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TOMOYO Linux Cross Reference
Linux/arch/x86/kernel/setup.c

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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 #ifdef CONFIG_DMI
126 RESERVE_BRK(dmi_alloc, 65536);
127 #endif
128 
129 
130 static __initdata unsigned long _brk_start = (unsigned long)__brk_base;
131 unsigned long _brk_end = (unsigned long)__brk_base;
132 
133 #ifdef CONFIG_X86_64
134 int default_cpu_present_to_apicid(int mps_cpu)
135 {
136         return __default_cpu_present_to_apicid(mps_cpu);
137 }
138 
139 int default_check_phys_apicid_present(int phys_apicid)
140 {
141         return __default_check_phys_apicid_present(phys_apicid);
142 }
143 #endif
144 
145 struct boot_params boot_params;
146 
147 /*
148  * Machine setup..
149  */
150 static struct resource data_resource = {
151         .name   = "Kernel data",
152         .start  = 0,
153         .end    = 0,
154         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
155 };
156 
157 static struct resource code_resource = {
158         .name   = "Kernel code",
159         .start  = 0,
160         .end    = 0,
161         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
162 };
163 
164 static struct resource bss_resource = {
165         .name   = "Kernel bss",
166         .start  = 0,
167         .end    = 0,
168         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
169 };
170 
171 
172 #ifdef CONFIG_X86_32
173 /* cpu data as detected by the assembly code in head.S */
174 struct cpuinfo_x86 new_cpu_data = {
175         .wp_works_ok = -1,
176 };
177 /* common cpu data for all cpus */
178 struct cpuinfo_x86 boot_cpu_data __read_mostly = {
179         .wp_works_ok = -1,
180 };
181 EXPORT_SYMBOL(boot_cpu_data);
182 
183 unsigned int def_to_bigsmp;
184 
185 /* for MCA, but anyone else can use it if they want */
186 unsigned int machine_id;
187 unsigned int machine_submodel_id;
188 unsigned int BIOS_revision;
189 
190 struct apm_info apm_info;
191 EXPORT_SYMBOL(apm_info);
192 
193 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
194         defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
195 struct ist_info ist_info;
196 EXPORT_SYMBOL(ist_info);
197 #else
198 struct ist_info ist_info;
199 #endif
200 
201 #else
202 struct cpuinfo_x86 boot_cpu_data __read_mostly = {
203         .x86_phys_bits = MAX_PHYSMEM_BITS,
204 };
205 EXPORT_SYMBOL(boot_cpu_data);
206 #endif
207 
208 
209 #if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64)
210 __visible unsigned long mmu_cr4_features;
211 #else
212 __visible unsigned long mmu_cr4_features = X86_CR4_PAE;
213 #endif
214 
215 /* Boot loader ID and version as integers, for the benefit of proc_dointvec */
216 int bootloader_type, bootloader_version;
217 
218 /*
219  * Setup options
220  */
221 struct screen_info screen_info;
222 EXPORT_SYMBOL(screen_info);
223 struct edid_info edid_info;
224 EXPORT_SYMBOL_GPL(edid_info);
225 
226 extern int root_mountflags;
227 
228 unsigned long saved_video_mode;
229 
230 #define RAMDISK_IMAGE_START_MASK        0x07FF
231 #define RAMDISK_PROMPT_FLAG             0x8000
232 #define RAMDISK_LOAD_FLAG               0x4000
233 
234 static char __initdata command_line[COMMAND_LINE_SIZE];
235 #ifdef CONFIG_CMDLINE_BOOL
236 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
237 #endif
238 
239 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
240 struct edd edd;
241 #ifdef CONFIG_EDD_MODULE
242 EXPORT_SYMBOL(edd);
243 #endif
244 /**
245  * copy_edd() - Copy the BIOS EDD information
246  *              from boot_params into a safe place.
