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/seq_file.h> 35 #include <linux/console.h> 36 #include <linux/mca.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 53 #include <linux/errno.h> 54 #include <linux/kernel.h> 55 #include <linux/stddef.h> 56 #include <linux/unistd.h> 57 #include <linux/ptrace.h> 58 #include <linux/user.h> 59 #include <linux/delay.h> 60 61 #include <linux/kallsyms.h> 62 #include <linux/cpufreq.h> 63 #include <linux/dma-mapping.h> 64 #include <linux/ctype.h> 65 #include <linux/uaccess.h> 66 67 #include <linux/percpu.h> 68 #include <linux/crash_dump.h> 69 #include <linux/tboot.h> 70 71 #include <video/edid.h> 72 73 #include <asm/mtrr.h> 74 #include <asm/apic.h> 75 #include <asm/trampoline.h> 76 #include <asm/e820.h> 77 #include <asm/mpspec.h> 78 #include <asm/setup.h> 79 #include <asm/efi.h> 80 #include <asm/timer.h> 81 #include <asm/i8259.h> 82 #include <asm/sections.h> 83 #include <asm/dmi.h> 84 #include <asm/io_apic.h> 85 #include <asm/ist.h> 86 #include <asm/vmi.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/system.h> 94 #include <asm/vsyscall.h> 95 #include <asm/cpu.h> 96 #include <asm/desc.h> 97 #include <asm/dma.h> 98 #include <asm/iommu.h> 99 #include <asm/gart.h> 100 #include <asm/mmu_context.h> 101 #include <asm/proto.h> 102 103 #include <asm/paravirt.h> 104 #include <asm/hypervisor.h> 105 106 #include <asm/percpu.h> 107 #include <asm/topology.h> 108 #include <asm/apicdef.h> 109 #include <asm/k8.h> 110 #ifdef CONFIG_X86_64 111 #include <asm/numa_64.h> 112 #endif 113 #include <asm/mce.h> 114 115 /* 116 * end_pfn only includes RAM, while max_pfn_mapped includes all e820 entries. 117 * The direct mapping extends to max_pfn_mapped, so that we can directly access 118 * apertures, ACPI and other tables without having to play with fixmaps. 119 */ 120 unsigned long max_low_pfn_mapped; 121 unsigned long max_pfn_mapped; 122 123 #ifdef CONFIG_DMI 124 RESERVE_BRK(dmi_alloc, 65536); 125 #endif 126 127 unsigned int boot_cpu_id __read_mostly; 128 129 static __initdata unsigned long _brk_start = (unsigned long)__brk_base; 130 unsigned long _brk_end = (unsigned long)__brk_base; 131 132 #ifdef CONFIG_X86_64 133 int default_cpu_present_to_apicid(int mps_cpu) 134 { 135 return __default_cpu_present_to_apicid(mps_cpu); 136 } 137 138 int default_check_phys_apicid_present(int phys_apicid) 139 { 140 return __default_check_phys_apicid_present(phys_apicid); 141 } 142 #endif 143 144 #ifndef CONFIG_DEBUG_BOOT_PARAMS 145 struct boot_params __initdata boot_params; 146 #else 147 struct boot_params boot_params; 148 #endif 149 150 /* 151 * Machine setup.. 152 */ 153 static struct resource data_resource = { 154 .name = "Kernel data", 155 .start = 0, 156 .end = 0, 157 .flags = IORESOURCE_BUSY | IORESOURCE_MEM 158 }; 159 160 static struct resource code_resource = { 161 .name = "Kernel code", 162 .start = 0, 163 .end = 0, 164 .flags = IORESOURCE_BUSY | IORESOURCE_MEM 165 }; 166 167 static struct resource bss_resource = { 168 .name = "Kernel bss", 169 .start = 0, 170 .end = 0, 171 .flags = IORESOURCE_BUSY | IORESOURCE_MEM 172 }; 173 174 175 #ifdef CONFIG_X86_32 176 /* cpu data as detected by the assembly code in head.S */ 177 struct cpuinfo_x86 new_cpu_data __cpuinitdata = {0, 0, 0, 0, -1, 1, 0, 0, -1}; 178 /* common cpu data for all cpus */ 179 struct cpuinfo_x86 boot_cpu_data __read_mostly = {0, 0, 0, 0, -1, 1, 0, 0, -1}; 180 EXPORT_SYMBOL(boot_cpu_data); 181 static void set_mca_bus(int x) 182 { 183 #ifdef CONFIG_MCA 184 MCA_bus = x; 185 #endif 186 } 187 188 unsigned int