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
  72 #include <video/edid.h>
  73
  74 #include <asm/mtrr.h>
  75 #include <asm/apic.h>
  76 #include <asm/realmode.h>
  77 #include <asm/e820.h>
  78 #include <asm/mpspec.h>
  79 #include <asm/setup.h>
  80 #include <asm/efi.h>
  81 #include <asm/timer.h>
  82 #include <asm/i8259.h>
  83 #include <asm/sections.h>
  84 #include <asm/dmi.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
  93 #include <asm/vsyscall.h>
  94 #include <asm/cpu.h>
  95 #include <asm/desc.h>
  96 #include <asm/dma.h>
  97 #include <asm/iommu.h>
  98 #include <asm/gart.h>
  99 #include <asm/mmu_context.h>
 100 #include <asm/proto.h>
 101
 102 #include <asm/paravirt.h>
 103 #include <asm/hypervisor.h>
 104 #include <asm/olpc_ofw.h>
 105
 106 #include <asm/percpu.h>
 107 #include <asm/topology.h>
 108 #include <asm/apicdef.h>
 109 #include <asm/amd_nb.h>
 110 #ifdef CONFIG_X86_64
 111 #include <asm/numa_64.h>
 112 #endif
 113 #include <asm/mce.h>
 114 #include <asm/alternative.h>
 115 #include <asm/prom.h>
 116
 117 /*
 118  * end_pfn only includes RAM, while max_pfn_mapped includes all e820 entries.
 119  * The direct mapping extends to max_pfn_mapped, so that we can directly access
 120  * apertures, ACPI and other tables without having to play with fixmaps.
 121  */
 122 unsigned long max_low_pfn_mapped;
 123 unsigned long max_pfn_mapped;
 124
 125 #ifdef CONFIG_DMI
 126 RESERVE_BRK(dmi_alloc, 65536);
 127 #endif
 128
 129
 130 static __initdata unsigned long _brk_start = (unsigned long)__brk_base;
 131 unsigned long _brk_end = (unsigned long)__brk_base;
 132
 133 #ifdef CONFIG_X86_64
 134 int default_cpu_present_to_apicid(int mps_cpu)
 135 {
 136         return __default_cpu_present_to_apicid(mps_cpu);
 137 }
 138
 139 int default_check_phys_apicid_present(int phys_apicid)
 140 {
 141         return __default_check_phys_apicid_present(phys_apicid);
 142 }
 143 #endif
 144
 145 #ifndef CONFIG_DEBUG_BOOT_PARAMS
 146 struct boot_params __initdata boot_params;
 147 #else
 148 struct boot_params boot_params;
 149 #endif
 150
 151 /*
 152  * Machine setup..
 153  */
 154 static struct resource data_resource = {
 155         .name   = "Kernel data",
 156         .start  = 0,
 157         .end    = 0,
 158         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
 159 };
 160
 161 static struct resource code_resource = {
 162         .name   = "Kernel code",
 163         .start  = 0,
 164         .end    = 0,
 165         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
 166 };
 167
 168 static struct resource bss_resource = {
 169         .name   = "Kernel bss",
 170         .start  = 0,
 171         .end    = 0,
 172         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
 173 };
 174
 175
 176 #ifdef CONFIG_X86_32
 177 /* cpu data as detected by the assembly code in head.S */
 178 struct cpuinfo_x86 new_cpu_data __cpuinitdata = {0, 0, 0, 0, -1, 1, 0, 0, -1};
 179 /* common cpu data for all cpus */
 180 struct cpuinfo_x86 boot_cpu_data __read_mostly = {0, 0, 0, 0, -1, 1, 0, 0, -1};
 181 EXPORT_SYMBOL(boot_cpu_data);
 182
 183 unsigned int def_to_bigsmp;
 184
 185 /* for MCA, but anyone else can use it if they want */
 186 unsigned int machine_id;
 187 unsigned int machine_submodel_id;
 188 unsigned int BIOS_revision;
 189
 190 struct apm_info apm_info;
 191 EXPORT_SYMBOL(apm_info);
 192
 193 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
 194         defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
 195 struct ist_info ist_info;
 196 EXPORT_SYMBOL(ist_info);
 197 #else
 198 struct ist_info ist_info;
 199 #endif
 200
 201 #else
 202 struct cpuinfo_x86 boot_cpu_data __read_mostly = {
 203         .x86_phys_bits = MAX_PHYSMEM_BITS,
 204 };
 205 EXPORT_SYMBOL(boot_cpu_data);
 206 #endif
 207
 208
 209 #if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64)
 210 unsigned long mmu_cr4_features;
 211 #else
 212 unsigned long mmu_cr4_features = X86_CR4_PAE;
 213 #endif
 214
 215 /* Boot loader ID and version as integers, for the benefit of proc_dointvec */
 216 int bootloader_type, bootloader_version;
 217
 218 /*
 219  * Setup options
 220  */
 221 struct screen_info screen_info;
 222 EXPORT_SYMBOL(screen_info);
 223 struct edid_info edid_info;
 224 EXPORT_SYMBOL_GPL(edid_info);
 225
 226 extern int root_mountflags;
 227
 228 unsigned long saved_video_mode;
 229
