arch/x86/kernel/setup_32.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 <linux/init_ohci1394_dma.h>
  49 #include <linux/kvm_para.h>
  50
  51 #include <video/edid.h>
  52
  53 #include <asm/mtrr.h>
  54 #include <asm/apic.h>
  55 #include <asm/e820.h>
  56 #include <asm/mpspec.h>
  57 #include <asm/mmzone.h>
  58 #include <asm/setup.h>
  59 #include <asm/arch_hooks.h>
  60 #include <asm/sections.h>
  61 #include <asm/dmi.h>
  62 #include <asm/io_apic.h>
  63 #include <asm/ist.h>
  64 #include <asm/io.h>
  65 #include <asm/vmi.h>
  66 #include <setup_arch.h>
  67 #include <asm/bios_ebda.h>
  68 #include <asm/cacheflush.h>
  69 #include <asm/processor.h>
  70 #include <asm/efi.h>
  71 #include <asm/bugs.h>
  72
  73 /* This value is set up by the early boot code to point to the value
  74    immediately after the boot time page tables.  It contains a *physical*
  75    address, and must not be in the .bss segment! */
  76 unsigned long init_pg_tables_start __initdata = ~0UL;
  77 unsigned long init_pg_tables_end __initdata = ~0UL;
  78
  79 /*
  80  * Machine setup..
  81  */
  82 static struct resource data_resource = {
  83         .name   = "Kernel data",
  84         .start  = 0,
  85         .end    = 0,
  86         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
  87 };
  88
  89 static struct resource code_resource = {
  90         .name   = "Kernel code",
  91         .start  = 0,
  92         .end    = 0,
  93         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
  94 };
  95
  96 static struct resource bss_resource = {
  97         .name   = "Kernel bss",
  98         .start  = 0,
  99         .end    = 0,
 100         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
 101 };
 102
 103 static struct resource video_ram_resource = {
 104         .name   = "Video RAM area",
 105         .start  = 0xa0000,
 106         .end    = 0xbffff,
 107         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
 108 };
 109
 110 /* cpu data as detected by the assembly code in head.S */
 111 struct cpuinfo_x86 new_cpu_data __cpuinitdata = { 0, 0, 0, 0, -1, 1, 0, 0, -1 };
 112 /* common cpu data for all cpus */
 113 struct cpuinfo_x86 boot_cpu_data __read_mostly = { 0, 0, 0, 0, -1, 1, 0, 0, -1 };
 114 EXPORT_SYMBOL(boot_cpu_data);
 115
 116 unsigned int def_to_bigsmp;
 117
 118 #ifndef CONFIG_X86_PAE
 119 unsigned long mmu_cr4_features;
 120 #else
 121 unsigned long mmu_cr4_features = X86_CR4_PAE;
 122 #endif
 123
 124 /* for MCA, but anyone else can use it if they want */
 125 unsigned int machine_id;
 126 unsigned int machine_submodel_id;
 127 unsigned int BIOS_revision;
 128
 129 /* Boot loader ID as an integer, for the benefit of proc_dointvec */
 130 int bootloader_type;
 131
 132 /*
 133  * Early DMI memory
 134  */
 135 int dmi_alloc_index;
 136 char dmi_alloc_data[DMI_MAX_DATA];
 137
 138 /*
 139  * Setup options
 140  */
 141 struct screen_info screen_info;
 142 EXPORT_SYMBOL(screen_info);
 143 struct apm_info apm_info;
 144 EXPORT_SYMBOL(apm_info);
 145 struct edid_info edid_info;
 146 EXPORT_SYMBOL_GPL(edid_info);
 147 struct ist_info ist_info;
 148 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
 149         defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
 150 EXPORT_SYMBOL(ist_info);
 151 #endif
 152
 153 extern int root_mountflags;
 154
 155 unsigned long saved_video_mode;
 156
 157 #define RAMDISK_IMAGE_START_MASK        0x07FF
 158 #define RAMDISK_PROMPT_FLAG             0x8000
 159 #define RAMDISK_LOAD_FLAG               0x4000
 160
 161 static char __initdata command_line[COMMAND_LINE_SIZE];
 162
 163 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
 164 struct edd edd;
 165 #ifdef CONFIG_EDD_MODULE
 166 EXPORT_SYMBOL(edd);
 167 #endif
 168 /**
 169  * copy_edd() - Copy the BIOS EDD information
 170  *              from boot_params into a safe place.
