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 #include <linux/mem_encrypt.h>
  73
  74 #include <linux/usb/xhci-dbgp.h>
  75 #include <video/edid.h>
  76
  77 #include <asm/mtrr.h>
  78 #include <asm/apic.h>
  79 #include <asm/realmode.h>
  80 #include <asm/e820/api.h>
  81 #include <asm/mpspec.h>
  82 #include <asm/setup.h>
  83 #include <asm/efi.h>
  84 #include <asm/timer.h>
  85 #include <asm/i8259.h>
  86 #include <asm/sections.h>
  87 #include <asm/io_apic.h>
  88 #include <asm/ist.h>
  89 #include <asm/setup_arch.h>
  90 #include <asm/bios_ebda.h>
  91 #include <asm/cacheflush.h>
  92 #include <asm/processor.h>
  93 #include <asm/bugs.h>
  94 #include <asm/kasan.h>
  95
  96 #include <asm/vsyscall.h>
  97 #include <asm/cpu.h>
  98 #include <asm/desc.h>
  99 #include <asm/dma.h>
 100 #include <asm/iommu.h>
 101 #include <asm/gart.h>
 102 #include <asm/mmu_context.h>
 103 #include <asm/proto.h>
 104
 105 #include <asm/paravirt.h>
 106 #include <asm/hypervisor.h>
 107 #include <asm/olpc_ofw.h>
 108
 109 #include <asm/percpu.h>
 110 #include <asm/topology.h>
 111 #include <asm/apicdef.h>
 112 #include <asm/amd_nb.h>
 113 #include <asm/mce.h>
 114 #include <asm/alternative.h>
 115 #include <asm/prom.h>
 116 #include <asm/microcode.h>
 117 #include <asm/kaslr.h>
 118 #include <asm/unwind.h>
 119
 120 /*
 121  * max_low_pfn_mapped: highest direct mapped pfn under 4GB
 122  * max_pfn_mapped:     highest direct mapped pfn over 4GB
 123  *
 124  * The direct mapping only covers E820_TYPE_RAM regions, so the ranges and gaps are
 125  * represented by pfn_mapped
 126  */
 127 unsigned long max_low_pfn_mapped;
 128 unsigned long max_pfn_mapped;
 129
 130 #ifdef CONFIG_DMI
 131 RESERVE_BRK(dmi_alloc, 65536);
 132 #endif
 133
 134
 135 static __initdata unsigned long _brk_start = (unsigned long)__brk_base;
 136 unsigned long _brk_end = (unsigned long)__brk_base;
 137
 138 struct boot_params boot_params;
 139
 140 /*
 141  * Machine setup..
 142  */
 143 static struct resource data_resource = {
 144         .name   = "Kernel data",
 145         .start  = 0,
 146         .end    = 0,
 147         .flags  = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM
 148 };
 149
 150 static struct resource code_resource = {
 151         .name   = "Kernel code",
 152         .start  = 0,
 153         .end    = 0,
 154         .flags  = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM
 155 };
 156
 157 static struct resource bss_resource = {
 158         .name   = "Kernel bss",
 159         .start  = 0,
 160         .end    = 0,
 161         .flags  = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM
 162 };
 163
 164
 165 #ifdef CONFIG_X86_32
 166 /* cpu data as detected by the assembly code in head_32.S */
 167 struct cpuinfo_x86 new_cpu_data;
 168
 169 /* common cpu data for all cpus */
 170 struct cpuinfo_x86 boot_cpu_data __read_mostly;
 171 EXPORT_SYMBOL(boot_cpu_data);
 172
 173 unsigned int def_to_bigsmp;
 174
 175 /* for MCA, but anyone else can use it if they want */
 176 unsigned int machine_id;
 177 unsigned int machine_submodel_id;
 178 unsigned int BIOS_revision;
 179
 180 struct apm_info apm_info;
 181 EXPORT_SYMBOL(apm_info);
 182
 183 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
 184         defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
 185 struct ist_info ist_info;
 186 EXPORT_SYMBOL(ist_info);
 187 #else
 188 struct ist_info ist_info;
 189 #endif
 190
 191 #else
 192 struct cpuinfo_x86 boot_cpu_data __read_mostly = {
 193         .x86_phys_bits = MAX_PHYSMEM_BITS,
 194 };
 195 EXPORT_SYMBOL(boot_cpu_data);
 196 #endif
 197
 198
 199 #if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64)
 200 __visible unsigned long mmu_cr4_features __ro_after_init;
 201 #else
 202 __visible unsigned long mmu_cr4_features __ro_after_init = X86_CR4_PAE;
 203 #endif
 204
 205 /* Boot loader ID and version as integers, for the benefit of proc_dointvec */
 206 int bootloader_type, bootloader_version;
 207
 208 /*
 209  * Setup options
 210  */
 211 struct screen_info screen_info;
 212 EXPORT_SYMBOL(screen_info);
 213 struct edid_info edid_info;
 214 EXPORT_SYMBOL_GPL(edid_info);
 215
 216 extern int root_mountflags;
 217
 218 unsigned long saved_video_mode;
 219
 220 #define RAMDISK_IMAGE_START_MASK        0x07FF
 221 #define RAMDISK_PROMPT_FLAG             0x8000
 222 #define RAMDISK_LOAD_FLAG               0x4000
 223
 224 static char __initdata command_line[COMMAND_LINE_SIZE];
 225 #ifdef CONFIG_CMDLINE_BOOL
 226 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
 227 #endif
 228
 229 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
 230 struct edd edd;
 231 #ifdef CONFIG_EDD_MODULE
 232 EXPORT_SYMBOL(edd);
 233 #endif
 234 /**
 235  * copy_edd() - Copy the BIOS EDD information
 236  *              from boot_params into a safe place.