def_to_bigsmp; 189 190 /* for MCA, but anyone else can use it if they want */ 191 unsigned int machine_id; 192 unsigned int machine_submodel_id; 193 unsigned int BIOS_revision; 194 195 struct apm_info apm_info; 196 EXPORT_SYMBOL(apm_info); 197 198 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \ 199 defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE) 200 struct ist_info ist_info; 201 EXPORT_SYMBOL(ist_info); 202 #else 203 struct ist_info ist_info; 204 #endif 205 206 #else 207 struct cpuinfo_x86 boot_cpu_data __read_mostly = { 208 .x86_phys_bits = MAX_PHYSMEM_BITS, 209 }; 210 EXPORT_SYMBOL(boot_cpu_data); 211 #endif 212 213 214 #if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64) 215 unsigned long mmu_cr4_features; 216 #else 217 unsigned long mmu_cr4_features = X86_CR4_PAE; 218 #endif 219 220 /* Boot loader ID and version as integers, for the benefit of proc_dointvec */ 221 int bootloader_type, bootloader_version; 222 223 /* 224 * Setup options 225 */ 226 struct screen_info screen_info; 227 EXPORT_SYMBOL(screen_info); 228 struct edid_info edid_info; 229 EXPORT_SYMBOL_GPL(edid_info); 230 231 extern int root_mountflags; 232 233 unsigned long saved_video_mode; 234 235 #define RAMDISK_IMAGE_START_MASK 0x07FF 236 #define RAMDISK_PROMPT_FLAG 0x8000 237 #define RAMDISK_LOAD_FLAG 0x4000 238 239 static char __initdata command_line[COMMAND_LINE_SIZE]; 240 #ifdef CONFIG_CMDLINE_BOOL 241 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE; 242 #endif 243 244 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE) 245 struct edd edd; 246 #ifdef CONFIG_EDD_MODULE 247 EXPORT_SYMBOL(edd); 248 #endif 249 /** 250 * copy_edd() - Copy the BIOS EDD information 251 * from boot_params into a safe place. 252 * 253 */ 254 static inline void __init copy_edd(void) 255 { 256 memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer, 257 sizeof(edd.mbr_signature)); 258 memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info)); 259 edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries; 260 edd.edd_info_nr = boot_params.eddbuf_entries; 261 } 262 #else 263 static inline void __init copy_edd(void) 264 { 265 } 266 #endif 267 268 void * __init extend_brk(size_t size, size_t align) 269 { 270 size_t mask = align - 1; 271 void *ret; 272 273 BUG_ON(_brk_start == 0); 274 BUG_ON(align & mask); 275 276 _brk_end = (_brk_end + mask) & ~mask; 277 BUG_ON((char *)(_brk_end + size) > __brk_limit); 278 279 ret = (void *)_brk_end; 280 _brk_end += size; 281 282 memset(ret, 0, size); 283 284 return ret; 285 } 286 287 #ifdef CONFIG_X86_64 288 static void __init init_gbpages(void) 289 { 290 if (direct_gbpages && cpu_has_gbpages) 291 printk(KERN_INFO "Using GB pages for direct mapping\n"); 292 else 293 direct_gbpages = 0; 294 } 295 #else 296 static inline void init_gbpages(void) 297 { 298 } 299 #endif 300 301 static void __init reserve_brk(void) 302 { 303 if (_brk_end > _brk_start) 304 reserve_early(__pa(_brk_start), __pa(_brk_end), "BRK"); 305 306 /* Mark brk area as locked down and no longer taking any 307 new allocations */ 308 _brk_start = 0; 309 } 310 311 #ifdef CONFIG_BLK_DEV_INITRD 312 313 #define MAX_MAP_CHUNK (NR_FIX_BTMAPS << PAGE_SHIFT) 314 static void __init relocate_initrd(void) 315 { 316 /* Assume only end is not page aligned */ 317 u64 ramdisk_image = boot_params.hdr.ramdisk_image; 318 u64 ramdisk_size = boot_params.hdr.ramdisk_size; 319 u64 area_size = PAGE_ALIGN(ramdisk_size); 320 u64 end_of_lowmem = max_low_pfn_mapped << PAGE_SHIFT; 321 u64 ramdisk_here; 322 unsigned long slop, clen, mapaddr; 323 char *p, *q; 324 325 /* We need to move the initrd down into lowmem */ 326 ramdisk_here = find_e820_area(0, end_of_lowmem, area_size, 327 PAGE_SIZE); 328 329 if (ramdisk_here == -1ULL) 330 panic("Cannot find place for new RAMDISK of size %lld\n", 331 ramdisk_size); 332 333 /* Note: this includes all the lowmem currently occupied by 334 the initrd, we rely on that fact to keep the data intact. */ 335 reserve_early(ramdisk_here, ramdisk_here + area_size, 336 "NEW RAMDISK"); 337 initrd_start = ramdisk_here + PAGE_OFFSET; 338 initrd_end = initrd_start + ramdisk_size; 339 printk(KERN_INFO "Allocated new RAMDISK: %08llx - %08llx\n", 340 ramdisk_here, ramdisk_here + ramdisk_size); 341 342 q = (char *)initrd_start; 343 344 /* Copy any lowmem portion of the initrd */ 345 if (ramdisk_image < end_of_lowmem) { 346 clen = end_of_lowmem - ramdisk_image; 347 p = (char *)__va(ramdisk_image); 348 memcpy(q, p, clen); 349 q += clen; 350 ramdisk_image += clen; 351 ramdisk_size -= clen; 352 } 353 354 /* Copy the highmem portion of the initrd */ 355 while (ramdisk_size) { 356 slop = ramdisk_image & ~PAGE_MASK; 357 clen = ramdisk_size; 358 if (clen > MAX_MAP_CHUNK-slop) 359 clen = MAX_MAP_CHUNK-slop; 360 mapaddr = ramdisk_image & PAGE_MASK; 361 p = early_memremap(mapaddr, clen+slop); 362 memcpy(q, p+slop, clen); 363 early_iounmap(p, clen+slop); 364 q += clen; 365 ramdisk_image += clen; 366 ramdisk_size -= clen; 367 } 368 /* high pages is not converted by early_res_to_bootmem */ 369 ramdisk_image = boot_params.hdr.ramdisk_image; 370 ramdisk_size = boot_params.hdr.ramdisk_size; 371 printk(KERN_INFO "Move RAMDISK from %016llx - %016llx to" 372 " %08llx - %08llx\n", 373 ramdisk_image, ramdisk_image + ramdisk_size - 1, 374 ramdisk_here, ramdisk_here + ramdisk_size - 1); 375 } 376 377 static void __init reserve_initrd(void) 378 { 379 /* Assume only end is not page aligned */ 380 u64 ramdisk_image = boot_params.hdr.ramdisk_image; 381 u64 ramdisk_size = boot_params.hdr.ramdisk_size; 382 u64 ramdisk_end = PAGE_ALIGN(ramdisk_image + ramdisk_size); 383 u64 end_of_lowmem = max_low_pfn_mapped << PAGE_SHIFT; 384 385 if (!boot_params.hdr.type_of_loader || 386 !ramdisk_image || !ramdisk_size) 387 return; /* No initrd provided by bootloader */ 388 389 initrd_start = 0; 390 391 if (ramdisk_size >= (end_of_lowmem>>1)) { 392 free_early(ramdisk_image, ramdisk_end); 393 printk(KERN_ERR "initrd too large to handle, " 394 "disabling initrd\n"); 395 return; 396 } 397 398 printk(KERN_INFO "RAMDISK: %08llx - %08llx\n", ramdisk_image, 399 ramdisk_end); 400 401 402 if (ramdisk_end <= end_of_lowmem) { 403 /* All in lowmem, easy case */ 404 /* 405 * don't need to reserve again, already reserved early 406 * in i386_start_kernel 407 */ 408 initrd_start = ramdisk_image + PAGE_OFFSET; 409 initrd_end = initrd_start + ramdisk_size; 410 return; 411 } 412 413 relocate_initrd(); 414 415 free_early(ramdisk_image, ramdisk_end); 416 } 417 #else 418 static void __init reserve_initrd(void) 419 { 420 } 421 #endif /* CONFIG_BLK_DEV_INITRD */ 422 423 static void __init parse_setup_data(void) 424 { 425 struct setup_data *data; 426 u64 pa_data; 427 428 if (boot_params.hdr.version < 0x0209) 429 return; 430 pa_data = boot_params.hdr.setup_data; 431 while (pa_data) { 432 data = early_memremap(pa_data, PAGE_SIZE); 433 switch (data->type) { 434 case SETUP_E820_EXT: 435 parse_e820_ext(data, pa_data); 436 break; 437 default: 438 break; 439 } 440 pa_data = data->next; 441 early_iounmap(data, PAGE_SIZE); 442 } 443 } 444 445 static void __init e820_reserve_setup_data(void) 446 { 