 171  *
 172  */
 173 static inline void copy_edd(void)
 174 {
 175      memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer,
 176             sizeof(edd.mbr_signature));
 177      memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
 178      edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
 179      edd.edd_info_nr = boot_params.eddbuf_entries;
 180 }
 181 #else
 182 static inline void copy_edd(void)
 183 {
 184 }
 185 #endif
 186
 187 #ifdef CONFIG_BLK_DEV_INITRD
 188
 189 #ifdef CONFIG_X86_32
 190
 191 #define MAX_MAP_CHUNK   (NR_FIX_BTMAPS << PAGE_SHIFT)
 192 static void __init relocate_initrd(void)
 193 {
 194
 195         u64 ramdisk_image = boot_params.hdr.ramdisk_image;
 196         u64 ramdisk_size  = boot_params.hdr.ramdisk_size;
 197         u64 end_of_lowmem = max_low_pfn << PAGE_SHIFT;
 198         u64 ramdisk_here;
 199         unsigned long slop, clen, mapaddr;
 200         char *p, *q;
 201
 202         /* We need to move the initrd down into lowmem */
 203         ramdisk_here = find_e820_area(0, end_of_lowmem, ramdisk_size,
 204                                          PAGE_SIZE);
 205
 206         if (ramdisk_here == -1ULL)
 207                 panic("Cannot find place for new RAMDISK of size %lld\n",
 208                          ramdisk_size);
 209
 210         /* Note: this includes all the lowmem currently occupied by
 211            the initrd, we rely on that fact to keep the data intact. */
 212         reserve_early(ramdisk_here, ramdisk_here + ramdisk_size,
 213                          "NEW RAMDISK");
 214         initrd_start = ramdisk_here + PAGE_OFFSET;
 215         initrd_end   = initrd_start + ramdisk_size;
 216         printk(KERN_INFO "Allocated new RAMDISK: %08llx - %08llx\n",
 217                          ramdisk_here, ramdisk_here + ramdisk_size);
 218
 219         q = (char *)initrd_start;
 220
 221         /* Copy any lowmem portion of the initrd */
 222         if (ramdisk_image < end_of_lowmem) {
 223                 clen = end_of_lowmem - ramdisk_image;
 224                 p = (char *)__va(ramdisk_image);
 225                 memcpy(q, p, clen);
 226                 q += clen;
 227                 ramdisk_image += clen;
 228                 ramdisk_size  -= clen;
 229         }
 230
 231         /* Copy the highmem portion of the initrd */
 232         while (ramdisk_size) {
 233                 slop = ramdisk_image & ~PAGE_MASK;
 234                 clen = ramdisk_size;
 235                 if (clen > MAX_MAP_CHUNK-slop)
 236                         clen = MAX_MAP_CHUNK-slop;
 237                 mapaddr = ramdisk_image & PAGE_MASK;
 238                 p = early_ioremap(mapaddr, clen+slop);
 239                 memcpy(q, p+slop, clen);
 240                 early_iounmap(p, clen+slop);
 241                 q += clen;
 242                 ramdisk_image += clen;
 243                 ramdisk_size  -= clen;
 244         }
 245         /* high pages is not converted by early_res_to_bootmem */
 246         ramdisk_image = boot_params.hdr.ramdisk_image;
 247         ramdisk_size  = boot_params.hdr.ramdisk_size;
 248         printk(KERN_INFO "Move RAMDISK from %016llx - %016llx to"
 249                 " %08llx - %08llx\n",
 250                 ramdisk_image, ramdisk_image + ramdisk_size - 1,
 251                 ramdisk_here, ramdisk_here + ramdisk_size - 1);
 252 }
 253 #endif
 254
 255 static void __init reserve_initrd(void)
 256 {
 257         u64 ramdisk_image = boot_params.hdr.ramdisk_image;
 258         u64 ramdisk_size  = boot_params.hdr.ramdisk_size;
 259         u64 ramdisk_end   = ramdisk_image + ramdisk_size;
 260         u64 end_of_lowmem = max_low_pfn << PAGE_SHIFT;
 261
 262         if (!boot_params.hdr.type_of_loader ||
 263             !ramdisk_image || !ramdisk_size)
 264                 return;         /* No initrd provided by bootloader */
 265
 266         initrd_start = 0;
 267
 268         if (ramdisk_size >= (end_of_lowmem>>1)) {
 269                 free_early(ramdisk_image, ramdisk_end);
 270                 printk(KERN_ERR "initrd too large to handle, "
 271                        "disabling initrd\n");
 272                 return;
 273         }
 274
 275         printk(KERN_INFO "RAMDISK: %08llx - %08llx\n", ramdisk_image,
 276                         ramdisk_end);
 277
 278
 279         if (ramdisk_end <= end_of_lowmem) {
