_data, pa_next;
439
440 pa_data = boot_params.hdr.setup_data;
441 while (pa_data) {
442 u32 data_len, data_type;
443
444 data = early_memremap(pa_data, sizeof(*data));
445 data_len = data->len + sizeof(struct setup_data);
446 data_type = data->type;
447 pa_next = data->next;
448 early_iounmap(data, sizeof(*data));
449
450 switch (data_type) {
451 case SETUP_E820_EXT:
452 parse_e820_ext(pa_data, data_len);
453 break;
454 case SETUP_DTB:
455 add_dtb(pa_data);
456 break;
457 case SETUP_EFI:
458 parse_efi_setup(pa_data, data_len);
459 break;
460 case SETUP_KASLR:
461 parse_kaslr_setup(pa_data, data_len);
462 break;
463 default:
464 break;
465 }
466 pa_data = pa_next;
467 }
468 }
469
470 static void __init e820_reserve_setup_data(void)
471 {
472 struct setup_data *data;
473 u64 pa_data;
474 int found = 0;
475
476 pa_data = boot_params.hdr.setup_data;
477 while (pa_data) {
478 data = early_memremap(pa_data, sizeof(*data));
479 e820_update_range(pa_data, sizeof(*data)+data->len,
480 E820_RAM, E820_RESERVED_KERN);
481 found = 1;
482 pa_data = data->next;
483 early_iounmap(data, sizeof(*data));
484 }
485 if (!found)
486 return;
487
488 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
489 memcpy(&e820_saved, &e820, sizeof(struct e820map));
490 printk(KERN_INFO "extended physical RAM map:\n");
491 e820_print_map("reserve setup_data");
492 }
493
494 static void __init memblock_x86_reserve_range_setup_data(void)
495 {
496 struct setup_data *data;
497 u64 pa_data;
498
499 pa_data = boot_params.hdr.setup_data;
500 while (pa_data) {
501 data = early_memremap(pa_data, sizeof(*data));
502 memblock_reserve(pa_data, sizeof(*data) + data->len);
503 pa_data = data->next;
504 early_iounmap(data, sizeof(*data));
505 }
506 }
507
508 /*
509 * --------- Crashkernel reservation ------------------------------
510 */
511
512 #ifdef CONFIG_KEXEC
513
514 /*
515 * Keep the crash kernel below this limit. On 32 bits earlier kernels
516 * would limit the kernel to the low 512 MiB due to mapping restrictions.
517 * On 64bit, old kexec-tools need to under 896MiB.
518 */
519 #ifdef CONFIG_X86_32
520 # define CRASH_KERNEL_ADDR_LOW_MAX (512 << 20)
521 # define CRASH_KERNEL_ADDR_HIGH_MAX (512 << 20)
522 #else
523 # define CRASH_KERNEL_ADDR_LOW_MAX (896UL<<20)
524 # define CRASH_KERNEL_ADDR_HIGH_MAX MAXMEM
525 #endif
526
527 static void __init reserve_crashkernel_low(void)
528 {
529 #ifdef CONFIG_X86_64
530 const unsigned long long alignment = 16<<20; /* 16M */
531 unsigned long long low_base = 0, low_size = 0;
532 unsigned long total_low_mem;
533 unsigned long long base;
534 bool auto_set = false;
535 int ret;
536
537 total_low_mem = memblock_mem_size(1UL<<(32-PAGE_SHIFT));
538 /* crashkernel=Y,low */
539 ret = parse_crashkernel_low(boot_command_line, total_low_mem,
540 &low_size, &base);
541 if (ret != 0) {
542 /*
543 * two parts from lib/swiotlb.c:
544 * swiotlb size: user specified with swiotlb= or default.
545 * swiotlb overflow buffer: now is hardcoded to 32k.
546 * We round it to 8M for other buffers that
547 * may need to stay low too.