 230 #define RAMDISK_IMAGE_START_MASK        0x07FF
 231 #define RAMDISK_PROMPT_FLAG             0x8000
 232 #define RAMDISK_LOAD_FLAG               0x4000
 233
 234 static char __initdata command_line[COMMAND_LINE_SIZE];
 235 #ifdef CONFIG_CMDLINE_BOOL
 236 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
 237 #endif
 238
 239 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
 240 struct edd edd;
 241 #ifdef CONFIG_EDD_MODULE
 242 EXPORT_SYMBOL(edd);
 243 #endif
 244 /**
 245  * copy_edd() - Copy the BIOS EDD information
 246  *              from boot_params into a safe place.
 247  *
 248  */
 249 static inline void __init copy_edd(void)
 250 {
 251      memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer,
 252             sizeof(edd.mbr_signature));
 253      memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
 254      edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
 255      edd.edd_info_nr = boot_params.eddbuf_entries;
 256 }
 257 #else
 258 static inline void __init copy_edd(void)
 259 {
 260 }
 261 #endif
 262
 263 void * __init extend_brk(size_t size, size_t align)
 264 {
 265         size_t mask = align - 1;
 266         void *ret;
 267
 268         BUG_ON(_brk_start == 0);
 269         BUG_ON(align & mask);
 270
 271         _brk_end = (_brk_end + mask) & ~mask;
 272         BUG_ON((char *)(_brk_end + size) > __brk_limit);
 273
 274         ret = (void *)_brk_end;
 275         _brk_end += size;
 276
 277         memset(ret, 0, size);
 278
 279         return ret;
 280 }
 281
 282 #ifdef CONFIG_X86_64
 283 static void __init init_gbpages(void)
 284 {
 285         if (direct_gbpages && cpu_has_gbpages)
 286                 printk(KERN_INFO "Using GB pages for direct mapping\n");
 287         else
 288                 direct_gbpages = 0;
 289 }
 290 #else
 291 static inline void init_gbpages(void)
 292 {
 293 }
 294 static void __init cleanup_highmap(void)
 295 {
 296 }
 297 #endif
 298
 299 static void __init reserve_brk(void)
 300 {
 301         if (_brk_end > _brk_start)
 302                 memblock_reserve(__pa(_brk_start),
 303                                  __pa(_brk_end) - __pa(_brk_start));
 304
 305         /* Mark brk area as locked down and no longer taking any
 306            new allocations */
 307         _brk_start = 0;
 308 }
 309
 310 #ifdef CONFIG_BLK_DEV_INITRD
 311
 312 #define MAX_MAP_CHUNK   (NR_FIX_BTMAPS << PAGE_SHIFT)
 313 static void __init relocate_initrd(void)
 314 {
 315         /* Assume only end is not page aligned */
 316         u64 ramdisk_image = boot_params.hdr.ramdisk_image;
 317         u64 ramdisk_size  = boot_params.hdr.ramdisk_size;
 318         u64 area_size     = PAGE_ALIGN(ramdisk_size);
 319         u64 end_of_lowmem = max_low_pfn_mapped << PAGE_SHIFT;
 320         u64 ramdisk_here;
 321         unsigned long slop, clen, mapaddr;
 322         char *p, *q;
 323
 324         /* We need to move the initrd down into lowmem */
 325         ramdisk_here = memblock_find_in_range(0, end_of_lowmem, area_size,
 326                                          PAGE_SIZE);
 327
 328         if (!ramdisk_here)
 329                 panic("Cannot find place for new RAMDISK of size %lld\n",
 330                          ramdisk_size);
 331
 332         /* Note: this includes all the lowmem currently occupied by
 333            the initrd, we rely on that fact to keep the data intact. */
 334         memblock_reserve(ramdisk_here, area_size);
 335         initrd_start = ramdisk_here + PAGE_OFFSET;
 336         initrd_end   = initrd_start + ramdisk_size;
 337         printk(KERN_INFO "Allocated new RAMDISK: [mem %#010llx-%#010llx]\n",
 338                          ramdisk_here, ramdisk_here + ramdisk_size - 1);
 339
 340         q = (char *)initrd_start;
 341
 342         /* Copy any lowmem portion of the initrd */
 343         if (ramdisk_image < end_of_lowmem) {
 344                 clen = end_of_lowmem - ramdisk_image;
 345                 p = (char *)__va(ramdisk_image);
 346                 memcpy(q, p, clen);
 347                 q += clen;
 348                 ramdisk_image += clen;
 349                 ramdisk_size  -= clen;
 350         }
 351
 352         /* Copy the highmem portion of the initrd */
 353         while (ramdisk_size) {
 354                 slop = ramdisk_image & ~PAGE_MASK;
 355                 clen = ramdisk_size;
 356                 if (clen > MAX_MAP_CHUNK-slop)
