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Linux/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/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 #include <asm/microcode.h>
115 
116 /*
117  * max_low_pfn_mapped: highest direct mapped pfn under 4GB
118  * max_pfn_mapped:     highest direct mapped pfn over 4GB
119  *
120  * The direct mapping only covers E820_RAM regions, so the ranges and gaps are
121  * represented by pfn_mapped
122  */
123 unsigned long max_low_pfn_mapped;
124 unsigned long max_pfn_mapped;
125 
126 #ifdef CONFIG_DMI
127 RESERVE_BRK(dmi_alloc, 65536);
128 #endif
129 
130 
131 static __initdata unsigned long _brk_start = (unsigned long)__brk_base;
132 unsigned long _brk_end = (unsigned long)__brk_base;
133 
134 #ifdef CONFIG_X86_64
135 int default_cpu_present_to_apicid(int mps_cpu)
136 {
137         return __default_cpu_present_to_apicid(mps_cpu);
138 }
139 
140 int default_check_phys_apicid_present(int phys_apicid)
141 {
142         return __default_check_phys_apicid_present(phys_apicid);
143 }
144 #endif
145 
146 struct boot_params boot_params;
147 
148 /*
149  * Machine setup..
150  */
151 static struct resource data_resource = {
152         .name   = "Kernel data",
153         .start  = 0,
154         .end    = 0,
155         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
156 };
157 
158 static struct resource code_resource = {
159         .name   = "Kernel code",
160         .start  = 0,
161         .end    = 0,
162         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
163 };
164 
165 static struct resource bss_resource = {
166         .name   = "Kernel bss",
167         .start  = 0,
168         .end    = 0,
169         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
170 };
171 
172 
173 #ifdef CONFIG_X86_32
174 /* cpu data as detected by the assembly code in head.S */
175 struct cpuinfo_x86 new_cpu_data = {
176         .wp_works_ok = -1,
177 };
178 /* common cpu data for all cpus */
179 struct cpuinfo_x86 boot_cpu_data __read_mostly = {
180         .wp_works_ok = -1,
181 };
182 EXPORT_SYMBOL(boot_cpu_data);
183 
184 unsigned int def_to_bigsmp;
185 
186 /* for MCA, but anyone else can use it if they want */
187 unsigned int machine_id;
188 unsigned int machine_submodel_id;
189 unsigned int BIOS_revision;
190 
191 struct apm_info apm_info;
192 EXPORT_SYMBOL(apm_info);
193 
194 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
195         defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
196 struct ist_info ist_info;
197 EXPORT_SYMBOL(ist_info);
198 #else
199 struct ist_info ist_info;
200 #endif
201 
202 #else
203 struct cpuinfo_x86 boot_cpu_data __read_mostly = {
204         .x86_phys_bits = MAX_PHYSMEM_BITS,
205 };
206 EXPORT_SYMBOL(boot_cpu_data);
207 #endif
208 
209 
210 #if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64)
211 __visible unsigned long mmu_cr4_features;
212 #else
213 __visible unsigned long mmu_cr4_features = X86_CR4_PAE;
214 #endif
215 
216 /* Boot loader ID and version as integers, for the benefit of proc_dointvec */
217 int bootloader_type, bootloader_version;
218 
219 /*
220  * Setup options
221  */
222 struct screen_info screen_info;
223 EXPORT_SYMBOL(screen_info);
224 struct edid_info edid_info;
225 EXPORT_SYMBOL_GPL(edid_info);
226 
227 extern int root_mountflags;
228 
229 unsigned long saved_video_mode;
230 
231 #define RAMDISK_IMAGE_START_MASK        0x07FF
232 #define RAMDISK_PROMPT_FLAG             0x8000
233 #define RAMDISK_LOAD_FLAG               0x4000
234 
235 static char __initdata command_line[COMMAND_LINE_SIZE];
236 #ifdef CONFIG_CMDLINE_BOOL
237 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
238 #endif
239 
240 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
241 struct edd edd;
242 #ifdef CONFIG_EDD_MODULE
243 EXPORT_SYMBOL(edd);
244 #endif
245 /**
246  * copy_edd() - Copy the BIOS EDD information
247  *              from boot_params into a safe place.