548 */
549 low_size = swiotlb_size_or_default() + (8UL<<20);
550 auto_set = true;
551 } else {
552 /* passed with crashkernel=0,low ? */
553 if (!low_size)
554 return;
555 }
556
557 low_base = memblock_find_in_range(low_size, (1ULL<<32),
558 low_size, alignment);
559
560 if (!low_base) {
561 if (!auto_set)
562 pr_info("crashkernel low reservation failed - No suitable area found.\n");
563
564 return;
565 }
566
567 memblock_reserve(low_base, low_size);
568 pr_info("Reserving %ldMB of low memory at %ldMB for crashkernel (System low RAM: %ldMB)\n",
569 (unsigned long)(low_size >> 20),
570 (unsigned long)(low_base >> 20),
571 (unsigned long)(total_low_mem >> 20));
572 crashk_low_res.start = low_base;
573 crashk_low_res.end = low_base + low_size - 1;
574 insert_resource(&iomem_resource, &crashk_low_res);
575 #endif
576 }
577
578 static void __init reserve_crashkernel(void)
579 {
580 const unsigned long long alignment = 16<<20; /* 16M */
581 unsigned long long total_mem;
582 unsigned long long crash_size, crash_base;
583 bool high = false;
584 int ret;
585
586 total_mem = memblock_phys_mem_size();
587
588 /* crashkernel=XM */
589 ret = parse_crashkernel(boot_command_line, total_mem,
590 &crash_size, &crash_base);
591 if (ret != 0 || crash_size <= 0) {
592 /* crashkernel=X,high */
593 ret = parse_crashkernel_high(boot_command_line, total_mem,
594 &crash_size, &crash_base);
595 if (ret != 0 || crash_size <= 0)
596 return;
597 high = true;
598 }
599
600 /* 0 means: find the address automatically */
601 if (crash_base <= 0) {
602 /*
603 * kexec want bzImage is below CRASH_KERNEL_ADDR_MAX
604 */
605 crash_base = memblock_find_in_range(alignment,
606 high ? CRASH_KERNEL_ADDR_HIGH_MAX :
607 CRASH_KERNEL_ADDR_LOW_MAX,
608 crash_size, alignment);
609
610 if (!crash_base) {
611 pr_info("crashkernel reservation failed - No suitable area found.\n");
612 return;
613 }
614
615 } else {
616 unsigned long long start;
617
618 start = memblock_find_in_range(crash_base,
619 crash_base + crash_size, crash_size, 1<<20);
620 if (start != crash_base) {
621 pr_info("crashkernel reservation failed - memory is in use.\n");
622 return;
623 }
624 }
625 memblock_reserve(crash_base, crash_size);
626
627 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
628 "for crashkernel (System RAM: %ldMB)\n",
629 (unsigned long)(crash_size >> 20),
630 (unsigned long)(crash_base >> 20),
631 (unsigned long)(total_mem >> 20));
632
633 crashk_res.start = crash_base;
634 crashk_res.end = crash_base + crash_size - 1;
635 insert_resource(&iomem_resource, &crashk_res);
636
637 if (crash_base >= (1ULL<<32))
638 reserve_crashkernel_low();
639 }
640 #else
641 static void __init reserve_crashkernel(void)
642 {
643 }
644 #endif
645
646 static struct resource standard_io_resources[] = {
647 { .name = "dma1", .start = 0x00, .end = 0x1f,
648 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
649 { .name = "pic1", .start = 0x20, .end = 0x21,
650 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
651 { .name = "timer0", .start = 0x40, .end = 0x43,
652 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
653 { .name = "timer1", .start = 0x50, .end = 0x53,
654 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
655 { .name = "keyboard", .start = 0x60, .end = 0x60,
656 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
657 { .name = "keyboard", .start = 0x64, .end = 0x64,
658 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
659 { .name = "dma page reg", .start = 0x80, .end = 0x8f,
660 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
661 { .name = "pic2", .start = 0xa0, .end = 0xa1,
662 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
663 { .name = "dma2", .start = 0xc0, .end = 0xdf,