 237  *
 238  */
 239 static inline void __init copy_edd(void)
 240 {
 241      memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer,
 242             sizeof(edd.mbr_signature));
 243      memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
 244      edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
 245      edd.edd_info_nr = boot_params.eddbuf_entries;
 246 }
 247 #else
 248 static inline void __init copy_edd(void)
 249 {
 250 }
 251 #endif
 252
 253 void * __init extend_brk(size_t size, size_t align)
 254 {
 255         size_t mask = align - 1;
 256         void *ret;
 257
 258         BUG_ON(_brk_start == 0);
 259         BUG_ON(align & mask);
 260
 261         _brk_end = (_brk_end + mask) & ~mask;
 262         BUG_ON((char *)(_brk_end + size) > __brk_limit);
 263
 264         ret = (void *)_brk_end;
 265         _brk_end += size;
 266
 267         memset(ret, 0, size);
 268
 269         return ret;
 270 }
 271
 272 #ifdef CONFIG_X86_32
 273 static void __init cleanup_highmap(void)
 274 {
 275 }
 276 #endif
 277
 278 static void __init reserve_brk(void)
 279 {
 280         if (_brk_end > _brk_start)
 281                 memblock_reserve(__pa_symbol(_brk_start),
 282                                  _brk_end - _brk_start);
 283
 284         /* Mark brk area as locked down and no longer taking any
 285            new allocations */
 286         _brk_start = 0;
 287 }
 288
 289 u64 relocated_ramdisk;
 290
 291 #ifdef CONFIG_BLK_DEV_INITRD
 292
 293 static u64 __init get_ramdisk_image(void)
 294 {
 295         u64 ramdisk_image = boot_params.hdr.ramdisk_image;
 296
 297         ramdisk_image |= (u64)boot_params.ext_ramdisk_image << 32;
 298
 299         return ramdisk_image;
 300 }
 301 static u64 __init get_ramdisk_size(void)
 302 {
 303         u64 ramdisk_size = boot_params.hdr.ramdisk_size;
 304
 305         ramdisk_size |= (u64)boot_params.ext_ramdisk_size << 32;
 306
 307         return ramdisk_size;
 308 }
 309
 310 static void __init relocate_initrd(void)
 311 {
 312         /* Assume only end is not page aligned */
 313         u64 ramdisk_image = get_ramdisk_image();
 314         u64 ramdisk_size  = get_ramdisk_size();
 315         u64 area_size     = PAGE_ALIGN(ramdisk_size);
 316
 317         /* We need to move the initrd down into directly mapped mem */
 318         relocated_ramdisk = memblock_find_in_range(0, PFN_PHYS(max_pfn_mapped),
 319                                                    area_size, PAGE_SIZE);
 320
 321         if (!relocated_ramdisk)
 322                 panic("Cannot find place for new RAMDISK of size %lld\n",
 323                       ramdisk_size);
 324
 325         /* Note: this includes all the mem currently occupied by
 326            the initrd, we rely on that fact to keep the data intact. */
 327         memblock_reserve(relocated_ramdisk, area_size);
 328         initrd_start = relocated_ramdisk + PAGE_OFFSET;
 329         initrd_end   = initrd_start + ramdisk_size;
 330         printk(KERN_INFO "Allocated new RAMDISK: [mem %#010llx-%#010llx]\n",
 331                relocated_ramdisk, relocated_ramdisk + ramdisk_size - 1);
 332
 333         copy_from_early_mem((void *)initrd_start, ramdisk_image, ramdisk_size);
 334
 335         printk(KERN_INFO "Move RAMDISK from [mem %#010llx-%#010llx] to"
 336                 " [mem %#010llx-%#010llx]\n",
 337                 ramdisk_image, ramdisk_image + ramdisk_size - 1,
 338                 relocated_ramdisk, relocated_ramdisk + ramdisk_size - 1);
 339 }
 340
 341 static void __init early_reserve_initrd(void)
 342 {
 343         /* Assume only end is not page aligned */
 344         u64 ramdisk_image = get_ramdisk_image();
 345         u64 ramdisk_size  = get_ramdisk_size();
 346         u64 ramdisk_end   = PAGE_ALIGN(ramdisk_image + ramdisk_size);
 347
 348         if (!boot_params.hdr.type_of_loader ||
 349             !ramdisk_image || !ramdisk_size)
 350                 return;         /* No initrd provided by bootloader */
 351
 352         memblock_reserve(ramdisk_image, ramdisk_end - ramdisk_image);
 353 }
 354 static void __init 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         u64 mapped_size;
 361
 362         if (!boot_params.hdr.type_of_loader ||
 363             !ramdisk_image || !ramdisk_size)
 364                 return;         /* No initrd provided by bootloader */
 365
 366         initrd_start = 0;
 367
 368         mapped_size = memblock_mem_size(max_pfn_mapped);
 369         if (ramdisk_size >= (mapped_size>>1))
 370                 panic("initrd too large to handle, "
 371                        "disabling initrd (%lld needed, %lld available)\n",
 372                        ramdisk_size, mapped_size>>1);
 373
 374         printk(KERN_INFO "RAMDISK: [mem %#010llx-%#010llx]\n", ramdisk_image,
 375                         ramdisk_end - 1);
 376
 377         if (pfn_range_is_mapped(PFN_DOWN(ramdisk_image),
 378                                 PFN_DOWN(ramdisk_end))) {
 379                 /* All are mapped, easy case */
 380                 initrd_start = ramdisk_image + PAGE_OFFSET;
 381                 initrd_end = initrd_start + ramdisk_size;
 382                 return;
 383         }
 384
 385         relocate_initrd();
 386
 387         memblock_free(ramdisk_image, ramdisk_end - ramdisk_image);
 388 }
 389
 390 #else
 391 static void __init early_reserve_initrd(void)
 392 {
 393 }
 394 static void __init reserve_initrd(void)
 395 {
 396 }
 397 #endif /* CONFIG_BLK_DEV_INITRD */
 398
 399 static void __init parse_setup_data(void)
 400 {
 401         struct setup_data *data;
 402         u64 pa_data, pa_next;