 357                         clen = MAX_MAP_CHUNK-slop;
 358                 mapaddr = ramdisk_image & PAGE_MASK;
 359                 p = early_memremap(mapaddr, clen+slop);
 360                 memcpy(q, p+slop, clen);
 361                 early_iounmap(p, clen+slop);
 362                 q += clen;
 363                 ramdisk_image += clen;
 364                 ramdisk_size  -= clen;
 365         }
 366         /* high pages is not converted by early_res_to_bootmem */
 367         ramdisk_image = boot_params.hdr.ramdisk_image;
 368         ramdisk_size  = boot_params.hdr.ramdisk_size;
 369         printk(KERN_INFO "Move RAMDISK from [mem %#010llx-%#010llx] to"
 370                 " [mem %#010llx-%#010llx]\n",
 371                 ramdisk_image, ramdisk_image + ramdisk_size - 1,
 372                 ramdisk_here, ramdisk_here + ramdisk_size - 1);
 373 }
 374
 375 static void __init reserve_initrd(void)
 376 {
 377         /* Assume only end is not page aligned */
 378         u64 ramdisk_image = boot_params.hdr.ramdisk_image;
 379         u64 ramdisk_size  = boot_params.hdr.ramdisk_size;
 380         u64 ramdisk_end   = PAGE_ALIGN(ramdisk_image + ramdisk_size);
 381         u64 end_of_lowmem = max_low_pfn_mapped << PAGE_SHIFT;
 382
 383         if (!boot_params.hdr.type_of_loader ||
 384             !ramdisk_image || !ramdisk_size)
 385                 return;         /* No initrd provided by bootloader */
 386
 387         initrd_start = 0;
 388
 389         if (ramdisk_size >= (end_of_lowmem>>1)) {
 390                 panic("initrd too large to handle, "
 391                        "disabling initrd (%lld needed, %lld available)\n",
 392                        ramdisk_size, end_of_lowmem>>1);
 393         }
 394
 395         printk(KERN_INFO "RAMDISK: [mem %#010llx-%#010llx]\n", ramdisk_image,
 396                         ramdisk_end - 1);
 397
 398
 399         if (ramdisk_end <= end_of_lowmem) {
 400                 /* All in lowmem, easy case */
 401                 /*
 402                  * don't need to reserve again, already reserved early
 403                  * in i386_start_kernel
 404                  */
 405                 initrd_start = ramdisk_image + PAGE_OFFSET;
 406                 initrd_end = initrd_start + ramdisk_size;
 407                 return;
 408         }
 409
 410         relocate_initrd();
 411
 412         memblock_free(ramdisk_image, ramdisk_end - ramdisk_image);
 413 }
 414 #else
 415 static void __init reserve_initrd(void)
 416 {
 417 }
 418 #endif /* CONFIG_BLK_DEV_INITRD */
 419
 420 static void __init parse_setup_data(void)
 421 {
 422         struct setup_data *data;
 423         u64 pa_data;
 424
 425         if (boot_params.hdr.version < 0x0209)
 426                 return;
 427         pa_data = boot_params.hdr.setup_data;
 428         while (pa_data) {
 429                 u32 data_len, map_len;
 430
 431                 map_len = max(PAGE_SIZE - (pa_data & ~PAGE_MASK),
 432                               (u64)sizeof(struct setup_data));
 433                 data = early_memremap(pa_data, map_len);
 434                 data_len = data->len + sizeof(struct setup_data);
 435                 if (data_len > map_len) {
 436                         early_iounmap(data, map_len);
 437                         data = early_memremap(pa_data, data_len);
 438                         map_len = data_len;
 439                 }
 440
 441                 switch (data->type) {
 442                 case SETUP_E820_EXT:
 443                         parse_e820_ext(data);
 444                         break;
 445                 case SETUP_DTB:
 446                         add_dtb(pa_data);
 447                         break;
 448                 default:
 449                         break;
 450                 }
 451                 pa_data = data->next;
 452                 early_iounmap(data, map_len);
 453         }
 454 }
 455
 456 static void __init e820_reserve_setup_data(void)
 457 {
 458         struct setup_data *data;
 459         u64 pa_data;
 460         int found = 0;
 461
 462         if (boot_params.hdr.version < 0x0209)
 463                 return;
 464         pa_data = boot_params.hdr.setup_data;
 465         while (pa_data) {
 466                 data = early_memremap(pa_data, sizeof(*data));
 467                 e820_update_range(pa_data, sizeof(*data)+data->len,
