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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 #include <asm/mmu_context.h>
116 
117 /*
118  * max_low_pfn_mapped: highest direct mapped pfn under 4GB
119  * max_pfn_mapped:     highest direct mapped pfn over 4GB
120  *
121  * The direct mapping only covers E820_RAM regions, so the ranges and gaps are
122  * represented by pfn_mapped
123  */
124 unsigned long max_low_pfn_mapped;
125 unsigned long max_pfn_mapped;
126 
127 #ifdef CONFIG_DMI
128 RESERVE_BRK(dmi_alloc, 65536);
129 #endif
130 
131 
132 static __initdata unsigned long _brk_start = (unsigned long)__brk_base;
133 unsigned long _brk_end = (unsigned long)__brk_base;
134 
135 #ifdef CONFIG_X86_64
136 int default_cpu_present_to_apicid(int mps_cpu)
137 {
138         return __default_cpu_present_to_apicid(mps_cpu);
139 }
140 
141 int default_check_phys_apicid_present(int phys_apicid)
142 {
143         return __default_check_phys_apicid_present(phys_apicid);
144 }
145 #endif
146 
147 struct boot_params boot_params;
148 
149 /*
150  * Machine setup..
151  */
152 static struct resource data_resource = {
153         .name   = "Kernel data",
154         .start  = 0,
155         .end    = 0,
156         .flags  = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM
157 };
158 
159 static struct resource code_resource = {
160         .name   = "Kernel code",
161         .start  = 0,
162         .end    = 0,
163         .flags  = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM
164 };
165 
166 static struct resource bss_resource = {
167         .name   = "Kernel bss",
168         .start  = 0,
169         .end    = 0,
170         .flags  = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM
171 };
172 
173 
174 #ifdef CONFIG_X86_32
175 /* cpu data as detected by the assembly code in head.S */
176 struct cpuinfo_x86 new_cpu_data = {
177         .wp_works_ok = -1,
178 };
179 /* common cpu data for all cpus */
180 struct cpuinfo_x86 boot_cpu_data __read_mostly = {
181         .wp_works_ok = -1,
182 };
183 EXPORT_SYMBOL(boot_cpu_data);
184 
185 unsigned int def_to_bigsmp;
186 
187 /* for MCA, but anyone else can use it if they want */
188 unsigned int machine_id;
189 unsigned int machine_submodel_id;
190 unsigned int BIOS_revision;
191 
192 struct apm_info apm_info;
193 EXPORT_SYMBOL(apm_info);
194 
195 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
196         defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
197 struct ist_info ist_info;
198 EXPORT_SYMBOL(ist_info);
199 #else
200 struct ist_info ist_info;
201 #endif
202 
203 #else
204 struct cpuinfo_x86 boot_cpu_data __read_mostly = {
205         .x86_phys_bits = MAX_PHYSMEM_BITS,
206 };
207 EXPORT_SYMBOL(boot_cpu_data);
208 #endif
209 
210 
211 #if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64)
212 __visible unsigned long mmu_cr4_features;
213 #else
214 __visible unsigned long mmu_cr4_features = X86_CR4_PAE;
215 #endif
216 
217 /* Boot loader ID and version as integers, for the benefit of proc_dointvec */
218 int bootloader_type, bootloader_version;
219 
220 /*
221  * Setup options
222  */
223 struct screen_info screen_info;
224 EXPORT_SYMBOL(screen_info);
225 struct edid_info edid_info;
226 EXPORT_SYMBOL_GPL(edid_info);
227 
228 extern int root_mountflags;
229 
230 unsigned long saved_video_mode;
231 
232 #define RAMDISK_IMAGE_START_MASK        0x07FF
233 #define RAMDISK_PROMPT_FLAG             0x8000
234 #define RAMDISK_LOAD_FLAG               0x4000
235 
236 static char __initdata command_line[COMMAND_LINE_SIZE];
237 #ifdef CONFIG_CMDLINE_BOOL
238 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
239 #endif
240 
241 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
242 struct edd edd;
243 #ifdef CONFIG_EDD_MODULE
244 EXPORT_SYMBOL(edd);
245 #endif
246 /**
247  * copy_edd() - Copy the BIOS EDD information
248  *              from boot_params into a safe place.