247  *
248  */
249 static inline void __init copy_edd(void)
250 {
251      memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer,
252             sizeof(edd.mbr_signature));
253      memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
254      edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
255      edd.edd_info_nr = boot_params.eddbuf_entries;
256 }
257 #else
258 static inline void __init copy_edd(void)
259 {
260 }
261 #endif
262 
263 void * __init extend_brk(size_t size, size_t align)
264 {
265         size_t mask = align - 1;
266         void *ret;
267 
268         BUG_ON(_brk_start == 0);
269         BUG_ON(align & mask);
270 
271         _brk_end = (_brk_end + mask) & ~mask;
272         BUG_ON((char *)(_brk_end + size) > __brk_limit);
273 
274         ret = (void *)_brk_end;
275         _brk_end += size;
276 
277         memset(ret, 0, size);
278 
279         return ret;
280 }
281 
282 #ifdef CONFIG_X86_32
283 static void __init cleanup_highmap(void)
284 {
285 }
286 #endif
287 
288 static void __init reserve_brk(void)
289 {
290         if (_brk_end > _brk_start)
291                 memblock_reserve(__pa_symbol(_brk_start),
292                                  _brk_end - _brk_start);
293 
294         /* Mark brk area as locked down and no longer taking any
295            new allocations */
296         _brk_start = 0;
297 }
298 
299 u64 relocated_ramdisk;
300 
301 #ifdef CONFIG_BLK_DEV_INITRD
302 
303 static u64 __init get_ramdisk_image(void)
304 {
305         u64 ramdisk_image = boot_params.hdr.ramdisk_image;
306 
307         ramdisk_image |= (u64)boot_params.ext_ramdisk_image << 32;
308 
309         return ramdisk_image;
310 }
311 static u64 __init get_ramdisk_size(void)
312 {
313         u64 ramdisk_size = boot_params.hdr.ramdisk_size;
314 
315         ramdisk_size |= (u64)boot_params.ext_ramdisk_size << 32;
316 
317         return ramdisk_size;
318 }
319 
320 static void __init relocate_initrd(void)
321 {
322         /* Assume only end is not page aligned */
323         u64 ramdisk_image = get_ramdisk_image();
324         u64 ramdisk_size  = get_ramdisk_size();
325         u64 area_size     = PAGE_ALIGN(ramdisk_size);
326 
327         /* We need to move the initrd down into directly mapped mem */
328         relocated_ramdisk = memblock_find_in_range(0, PFN_PHYS(max_pfn_mapped),
329                                                    area_size, PAGE_SIZE);
330 
331         if (!relocated_ramdisk)
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(relocated_ramdisk, area_size);
338         initrd_start = relocated_ramdisk + PAGE_OFFSET;
339         initrd_end   = initrd_start + ramdisk_size;
340         printk(KERN_INFO "Allocated new RAMDISK: [mem %#010llx-%#010llx]\n",
341                relocated_ramdisk, relocated_ramdisk + ramdisk_size - 1);
342 
343         copy_from_early_mem((void *)initrd_start, ramdisk_image, ramdisk_size);
344 
345         printk(KERN_INFO "Move RAMDISK from [mem %#010llx-%#010llx] to"
346                 " [mem %#010llx-%#010llx]\n",
347                 ramdisk_image, ramdisk_image + ramdisk_size - 1,
348                 relocated_ramdisk, relocated_ramdisk + ramdisk_size - 1);
349 }
350 
351 static void __init early_reserve_initrd(void)
352 {
353         /* Assume only end is not page aligned */
354         u64 ramdisk_image = get_ramdisk_image();
355         u64 ramdisk_size  = get_ramdisk_size();
356         u64 ramdisk_end   = PAGE_ALIGN(ramdisk_image + ramdisk_size);
357 
358         if (!boot_params.hdr.type_of_loader ||
359             !ramdisk_image || !ramdisk_size)
360                 return;         /* No initrd provided by bootloader */
361 
362         memblock_reserve(ramdisk_image, ramdisk_end - ramdisk_image);
363 }
364 static void __init reserve_initrd(void)
365 {
366         /* Assume only end is not page aligned */
367         u64 ramdisk_image = get_ramdisk_image();
368         u64 ramdisk_size  = get_ramdisk_size();
369         u64 ramdisk_end   = PAGE_ALIGN(ramdisk_image + ramdisk_size);
370         u64 mapped_size;
371 
372         if (!boot_params.hdr.type_of_loader ||
373             !ramdisk_image || !ramdisk_size)
374                 return;         /* No initrd provided by bootloader */
375 
376         initrd_start = 0;
377 
378         mapped_size = memblock_mem_size(max_pfn_mapped);
379         if (ramdisk_size >= (mapped_size>>1))
380                 panic("initrd too large to handle, "
381                        "disabling initrd (%lld needed, %lld available)\n",
382                        ramdisk_size, mapped_size>>1);
383 
384         printk(KERN_INFO "RAMDISK: [mem %#010llx-%#010llx]\n", ramdisk_image,
385                         ramdisk_end - 1);
386 
387         if (pfn_range_is_mapped(PFN_DOWN(ramdisk_image),