 403
 404         pa_data = boot_params.hdr.setup_data;
 405         while (pa_data) {
 406                 u32 data_len, data_type;
 407
 408                 data = early_memremap(pa_data, sizeof(*data));
 409                 data_len = data->len + sizeof(struct setup_data);
 410                 data_type = data->type;
 411                 pa_next = data->next;
 412                 early_memunmap(data, sizeof(*data));
 413
 414                 switch (data_type) {
 415                 case SETUP_E820_EXT:
 416                         e820__memory_setup_extended(pa_data, data_len);
 417                         break;
 418                 case SETUP_DTB:
 419                         add_dtb(pa_data);
 420                         break;
 421                 case SETUP_EFI:
 422                         parse_efi_setup(pa_data, data_len);
 423                         break;
 424                 default:
 425                         break;
 426                 }
 427                 pa_data = pa_next;
 428         }
 429 }
 430
 431 static void __init memblock_x86_reserve_range_setup_data(void)
 432 {
 433         struct setup_data *data;
 434         u64 pa_data;
 435
 436         pa_data = boot_params.hdr.setup_data;
 437         while (pa_data) {
 438                 data = early_memremap(pa_data, sizeof(*data));
 439                 memblock_reserve(pa_data, sizeof(*data) + data->len);
 440                 pa_data = data->next;
 441                 early_memunmap(data, sizeof(*data));
 442         }
 443 }
 444
 445 /*
 446  * --------- Crashkernel reservation ------------------------------
 447  */
 448
 449 #ifdef CONFIG_KEXEC_CORE
 450
 451 /* 16M alignment for crash kernel regions */
 452 #define CRASH_ALIGN             (16 << 20)
 453
 454 /*
 455  * Keep the crash kernel below this limit.  On 32 bits earlier kernels
 456  * would limit the kernel to the low 512 MiB due to mapping restrictions.
 457  * On 64bit, old kexec-tools need to under 896MiB.
 458  */
 459 #ifdef CONFIG_X86_32
 460 # define CRASH_ADDR_LOW_MAX     (512 << 20)
 461 # define CRASH_ADDR_HIGH_MAX    (512 << 20)
 462 #else
 463 # define CRASH_ADDR_LOW_MAX     (896UL << 20)
 464 # define CRASH_ADDR_HIGH_MAX    MAXMEM
 465 #endif
 466
 467 static int __init reserve_crashkernel_low(void)
 468 {
 469 #ifdef CONFIG_X86_64
 470         unsigned long long base, low_base = 0, low_size = 0;
 471         unsigned long total_low_mem;
 472         int ret;
 473
 474         total_low_mem = memblock_mem_size(1UL << (32 - PAGE_SHIFT));
 475
 476         /* crashkernel=Y,low */
 477         ret = parse_crashkernel_low(boot_command_line, total_low_mem, &low_size, &base);
 478         if (ret) {
 479                 /*
 480                  * two parts from lib/swiotlb.c:
 481                  * -swiotlb size: user-specified with swiotlb= or default.
 482                  *
 483                  * -swiotlb overflow buffer: now hardcoded to 32k. We round it
 484                  * to 8M for other buffers that may need to stay low too. Also
 485                  * make sure we allocate enough extra low memory so that we
 486                  * don't run out of DMA buffers for 32-bit devices.
 487                  */
 488                 low_size = max(swiotlb_size_or_default() + (8UL << 20), 256UL << 20);
 489         } else {
 490                 /* passed with crashkernel=0,low ? */
 491                 if (!low_size)
 492                         return 0;
 493         }
 494
 495         low_base = memblock_find_in_range(0, 1ULL << 32, low_size, CRASH_ALIGN);
 496         if (!low_base) {
 497                 pr_err("Cannot reserve %ldMB crashkernel low memory, please try smaller size.\n",
 498                        (unsigned long)(low_size >> 20));
 499                 return -ENOMEM;
 500         }
 501
 502         ret = memblock_reserve(low_base, low_size);
 503         if (ret) {
 504                 pr_err("%s: Error reserving crashkernel low memblock.\n", __func__);
 505                 return ret;
 506         }
 507
 508         pr_info("Reserving %ldMB of low memory at %ldMB for crashkernel (System low RAM: %ldMB)\n",
 509                 (unsigned long)(low_size >> 20),
 510                 (unsigned long)(low_base >> 20),
 511                 (unsigned long)(total_low_mem >> 20));
 512
 513         crashk_low_res.start = low_base;
 514         crashk_low_res.end   = low_base + low_size - 1;
 515         insert_resource(&iomem_resource, &crashk_low_res);
 516 #endif
 517         return 0;
 518 }
 519
 520 static void __init reserve_crashkernel(void)
 521 {
 522         unsigned long long crash_size, crash_base, total_mem;
 523         bool high = false;
 524         int ret;
 525
 526         total_mem = memblock_phys_mem_size();
 527
 528         /* crashkernel=XM */
 529         ret = parse_crashkernel(boot_command_line, total_mem, &crash_size, &crash_base);
 530         if (ret != 0 || crash_size <= 0) {
 531                 /* crashkernel=X,high */
 532                 ret = parse_crashkernel_high(boot_command_line, total_mem,
 533                                              &crash_size, &crash_base);
 534                 if (ret != 0 || crash_size <= 0)
 535                         return;
 536                 high = true;
 537         }
 538
 539         /* 0 means: find the address automatically */
 540         if (crash_base <= 0) {
 541                 /*
 542                  * Set CRASH_ADDR_LOW_MAX upper bound for crash memory,
 543                  * as old kexec-tools loads bzImage below that, unless
 544                  * "crashkernel=size[KMG],high" is specified.