447 struct setup_data *data; 448 u64 pa_data; 449 int found = 0; 450 451 if (boot_params.hdr.version < 0x0209) 452 return; 453 pa_data = boot_params.hdr.setup_data; 454 while (pa_data) { 455 data = early_memremap(pa_data, sizeof(*data)); 456 e820_update_range(pa_data, sizeof(*data)+data->len, 457 E820_RAM, E820_RESERVED_KERN); 458 found = 1; 459 pa_data = data->next; 460 early_iounmap(data, sizeof(*data)); 461 } 462 if (!found) 463 return; 464 465 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); 466 memcpy(&e820_saved, &e820, sizeof(struct e820map)); 467 printk(KERN_INFO "extended physical RAM map:\n"); 468 e820_print_map("reserve setup_data"); 469 } 470 471 static void __init reserve_early_setup_data(void) 472 { 473 struct setup_data *data; 474 u64 pa_data; 475 char buf[32]; 476 477 if (boot_params.hdr.version < 0x0209) 478 return; 479 pa_data = boot_params.hdr.setup_data; 480 while (pa_data) { 481 data = early_memremap(pa_data, sizeof(*data)); 482 sprintf(buf, "setup data %x", data->type); 483 reserve_early(pa_data, pa_data+sizeof(*data)+data->len, buf); 484 pa_data = data->next; 485 early_iounmap(data, sizeof(*data)); 486 } 487 } 488 489 /* 490 * --------- Crashkernel reservation ------------------------------ 491 */ 492 493 #ifdef CONFIG_KEXEC 494 495 static inline unsigned long long get_total_mem(void) 496 { 497 unsigned long long total; 498 499 total = max_pfn - min_low_pfn; 500 501 return total << PAGE_SHIFT; 502 } 503 504 static void __init reserve_crashkernel(void) 505 { 506 unsigned long long total_mem; 507 unsigned long long crash_size, crash_base; 508 int ret; 509 510 total_mem = get_total_mem(); 511 512 ret = parse_crashkernel(boot_command_line, total_mem, 513 &crash_size, &crash_base); 514 if (ret != 0 || crash_size <= 0) 515 return; 516 517 /* 0 means: find the address automatically */ 518 if (crash_base <= 0) { 519 const unsigned long long alignment = 16<<20; /* 16M */ 520 521 crash_base = find_e820_area(alignment, ULONG_MAX, crash_size, 522 alignment); 523 if (crash_base == -1ULL) { 524 pr_info("crashkernel reservation failed - No suitable area found.\n"); 525 return; 526 } 527 } else { 528 unsigned long long start; 529 530 start = find_e820_area(crash_base, ULONG_MAX, crash_size, 531 1<<20); 532 if (start != crash_base) { 533 pr_info("crashkernel reservation failed - memory is in use.\n"); 534 return; 535 } 536 } 537 reserve_early(crash_base, crash_base + crash_size, "CRASH KERNEL"); 538 539 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB " 540 "for crashkernel (System RAM: %ldMB)\n", 541 (unsigned long)(crash_size >> 20), 542 (unsigned long)(crash_base >> 20), 543 (unsigned long)(total_mem >> 20)); 544 545 crashk_res.start = crash_base; 546 crashk_res.end = crash_base + crash_size - 1; 547 insert_resource(&iomem_resource, &crashk_res); 548 } 549 #else 550 static void __init reserve_crashkernel(void) 551 { 552 } 553 #endif 554 555 static struct resource standard_io_resources[] = { 556 { .name = "dma1", .start = 0x00, .end = 0x1f, 557 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 558 { .name = "pic1", .start = 0x20, .end = 0x21, 559 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 560 { .name = "timer0", .start = 0x40, .end = 0x43, 561 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 562 { .name = "timer1", .start = 0x50, .end = 0x53, 563 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 564 { .name = "keyboard", .start = 0x60, .end = 0x60, 565 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 566 { .name = "keyboard", .start = 0x64, .end = 0x64, 567 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 568 { .name = "dma page reg", .start = 0x80, .end = 0x8f, 569 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 570 { .name = "pic2", .start = 0xa0, .end = 0xa1, 571 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 572 { .name = "dma2", .start = 0xc0, .end = 0xdf, 573 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 574 { .name = "fpu", .start = 0xf0, .end = 0xff, 575 .flags = IORESOURCE_BUSY | IORESOURCE_IO } 576 }; 577 578 void __init reserve_standard_io_resources(void) 579 { 580 int i; 581 582 /* request I/O space for devices used on all i[345]86 PCs */ 583 for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++) 584 request_resource(&ioport_resource, &standard_io_resources[i]); 585 586 } 587 588 /* 589 * Note: elfcorehdr_addr is not just limited to vmcore. It is also used by 590 * is_kdump_kernel() to determine if we are booting after a panic. Hence 591 * ifdef it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE. 592 */ 593 594 #ifdef CONFIG_CRASH_DUMP 595 /* elfcorehdr= specifies the location of elf core header 596 * stored by the crashed kernel. This option will be passed 597 * by kexec loader to the capture kernel. 598 */ 599 static int __init setup_elfcorehdr(char *arg) 600 { 601 char *end; 602 if (!arg) 603 return -EINVAL; 604 elfcorehdr_addr = memparse(arg, &end); 605 return end > arg ? 0 : -EINVAL; 606 } 607 early_param("elfcorehdr", setup_elfcorehdr); 608 #endif 609 610 static __init void reserve_ibft_region(void) 611 { 612 unsigned long addr, size = 0; 613 614 addr = find_ibft_region(&size); 615 616 if (size) 617 reserve_early_overlap_ok(addr, addr + size, "ibft"); 618 } 619 620 #ifdef CONFIG_X86_RESERVE_LOW_64K 621 static int __init dmi_low_memory_corruption(const struct dmi_system_id *d) 622 { 623 printk(KERN_NOTICE 624 "%s detected: BIOS may corrupt low RAM, working around it.\n", 625 d->ident); 626 627 e820_update_range(0, 0x10000, E820_RAM, E820_RESERVED); 628 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); 629 630 return 0; 631 } 632 #endif 633 634 /* List of systems that have known low memory corruption BIOS problems */ 635 static struct dmi_system_id __initdata bad_bios_dmi_table[] = { 636 #ifdef CONFIG_X86_RESERVE_LOW_64K 637 { 638 .callback = dmi_low_memory_corruption, 639 .ident = "AMI BIOS", 640 .matches = { 641 DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."), 642 }, 643 }, 644 { 645 .callback = dmi_low_memory_corruption, 646 .ident = "Phoenix BIOS", 647 .matches = { 648 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies"), 649 }, 650 }, 651 { 652 .callback = dmi_low_memory_corruption, 653 .ident = "Phoenix/MSC BIOS", 654 .matches = { 655 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix/MSC"), 656 }, 657 }, 658 /* 659 * AMI BIOS with low memory corruption was found on Intel DG45ID and 660 * DG45FC boards. 661 * It has a different DMI_BIOS_VENDOR = "Intel Corp.", for now we will 662 * match only DMI_BOARD_NAME and see if there is more bad products 663 * with this vendor. 664 */ 665 { 666 .callback = dmi_low_memory_corruption, 667 .ident = "AMI BIOS", 668 .matches = { 669 DMI_MATCH(DMI_BOARD_NAME, "DG45ID"), 670 }, 671 }, 672 { 673 .callback = dmi_low_memory_corruption, 674 .ident = "AMI BIOS", 675 .matches = { 676 DMI_MATCH(DMI_BOARD_NAME, "DG45FC"), 677 }, 678 }, 679 /* 680 * The Dell Inspiron Mini 1012 has DMI_BIOS_VENDOR = "Dell Inc.", so 681 * match on the product name. 682 */ 683 { 684 .callback = dmi_low_memory_corruption, 685 .ident = "Phoenix BIOS", 686 .matches = { 687 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1012"), 688 }, 689 }, 690 #endif 691 {} 692 }; 693 694 static void __init trim_bios_range(void) 695 { 696 /* 697 * A special case is the first 4Kb of memory; 698 * This is a BIOS owned area, not kernel ram, but generally 699 * not listed as such in the E820 table. 