249  *
250  */
251 static inline void __init copy_edd(void)
252 {
253      memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer,
254             sizeof(edd.mbr_signature));
255      memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
256      edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
257      edd.edd_info_nr = boot_params.eddbuf_entries;
258 }
259 #else
260 static inline void __init copy_edd(void)
261 {
262 }
263 #endif
264 
265 void * __init extend_brk(size_t size, size_t align)
266 {
267         size_t mask = align - 1;
268         void *ret;
269 
270         BUG_ON(_brk_start == 0);
271         BUG_ON(align & mask);
272 
273         _brk_end = (_brk_end + mask) & ~mask;
274         BUG_ON((char *)(_brk_end + size) > __brk_limit);
275 
276         ret = (void *)_brk_end;
277         _brk_end += size;
278 
279         memset(ret, 0, size);
280 
281         return ret;
282 }
283 
284 #ifdef CONFIG_X86_32
285 static void __init cleanup_highmap(void)
286 {
287 }
288 #endif
289 
290 static void __init reserve_brk(void)
291 {
292         if (_brk_end > _brk_start)
293                 memblock_reserve(__pa_symbol(_brk_start),
294                                  _brk_end - _brk_start);
295 
296         /* Mark brk area as locked down and no longer taking any
297            new allocations */
298         _brk_start = 0;
299 }
300 
301 u64 relocated_ramdisk;
302 
303 #ifdef CONFIG_BLK_DEV_INITRD
304 
305 static u64 __init get_ramdisk_image(void)
306 {
307         u64 ramdisk_image = boot_params.hdr.ramdisk_image;
308 
309         ramdisk_image |= (u64)boot_params.ext_ramdisk_image << 32;
310 
311         return ramdisk_image;
312 }
313 static u64 __init get_ramdisk_size(void)
314 {
315         u64 ramdisk_size = boot_params.hdr.ramdisk_size;
316 
317         ramdisk_size |= (u64)boot_params.ext_ramdisk_size << 32;
318 
319         return ramdisk_size;
320 }
321 
322 static void __init relocate_initrd(void)
323 {
324         /* Assume only end is not page aligned */
325         u64 ramdisk_image = get_ramdisk_image();
326         u64 ramdisk_size  = get_ramdisk_size();
327         u64 area_size     = PAGE_ALIGN(ramdisk_size);
328 
329         /* We need to move the initrd down into directly mapped mem */
330         relocated_ramdisk = memblock_find_in_range(0, PFN_PHYS(max_pfn_mapped),
331                                                    area_size, PAGE_SIZE);
332 
333         if (!relocated_ramdisk)
334                 panic("Cannot find place for new RAMDISK of size %lld\n",
335                       ramdisk_size);
336 
337         /* Note: this includes all the mem currently occupied by
338            the initrd, we rely on that fact to keep the data intact. */
339         memblock_reserve(relocated_ramdisk, area_size);
340         initrd_start = relocated_ramdisk + PAGE_OFFSET;
341         initrd_end   = initrd_start + ramdisk_size;
342         printk(KERN_INFO "Allocated new RAMDISK: [mem %#010llx-%#010llx]\n",
343                relocated_ramdisk, relocated_ramdisk + ramdisk_size - 1);
344 
345         copy_from_early_mem((void *)initrd_start, ramdisk_image, ramdisk_size);
346 
347         printk(KERN_INFO "Move RAMDISK from [mem %#010llx-%#010llx] to"
348                 " [mem %#010llx-%#010llx]\n",
349                 ramdisk_image, ramdisk_image + ramdisk_size - 1,
350                 relocated_ramdisk, relocated_ramdisk + ramdisk_size - 1);
351 }
352 
353 static void __init early_reserve_initrd(void)
354 {
355         /* Assume only end is not page aligned */
356         u64 ramdisk_image = get_ramdisk_image();
357         u64 ramdisk_size  = get_ramdisk_size();
358         u64 ramdisk_end   = PAGE_ALIGN(ramdisk_image + ramdisk_size);
359 
360         if (!boot_params.hdr.type_of_loader ||
361             !ramdisk_image || !ramdisk_size)
362                 return;         /* No initrd provided by bootloader */
363 
364         memblock_reserve(ramdisk_image, ramdisk_end - ramdisk_image);
365 }
366 static void __init reserve_initrd(void)
367 {
368         /* Assume only end is not page aligned */
369         u64 ramdisk_image = get_ramdisk_image();
370         u64 ramdisk_size  = get_ramdisk_size();
371         u64 ramdisk_end   = PAGE_ALIGN(ramdisk_image + ramdisk_size);
372         u64 mapped_size;
373 
374         if (!boot_params.hdr.type_of_loader ||
375             !ramdisk_image || !ramdisk_size)
376                 return;         /* No initrd provided by bootloader */
377 
378         initrd_start = 0;
379 
380         mapped_size = memblock_mem_size(max_pfn_mapped);
381         if (ramdisk_size >= (mapped_size>>1))
382                 panic("initrd too large to handle, "
383                        "disabling initrd (%lld needed, %lld available)\n",
384                        ramdisk_size, mapped_size>>1);
385 
