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/apm_bios.h>
  31 #include <linux/initrd.h>
  32 #include <linux/bootmem.h>
  33 #include <linux/seq_file.h>
  34 #include <linux/console.h>
  35 #include <linux/mca.h>
  36 #include <linux/root_dev.h>
  37 #include <linux/highmem.h>
  38 #include <linux/module.h>
  39 #include <linux/efi.h>
  40 #include <linux/init.h>
  41 #include <linux/edd.h>
  42 #include <linux/iscsi_ibft.h>
  43 #include <linux/nodemask.h>
  44 #include <linux/kexec.h>
  45 #include <linux/dmi.h>
  46 #include <linux/pfn.h>
  47 #include <linux/pci.h>
  48 #include <asm/pci-direct.h>
  49 #include <linux/init_ohci1394_dma.h>
  50 #include <linux/kvm_para.h>
  51
  52 #include <linux/errno.h>
  53 #include <linux/kernel.h>
  54 #include <linux/stddef.h>
  55 #include <linux/unistd.h>
  56 #include <linux/ptrace.h>
  57 #include <linux/slab.h>
  58 #include <linux/user.h>
  59 #include <linux/delay.h>
  60 #include <linux/highmem.h>
  61
  62 #include <linux/kallsyms.h>
  63 #include <linux/edd.h>
  64 #include <linux/iscsi_ibft.h>
  65 #include <linux/kexec.h>
  66 #include <linux/cpufreq.h>
  67 #include <linux/dma-mapping.h>
  68 #include <linux/ctype.h>
  69 #include <linux/uaccess.h>
  70
  71 #include <linux/percpu.h>
  72 #include <linux/crash_dump.h>
  73
  74 #include <video/edid.h>
  75
  76 #include <asm/mtrr.h>
  77 #include <asm/apic.h>
  78 #include <asm/e820.h>
  79 #include <asm/mpspec.h>
  80 #include <asm/setup.h>
  81 #include <asm/arch_hooks.h>
  82 #include <asm/efi.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/vmi.h>
  88 #include <setup_arch.h>
  89 #include <asm/bios_ebda.h>
  90 #include <asm/cacheflush.h>
  91 #include <asm/processor.h>
  92 #include <asm/bugs.h>
  93
  94 #include <asm/system.h>
  95 #include <asm/vsyscall.h>
  96 #include <asm/smp.h>
  97 #include <asm/desc.h>
  98 #include <asm/dma.h>
  99 #include <asm/gart.h>
 100 #include <asm/mmu_context.h>
 101 #include <asm/proto.h>
 102
 103 #include <mach_apic.h>
 104 #ifdef CONFIG_PARAVIRT
 105 #include <asm/paravirt.h>
 106 #else
 107 #define ARCH_SETUP
 108 #endif
 109
 110 #include <asm/percpu.h>
 111 #include <asm/sections.h>
 112 #include <asm/topology.h>
 113 #include <asm/apicdef.h>
 114 #ifdef CONFIG_X86_64
 115 #include <asm/numa_64.h>
 116 #endif
 117 #ifdef CONFIG_X86_32
 118 #include <asm/highmem.h>
 119 #endif
 120
 121 #ifndef CONFIG_DEBUG_BOOT_PARAMS
 122 struct boot_params __initdata boot_params;
 123 #else
 124 struct boot_params boot_params;
 125 #endif
 126
 127 /* This value is set up by the early boot code to point to the value
 128    immediately after the boot time page tables.  It contains a *physical*
 129    address, and must not be in the .bss segment! */
 130 unsigned long init_pg_tables_start __initdata = ~0UL;
 131 unsigned long init_pg_tables_end __initdata = ~0UL;
 132
 133 /*
 134  * Machine setup..