248  *
249  */
250 static inline void __init copy_edd(void)
251 {
252      memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer,
253             sizeof(edd.mbr_signature));
254      memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
255      edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
256      edd.edd_info_nr = boot_params.eddbuf_entries;
257 }
258 #else
259 static inline void __init copy_edd(void)
260 {
261 }
262 #endif
263 
264 void * __init extend_brk(size_t size, size_t align)
265 {
266         size_t mask = align - 1;
267         void *ret;
268 
269         BUG_ON(_brk_start == 0);
270         BUG_ON(align & mask);
271 
272         _brk_end = (_brk_end + mask) & ~mask;
273         BUG_ON((char *)(_brk_end + size) > __brk_limit);
274 
275         ret = (void *)_brk_end;
276         _brk_end += size;
277 
278         memset(ret, 0, size);
279 
280         return ret;
281 }
282 
283 #ifdef CONFIG_X86_32
284 static void __init cleanup_highmap(void)
285 {
286 }
287 #endif
288 
289 static void __init reserve_brk(void)
290 {
291         if (_brk_end > _brk_start)
292                 memblock_reserve(__pa_symbol(_brk_start),
293                                  _brk_end - _brk_start);
294 
295         /* Mark brk area as locked down and no longer taking any
296            new allocations */
297         _brk_start = 0;
298 }
299 
300 u64 relocated_ramdisk;
301 
302 #ifdef CONFIG_BLK_DEV_INITRD
303 
304 static u64 __init get_ramdisk_image(void)
305 {
306         u64 ramdisk_image = boot_params.hdr.ramdisk_image;
307 
308         ramdisk_image |= (u64)boot_params.ext_ramdisk_image << 32;
309 
310         return ramdisk_image;
311 }
312 static u64 __init get_ramdisk_size(void)
313 {
314         u64 ramdisk_size = boot_params.hdr.ramdisk_size;
315 
316         ramdisk_size |= (u64)boot_params.ext_ramdisk_size << 32;
317 
318         return ramdisk_size;
319 }
320 
321 static void __init relocate_initrd(void)
322 {
323         /* Assume only end is not page aligned */
324         u64 ramdisk_image = get_ramdisk_image();
325         u64 ramdisk_size  = get_ramdisk_size();
326         u64 area_size     = PAGE_ALIGN(ramdisk_size);
327 
328         /* We need to move the initrd down into directly mapped mem */
329         relocated_ramdisk = memblock_find_in_range(0, PFN_PHYS(max_pfn_mapped),
330                                                    area_size, PAGE_SIZE);
331 
332         if (!relocated_ramdisk)
333                 panic("Cannot find place for new RAMDISK of size %lld\n",
334                       ramdisk_size);
335 
336         /* Note: this includes all the mem currently occupied by
337            the initrd, we rely on that fact to keep the data intact. */
338         memblock_reserve(relocated_ramdisk, area_size);
339         initrd_start = relocated_ramdisk + PAGE_OFFSET;
340         initrd_end   = initrd_start + ramdisk_size;
341         printk(KERN_INFO "Allocated new RAMDISK: [mem %#010llx-%#010llx]\n",
342                relocated_ramdisk, relocated_ramdisk + ramdisk_size - 1);
343 
344         copy_from_early_mem((void *)initrd_start, ramdisk_image, ramdisk_size);
345 
346         printk(KERN_INFO "Move RAMDISK from [mem %#010llx-%#010llx] to"
347                 " [mem %#010llx-%#010llx]\n",
348                 ramdisk_image, ramdisk_image + ramdisk_size - 1,
349                 relocated_ramdisk, relocated_ramdisk + ramdisk_size - 1);
350 }
351 
352 static void __init early_reserve_initrd(void)
353 {
354         /* Assume only end is not page aligned */
355         u64 ramdisk_image = get_ramdisk_image();
356         u64 ramdisk_size  = get_ramdisk_size();
357         u64 ramdisk_end   = PAGE_ALIGN(ramdisk_image + ramdisk_size);
358 
359         if (!boot_params.hdr.type_of_loader ||
360             !ramdisk_image || !ramdisk_size)
361                 return;         /* No initrd provided by bootloader */
362 
363         memblock_reserve(ramdisk_image, ramdisk_end - ramdisk_image);
364 }
365 static void __init reserve_initrd(void)
366 {
367         /* Assume only end is not page aligned */
368         u64 ramdisk_image = get_ramdisk_image();
369         u64 ramdisk_size  = get_ramdisk_size();
370         u64 ramdisk_end   = PAGE_ALIGN(ramdisk_image + ramdisk_size);
371         u64 mapped_size;
372 
373         if (!boot_params.hdr.type_of_loader ||
374             !ramdisk_image || !ramdisk_size)
375                 return;         /* No initrd provided by bootloader */
376 
377         initrd_start = 0;
378 
379         mapped_size = memblock_mem_size(max_pfn_mapped);
380         if (ramdisk_size >= (mapped_size>>1))
381                 panic("initrd too large to handle, "
382                        "disabling initrd (%lld needed, %lld available)\n",
383                        ramdisk_size, mapped_size>>1);
384 