388                                 PFN_DOWN(ramdisk_end))) {
389                 /* All are mapped, easy case */
390                 initrd_start = ramdisk_image + PAGE_OFFSET;
391                 initrd_end = initrd_start + ramdisk_size;
392                 return;
393         }
394 
395         relocate_initrd();
396 
397         memblock_free(ramdisk_image, ramdisk_end - ramdisk_image);
398 }
399 #else
400 static void __init early_reserve_initrd(void)
401 {
402 }
403 static void __init reserve_initrd(void)
404 {
405 }
406 #endif /* CONFIG_BLK_DEV_INITRD */
407 
408 static void __init parse_setup_data(void)
409 {
410         struct setup_data *data;
411         u64 pa_data, pa_next;
412 
413         pa_data = boot_params.hdr.setup_data;
414         while (pa_data) {
415                 u32 data_len, data_type;
416 
417                 data = early_memremap(pa_data, sizeof(*data));
418                 data_len = data->len + sizeof(struct setup_data);
419                 data_type = data->type;
420                 pa_next = data->next;
421                 early_memunmap(data, sizeof(*data));
422 
423                 switch (data_type) {
424                 case SETUP_E820_EXT:
425                         parse_e820_ext(pa_data, data_len);
426                         break;
427                 case SETUP_DTB:
428                         add_dtb(pa_data);
429                         break;
430                 case SETUP_EFI:
431                         parse_efi_setup(pa_data, data_len);
432                         break;
433                 default:
434                         break;
435                 }
436                 pa_data = pa_next;
437         }
438 }
439 
440 static void __init e820_reserve_setup_data(void)
441 {
442         struct setup_data *data;
443         u64 pa_data;
444 
445         pa_data = boot_params.hdr.setup_data;
446         if (!pa_data)
447                 return;
448 
449         while (pa_data) {
450                 data = early_memremap(pa_data, sizeof(*data));
451                 e820_update_range(pa_data, sizeof(*data)+data->len,
452                          E820_RAM, E820_RESERVED_KERN);
453                 pa_data = data->next;
454                 early_memunmap(data, sizeof(*data));
455         }
456 
457         sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
458         memcpy(&e820_saved, &e820, sizeof(struct e820map));
459         printk(KERN_INFO "extended physical RAM map:\n");
460         e820_print_map("reserve setup_data");
461 }
462 
463 static void __init memblock_x86_reserve_range_setup_data(void)
464 {
465         struct setup_data *data;
466         u64 pa_data;
467 
468         pa_data = boot_params.hdr.setup_data;
469         while (pa_data) {
470                 data = early_memremap(pa_data, sizeof(*data));
471                 memblock_reserve(pa_data, sizeof(*data) + data->len);
472                 pa_data = data->next;
473                 early_memunmap(data, sizeof(*data));
474         }
475 }
476 
477 /*
478  * --------- Crashkernel reservation ------------------------------
479  */
480 
481 #ifdef CONFIG_KEXEC_CORE
482 
483 /*
484  * Keep the crash kernel below this limit.  On 32 bits earlier kernels
485  * would limit the kernel to the low 512 MiB due to mapping restrictions.
486  * On 64bit, old kexec-tools need to under 896MiB.
487  */
488 #ifdef CONFIG_X86_32
489 # define CRASH_KERNEL_ADDR_LOW_MAX      (512 << 20)
490 # define CRASH_KERNEL_ADDR_HIGH_MAX     (512 << 20)
491 #else
492 # define CRASH_KERNEL_ADDR_LOW_MAX      (896UL<<20)
493 # define CRASH_KERNEL_ADDR_HIGH_MAX     MAXMEM
494 #endif
495 
496 static void __init reserve_crashkernel_low(void)
497 {
498 #ifdef CONFIG_X86_64
499         const unsigned long long alignment = 16<<20;    /* 16M */
500         unsigned long long low_base = 0, low_size = 0;
501         unsigned long total_low_mem;
502         unsigned long long base;
503         bool auto_set = false;
504         int ret;
505 
506         total_low_mem = memblock_mem_size(1UL<<(32-PAGE_SHIFT));
507         /* crashkernel=Y,low */
508         ret = parse_crashkernel_low(boot_command_line, total_low_mem,
509                                                 &low_size, &base);
510         if (ret != 0) {
511                 /*
512                  * two parts from lib/swiotlb.c:
513                  * -swiotlb size: user-specified with swiotlb= or default.
514                  *
515                  * -swiotlb overflow buffer: now hardcoded to 32k. We round it
516                  * to 8M for other buffers that may need to stay low too. Also
517                  * make sure we allocate enough extra low memory so that we
518                  * don't run out of DMA buffers for 32-bit devices.