 135  */
 136 static struct resource data_resource = {
 137         .name   = "Kernel data",
 138         .start  = 0,
 139         .end    = 0,
 140         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
 141 };
 142
 143 static struct resource code_resource = {
 144         .name   = "Kernel code",
 145         .start  = 0,
 146         .end    = 0,
 147         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
 148 };
 149
 150 static struct resource bss_resource = {
 151         .name   = "Kernel bss",
 152         .start  = 0,
 153         .end    = 0,
 154         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
 155 };
 156
 157
 158 #ifdef CONFIG_X86_32
 159 static struct resource video_ram_resource = {
 160         .name   = "Video RAM area",
 161         .start  = 0xa0000,
 162         .end    = 0xbffff,
 163         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
 164 };
 165
 166 /* cpu data as detected by the assembly code in head.S */
 167 struct cpuinfo_x86 new_cpu_data __cpuinitdata = {0, 0, 0, 0, -1, 1, 0, 0, -1};
 168 /* common cpu data for all cpus */
 169 struct cpuinfo_x86 boot_cpu_data __read_mostly = {0, 0, 0, 0, -1, 1, 0, 0, -1};
 170 EXPORT_SYMBOL(boot_cpu_data);
 171 static void set_mca_bus(int x)
 172 {
 173 #ifdef CONFIG_MCA
 174         MCA_bus = x;
 175 #endif
 176 }
 177
 178 unsigned int def_to_bigsmp;
 179
 180 /* for MCA, but anyone else can use it if they want */
 181 unsigned int machine_id;
 182 unsigned int machine_submodel_id;
 183 unsigned int BIOS_revision;
 184
 185 struct apm_info apm_info;
 186 EXPORT_SYMBOL(apm_info);
 187
 188 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
 189         defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
 190 struct ist_info ist_info;
 191 EXPORT_SYMBOL(ist_info);
 192 #else
 193 struct ist_info ist_info;
 194 #endif
 195
 196 #else
 197 struct cpuinfo_x86 boot_cpu_data __read_mostly;
 198 EXPORT_SYMBOL(boot_cpu_data);
 199 #endif
 200
 201
 202 #if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64)
 203 unsigned long mmu_cr4_features;
 204 #else
 205 unsigned long mmu_cr4_features = X86_CR4_PAE;
 206 #endif
 207
 208 /* Boot loader ID as an integer, for the benefit of proc_dointvec */
 209 int bootloader_type;
 210
 211 /*
 212  * Early DMI memory
 213  */
 214 int dmi_alloc_index;
 215 char dmi_alloc_data[DMI_MAX_DATA];
 216
 217 /*
 218  * Setup options
 219  */
 220 struct screen_info screen_info;
 221 EXPORT_SYMBOL(screen_info);
 222 struct edid_info edid_info;
 223 EXPORT_SYMBOL_GPL(edid_info);
 224
 225 extern int root_mountflags;
 226
 227 unsigned long saved_video_mode;
 228
 229 #define RAMDISK_IMAGE_START_MASK        0x07FF
 230 #define RAMDISK_PROMPT_FLAG             0x8000
 231 #define RAMDISK_LOAD_FLAG               0x4000
 232
 233 static char __initdata command_line[COMMAND_LINE_SIZE];
 234
 235 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
 236 struct edd edd;
 237 #ifdef CONFIG_EDD_MODULE
 238 EXPORT_SYMBOL(edd);
 239 #endif
 240 /**
 241  * copy_edd() - Copy the BIOS EDD information
 242  *              from boot_params into a safe place.