386         printk(KERN_INFO "RAMDISK: [mem %#010llx-%#010llx]\n", ramdisk_image,
387                         ramdisk_end - 1);
388 
389         if (pfn_range_is_mapped(PFN_DOWN(ramdisk_image),
390                                 PFN_DOWN(ramdisk_end))) {
391                 /* All are mapped, easy case */
392                 initrd_start = ramdisk_image + PAGE_OFFSET;
393                 initrd_end = initrd_start + ramdisk_size;
394                 return;
395         }
396 
397         relocate_initrd();
398 
399         memblock_free(ramdisk_image, ramdisk_end - ramdisk_image);
400 }
401 #else
402 static void __init early_reserve_initrd(void)
403 {
404 }
405 static void __init reserve_initrd(void)
406 {
407 }
408 #endif /* CONFIG_BLK_DEV_INITRD */
409 
410 static void __init parse_setup_data(void)
411 {
412         struct setup_data *data;
413         u64 pa_data, pa_next;
414 
415         pa_data = boot_params.hdr.setup_data;
416         while (pa_data) {
417                 u32 data_len, data_type;
418 
419                 data = early_memremap(pa_data, sizeof(*data));
420                 data_len = data->len + sizeof(struct setup_data);
421                 data_type = data->type;
422                 pa_next = data->next;
423                 early_memunmap(data, sizeof(*data));
424 
425                 switch (data_type) {
426                 case SETUP_E820_EXT:
427                         parse_e820_ext(pa_data, data_len);
428                         break;
429                 case SETUP_DTB:
430                         add_dtb(pa_data);
431                         break;
432                 case SETUP_EFI:
433                         parse_efi_setup(pa_data, data_len);
434                         break;
435                 default:
436                         break;
437                 }
438                 pa_data = pa_next;
439         }
440 }
441 
442 static void __init e820_reserve_setup_data(void)
443 {
444         struct setup_data *data;
445         u64 pa_data;
446 
447         pa_data = boot_params.hdr.setup_data;
448         if (!pa_data)
449                 return;
450 
451         while (pa_data) {
452                 data = early_memremap(pa_data, sizeof(*data));
453                 e820_update_range(pa_data, sizeof(*data)+data->len,
454                          E820_RAM, E820_RESERVED_KERN);
455                 pa_data = data->next;
456                 early_memunmap(data, sizeof(*data));
457         }
458 
459         sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
460         memcpy(&e820_saved, &e820, sizeof(struct e820map));
461         printk(KERN_INFO "extended physical RAM map:\n");
462         e820_print_map("reserve setup_data");
463 }
464 
465 static void __init memblock_x86_reserve_range_setup_data(void)
466 {
467         struct setup_data *data;
468         u64 pa_data;
469 
470         pa_data = boot_params.hdr.setup_data;
471         while (pa_data) {
472                 data = early_memremap(pa_data, sizeof(*data));
473                 memblock_reserve(pa_data, sizeof(*data) + data->len);
474                 pa_data = data->next;
475                 early_memunmap(data, sizeof(*data));
476         }
477 }
478 
479 /*
480  * --------- Crashkernel reservation ------------------------------
481  */
482 
483 #ifdef CONFIG_KEXEC_CORE
484 
485 /* 16M alignment for crash kernel regions */
486 #define CRASH_ALIGN             (16 << 20)
487 
488 /*
489  * Keep the crash kernel below this limit.  On 32 bits earlier kernels
490  * would limit the kernel to the low 512 MiB due to mapping restrictions.
491  * On 64bit, old kexec-tools need to under 896MiB.
492  */
493 #ifdef CONFIG_X86_32
494 # define CRASH_ADDR_LOW_MAX     (512 << 20)
495 # define CRASH_ADDR_HIGH_MAX    (512 << 20)
496 #else
497 # define CRASH_ADDR_LOW_MAX     (896UL << 20)
498 # define CRASH_ADDR_HIGH_MAX    MAXMEM
499 #endif
500 
501 static int __init reserve_crashkernel_low(void)
502 {
503 #ifdef CONFIG_X86_64
504         unsigned long long base, low_base = 0, low_size = 0;
505         unsigned long total_low_mem;
506         int ret;
507 
508         total_low_mem = memblock_mem_size(1UL << (32 - PAGE_SHIFT));
509 
510         /* crashkernel=Y,low */
511         ret = parse_crashkernel_low(boot_command_line, total_low_mem, &low_size, &base);
512         if (ret) {
513                 /*
514                  * two parts from lib/swiotlb.c:
515                  * -swiotlb size: user-specified with swiotlb= or default.
516                  *
517                  * -swiotlb overflow buffer: now hardcoded to 32k. We round it
518                  * to 8M for other buffers that may need to stay low too. Also
519                  * make sure we allocate enough extra low memory so that we
520                  * don't run out of DMA buffers for 32-bit devices.