519                  */
520                 low_size = max(swiotlb_size_or_default() + (8UL<<20), 256UL<<20);
521                 auto_set = true;
522         } else {
523                 /* passed with crashkernel=0,low ? */
524                 if (!low_size)
525                         return;
526         }
527 
528         low_base = memblock_find_in_range(low_size, (1ULL<<32),
529                                         low_size, alignment);
530 
531         if (!low_base) {
532                 if (!auto_set)
533                         pr_info("crashkernel low reservation failed - No suitable area found.\n");
534 
535                 return;
536         }
537 
538         memblock_reserve(low_base, low_size);
539         pr_info("Reserving %ldMB of low memory at %ldMB for crashkernel (System low RAM: %ldMB)\n",
540                         (unsigned long)(low_size >> 20),
541                         (unsigned long)(low_base >> 20),
542                         (unsigned long)(total_low_mem >> 20));
543         crashk_low_res.start = low_base;
544         crashk_low_res.end   = low_base + low_size - 1;
545         insert_resource(&iomem_resource, &crashk_low_res);
546 #endif
547 }
548 
549 static void __init reserve_crashkernel(void)
550 {
551         const unsigned long long alignment = 16<<20;    /* 16M */
552         unsigned long long total_mem;
553         unsigned long long crash_size, crash_base;
554         bool high = false;
555         int ret;
556 
557         total_mem = memblock_phys_mem_size();
558 
559         /* crashkernel=XM */
560         ret = parse_crashkernel(boot_command_line, total_mem,
561                         &crash_size, &crash_base);
562         if (ret != 0 || crash_size <= 0) {
563                 /* crashkernel=X,high */
564                 ret = parse_crashkernel_high(boot_command_line, total_mem,
565                                 &crash_size, &crash_base);
566                 if (ret != 0 || crash_size <= 0)
567                         return;
568                 high = true;
569         }
570 
571         /* 0 means: find the address automatically */
572         if (crash_base <= 0) {
573                 /*
574                  *  kexec want bzImage is below CRASH_KERNEL_ADDR_MAX
575                  */
576                 crash_base = memblock_find_in_range(alignment,
577                                         high ? CRASH_KERNEL_ADDR_HIGH_MAX :
578                                                CRASH_KERNEL_ADDR_LOW_MAX,
579                                         crash_size, alignment);
580 
581                 if (!crash_base) {
582                         pr_info("crashkernel reservation failed - No suitable area found.\n");
583                         return;
584                 }
585 
586         } else {
587                 unsigned long long start;
588 
589                 start = memblock_find_in_range(crash_base,
590                                  crash_base + crash_size, crash_size, 1<<20);
591                 if (start != crash_base) {
592                         pr_info("crashkernel reservation failed - memory is in use.\n");
593                         return;
594                 }
595         }
596         memblock_reserve(crash_base, crash_size);
597 
598         printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
599                         "for crashkernel (System RAM: %ldMB)\n",
600                         (unsigned long)(crash_size >> 20),
601                         (unsigned long)(crash_base >> 20),
602                         (unsigned long)(total_mem >> 20));
603 
604         crashk_res.start = crash_base;
605         crashk_res.end   = crash_base + crash_size - 1;
606         insert_resource(&iomem_resource, &crashk_res);
607 
608         if (crash_base >= (1ULL<<32))
609                 reserve_crashkernel_low();
610 }
611 #else
612 static void __init reserve_crashkernel(void)
613 {
614 }
615 #endif
616 
617 static struct resource standard_io_resources[] = {
618         { .name = "dma1", .start = 0x00, .end = 0x1f,
619                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
620         { .name = "pic1", .start = 0x20, .end = 0x21,
621                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
622         { .name = "timer0", .start = 0x40, .end = 0x43,
623                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
624         { .name = "timer1", .start = 0x50, .end = 0x53,
625                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
626         { .name = "keyboard", .start = 0x60, .end = 0x60,
627                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
628         { .name = "keyboard", .start = 0x64, .end = 0x64,
629                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
630         { .name = "dma page reg", .start = 0x80, .end = 0x8f,
631                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
632         { .name = "pic2", .start = 0xa0, .end = 0xa1,
633                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
634         { .name = "dma2", .start = 0xc0, .end = 0xdf,
635                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
636         { .name = "fpu", .start = 0xf0, .end = 0xff,
637                 .flags = IORESOURCE_BUSY | IORESOURCE_IO }
638 };
639 
640 void __init reserve_standard_io_resources(void)
641 {
642         int i;
643 
644         /* request I/O space for devices used on all i[345]86 PCs */
645         for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
646                 request_resource(&ioport_resource, &standard_io_resources[i]);
647 
648 }
649 
650 static __init void reserve_ibft_region(void)
651 {
652         unsigned long addr, size = 0;
653 
654         addr = find_ibft_region(&size);
655 
656         if (size)
657                 memblock_reserve(addr, size);
658 }
659 
660 static bool __init snb_gfx_workaround_needed(void)
661 {
662 #ifdef CONFIG_PCI
663         int i;
664         u16 vendor, devid;
665         static const __initconst u16 snb_ids[] = {
666                 0x0102,
667                 0x0112,
668                 0x0122,
669                 0x0106,
670                 0x0116,
671                 0x0126,
672                 0x010a,
673         };
674 
675         /* Assume no if something weird is going on with PCI */
676         if (!early_pci_allowed())
677                 return false;
678 
679         vendor = read_pci_config_16(0, 2, 0, PCI_VENDOR_ID);
680         if (vendor != 0x8086)
681                 return false;
682 
683         devid = read_pci_config_16(0, 2, 0, PCI_DEVICE_ID);
684         for (i = 0; i < ARRAY_SIZE(snb_ids); i++)
685                 if (devid == snb_ids[i])
686                         return true;
687 #endif
688 
689         return false;
690 }
691 
692 /*
693  * Sandy Bridge graphics has trouble with certain ranges, exclude
694  * them from allocation.