 280                 /* All in lowmem, easy case */
 281                 /*
 282                  * don't need to reserve again, already reserved early
 283                  * in i386_start_kernel
 284                  */
 285                 initrd_start = ramdisk_image + PAGE_OFFSET;
 286                 initrd_end = initrd_start + ramdisk_size;
 287                 return;
 288         }
 289
 290 #ifdef CONFIG_X86_32
 291         relocate_initrd();
 292 #else
 293         printk(KERN_ERR "initrd extends beyond end of memory "
 294                "(0x%08llx > 0x%08llx)\ndisabling initrd\n",
 295                ramdisk_end, end_of_lowmem);
 296         initrd_start = 0;
 297 #endif
 298         free_early(ramdisk_image, ramdisk_end);
 299 }
 300 #else
 301 static void __init reserve_initrd(void)
 302 {
 303 }
 304 #endif /* CONFIG_BLK_DEV_INITRD */
 305
 306 #ifdef CONFIG_MCA
 307 static void set_mca_bus(int x)
 308 {
 309         MCA_bus = x;
 310 }
 311 #else
 312 static void set_mca_bus(int x) { }
 313 #endif
 314
 315 /*
 316  * Determine if we were loaded by an EFI loader.  If so, then we have also been
 317  * passed the efi memmap, systab, etc., so we should use these data structures
 318  * for initialization.  Note, the efi init code path is determined by the
 319  * global efi_enabled. This allows the same kernel image to be used on existing
 320  * systems (with a traditional BIOS) as well as on EFI systems.
 321  */
 322 void __init setup_arch(char **cmdline_p)
 323 {
 324         memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
 325         pre_setup_arch_hook();
 326         early_cpu_init();
 327         early_ioremap_init();
 328         reserve_setup_data();
 329
 330         ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
 331         screen_info = boot_params.screen_info;
 332         edid_info = boot_params.edid_info;
 333         apm_info.bios = boot_params.apm_bios_info;
 334         ist_info = boot_params.ist_info;
 335         saved_video_mode = boot_params.hdr.vid_mode;
 336         if( boot_params.sys_desc_table.length != 0 ) {
 337                 set_mca_bus(boot_params.sys_desc_table.table[3] & 0x2);
 338                 machine_id = boot_params.sys_desc_table.table[0];
 339                 machine_submodel_id = boot_params.sys_desc_table.table[1];
 340                 BIOS_revision = boot_params.sys_desc_table.table[2];
 341         }
 342         bootloader_type = boot_params.hdr.type_of_loader;
 343
 344 #ifdef CONFIG_BLK_DEV_RAM
 345         rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
 346         rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
 347         rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
 348 #endif
 349 #ifdef CONFIG_EFI
 350         if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
 351                      "EL32", 4)) {
 352                 efi_enabled = 1;
 353                 efi_reserve_early();
 354         }
 355 #endif
 356
 357         ARCH_SETUP
 358
 359         setup_memory_map();
 360         copy_edd();
 361
 362         if (!boot_params.hdr.root_flags)
 363                 root_mountflags &= ~MS_RDONLY;
 364         init_mm.start_code = (unsigned long) _text;
 365         init_mm.end_code = (unsigned long) _etext;
 366         init_mm.end_data = (unsigned long) _edata;
 367         init_mm.brk = init_pg_tables_end + PAGE_OFFSET;
 368
 369         code_resource.start = virt_to_phys(_text);
 370         code_resource.end = virt_to_phys(_etext)-1;
 371         data_resource.start = virt_to_phys(_etext);
 372         data_resource.end = virt_to_phys(_edata)-1;
 373         bss_resource.start = virt_to_phys(&__bss_start);
 374         bss_resource.end = virt_to_phys(&__bss_stop)-1;
 375
 376         strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
 377         *cmdline_p = command_line;
 378
 379         parse_setup_data();
 380
 381         parse_early_param();
 382
 383         if (acpi_mps_check()){
 384 #ifdef CONFIG_X86_LOCAL_APIC
 385                 enable_local_apic = -1;
 386 #endif
 387                 clear_cpu_cap(&boot_cpu_data, X86_FEATURE_APIC);
 388         }
 389
 390         finish_e820_parsing();
 391
 392         probe_roms();
 393
 394         /* after parse_early_param, so could debug it */
 395         insert_resource(&iomem_resource, &code_resource);