521                  */
522                 low_size = max(swiotlb_size_or_default() + (8UL << 20), 256UL << 20);
523         } else {
524                 /* passed with crashkernel=0,low ? */
525                 if (!low_size)
526                         return 0;
527         }
528 
529         low_base = memblock_find_in_range(low_size, 1ULL << 32, low_size, CRASH_ALIGN);
530         if (!low_base) {
531                 pr_err("Cannot reserve %ldMB crashkernel low memory, please try smaller size.\n",
532                        (unsigned long)(low_size >> 20));
533                 return -ENOMEM;
534         }
535 
536         ret = memblock_reserve(low_base, low_size);
537         if (ret) {
538                 pr_err("%s: Error reserving crashkernel low memblock.\n", __func__);
539                 return ret;
540         }
541 
542         pr_info("Reserving %ldMB of low memory at %ldMB for crashkernel (System low RAM: %ldMB)\n",
543                 (unsigned long)(low_size >> 20),
544                 (unsigned long)(low_base >> 20),
545                 (unsigned long)(total_low_mem >> 20));
546 
547         crashk_low_res.start = low_base;
548         crashk_low_res.end   = low_base + low_size - 1;
549         insert_resource(&iomem_resource, &crashk_low_res);
550 #endif
551         return 0;
552 }
553 
554 static void __init reserve_crashkernel(void)
555 {
556         unsigned long long crash_size, crash_base, total_mem;
557         bool high = false;
558         int ret;
559 
560         total_mem = memblock_phys_mem_size();
561 
562         /* crashkernel=XM */
563         ret = parse_crashkernel(boot_command_line, total_mem, &crash_size, &crash_base);
564         if (ret != 0 || crash_size <= 0) {
565                 /* crashkernel=X,high */
566                 ret = parse_crashkernel_high(boot_command_line, total_mem,
567                                              &crash_size, &crash_base);
568                 if (ret != 0 || crash_size <= 0)
569                         return;
570                 high = true;
571         }
572 
573         /* 0 means: find the address automatically */
574         if (crash_base <= 0) {
575                 /*
576                  *  kexec want bzImage is below CRASH_KERNEL_ADDR_MAX
577                  */
578                 crash_base = memblock_find_in_range(CRASH_ALIGN,
579                                                     high ? CRASH_ADDR_HIGH_MAX
580                                                          : CRASH_ADDR_LOW_MAX,
581                                                     crash_size, CRASH_ALIGN);
582                 if (!crash_base) {
583                         pr_info("crashkernel reservation failed - No suitable area found.\n");
584                         return;
585                 }
586 
587         } else {
588                 unsigned long long start;
589 
590                 start = memblock_find_in_range(crash_base,
591                                                crash_base + crash_size,
592                                                crash_size, 1 << 20);
593                 if (start != crash_base) {
594                         pr_info("crashkernel reservation failed - memory is in use.\n");
595                         return;
596                 }
597         }
598         ret = memblock_reserve(crash_base, crash_size);
599         if (ret) {
600                 pr_err("%s: Error reserving crashkernel memblock.\n", __func__);
601                 return;
602         }
603 
604         if (crash_base >= (1ULL << 32) && reserve_crashkernel_low()) {
605                 memblock_free(crash_base, crash_size);
606                 return;
607         }
608 
609         pr_info("Reserving %ldMB of memory at %ldMB for crashkernel (System RAM: %ldMB)\n",
610                 (unsigned long)(crash_size >> 20),
611                 (unsigned long)(crash_base >> 20),
612                 (unsigned long)(total_mem >> 20));
613 
614         crashk_res.start = crash_base;
615         crashk_res.end   = crash_base + crash_size - 1;
616         insert_resource(&iomem_resource, &crashk_res);
617 }
618 #else
619 static void __init reserve_crashkernel(void)
620 {
621 }
622 #endif
623 
624 static struct resource standard_io_resources[] = {
625         { .name = "dma1", .start = 0x00, .end = 0x1f,
626                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
627         { .name = "pic1", .start = 0x20, .end = 0x21,
628                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
629         { .name = "timer0", .start = 0x40, .end = 0x43,
630                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
631         { .name = "timer1", .start = 0x50, .end = 0x53,
632                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
633         { .name = "keyboard", .start = 0x60, .end = 0x60,
634                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
635         { .name = "keyboard", .start = 0x64, .end = 0x64,
636                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
637         { .name = "dma page reg", .start = 0x80, .end = 0x8f,
638                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
639         { .name = "pic2", .start = 0xa0, .end = 0xa1,
640                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
641         { .name = "dma2", .start = 0xc0, .end = 0xdf,
642                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
643         { .name = "fpu", .start = 0xf0, .end = 0xff,
644                 .flags = IORESOURCE_BUSY | IORESOURCE_IO }
645 };
646 
647 void __init reserve_standard_io_resources(void)
648 {
649         int i;
650 
651         /* request I/O space for devices used on all i[345]86 PCs */
652         for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
653                 request_resource(&ioport_resource, &standard_io_resources[i]);
654 
655 }
656 
657 static __init void reserve_ibft_region(void)
658 {
659         unsigned long addr, size = 0;
660 
661         addr = find_ibft_region(&size);
662 
663         if (size)
664                 memblock_reserve(addr, size);
665 }
666 
667 static bool __init snb_gfx_workaround_needed(void)
668 {
669 #ifdef CONFIG_PCI
670         int i;
671         u16 vendor, devid;
672         static const __initconst u16 snb_ids[] = {
673                 0x0102,
674                 0x0112,
675                 0x0122,
676                 0x0106,
677                 0x0116,
678                 0x0126,
679                 0x010a,
680         };
681 
682         /* Assume no if something weird is going on with PCI */
683         if (!early_pci_allowed())
684                 return false;
685 
686         vendor = read_pci_config_16(0, 2, 0, PCI_VENDOR_ID);
687         if (vendor != 0x8086)
688                 return false;
689 
690         devid = read_pci_config_16(0, 2, 0, PCI_DEVICE_ID);
691         for (i = 0; i < ARRAY_SIZE(snb_ids); i++)
692                 if (devid == snb_ids[i])
693                         return true;
694 #endif
695 
696         return false;
697 }
698 
699 /*
700  * Sandy Bridge graphics has trouble with certain ranges, exclude
701  * them from allocation.
