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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/export.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 #include <asm/mmu_context.h>
116 #include <asm/kaslr.h>
117 
118 /*
119  * max_low_pfn_mapped: highest direct mapped pfn under 4GB
120  * max_pfn_mapped:     highest direct mapped pfn over 4GB
121  *
122  * The direct mapping only covers E820_RAM regions, so the ranges and gaps are
123  * represented by pfn_mapped
124  */
125 unsigned long max_low_pfn_mapped;
126 unsigned long max_pfn_mapped;
127 
128 #ifdef CONFIG_DMI
129 RESERVE_BRK(dmi_alloc, 65536);
130 #endif
131 
132 
133 static __initdata unsigned long _brk_start = (unsigned long)__brk_base;
134 unsigned long _brk_end = (unsigned long)__brk_base;
135 
136 #ifdef CONFIG_X86_64
137 int default_cpu_present_to_apicid(int mps_cpu)
138 {
139         return __default_cpu_present_to_apicid(mps_cpu);
140 }
141 
142 int default_check_phys_apicid_present(int phys_apicid)
143 {
144         return __default_check_phys_apicid_present(phys_apicid);
145 }
146 #endif
147 
148 struct boot_params boot_params;
149 
150 /*
151  * Machine setup..
152  */
153 static struct resource data_resource = {
154         .name   = "Kernel data",
155         .start  = 0,
156         .end    = 0,
157         .flags  = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM
158 };
159 
160 static struct resource code_resource = {
161         .name   = "Kernel code",
162         .start  = 0,
163         .end    = 0,
164         .flags  = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM
165 };
166 
167 static struct resource bss_resource = {
168         .name   = "Kernel bss",
169         .start  = 0,
170         .end    = 0,
171         .flags  = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM
172 };
173 
174 
175 #ifdef CONFIG_X86_32
176 /* cpu data as detected by the assembly code in head.S */
177 struct cpuinfo_x86 new_cpu_data = {
178         .wp_works_ok = -1,
179 };
180 /* common cpu data for all cpus */
181 struct cpuinfo_x86 boot_cpu_data __read_mostly = {
182         .wp_works_ok = -1,
183 };
184 EXPORT_SYMBOL(boot_cpu_data);
185 
186 unsigned int def_to_bigsmp;
187 
188 /* for MCA, but anyone else can use it if they want */
189 unsigned int machine_id;
190 unsigned int machine_submodel_id;
191 unsigned int BIOS_revision;
192 
193 struct apm_info apm_info;
194 EXPORT_SYMBOL(apm_info);
195 
196 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
197         defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
198 struct ist_info ist_info;
199 EXPORT_SYMBOL(ist_info);
200 #else
201 struct ist_info ist_info;
202 #endif
203 
204 #else
205 struct cpuinfo_x86 boot_cpu_data __read_mostly = {
206         .x86_phys_bits = MAX_PHYSMEM_BITS,
207 };
208 EXPORT_SYMBOL(boot_cpu_data);
209 #endif
210 
211 
212 #if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64)
213 __visible unsigned long mmu_cr4_features;
214 #else
215 __visible unsigned long mmu_cr4_features = X86_CR4_PAE;
216 #endif
217 
218 /* Boot loader ID and version as integers, for the benefit of proc_dointvec */
219 int bootloader_type, bootloader_version;
220 
221 /*
222  * Setup options
223  */
224 struct screen_info screen_info;
225 EXPORT_SYMBOL(screen_info);
226 struct edid_info edid_info;
227 EXPORT_SYMBOL_GPL(edid_info);
228 
229 extern int root_mountflags;
230 
231 unsigned long saved_video_mode;
232 
233 #define RAMDISK_IMAGE_START_MASK        0x07FF
234 #define RAMDISK_PROMPT_FLAG             0x8000
235 #define RAMDISK_LOAD_FLAG               0x4000
236 
237 static char __initdata command_line[COMMAND_LINE_SIZE];
238 #ifdef CONFIG_CMDLINE_BOOL
239 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
240 #endif
241 
242 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
243 struct edd edd;
244 #ifdef CONFIG_EDD_MODULE
245 EXPORT_SYMBOL(edd);
246 #endif
247 /**
248  * copy_edd() - Copy the BIOS EDD information
249  *              from boot_params into a safe place.