385         printk(KERN_INFO "RAMDISK: [mem %#010llx-%#010llx]\n", ramdisk_image,
386                         ramdisk_end - 1);
387 
388         if (pfn_range_is_mapped(PFN_DOWN(ramdisk_image),
389                                 PFN_DOWN(ramdisk_end))) {
390                 /* All are mapped, easy case */
391                 initrd_start = ramdisk_image + PAGE_OFFSET;
392                 initrd_end = initrd_start + ramdisk_size;
393                 return;
394         }
395 
396         relocate_initrd();
397 
398         memblock_free(ramdisk_image, ramdisk_end - ramdisk_image);
399 }
400 #else
401 static void __init early_reserve_initrd(void)
402 {
403 }
404 static void __init reserve_initrd(void)
405 {
406 }
407 #endif /* CONFIG_BLK_DEV_INITRD */
408 
409 static void __init parse_setup_data(void)
410 {
411         struct setup_data *data;
412         u64 pa_data, pa_next;
413 
414         pa_data = boot_params.hdr.setup_data;
415         while (pa_data) {
416                 u32 data_len, data_type;
417 
418                 data = early_memremap(pa_data, sizeof(*data));
419                 data_len = data->len + sizeof(struct setup_data);
420                 data_type = data->type;
421                 pa_next = data->next;
422                 early_memunmap(data, sizeof(*data));
423 
424                 switch (data_type) {
425                 case SETUP_E820_EXT:
426                         parse_e820_ext(pa_data, data_len);
427                         break;
428                 case SETUP_DTB:
429                         add_dtb(pa_data);
430                         break;
431                 case SETUP_EFI:
432                         parse_efi_setup(pa_data, data_len);
433                         break;
434                 default:
435                         break;
436                 }
437                 pa_data = pa_next;
438         }
439 }
440 
441 static void __init e820_reserve_setup_data(void)
442 {
443         struct setup_data *data;
444         u64 pa_data;
445 
446         pa_data = boot_params.hdr.setup_data;
447         if (!pa_data)
448                 return;
449 
450         while (pa_data) {
451                 data = early_memremap(pa_data, sizeof(*data));
452                 e820_update_range(pa_data, sizeof(*data)+data->len,
453                          E820_RAM, E820_RESERVED_KERN);
454                 pa_data = data->next;
455                 early_memunmap(data, sizeof(*data));
456         }
457 
458         sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
459         memcpy(&e820_saved, &e820, sizeof(struct e820map));
460         printk(KERN_INFO "extended physical RAM map:\n");
461         e820_print_map("reserve setup_data");
462 }
463 
464 static void __init memblock_x86_reserve_range_setup_data(void)
465 {
466         struct setup_data *data;
467         u64 pa_data;
468 
469         pa_data = boot_params.hdr.setup_data;
470         while (pa_data) {
471                 data = early_memremap(pa_data, sizeof(*data));
472                 memblock_reserve(pa_data, sizeof(*data) + data->len);
473                 pa_data = data->next;
474                 early_memunmap(data, sizeof(*data));
475         }
476 }
477 
478 /*
479  * --------- Crashkernel reservation ------------------------------
480  */
481 
482 #ifdef CONFIG_KEXEC_CORE
483 
484 /* 16M alignment for crash kernel regions */
485 #define CRASH_ALIGN             (16 << 20)
486 
487 /*
488  * Keep the crash kernel below this limit.  On 32 bits earlier kernels
489  * would limit the kernel to the low 512 MiB due to mapping restrictions.
490  * On 64bit, old kexec-tools need to under 896MiB.
491  */
492 #ifdef CONFIG_X86_32
493 # define CRASH_ADDR_LOW_MAX     (512 << 20)
494 # define CRASH_ADDR_HIGH_MAX    (512 << 20)
495 #else
496 # define CRASH_ADDR_LOW_MAX     (896UL << 20)
497 # define CRASH_ADDR_HIGH_MAX    MAXMEM
498 #endif
499 
500 static int __init reserve_crashkernel_low(void)
501 {
502 #ifdef CONFIG_X86_64
503         unsigned long long base, low_base = 0, low_size = 0;
504         unsigned long total_low_mem;
505         int ret;
506 
507         total_low_mem = memblock_mem_size(1UL << (32 - PAGE_SHIFT));
508 
509         /* crashkernel=Y,low */
510         ret = parse_crashkernel_low(boot_command_line, total_low_mem, &low_size, &base);
511         if (ret) {
512                 /*
513                  * two parts from lib/swiotlb.c:
514                  * -swiotlb size: user-specified with swiotlb= or default.
515                  *
516                  * -swiotlb overflow buffer: now hardcoded to 32k. We round it
517                  * to 8M for other buffers that may need to stay low too. Also
518                  * make sure we allocate enough extra low memory so that we
519                  * don't run out of DMA buffers for 32-bit devices.