695  */
696 static void __init trim_snb_memory(void)
697 {
698         static const __initconst unsigned long bad_pages[] = {
699                 0x20050000,
700                 0x20110000,
701                 0x20130000,
702                 0x20138000,
703                 0x40004000,
704         };
705         int i;
706 
707         if (!snb_gfx_workaround_needed())
708                 return;
709 
710         printk(KERN_DEBUG "reserving inaccessible SNB gfx pages\n");
711 
712         /*
713          * Reserve all memory below the 1 MB mark that has not
714          * already been reserved.
715          */
716         memblock_reserve(0, 1<<20);
717         
718         for (i = 0; i < ARRAY_SIZE(bad_pages); i++) {
719                 if (memblock_reserve(bad_pages[i], PAGE_SIZE))
720                         printk(KERN_WARNING "failed to reserve 0x%08lx\n",
721                                bad_pages[i]);
722         }
723 }
724 
725 /*
726  * Here we put platform-specific memory range workarounds, i.e.
727  * memory known to be corrupt or otherwise in need to be reserved on
728  * specific platforms.
729  *
730  * If this gets used more widely it could use a real dispatch mechanism.
731  */
732 static void __init trim_platform_memory_ranges(void)
733 {
734         trim_snb_memory();
735 }
736 
737 static void __init trim_bios_range(void)
738 {
739         /*
740          * A special case is the first 4Kb of memory;
741          * This is a BIOS owned area, not kernel ram, but generally
742          * not listed as such in the E820 table.
743          *
744          * This typically reserves additional memory (64KiB by default)
745          * since some BIOSes are known to corrupt low memory.  See the
746          * Kconfig help text for X86_RESERVE_LOW.
747          */
748         e820_update_range(0, PAGE_SIZE, E820_RAM, E820_RESERVED);
749 
750         /*
751          * special case: Some BIOSen report the PC BIOS
752          * area (640->1Mb) as ram even though it is not.
753          * take them out.
754          */
755         e820_remove_range(BIOS_BEGIN, BIOS_END - BIOS_BEGIN, E820_RAM, 1);
756 
757         sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
758 }
759 
760 /* called before trim_bios_range() to spare extra sanitize */
761 static void __init e820_add_kernel_range(void)
762 {
763         u64 start = __pa_symbol(_text);
764         u64 size = __pa_symbol(_end) - start;
765 
766         /*
767          * Complain if .text .data and .bss are not marked as E820_RAM and
768          * attempt to fix it by adding the range. We may have a confused BIOS,
769          * or the user may have used memmap=exactmap or memmap=xxM$yyM to
770          * exclude kernel range. If we really are running on top non-RAM,
771          * we will crash later anyways.
772          */
773         if (e820_all_mapped(start, start + size, E820_RAM))
774                 return;
775 
776         pr_warn(".text .data .bss are not marked as E820_RAM!\n");
777         e820_remove_range(start, size, E820_RAM, 0);
778         e820_add_region(start, size, E820_RAM);
779 }
780 
781 static unsigned reserve_low = CONFIG_X86_RESERVE_LOW << 10;
782 
783 static int __init parse_reservelow(char *p)
784 {
785         unsigned long long size;
786 
787         if (!p)
788                 return -EINVAL;
789 
790         size = memparse(p, &p);
791 
792         if (size < 4096)
793                 size = 4096;
794 
795         if (size > 640*1024)
796                 size = 640*1024;
797 
798         reserve_low = size;
799 
800         return 0;
801 }
802 
803 early_param("reservelow", parse_reservelow);
804 
805 static void __init trim_low_memory_range(void)
806 {
807         memblock_reserve(0, ALIGN(reserve_low, PAGE_SIZE));
808 }
809         
810 /*
811  * Dump out kernel offset information on panic.
812  */
813 static int
814 dump_kernel_offset(struct notifier_block *self, unsigned long v, void *p)
815 {
816         if (kaslr_enabled()) {
817                 pr_emerg("Kernel Offset: 0x%lx from 0x%lx (relocation range: 0x%lx-0x%lx)\n",
818                          kaslr_offset(),
819                          __START_KERNEL,
820                          __START_KERNEL_map,
821                          MODULES_VADDR-1);
822         } else {
823                 pr_emerg("Kernel Offset: disabled\n");
824         }
825 
826         return 0;
827 }
828 
829 /*
830  * Determine if we were loaded by an EFI loader.  If so, then we have also been
831  * passed the efi memmap, systab, etc., so we should use these data structures
832  * for initialization.  Note, the efi init code path is determined by the
833  * global efi_enabled. This allows the same kernel image to be used on existing
834  * systems (with a traditional BIOS) as well as on EFI systems.
835  */
836 /*
837  * setup_arch - architecture-specific boot-time initializations
838  *
839  * Note: On x86_64, fixmaps are ready for use even before this is called.