 243  *
 244  */
 245 static inline void copy_edd(void)
 246 {
 247      memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer,
 248             sizeof(edd.mbr_signature));
 249      memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
 250      edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
 251      edd.edd_info_nr = boot_params.eddbuf_entries;
 252 }
 253 #else
 254 static inline void copy_edd(void)
 255 {
 256 }
 257 #endif
 258
 259 #ifdef CONFIG_BLK_DEV_INITRD
 260
 261 #ifdef CONFIG_X86_32
 262
 263 #define MAX_MAP_CHUNK   (NR_FIX_BTMAPS << PAGE_SHIFT)
 264 static void __init relocate_initrd(void)
 265 {
 266
 267         u64 ramdisk_image = boot_params.hdr.ramdisk_image;
 268         u64 ramdisk_size  = boot_params.hdr.ramdisk_size;
 269         u64 end_of_lowmem = max_low_pfn << PAGE_SHIFT;
 270         u64 ramdisk_here;
 271         unsigned long slop, clen, mapaddr;
 272         char *p, *q;
 273
 274         /* We need to move the initrd down into lowmem */
 275         ramdisk_here = find_e820_area(0, end_of_lowmem, ramdisk_size,
 276                                          PAGE_SIZE);
 277
 278         if (ramdisk_here == -1ULL)
 279                 panic("Cannot find place for new RAMDISK of size %lld\n",
 280                          ramdisk_size);
 281
 282         /* Note: this includes all the lowmem currently occupied by
 283            the initrd, we rely on that fact to keep the data intact. */
 284         reserve_early(ramdisk_here, ramdisk_here + ramdisk_size,
 285                          "NEW RAMDISK");
 286         initrd_start = ramdisk_here + PAGE_OFFSET;
 287         initrd_end   = initrd_start + ramdisk_size;
 288         printk(KERN_INFO "Allocated new RAMDISK: %08llx - %08llx\n",
 289                          ramdisk_here, ramdisk_here + ramdisk_size);
 290
 291         q = (char *)initrd_start;
 292
 293         /* Copy any lowmem portion of the initrd */
 294         if (ramdisk_image < end_of_lowmem) {
 295                 clen = end_of_lowmem - ramdisk_image;
 296                 p = (char *)__va(ramdisk_image);
 297                 memcpy(q, p, clen);
 298                 q += clen;
 299                 ramdisk_image += clen;
 300                 ramdisk_size  -= clen;
 301         }
 302
 303         /* Copy the highmem portion of the initrd */
 304         while (ramdisk_size) {
 305                 slop = ramdisk_image & ~PAGE_MASK;
 306                 clen = ramdisk_size;
 307                 if (clen > MAX_MAP_CHUNK-slop)
 308                         clen = MAX_MAP_CHUNK-slop;
 309                 mapaddr = ramdisk_image & PAGE_MASK;
 310                 p = early_ioremap(mapaddr, clen+slop);
 311                 memcpy(q, p+slop, clen);
 312                 early_iounmap(p, clen+slop);
 313                 q += clen;
 314                 ramdisk_image += clen;
 315                 ramdisk_size  -= clen;
 316         }
 317         /* high pages is not converted by early_res_to_bootmem */
 318         ramdisk_image = boot_params.hdr.ramdisk_image;
 319         ramdisk_size  = boot_params.hdr.ramdisk_size;
 320         printk(KERN_INFO "Move RAMDISK from %016llx - %016llx to"
 321                 " %08llx - %08llx\n",
 322                 ramdisk_image, ramdisk_image + ramdisk_size - 1,
 323                 ramdisk_here, ramdisk_here + ramdisk_size - 1);
 324 }
 325 #endif
 326
 327 static void __init reserve_initrd(void)
 328 {
 329         u64 ramdisk_image = boot_params.hdr.ramdisk_image;
 330         u64 ramdisk_size  = boot_params.hdr.ramdisk_size;
 331         u64 ramdisk_end   = ramdisk_image + ramdisk_size;
 332         u64 end_of_lowmem = max_low_pfn << PAGE_SHIFT;
 333
 334         if (!boot_params.hdr.type_of_loader ||
 335             !ramdisk_image || !ramdisk_size)
 336                 return;         /* No initrd provided by bootloader */
 337
 338         initrd_start = 0;
 339
 340         if (ramdisk_size >= (end_of_lowmem>>1)) {
 341                 free_early(ramdisk_image, ramdisk_end);
 342                 printk(KERN_ERR "initrd too large to handle, "