250  *
251  */
252 static inline void __init copy_edd(void)
253 {
254      memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer,
255             sizeof(edd.mbr_signature));
256      memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
257      edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
258      edd.edd_info_nr = boot_params.eddbuf_entries;
259 }
260 #else
261 static inline void __init copy_edd(void)
262 {
263 }
264 #endif
265 
266 void * __init extend_brk(size_t size, size_t align)
267 {
268         size_t mask = align - 1;
269         void *ret;
270 
271         BUG_ON(_brk_start == 0);
272         BUG_ON(align & mask);
273 
274         _brk_end = (_brk_end + mask) & ~mask;
275         BUG_ON((char *)(_brk_end + size) > __brk_limit);
276 
277         ret = (void *)_brk_end;
278         _brk_end += size;
279 
280         memset(ret, 0, size);
281 
282         return ret;
283 }
284 
285 #ifdef CONFIG_X86_32
286 static void __init cleanup_highmap(void)
287 {
288 }
289 #endif
290 
291 static void __init reserve_brk(void)
292 {
293         if (_brk_end > _brk_start)
294                 memblock_reserve(__pa_symbol(_brk_start),
295                                  _brk_end - _brk_start);
296 
297         /* Mark brk area as locked down and no longer taking any
298            new allocations */
299         _brk_start = 0;
300 }
301 
302 u64 relocated_ramdisk;
303 
304 #ifdef CONFIG_BLK_DEV_INITRD
305 
306 static u64 __init get_ramdisk_image(void)
307 {
308         u64 ramdisk_image = boot_params.hdr.ramdisk_image;
309 
310         ramdisk_image |= (u64)boot_params.ext_ramdisk_image << 32;
311 
312         return ramdisk_image;
313 }
314 static u64 __init get_ramdisk_size(void)
315 {
316         u64 ramdisk_size = boot_params.hdr.ramdisk_size;
317 
318         ramdisk_size |= (u64)boot_params.ext_ramdisk_size << 32;
319 
320         return ramdisk_size;
321 }
322 
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 
330         /* We need to move the initrd down into directly mapped mem */
331         relocated_ramdisk = memblock_find_in_range(0, PFN_PHYS(max_pfn_mapped),
332                                                    area_size, PAGE_SIZE);
333 
334         if (!relocated_ramdisk)
335                 panic("Cannot find place for new RAMDISK of size %lld\n",
336                       ramdisk_size);
337 
338         /* Note: this includes all the mem currently occupied by
339            the initrd, we rely on that fact to keep the data intact. */
340         memblock_reserve(relocated_ramdisk, area_size);
341         initrd_start = relocated_ramdisk + PAGE_OFFSET;
342         initrd_end   = initrd_start + ramdisk_size;
343         printk(KERN_INFO "Allocated new RAMDISK: [mem %#010llx-%#010llx]\n",
344                relocated_ramdisk, relocated_ramdisk + ramdisk_size - 1);
345 
346         copy_from_early_mem((void *)initrd_start, ramdisk_image, ramdisk_size);
347 
348         printk(KERN_INFO "Move RAMDISK from [mem %#010llx-%#010llx] to"
349                 " [mem %#010llx-%#010llx]\n",
350                 ramdisk_image, ramdisk_image + ramdisk_size - 1,
351                 relocated_ramdisk, relocated_ramdisk + ramdisk_size - 1);
352 }
353 
354 static void __init early_reserve_initrd(void)
355 {
356         /* Assume only end is not page aligned */
357         u64 ramdisk_image = get_ramdisk_image();
358         u64 ramdisk_size  = get_ramdisk_size();
359         u64 ramdisk_end   = PAGE_ALIGN(ramdisk_image + ramdisk_size);
360 
361         if (!boot_params.hdr.type_of_loader ||
362             !ramdisk_image || !ramdisk_size)
363                 return;         /* No initrd provided by bootloader */
364 
365         memblock_reserve(ramdisk_image, ramdisk_end - ramdisk_image);
366 }
367 static void __init reserve_initrd(void)
368 {
369         /* Assume only end is not page aligned */
370         u64 ramdisk_image = get_ramdisk_image();
371         u64 ramdisk_size  = get_ramdisk_size();
372         u64 ramdisk_end   = PAGE_ALIGN(ramdisk_image + ramdisk_size);
373         u64 mapped_size;
374 
375         if (!boot_params.hdr.type_of_loader ||
376             !ramdisk_image || !ramdisk_size)
377                 return;         /* No initrd provided by bootloader */
378 
379         initrd_start = 0;
380 
381         mapped_size = memblock_mem_size(max_pfn_mapped);
382         if (ramdisk_size >= (mapped_size>>1))
383                 panic("initrd too large to handle, "
384                        "disabling initrd (%lld needed, %lld available)\n",
385                        ramdisk_size, mapped_size>>1);
386 
387         printk(KERN_INFO "RAMDISK: [mem %#010llx-%#010llx]\n", ramdisk_image,
388                         ramdisk_end - 1);