520                  */
521                 low_size = max(swiotlb_size_or_default() + (8UL << 20), 256UL << 20);
522         } else {
523                 /* passed with crashkernel=0,low ? */
524                 if (!low_size)
525                         return 0;
526         }
527 
528         low_base = memblock_find_in_range(low_size, 1ULL << 32, low_size, CRASH_ALIGN);
529         if (!low_base) {
530                 pr_err("Cannot reserve %ldMB crashkernel low memory, please try smaller size.\n",
531                        (unsigned long)(low_size >> 20));
532                 return -ENOMEM;
533         }
534 
535         ret = memblock_reserve(low_base, low_size);
536         if (ret) {
537                 pr_err("%s: Error reserving crashkernel low memblock.\n", __func__);
538                 return ret;
539         }
540 
541         pr_info("Reserving %ldMB of low memory at %ldMB for crashkernel (System low RAM: %ldMB)\n",
542                 (unsigned long)(low_size >> 20),
543                 (unsigned long)(low_base >> 20),
544                 (unsigned long)(total_low_mem >> 20));
545 
546         crashk_low_res.start = low_base;
547         crashk_low_res.end   = low_base + low_size - 1;
548         insert_resource(&iomem_resource, &crashk_low_res);
549 #endif
550         return 0;
551 }
552 
553 static void __init reserve_crashkernel(void)
554 {
555         unsigned long long crash_size, crash_base, total_mem;
556         bool high = false;
557         int ret;
558 
559         total_mem = memblock_phys_mem_size();
560 
561         /* crashkernel=XM */
562         ret = parse_crashkernel(boot_command_line, total_mem, &crash_size, &crash_base);
563         if (ret != 0 || crash_size <= 0) {
564                 /* crashkernel=X,high */
565                 ret = parse_crashkernel_high(boot_command_line, total_mem,
566                                              &crash_size, &crash_base);
567                 if (ret != 0 || crash_size <= 0)
568                         return;
569                 high = true;
570         }
571 
572         /* 0 means: find the address automatically */
573         if (crash_base <= 0) {
574                 /*
575                  *  kexec want bzImage is below CRASH_KERNEL_ADDR_MAX
576                  */
577                 crash_base = memblock_find_in_range(CRASH_ALIGN,
578                                                     high ? CRASH_ADDR_HIGH_MAX
579                                                          : CRASH_ADDR_LOW_MAX,
580                                                     crash_size, CRASH_ALIGN);
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,
591                                                crash_size, 1 << 20);
592                 if (start != crash_base) {
593                         pr_info("crashkernel reservation failed - memory is in use.\n");
594                         return;
595                 }
596         }
597         ret = memblock_reserve(crash_base, crash_size);
598         if (ret) {
599                 pr_err("%s: Error reserving crashkernel memblock.\n", __func__);
600                 return;
601         }
602 
603         if (crash_base >= (1ULL << 32) && reserve_crashkernel_low()) {
604                 memblock_free(crash_base, crash_size);
605                 return;
606         }
607 
608         pr_info("Reserving %ldMB of memory at %ldMB for crashkernel (System RAM: %ldMB)\n",
609                 (unsigned long)(crash_size >> 20),
610                 (unsigned long)(crash_base >> 20),
611                 (unsigned long)(total_mem >> 20));
612 
613         crashk_res.start = crash_base;
614         crashk_res.end   = crash_base + crash_size - 1;
615         insert_resource(&iomem_resource, &crashk_res);
616 }
617 #else
618 static void __init reserve_crashkernel(void)
619 {
620 }
621 #endif
622 
623 static struct resource standard_io_resources[] = {
624         { .name = "dma1", .start = 0x00, .end = 0x1f,
625                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
626         { .name = "pic1", .start = 0x20, .end = 0x21,
627                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
628         { .name = "timer0", .start = 0x40, .end = 0x43,
629                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
630         { .name = "timer1", .start = 0x50, .end = 0x53,
631                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
632         { .name = "keyboard", .start = 0x60, .end = 0x60,
633                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
634         { .name = "keyboard", .start = 0x64, .end = 0x64,
635                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
636         { .name = "dma page reg", .start = 0x80, .end = 0x8f,
637                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
638         { .name = "pic2", .start = 0xa0, .end = 0xa1,
639                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
640         { .name = "dma2", .start = 0xc0, .end = 0xdf,
641                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
642         { .name = "fpu", .start = 0xf0, .end = 0xff,
643                 .flags = IORESOURCE_BUSY | IORESOURCE_IO }
644 };
645 
646 void __init reserve_standard_io_resources(void)
647 {
648         int i;
649 
650         /* request I/O space for devices used on all i[345]86 PCs */
651         for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
652                 request_resource(&ioport_resource, &standard_io_resources[i]);
653 
654 }
655 
656 static __init void reserve_ibft_region(void)
657 {
658         unsigned long addr, size = 0;
659 
660         addr = find_ibft_region(&size);
661 
662         if (size)
663                 memblock_reserve(addr, size);
664 }
665 
666 static bool __init snb_gfx_workaround_needed(void)
667 {
668 #ifdef CONFIG_PCI
669         int i;
670         u16 vendor, devid;
671         static const __initconst u16 snb_ids[] = {
672                 0x0102,
673                 0x0112,
674                 0x0122,
675                 0x0106,
676                 0x0116,
677                 0x0126,
678                 0x010a,
679         };
680 
681         /* Assume no if something weird is going on with PCI */
682         if (!early_pci_allowed())
683                 return false;
684 
685         vendor = read_pci_config_16(0, 2, 0, PCI_VENDOR_ID);
686         if (vendor != 0x8086)
687                 return false;
688 
689         devid = read_pci_config_16(0, 2, 0, PCI_DEVICE_ID);
690         for (i = 0; i < ARRAY_SIZE(snb_ids); i++)
691                 if (devid == snb_ids[i])
692                         return true;
693 #endif
694 
695         return false;
696 }
697 
698 /*
699  * Sandy Bridge graphics has trouble with certain ranges, exclude
700  * them from allocation.