840  */
841 
842 void __init setup_arch(char **cmdline_p)
843 {
844         memblock_reserve(__pa_symbol(_text),
845                          (unsigned long)__bss_stop - (unsigned long)_text);
846 
847         early_reserve_initrd();
848 
849         /*
850          * At this point everything still needed from the boot loader
851          * or BIOS or kernel text should be early reserved or marked not
852          * RAM in e820. All other memory is free game.
853          */
854 
855 #ifdef CONFIG_X86_32
856         memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
857 
858         /*
859          * copy kernel address range established so far and switch
860          * to the proper swapper page table
861          */
862         clone_pgd_range(swapper_pg_dir     + KERNEL_PGD_BOUNDARY,
863                         initial_page_table + KERNEL_PGD_BOUNDARY,
864                         KERNEL_PGD_PTRS);
865 
866         load_cr3(swapper_pg_dir);
867         /*
868          * Note: Quark X1000 CPUs advertise PGE incorrectly and require
869          * a cr3 based tlb flush, so the following __flush_tlb_all()
870          * will not flush anything because the cpu quirk which clears
871          * X86_FEATURE_PGE has not been invoked yet. Though due to the
872          * load_cr3() above the TLB has been flushed already. The
873          * quirk is invoked before subsequent calls to __flush_tlb_all()
874          * so proper operation is guaranteed.
875          */
876         __flush_tlb_all();
877 #else
878         printk(KERN_INFO "Command line: %s\n", boot_command_line);
879 #endif
880 
881         /*
882          * If we have OLPC OFW, we might end up relocating the fixmap due to
883          * reserve_top(), so do this before touching the ioremap area.
884          */
885         olpc_ofw_detect();
886 
887         early_trap_init();
888         early_cpu_init();
889         early_ioremap_init();
890 
891         setup_olpc_ofw_pgd();
892 
893         ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
894         screen_info = boot_params.screen_info;
895         edid_info = boot_params.edid_info;
896 #ifdef CONFIG_X86_32
897         apm_info.bios = boot_params.apm_bios_info;
898         ist_info = boot_params.ist_info;
899 #endif
900         saved_video_mode = boot_params.hdr.vid_mode;
901         bootloader_type = boot_params.hdr.type_of_loader;
902         if ((bootloader_type >> 4) == 0xe) {
903                 bootloader_type &= 0xf;
904                 bootloader_type |= (boot_params.hdr.ext_loader_type+0x10) << 4;
905         }
906         bootloader_version  = bootloader_type & 0xf;
907         bootloader_version |= boot_params.hdr.ext_loader_ver << 4;
908 
909 #ifdef CONFIG_BLK_DEV_RAM
910         rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
911         rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
912         rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
913 #endif
914 #ifdef CONFIG_EFI
915         if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
916                      EFI32_LOADER_SIGNATURE, 4)) {
917                 set_bit(EFI_BOOT, &efi.flags);
918         } else if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
919                      EFI64_LOADER_SIGNATURE, 4)) {
920                 set_bit(EFI_BOOT, &efi.flags);
921                 set_bit(EFI_64BIT, &efi.flags);
922         }
923 
924         if (efi_enabled(EFI_BOOT))
925                 efi_memblock_x86_reserve_range();
926 #endif
927 
928         x86_init.oem.arch_setup();
929 
930         iomem_resource.end = (1ULL << boot_cpu_data.x86_phys_bits) - 1;
931         setup_memory_map();
932         parse_setup_data();
933 
934         copy_edd();
935 
936         if (!boot_params.hdr.root_flags)
937                 root_mountflags &= ~MS_RDONLY;
938         init_mm.start_code = (unsigned long) _text;
939         init_mm.end_code = (unsigned long) _etext;
940         init_mm.end_data = (unsigned long) _edata;
941         init_mm.brk = _brk_end;
942 
943         mpx_mm_init(&init_mm);
944 
945         code_resource.start = __pa_symbol(_text);
946         code_resource.end = __pa_symbol(_etext)-1;
947         data_resource.start = __pa_symbol(_etext);
948         data_resource.end = __pa_symbol(_edata)-1;
949         bss_resource.start = __pa_symbol(__bss_start);
950         bss_resource.end = __pa_symbol(__bss_stop)-1;
951 
952 #ifdef CONFIG_CMDLINE_BOOL
953 #ifdef CONFIG_CMDLINE_OVERRIDE
954         strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
955 #else
956         if (builtin_cmdline[0]) {
957                 /* append boot loader cmdline to builtin */
958                 strlcat(builtin_cmdline, " ", COMMAND_LINE_SIZE);
959                 strlcat(builtin_cmdline, boot_command_line, COMMAND_LINE_SIZE);
960                 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
961         }
962 #endif
963 #endif
964 
965         strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
966         *cmdline_p = command_line;
967 
968         /*
969          * x86_configure_nx() is called before parse_early_param() to detect
970          * whether hardware doesn't support NX (so that the early EHCI debug
971          * console setup can safely call set_fixmap()). It may then be called
972          * again from within noexec_setup() during parsing early parameters
973          * to honor the respective command line option.
