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 #include <asm/olpc_ofw.h> 106 107 #include <asm/percpu.h> 108 #include <asm/topology.h> 109 #include <asm/apicdef.h> 110 #include <asm/k8.h> 111 #ifdef CONFIG_X86_64 112 #include <asm/numa_64.h> 113 #endif 114 #include <asm/mce.h> 115 116 /* 117 * end_pfn only includes RAM, while max_pfn_mapped includes all e820 entries. 118 * The direct mapping extends to max_pfn_mapped, so that we can directly access 119 * apertures, ACPI and other tables without having to play with fixmaps. 120 */ 121 unsigned long max_low_pfn_mapped; 122 unsigned long max_pfn_mapped; 123 124 #ifdef CONFIG_DMI 125 RESERVE_BRK(dmi_alloc, 65536); 126 #endif 127 128 unsigned int boot_cpu_id __read_mostly; 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 static void set_mca_bus(int x) 183 { 184 #ifdef CONFIG_MCA 185 MCA_bus = x; 186 #endif 187 } 188 189 unsigned int def_to_bigsmp; 190 191 /* for MCA, but anyone else can use it if they want */ 192 unsigned int machine_id; 193 unsigned int machine_submodel_id; 194 unsigned int BIOS_revision; 195 196 struct apm_info apm_info; 197 EXPORT_SYMBOL(apm_info); 198 199 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \ 200 defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE) 201 struct ist_info ist_info; 202 EXPORT_SYMBOL(ist_info); 203 #else 204 struct ist_info ist_info; 205 #endif 206 207 #else 208 struct cpuinfo_x86 boot_cpu_data __read_mostly = { 209 .x86_phys_bits = MAX_PHYSMEM_BITS, 210 }; 211 EXPORT_SYMBOL(boot_cpu_data); 212 #endif 213 214 215 #if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64) 216 unsigned long mmu_cr4_features; 217 #else 218 unsigned long mmu_cr4_features = X86_CR4_PAE; 219 #endif 220 221 /* Boot loader ID and version as integers, for the benefit of proc_dointvec */ 222 int bootloader_type, bootloader_version; 223 224 /* 225 * Setup options 226 */ 227 struct screen_info screen_info; 228 EXPORT_SYMBOL(screen_info); 229 struct edid_info edid_info; 230 EXPORT_SYMBOL_GPL(edid_info); 231 232 extern int root_mountflags; 233 234 unsigned long saved_video_mode; 235 236 #define RAMDISK_IMAGE_START_MASK 0x07FF 237 #define RAMDISK_PROMPT_FLAG 0x8000 238 #define RAMDISK_LOAD_FLAG 0x4000 239 240 static char __initdata command_line[COMMAND_LINE_SIZE]; 241 #ifdef CONFIG_CMDLINE_BOOL 242 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE; 243 #endif 244 245 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE) 246 struct edd edd; 247 #ifdef CONFIG_EDD_MODULE 248 EXPORT_SYMBOL(edd); 249 #endif 250 /** 251 * copy_edd() - Copy the BIOS EDD information 252 * from boot_params into a safe place. 253 * 254 */ 255 static inline void __init copy_edd(void) 256 { 257 memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer, 258 sizeof(edd.mbr_signature)); 259 memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info)); 260 edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries; 261 edd.edd_info_nr = boot_params.eddbuf_entries; 262 } 263 #else 264 static inline void __init copy_edd(void) 265 { 266 } 267 #endif 268 269 void * __init extend_brk(size_t size, size_t align) 270 { 271 size_t mask = align - 1; 272 void *ret; 273 274 BUG_ON(_brk_start == 0); 275 BUG_ON(align & mask); 276 277 _brk_end = (_brk_end + mask) & ~mask; 278 BUG_ON((char *)(_brk_end + size) > __brk_limit); 279 280 ret = (void *)_brk_end; 281 _brk_end += size; 282 283 memset(ret, 0, size); 284 285 return ret; 286 } 287 288 #ifdef CONFIG_X86_64 289 static void __init init_gbpages(void) 290 { 291 if (direct_gbpages && cpu_has_gbpages) 292 printk(KERN_INFO "Using GB pages for direct mapping\n"); 293 else 294 direct_gbpages = 0; 295 } 296 #else 297 static inline void init_gbpages(void) 298 { 299 } 300 #endif 301 302 static void __init reserve_brk(void) 303 { 304 if (_brk_end > _brk_start) 305 reserve_early(__pa(_brk_start), __pa(_brk_end), "BRK"); 306 307 /* Mark brk area as locked down and no longer taking any 308 new allocations */ 309 _brk_start = 0; 310 } 311 312 #ifdef CONFIG_BLK_DEV_INITRD 313 314 #define MAX_MAP_CHUNK (NR_FIX_BTMAPS << PAGE_SHIFT) 315 static void __init relocate_initrd(void) 316 { 317 /* Assume only end is not page aligned */ 318 u64 ramdisk_image = boot_params.hdr.ramdisk_image; 319 u64 ramdisk_size = boot_params.hdr.ramdisk_size; 320 u64 area_size = PAGE_ALIGN(ramdisk_size); 321 u64 end_of_lowmem = max_low_pfn_mapped << PAGE_SHIFT; 322 u64 ramdisk_here; 323 unsigned long slop, clen, mapaddr; 324 char *p, *q; 325 326 /* We need to move the initrd down into lowmem */ 327 ramdisk_here = find_e820_area(0, end_of_lowmem, area_size, 328 PAGE_SIZE); 329 330 if (ramdisk_here == -1ULL) 331 panic("Cannot find place for new RAMDISK of size %lld\n", 332 ramdisk_size); 333 334 /* Note: this includes all the lowmem currently occupied by 335 the initrd, we rely on that fact to keep the data intact. */ 336 reserve_early(ramdisk_here, ramdisk_here + area_size, 337 "NEW RAMDISK"); 338 initrd_start = ramdisk_here + PAGE_OFFSET; 339 initrd_end = initrd_start + ramdisk_size; 340 printk(KERN_INFO "Allocated new RAMDISK: %08llx - %08llx\n", 341 ramdisk_here, ramdisk_here + ramdisk_size); 342 343 q = (char *)initrd_start; 344 345 /* Copy any lowmem portion of the initrd */ 346 if (ramdisk_image < end_of_lowmem) { 347 clen = end_of_lowmem - ramdisk_image; 348 p = (char *)__va(ramdisk_image); 349 memcpy(q, p, clen); 350 q += clen; 351 ramdisk_image += clen; 352 ramdisk_size -= clen; 353 } 354 355 /* Copy the highmem portion of the initrd */ 356 while (ramdisk_size) { 357 slop = ramdisk_image & ~PAGE_MASK; 358 clen = ramdisk_size; 359 if (clen > MAX_MAP_CHUNK-slop) 360 clen = MAX_MAP_CHUNK-slop; 361 mapaddr = ramdisk_image & PAGE_MASK; 362 p = early_memremap(mapaddr, clen+slop); 363 memcpy(q, p+slop, clen); 364 early_iounmap(p, clen+slop); 365 q += clen; 366 ramdisk_image += clen; 367 ramdisk_size -= clen; 368 } 369 /* high pages is not converted by early_res_to_bootmem */ 370 ramdisk_image = boot_params.hdr.ramdisk_image; 371 ramdisk_size = boot_params.hdr.ramdisk_size; 372 printk(KERN_INFO "Move RAMDISK from %016llx - %016llx to" 373 " %08llx - %08llx\n", 374 ramdisk_image, ramdisk_image + ramdisk_size - 1, 375 ramdisk_here, ramdisk_here + ramdisk_size - 1); 376 } 377 378 static void __init reserve_initrd(void) 379 { 380 /* Assume only end is not page aligned */ 381 u64 ramdisk_image = boot_params.hdr.ramdisk_image; 382 u64 ramdisk_size = boot_params.hdr.ramdisk_size; 383 u64 ramdisk_end = PAGE_ALIGN(ramdisk_image + ramdisk_size); 384 u64 end_of_lowmem = max_low_pfn_mapped << PAGE_SHIFT; 385 386 if (!boot_params.hdr.type_of_loader || 387 !ramdisk_image || !ramdisk_size) 388 return; /* No initrd provided by bootloader */ 389 390 initrd_start = 0; 391 392 if (ramdisk_size >= (end_of_lowmem>>1)) { 393 free_early(ramdisk_image, ramdisk_end); 394 printk(KERN_ERR "initrd too large to handle, " 395 "disabling initrd\n"); 396 return; 397 } 398 399 printk(KERN_INFO "RAMDISK: %08llx - %08llx\n", ramdisk_image, 400 ramdisk_end); 401 402 403 if (ramdisk_end <= end_of_lowmem) { 404 /* All in lowmem, easy case */ 405 /* 406 * don't need to reserve again, already reserved early 407 * in i386_start_kernel 408 */ 409 initrd_start = ramdisk_image + PAGE_OFFSET; 410 initrd_end = initrd_start + ramdisk_size; 411 return; 412 } 413 414 relocate_initrd(); 415 416 free_early(ramdisk_image, ramdisk_end); 417 } 418 #else 419 static void __init reserve_initrd(void) 420 { 421 } 422 #endif /* CONFIG_BLK_DEV_INITRD */ 423 424 static void __init parse_setup_data(void) 425 { 426 struct setup_data *data; 427 u64 pa_data; 428 429 if (boot_params.hdr.version < 0x0209) 430 return; 431 pa_data = boot_params.hdr.setup_data; 432 while (pa_data) { 433 data = early_memremap(pa_data, PAGE_SIZE); 434 switch (data->type) { 435 case SETUP_E820_EXT: 436 parse_e820_ext(data, pa_data); 437 break; 438 default: 439 break; 440 } 441 pa_data = data->next; 442 early_iounmap(data, PAGE_SIZE); 443 } 444 } 445 446 static void __init e820_reserve_setup_data(void) 447 { 448 struct setup_data *data; 449 u64 pa_data; 450 int found = 0; 451 452 if (boot_params.hdr.version < 0x0209) 453 return; 454 pa_data = boot_params.hdr.setup_data; 455 while (pa_data) { 456 data = early_memremap(pa_data, sizeof(*data)); 457 e820_update_range(pa_data, sizeof(*data)+data->len, 458 E820_RAM, E820_RESERVED_KERN); 459 found = 1; 460 pa_data = data->next; 461 early_iounmap(data, sizeof(*data)); 462 } 463 if (!found) 464 return; 465 466 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); 467 memcpy(&e820_saved, &e820, sizeof(struct e820map)); 468 printk(KERN_INFO "extended physical RAM map:\n"); 469 e820_print_map("reserve setup_data"); 470 } 471 472 static void __init reserve_early_setup_data(void) 473 { 474 struct setup_data *data; 475 u64 pa_data; 476 char buf[32]; 477 478 if (boot_params.hdr.version < 0x0209) 479 return; 480 pa_data = boot_params.hdr.setup_data; 481 while (pa_data) { 482 data = early_memremap(pa_data, sizeof(*data)); 483 sprintf(buf, "setup data %x", data->type); 484 reserve_early(pa_data, pa_data+sizeof(*data)+data->len, buf); 485 pa_data = data->next; 486 early_iounmap(data, sizeof(*data)); 487 } 488 } 489 490 /* 491 * --------- Crashkernel reservation ------------------------------ 492 */ 493 494 #ifdef CONFIG_KEXEC 495 496 static inline unsigned long long get_total_mem(void) 497 { 498 unsigned long long total; 499 500 total = max_pfn - min_low_pfn; 501 502 return total << PAGE_SHIFT; 503 } 504 505 static void __init reserve_crashkernel(void) 506 { 507 unsigned long long total_mem; 508 unsigned long long crash_size, crash_base; 509 int ret; 510 511 total_mem = get_total_mem(); 512 513 ret = parse_crashkernel(boot_command_line, total_mem, 514 &crash_size, &crash_base); 515 if (ret != 0 || crash_size <= 0) 516 return; 517 518 /* 0 means: find the address automatically */ 519 if (crash_base <= 0) { 520 const unsigned long long alignment = 16<<20; /* 16M */ 521 522 crash_base = find_e820_area(alignment, ULONG_MAX, crash_size, 523 alignment); 524 if (crash_base == -1ULL) { 525 pr_info("crashkernel reservation failed - No suitable area found.