701  */
702 static void __init trim_snb_memory(void)
703 {
704         static const __initconst unsigned long bad_pages[] = {
705                 0x20050000,
706                 0x20110000,
707                 0x20130000,
708                 0x20138000,
709                 0x40004000,
710         };
711         int i;
712 
713         if (!snb_gfx_workaround_needed())
714                 return;
715 
716         printk(KERN_DEBUG "reserving inaccessible SNB gfx pages\n");
717 
718         /*
719          * Reserve all memory below the 1 MB mark that has not
720          * already been reserved.
721          */
722         memblock_reserve(0, 1<<20);
723         
724         for (i = 0; i < ARRAY_SIZE(bad_pages); i++) {
725                 if (memblock_reserve(bad_pages[i], PAGE_SIZE))
726                         printk(KERN_WARNING "failed to reserve 0x%08lx\n",
727                                bad_pages[i]);
728         }
729 }
730 
731 /*
732  * Here we put platform-specific memory range workarounds, i.e.
733  * memory known to be corrupt or otherwise in need to be reserved on
734  * specific platforms.
735  *
736  * If this gets used more widely it could use a real dispatch mechanism.
737  */
738 static void __init trim_platform_memory_ranges(void)
739 {
740         trim_snb_memory();
741 }
742 
743 static void __init trim_bios_range(void)
744 {
745         /*
746          * A special case is the first 4Kb of memory;
747          * This is a BIOS owned area, not kernel ram, but generally
748          * not listed as such in the E820 table.
749          *
750          * This typically reserves additional memory (64KiB by default)
751          * since some BIOSes are known to corrupt low memory.  See the
752          * Kconfig help text for X86_RESERVE_LOW.
753          */
754         e820_update_range(0, PAGE_SIZE, E820_RAM, E820_RESERVED);
755 
756         /*
757          * special case: Some BIOSen report the PC BIOS
758          * area (640->1Mb) as ram even though it is not.
759          * take them out.
760          */
761         e820_remove_range(BIOS_BEGIN, BIOS_END - BIOS_BEGIN, E820_RAM, 1);
762 
763         sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
764 }
765 
766 /* called before trim_bios_range() to spare extra sanitize */
767 static void __init e820_add_kernel_range(void)
768 {
769         u64 start = __pa_symbol(_text);
770         u64 size = __pa_symbol(_end) - start;
771 
772         /*
773          * Complain if .text .data and .bss are not marked as E820_RAM and
774          * attempt to fix it by adding the range. We may have a confused BIOS,
775          * or the user may have used memmap=exactmap or memmap=xxM$yyM to
776          * exclude kernel range. If we really are running on top non-RAM,
777          * we will crash later anyways.
778          */
779         if (e820_all_mapped(start, start + size, E820_RAM))
780                 return;
781 
782         pr_warn(".text .data .bss are not marked as E820_RAM!\n");
783         e820_remove_range(start, size, E820_RAM, 0);
784         e820_add_region(start, size, E820_RAM);
785 }
786 
787 static unsigned reserve_low = CONFIG_X86_RESERVE_LOW << 10;
788 
789 static int __init parse_reservelow(char *p)
790 {
791         unsigned long long size;
792 
793         if (!p)
794                 return -EINVAL;
795 
796         size = memparse(p, &p);
797 
798         if (size < 4096)
799                 size = 4096;
800 
801         if (size > 640*1024)
802                 size = 640*1024;
803 
804         reserve_low = size;
805 
806         return 0;
807 }
808 
809 early_param("reservelow", parse_reservelow);
810 
811 static void __init trim_low_memory_range(void)
812 {
813         memblock_reserve(0, ALIGN(reserve_low, PAGE_SIZE));
814 }
815         
816 /*
817  * Dump out kernel offset information on panic.
818  */
819 static int
820 dump_kernel_offset(struct notifier_block *self, unsigned long v, void *p)
821 {
822         if (kaslr_enabled()) {
823                 pr_emerg("Kernel Offset: 0x%lx from 0x%lx (relocation range: 0x%lx-0x%lx)\n",
824                          kaslr_offset(),
825                          __START_KERNEL,
826                          __START_KERNEL_map,
827                          MODULES_VADDR-1);
828         } else {
829                 pr_emerg("Kernel Offset: disabled\n");
830         }
831 
832         return 0;
833 }
834 
835 /*
836  * Determine if we were loaded by an EFI loader.  If so, then we have also been
837  * passed the efi memmap, systab, etc., so we should use these data structures
838  * for initialization.  Note, the efi init code path is determined by the
839  * global efi_enabled. This allows the same kernel image to be used on existing
840  * systems (with a traditional BIOS) as well as on EFI systems.
841  */
842 /*
843  * setup_arch - architecture-specific boot-time initializations
844  *
845  * Note: On x86_64, fixmaps are ready for use even before this is called.