 343                        "disabling initrd\n");
 344                 return;
 345         }
 346
 347         printk(KERN_INFO "RAMDISK: %08llx - %08llx\n", ramdisk_image,
 348                         ramdisk_end);
 349
 350
 351         if (ramdisk_end <= end_of_lowmem) {
 352                 /* All in lowmem, easy case */
 353                 /*
 354                  * don't need to reserve again, already reserved early
 355                  * in i386_start_kernel
 356                  */
 357                 initrd_start = ramdisk_image + PAGE_OFFSET;
 358                 initrd_end = initrd_start + ramdisk_size;
 359                 return;
 360         }
 361
 362 #ifdef CONFIG_X86_32
 363         relocate_initrd();
 364 #else
 365         printk(KERN_ERR "initrd extends beyond end of memory "
 366                "(0x%08llx > 0x%08llx)\ndisabling initrd\n",
 367                ramdisk_end, end_of_lowmem);
 368         initrd_start = 0;
 369 #endif
 370         free_early(ramdisk_image, ramdisk_end);
 371 }
 372 #else
 373 static void __init reserve_initrd(void)
 374 {
 375 }
 376 #endif /* CONFIG_BLK_DEV_INITRD */
 377
 378 void __init parse_setup_data(void)
 379 {
 380         struct setup_data *data;
 381         u64 pa_data;
 382
 383         if (boot_params.hdr.version < 0x0209)
 384                 return;
 385         pa_data = boot_params.hdr.setup_data;
 386         while (pa_data) {
 387                 data = early_ioremap(pa_data, PAGE_SIZE);
 388                 switch (data->type) {
 389                 case SETUP_E820_EXT:
 390                         parse_e820_ext(data, pa_data);
 391                         break;
 392                 default:
 393                         break;
 394                 }
 395 #ifndef CONFIG_DEBUG_BOOT_PARAMS
 396                 free_early(pa_data, pa_data+sizeof(*data)+data->len);
 397 #endif
 398                 pa_data = data->next;
 399                 early_iounmap(data, PAGE_SIZE);
 400         }
 401 }
 402
 403 /*
 404  * --------- Crashkernel reservation ------------------------------
 405  */
 406
 407 #ifdef CONFIG_KEXEC
 408 static inline unsigned long long get_total_mem(void)
 409 {
 410         unsigned long long total;
 411
 412         total = max_low_pfn - min_low_pfn;
 413 #ifdef CONFIG_HIGHMEM
 414         total += highend_pfn - highstart_pfn;
 415 #endif
 416
 417         return total << PAGE_SHIFT;
 418 }
 419
 420 void __init reserve_crashkernel(void)
 421 {
 422         unsigned long long total_mem;
 423         unsigned long long crash_size, crash_base;
 424         int ret;
 425
 426         total_mem = get_total_mem();
 427
 428         ret = parse_crashkernel(boot_command_line, total_mem,
 429                         &crash_size, &crash_base);
 430         if (ret == 0 && crash_size > 0) {
 431                 if (crash_base <= 0) {
 432                         printk(KERN_INFO "crashkernel reservation failed - "
 433                                         "you have to specify a base address\n");
 434                         return;
 435                 }
 436
 437                 if (reserve_bootmem_generic(crash_base, crash_size,
 438                                         BOOTMEM_EXCLUSIVE) < 0) {
 439                         printk(KERN_INFO "crashkernel reservation failed - "
 440                                         "memory is in use\n");
 441                         return;
 442                 }
 443
 444                 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
 445                                 "for crashkernel (System RAM: %ldMB)\n",
 446                                 (unsigned long)(crash_size >> 20),
 447                                 (unsigned long)(crash_base >> 20),
 448                                 (unsigned long)(total_mem >> 20));
 449
 450                 crashk_res.start = crash_base;
 451                 crashk_res.end   = crash_base + crash_size - 1;
 452                 insert_resource(&iomem_resource, &crashk_res);
 453         }
 454 }
 455 #else
 456 void __init reserve_crashkernel(void)