664 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
665 { .name = "fpu", .start = 0xf0, .end = 0xff,
666 .flags = IORESOURCE_BUSY | IORESOURCE_IO }
667 };
668
669 void __init reserve_standard_io_resources(void)
670 {
671 int i;
672
673 /* request I/O space for devices used on all i[345]86 PCs */
674 for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
675 request_resource(&ioport_resource, &standard_io_resources[i]);
676
677 }
678
679 static __init void reserve_ibft_region(void)
680 {
681 unsigned long addr, size = 0;
682
683 addr = find_ibft_region(&size);
684
685 if (size)
686 memblock_reserve(addr, size);
687 }
688
689 static bool __init snb_gfx_workaround_needed(void)
690 {
691 #ifdef CONFIG_PCI
692 int i;
693 u16 vendor, devid;
694 static const __initconst u16 snb_ids[] = {
695 0x0102,
696 0x0112,
697 0x0122,
698 0x0106,
699 0x0116,
700 0x0126,
701 0x010a,
702 };
703
704 /* Assume no if something weird is going on with PCI */
705 if (!early_pci_allowed())
706 return false;
707
708 vendor = read_pci_config_16(0, 2, 0, PCI_VENDOR_ID);
709 if (vendor != 0x8086)
710 return false;
711
712 devid = read_pci_config_16(0, 2, 0, PCI_DEVICE_ID);
713 for (i = 0; i < ARRAY_SIZE(snb_ids); i++)
714 if (devid == snb_ids[i])
715 return true;
716 #endif
717
718 return false;
719 }
720
721 /*
722 * Sandy Bridge graphics has trouble with certain ranges, exclude
723 * them from allocation.
724 */
725 static void __init trim_snb_memory(void)
726 {
727 static const __initconst unsigned long bad_pages[] = {
728 0x20050000,
729 0x20110000,
730 0x20130000,
731 0x20138000,
732 0x40004000,
733 };
734 int i;
735
736 if (!snb_gfx_workaround_needed())
737 return;
738
739 printk(KERN_DEBUG "reserving inaccessible SNB gfx pages\n");
740
741 /*
742 * Reserve all memory below the 1 MB mark that has not
743 * already been reserved.
744 */
745 memblock_reserve(0, 1<<20);
746
747 for (i = 0; i < ARRAY_SIZE(bad_pages); i++) {
748 if (memblock_reserve(bad_pages[i], PAGE_SIZE))
749 printk(KERN_WARNING "failed to reserve 0x%08lx\n",
750 bad_pages[i]);
751 }
752 }
753
754 /*
755 * Here we put platform-specific memory range workarounds, i.e.
756 * memory known to be corrupt or otherwise in need to be reserved on
757 * specific platforms.
758 *
759 * If this gets used more widely it could use a real dispatch mechanism.
760 */
761 static void __init trim_platform_memory_ranges(void)
762 {
763 trim_snb_memory();
764 }
765
766 static void __init trim_bios_range(void)
767 {
768 /*
769 * A special case is the first 4Kb of memory;
770 * This is a BIOS owned area, not kernel ram, but generally
771 * not listed as such in the E820 table.
772 *
773 * This typically reserves additional memory (64KiB by default)
774 * since some BIOSes are known to corrupt low memory. See the
775 * Kconfig help text for X86_RESERVE_LOW.
776 */
777 e820_update_range(0, PAGE_SIZE, E820_RAM, E820_RESERVED);
778
779 /*
780 * special case: Some BIOSen report the PC BIOS
781 * area (640->1Mb) as ram even though it is not.
782 * take them out.
783 */
784 e820_remove_range(BIOS_BEGIN, BIOS_END - BIOS_BEGIN, E820_RAM, 1);
785
786 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
787 }
788
789 /* called before trim_bios_range() to spare extra sanitize */
790 static void __init e820_add_kernel_range(void)
791 {
792 u64 start = __pa_symbol(_text);
793 u64 size = __pa_symbol(_end) - start;
794
795 /*
796 * Complain if .text .data and .bss are not marked as E820_RAM and
797 * attempt to fix it by adding the range. We may have a confused BIOS,
798 * or the user may have used memmap=exactmap or memmap=xxM$yyM to
799 * exclude kernel range. If we really are running on top non-RAM,
800 * we will crash later anyways.