 545                  */
 546                 crash_base = memblock_find_in_range(CRASH_ALIGN,
 547                                                     high ? CRASH_ADDR_HIGH_MAX
 548                                                          : CRASH_ADDR_LOW_MAX,
 549                                                     crash_size, CRASH_ALIGN);
 550                 if (!crash_base) {
 551                         pr_info("crashkernel reservation failed - No suitable area found.\n");
 552                         return;
 553                 }
 554
 555         } else {
 556                 unsigned long long start;
 557
 558                 start = memblock_find_in_range(crash_base,
 559                                                crash_base + crash_size,
 560                                                crash_size, 1 << 20);
 561                 if (start != crash_base) {
 562                         pr_info("crashkernel reservation failed - memory is in use.\n");
 563                         return;
 564                 }
 565         }
 566         ret = memblock_reserve(crash_base, crash_size);
 567         if (ret) {
 568                 pr_err("%s: Error reserving crashkernel memblock.\n", __func__);
 569                 return;
 570         }
 571
 572         if (crash_base >= (1ULL << 32) && reserve_crashkernel_low()) {
 573                 memblock_free(crash_base, crash_size);
 574                 return;
 575         }
 576
 577         pr_info("Reserving %ldMB of memory at %ldMB for crashkernel (System RAM: %ldMB)\n",
 578                 (unsigned long)(crash_size >> 20),
 579                 (unsigned long)(crash_base >> 20),
 580                 (unsigned long)(total_mem >> 20));
 581
 582         crashk_res.start = crash_base;
 583         crashk_res.end   = crash_base + crash_size - 1;
 584         insert_resource(&iomem_resource, &crashk_res);
 585 }
 586 #else
 587 static void __init reserve_crashkernel(void)
 588 {
 589 }
 590 #endif
 591
 592 static struct resource standard_io_resources[] = {
 593         { .name = "dma1", .start = 0x00, .end = 0x1f,
 594                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 595         { .name = "pic1", .start = 0x20, .end = 0x21,
 596                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 597         { .name = "timer0", .start = 0x40, .end = 0x43,
 598                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 599         { .name = "timer1", .start = 0x50, .end = 0x53,
 600                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 601         { .name = "keyboard", .start = 0x60, .end = 0x60,
 602                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 603         { .name = "keyboard", .start = 0x64, .end = 0x64,
 604                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 605         { .name = "dma page reg", .start = 0x80, .end = 0x8f,
 606                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 607         { .name = "pic2", .start = 0xa0, .end = 0xa1,
 608                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 609         { .name = "dma2", .start = 0xc0, .end = 0xdf,
 610                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 611         { .name = "fpu", .start = 0xf0, .end = 0xff,
 612                 .flags = IORESOURCE_BUSY | IORESOURCE_IO }
 613 };
 614
 615 void __init reserve_standard_io_resources(void)
 616 {
 617         int i;
 618
 619         /* request I/O space for devices used on all i[345]86 PCs */
 620         for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
 621                 request_resource(&ioport_resource, &standard_io_resources[i]);
 622
 623 }
 624
 625 static __init void reserve_ibft_region(void)
 626 {
 627         unsigned long addr, size = 0;
 628
 629         addr = find_ibft_region(&size);
 630
 631         if (size)
 632                 memblock_reserve(addr, size);
 633 }
 634
 635 static bool __init snb_gfx_workaround_needed(void)
 636 {
 637 #ifdef CONFIG_PCI
 638         int i;
 639         u16 vendor, devid;
 640         static const __initconst u16 snb_ids[] = {
 641                 0x0102,
 642                 0x0112,
 643                 0x0122,
 644                 0x0106,
 645                 0x0116,
 646                 0x0126,
 647                 0x010a,
 648         };
 649
 650         /* Assume no if something weird is going on with PCI */
 651         if (!early_pci_allowed())
 652                 return false;
 653
 654         vendor = read_pci_config_16(0, 2, 0, PCI_VENDOR_ID);
 655         if (vendor != 0x8086)
 656                 return false;
 657
 658         devid = read_pci_config_16(0, 2, 0, PCI_DEVICE_ID);
 659         for (i = 0; i < ARRAY_SIZE(snb_ids); i++)
 660                 if (devid == snb_ids[i])
 661                         return true;
 662 #endif
 663
 664         return false;
 665 }
 666
 667 /*
 668  * Sandy Bridge graphics has trouble with certain ranges, exclude
 669  * them from allocation.
 670  */
 671 static void __init trim_snb_memory(void)
 672 {
 673         static const __initconst unsigned long bad_pages[] = {
 674                 0x20050000,
 675                 0x20110000,
 676                 0x20130000,
 677                 0x20138000,
 678                 0x40004000,
 679         };
 680         int i;
 681
 682         if (!snb_gfx_workaround_needed())
 683                 return;
 684
 685         printk(KERN_DEBUG "reserving inaccessible SNB gfx pages\n");
 686
 687         /*
 688          * Reserve all memory below the 1 MB mark that has not
 689          * already been reserved.