702  */
703 static void __init trim_snb_memory(void)
704 {
705         static const __initconst unsigned long bad_pages[] = {
706                 0x20050000,
707                 0x20110000,
708                 0x20130000,
709                 0x20138000,
710                 0x40004000,
711         };
712         int i;
713 
714         if (!snb_gfx_workaround_needed())
715                 return;
716 
717         printk(KERN_DEBUG "reserving inaccessible SNB gfx pages\n");
718 
719         /*
720          * Reserve all memory below the 1 MB mark that has not
721          * already been reserved.
722          */
723         memblock_reserve(0, 1<<20);
724         
725         for (i = 0; i < ARRAY_SIZE(bad_pages); i++) {
726                 if (memblock_reserve(bad_pages[i], PAGE_SIZE))
727                         printk(KERN_WARNING "failed to reserve 0x%08lx\n",
728                                bad_pages[i]);
729         }
730 }
731 
732 /*
733  * Here we put platform-specific memory range workarounds, i.e.
734  * memory known to be corrupt or otherwise in need to be reserved on
735  * specific platforms.
736  *
737  * If this gets used more widely it could use a real dispatch mechanism.
738  */
739 static void __init trim_platform_memory_ranges(void)
740 {
741         trim_snb_memory();
742 }
743 
744 static void __init trim_bios_range(void)
745 {
746         /*
747          * A special case is the first 4Kb of memory;
748          * This is a BIOS owned area, not kernel ram, but generally
749          * not listed as such in the E820 table.
750          *
751          * This typically reserves additional memory (64KiB by default)
752          * since some BIOSes are known to corrupt low memory.  See the
753          * Kconfig help text for X86_RESERVE_LOW.
754          */
755         e820_update_range(0, PAGE_SIZE, E820_RAM, E820_RESERVED);
756 
757         /*
758          * special case: Some BIOSen report the PC BIOS
759          * area (640->1Mb) as ram even though it is not.
760          * take them out.
761          */
762         e820_remove_range(BIOS_BEGIN, BIOS_END - BIOS_BEGIN, E820_RAM, 1);
763 
764         sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
765 }
766 
767 /* called before trim_bios_range() to spare extra sanitize */
768 static void __init e820_add_kernel_range(void)
769 {
770         u64 start = __pa_symbol(_text);
771         u64 size = __pa_symbol(_end) - start;
772 
773         /*
774          * Complain if .text .data and .bss are not marked as E820_RAM and
775          * attempt to fix it by adding the range. We may have a confused BIOS,
776          * or the user may have used memmap=exactmap or memmap=xxM$yyM to
777          * exclude kernel range. If we really are running on top non-RAM,
778          * we will crash later anyways.
779          */
780         if (e820_all_mapped(start, start + size, E820_RAM))
781                 return;
782 
783         pr_warn(".text .data .bss are not marked as E820_RAM!\n");
784         e820_remove_range(start, size, E820_RAM, 0);
785         e820_add_region(start, size, E820_RAM);
786 }
787 
788 static unsigned reserve_low = CONFIG_X86_RESERVE_LOW << 10;
789 
790 static int __init parse_reservelow(char *p)
791 {
792         unsigned long long size;
793 
794         if (!p)
795                 return -EINVAL;
796 
797         size = memparse(p, &p);
798 
799         if (size < 4096)
800                 size = 4096;
801 
802         if (size > 640*1024)
803                 size = 640*1024;
804 
805         reserve_low = size;
806 
807         return 0;
808 }
809 
810 early_param("reservelow", parse_reservelow);
811 
812 static void __init trim_low_memory_range(void)
813 {
814         memblock_reserve(0, ALIGN(reserve_low, PAGE_SIZE));
815 }
816         
817 /*
818  * Dump out kernel offset information on panic.
819  */
820 static int
821 dump_kernel_offset(struct notifier_block *self, unsigned long v, void *p)
822 {
823         if (kaslr_enabled()) {
824                 pr_emerg("Kernel Offset: 0x%lx from 0x%lx (relocation range: 0x%lx-0x%lx)\n",
825                          kaslr_offset(),
826                          __START_KERNEL,
827                          __START_KERNEL_map,
828                          MODULES_VADDR-1);
829         } else {
830                 pr_emerg("Kernel Offset: disabled\n");
831         }
832 
833         return 0;
834 }
835 
836 /*
837  * Determine if we were loaded by an EFI loader.  If so, then we have also been
838  * passed the efi memmap, systab, etc., so we should use these data structures
839  * for initialization.  Note, the efi init code path is determined by the
840  * global efi_enabled. This allows the same kernel image to be used on existing
841  * systems (with a traditional BIOS) as well as on EFI systems.
842  */
843 /*
844  * setup_arch - architecture-specific boot-time initializations
845  *
846  * Note: On x86_64, fixmaps are ready for use even before this is called.