846  */
847 
848 void __init setup_arch(char **cmdline_p)
849 {
850         memblock_reserve(__pa_symbol(_text),
851                          (unsigned long)__bss_stop - (unsigned long)_text);
852 
853         early_reserve_initrd();
854 
855         /*
856          * At this point everything still needed from the boot loader
857          * or BIOS or kernel text should be early reserved or marked not
858          * RAM in e820. All other memory is free game.
859          */
860 
861 #ifdef CONFIG_X86_32
862         memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
863 
864         /*
865          * copy kernel address range established so far and switch
866          * to the proper swapper page table
867          */
868         clone_pgd_range(swapper_pg_dir     + KERNEL_PGD_BOUNDARY,
869                         initial_page_table + KERNEL_PGD_BOUNDARY,
870                         KERNEL_PGD_PTRS);
871 
872         load_cr3(swapper_pg_dir);
873         /*
874          * Note: Quark X1000 CPUs advertise PGE incorrectly and require
875          * a cr3 based tlb flush, so the following __flush_tlb_all()
876          * will not flush anything because the cpu quirk which clears
877          * X86_FEATURE_PGE has not been invoked yet. Though due to the
878          * load_cr3() above the TLB has been flushed already. The
879          * quirk is invoked before subsequent calls to __flush_tlb_all()
880          * so proper operation is guaranteed.
881          */
882         __flush_tlb_all();
883 #else
884         printk(KERN_INFO "Command line: %s\n", boot_command_line);
885 #endif
886 
887         /*
888          * If we have OLPC OFW, we might end up relocating the fixmap due to
889          * reserve_top(), so do this before touching the ioremap area.
890          */
891         olpc_ofw_detect();
892 
893         early_trap_init();
894         early_cpu_init();
895         early_ioremap_init();
896 
897         setup_olpc_ofw_pgd();
898 
899         ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
900         screen_info = boot_params.screen_info;
901         edid_info = boot_params.edid_info;
902 #ifdef CONFIG_X86_32
903         apm_info.bios = boot_params.apm_bios_info;
904         ist_info = boot_params.ist_info;
905 #endif
906         saved_video_mode = boot_params.hdr.vid_mode;
907         bootloader_type = boot_params.hdr.type_of_loader;
908         if ((bootloader_type >> 4) == 0xe) {
909                 bootloader_type &= 0xf;
910                 bootloader_type |= (boot_params.hdr.ext_loader_type+0x10) << 4;
911         }
912         bootloader_version  = bootloader_type & 0xf;
913         bootloader_version |= boot_params.hdr.ext_loader_ver << 4;
914 
915 #ifdef CONFIG_BLK_DEV_RAM
916         rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
917         rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
918         rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
919 #endif
920 #ifdef CONFIG_EFI
921         if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
922                      EFI32_LOADER_SIGNATURE, 4)) {
923                 set_bit(EFI_BOOT, &efi.flags);
924         } else if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
925                      EFI64_LOADER_SIGNATURE, 4)) {
926                 set_bit(EFI_BOOT, &efi.flags);
927                 set_bit(EFI_64BIT, &efi.flags);
928         }
929 
930         if (efi_enabled(EFI_BOOT))
931                 efi_memblock_x86_reserve_range();
932 #endif
933 
934         x86_init.oem.arch_setup();
935 
936         iomem_resource.end = (1ULL << boot_cpu_data.x86_phys_bits) - 1;
937         setup_memory_map();
938         parse_setup_data();
939 
940         copy_edd();
941 
942         if (!boot_params.hdr.root_flags)
943                 root_mountflags &= ~MS_RDONLY;
944         init_mm.start_code = (unsigned long) _text;
945         init_mm.end_code = (unsigned long) _etext;
946         init_mm.end_data = (unsigned long) _edata;
947         init_mm.brk = _brk_end;
948 
949         mpx_mm_init(&init_mm);
950 
951         code_resource.start = __pa_symbol(_text);
952         code_resource.end = __pa_symbol(_etext)-1;
953         data_resource.start = __pa_symbol(_etext);
954         data_resource.end = __pa_symbol(_edata)-1;
955         bss_resource.start = __pa_symbol(__bss_start);
956         bss_resource.end = __pa_symbol(__bss_stop)-1;
957 
958 #ifdef CONFIG_CMDLINE_BOOL
959 #ifdef CONFIG_CMDLINE_OVERRIDE
960         strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
961 #else
962         if (builtin_cmdline[0]) {
963                 /* append boot loader cmdline to builtin */
964                 strlcat(builtin_cmdline, " ", COMMAND_LINE_SIZE);
965                 strlcat(builtin_cmdline, boot_command_line, COMMAND_LINE_SIZE);
966                 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
967         }
968 #endif
969 #endif
970 
971         strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
972         *cmdline_p = command_line;
973 
974         /*
975          * x86_configure_nx() is called before parse_early_param() to detect
976          * whether hardware doesn't support NX (so that the early EHCI debug
977          * console setup can safely call set_fixmap()). It may then be called
978          * again from within noexec_setup() during parsing early parameters
979          * to honor the respective command line option.
