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