847  */
848 
849 void __init setup_arch(char **cmdline_p)
850 {
851         memblock_reserve(__pa_symbol(_text),
852                          (unsigned long)__bss_stop - (unsigned long)_text);
853 
854         early_reserve_initrd();
855 
856         /*
857          * At this point everything still needed from the boot loader
858          * or BIOS or kernel text should be early reserved or marked not
859          * RAM in e820. All other memory is free game.
860          */
861 
862 #ifdef CONFIG_X86_32
863         memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
864 
865         /*
866          * copy kernel address range established so far and switch
867          * to the proper swapper page table
868          */
869         clone_pgd_range(swapper_pg_dir     + KERNEL_PGD_BOUNDARY,
870                         initial_page_table + KERNEL_PGD_BOUNDARY,
871                         KERNEL_PGD_PTRS);
872 
873         load_cr3(swapper_pg_dir);
874         /*
875          * Note: Quark X1000 CPUs advertise PGE incorrectly and require
876          * a cr3 based tlb flush, so the following __flush_tlb_all()
877          * will not flush anything because the cpu quirk which clears
878          * X86_FEATURE_PGE has not been invoked yet. Though due to the
879          * load_cr3() above the TLB has been flushed already. The
880          * quirk is invoked before subsequent calls to __flush_tlb_all()
881          * so proper operation is guaranteed.
882          */
883         __flush_tlb_all();
884 #else
885         printk(KERN_INFO "Command line: %s\n", boot_command_line);
886 #endif
887 
888         /*
889          * If we have OLPC OFW, we might end up relocating the fixmap due to
890          * reserve_top(), so do this before touching the ioremap area.
891          */
892         olpc_ofw_detect();
893 
894         early_trap_init();
895         early_cpu_init();
896         early_ioremap_init();
897 
898         setup_olpc_ofw_pgd();
899 
900         ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
901         screen_info = boot_params.screen_info;
902         edid_info = boot_params.edid_info;
903 #ifdef CONFIG_X86_32
904         apm_info.bios = boot_params.apm_bios_info;
905         ist_info = boot_params.ist_info;
906 #endif
907         saved_video_mode = boot_params.hdr.vid_mode;
908         bootloader_type = boot_params.hdr.type_of_loader;
909         if ((bootloader_type >> 4) == 0xe) {
910                 bootloader_type &= 0xf;
911                 bootloader_type |= (boot_params.hdr.ext_loader_type+0x10) << 4;
912         }
913         bootloader_version  = bootloader_type & 0xf;
914         bootloader_version |= boot_params.hdr.ext_loader_ver << 4;
915 
916 #ifdef CONFIG_BLK_DEV_RAM
917         rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
918         rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
919         rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
920 #endif
921 #ifdef CONFIG_EFI
922         if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
923                      EFI32_LOADER_SIGNATURE, 4)) {
924                 set_bit(EFI_BOOT, &efi.flags);
925         } else if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
926                      EFI64_LOADER_SIGNATURE, 4)) {
927                 set_bit(EFI_BOOT, &efi.flags);
928                 set_bit(EFI_64BIT, &efi.flags);
929         }
930 
931         if (efi_enabled(EFI_BOOT))
932                 efi_memblock_x86_reserve_range();
933 #endif
934 
935         x86_init.oem.arch_setup();
936 
937         iomem_resource.end = (1ULL << boot_cpu_data.x86_phys_bits) - 1;
938         setup_memory_map();
939         parse_setup_data();
940 
941         copy_edd();
942 
943         if (!boot_params.hdr.root_flags)
944                 root_mountflags &= ~MS_RDONLY;
945         init_mm.start_code = (unsigned long) _text;
946         init_mm.end_code = (unsigned long) _etext;
947         init_mm.end_data = (unsigned long) _edata;
948         init_mm.brk = _brk_end;
949 
950         mpx_mm_init(&init_mm);
951 
952         code_resource.start = __pa_symbol(_text);
953         code_resource.end = __pa_symbol(_etext)-1;
954         data_resource.start = __pa_symbol(_etext);
955         data_resource.end = __pa_symbol(_edata)-1;
956         bss_resource.start = __pa_symbol(__bss_start);
957         bss_resource.end = __pa_symbol(__bss_stop)-1;
958 
959 #ifdef CONFIG_CMDLINE_BOOL
960 #ifdef CONFIG_CMDLINE_OVERRIDE
961         strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
962 #else
963         if (builtin_cmdline[0]) {
964                 /* append boot loader cmdline to builtin */
965                 strlcat(builtin_cmdline, " ", COMMAND_LINE_SIZE);
966                 strlcat(builtin_cmdline, boot_command_line, COMMAND_LINE_SIZE);
967                 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
968         }
969 #endif
970 #endif
971 
972         strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
973         *cmdline_p = command_line;
974 
975         /*
976          * x86_configure_nx() is called before parse_early_param() to detect
977          * whether hardware doesn't support NX (so that the early EHCI debug
978          * console setup can safely call set_fixmap()). It may then be called
979          * again from within noexec_setup() during parsing early parameters
980          * to honor the respective command line option.