974          */
975         x86_configure_nx();
976 
977         parse_early_param();
978 
979         x86_report_nx();
980 
981         /* after early param, so could get panic from serial */
982         memblock_x86_reserve_range_setup_data();
983 
984         if (acpi_mps_check()) {
985 #ifdef CONFIG_X86_LOCAL_APIC
986                 disable_apic = 1;
987 #endif
988                 setup_clear_cpu_cap(X86_FEATURE_APIC);
989         }
990 
991 #ifdef CONFIG_PCI
992         if (pci_early_dump_regs)
993                 early_dump_pci_devices();
994 #endif
995 
996         /* update the e820_saved too */
997         e820_reserve_setup_data();
998         finish_e820_parsing();
999 
1000         if (efi_enabled(EFI_BOOT))
1001                 efi_init();
1002 
1003         dmi_scan_machine();
1004         dmi_memdev_walk();
1005         dmi_set_dump_stack_arch_desc();
1006 
1007         /*
1008          * VMware detection requires dmi to be available, so this
1009          * needs to be done after dmi_scan_machine, for the BP.
1010          */
1011         init_hypervisor_platform();
1012 
1013         x86_init.resources.probe_roms();
1014 
1015         /* after parse_early_param, so could debug it */
1016         insert_resource(&iomem_resource, &code_resource);
1017         insert_resource(&iomem_resource, &data_resource);
1018         insert_resource(&iomem_resource, &bss_resource);
1019 
1020         e820_add_kernel_range();
1021         trim_bios_range();
1022 #ifdef CONFIG_X86_32
1023         if (ppro_with_ram_bug()) {
1024                 e820_update_range(0x70000000ULL, 0x40000ULL, E820_RAM,
1025                                   E820_RESERVED);
1026                 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
1027                 printk(KERN_INFO "fixed physical RAM map:\n");
1028                 e820_print_map("bad_ppro");
1029         }
1030 #else
1031         early_gart_iommu_check();
1032 #endif
1033 
1034         /*
1035          * partially used pages are not usable - thus
1036          * we are rounding upwards:
1037          */
1038         max_pfn = e820_end_of_ram_pfn();
1039 
1040         /* update e820 for memory not covered by WB MTRRs */
1041         mtrr_bp_init();
1042         if (mtrr_trim_uncached_memory(max_pfn))
1043                 max_pfn = e820_end_of_ram_pfn();
1044 
1045 #ifdef CONFIG_X86_32
1046         /* max_low_pfn get updated here */
1047         find_low_pfn_range();
1048 #else
1049         check_x2apic();
1050 
1051         /* How many end-of-memory variables you have, grandma! */
1052         /* need this before calling reserve_initrd */
1053         if (max_pfn > (1UL<<(32 - PAGE_SHIFT)))
1054                 max_low_pfn = e820_end_of_low_ram_pfn();
1055         else
1056                 max_low_pfn = max_pfn;
1057 
1058         high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
1059 #endif
1060 
1061         /*
1062          * Find and reserve possible boot-time SMP configuration:
1063          */
1064         find_smp_config();
1065 
1066         reserve_ibft_region();
1067 
1068         early_alloc_pgt_buf();
1069 
1070         /*
1071          * Need to conclude brk, before memblock_x86_fill()
1072          *  it could use memblock_find_in_range, could overlap with
1073          *  brk area.
1074          */
1075         reserve_brk();
1076 
1077         cleanup_highmap();
1078 
1079         memblock_set_current_limit(ISA_END_ADDRESS);
1080         memblock_x86_fill();
1081 
1082         if (efi_enabled(EFI_BOOT))
1083                 efi_find_mirror();
1084 
1085         /*
1086          * The EFI specification says that boot service code won't be called
1087          * after ExitBootServices(). This is, in fact, a lie.
1088          */
1089         if (efi_enabled(EFI_MEMMAP))
1090                 efi_reserve_boot_services();
1091 
1092         /* preallocate 4k for mptable mpc */
1093         early_reserve_e820_mpc_new();
1094 
1095 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
1096         setup_bios_corruption_check();
1097 #endif
1098 
1099 #ifdef CONFIG_X86_32
1100         printk(KERN_DEBUG "initial memory mapped: [mem 0x00000000-%#010lx]\n",
1101                         (max_pfn_mapped<<PAGE_SHIFT) - 1);
1102 #endif
1103 
1104         reserve_real_mode();
1105 
1106         trim_platform_memory_ranges();
1107         trim_low_memory_range();
1108 
1109         init_mem_mapping();
1110 
1111         early_trap_pf_init();
1112 
1113         setup_real_mode();
1114 
1115         memblock_set_current_limit(get_max_mapped());
1116 
1117         /*
1118          * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
1119          */
1120 
1121 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
1122         if (init_ohci1394_dma_early)
1123                 init_ohci1394_dma_on_all_controllers();
1124 #endif
1125         /* Allocate bigger log buffer */
1126         setup_log_buf(1);
1127 
1128         reserve_initrd();
1129 
1130 #if defined(CONFIG_ACPI) && defined(CONFIG_BLK_DEV_INITRD)
1131         acpi_initrd_override((void *)initrd_start, initrd_end - initrd_start);
1132 #endif
1133 
1134         vsmp_init();
1135 
1136         io_delay_init();
1137 
1138         /*
1139          * Parse the ACPI tables for possible boot-time SMP configuration.