700 */ 701 e820_update_range(0, PAGE_SIZE, E820_RAM, E820_RESERVED); 702 /* 703 * special case: Some BIOSen report the PC BIOS 704 * area (640->1Mb) as ram even though it is not. 705 * take them out. 706 */ 707 e820_remove_range(BIOS_BEGIN, BIOS_END - BIOS_BEGIN, E820_RAM, 1); 708 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); 709 } 710 711 /* 712 * Determine if we were loaded by an EFI loader. If so, then we have also been 713 * passed the efi memmap, systab, etc., so we should use these data structures 714 * for initialization. Note, the efi init code path is determined by the 715 * global efi_enabled. This allows the same kernel image to be used on existing 716 * systems (with a traditional BIOS) as well as on EFI systems. 717 */ 718 /* 719 * setup_arch - architecture-specific boot-time initializations 720 * 721 * Note: On x86_64, fixmaps are ready for use even before this is called. 722 */ 723 724 void __init setup_arch(char **cmdline_p) 725 { 726 int acpi = 0; 727 int k8 = 0; 728 729 #ifdef CONFIG_X86_32 730 memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data)); 731 visws_early_detect(); 732 #else 733 printk(KERN_INFO "Command line: %s\n", boot_command_line); 734 #endif 735 736 /* VMI may relocate the fixmap; do this before touching ioremap area */ 737 vmi_init(); 738 739 early_trap_init(); 740 early_cpu_init(); 741 early_ioremap_init(); 742 743 ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev); 744 screen_info = boot_params.screen_info; 745 edid_info = boot_params.edid_info; 746 #ifdef CONFIG_X86_32 747 apm_info.bios = boot_params.apm_bios_info; 748 ist_info = boot_params.ist_info; 749 if (boot_params.sys_desc_table.length != 0) { 750 set_mca_bus(boot_params.sys_desc_table.table[3] & 0x2); 751 machine_id = boot_params.sys_desc_table.table[0]; 752 machine_submodel_id = boot_params.sys_desc_table.table[1]; 753 BIOS_revision = boot_params.sys_desc_table.table[2]; 754 } 755 #endif 756 saved_video_mode = boot_params.hdr.vid_mode; 757 bootloader_type = boot_params.hdr.type_of_loader; 758 if ((bootloader_type >> 4) == 0xe) { 759 bootloader_type &= 0xf; 760 bootloader_type |= (boot_params.hdr.ext_loader_type+0x10) << 4; 761 } 762 bootloader_version = bootloader_type & 0xf; 763 bootloader_version |= boot_params.hdr.ext_loader_ver << 4; 764 765 #ifdef CONFIG_BLK_DEV_RAM 766 rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK; 767 rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0); 768 rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0); 769 #endif 770 #ifdef CONFIG_EFI 771 if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature, 772 #ifdef CONFIG_X86_32 773 "EL32", 774 #else 775 "EL64", 776 #endif 777 4)) { 778 efi_enabled = 1; 779 efi_reserve_early(); 780 } 781 #endif 782 783 x86_init.oem.arch_setup(); 784 785 setup_memory_map(); 786 parse_setup_data(); 787 /* update the e820_saved too */ 788 e820_reserve_setup_data(); 789 790 copy_edd(); 791 792 if (!boot_params.hdr.root_flags) 793 root_mountflags &= ~MS_RDONLY; 794 init_mm.start_code = (unsigned long) _text; 795 init_mm.end_code = (unsigned long) _etext; 796 init_mm.end_data = (unsigned long) _edata; 797 init_mm.brk = _brk_end; 798 799 code_resource.start = virt_to_phys(_text); 800 code_resource.end = virt_to_phys(_etext)-1; 801 data_resource.start = virt_to_phys(_etext); 802 data_resource.end = virt_to_phys(_edata)-1; 803 bss_resource.start = virt_to_phys(&__bss_start); 804 bss_resource.end = virt_to_phys(&__bss_stop)-1; 805 806 #ifdef CONFIG_CMDLINE_BOOL 807 #ifdef CONFIG_CMDLINE_OVERRIDE 808 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE); 809 #else 810 if (builtin_cmdline[0]) { 811 /* append boot loader cmdline to builtin */ 812 strlcat(builtin_cmdline, " ", COMMAND_LINE_SIZE); 813 strlcat(builtin_cmdline, boot_command_line, COMMAND_LINE_SIZE); 814 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE); 815 } 816 #endif 817 #endif 818 819 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE); 820 *cmdline_p = command_line; 821 822 /* 823 * x86_configure_nx() is called before parse_early_param() to detect 824 * whether hardware doesn't support NX (so that the early EHCI debug 825 * console setup can safely call set_fixmap()). It may then be called 826 * again from within noexec_setup() during parsing early parameters 827 * to honor the respective command line option. 828 */ 829 x86_configure_nx(); 830 831 parse_early_param(); 832 833 x86_report_nx(); 834 835 /* Must be before kernel pagetables are setup */ 836 vmi_activate(); 837 838 /* after early param, so could get panic from serial */ 839 reserve_early_setup_data(); 840 841 if (acpi_mps_check()) { 842 #ifdef CONFIG_X86_LOCAL_APIC 843 disable_apic = 1; 844 #endif 845 setup_clear_cpu_cap(X86_FEATURE_APIC); 846 } 847 848 #ifdef CONFIG_PCI 849 if (pci_early_dump_regs) 850 early_dump_pci_devices(); 851 #endif 852 853 finish_e820_parsing(); 854 855 if (efi_enabled) 856 efi_init(); 857 858 dmi_scan_machine(); 859 860 dmi_check_system(bad_bios_dmi_table); 861 862 /* 863 * VMware detection requires dmi to be available, so this 864 * needs to be done after dmi_scan_machine, for the BP. 865 */ 866 init_hypervisor_platform(); 867 868 x86_init.resources.probe_roms(); 869 870 /* after parse_early_param, so could debug it */ 871 insert_resource(&iomem_resource, &code_resource); 872 insert_resource(&iomem_resource, &data_resource); 873 insert_resource(&iomem_resource, &bss_resource); 874 875 trim_bios_range(); 876 #ifdef CONFIG_X86_32 877 if (ppro_with_ram_bug()) { 878 e820_update_range(0x70000000ULL, 0x40000ULL, E820_RAM, 879 E820_RESERVED); 880 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); 881 printk(KERN_INFO "fixed physical RAM map:\n"); 882 e820_print_map("bad_ppro"); 883 } 884 #else 885 early_gart_iommu_check(); 886 #endif 887 888 /* 889 * partially used pages are not usable - thus 890 * we are rounding upwards: 891 */ 892 max_pfn = e820_end_of_ram_pfn(); 893 894 /* preallocate 4k for mptable mpc */ 895 early_reserve_e820_mpc_new(); 896 /* update e820 for memory not covered by WB MTRRs */ 897 mtrr_bp_init(); 898 if (mtrr_trim_uncached_memory(max_pfn)) 899 max_pfn = e820_end_of_ram_pfn(); 900 901 #ifdef CONFIG_X86_32 902 /* max_low_pfn get updated here */ 903 find_low_pfn_range(); 904 #else 905 num_physpages = max_pfn; 906 907 check_x2apic(); 908 909 /* How many end-of-memory variables you have, grandma! */ 910 /* need this before calling reserve_initrd */ 911 if (max_pfn > (1UL<<(32 - PAGE_SHIFT))) 912 max_low_pfn = e820_end_of_low_ram_pfn(); 913 else 914 max_low_pfn = max_pfn; 915 916 high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1; 917 max_pfn_mapped = KERNEL_IMAGE_SIZE >> PAGE_SHIFT; 918 #endif 919 920 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION 921 setup_bios_corruption_check(); 922 #endif 923 924 printk(KERN_DEBUG "initial memory mapped : 0 - %08lx\n", 925 max_pfn_mapped<<PAGE_SHIFT); 926 927 reserve_brk(); 928 929 /* 930 * Find and reserve possible boot-time SMP configuration: 931 */ 932 find_smp_config(); 933 934 reserve_ibft_region(); 935 936 reserve_trampoline_memory(); 937 938 #ifdef CONFIG_ACPI_SLEEP 939 /* 940 * Reserve low memory region for sleep support. 