 468                          E820_RAM, E820_RESERVED_KERN);
 469                 found = 1;
 470                 pa_data = data->next;
 471                 early_iounmap(data, sizeof(*data));
 472         }
 473         if (!found)
 474                 return;
 475
 476         sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 477         memcpy(&e820_saved, &e820, sizeof(struct e820map));
 478         printk(KERN_INFO "extended physical RAM map:\n");
 479         e820_print_map("reserve setup_data");
 480 }
 481
 482 static void __init memblock_x86_reserve_range_setup_data(void)
 483 {
 484         struct setup_data *data;
 485         u64 pa_data;
 486
 487         if (boot_params.hdr.version < 0x0209)
 488                 return;
 489         pa_data = boot_params.hdr.setup_data;
 490         while (pa_data) {
 491                 data = early_memremap(pa_data, sizeof(*data));
 492                 memblock_reserve(pa_data, sizeof(*data) + data->len);
 493                 pa_data = data->next;
 494                 early_iounmap(data, sizeof(*data));
 495         }
 496 }
 497
 498 /*
 499  * --------- Crashkernel reservation ------------------------------
 500  */
 501
 502 #ifdef CONFIG_KEXEC
 503
 504 /*
 505  * Keep the crash kernel below this limit.  On 32 bits earlier kernels
 506  * would limit the kernel to the low 512 MiB due to mapping restrictions.
 507  * On 64 bits, kexec-tools currently limits us to 896 MiB; increase this
 508  * limit once kexec-tools are fixed.
 509  */
 510 #ifdef CONFIG_X86_32
 511 # define CRASH_KERNEL_ADDR_MAX  (512 << 20)
 512 #else
 513 # define CRASH_KERNEL_ADDR_MAX  (896 << 20)
 514 #endif
 515
 516 static void __init reserve_crashkernel(void)
 517 {
 518         unsigned long long total_mem;
 519         unsigned long long crash_size, crash_base;
 520         int ret;
 521
 522         total_mem = memblock_phys_mem_size();
 523
 524         ret = parse_crashkernel(boot_command_line, total_mem,
 525                         &crash_size, &crash_base);
 526         if (ret != 0 || crash_size <= 0)
 527                 return;
 528
 529         /* 0 means: find the address automatically */
 530         if (crash_base <= 0) {
 531                 const unsigned long long alignment = 16<<20;    /* 16M */
 532
 533                 /*
 534                  *  kexec want bzImage is below CRASH_KERNEL_ADDR_MAX
 535                  */
 536                 crash_base = memblock_find_in_range(alignment,
 537                                CRASH_KERNEL_ADDR_MAX, crash_size, alignment);
 538
 539                 if (!crash_base) {
 540                         pr_info("crashkernel reservation failed - No suitable area found.\n");
 541                         return;
 542                 }
 543         } else {
 544                 unsigned long long start;
 545
 546                 start = memblock_find_in_range(crash_base,
 547                                  crash_base + crash_size, crash_size, 1<<20);
 548                 if (start != crash_base) {
 549                         pr_info("crashkernel reservation failed - memory is in use.\n");
 550                         return;
 551                 }
 552         }
 553         memblock_reserve(crash_base, crash_size);
 554
 555         printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
 556                         "for crashkernel (System RAM: %ldMB)\n",
 557                         (unsigned long)(crash_size >> 20),
 558                         (unsigned long)(crash_base >> 20),
 559                         (unsigned long)(total_mem >> 20));
 560
 561         crashk_res.start = crash_base;
 562         crashk_res.end   = crash_base + crash_size - 1;
 563         insert_resource(&iomem_resource, &crashk_res);
 564 }
 565 #else
 566 static void __init reserve_crashkernel(void)
 567 {
 568 }
 569 #endif
 570
 571 static struct resource standard_io_resources[] = {
 572         { .name = "dma1", .start = 0x00, .end = 0x1f,
 573                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 574         { .name = "pic1", .start = 0x20, .end = 0x21,
 575                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 576         { .name = "timer0", .start = 0x40, .end = 0x43,
 577                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 578         { .name = "timer1", .start = 0x50, .end = 0x53,