 457 {
 458 }
 459 #endif
 460
 461 static struct resource standard_io_resources[] = {
 462         { .name = "dma1", .start = 0x00, .end = 0x1f,
 463                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 464         { .name = "pic1", .start = 0x20, .end = 0x21,
 465                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 466         { .name = "timer0", .start = 0x40, .end = 0x43,
 467                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 468         { .name = "timer1", .start = 0x50, .end = 0x53,
 469                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 470         { .name = "keyboard", .start = 0x60, .end = 0x60,
 471                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 472         { .name = "keyboard", .start = 0x64, .end = 0x64,
 473                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 474         { .name = "dma page reg", .start = 0x80, .end = 0x8f,
 475                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 476         { .name = "pic2", .start = 0xa0, .end = 0xa1,
 477                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 478         { .name = "dma2", .start = 0xc0, .end = 0xdf,
 479                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 480         { .name = "fpu", .start = 0xf0, .end = 0xff,
 481                 .flags = IORESOURCE_BUSY | IORESOURCE_IO }
 482 };
 483
 484 void __init reserve_standard_io_resources(void)
 485 {
 486         int i;
 487
 488         /* request I/O space for devices used on all i[345]86 PCs */
 489         for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
 490                 request_resource(&ioport_resource, &standard_io_resources[i]);
 491
 492 }
 493
 494 /*
 495  * Determine if we were loaded by an EFI loader.  If so, then we have also been
 496  * passed the efi memmap, systab, etc., so we should use these data structures
 497  * for initialization.  Note, the efi init code path is determined by the
 498  * global efi_enabled. This allows the same kernel image to be used on existing
 499  * systems (with a traditional BIOS) as well as on EFI systems.
 500  */
 501 /*
 502  * setup_arch - architecture-specific boot-time initializations
 503  *
 504  * Note: On x86_64, fixmaps are ready for use even before this is called.
 505  */
 506
 507 void __init setup_arch(char **cmdline_p)
 508 {
 509 #ifdef CONFIG_X86_32
 510         memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
 511         pre_setup_arch_hook();
 512         early_cpu_init();
 513         early_ioremap_init();
 514         reserve_setup_data();
 515 #else
 516         printk(KERN_INFO "Command line: %s\n", boot_command_line);
 517 #endif
 518
 519         ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
 520         screen_info = boot_params.screen_info;
 521         edid_info = boot_params.edid_info;
 522 #ifdef CONFIG_X86_32
 523         apm_info.bios = boot_params.apm_bios_info;
 524         ist_info = boot_params.ist_info;
 525         if (boot_params.sys_desc_table.length != 0) {
 526                 set_mca_bus(boot_params.sys_desc_table.table[3] & 0x2);
 527                 machine_id = boot_params.sys_desc_table.table[0];
 528                 machine_submodel_id = boot_params.sys_desc_table.table[1];
 529                 BIOS_revision = boot_params.sys_desc_table.table[2];
 530         }
 531 #endif
 532         saved_video_mode = boot_params.hdr.vid_mode;
 533         bootloader_type = boot_params.hdr.type_of_loader;
 534
 535 #ifdef CONFIG_BLK_DEV_RAM
 536         rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
 537         rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
 538         rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
 539 #endif
 540 #ifdef CONFIG_EFI
 541         if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
 542 #ifdef CONFIG_X86_32
 543                      "EL32",
 544 #else
 545                      "EL64",
 546 #endif
 547          4)) {
 548                 efi_enabled = 1;
 549                 efi_reserve_early();