941 * even before init_memory_mapping 942 */ 943 acpi_reserve_wakeup_memory(); 944 #endif 945 init_gbpages(); 946 947 /* max_pfn_mapped is updated here */ 948 max_low_pfn_mapped = init_memory_mapping(0, max_low_pfn<<PAGE_SHIFT); 949 max_pfn_mapped = max_low_pfn_mapped; 950 951 #ifdef CONFIG_X86_64 952 if (max_pfn > max_low_pfn) { 953 max_pfn_mapped = init_memory_mapping(1UL<<32, 954 max_pfn<<PAGE_SHIFT); 955 /* can we preseve max_low_pfn ?*/ 956 max_low_pfn = max_pfn; 957 } 958 #endif 959 960 /* 961 * NOTE: On x86-32, only from this point on, fixmaps are ready for use. 962 */ 963 964 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT 965 if (init_ohci1394_dma_early) 966 init_ohci1394_dma_on_all_controllers(); 967 #endif 968 969 reserve_initrd(); 970 971 reserve_crashkernel(); 972 973 vsmp_init(); 974 975 io_delay_init(); 976 977 /* 978 * Parse the ACPI tables for possible boot-time SMP configuration. 979 */ 980 acpi_boot_table_init(); 981 982 early_acpi_boot_init(); 983 984 #ifdef CONFIG_ACPI_NUMA 985 /* 986 * Parse SRAT to discover nodes. 987 */ 988 acpi = acpi_numa_init(); 989 #endif 990 991 #ifdef CONFIG_K8_NUMA 992 if (!acpi) 993 k8 = !k8_numa_init(0, max_pfn); 994 #endif 995 996 initmem_init(0, max_pfn, acpi, k8); 997 #ifndef CONFIG_NO_BOOTMEM 998 early_res_to_bootmem(0, max_low_pfn<<PAGE_SHIFT); 999 #endif 1000 1001 dma32_reserve_bootmem(); 1002 1003 #ifdef CONFIG_KVM_CLOCK 1004 kvmclock_init(); 1005 #endif 1006 1007 x86_init.paging.pagetable_setup_start(swapper_pg_dir); 1008 paging_init(); 1009 x86_init.paging.pagetable_setup_done(swapper_pg_dir); 1010 1011 tboot_probe(); 1012 1013 #ifdef CONFIG_X86_64 1014 map_vsyscall(); 1015 #endif 1016 1017 generic_apic_probe(); 1018 1019 early_quirks(); 1020 1021 /* 1022 * Read APIC and some other early information from ACPI tables. 1023 */ 1024 acpi_boot_init(); 1025 1026 sfi_init(); 1027 1028 /* 1029 * get boot-time SMP configuration: 1030 */ 1031 if (smp_found_config) 1032 get_smp_config(); 1033 1034 prefill_possible_map(); 1035 1036 #ifdef CONFIG_X86_64 1037 init_cpu_to_node(); 1038 #endif 1039 1040 init_apic_mappings(); 1041 ioapic_init_mappings(); 1042 1043 /* need to wait for io_apic is mapped */ 1044 probe_nr_irqs_gsi(); 1045 1046 kvm_guest_init(); 1047 1048 e820_reserve_resources(); 1049 e820_mark_nosave_regions(max_low_pfn); 1050 1051 x86_init.resources.reserve_resources(); 1052 1053 e820_setup_gap(); 1054 1055 #ifdef CONFIG_VT 1056 #if defined(CONFIG_VGA_CONSOLE) 1057 if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY)) 1058 conswitchp = &vga_con; 1059 #elif defined(CONFIG_DUMMY_CONSOLE) 1060 conswitchp = &dummy_con; 1061 #endif 1062 #endif 1063 x86_init.oem.banner(); 1064 1065 mcheck_init(); 1066 } 1067 1068 #ifdef CONFIG_X86_32 1069 1070 static struct resource video_ram_resource = { 1071 .name = "Video RAM area", 1072 .start = 0xa0000, 1073 .end = 0xbffff, 1074 .flags = IORESOURCE_BUSY | IORESOURCE_MEM 1075 }; 1076 1077 void __init i386_reserve_resources(void) 1078 { 1079 request_resource(&iomem_resource, &video_ram_resource); 1080 reserve_standard_io_resources(); 1081 } 1082 1083 #endif /* CONFIG_X86_32 */ 1084