 579                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 580         { .name = "keyboard", .start = 0x60, .end = 0x60,
 581                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 582         { .name = "keyboard", .start = 0x64, .end = 0x64,
 583                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 584         { .name = "dma page reg", .start = 0x80, .end = 0x8f,
 585                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 586         { .name = "pic2", .start = 0xa0, .end = 0xa1,
 587                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 588         { .name = "dma2", .start = 0xc0, .end = 0xdf,
 589                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 590         { .name = "fpu", .start = 0xf0, .end = 0xff,
 591                 .flags = IORESOURCE_BUSY | IORESOURCE_IO }
 592 };
 593
 594 void __init reserve_standard_io_resources(void)
 595 {
 596         int i;
 597
 598         /* request I/O space for devices used on all i[345]86 PCs */
 599         for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
 600                 request_resource(&ioport_resource, &standard_io_resources[i]);
 601
 602 }
 603
 604 static __init void reserve_ibft_region(void)
 605 {
 606         unsigned long addr, size = 0;
 607
 608         addr = find_ibft_region(&size);
 609
 610         if (size)
 611                 memblock_reserve(addr, size);
 612 }
 613
 614 static unsigned reserve_low = CONFIG_X86_RESERVE_LOW << 10;
 615
 616 static void __init trim_bios_range(void)
 617 {
 618         /*
 619          * A special case is the first 4Kb of memory;
 620          * This is a BIOS owned area, not kernel ram, but generally
 621          * not listed as such in the E820 table.
 622          *
 623          * This typically reserves additional memory (64KiB by default)
 624          * since some BIOSes are known to corrupt low memory.  See the
 625          * Kconfig help text for X86_RESERVE_LOW.
 626          */
 627         e820_update_range(0, ALIGN(reserve_low, PAGE_SIZE),
 628                           E820_RAM, E820_RESERVED);
 629
 630         /*
 631          * special case: Some BIOSen report the PC BIOS
 632          * area (640->1Mb) as ram even though it is not.
 633          * take them out.
 634          */
 635         e820_remove_range(BIOS_BEGIN, BIOS_END - BIOS_BEGIN, E820_RAM, 1);
 636         sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 637 }
 638
 639 static int __init parse_reservelow(char *p)
 640 {
 641         unsigned long long size;
 642
 643         if (!p)
 644                 return -EINVAL;
 645
 646         size = memparse(p, &p);
 647
 648         if (size < 4096)
 649                 size = 4096;
 650
 651         if (size > 640*1024)
 652                 size = 640*1024;
 653
 654         reserve_low = size;
 655
 656         return 0;
 657 }
 658
 659 early_param("reservelow", parse_reservelow);
 660
 661 /*
 662  * Determine if we were loaded by an EFI loader.  If so, then we have also been
 663  * passed the efi memmap, systab, etc., so we should use these data structures
 664  * for initialization.  Note, the efi init code path is determined by the
 665  * global efi_enabled. This allows the same kernel image to be used on existing
 666  * systems (with a traditional BIOS) as well as on EFI systems.
 667  */
 668 /*
 669  * setup_arch - architecture-specific boot-time initializations
 670  *
 671  * Note: On x86_64, fixmaps are ready for use even before this is called.
 672  */
 673
 674 void __init setup_arch(char **cmdline_p)
 675 {
 676 #ifdef CONFIG_X86_32
 677         memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
 678         visws_early_detect();
 679
 680         /*
 681          * copy kernel address range established so far and switch
 682          * to the proper swapper page table
 683          */
 684         clone_pgd_range(swapper_pg_dir     + KERNEL_PGD_BOUNDARY,
 685                         initial_page_table + KERNEL_PGD_BOUNDARY,
 686                         KERNEL_PGD_PTRS);
 687
 688         load_cr3(swapper_pg_dir);
 689         __flush_tlb_all();
 690 #else
 691         printk(KERN_INFO "Command line: %s\n", boot_command_line);
 692 #endif
 693
 694         /*
 695          * If we have OLPC OFW, we might end up relocating the fixmap due to
 696          * reserve_top(), so do this before touching the ioremap area.