\n"); 526 return; 527 } 528 } else { 529 unsigned long long start; 530 531 start = find_e820_area(crash_base, ULONG_MAX, crash_size, 532 1<<20); 533 if (start != crash_base) { 534 pr_info("crashkernel reservation failed - memory is in use.\n"); 535 return; 536 } 537 } 538 reserve_early(crash_base, crash_base + crash_size, "CRASH KERNEL"); 539 540 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB " 541 "for crashkernel (System RAM: %ldMB)\n", 542 (unsigned long)(crash_size >> 20), 543 (unsigned long)(crash_base >> 20), 544 (unsigned long)(total_mem >> 20)); 545 546 crashk_res.start = crash_base; 547 crashk_res.end = crash_base + crash_size - 1; 548 insert_resource(&iomem_resource, &crashk_res); 549 } 550 #else 551 static void __init reserve_crashkernel(void) 552 { 553 } 554 #endif 555 556 static struct resource standard_io_resources[] = { 557 { .name = "dma1", .start = 0x00, .end = 0x1f, 558 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 559 { .name = "pic1", .start = 0x20, .end = 0x21, 560 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 561 { .name = "timer0", .start = 0x40, .end = 0x43, 562 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 563 { .name = "timer1", .start = 0x50, .end = 0x53, 564 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 565 { .name = "keyboard", .start = 0x60, .end = 0x60, 566 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 567 { .name = "keyboard", .start = 0x64, .end = 0x64, 568 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 569 { .name = "dma page reg", .start = 0x80, .end = 0x8f, 570 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 571 { .name = "pic2", .start = 0xa0, .end = 0xa1, 572 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 573 { .name = "dma2", .start = 0xc0, .end = 0xdf, 574 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 575 { .name = "fpu", .start = 0xf0, .end = 0xff, 576 .flags = IORESOURCE_BUSY | IORESOURCE_IO } 577 }; 578 579 void __init reserve_standard_io_resources(void) 580 { 581 int i; 582 583 /* request I/O space for devices used on all i[345]86 PCs */ 584 for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++) 585 request_resource(&ioport_resource, &standard_io_resources[i]); 586 587 } 588 589 /* 590 * Note: elfcorehdr_addr is not just limited to vmcore. It is also used by 591 * is_kdump_kernel() to determine if we are booting after a panic. Hence 592 * ifdef it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE. 593 */ 594 595 #ifdef CONFIG_CRASH_DUMP 596 /* elfcorehdr= specifies the location of elf core header 597 * stored by the crashed kernel. This option will be passed 598 * by kexec loader to the capture kernel. 599 */ 600 static int __init setup_elfcorehdr(char *arg) 601 { 602 char *end; 603 if (!arg) 604 return -EINVAL; 605 elfcorehdr_addr = memparse(arg, &end); 606 return end > arg ? 