 550         }
 551 #endif
 552
 553         ARCH_SETUP
 554
 555         setup_memory_map();
 556         copy_edd();
 557
 558         if (!boot_params.hdr.root_flags)
 559                 root_mountflags &= ~MS_RDONLY;
 560         init_mm.start_code = (unsigned long) _text;
 561         init_mm.end_code = (unsigned long) _etext;
 562         init_mm.end_data = (unsigned long) _edata;
 563 #ifdef CONFIG_X86_32
 564         init_mm.brk = init_pg_tables_end + PAGE_OFFSET;
 565 #else
 566         init_mm.brk = (unsigned long) &_end;
 567 #endif
 568
 569         code_resource.start = virt_to_phys(_text);
 570         code_resource.end = virt_to_phys(_etext)-1;
 571         data_resource.start = virt_to_phys(_etext);
 572         data_resource.end = virt_to_phys(_edata)-1;
 573         bss_resource.start = virt_to_phys(&__bss_start);
 574         bss_resource.end = virt_to_phys(&__bss_stop)-1;
 575
 576 #ifdef CONFIG_X86_64
 577         early_cpu_init();
 578 #endif
 579         strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
 580         *cmdline_p = command_line;
 581
 582         parse_setup_data();
 583
 584         parse_early_param();
 585
 586         if (acpi_mps_check()) {
 587 #ifdef CONFIG_X86_LOCAL_APIC
 588 #ifdef CONFIG_X86_32
 589                 enable_local_apic = -1;
 590 #else
 591                 disable_apic = 1;
 592 #endif
 593 #endif
 594                 clear_cpu_cap(&boot_cpu_data, X86_FEATURE_APIC);
 595         }
 596
 597         finish_e820_parsing();
 598
 599 #ifdef CONFIG_X86_32
 600         probe_roms();
 601 #else
 602 # ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
 603         if (init_ohci1394_dma_early)
 604                 init_ohci1394_dma_on_all_controllers();
 605 # endif
 606 #endif
 607
 608         /* after parse_early_param, so could debug it */
 609         insert_resource(&iomem_resource, &code_resource);
 610         insert_resource(&iomem_resource, &data_resource);
 611         insert_resource(&iomem_resource, &bss_resource);
 612
 613         if (efi_enabled)
 614                 efi_init();
 615
 616 #ifdef CONFIG_X86_32
 617         if (ppro_with_ram_bug()) {
 618                 e820_update_range(0x70000000ULL, 0x40000ULL, E820_RAM,
 619                                   E820_RESERVED);
 620                 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 621                 printk(KERN_INFO "fixed physical RAM map:\n");
 622                 e820_print_map("bad_ppro");
 623         }
 624 #else
 625         early_gart_iommu_check();
 626 #endif
 627
 628         e820_register_active_regions(0, 0, -1UL);
 629         /*
 630          * partially used pages are not usable - thus
 631          * we are rounding upwards:
 632          */
 633         max_pfn = e820_end_of_ram();
 634
 635         /* preallocate 4k for mptable mpc */
 636         early_reserve_e820_mpc_new();
 637         /* update e820 for memory not covered by WB MTRRs */
 638         mtrr_bp_init();
 639         if (mtrr_trim_uncached_memory(max_pfn)) {
 640                 remove_all_active_ranges();
 641                 e820_register_active_regions(0, 0, -1UL);
 642                 max_pfn = e820_end_of_ram();
 643         }
 644
 645 #ifdef CONFIG_X86_32
 646         /* max_low_pfn get updated here */
 647         find_low_pfn_range();
 648 #else
 649         num_physpages = max_pfn;
 650
 651         check_efer();
 652
 653         /* How many end-of-memory variables you have, grandma! */
 654         /* need this before calling reserve_initrd */
 655         max_low_pfn = max_pfn;
 656         high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
 657 #endif
 658
 659         /* max_pfn_mapped is updated here */
 660         max_pfn_mapped = init_memory_mapping(0, (max_low_pfn << PAGE_SHIFT));
 661
 662         reserve_initrd();
 663
 664 #ifdef CONFIG_X86_64
 665         vsmp_init();
 666 #endif
 667
 668         dmi_scan_machine();
 669
 670         io_delay_init();
 671
 672         /*
 673          * Parse the ACPI tables for possible boot-time SMP configuration.