 697          */
 698         olpc_ofw_detect();
 699
 700         early_trap_init();
 701         early_cpu_init();
 702         early_ioremap_init();
 703
 704         setup_olpc_ofw_pgd();
 705
 706         ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
 707         screen_info = boot_params.screen_info;
 708         edid_info = boot_params.edid_info;
 709 #ifdef CONFIG_X86_32
 710         apm_info.bios = boot_params.apm_bios_info;
 711         ist_info = boot_params.ist_info;
 712         if (boot_params.sys_desc_table.length != 0) {
 713                 machine_id = boot_params.sys_desc_table.table[0];
 714                 machine_submodel_id = boot_params.sys_desc_table.table[1];
 715                 BIOS_revision = boot_params.sys_desc_table.table[2];
 716         }
 717 #endif
 718         saved_video_mode = boot_params.hdr.vid_mode;
 719         bootloader_type = boot_params.hdr.type_of_loader;
 720         if ((bootloader_type >> 4) == 0xe) {
 721                 bootloader_type &= 0xf;
 722                 bootloader_type |= (boot_params.hdr.ext_loader_type+0x10) << 4;
 723         }
 724         bootloader_version  = bootloader_type & 0xf;
 725         bootloader_version |= boot_params.hdr.ext_loader_ver << 4;
 726
 727 #ifdef CONFIG_BLK_DEV_RAM
 728         rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
 729         rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
 730         rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
 731 #endif
 732 #ifdef CONFIG_EFI
 733         if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
 734                      "EL32", 4)) {
 735                 efi_enabled = 1;
 736                 efi_64bit = false;
 737         } else if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
 738                      "EL64", 4)) {
 739                 efi_enabled = 1;
 740                 efi_64bit = true;
 741         }
 742         if (efi_enabled && efi_memblock_x86_reserve_range())
 743                 efi_enabled = 0;
 744 #endif
 745
 746         x86_init.oem.arch_setup();
 747
 748         iomem_resource.end = (1ULL << boot_cpu_data.x86_phys_bits) - 1;
 749         setup_memory_map();
 750         parse_setup_data();
 751         /* update the e820_saved too */
 752         e820_reserve_setup_data();
 753
 754         copy_edd();
 755
 756         if (!boot_params.hdr.root_flags)
 757                 root_mountflags &= ~MS_RDONLY;
 758         init_mm.start_code = (unsigned long) _text;
 759         init_mm.end_code = (unsigned long) _etext;
 760         init_mm.end_data = (unsigned long) _edata;
 761         init_mm.brk = _brk_end;
 762
 763         code_resource.start = virt_to_phys(_text);
 764         code_resource.end = virt_to_phys(_etext)-1;
 765         data_resource.start = virt_to_phys(_etext);
 766         data_resource.end = virt_to_phys(_edata)-1;
 767         bss_resource.start = virt_to_phys(&__bss_start);
 768         bss_resource.end = virt_to_phys(&__bss_stop)-1;
 769
 770 #ifdef CONFIG_CMDLINE_BOOL
 771 #ifdef CONFIG_CMDLINE_OVERRIDE
 772         strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
 773 #else
 774         if (builtin_cmdline[0]) {
 775                 /* append boot loader cmdline to builtin */
 776                 strlcat(builtin_cmdline, " ", COMMAND_LINE_SIZE);
 777                 strlcat(builtin_cmdline, boot_command_line, COMMAND_LINE_SIZE);
 778                 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
 779         }
 780 #endif
 781 #endif
 782
 783         strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
 784         *cmdline_p = command_line;
 785
 786         /*
 787          * x86_configure_nx() is called before parse_early_param() to detect
 788          * whether hardware doesn't support NX (so that the early EHCI debug
 789          * console setup can safely call set_fixmap()). It may then be called
 790          * again from within noexec_setup() during parsing early parameters
 791          * to honor the respective command line option.