0 : -EINVAL; 607 } 608 early_param("elfcorehdr", setup_elfcorehdr); 609 #endif 610 611 static __init void reserve_ibft_region(void) 612 { 613 unsigned long addr, size = 0; 614 615 addr = find_ibft_region(&size); 616 617 if (size) 618 reserve_early_overlap_ok(addr, addr + size, "ibft"); 619 } 620 621 #ifdef CONFIG_X86_RESERVE_LOW_64K 622 static int __init dmi_low_memory_corruption(const struct dmi_system_id *d) 623 { 624 printk(KERN_NOTICE 625 "%s detected: BIOS may corrupt low RAM, working around it.\n", 626 d->ident); 627 628 e820_update_range(0, 0x10000, E820_RAM, E820_RESERVED); 629 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); 630 631 return 0; 632 } 633 #endif 634 635 /* List of systems that have known low memory corruption BIOS problems */ 636 static struct dmi_system_id __initdata bad_bios_dmi_table[] = { 637 #ifdef CONFIG_X86_RESERVE_LOW_64K 638 { 639 .callback = dmi_low_memory_corruption, 640 .ident = "AMI BIOS", 641 .matches = { 642 DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."), 643 }, 644 }, 645 { 646 .callback = dmi_low_memory_corruption, 647 .ident = "Phoenix BIOS", 648 .matches = { 649 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies"), 650 }, 651 }, 652 { 653 .callback = dmi_low_memory_corruption, 654 .ident = "Phoenix/MSC BIOS", 655 .matches = { 656 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix/MSC"), 657 }, 658 }, 659 /* 660 * AMI BIOS with low memory corruption was found on Intel DG45ID and 661 * DG45FC boards. 662 * It has a different DMI_BIOS_VENDOR = "Intel Corp.", for now we will 663 * match only DMI_BOARD_NAME and see if there is more bad products 664 * with this vendor. 665 */ 666 { 667 .callback = dmi_low_memory_corruption, 668 .ident = "AMI BIOS", 669 .matches = { 670 DMI_MATCH(DMI_BOARD_NAME, "DG45ID"), 671 }, 672 }, 673 { 674 .callback = dmi_low_memory_corruption, 675 .ident = "AMI BIOS", 676 .matches = { 677 DMI_MATCH(DMI_BOARD_NAME, "DG45FC"), 678 }, 679 }, 680 /* 681 * The Dell Inspiron Mini 1012 has DMI_BIOS_VENDOR = "Dell Inc.", so 682 * match on the product name. 683 */ 684 { 685 .callback = dmi_low_memory_corruption, 686 .ident = "Phoenix BIOS", 687 .matches = { 688 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1012"), 689 }, 690 }, 691 #endif 692 {} 693 }; 694 695 static void __init trim_bios_range(void) 696 { 697 /* 698 * A special case is the first 4Kb of memory; 699 * This is a BIOS owned area, not kernel ram, but generally 700 * not listed as such in the E820 table. 701 */ 702 e820_update_range(0, PAGE_SIZE, E820_RAM, E820_RESERVED); 703 /* 704 * special case: Some BIOSen report the PC BIOS 705 * area (640->1Mb) as ram even though it is not. 706 * take them out. 707 */ 708 e820_remove_range(BIOS_BEGIN, BIOS_END - BIOS_BEGIN, E820_RAM, 1); 709 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); 710 } 711 712 /* 713 * Determine if we were loaded by an EFI loader. If so, then we have also been 714 * passed the efi memmap, systab, etc., so we should use these data structures 715 * for initialization. Note, the efi init code path is determined by the 716 * global efi_enabled. This allows the same kernel image to be used on existing 717 * systems (with a traditional BIOS) as well as on EFI systems. 