801 */
802 if (e820_all_mapped(start, start + size, E820_RAM))
803 return;
804
805 pr_warn(".text .data .bss are not marked as E820_RAM!\n");
806 e820_remove_range(start, size, E820_RAM, 0);
807 e820_add_region(start, size, E820_RAM);
808 }
809
810 static unsigned reserve_low = CONFIG_X86_RESERVE_LOW << 10;
811
812 static int __init parse_reservelow(char *p)
813 {
814 unsigned long long size;
815
816 if (!p)
817 return -EINVAL;
818
819 size = memparse(p, &p);
820
821 if (size < 4096)
822 size = 4096;
823
824 if (size > 640*1024)
825 size = 640*1024;
826
827 reserve_low = size;
828
829 return 0;
830 }
831
832 early_param("reservelow", parse_reservelow);
833
834 static void __init trim_low_memory_range(void)
835 {
836 memblock_reserve(0, ALIGN(reserve_low, PAGE_SIZE));
837 }
838
839 /*
840 * Dump out kernel offset information on panic.
841 */
842 static int
843 dump_kernel_offset(struct notifier_block *self, unsigned long v, void *p)
844 {
845 if (kaslr_enabled)
846 pr_emerg("Kernel Offset: 0x%lx from 0x%lx (relocation range: 0x%lx-0x%lx)\n",
847 (unsigned long)&_text - __START_KERNEL,
848 __START_KERNEL,
849 __START_KERNEL_map,
850 MODULES_VADDR-1);
851 else
852 pr_emerg("Kernel Offset: disabled\n");
853
854 return 0;
855 }
856
857 /*
858 * Determine if we were loaded by an EFI loader. If so, then we have also been
859 * passed the efi memmap, systab, etc., so we should use these data structures
860 * for initialization. Note, the efi init code path is determined by the
861 * global efi_enabled. This allows the same kernel image to be used on existing
862 * systems (with a traditional BIOS) as well as on EFI systems.
863 */
864 /*
865 * setup_arch - architecture-specific boot-time initializations
866 *
867 * Note: On x86_64, fixmaps are ready for use even before this is called.
868 */
869
870 void __init setup_arch(char **cmdline_p)
871 {
872 memblock_reserve(__pa_symbol(_text),
873 (unsigned long)__bss_stop - (unsigned long)_text);
874
875 early_reserve_initrd();
876
877 /*
878 * At this point everything still needed from the boot loader
879 * or BIOS or kernel text should be early reserved or marked not
880 * RAM in e820. All other memory is free game.
881 */
882
883 #ifdef CONFIG_X86_32
884 memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
885
886 /*
887 * copy kernel address range established so far and switch
888 * to the proper swapper page table
889 */
890 clone_pgd_range(swapper_pg_dir + KERNEL_PGD_BOUNDARY,
891 initial_page_table + KERNEL_PGD_BOUNDARY,
892 KERNEL_PGD_PTRS);
893
894 load_cr3(swapper_pg_dir);
895 /*
896 * Note: Quark X1000 CPUs advertise PGE incorrectly and require
897 * a cr3 based tlb flush, so the following __flush_tlb_all()
898 * will not flush anything because the cpu quirk which clears
899 * X86_FEATURE_PGE has not been invoked yet. Though due to the
900 * load_cr3() above the TLB has been flushed already. The
901 * quirk is invoked before subsequent calls to __flush_tlb_all()
902 * so proper operation is guaranteed.
903 */
904 __flush_tlb_all();
905 #else
906 printk(KERN_INFO "Command line: %s\n", boot_command_line);
907 #endif
908
909 /*
910 * If we have OLPC OFW, we might end up relocating the fixmap due to
911 * reserve_top(), so do this before touching the ioremap area.