 792          */
 793         x86_configure_nx();
 794
 795         parse_early_param();
 796
 797         x86_report_nx();
 798
 799         /* after early param, so could get panic from serial */
 800         memblock_x86_reserve_range_setup_data();
 801
 802         if (acpi_mps_check()) {
 803 #ifdef CONFIG_X86_LOCAL_APIC
 804                 disable_apic = 1;
 805 #endif
 806                 setup_clear_cpu_cap(X86_FEATURE_APIC);
 807         }
 808
 809 #ifdef CONFIG_PCI
 810         if (pci_early_dump_regs)
 811                 early_dump_pci_devices();
 812 #endif
 813
 814         finish_e820_parsing();
 815
 816         if (efi_enabled)
 817                 efi_init();
 818
 819         dmi_scan_machine();
 820
 821         /*
 822          * VMware detection requires dmi to be available, so this
 823          * needs to be done after dmi_scan_machine, for the BP.
 824          */
 825         init_hypervisor_platform();
 826
 827         x86_init.resources.probe_roms();
 828
 829         /* after parse_early_param, so could debug it */
 830         insert_resource(&iomem_resource, &code_resource);
 831         insert_resource(&iomem_resource, &data_resource);
 832         insert_resource(&iomem_resource, &bss_resource);
 833
 834         trim_bios_range();
 835 #ifdef CONFIG_X86_32
 836         if (ppro_with_ram_bug()) {
 837                 e820_update_range(0x70000000ULL, 0x40000ULL, E820_RAM,
 838                                   E820_RESERVED);
 839                 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 840                 printk(KERN_INFO "fixed physical RAM map:\n");
 841                 e820_print_map("bad_ppro");
 842         }
 843 #else
 844         early_gart_iommu_check();
 845 #endif
 846
 847         /*
 848          * partially used pages are not usable - thus
 849          * we are rounding upwards:
 850          */
 851         max_pfn = e820_end_of_ram_pfn();
 852
 853         /* update e820 for memory not covered by WB MTRRs */
 854         mtrr_bp_init();
 855         if (mtrr_trim_uncached_memory(max_pfn))
 856                 max_pfn = e820_end_of_ram_pfn();
 857
 858 #ifdef CONFIG_X86_32
 859         /* max_low_pfn get updated here */
 860         find_low_pfn_range();
 861 #else
 862         num_physpages = max_pfn;
 863
 864         check_x2apic();
 865
 866         /* How many end-of-memory variables you have, grandma! */
 867         /* need this before calling reserve_initrd */
 868         if (max_pfn > (1UL<<(32 - PAGE_SHIFT)))
 869                 max_low_pfn = e820_end_of_low_ram_pfn();
 870         else
 871                 max_low_pfn = max_pfn;
 872
 873         high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
 874 #endif
 875
 876         /*
 877          * Find and reserve possible boot-time SMP configuration:
 878          */
 879         find_smp_config();
 880
 881         reserve_ibft_region();
 882
 883         /*
 884          * Need to conclude brk, before memblock_x86_fill()
 885          *  it could use memblock_find_in_range, could overlap with
 886          *  brk area.
 887          */
 888         reserve_brk();
 889
 890         cleanup_highmap();
 891
 892         memblock.current_limit = get_max_mapped();
 893         memblock_x86_fill();
 894
 895         /*
 896          * The EFI specification says that boot service code won't be called
 897          * after ExitBootServices(). This is, in fact, a lie.
 898          */
 899         if (efi_enabled)
 900                 efi_reserve_boot_services();
 901
 902         /* preallocate 4k for mptable mpc */
 903         early_reserve_e820_mpc_new();
 904
 905 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
 906         setup_bios_corruption_check();
 907 #endif
 908
 909         printk(KERN_DEBUG "initial memory mapped: [mem 0x00000000-%#010lx]\n",
 910                         (max_pfn_mapped<<PAGE_SHIFT) - 1);
 911
 912         setup_real_mode();
 913
 914         init_gbpages();
 915
 916         /* max_pfn_mapped is updated here */
 917         max_low_pfn_mapped = init_memory_mapping(0, max_low_pfn<<PAGE_SHIFT);
 918         max_pfn_mapped = max_low_pfn_mapped;
 919
 920 #ifdef CONFIG_X86_64
 921         if (max_pfn > max_low_pfn) {
 922                 int i;
 923                 unsigned long start, end;
 924                 unsigned long start_pfn, end_pfn;
 925
 926                 for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn,
 927                                                          NULL) {
 928
 929                         end = PFN_PHYS(end_pfn);
 930                         if (end <= (1UL<<32))
 931                                 continue;
 932
 933                         start = PFN_PHYS(start_pfn);
 934                         max_pfn_mapped = init_memory_mapping(
 935                                                 max((1UL<<32), start), end);
 936                 }
 937
 938                 /* can we preseve max_low_pfn ?*/
 939                 max_low_pfn = max_pfn;
 940         }
 941 #endif
 942         memblock.current_limit = get_max_mapped();
 943         dma_contiguous_reserve(0);
 944
 945         /*
 946          * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
 947          */
 948
 949 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
 950         if (init_ohci1394_dma_early)
 951                 init_ohci1394_dma_on_all_controllers();
 952 #endif
 953         /* Allocate bigger log buffer */
 954         setup_log_buf(1);
 955
 956         reserve_initrd();
 957
 958         reserve_crashkernel();
 959
 960         vsmp_init();
 961
 962         io_delay_init();
 963
 964         /*
 965          * Parse the ACPI tables for possible boot-time SMP configuration.