980          */
981         x86_configure_nx();
982 
983         parse_early_param();
984 
985         x86_report_nx();
986 
987         /* after early param, so could get panic from serial */
988         memblock_x86_reserve_range_setup_data();
989 
990         if (acpi_mps_check()) {
991 #ifdef CONFIG_X86_LOCAL_APIC
992                 disable_apic = 1;
993 #endif
994                 setup_clear_cpu_cap(X86_FEATURE_APIC);
995         }
996 
997 #ifdef CONFIG_PCI
998         if (pci_early_dump_regs)
999                 early_dump_pci_devices();
1000 #endif
1001 
1002         /* update the e820_saved too */
1003         e820_reserve_setup_data();
1004         finish_e820_parsing();
1005 
1006         if (efi_enabled(EFI_BOOT))
1007                 efi_init();
1008 
1009         dmi_scan_machine();
1010         dmi_memdev_walk();
1011         dmi_set_dump_stack_arch_desc();
1012 
1013         /*
1014          * VMware detection requires dmi to be available, so this
1015          * needs to be done after dmi_scan_machine, for the BP.
1016          */
1017         init_hypervisor_platform();
1018 
1019         x86_init.resources.probe_roms();
1020 
1021         /* after parse_early_param, so could debug it */
1022         insert_resource(&iomem_resource, &code_resource);
1023         insert_resource(&iomem_resource, &data_resource);
1024         insert_resource(&iomem_resource, &bss_resource);
1025 
1026         e820_add_kernel_range();
1027         trim_bios_range();
1028 #ifdef CONFIG_X86_32
1029         if (ppro_with_ram_bug()) {
1030                 e820_update_range(0x70000000ULL, 0x40000ULL, E820_RAM,
1031                                   E820_RESERVED);
1032                 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
1033                 printk(KERN_INFO "fixed physical RAM map:\n");
1034                 e820_print_map("bad_ppro");
1035         }
1036 #else
1037         early_gart_iommu_check();
1038 #endif
1039 
1040         /*
1041          * partially used pages are not usable - thus
1042          * we are rounding upwards:
1043          */
1044         max_pfn = e820_end_of_ram_pfn();
1045 
1046         /* update e820 for memory not covered by WB MTRRs */
1047         mtrr_bp_init();
1048         if (mtrr_trim_uncached_memory(max_pfn))
1049                 max_pfn = e820_end_of_ram_pfn();
1050 
1051         max_possible_pfn = max_pfn;
1052 
1053 #ifdef CONFIG_X86_32
1054         /* max_low_pfn get updated here */
1055         find_low_pfn_range();
1056 #else
1057         check_x2apic();
1058 
1059         /* How many end-of-memory variables you have, grandma! */
1060         /* need this before calling reserve_initrd */
1061         if (max_pfn > (1UL<<(32 - PAGE_SHIFT)))
1062                 max_low_pfn = e820_end_of_low_ram_pfn();
1063         else
1064                 max_low_pfn = max_pfn;
1065 
1066         high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
1067 #endif
1068 
1069         /*
1070          * Find and reserve possible boot-time SMP configuration:
1071          */
1072         find_smp_config();
1073 
1074         reserve_ibft_region();
1075 
1076         early_alloc_pgt_buf();
1077 
1078         /*
1079          * Need to conclude brk, before memblock_x86_fill()
1080          *  it could use memblock_find_in_range, could overlap with
1081          *  brk area.
1082          */
1083         reserve_brk();
1084 
1085         cleanup_highmap();
1086 
1087         memblock_set_current_limit(ISA_END_ADDRESS);
1088         memblock_x86_fill();
1089 
1090         if (efi_enabled(EFI_BOOT)) {
1091                 efi_fake_memmap();
1092                 efi_find_mirror();
1093         }
1094 
1095         /*
1096          * The EFI specification says that boot service code won't be called
1097          * after ExitBootServices(). This is, in fact, a lie.
1098          */
1099         if (efi_enabled(EFI_MEMMAP))
1100                 efi_reserve_boot_services();
1101 
1102         /* preallocate 4k for mptable mpc */
1103         early_reserve_e820_mpc_new();
1104 
1105 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
1106         setup_bios_corruption_check();
1107 #endif
1108 
1109 #ifdef CONFIG_X86_32
1110         printk(KERN_DEBUG "initial memory mapped: [mem 0x00000000-%#010lx]\n",
1111                         (max_pfn_mapped<<PAGE_SHIFT) - 1);
1112 #endif
1113 
1114         reserve_real_mode();
1115 
1116         trim_platform_memory_ranges();
1117         trim_low_memory_range();
1118 
1119         init_mem_mapping();
1120 
1121         early_trap_pf_init();
1122 
1123         setup_real_mode();
1124 
1125         memblock_set_current_limit(get_max_mapped());
1126 
1127         /*
1128          * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
1129          */
1130 
1131 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
1132         if (init_ohci1394_dma_early)
1133                 init_ohci1394_dma_on_all_controllers();
1134 #endif
1135         /* Allocate bigger log buffer */
1136         setup_log_buf(1);
1137 
1138         reserve_initrd();
1139 
1140 #if defined(CONFIG_ACPI) && defined(CONFIG_BLK_DEV_INITRD)
1141         acpi_initrd_override((void *)initrd_start, initrd_end - initrd_start);
1142 #endif
1143 
1144         vsmp_init();
1145 
1146         io_delay_init();
1147 
1148         /*
1149          * Parse the ACPI tables for possible boot-time SMP configuration.