1140          */
1141         acpi_boot_table_init();
1142 
1143         early_acpi_boot_init();
1144 
1145         initmem_init();
1146         dma_contiguous_reserve(max_pfn_mapped << PAGE_SHIFT);
1147 
1148         /*
1149          * Reserve memory for crash kernel after SRAT is parsed so that it
1150          * won't consume hotpluggable memory.
1151          */
1152         reserve_crashkernel();
1153 
1154         memblock_find_dma_reserve();
1155 
1156 #ifdef CONFIG_KVM_GUEST
1157         kvmclock_init();
1158 #endif
1159 
1160         x86_init.paging.pagetable_init();
1161 
1162         kasan_init();
1163 
1164         if (boot_cpu_data.cpuid_level >= 0) {
1165                 /* A CPU has %cr4 if and only if it has CPUID */
1166                 mmu_cr4_features = __read_cr4();
1167                 if (trampoline_cr4_features)
1168                         *trampoline_cr4_features = mmu_cr4_features;
1169         }
1170 
1171 #ifdef CONFIG_X86_32
1172         /* sync back kernel address range */
1173         clone_pgd_range(initial_page_table + KERNEL_PGD_BOUNDARY,
1174                         swapper_pg_dir     + KERNEL_PGD_BOUNDARY,
1175                         KERNEL_PGD_PTRS);
1176 
1177         /*
1178          * sync back low identity map too.  It is used for example
1179          * in the 32-bit EFI stub.
1180          */
1181         clone_pgd_range(initial_page_table,
1182                         swapper_pg_dir     + KERNEL_PGD_BOUNDARY,
1183                         min(KERNEL_PGD_PTRS, KERNEL_PGD_BOUNDARY));
1184 #endif
1185 
1186         tboot_probe();
1187 
1188         map_vsyscall();
1189 
1190         generic_apic_probe();
1191 
1192         early_quirks();
1193 
1194         /*
1195          * Read APIC and some other early information from ACPI tables.
1196          */
1197         acpi_boot_init();
1198         sfi_init();
1199         x86_dtb_init();
1200 
1201         /*
1202          * get boot-time SMP configuration:
1203          */
1204         if (smp_found_config)
1205                 get_smp_config();
1206 
1207         prefill_possible_map();
1208 
1209         init_cpu_to_node();
1210 
1211         init_apic_mappings();
1212         io_apic_init_mappings();
1213 
1214         kvm_guest_init();
1215 
1216         e820_reserve_resources();
1217         e820_mark_nosave_regions(max_low_pfn);
1218 
1219         x86_init.resources.reserve_resources();
1220 
1221         e820_setup_gap();
1222 
1223 #ifdef CONFIG_VT
1224 #if defined(CONFIG_VGA_CONSOLE)
1225         if (!efi_enabled(EFI_BOOT) || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
1226                 conswitchp = &vga_con;
1227 #elif defined(CONFIG_DUMMY_CONSOLE)
1228         conswitchp = &dummy_con;
1229 #endif
1230 #endif
1231         x86_init.oem.banner();
1232 
1233         x86_init.timers.wallclock_init();
1234 
1235         mcheck_init();
1236 
1237         arch_init_ideal_nops();
1238 
1239         register_refined_jiffies(CLOCK_TICK_RATE);
1240 
1241 #ifdef CONFIG_EFI
1242         if (efi_enabled(EFI_BOOT))
1243                 efi_apply_memmap_quirks();
1244 #endif
1245 }
1246 
1247 #ifdef CONFIG_X86_32
1248 
1249 static struct resource video_ram_resource = {
1250         .name   = "Video RAM area",
1251         .start  = 0xa0000,
1252         .end    = 0xbffff,
1253         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
1254 };
1255 
1256 void __init i386_reserve_resources(void)
1257 {
1258         request_resource(&iomem_resource, &video_ram_resource);
1259         reserve_standard_io_resources();
1260 }
1261 
1262 #endif /* CONFIG_X86_32 */
1263 
1264 static struct notifier_block kernel_offset_notifier = {
1265         .notifier_call = dump_kernel_offset
1266 };
1267 
1268 static int __init register_kernel_offset_dumper(void)
1269 {
1270         atomic_notifier_chain_register(&panic_notifier_list,
1271                                         &kernel_offset_notifier);
1272         return 0;
1273 }
1274 __initcall(register_kernel_offset_dumper);
1275 

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