718 */ 719 /* 720 * setup_arch - architecture-specific boot-time initializations 721 * 722 * Note: On x86_64, fixmaps are ready for use even before this is called. 723 */ 724 725 void __init setup_arch(char **cmdline_p) 726 { 727 int acpi = 0; 728 int k8 = 0; 729 730 #ifdef CONFIG_X86_32 731 memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data)); 732 visws_early_detect(); 733 #else 734 printk(KERN_INFO "Command line: %s\n", boot_command_line); 735 #endif 736 737 /* VMI may relocate the fixmap; do this before touching ioremap area */ 738 vmi_init(); 739 740 /* OFW also may relocate the fixmap */ 741 olpc_ofw_detect(); 742 743 early_trap_init(); 744 early_cpu_init(); 745 early_ioremap_init(); 746 747 setup_olpc_ofw_pgd(); 748 749 ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev); 750 screen_info = boot_params.screen_info; 751 edid_info = boot_params.edid_info; 752 #ifdef CONFIG_X86_32 753 apm_info.bios = boot_params.apm_bios_info; 754 ist_info = boot_params.ist_info; 755 if (boot_params.sys_desc_table.length != 0) { 756 set_mca_bus(boot_params.sys_desc_table.table[3] & 0x2); 757 machine_id = boot_params.sys_desc_table.table[0]; 758 machine_submodel_id = boot_params.sys_desc_table.table[1]; 759 BIOS_revision = boot_params.sys_desc_table.table[2]; 760 } 761 #endif 762 saved_video_mode = boot_params.hdr.vid_mode; 763 bootloader_type = boot_params.hdr.type_of_loader; 764 if ((bootloader_type >> 4) == 0xe) { 765 bootloader_type &= 0xf; 766 bootloader_type |= (boot_params.hdr.ext_loader_type+0x10) << 4; 767 } 768 bootloader_version = bootloader_type & 0xf; 769 bootloader_version |= boot_params.hdr.ext_loader_ver << 4; 770 771 #ifdef CONFIG_BLK_DEV_RAM 772 rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK; 773 rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0); 774 rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0); 775 #endif 776 #ifdef CONFIG_EFI 777 if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature, 778 #ifdef CONFIG_X86_32 779 "EL32", 780 #else 781 "EL64", 782 #endif 783 4)) { 784 efi_enabled = 1; 785 efi_reserve_early(); 786 } 787 #endif 788 789 x86_init.oem.arch_setup(); 790 791 setup_memory_map(); 792 parse_setup_data(); 793 /* update the e820_saved too */ 794 e820_reserve_setup_data(); 795 796 copy_edd(); 797 798 if (!boot_params.hdr.root_flags) 799 root_mountflags &= ~MS_RDONLY; 800 init_mm.start_code = (unsigned long) _text; 801 init_mm.end_code = (unsigned long) _etext; 802 init_mm.end_data = (unsigned long) _edata; 803 init_mm.brk = _brk_end; 804 805 code_resource.start = virt_to_phys(_text); 806 code_resource.end = virt_to_phys(_etext)-1; 807 data_resource.start = virt_to_phys(_etext); 808 data_resource.end = virt_to_phys(_edata)-1; 809 bss_resource.start = virt_to_phys(&__bss_start); 810 bss_resource.end = virt_to_phys(&__bss_stop)-1; 811 812 #ifdef CONFIG_CMDLINE_BOOL 813 #ifdef CONFIG_CMDLINE_OVERRIDE 814 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE); 815 #else 816 if (builtin_cmdline[0]) { 817 /* append boot loader cmdline to builtin */ 818 strlcat(builtin_cmdline, " ", COMMAND_LINE_SIZE); 819 strlcat(builtin_cmdline, boot_command_line, COMMAND_LINE_SIZE); 820 