981          */
982         x86_configure_nx();
983 
984         parse_early_param();
985 
986         x86_report_nx();
987 
988         /* after early param, so could get panic from serial */
989         memblock_x86_reserve_range_setup_data();
990 
991         if (acpi_mps_check()) {
992 #ifdef CONFIG_X86_LOCAL_APIC
993                 disable_apic = 1;
994 #endif
995                 setup_clear_cpu_cap(X86_FEATURE_APIC);
996         }
997 
998 #ifdef CONFIG_PCI
999         if (pci_early_dump_regs)
1000                 early_dump_pci_devices();
1001 #endif
1002 
1003         /* update the e820_saved too */
1004         e820_reserve_setup_data();
1005         finish_e820_parsing();
1006 
1007         if (efi_enabled(EFI_BOOT))
1008                 efi_init();
1009 
1010         dmi_scan_machine();
1011         dmi_memdev_walk();
1012         dmi_set_dump_stack_arch_desc();
1013 
1014         /*
1015          * VMware detection requires dmi to be available, so this
1016          * needs to be done after dmi_scan_machine, for the BP.
1017          */
1018         init_hypervisor_platform();
1019 
1020         x86_init.resources.probe_roms();
1021 
1022         /* after parse_early_param, so could debug it */
1023         insert_resource(&iomem_resource, &code_resource);
1024         insert_resource(&iomem_resource, &data_resource);
1025         insert_resource(&iomem_resource, &bss_resource);
1026 
1027         e820_add_kernel_range();
1028         trim_bios_range();
1029 #ifdef CONFIG_X86_32
1030         if (ppro_with_ram_bug()) {
1031                 e820_update_range(0x70000000ULL, 0x40000ULL, E820_RAM,
1032                                   E820_RESERVED);
1033                 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
1034                 printk(KERN_INFO "fixed physical RAM map:\n");
1035                 e820_print_map("bad_ppro");
1036         }
1037 #else
1038         early_gart_iommu_check();
1039 #endif
1040 
1041         /*
1042          * partially used pages are not usable - thus
1043          * we are rounding upwards:
1044          */
1045         max_pfn = e820_end_of_ram_pfn();
1046 
1047         /* update e820 for memory not covered by WB MTRRs */
1048         mtrr_bp_init();
1049         if (mtrr_trim_uncached_memory(max_pfn))
1050                 max_pfn = e820_end_of_ram_pfn();
1051 
1052         max_possible_pfn = max_pfn;
1053 
1054 #ifdef CONFIG_X86_32
1055         /* max_low_pfn get updated here */
1056         find_low_pfn_range();
1057 #else
1058         check_x2apic();
1059 
1060         /* How many end-of-memory variables you have, grandma! */
1061         /* need this before calling reserve_initrd */
1062         if (max_pfn > (1UL<<(32 - PAGE_SHIFT)))
1063                 max_low_pfn = e820_end_of_low_ram_pfn();
1064         else
1065                 max_low_pfn = max_pfn;
1066 
1067         high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
1068 #endif
1069 
1070         /*
1071          * Find and reserve possible boot-time SMP configuration:
1072          */
1073         find_smp_config();
1074 
1075         reserve_ibft_region();
1076 
1077         early_alloc_pgt_buf();
1078 
1079         /*
1080          * Need to conclude brk, before memblock_x86_fill()
1081          *  it could use memblock_find_in_range, could overlap with
1082          *  brk area.
1083          */
1084         reserve_brk();
1085 
1086         cleanup_highmap();
1087 
1088         memblock_set_current_limit(ISA_END_ADDRESS);
1089         memblock_x86_fill();
1090 
1091         if (efi_enabled(EFI_BOOT)) {
1092                 efi_fake_memmap();
1093                 efi_find_mirror();
1094         }
1095 
1096         /*
1097          * The EFI specification says that boot service code won't be called
1098          * after ExitBootServices(). This is, in fact, a lie.
1099          */
1100         if (efi_enabled(EFI_MEMMAP))
1101                 efi_reserve_boot_services();
1102 
1103         /* preallocate 4k for mptable mpc */
1104         early_reserve_e820_mpc_new();
1105 
1106 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
1107         setup_bios_corruption_check();
1108 #endif
1109 
1110 #ifdef CONFIG_X86_32
1111         printk(KERN_DEBUG "initial memory mapped: [mem 0x00000000-%#010lx]\n",
1112                         (max_pfn_mapped<<PAGE_SHIFT) - 1);
1113 #endif
1114 
1115         reserve_real_mode();
1116 
1117         trim_platform_memory_ranges();
1118         trim_low_memory_range();
1119 
1120         init_mem_mapping();
1121 
1122         early_trap_pf_init();
1123 
1124         setup_real_mode();
1125 
1126         memblock_set_current_limit(get_max_mapped());
1127 
1128         /*
1129          * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
1130          */
1131 
1132 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
1133         if (init_ohci1394_dma_early)
1134                 init_ohci1394_dma_on_all_controllers();
1135 #endif
1136         /* Allocate bigger log buffer */
1137         setup_log_buf(1);
1138 
1139         reserve_initrd();
1140 
1141 #if defined(CONFIG_ACPI) && defined(CONFIG_BLK_DEV_INITRD)
1142         acpi_initrd_override((void *)initrd_start, initrd_end - initrd_start);
1143 #endif
1144 
1145         vsmp_init();
1146 
1147         io_delay_init();
1148 
1149         /*
1150          * Parse the ACPI tables for possible boot-time SMP configuration.