389 
390         if (pfn_range_is_mapped(PFN_DOWN(ramdisk_image),
391                                 PFN_DOWN(ramdisk_end))) {
392                 /* All are mapped, easy case */
393                 initrd_start = ramdisk_image + PAGE_OFFSET;
394                 initrd_end = initrd_start + ramdisk_size;
395                 return;
396         }
397 
398         relocate_initrd();
399 
400         memblock_free(ramdisk_image, ramdisk_end - ramdisk_image);
401 }
402 
403 #else
404 static void __init early_reserve_initrd(void)
405 {
406 }
407 static void __init reserve_initrd(void)
408 {
409 }
410 #endif /* CONFIG_BLK_DEV_INITRD */
411 
412 static void __init parse_setup_data(void)
413 {
414         struct setup_data *data;
415         u64 pa_data, pa_next;
416 
417         pa_data = boot_params.hdr.setup_data;
418         while (pa_data) {
419                 u32 data_len, data_type;
420 
421                 data = early_memremap(pa_data, sizeof(*data));
422                 data_len = data->len + sizeof(struct setup_data);
423                 data_type = data->type;
424                 pa_next = data->next;
425                 early_memunmap(data, sizeof(*data));
426 
427                 switch (data_type) {
428                 case SETUP_E820_EXT:
429                         parse_e820_ext(pa_data, data_len);
430                         break;
431                 case SETUP_DTB:
432                         add_dtb(pa_data);
433                         break;
434                 case SETUP_EFI:
435                         parse_efi_setup(pa_data, data_len);
436                         break;
437                 default:
438                         break;
439                 }
440                 pa_data = pa_next;
441         }
442 }
443 
444 static void __init e820_reserve_setup_data(void)
445 {
446         struct setup_data *data;
447         u64 pa_data;
448 
449         pa_data = boot_params.hdr.setup_data;
450         if (!pa_data)
451                 return;
452 
453         while (pa_data) {
454                 data = early_memremap(pa_data, sizeof(*data));
455                 e820_update_range(pa_data, sizeof(*data)+data->len,
456                          E820_RAM, E820_RESERVED_KERN);
457                 pa_data = data->next;
458                 early_memunmap(data, sizeof(*data));
459         }
460 
461         sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
462         memcpy(&e820_saved, &e820, sizeof(struct e820map));
463         printk(KERN_INFO "extended physical RAM map:\n");
464         e820_print_map("reserve setup_data");
465 }
466 
467 static void __init memblock_x86_reserve_range_setup_data(void)
468 {
469         struct setup_data *data;
470         u64 pa_data;
471 
472         pa_data = boot_params.hdr.setup_data;
473         while (pa_data) {
474                 data = early_memremap(pa_data, sizeof(*data));
475                 memblock_reserve(pa_data, sizeof(*data) + data->len);
476                 pa_data = data->next;
477                 early_memunmap(data, sizeof(*data));
478         }
479 }
480 
481 /*
482  * --------- Crashkernel reservation ------------------------------
483  */
484 
485 #ifdef CONFIG_KEXEC_CORE
486 
487 /* 16M alignment for crash kernel regions */
488 #define CRASH_ALIGN             (16 << 20)
489 
490 /*
491  * Keep the crash kernel below this limit.  On 32 bits earlier kernels
492  * would limit the kernel to the low 512 MiB due to mapping restrictions.
493  * On 64bit, old kexec-tools need to under 896MiB.
494  */
495 #ifdef CONFIG_X86_32
496 # define CRASH_ADDR_LOW_MAX     (512 << 20)
497 # define CRASH_ADDR_HIGH_MAX    (512 << 20)
498 #else
499 # define CRASH_ADDR_LOW_MAX     (896UL << 20)
500 # define CRASH_ADDR_HIGH_MAX    MAXMEM
501 #endif
502 
503 static int __init reserve_crashkernel_low(void)
504 {
505 #ifdef CONFIG_X86_64
506         unsigned long long base, low_base = 0, low_size = 0;
507         unsigned long total_low_mem;
508         int ret;
509 
510         total_low_mem = memblock_mem_size(1UL << (32 - PAGE_SHIFT));
511 
512         /* crashkernel=Y,low */
513         ret = parse_crashkernel_low(boot_command_line, total_low_mem, &low_size, &base);
514         if (ret) {
515                 /*
516                  * two parts from lib/swiotlb.c:
517                  * -swiotlb size: user-specified with swiotlb= or default.
518                  *
519                  * -swiotlb overflow buffer: now hardcoded to 32k. We round it
520                  * to 8M for other buffers that may need to stay low too. Also
521                  * make sure we allocate enough extra low memory so that we
522                  * don't run out of DMA buffers for 32-bit devices.