1150          */
1151         acpi_boot_table_init();
1152 
1153         early_acpi_boot_init();
1154 
1155         initmem_init();
1156         dma_contiguous_reserve(max_pfn_mapped << PAGE_SHIFT);
1157 
1158         /*
1159          * Reserve memory for crash kernel after SRAT is parsed so that it
1160          * won't consume hotpluggable memory.
1161          */
1162         reserve_crashkernel();
1163 
1164         memblock_find_dma_reserve();
1165 
1166 #ifdef CONFIG_KVM_GUEST
1167         kvmclock_init();
1168 #endif
1169 
1170         x86_init.paging.pagetable_init();
1171 
1172         kasan_init();
1173 
1174         if (boot_cpu_data.cpuid_level >= 0) {
1175                 /* A CPU has %cr4 if and only if it has CPUID */
1176                 mmu_cr4_features = __read_cr4();
1177                 if (trampoline_cr4_features)
1178                         *trampoline_cr4_features = mmu_cr4_features;
1179         }
1180 
1181 #ifdef CONFIG_X86_32
1182         /* sync back kernel address range */
1183         clone_pgd_range(initial_page_table + KERNEL_PGD_BOUNDARY,
1184                         swapper_pg_dir     + KERNEL_PGD_BOUNDARY,
1185                         KERNEL_PGD_PTRS);
1186 
1187         /*
1188          * sync back low identity map too.  It is used for example
1189          * in the 32-bit EFI stub.
1190          */
1191         clone_pgd_range(initial_page_table,
1192                         swapper_pg_dir     + KERNEL_PGD_BOUNDARY,
1193                         min(KERNEL_PGD_PTRS, KERNEL_PGD_BOUNDARY));
1194 #endif
1195 
1196         tboot_probe();
1197 
1198         map_vsyscall();
1199 
1200         generic_apic_probe();
1201 
1202         early_quirks();
1203 
1204         /*
1205          * Read APIC and some other early information from ACPI tables.
1206          */
1207         acpi_boot_init();
1208         sfi_init();
1209         x86_dtb_init();
1210 
1211         /*
1212          * get boot-time SMP configuration:
1213          */
1214         if (smp_found_config)
1215                 get_smp_config();
1216 
1217         prefill_possible_map();
1218 
1219         init_cpu_to_node();
1220 
1221         init_apic_mappings();
1222         io_apic_init_mappings();
1223 
1224         kvm_guest_init();
1225 
1226         e820_reserve_resources();
1227         e820_mark_nosave_regions(max_low_pfn);
1228 
1229         x86_init.resources.reserve_resources();
1230 
1231         e820_setup_gap();
1232 
1233 #ifdef CONFIG_VT
1234 #if defined(CONFIG_VGA_CONSOLE)
1235         if (!efi_enabled(EFI_BOOT) || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
1236                 conswitchp = &vga_con;
1237 #elif defined(CONFIG_DUMMY_CONSOLE)
1238         conswitchp = &dummy_con;
1239 #endif
1240 #endif
1241         x86_init.oem.banner();
1242 
1243         x86_init.timers.wallclock_init();
1244 
1245         mcheck_init();
1246 
1247         arch_init_ideal_nops();
1248 
1249         register_refined_jiffies(CLOCK_TICK_RATE);
1250 
1251 #ifdef CONFIG_EFI
1252         if (efi_enabled(EFI_BOOT))
1253                 efi_apply_memmap_quirks();
1254 #endif
1255 }
1256 
1257 #ifdef CONFIG_X86_32
1258 
1259 static struct resource video_ram_resource = {
1260         .name   = "Video RAM area",
1261         .start  = 0xa0000,
1262         .end    = 0xbffff,
1263         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
1264 };
1265 
1266 void __init i386_reserve_resources(void)
1267 {
1268         request_resource(&iomem_resource, &video_ram_resource);
1269         reserve_standard_io_resources();
1270 }
1271 
1272 #endif /* CONFIG_X86_32 */
1273 
1274 static struct notifier_block kernel_offset_notifier = {
1275         .notifier_call = dump_kernel_offset
1276 };
1277 
1278 static int __init register_kernel_offset_dumper(void)
1279 {
1280         atomic_notifier_chain_register(&panic_notifier_list,
1281                                         &kernel_offset_notifier);
1282         return 0;
1283 }
1284 __initcall(register_kernel_offset_dumper);
1285 

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