912 */
913 olpc_ofw_detect();
914
915 early_trap_init();
916 early_cpu_init();
917 early_ioremap_init();
918
919 setup_olpc_ofw_pgd();
920
921 ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
922 screen_info = boot_params.screen_info;
923 edid_info = boot_params.edid_info;
924 #ifdef CONFIG_X86_32
925 apm_info.bios = boot_params.apm_bios_info;
926 ist_info = boot_params.ist_info;
927 if (boot_params.sys_desc_table.length != 0) {
928 machine_id = boot_params.sys_desc_table.table[0];
929 machine_submodel_id = boot_params.sys_desc_table.table[1];
930 BIOS_revision = boot_params.sys_desc_table.table[2];
931 }
932 #endif
933 saved_video_mode = boot_params.hdr.vid_mode;
934 bootloader_type = boot_params.hdr.type_of_loader;
935 if ((bootloader_type >> 4) == 0xe) {
936 bootloader_type &= 0xf;
937 bootloader_type |= (boot_params.hdr.ext_loader_type+0x10) << 4;
938 }
939 bootloader_version = bootloader_type & 0xf;
940 bootloader_version |= boot_params.hdr.ext_loader_ver << 4;
941
942 #ifdef CONFIG_BLK_DEV_RAM
943 rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
944 rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
945 rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
946 #endif
947 #ifdef CONFIG_EFI
948 if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
949 EFI32_LOADER_SIGNATURE, 4)) {
950 set_bit(EFI_BOOT, &efi.flags);
951 } else if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
952 EFI64_LOADER_SIGNATURE, 4)) {
953 set_bit(EFI_BOOT, &efi.flags);
954 set_bit(EFI_64BIT, &efi.flags);
955 }
956
957 if (efi_enabled(EFI_BOOT))
958 efi_memblock_x86_reserve_range();
959 #endif
960
961 x86_init.oem.arch_setup();
962
963 iomem_resource.end = (1ULL << boot_cpu_data.x86_phys_bits) - 1;
964 setup_memory_map();
965 parse_setup_data();
966
967 copy_edd();
968
969 if (!boot_params.hdr.root_flags)
970 root_mountflags &= ~MS_RDONLY;
971 init_mm.start_code = (unsigned long) _text;
972 init_mm.end_code = (unsigned long) _etext;
973 init_mm.end_data = (unsigned long) _edata;
974 init_mm.brk = _brk_end;
975
976 mpx_mm_init(&init_mm);
977
978 code_resource.start = __pa_symbol(_text);
979 code_resource.end = __pa_symbol(_etext)-1;
980 data_resource.start = __pa_symbol(_etext);
981 data_resource.end = __pa_symbol(_edata)-1;
982 bss_resource.start = __pa_symbol(__bss_start);
983 bss_resource.end = __pa_symbol(__bss_stop)-1;
984
985 #ifdef CONFIG_CMDLINE_BOOL
986 #ifdef CONFIG_CMDLINE_OVERRIDE
987 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
988 #else
989 if (builtin_cmdline[0]) {
990 /* append boot loader cmdline to builtin */
991 strlcat(builtin_cmdline, " ", COMMAND_LINE_SIZE);
992 strlcat(builtin_cmdline, boot_command_line, COMMAND_LINE_SIZE);
993 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
994 }
995 #endif
996 #endif
997
998 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
999 *cmdline_p = command_line;
1000
1001 /*
1002 * x86_configure_nx() is called before parse_early_param() to detect
1003 * whether hardware doesn't support NX (so that the early EHCI debug
1004 * console setup can safely call set_fixmap()). It may then be called
1005 * again from within noexec_setup() during parsing early parameters
1006 * to honor the respective command line option.
1007 */
1008 x86_configure_nx();
1009
1010 parse_early_param();
1011
1012 x86_report_nx();
1013
1014 /* after early param, so could get panic from serial */
1015 memblock_x86_reserve_range_setup_data();
1016
1017 if (acpi_mps_check()) {
1018 #ifdef CONFIG_X86_LOCAL_APIC
1019 disable_apic = 1;
1020 #endif
1021 setup_clear_cpu_cap(X86_FEATURE_APIC);
1022 }
1023
1024 #ifdef CONFIG_PCI
1025 if (pci_early_dump_regs)
1026 early_dump_pci_devices();
1027 #endif
1028
1029 /* update the e820_saved too */
1030 e820_reserve_setup_data();
1031 finish_e820_parsing();
1032
1033 if (efi_enabled(EFI_BOOT))
1034 efi_init();
1035
1036 dmi_scan_machine();
1037 dmi_memdev_walk();
1038 dmi_set_dump_stack_arch_desc();
1039
1040 /*
1041 * VMware detection requires dmi to be available, so this
1042 * needs to be done after dmi_scan_machine, for the BP.