 690          */
 691         memblock_reserve(0, 1<<20);
 692
 693         for (i = 0; i < ARRAY_SIZE(bad_pages); i++) {
 694                 if (memblock_reserve(bad_pages[i], PAGE_SIZE))
 695                         printk(KERN_WARNING "failed to reserve 0x%08lx\n",
 696                                bad_pages[i]);
 697         }
 698 }
 699
 700 /*
 701  * Here we put platform-specific memory range workarounds, i.e.
 702  * memory known to be corrupt or otherwise in need to be reserved on
 703  * specific platforms.
 704  *
 705  * If this gets used more widely it could use a real dispatch mechanism.
 706  */
 707 static void __init trim_platform_memory_ranges(void)
 708 {
 709         trim_snb_memory();
 710 }
 711
 712 static void __init trim_bios_range(void)
 713 {
 714         /*
 715          * A special case is the first 4Kb of memory;
 716          * This is a BIOS owned area, not kernel ram, but generally
 717          * not listed as such in the E820 table.
 718          *
 719          * This typically reserves additional memory (64KiB by default)
 720          * since some BIOSes are known to corrupt low memory.  See the
 721          * Kconfig help text for X86_RESERVE_LOW.
 722          */
 723         e820__range_update(0, PAGE_SIZE, E820_TYPE_RAM, E820_TYPE_RESERVED);
 724
 725         /*
 726          * special case: Some BIOSen report the PC BIOS
 727          * area (640->1Mb) as ram even though it is not.
 728          * take them out.
 729          */
 730         e820__range_remove(BIOS_BEGIN, BIOS_END - BIOS_BEGIN, E820_TYPE_RAM, 1);
 731
 732         e820__update_table(e820_table);
 733 }
 734
 735 /* called before trim_bios_range() to spare extra sanitize */
 736 static void __init e820_add_kernel_range(void)
 737 {
 738         u64 start = __pa_symbol(_text);
 739         u64 size = __pa_symbol(_end) - start;
 740
 741         /*
 742          * Complain if .text .data and .bss are not marked as E820_TYPE_RAM and
 743          * attempt to fix it by adding the range. We may have a confused BIOS,
 744          * or the user may have used memmap=exactmap or memmap=xxM$yyM to
 745          * exclude kernel range. If we really are running on top non-RAM,
 746          * we will crash later anyways.
 747          */
 748         if (e820__mapped_all(start, start + size, E820_TYPE_RAM))
 749                 return;
 750
 751         pr_warn(".text .data .bss are not marked as E820_TYPE_RAM!\n");
 752         e820__range_remove(start, size, E820_TYPE_RAM, 0);
 753         e820__range_add(start, size, E820_TYPE_RAM);
 754 }
 755
 756 static unsigned reserve_low = CONFIG_X86_RESERVE_LOW << 10;
 757
 758 static int __init parse_reservelow(char *p)
 759 {
 760         unsigned long long size;
 761
 762         if (!p)
 763                 return -EINVAL;
 764
 765         size = memparse(p, &p);
 766
 767         if (size < 4096)
 768                 size = 4096;
 769
 770         if (size > 640*1024)
 771                 size = 640*1024;
 772
 773         reserve_low = size;
 774
 775         return 0;
 776 }
 777
 778 early_param("reservelow", parse_reservelow);
 779
 780 static void __init trim_low_memory_range(void)
 781 {
 782         memblock_reserve(0, ALIGN(reserve_low, PAGE_SIZE));
 783 }
 784
 785 /*
 786  * Dump out kernel offset information on panic.
 787  */
 788 static int
 789 dump_kernel_offset(struct notifier_block *self, unsigned long v, void *p)
 790 {
 791         if (kaslr_enabled()) {
 792                 pr_emerg("Kernel Offset: 0x%lx from 0x%lx (relocation range: 0x%lx-0x%lx)\n",
 793                          kaslr_offset(),
 794                          __START_KERNEL,
 795                          __START_KERNEL_map,
 796                          MODULES_VADDR-1);
 797         } else {
 798                 pr_emerg("Kernel Offset: disabled\n");
 799         }
 800
 801         return 0;
 802 }
 803
 804 /*
 805  * Determine if we were loaded by an EFI loader.  If so, then we have also been
 806  * passed the efi memmap, systab, etc., so we should use these data structures
 807  * for initialization.  Note, the efi init code path is determined by the
 808  * global efi_enabled. This allows the same kernel image to be used on existing
 809  * systems (with a traditional BIOS) as well as on EFI systems.
 810  */
 811 /*
 812  * setup_arch - architecture-specific boot-time initializations
 813  *
 814  * Note: On x86_64, fixmaps are ready for use even before this is called.
 815  */
 816
 817 void __init setup_arch(char **cmdline_p)
 818 {
 819         memblock_reserve(__pa_symbol(_text),
 820                          (unsigned long)__bss_stop - (unsigned long)_text);
 821
 822         early_reserve_initrd();
 823
 824         /*
 825          * At this point everything still needed from the boot loader
 826          * or BIOS or kernel text should be early reserved or marked not
 827          * RAM in e820. All other memory is free game.