 674          */
 675         acpi_boot_table_init();
 676
 677 #ifdef CONFIG_X86_64
 678         /* Remove active ranges so rediscovery with NUMA-awareness happens */
 679         remove_all_active_ranges();
 680 #endif
 681
 682 #ifdef CONFIG_ACPI_NUMA
 683         /*
 684          * Parse SRAT to discover nodes.
 685          */
 686         acpi_numa_init();
 687 #endif
 688
 689         initmem_init(0, max_pfn);
 690
 691 #ifdef CONFIG_X86_64
 692         dma32_reserve_bootmem();
 693 #endif
 694
 695 #ifdef CONFIG_ACPI_SLEEP
 696         /*
 697          * Reserve low memory region for sleep support.
 698          */
 699         acpi_reserve_bootmem();
 700 #endif
 701 #if defined(CONFIG_X86_FIND_SMP_CONFIG) && defined(CONFIG_X86_32) || \
 702     defined(CONFIG_X86_MPPARSE) && defined(CONFIG_X86_64)
 703         /*
 704          * Find and reserve possible boot-time SMP configuration:
 705          */
 706         find_smp_config();
 707 #endif
 708         reserve_crashkernel();
 709
 710         reserve_ibft_region();
 711
 712 #ifdef CONFIG_KVM_CLOCK
 713         kvmclock_init();
 714 #endif
 715
 716 #if defined(CONFIG_VMI) && defined(CONFIG_X86_32)
 717         /*
 718          * Must be after max_low_pfn is determined, and before kernel
 719          * pagetables are setup.
 720          */
 721         vmi_init();
 722 #endif
 723
 724         paging_init();
 725
 726 #ifdef CONFIG_X86_64
 727         map_vsyscall();
 728 #endif
 729
 730         /*
 731          * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
 732          */
 733
 734 #if defined(CONFIG_PROVIDE_OHCI1394_DMA_INIT) && defined(CONFIG_X86_32)
 735         if (init_ohci1394_dma_early)
 736                 init_ohci1394_dma_on_all_controllers();
 737 #endif
 738
 739 #ifdef CONFIG_X86_GENERICARCH
 740         generic_apic_probe();
 741 #endif
 742
 743         early_quirks();
 744
 745         /*
 746          * Read APIC and some other early information from ACPI tables.
 747          */
 748         acpi_boot_init();
 749
 750 #ifdef CONFIG_X86_64
 751         init_cpu_to_node();
 752 #endif
 753
 754 #if defined(CONFIG_X86_MPPARSE) || defined(CONFIG_X86_VISWS)
 755         /*
 756          * get boot-time SMP configuration:
 757          */
 758         if (smp_found_config)
 759                 get_smp_config();
 760 #endif
 761
 762 #ifdef CONFIG_X86_64
 763         init_apic_mappings();
 764         ioapic_init_mappings();
 765 #else
 766 # if defined(CONFIG_SMP) && defined(CONFIG_X86_PC)
 767         if (def_to_bigsmp)
 768                 printk(KERN_WARNING "More than 8 CPUs detected and "
 769                         "CONFIG_X86_PC cannot handle it.\nUse "
 770                         "CONFIG_X86_GENERICARCH or CONFIG_X86_BIGSMP.\n");
 771 # endif
 772 #endif
 773         kvm_guest_init();
 774
 775         e820_reserve_resources();
 776         e820_mark_nosave_regions(max_low_pfn);
 777
 778 #ifdef CONFIG_X86_32
 779         request_resource(&iomem_resource, &video_ram_resource);
 780 #endif
 781         reserve_standard_io_resources();
 782
 783         e820_setup_gap();
 784
 785 #ifdef CONFIG_VT
 786 #if defined(CONFIG_VGA_CONSOLE)
 787         if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
 788                 conswitchp = &vga_con;
 789 #elif defined(CONFIG_DUMMY_CONSOLE)
 790         conswitchp = &dummy_con;
 791 #endif
 792 #endif
 793 }
 794