1043 */
1044 init_hypervisor_platform();
1045
1046 x86_init.resources.probe_roms();
1047
1048 /* after parse_early_param, so could debug it */
1049 insert_resource(&iomem_resource, &code_resource);
1050 insert_resource(&iomem_resource, &data_resource);
1051 insert_resource(&iomem_resource, &bss_resource);
1052
1053 e820_add_kernel_range();
1054 trim_bios_range();
1055 #ifdef CONFIG_X86_32
1056 if (ppro_with_ram_bug()) {
1057 e820_update_range(0x70000000ULL, 0x40000ULL, E820_RAM,
1058 E820_RESERVED);
1059 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
1060 printk(KERN_INFO "fixed physical RAM map:\n");
1061 e820_print_map("bad_ppro");
1062 }
1063 #else
1064 early_gart_iommu_check();
1065 #endif
1066
1067 /*
1068 * partially used pages are not usable - thus
1069 * we are rounding upwards:
1070 */
1071 max_pfn = e820_end_of_ram_pfn();
1072
1073 /* update e820 for memory not covered by WB MTRRs */
1074 mtrr_bp_init();
1075 if (mtrr_trim_uncached_memory(max_pfn))
1076 max_pfn = e820_end_of_ram_pfn();
1077
1078 #ifdef CONFIG_X86_32
1079 /* max_low_pfn get updated here */
1080 find_low_pfn_range();
1081 #else
1082 check_x2apic();
1083
1084 /* How many end-of-memory variables you have, grandma! */
1085 /* need this before calling reserve_initrd */
1086 if (max_pfn > (1UL<<(32 - PAGE_SHIFT)))
1087 max_low_pfn = e820_end_of_low_ram_pfn();
1088 else
1089 max_low_pfn = max_pfn;
1090
1091 high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
1092 #endif
1093
1094 /*
1095 * Find and reserve possible boot-time SMP configuration:
1096 */
1097 find_smp_config();
1098
1099 reserve_ibft_region();
1100
1101 early_alloc_pgt_buf();
1102
1103 /*
1104 * Need to conclude brk, before memblock_x86_fill()
1105 * it could use memblock_find_in_range, could overlap with
1106 * brk area.
1107 */
1108 reserve_brk();
1109
1110 cleanup_highmap();
1111
1112 memblock_set_current_limit(ISA_END_ADDRESS);
1113 memblock_x86_fill();
1114
1115 /*
1116 * The EFI specification says that boot service code won't be called
1117 * after ExitBootServices(). This is, in fact, a lie.
1118 */
1119 if (efi_enabled(EFI_MEMMAP))
1120 efi_reserve_boot_services();
1121
1122 /* preallocate 4k for mptable mpc */
1123 early_reserve_e820_mpc_new();
1124
1125 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
1126 setup_bios_corruption_check();
1127 #endif
1128
1129 #ifdef CONFIG_X86_32
1130 printk(KERN_DEBUG "initial memory mapped: [mem 0x00000000-%#010lx]\n",
1131 (max_pfn_mapped<<PAGE_SHIFT) - 1);
1132 #endif
1133
1134 reserve_real_mode();
1135
1136 trim_platform_memory_ranges();
1137 trim_low_memory_range();
1138
1139 init_mem_mapping();
1140
1141 early_trap_pf_init();
1142
1143 setup_real_mode();
1144
1145 memblock_set_current_limit(get_max_mapped());
1146
1147 /*
1148 * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
1149 */
1150
1151 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
1152 if (init_ohci1394_dma_early)
1153 init_ohci1394_dma_on_all_controllers();
1154 #endif
1155 /* Allocate bigger log buffer */
1156 setup_log_buf(1);
1157
1158 reserve_initrd();
1159
1160 #if defined(CONFIG_ACPI) && defined(CONFIG_BLK_DEV_INITRD)
1161 acpi_initrd_override((void *)initrd_start, initrd_end - initrd_start);
1162 #endif
1163
1164 vsmp_init();
1165
1166 io_delay_init();
1167
1168 /*
1169 * Parse the ACPI tables for possible boot-time SMP configuration.