 966          */
 967         acpi_boot_table_init();
 968
 969         early_acpi_boot_init();
 970
 971         initmem_init();
 972         memblock_find_dma_reserve();
 973
 974 #ifdef CONFIG_KVM_CLOCK
 975         kvmclock_init();
 976 #endif
 977
 978         x86_init.paging.pagetable_setup_start(swapper_pg_dir);
 979         paging_init();
 980         x86_init.paging.pagetable_setup_done(swapper_pg_dir);
 981
 982         if (boot_cpu_data.cpuid_level >= 0) {
 983                 /* A CPU has %cr4 if and only if it has CPUID */
 984                 mmu_cr4_features = read_cr4();
 985                 if (trampoline_cr4_features)
 986                         *trampoline_cr4_features = mmu_cr4_features;
 987         }
 988
 989 #ifdef CONFIG_X86_32
 990         /* sync back kernel address range */
 991         clone_pgd_range(initial_page_table + KERNEL_PGD_BOUNDARY,
 992                         swapper_pg_dir     + KERNEL_PGD_BOUNDARY,
 993                         KERNEL_PGD_PTRS);
 994 #endif
 995
 996         tboot_probe();
 997
 998 #ifdef CONFIG_X86_64
 999         map_vsyscall();
1000 #endif
1001
1002         generic_apic_probe();
1003
1004         early_quirks();
1005
1006         /*
1007          * Read APIC and some other early information from ACPI tables.
1008          */
1009         acpi_boot_init();
1010         sfi_init();
1011         x86_dtb_init();
1012
1013         /*
1014          * get boot-time SMP configuration:
1015          */
1016         if (smp_found_config)
1017                 get_smp_config();
1018
1019         prefill_possible_map();
1020
1021         init_cpu_to_node();
1022
1023         init_apic_mappings();
1024         if (x86_io_apic_ops.init)
1025                 x86_io_apic_ops.init();
1026
1027         kvm_guest_init();
1028
1029         e820_reserve_resources();
1030         e820_mark_nosave_regions(max_low_pfn);
1031
1032         x86_init.resources.reserve_resources();
1033
1034         e820_setup_gap();
1035
1036 #ifdef CONFIG_VT
1037 #if defined(CONFIG_VGA_CONSOLE)
1038         if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
1039                 conswitchp = &vga_con;
1040 #elif defined(CONFIG_DUMMY_CONSOLE)
1041         conswitchp = &dummy_con;
1042 #endif
1043 #endif
1044         x86_init.oem.banner();
1045
1046         x86_init.timers.wallclock_init();
1047
1048         mcheck_init();
1049
1050         arch_init_ideal_nops();
1051
1052 #ifdef CONFIG_EFI
1053         /* Once setup is done above, disable efi_enabled on mismatched
1054          * firmware/kernel archtectures since there is no support for
1055          * runtime services.
1056          */
1057         if (efi_enabled && IS_ENABLED(CONFIG_X86_64) != efi_64bit) {
1058                 pr_info("efi: Setup done, disabling due to 32/64-bit mismatch\n");
1059                 efi_unmap_memmap();
1060                 efi_enabled = 0;
1061         }
1062 #endif
1063 }
1064
1065 #ifdef CONFIG_X86_32
1066
1067 static struct resource video_ram_resource = {
1068         .name   = "Video RAM area",
1069         .start  = 0xa0000,
1070         .end    = 0xbffff,
1071         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
1072 };
1073
1074 void __init i386_reserve_resources(void)
1075 {
1076         request_resource(&iomem_resource, &video_ram_resource);
1077         reserve_standard_io_resources();
1078 }
1079
1080 #endif /* CONFIG_X86_32 */