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE); 821 } 822 #endif 823 #endif 824 825 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE); 826 *cmdline_p = command_line; 827 828 /* 829 * x86_configure_nx() is called before parse_early_param() to detect 830 * whether hardware doesn't support NX (so that the early EHCI debug 831 * console setup can safely call set_fixmap()). It may then be called 832 * again from within noexec_setup() during parsing early parameters 833 * to honor the respective command line option. 834 */ 835 x86_configure_nx(); 836 837 parse_early_param(); 838 839 x86_report_nx(); 840 841 /* Must be before kernel pagetables are setup */ 842 vmi_activate(); 843 844 /* after early param, so could get panic from serial */ 845 reserve_early_setup_data(); 846 847 if (acpi_mps_check()) { 848 #ifdef CONFIG_X86_LOCAL_APIC 849 disable_apic = 1; 850 #endif 851 setup_clear_cpu_cap(X86_FEATURE_APIC); 852 } 853 854 #ifdef CONFIG_PCI 855 if (pci_early_dump_regs) 856 early_dump_pci_devices(); 857 #endif 858 859 finish_e820_parsing(); 860 861 if (efi_enabled) 862 efi_init(); 863 864 dmi_scan_machine(); 865 866 dmi_check_system(bad_bios_dmi_table); 867 868 /* 869 * VMware detection requires dmi to be available, so this 870 * needs to be done after dmi_scan_machine, for the BP. 871 */ 872 init_hypervisor_platform(); 873 874 x86_init.resources.probe_roms(); 875 876 /* after parse_early_param, so could debug it */ 877 insert_resource(&iomem_resource, &code_resource); 878 insert_resource(&iomem_resource, &data_resource); 879 insert_resource(&iomem_resource, &bss_resource); 880 881 trim_bios_range(); 882 #ifdef CONFIG_X86_32 883 if (ppro_with_ram_bug()) { 884 e820_update_range(0x70000000ULL, 0x40000ULL, E820_RAM, 885 E820_RESERVED); 886 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); 887 printk(KERN_INFO "fixed physical RAM map:\n"); 888 e820_print_map("bad_ppro"); 889 } 890 #else 891 early_gart_iommu_check(); 892 #endif 893 894 /* 895 * partially used pages are not usable - thus 896 * we are rounding upwards: 897 */ 898 max_pfn = e820_end_of_ram_pfn(); 899 900 /* preallocate 4k for mptable mpc */ 901 early_reserve_e820_mpc_new(); 902 /* update e820 for memory not covered by WB MTRRs */ 903 mtrr_bp_init(); 904 if (mtrr_trim_uncached_memory(max_pfn)) 905 max_pfn = e820_end_of_ram_pfn(); 906 907 #ifdef CONFIG_X86_32 908 /* max_low_pfn get updated here */ 909 find_low_pfn_range(); 910 #else 911 num_physpages = max_pfn; 912 913 check_x2apic(); 914 915 /* How many end-of-memory variables you have, grandma! */ 916 /* need this before calling reserve_initrd */ 917 if (max_pfn > (1UL<<(32 - PAGE_SHIFT))) 918 max_low_pfn = e820_end_of_low_ram_pfn(); 919 else 920 max_low_pfn = max_pfn; 921 922 high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1; 923 max_pfn_mapped = KERNEL_IMAGE_SIZE >> PAGE_SHIFT; 924 #endif 925 926 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION 927 setup_bios_corruption_check(); 928 #endif 929 930 printk(KERN_DEBUG "initial memory mapped : 0 - %08lx\n", 931 max_pfn_mapped<<PAGE_SHIFT); 932 933 reserve_brk(); 934 935 /* 936 * Find and reserve possible boot-time SMP configuration: 937 */ 938 find_smp_config(); 939 940 reserve_ibft_region(); 941 942 reserve_trampoline_memory(); 943 944 #ifdef CONFIG_ACPI_SLEEP 945 /* 946 * Reserve low memory region for sleep support. 