 396         insert_resource(&iomem_resource, &data_resource);
 397         insert_resource(&iomem_resource, &bss_resource);
 398
 399         if (efi_enabled)
 400                 efi_init();
 401
 402         if (ppro_with_ram_bug()) {
 403                 e820_update_range(0x70000000ULL, 0x40000ULL, E820_RAM,
 404                                   E820_RESERVED);
 405                 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 406                 printk(KERN_INFO "fixed physical RAM map:\n");
 407                 e820_print_map("bad_ppro");
 408         }
 409
 410         e820_register_active_regions(0, 0, -1UL);
 411         /*
 412          * partially used pages are not usable - thus
 413          * we are rounding upwards:
 414          */
 415         max_pfn = e820_end_of_ram();
 416
 417         /* preallocate 4k for mptable mpc */
 418         early_reserve_e820_mpc_new();
 419         /* update e820 for memory not covered by WB MTRRs */
 420         mtrr_bp_init();
 421         if (mtrr_trim_uncached_memory(max_pfn)) {
 422                 remove_all_active_ranges();
 423                 e820_register_active_regions(0, 0, -1UL);
 424                 max_pfn = e820_end_of_ram();
 425         }
 426
 427         /* max_low_pfn get updated here */
 428         find_low_pfn_range();
 429
 430         /* max_pfn_mapped is updated here */
 431         max_pfn_mapped = init_memory_mapping(0, (max_low_pfn << PAGE_SHIFT));
 432
 433         reserve_initrd();
 434
 435         dmi_scan_machine();
 436
 437         io_delay_init();
 438
 439         /*
 440          * Parse the ACPI tables for possible boot-time SMP configuration.
 441          */
 442         acpi_boot_table_init();
 443
 444 #ifdef CONFIG_ACPI_NUMA
 445         /*
 446          * Parse SRAT to discover nodes.
 447          */
 448         acpi_numa_init();
 449 #endif
 450
 451         initmem_init(0, max_pfn);
 452
 453 #ifdef CONFIG_ACPI_SLEEP
 454         /*
 455          * Reserve low memory region for sleep support.
 456          */
 457         acpi_reserve_bootmem();
 458 #endif
 459 #ifdef CONFIG_X86_FIND_SMP_CONFIG
 460         /*
 461          * Find and reserve possible boot-time SMP configuration:
 462          */
 463         find_smp_config();
 464 #endif
 465         reserve_crashkernel();
 466
 467         reserve_ibft_region();
 468
 469 #ifdef CONFIG_KVM_CLOCK
 470         kvmclock_init();
 471 #endif
 472
 473 #ifdef CONFIG_VMI
 474         /*
 475          * Must be after max_low_pfn is determined, and before kernel
 476          * pagetables are setup.
 477          */
 478         vmi_init();
 479 #endif
 480
 481         paging_init();
 482
 483         /*
 484          * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
 485          */
 486
 487 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
 488         if (init_ohci1394_dma_early)
 489                 init_ohci1394_dma_on_all_controllers();
 490 #endif
 491
 492 #ifdef CONFIG_X86_GENERICARCH
 493         generic_apic_probe();
 494 #endif
 495
 496         early_quirks();
 497
 498         /*
 499          * Read APIC and some other early information from ACPI tables.
 500          */
 501         acpi_boot_init();
 502
 503 #if defined(CONFIG_X86_MPPARSE) || defined(CONFIG_X86_VISWS)
 504         /*
 505          * get boot-time SMP configuration:
 506          */
 507         if (smp_found_config)
 508                 get_smp_config();
 509 #endif
 510 #if defined(CONFIG_SMP) && defined(CONFIG_X86_PC)
 511         if (def_to_bigsmp)
 512                 printk(KERN_WARNING "More than 8 CPUs detected and "
 513                         "CONFIG_X86_PC cannot handle it.\nUse "
 514                         "CONFIG_X86_GENERICARCH or CONFIG_X86_BIGSMP.\n");
 515 #endif
 516         kvm_guest_init();
 517
 518         e820_reserve_resources();
 519         e820_mark_nosave_regions(max_low_pfn);
 520
 521         request_resource(&iomem_resource, &video_ram_resource);
 522         reserve_standard_io_resources();
 523
 524         e820_setup_gap();
 525
 526 #ifdef CONFIG_VT
 527 #if defined(CONFIG_VGA_CONSOLE)
 528         if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
 529                 conswitchp = &vga_con;
 530 #elif defined(CONFIG_DUMMY_CONSOLE)
 531         conswitchp = &dummy_con;
 532 #endif
 533 #endif
 534 }
 535