 828          */
 829
 830 #ifdef CONFIG_X86_32
 831         memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
 832
 833         /*
 834          * copy kernel address range established so far and switch
 835          * to the proper swapper page table
 836          */
 837         clone_pgd_range(swapper_pg_dir     + KERNEL_PGD_BOUNDARY,
 838                         initial_page_table + KERNEL_PGD_BOUNDARY,
 839                         KERNEL_PGD_PTRS);
 840
 841         load_cr3(swapper_pg_dir);
 842         /*
 843          * Note: Quark X1000 CPUs advertise PGE incorrectly and require
 844          * a cr3 based tlb flush, so the following __flush_tlb_all()
 845          * will not flush anything because the cpu quirk which clears
 846          * X86_FEATURE_PGE has not been invoked yet. Though due to the
 847          * load_cr3() above the TLB has been flushed already. The
 848          * quirk is invoked before subsequent calls to __flush_tlb_all()
 849          * so proper operation is guaranteed.
 850          */
 851         __flush_tlb_all();
 852 #else
 853         printk(KERN_INFO "Command line: %s\n", boot_command_line);
 854 #endif
 855
 856         /*
 857          * If we have OLPC OFW, we might end up relocating the fixmap due to
 858          * reserve_top(), so do this before touching the ioremap area.
 859          */
 860         olpc_ofw_detect();
 861
 862         idt_setup_early_traps();
 863         early_cpu_init();
 864         early_ioremap_init();
 865
 866         setup_olpc_ofw_pgd();
 867
 868         ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
 869         screen_info = boot_params.screen_info;
 870         edid_info = boot_params.edid_info;
 871 #ifdef CONFIG_X86_32
 872         apm_info.bios = boot_params.apm_bios_info;
 873         ist_info = boot_params.ist_info;
 874 #endif
 875         saved_video_mode = boot_params.hdr.vid_mode;
 876         bootloader_type = boot_params.hdr.type_of_loader;
 877         if ((bootloader_type >> 4) == 0xe) {
 878                 bootloader_type &= 0xf;
 879                 bootloader_type |= (boot_params.hdr.ext_loader_type+0x10) << 4;
 880         }
 881         bootloader_version  = bootloader_type & 0xf;
 882         bootloader_version |= boot_params.hdr.ext_loader_ver << 4;
 883
 884 #ifdef CONFIG_BLK_DEV_RAM
 885         rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
 886         rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
 887         rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
 888 #endif
 889 #ifdef CONFIG_EFI
 890         if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
 891                      EFI32_LOADER_SIGNATURE, 4)) {
 892                 set_bit(EFI_BOOT, &efi.flags);
 893         } else if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
 894                      EFI64_LOADER_SIGNATURE, 4)) {
 895                 set_bit(EFI_BOOT, &efi.flags);
 896                 set_bit(EFI_64BIT, &efi.flags);
 897         }
 898 #endif
 899
 900         x86_init.oem.arch_setup();
 901
 902         iomem_resource.end = (1ULL << boot_cpu_data.x86_phys_bits) - 1;
 903         e820__memory_setup();
 904         parse_setup_data();
 905
 906         copy_edd();
 907
 908         if (!boot_params.hdr.root_flags)
 909                 root_mountflags &= ~MS_RDONLY;
 910         init_mm.start_code = (unsigned long) _text;
 911         init_mm.end_code = (unsigned long) _etext;
 912         init_mm.end_data = (unsigned long) _edata;
 913         init_mm.brk = _brk_end;
 914
 915         mpx_mm_init(&init_mm);
 916
 917         code_resource.start = __pa_symbol(_text);
 918         code_resource.end = __pa_symbol(_etext)-1;
 919         data_resource.start = __pa_symbol(_etext);
 920         data_resource.end = __pa_symbol(_edata)-1;
 921         bss_resource.start = __pa_symbol(__bss_start);
 922         bss_resource.end = __pa_symbol(__bss_stop)-1;
 923
 924 #ifdef CONFIG_CMDLINE_BOOL
 925 #ifdef CONFIG_CMDLINE_OVERRIDE
 926         strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
 927 #else
 928         if (builtin_cmdline[0]) {
 929                 /* append boot loader cmdline to builtin */
 930                 strlcat(builtin_cmdline, " ", COMMAND_LINE_SIZE);
 931                 strlcat(builtin_cmdline, boot_command_line, COMMAND_LINE_SIZE);
 932                 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
 933         }
 934 #endif
 935 #endif
 936
 937         strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
 938         *cmdline_p = command_line;
 939
 940         /*
 941          * x86_configure_nx() is called before parse_early_param() to detect
 942          * whether hardware doesn't support NX (so that the early EHCI debug
 943          * console setup can safely call set_fixmap()). It may then be called
 944          * again from within noexec_setup() during parsing early parameters
 945          * to honor the respective command line option.
 946          */
 947         x86_configure_nx();
 948
 949         parse_early_param();
 950
 951         if (efi_enabled(EFI_BOOT))
 952                 efi_memblock_x86_reserve_range();
 953 #ifdef CONFIG_MEMORY_HOTPLUG
 954         /*
 955          * Memory used by the kernel cannot be hot-removed because Linux
 956          * cannot migrate the kernel pages. When memory hotplug is
 957          * enabled, we should prevent memblock from allocating memory
 958          * for the kernel.
 959          *
 960          * ACPI SRAT records all hotpluggable memory ranges. But before
 961          * SRAT is parsed, we don't know about it.
 962          *
 963          * The kernel image is loaded into memory at very early time. We
 964          * cannot prevent this anyway. So on NUMA system, we set any
 965          * node the kernel resides in as un-hotpluggable.
 966          *
 967          * Since on modern servers, one node could have double-digit
 968          * gigabytes memory, we can assume the memory around the kernel
 969          * image is also un-hotpluggable. So before SRAT is parsed, just
 970          * allocate memory near the kernel image to try the best to keep
 971          * the kernel away from hotpluggable memory.