523                  */
524                 low_size = max(swiotlb_size_or_default() + (8UL << 20), 256UL << 20);
525         } else {
526                 /* passed with crashkernel=0,low ? */
527                 if (!low_size)
528                         return 0;
529         }
530 
531         low_base = memblock_find_in_range(low_size, 1ULL << 32, low_size, CRASH_ALIGN);
532         if (!low_base) {
533                 pr_err("Cannot reserve %ldMB crashkernel low memory, please try smaller size.\n",
534                        (unsigned long)(low_size >> 20));
535                 return -ENOMEM;
536         }
537 
538         ret = memblock_reserve(low_base, low_size);
539         if (ret) {
540                 pr_err("%s: Error reserving crashkernel low memblock.\n", __func__);
541                 return ret;
542         }
543 
544         pr_info("Reserving %ldMB of low memory at %ldMB for crashkernel (System low RAM: %ldMB)\n",
545                 (unsigned long)(low_size >> 20),
546                 (unsigned long)(low_base >> 20),
547                 (unsigned long)(total_low_mem >> 20));
548 
549         crashk_low_res.start = low_base;
550         crashk_low_res.end   = low_base + low_size - 1;
551         insert_resource(&iomem_resource, &crashk_low_res);
552 #endif
553         return 0;
554 }
555 
556 static void __init reserve_crashkernel(void)
557 {
558         unsigned long long crash_size, crash_base, total_mem;
559         bool high = false;
560         int ret;
561 
562         total_mem = memblock_phys_mem_size();
563 
564         /* crashkernel=XM */
565         ret = parse_crashkernel(boot_command_line, total_mem, &crash_size, &crash_base);
566         if (ret != 0 || crash_size <= 0) {
567                 /* crashkernel=X,high */
568                 ret = parse_crashkernel_high(boot_command_line, total_mem,
569                                              &crash_size, &crash_base);
570                 if (ret != 0 || crash_size <= 0)
571                         return;
572                 high = true;
573         }
574 
575         /* 0 means: find the address automatically */
576         if (crash_base <= 0) {
577                 /*
578                  *  kexec want bzImage is below CRASH_KERNEL_ADDR_MAX
579                  */
580                 crash_base = memblock_find_in_range(CRASH_ALIGN,
581                                                     high ? CRASH_ADDR_HIGH_MAX
582                                                          : CRASH_ADDR_LOW_MAX,
583                                                     crash_size, CRASH_ALIGN);
584                 if (!crash_base) {
585                         pr_info("crashkernel reservation failed - No suitable area found.\n");
586                         return;
587                 }
588 
589         } else {
590                 unsigned long long start;
591 
592                 start = memblock_find_in_range(crash_base,
593                                                crash_base + crash_size,
594                                                crash_size, 1 << 20);
595                 if (start != crash_base) {
596                         pr_info("crashkernel reservation failed - memory is in use.\n");
597                         return;
598                 }
599         }
600         ret = memblock_reserve(crash_base, crash_size);
601         if (ret) {
602                 pr_err("%s: Error reserving crashkernel memblock.\n", __func__);
603                 return;
604         }
605 
606         if (crash_base >= (1ULL << 32) && reserve_crashkernel_low()) {
607                 memblock_free(crash_base, crash_size);
608                 return;
609         }
610 
611         pr_info("Reserving %ldMB of memory at %ldMB for crashkernel (System RAM: %ldMB)\n",
612                 (unsigned long)(crash_size >> 20),
613                 (unsigned long)(crash_base >> 20),
614                 (unsigned long)(total_mem >> 20));
615 
616         crashk_res.start = crash_base;
617         crashk_res.end   = crash_base + crash_size - 1;
618         insert_resource(&iomem_resource, &crashk_res);
619 }
620 #else
621 static void __init reserve_crashkernel(void)
622 {
623 }
624 #endif
625 
626 static struct resource standard_io_resources[] = {
627         { .name = "dma1", .start = 0x00, .end = 0x1f,
628                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
629         { .name = "pic1", .start = 0x20, .end = 0x21,
630                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
631         { .name = "timer0", .start = 0x40, .end = 0x43,
632                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
633         { .name = "timer1", .start = 0x50, .end = 0x53,
634                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
635         { .name = "keyboard", .start = 0x60, .end = 0x60,
636                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
637         { .name = "keyboard", .start = 0x64, .end = 0x64,
638                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
639         { .name = "dma page reg", .start = 0x80, .end = 0x8f,
640                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
641         { .name = "pic2", .start = 0xa0, .end = 0xa1,
642                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
643         { .name = "dma2", .start = 0xc0, .end = 0xdf,
644                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
645         { .name = "fpu", .start = 0xf0, .end = 0xff,
646                 .flags = IORESOURCE_BUSY | IORESOURCE_IO }
647 };
648 
649 void __init reserve_standard_io_resources(void)
650 {
651         int i;
652 
653         /* request I/O space for devices used on all i[345]86 PCs */
654         for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
655                 request_resource(&ioport_resource, &standard_io_resources[i]);
656 
657 }
658 
659 static __init void reserve_ibft_region(void)
660 {
661         unsigned long addr, size = 0;
662 
663         addr = find_ibft_region(&size);
664 
665         if (size)
666                 memblock_reserve(addr, size);
667 }
668 
669 static bool __init snb_gfx_workaround_needed(void)
670 {
671 #ifdef CONFIG_PCI
672         int i;
673         u16 vendor, devid;
674         static const __initconst u16 snb_ids[] = {
675                 0x0102,
676                 0x0112,
677                 0x0122,
678                 0x0106,
679                 0x0116,
680                 0x0126,
681                 0x010a,
682         };
683 
684         /* Assume no if something weird is going on with PCI */
685         if (!early_pci_allowed())
686                 return false;
687 
688         vendor = read_pci_config_16(0, 2, 0, PCI_VENDOR_ID);
689         if (vendor != 0x8086)
690                 return false;
691 
692         devid = read_pci_config_16(0, 2, 0, PCI_DEVICE_ID);
693         for (i = 0; i < ARRAY_SIZE(snb_ids); i++)
694                 if (devid == snb_ids[i])
695                         return true;
696 #endif
697 
698         return false;
699 }
700 
701 /*
702  * Sandy Bridge graphics has trouble with certain ranges, exclude
703  * them from allocation.