1170 */
1171 acpi_boot_table_init();
1172
1173 early_acpi_boot_init();
1174
1175 initmem_init();
1176 dma_contiguous_reserve(max_pfn_mapped << PAGE_SHIFT);
1177
1178 /*
1179 * Reserve memory for crash kernel after SRAT is parsed so that it
1180 * won't consume hotpluggable memory.
1181 */
1182 reserve_crashkernel();
1183
1184 memblock_find_dma_reserve();
1185
1186 #ifdef CONFIG_KVM_GUEST
1187 kvmclock_init();
1188 #endif
1189
1190 x86_init.paging.pagetable_init();
1191
1192 kasan_init();
1193
1194 if (boot_cpu_data.cpuid_level >= 0) {
1195 /* A CPU has %cr4 if and only if it has CPUID */
1196 mmu_cr4_features = __read_cr4();
1197 if (trampoline_cr4_features)
1198 *trampoline_cr4_features = mmu_cr4_features;
1199 }
1200
1201 #ifdef CONFIG_X86_32
1202 /* sync back kernel address range */
1203 clone_pgd_range(initial_page_table + KERNEL_PGD_BOUNDARY,
1204 swapper_pg_dir + KERNEL_PGD_BOUNDARY,
1205 KERNEL_PGD_PTRS);
1206 #endif
1207
1208 tboot_probe();
1209
1210 map_vsyscall();
1211
1212 generic_apic_probe();
1213
1214 early_quirks();
1215
1216 /*
1217 * Read APIC and some other early information from ACPI tables.
1218 */
1219 acpi_boot_init();
1220 sfi_init();
1221 x86_dtb_init();
1222
1223 /*
1224 * get boot-time SMP configuration:
1225 */
1226 if (smp_found_config)
1227 get_smp_config();
1228
1229 prefill_possible_map();
1230
1231 init_cpu_to_node();
1232
1233 init_apic_mappings();
1234 if (x86_io_apic_ops.init)
1235 x86_io_apic_ops.init();
1236
1237 kvm_guest_init();
1238
1239 e820_reserve_resources();
1240 e820_mark_nosave_regions(max_low_pfn);
1241
1242 x86_init.resources.reserve_resources();
1243
1244 e820_setup_gap();
1245
1246 #ifdef CONFIG_VT
1247 #if defined(CONFIG_VGA_CONSOLE)
1248 if (!efi_enabled(EFI_BOOT) || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
1249 conswitchp = &vga_con;
1250 #elif defined(CONFIG_DUMMY_CONSOLE)
1251 conswitchp = &dummy_con;
1252 #endif
1253 #endif
1254 x86_init.oem.banner();
1255
1256 x86_init.timers.wallclock_init();
1257
1258 mcheck_init();
1259
1260 arch_init_ideal_nops();
1261
1262 register_refined_jiffies(CLOCK_TICK_RATE);
1263
1264 #ifdef CONFIG_EFI
1265 if (efi_enabled(EFI_BOOT))
1266 efi_apply_memmap_quirks();
1267 #endif
1268 }
1269
1270 #ifdef CONFIG_X86_32
1271
1272 static struct resource video_ram_resource = {
1273 .name = "Video RAM area",
1274 .start = 0xa0000,
1275 .end = 0xbffff,
1276 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
1277 };
1278
1279 void __init i386_reserve_resources(void)
1280 {
1281 request_resource(&iomem_resource, &video_ram_resource);
1282 reserve_standard_io_resources();
1283 }
1284
1285 #endif /* CONFIG_X86_32 */
1286
1287 static struct notifier_block kernel_offset_notifier = {
1288 .notifier_call = dump_kernel_offset
1289 };
1290
1291 static int __init register_kernel_offset_dumper(void)
1292 {
1293 atomic_notifier_chain_register(&panic_notifier_list,
1294 &kernel_offset_notifier);
1295 return 0;
1296 }
1297 __initcall(register_kernel_offset_dumper);