947 * even before init_memory_mapping 948 */ 949 acpi_reserve_wakeup_memory(); 950 #endif 951 init_gbpages(); 952 953 /* max_pfn_mapped is updated here */ 954 max_low_pfn_mapped = init_memory_mapping(0, max_low_pfn<<PAGE_SHIFT); 955 max_pfn_mapped = max_low_pfn_mapped; 956 957 #ifdef CONFIG_X86_64 958 if (max_pfn > max_low_pfn) { 959 max_pfn_mapped = init_memory_mapping(1UL<<32, 960 max_pfn<<PAGE_SHIFT); 961 /* can we preseve max_low_pfn ?*/ 962 max_low_pfn = max_pfn; 963 } 964 #endif 965 966 /* 967 * NOTE: On x86-32, only from this point on, fixmaps are ready for use. 968 */ 969 970 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT 971 if (init_ohci1394_dma_early) 972 init_ohci1394_dma_on_all_controllers(); 973 #endif 974 975 reserve_initrd(); 976 977 reserve_crashkernel(); 978 979 vsmp_init(); 980 981 io_delay_init(); 982 983 /* 984 * Parse the ACPI tables for possible boot-time SMP configuration. 985 */ 986 acpi_boot_table_init(); 987 988 early_acpi_boot_init(); 989 990 #ifdef CONFIG_ACPI_NUMA 991 /* 992 * Parse SRAT to discover nodes. 993 */ 994 acpi = acpi_numa_init(); 995 #endif 996 997 #ifdef CONFIG_K8_NUMA 998 if (!acpi) 999 k8 = !k8_numa_init(0, max_pfn); 1000 #endif 1001 1002 initmem_init(0, max_pfn, acpi, k8); 1003 #ifndef CONFIG_NO_BOOTMEM 1004 early_res_to_bootmem(0, max_low_pfn<<PAGE_SHIFT); 1005 #endif 1006 1007 dma32_reserve_bootmem(); 1008 1009 #ifdef CONFIG_KVM_CLOCK 1010 kvmclock_init(); 1011 #endif 1012 1013 x86_init.paging.pagetable_setup_start(swapper_pg_dir); 1014 paging_init(); 1015 x86_init.paging.pagetable_setup_done(swapper_pg_dir); 1016 1017 tboot_probe(); 1018 1019 #ifdef CONFIG_X86_64 1020 map_vsyscall(); 1021 #endif 1022 1023 generic_apic_probe(); 1024 1025 early_quirks(); 1026 1027 /* 1028 * Read APIC and some other early information from ACPI tables. 1029 */ 1030 acpi_boot_init(); 1031 1032 sfi_init(); 1033 1034 /* 1035 * get boot-time SMP configuration: 1036 */ 1037 if (smp_found_config) 1038 get_smp_config(); 1039 1040 prefill_possible_map(); 1041 1042 #ifdef CONFIG_X86_64 1043 init_cpu_to_node(); 1044 #endif 1045 1046 init_apic_mappings(); 1047 ioapic_init_mappings(); 1048 1049 /* need to wait for io_apic is mapped */ 1050 probe_nr_irqs_gsi(); 1051 1052 kvm_guest_init(); 1053 1054 e820_reserve_resources(); 1055 e820_mark_nosave_regions(max_low_pfn); 1056 1057 x86_init.resources.reserve_resources(); 1058 1059 e820_setup_gap(); 1060 1061 #ifdef CONFIG_VT 1062 #if defined(CONFIG_VGA_CONSOLE) 1063 if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY)) 1064 conswitchp = &vga_con; 1065 #elif defined(CONFIG_DUMMY_CONSOLE) 1066 conswitchp = &dummy_con; 1067 #endif 1068 #endif 1069 x86_init.oem.banner(); 1070 1071 mcheck_init(); 1072 } 1073 1074 #ifdef CONFIG_X86_32 1075 1076 static struct resource video_ram_resource = { 1077 .name = "Video RAM area", 1078 .start = 0xa0000, 1079 .end = 0xbffff, 1080 .flags = IORESOURCE_BUSY | IORESOURCE_MEM 1081 }; 1082 1083 void __init i386_reserve_resources(void) 1084 { 1085 request_resource(&iomem_resource, &video_ram_resource); 1086 reserve_standard_io_resources(); 1087 } 1088 1089 #endif /* CONFIG_X86_32 */ 1090