704  */
705 static void __init trim_snb_memory(void)
706 {
707         static const __initconst unsigned long bad_pages[] = {
708                 0x20050000,
709                 0x20110000,
710                 0x20130000,
711                 0x20138000,
712                 0x40004000,
713         };
714         int i;
715 
716         if (!snb_gfx_workaround_needed())
717                 return;
718 
719         printk(KERN_DEBUG "reserving inaccessible SNB gfx pages\n");
720 
721         /*
722          * Reserve all memory below the 1 MB mark that has not
723          * already been reserved.
724          */
725         memblock_reserve(0, 1<<20);
726         
727         for (i = 0; i < ARRAY_SIZE(bad_pages); i++) {
728                 if (memblock_reserve(bad_pages[i], PAGE_SIZE))
729                         printk(KERN_WARNING "failed to reserve 0x%08lx\n",
730                                bad_pages[i]);
731         }
732 }
733 
734 /*
735  * Here we put platform-specific memory range workarounds, i.e.
736  * memory known to be corrupt or otherwise in need to be reserved on
737  * specific platforms.
738  *
739  * If this gets used more widely it could use a real dispatch mechanism.
740  */
741 static void __init trim_platform_memory_ranges(void)
742 {
743         trim_snb_memory();
744 }
745 
746 static void __init trim_bios_range(void)
747 {
748         /*
749          * A special case is the first 4Kb of memory;
750          * This is a BIOS owned area, not kernel ram, but generally
751          * not listed as such in the E820 table.
752          *
753          * This typically reserves additional memory (64KiB by default)
754          * since some BIOSes are known to corrupt low memory.  See the
755          * Kconfig help text for X86_RESERVE_LOW.
756          */
757         e820_update_range(0, PAGE_SIZE, E820_RAM, E820_RESERVED);
758 
759         /*
760          * special case: Some BIOSen report the PC BIOS
761          * area (640->1Mb) as ram even though it is not.
762          * take them out.
763          */
764         e820_remove_range(BIOS_BEGIN, BIOS_END - BIOS_BEGIN, E820_RAM, 1);
765 
766         sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
767 }
768 
769 /* called before trim_bios_range() to spare extra sanitize */
770 static void __init e820_add_kernel_range(void)
771 {
772         u64 start = __pa_symbol(_text);
773         u64 size = __pa_symbol(_end) - start;
774 
775         /*
776          * Complain if .text .data and .bss are not marked as E820_RAM and
777          * attempt to fix it by adding the range. We may have a confused BIOS,
778          * or the user may have used memmap=exactmap or memmap=xxM$yyM to
779          * exclude kernel range. If we really are running on top non-RAM,
780          * we will crash later anyways.
781          */
782         if (e820_all_mapped(start, start + size, E820_RAM))
783                 return;
784 
785         pr_warn(".text .data .bss are not marked as E820_RAM!\n");
786         e820_remove_range(start, size, E820_RAM, 0);
787         e820_add_region(start, size, E820_RAM);
788 }
789 
790 static unsigned reserve_low = CONFIG_X86_RESERVE_LOW << 10;
791 
792 static int __init parse_reservelow(char *p)
793 {
794         unsigned long long size;
795 
796         if (!p)
797                 return -EINVAL;
798 
799         size = memparse(p, &p);
800 
801         if (size < 4096)
802                 size = 4096;
803 
804         if (size > 640*1024)
805                 size = 640*1024;
806 
807         reserve_low = size;
808 
809         return 0;
810 }
811 
812 early_param("reservelow", parse_reservelow);
813 
814 static void __init trim_low_memory_range(void)
815 {
816         memblock_reserve(0, ALIGN(reserve_low, PAGE_SIZE));
817 }
818         
819 /*
820  * Dump out kernel offset information on panic.
821  */
822 static int
823 dump_kernel_offset(struct notifier_block *self, unsigned long v, void *p)
824 {
825         if (kaslr_enabled()) {
826                 pr_emerg("Kernel Offset: 0x%lx from 0x%lx (relocation range: 0x%lx-0x%lx)\n",
827                          kaslr_offset(),
828                          __START_KERNEL,
829                          __START_KERNEL_map,
830                          MODULES_VADDR-1);
831         } else {
832                 pr_emerg("Kernel Offset: disabled\n");
833         }
834 
835         return 0;
836 }
837 
838 /*
839  * Determine if we were loaded by an EFI loader.  If so, then we have also been
840  * passed the efi memmap, systab, etc., so we should use these data structures
841  * for initialization.  Note, the efi init code path is determined by the
842  * global efi_enabled. This allows the same kernel image to be used on existing
843  * systems (with a traditional BIOS) as well as on EFI systems.
844  */
845 /*
846  * setup_arch - architecture-specific boot-time initializations
847  *
848  * Note: On x86_64, fixmaps are ready for use even before this is called.