 972          */
 973         if (movable_node_is_enabled())
 974                 memblock_set_bottom_up(true);
 975 #endif
 976
 977         x86_report_nx();
 978
 979         /* after early param, so could get panic from serial */
 980         memblock_x86_reserve_range_setup_data();
 981
 982         if (acpi_mps_check()) {
 983 #ifdef CONFIG_X86_LOCAL_APIC
 984                 disable_apic = 1;
 985 #endif
 986                 setup_clear_cpu_cap(X86_FEATURE_APIC);
 987         }
 988
 989 #ifdef CONFIG_PCI
 990         if (pci_early_dump_regs)
 991                 early_dump_pci_devices();
 992 #endif
 993
 994         e820__reserve_setup_data();
 995         e820__finish_early_params();
 996
 997         if (efi_enabled(EFI_BOOT))
 998                 efi_init();
 999
1000         dmi_scan_machine();
1001         dmi_memdev_walk();
1002         dmi_set_dump_stack_arch_desc();
1003
1004         /*
1005          * VMware detection requires dmi to be available, so this
1006          * needs to be done after dmi_scan_machine(), for the boot CPU.
1007          */
1008         init_hypervisor_platform();
1009
1010         x86_init.resources.probe_roms();
1011
1012         /* after parse_early_param, so could debug it */
1013         insert_resource(&iomem_resource, &code_resource);
1014         insert_resource(&iomem_resource, &data_resource);
1015         insert_resource(&iomem_resource, &bss_resource);
1016
1017         e820_add_kernel_range();
1018         trim_bios_range();
1019 #ifdef CONFIG_X86_32
1020         if (ppro_with_ram_bug()) {
1021                 e820__range_update(0x70000000ULL, 0x40000ULL, E820_TYPE_RAM,
1022                                   E820_TYPE_RESERVED);
1023                 e820__update_table(e820_table);
1024                 printk(KERN_INFO "fixed physical RAM map:\n");
1025                 e820__print_table("bad_ppro");
1026         }
1027 #else
1028         early_gart_iommu_check();
1029 #endif
1030
1031         /*
1032          * partially used pages are not usable - thus
1033          * we are rounding upwards:
1034          */
1035         max_pfn = e820__end_of_ram_pfn();
1036
1037         /* update e820 for memory not covered by WB MTRRs */
1038         mtrr_bp_init();
1039         if (mtrr_trim_uncached_memory(max_pfn))
1040                 max_pfn = e820__end_of_ram_pfn();
1041
1042         max_possible_pfn = max_pfn;
1043
1044         /*
1045          * This call is required when the CPU does not support PAT. If
1046          * mtrr_bp_init() invoked it already via pat_init() the call has no
1047          * effect.
1048          */
1049         init_cache_modes();
1050
1051         /*
1052          * Define random base addresses for memory sections after max_pfn is
1053          * defined and before each memory section base is used.
1054          */
1055         kernel_randomize_memory();
1056
1057 #ifdef CONFIG_X86_32
1058         /* max_low_pfn get updated here */
1059         find_low_pfn_range();
1060 #else
1061         check_x2apic();
1062
1063         /* How many end-of-memory variables you have, grandma! */
1064         /* need this before calling reserve_initrd */
1065         if (max_pfn > (1UL<<(32 - PAGE_SHIFT)))
1066                 max_low_pfn = e820__end_of_low_ram_pfn();
1067         else
1068                 max_low_pfn = max_pfn;
1069
1070         high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
1071 #endif
1072
1073         /*
1074          * Find and reserve possible boot-time SMP configuration:
1075          */
1076         find_smp_config();
1077
1078         reserve_ibft_region();
1079
1080         early_alloc_pgt_buf();
1081
1082         /*
1083          * Need to conclude brk, before e820__memblock_setup()
1084          *  it could use memblock_find_in_range, could overlap with
1085          *  brk area.
1086          */
1087         reserve_brk();
1088
1089         cleanup_highmap();
1090
1091         memblock_set_current_limit(ISA_END_ADDRESS);
1092         e820__memblock_setup();
1093
1094         reserve_bios_regions();
1095
1096         if (efi_enabled(EFI_MEMMAP)) {
1097                 efi_fake_memmap();
1098                 efi_find_mirror();
1099                 efi_esrt_init();
1100
1101                 /*
1102                  * The EFI specification says that boot service code won't be
1103                  * called after ExitBootServices(). This is, in fact, a lie.
1104                  */
1105                 efi_reserve_boot_services();
1106         }
1107
1108         /* preallocate 4k for mptable mpc */
1109         e820__memblock_alloc_reserved_mpc_new();
1110
1111 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
1112         setup_bios_corruption_check();
1113 #endif
1114
1115 #ifdef CONFIG_X86_32
1116         printk(KERN_DEBUG "initial memory mapped: [mem 0x00000000-%#010lx]\n",
1117                         (max_pfn_mapped<<PAGE_SHIFT) - 1);
1118 #endif
1119
1120         reserve_real_mode();
1121
1122         trim_platform_memory_ranges();
1123         trim_low_memory_range();
1124
1125         init_mem_mapping();
1126
1127         idt_setup_early_pf();
1128
1129         /*
1130          * Update mmu_cr4_features (and, indirectly, trampoline_cr4_features)
1131          * with the current CR4 value.  This may not be necessary, but
1132          * auditing all the early-boot CR4 manipulation would be needed to
1133          * rule it out.
1134          *
1135          * Mask off features that don't work outside long mode (just
1136          * PCIDE for now).