1151          */
1152         acpi_boot_table_init();
1153 
1154         early_acpi_boot_init();
1155 
1156         initmem_init();
1157         dma_contiguous_reserve(max_pfn_mapped << PAGE_SHIFT);
1158 
1159         /*
1160          * Reserve memory for crash kernel after SRAT is parsed so that it
1161          * won't consume hotpluggable memory.
1162          */
1163         reserve_crashkernel();
1164 
1165         memblock_find_dma_reserve();
1166 
1167 #ifdef CONFIG_KVM_GUEST
1168         kvmclock_init();
1169 #endif
1170 
1171         x86_init.paging.pagetable_init();
1172 
1173         kasan_init();
1174 
1175         if (boot_cpu_data.cpuid_level >= 0) {
1176                 /* A CPU has %cr4 if and only if it has CPUID */
1177                 mmu_cr4_features = __read_cr4();
1178                 if (trampoline_cr4_features)
1179                         *trampoline_cr4_features = mmu_cr4_features;
1180         }
1181 
1182 #ifdef CONFIG_X86_32
1183         /* sync back kernel address range */
1184         clone_pgd_range(initial_page_table + KERNEL_PGD_BOUNDARY,
1185                         swapper_pg_dir     + KERNEL_PGD_BOUNDARY,
1186                         KERNEL_PGD_PTRS);
1187 
1188         /*
1189          * sync back low identity map too.  It is used for example
1190          * in the 32-bit EFI stub.
1191          */
1192         clone_pgd_range(initial_page_table,
1193                         swapper_pg_dir     + KERNEL_PGD_BOUNDARY,
1194                         min(KERNEL_PGD_PTRS, KERNEL_PGD_BOUNDARY));
1195 #endif
1196 
1197         tboot_probe();
1198 
1199         map_vsyscall();
1200 
1201         generic_apic_probe();
1202 
1203         early_quirks();
1204 
1205         /*
1206          * Read APIC and some other early information from ACPI tables.
1207          */
1208         acpi_boot_init();
1209         sfi_init();
1210         x86_dtb_init();
1211 
1212         /*
1213          * get boot-time SMP configuration:
1214          */
1215         if (smp_found_config)
1216                 get_smp_config();
1217 
1218         prefill_possible_map();
1219 
1220         init_cpu_to_node();
1221 
1222         init_apic_mappings();
1223         io_apic_init_mappings();
1224 
1225         kvm_guest_init();
1226 
1227         e820_reserve_resources();
1228         e820_mark_nosave_regions(max_low_pfn);
1229 
1230         x86_init.resources.reserve_resources();
1231 
1232         e820_setup_gap();
1233 
1234 #ifdef CONFIG_VT
1235 #if defined(CONFIG_VGA_CONSOLE)
1236         if (!efi_enabled(EFI_BOOT) || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
1237                 conswitchp = &vga_con;
1238 #elif defined(CONFIG_DUMMY_CONSOLE)
1239         conswitchp = &dummy_con;
1240 #endif
1241 #endif
1242         x86_init.oem.banner();
1243 
1244         x86_init.timers.wallclock_init();
1245 
1246         mcheck_init();
1247 
1248         arch_init_ideal_nops();
1249 
1250         register_refined_jiffies(CLOCK_TICK_RATE);
1251 
1252 #ifdef CONFIG_EFI
1253         if (efi_enabled(EFI_BOOT))
1254                 efi_apply_memmap_quirks();
1255 #endif
1256 }
1257 
1258 #ifdef CONFIG_X86_32
1259 
1260 static struct resource video_ram_resource = {
1261         .name   = "Video RAM area",
1262         .start  = 0xa0000,
1263         .end    = 0xbffff,
1264         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
1265 };
1266 
1267 void __init i386_reserve_resources(void)
1268 {
1269         request_resource(&iomem_resource, &video_ram_resource);
1270         reserve_standard_io_resources();
1271 }
1272 
1273 #endif /* CONFIG_X86_32 */
1274 
1275 static struct notifier_block kernel_offset_notifier = {
1276         .notifier_call = dump_kernel_offset
1277 };
1278 
1279 static int __init register_kernel_offset_dumper(void)
1280 {
1281         atomic_notifier_chain_register(&panic_notifier_list,
1282                                         &kernel_offset_notifier);
1283         return 0;
1284 }
1285 __initcall(register_kernel_offset_dumper);
1286 
1287 void arch_show_smap(struct seq_file *m, struct vm_area_struct *vma)
1288 {
1289         if (!boot_cpu_has(X86_FEATURE_OSPKE))
1290                 return;
1291 
1292         seq_printf(m, "ProtectionKey:  %8u\n", vma_pkey(vma));
1293 }
1294 

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