849  */
850 
851 void __init setup_arch(char **cmdline_p)
852 {
853         memblock_reserve(__pa_symbol(_text),
854                          (unsigned long)__bss_stop - (unsigned long)_text);
855 
856         early_reserve_initrd();
857 
858         /*
859          * At this point everything still needed from the boot loader
860          * or BIOS or kernel text should be early reserved or marked not
861          * RAM in e820. All other memory is free game.
862          */
863 
864 #ifdef CONFIG_X86_32
865         memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
866 
867         /*
868          * copy kernel address range established so far and switch
869          * to the proper swapper page table
870          */
871         clone_pgd_range(swapper_pg_dir     + KERNEL_PGD_BOUNDARY,
872                         initial_page_table + KERNEL_PGD_BOUNDARY,
873                         KERNEL_PGD_PTRS);
874 
875         load_cr3(swapper_pg_dir);
876         /*
877          * Note: Quark X1000 CPUs advertise PGE incorrectly and require
878          * a cr3 based tlb flush, so the following __flush_tlb_all()
879          * will not flush anything because the cpu quirk which clears
880          * X86_FEATURE_PGE has not been invoked yet. Though due to the
881          * load_cr3() above the TLB has been flushed already. The
882          * quirk is invoked before subsequent calls to __flush_tlb_all()
883          * so proper operation is guaranteed.
884          */
885         __flush_tlb_all();
886 #else
887         printk(KERN_INFO "Command line: %s\n", boot_command_line);
888 #endif
889 
890         /*
891          * If we have OLPC OFW, we might end up relocating the fixmap due to
892          * reserve_top(), so do this before touching the ioremap area.
893          */
894         olpc_ofw_detect();
895 
896         early_trap_init();
897         early_cpu_init();
898         early_ioremap_init();
899 
900         setup_olpc_ofw_pgd();
901 
902         ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
903         screen_info = boot_params.screen_info;
904         edid_info = boot_params.edid_info;
905 #ifdef CONFIG_X86_32
906         apm_info.bios = boot_params.apm_bios_info;
907         ist_info = boot_params.ist_info;
908 #endif
909         saved_video_mode = boot_params.hdr.vid_mode;
910         bootloader_type = boot_params.hdr.type_of_loader;
911         if ((bootloader_type >> 4) == 0xe) {
912                 bootloader_type &= 0xf;
913                 bootloader_type |= (boot_params.hdr.ext_loader_type+0x10) << 4;
914         }
915         bootloader_version  = bootloader_type & 0xf;
916         bootloader_version |= boot_params.hdr.ext_loader_ver << 4;
917 
918 #ifdef CONFIG_BLK_DEV_RAM
919         rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
920         rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
921         rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
922 #endif
923 #ifdef CONFIG_EFI
924         if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
925                      EFI32_LOADER_SIGNATURE, 4)) {
926                 set_bit(EFI_BOOT, &efi.flags);
927         } else if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
928                      EFI64_LOADER_SIGNATURE, 4)) {
929                 set_bit(EFI_BOOT, &efi.flags);
930                 set_bit(EFI_64BIT, &efi.flags);
931         }
932 
933         if (efi_enabled(EFI_BOOT))
934                 efi_memblock_x86_reserve_range();
935 #endif
936 
937         x86_init.oem.arch_setup();
938 
939         iomem_resource.end = (1ULL << boot_cpu_data.x86_phys_bits) - 1;
940         setup_memory_map();
941         parse_setup_data();
942 
943         copy_edd();
944 
945         if (!boot_params.hdr.root_flags)
946                 root_mountflags &= ~MS_RDONLY;
947         init_mm.start_code = (unsigned long) _text;
948         init_mm.end_code = (unsigned long) _etext;
949         init_mm.end_data = (unsigned long) _edata;
950         init_mm.brk = _brk_end;
951 
952         mpx_mm_init(&init_mm);
953 
954         code_resource.start = __pa_symbol(_text);
955         code_resource.end = __pa_symbol(_etext)-1;
956         data_resource.start = __pa_symbol(_etext);
957         data_resource.end = __pa_symbol(_edata)-1;
958         bss_resource.start = __pa_symbol(__bss_start);
959         bss_resource.end = __pa_symbol(__bss_stop)-1;
960 
961 #ifdef CONFIG_CMDLINE_BOOL
962 #ifdef CONFIG_CMDLINE_OVERRIDE
963         strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
964 #else
965         if (builtin_cmdline[0]) {
966                 /* append boot loader cmdline to builtin */
967                 strlcat(builtin_cmdline, " ", COMMAND_LINE_SIZE);
968                 strlcat(builtin_cmdline, boot_command_line, COMMAND_LINE_SIZE);
969                 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
970         }
971 #endif
972 #endif
973 
974         strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
975         *cmdline_p = command_line;
976 
977         /*
978          * x86_configure_nx() is called before parse_early_param() to detect
979          * whether hardware doesn't support NX (so that the early EHCI debug
980          * console setup can safely call set_fixmap()). It may then be called
981          * again from within noexec_setup() during parsing early parameters
982          * to honor the respective command line option.