1137          */
1138         mmu_cr4_features = __read_cr4() & ~X86_CR4_PCIDE;
1139
1140         memblock_set_current_limit(get_max_mapped());
1141
1142         /*
1143          * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
1144          */
1145
1146 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
1147         if (init_ohci1394_dma_early)
1148                 init_ohci1394_dma_on_all_controllers();
1149 #endif
1150         /* Allocate bigger log buffer */
1151         setup_log_buf(1);
1152
1153         if (efi_enabled(EFI_BOOT)) {
1154                 switch (boot_params.secure_boot) {
1155                 case efi_secureboot_mode_disabled:
1156                         pr_info("Secure boot disabled\n");
1157                         break;
1158                 case efi_secureboot_mode_enabled:
1159                         pr_info("Secure boot enabled\n");
1160                         break;
1161                 default:
1162                         pr_info("Secure boot could not be determined\n");
1163                         break;
1164                 }
1165         }
1166
1167         reserve_initrd();
1168
1169         acpi_table_upgrade();
1170
1171         vsmp_init();
1172
1173         io_delay_init();
1174
1175         early_platform_quirks();
1176
1177         /*
1178          * Parse the ACPI tables for possible boot-time SMP configuration.
1179          */
1180         acpi_boot_table_init();
1181
1182         early_acpi_boot_init();
1183
1184         initmem_init();
1185         dma_contiguous_reserve(max_pfn_mapped << PAGE_SHIFT);
1186
1187         /*
1188          * Reserve memory for crash kernel after SRAT is parsed so that it
1189          * won't consume hotpluggable memory.
1190          */
1191         reserve_crashkernel();
1192
1193         memblock_find_dma_reserve();
1194
1195 #ifdef CONFIG_KVM_GUEST
1196         kvmclock_init();
1197 #endif
1198
1199         tsc_early_delay_calibrate();
1200         if (!early_xdbc_setup_hardware())
1201                 early_xdbc_register_console();
1202
1203         x86_init.paging.pagetable_init();
1204
1205         kasan_init();
1206
1207 #ifdef CONFIG_X86_32
1208         /* sync back kernel address range */
1209         clone_pgd_range(initial_page_table + KERNEL_PGD_BOUNDARY,
1210                         swapper_pg_dir     + KERNEL_PGD_BOUNDARY,
1211                         KERNEL_PGD_PTRS);
1212
1213         /*
1214          * sync back low identity map too.  It is used for example
1215          * in the 32-bit EFI stub.
1216          */
1217         clone_pgd_range(initial_page_table,
1218                         swapper_pg_dir     + KERNEL_PGD_BOUNDARY,
1219                         min(KERNEL_PGD_PTRS, KERNEL_PGD_BOUNDARY));
1220 #endif
1221
1222         tboot_probe();
1223
1224         map_vsyscall();
1225
1226         generic_apic_probe();
1227
1228         early_quirks();
1229
1230         /*
1231          * Read APIC and some other early information from ACPI tables.
1232          */
1233         acpi_boot_init();
1234         sfi_init();
1235         x86_dtb_init();
1236
1237         /*
1238          * get boot-time SMP configuration:
1239          */
1240         get_smp_config();
1241
1242         /*
1243          * Systems w/o ACPI and mptables might not have it mapped the local
1244          * APIC yet, but prefill_possible_map() might need to access it.
1245          */
1246         init_apic_mappings();
1247
1248         prefill_possible_map();
1249
1250         init_cpu_to_node();
1251
1252         io_apic_init_mappings();
1253
1254         x86_init.hyper.guest_late_init();
1255
1256         e820__reserve_resources();
1257         e820__register_nosave_regions(max_low_pfn);
1258
1259         x86_init.resources.reserve_resources();
1260
1261         e820__setup_pci_gap();
1262
1263 #ifdef CONFIG_VT
1264 #if defined(CONFIG_VGA_CONSOLE)
1265         if (!efi_enabled(EFI_BOOT) || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
1266                 conswitchp = &vga_con;
1267 #elif defined(CONFIG_DUMMY_CONSOLE)
1268         conswitchp = &dummy_con;
1269 #endif
1270 #endif
1271         x86_init.oem.banner();
1272
1273         x86_init.timers.wallclock_init();
1274
1275         mcheck_init();
1276
1277         arch_init_ideal_nops();
1278
1279         register_refined_jiffies(CLOCK_TICK_RATE);
1280
1281 #ifdef CONFIG_EFI
1282         if (efi_enabled(EFI_BOOT))
1283                 efi_apply_memmap_quirks();
1284 #endif
1285
1286         unwind_init();
1287 }
1288
1289 #ifdef CONFIG_X86_32
1290
1291 static struct resource video_ram_resource = {
1292         .name   = "Video RAM area",
1293         .start  = 0xa0000,
1294         .end    = 0xbffff,
1295         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
1296 };
1297
1298 void __init i386_reserve_resources(void)
1299 {
1300         request_resource(&iomem_resource, &video_ram_resource);
1301         reserve_standard_io_resources();
1302 }
1303
1304 #endif /* CONFIG_X86_32 */
1305
1306 static struct notifier_block kernel_offset_notifier = {
1307         .notifier_call = dump_kernel_offset
1308 };
1309
1310 static int __init register_kernel_offset_dumper(void)
1311 {
1312         atomic_notifier_chain_register(&panic_notifier_list,
1313                                         &kernel_offset_notifier);
1314         return 0;
1315 }
1316 __initcall(register_kernel_offset_dumper);
1317
1318 void arch_show_smap(struct seq_file *m, struct vm_area_struct *vma)
1319 {
1320         if (!boot_cpu_has(X86_FEATURE_OSPKE))
1321                 return;
1322
1323         seq_printf(m, "ProtectionKey:  %8u\n", vma_pkey(vma));
1324 }