983          */
984         x86_configure_nx();
985 
986         parse_early_param();
987 
988         x86_report_nx();
989 
990         /* after early param, so could get panic from serial */
991         memblock_x86_reserve_range_setup_data();
992 
993         if (acpi_mps_check()) {
994 #ifdef CONFIG_X86_LOCAL_APIC
995                 disable_apic = 1;
996 #endif
997                 setup_clear_cpu_cap(X86_FEATURE_APIC);
998         }
999 
1000 #ifdef CONFIG_PCI
1001         if (pci_early_dump_regs)
1002                 early_dump_pci_devices();
1003 #endif
1004 
1005         /* update the e820_saved too */
1006         e820_reserve_setup_data();
1007         finish_e820_parsing();
1008 
1009         if (efi_enabled(EFI_BOOT))
1010                 efi_init();
1011 
1012         dmi_scan_machine();
1013         dmi_memdev_walk();
1014         dmi_set_dump_stack_arch_desc();
1015 
1016         /*
1017          * VMware detection requires dmi to be available, so this
1018          * needs to be done after dmi_scan_machine, for the BP.
1019          */
1020         init_hypervisor_platform();
1021 
1022         x86_init.resources.probe_roms();
1023 
1024         /* after parse_early_param, so could debug it */
1025         insert_resource(&iomem_resource, &code_resource);
1026         insert_resource(&iomem_resource, &data_resource);
1027         insert_resource(&iomem_resource, &bss_resource);
1028 
1029         e820_add_kernel_range();
1030         trim_bios_range();
1031 #ifdef CONFIG_X86_32
1032         if (ppro_with_ram_bug()) {
1033                 e820_update_range(0x70000000ULL, 0x40000ULL, E820_RAM,
1034                                   E820_RESERVED);
1035                 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
1036                 printk(KERN_INFO "fixed physical RAM map:\n");
1037                 e820_print_map("bad_ppro");
1038         }
1039 #else
1040         early_gart_iommu_check();
1041 #endif
1042 
1043         /*
1044          * partially used pages are not usable - thus
1045          * we are rounding upwards:
1046          */
1047         max_pfn = e820_end_of_ram_pfn();
1048 
1049         /* update e820 for memory not covered by WB MTRRs */
1050         mtrr_bp_init();
1051         if (mtrr_trim_uncached_memory(max_pfn))
1052                 max_pfn = e820_end_of_ram_pfn();
1053 
1054         max_possible_pfn = max_pfn;
1055 
1056         /*
1057          * Define random base addresses for memory sections after max_pfn is
1058          * defined and before each memory section base is used.
1059          */
1060         kernel_randomize_memory();
1061 
1062 #ifdef CONFIG_X86_32
1063         /* max_low_pfn get updated here */
1064         find_low_pfn_range();
1065 #else
1066         check_x2apic();
1067 
1068         /* How many end-of-memory variables you have, grandma! */
1069         /* need this before calling reserve_initrd */
1070         if (max_pfn > (1UL<<(32 - PAGE_SHIFT)))
1071                 max_low_pfn = e820_end_of_low_ram_pfn();
1072         else
1073                 max_low_pfn = max_pfn;
1074 
1075         high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
1076 #endif
1077 
1078         /*
1079          * Find and reserve possible boot-time SMP configuration:
1080          */
1081         find_smp_config();
1082 
1083         reserve_ibft_region();
1084 
1085         early_alloc_pgt_buf();
1086 
1087         /*
1088          * Need to conclude brk, before memblock_x86_fill()
1089          *  it could use memblock_find_in_range, could overlap with
1090          *  brk area.
1091          */
1092         reserve_brk();
1093 
1094         cleanup_highmap();
1095 
1096         memblock_set_current_limit(ISA_END_ADDRESS);
1097         memblock_x86_fill();
1098 
1099         if (efi_enabled(EFI_BOOT)) {
1100                 efi_fake_memmap();
1101                 efi_find_mirror();
1102         }
1103 
1104         reserve_bios_regions();
1105 
1106         /*
1107          * The EFI specification says that boot service code won't be called
1108          * after ExitBootServices(). This is, in fact, a lie.
1109          */
1110         if (efi_enabled(EFI_MEMMAP))
1111                 efi_reserve_boot_services();
1112 
1113         /* preallocate 4k for mptable mpc */
1114         early_reserve_e820_mpc_new();
1115 
1116 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
1117         setup_bios_corruption_check();
1118 #endif
1119 
1120 #ifdef CONFIG_X86_32
1121         printk(KERN_DEBUG "initial memory mapped: [mem 0x00000000-%#010lx]\n",
1122                         (max_pfn_mapped<<PAGE_SHIFT) - 1);
1123 #endif
1124 
1125         reserve_real_mode();
1126 
1127         trim_platform_memory_ranges();
1128         trim_low_memory_range();
1129 
1130         init_mem_mapping();
1131 
1132         early_trap_pf_init();
1133 
1134         /*
1135          * Update mmu_cr4_features (and, indirectly, trampoline_cr4_features)
1136          * with the current CR4 value.  This may not be necessary, but
1137          * auditing all the early-boot CR4 manipulation would be needed to
1138          * rule it out.
1139          */
1140         mmu_cr4_features = __read_cr4_safe();
1141 
1142         memblock_set_current_limit(get_max_mapped());
1143 
1144         /*
1145          * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
1146          */
1147 
1148 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
1149         if (init_ohci1394_dma_early)
1150                 init_ohci1394_dma_on_all_controllers();
1151 #endif
1152         /* Allocate bigger log buffer */
1153         setup_log_buf(1);
1154 
1155         reserve_initrd();
1156 
1157         acpi_table_upgrade();
1158 
1159         vsmp_init();
1160 
1161         io_delay_init();
1162 
1163         /*
1164          * Parse the ACPI tables for possible boot-time SMP configuration.
1165          */
1166         acpi_boot_table_init();
1167 
1168         early_acpi_boot_init();
1169 
1170         initmem_init();
1171         dma_contiguous_reserve(max_pfn_mapped << PAGE_SHIFT);
1172 
1173         /*
1174          * Reserve memory for crash kernel after SRAT is parsed so that it
1175          * won't consume hotpluggable memory.
1176          */
1177         reserve_crashkernel();
1178 
1179         memblock_find_dma_reserve();
1180 
1181 #ifdef CONFIG_KVM_GUEST
1182         kvmclock_init();
1183 #endif
1184 
1185         x86_init.paging.pagetable_init();
1186 
1187         kasan_init();
1188 
1189 #ifdef CONFIG_X86_32
1190         /* sync back kernel address range */
1191         clone_pgd_range(initial_page_table + KERNEL_PGD_BOUNDARY,
1192                         swapper_pg_dir     + KERNEL_PGD_BOUNDARY,
1193                         KERNEL_PGD_PTRS);
1194 
1195         /*
1196          * sync back low identity map too.  It is used for example
1197          * in the 32-bit EFI stub.
1198          */
1199         clone_pgd_range(initial_page_table,
1200                         swapper_pg_dir     + KERNEL_PGD_BOUNDARY,
1201                         min(KERNEL_PGD_PTRS, KERNEL_PGD_BOUNDARY));
1202 #endif
1203 
1204         tboot_probe();
1205 
1206         map_vsyscall();
1207 
1208         generic_apic_probe();
1209 
1210         early_quirks();
1211 
1212         /*
1213          * Read APIC and some other early information from ACPI tables.
1214          */
1215         acpi_boot_init();
1216         sfi_init();
1217         x86_dtb_init();
1218 
1219         /*
1220          * get boot-time SMP configuration:
1221          */
1222         if (smp_found_config)
1223                 get_smp_config();
1224 
1225         prefill_possible_map();
1226 
1227         init_cpu_to_node();
1228 
1229         init_apic_mappings();
1230         io_apic_init_mappings();
1231 
1232         kvm_guest_init();
1233 
1234         e820_reserve_resources();
1235         e820_mark_nosave_regions(max_low_pfn);
1236 
1237         x86_init.resources.reserve_resources();
1238 
1239         e820_setup_gap();
1240 
1241 #ifdef CONFIG_VT
1242 #if defined(CONFIG_VGA_CONSOLE)
1243         if (!efi_enabled(EFI_BOOT) || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
1244                 conswitchp = &vga_con;
1245 #elif defined(CONFIG_DUMMY_CONSOLE)
1246         conswitchp = &dummy_con;
1247 #endif
1248 #endif
1249         x86_init.oem.banner();
1250 
1251         x86_init.timers.wallclock_init();
1252 
1253         mcheck_init();
1254 
1255         arch_init_ideal_nops();
1256 
1257         register_refined_jiffies(CLOCK_TICK_RATE);
1258 
1259 #ifdef CONFIG_EFI
1260         if (efi_enabled(EFI_BOOT))
1261                 efi_apply_memmap_quirks();
1262 #endif
1263 }
1264 
1265 #ifdef CONFIG_X86_32
1266 
1267 static struct resource video_ram_resource = {
1268         .name   = "Video RAM area",
1269         .start  = 0xa0000,
1270         .end    = 0xbffff,
1271         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
1272 };
1273 
1274 void __init i386_reserve_resources(void)
1275 {
1276         request_resource(&iomem_resource, &video_ram_resource);
1277         reserve_standard_io_resources();
1278 }
1279 
1280 #endif /* CONFIG_X86_32 */
1281 
1282 static struct notifier_block kernel_offset_notifier = {
1283         .notifier_call = dump_kernel_offset
1284 };
1285 
1286 static int __init register_kernel_offset_dumper(void)
1287 {
1288         atomic_notifier_chain_register(&panic_notifier_list,
1289                                         &kernel_offset_notifier);
1290         return 0;
1291 }
1292 __initcall(register_kernel_offset_dumper);
1293 
1294 void arch_show_smap(struct seq_file *m, struct vm_area_struct *vma)
1295 {
1296         if (!boot_cpu_has(X86_FEATURE_OSPKE))
1297                 return;
1298 
1299         seq_printf(m, "ProtectionKey:  %8u\n", vma_pkey(vma));
1300 }
1301 

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