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/memblock.h> 35 #include <linux/seq_file.h> 36 #include <linux/console.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 #include <linux/dma-contiguous.h> 53 54 #include <linux/errno.h> 55 #include <linux/kernel.h> 56 #include <linux/stddef.h> 57 #include <linux/unistd.h> 58 #include <linux/ptrace.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 #include <linux/jiffies.h> 72 73 #include <video/edid.h> 74 75 #include <asm/mtrr.h> 76 #include <asm/apic.h> 77 #include <asm/realmode.h> 78 #include <asm/e820.h> 79 #include <asm/mpspec.h> 80 #include <asm/setup.h> 81 #include <asm/efi.h> 82 #include <asm/timer.h> 83 #include <asm/i8259.h> 84 #include <asm/sections.h> 85 #include <asm/io_apic.h> 86 #include <asm/ist.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/vsyscall.h> 94 #include <asm/cpu.h> 95 #include <asm/desc.h> 96 #include <asm/dma.h> 97 #include <asm/iommu.h> 98 #include <asm/gart.h> 99 #include <asm/mmu_context.h> 100 #include <asm/proto.h> 101 102 #include <asm/paravirt.h> 103 #include <asm/hypervisor.h> 104 #include <asm/olpc_ofw.h> 105 106 #include <asm/percpu.h> 107 #include <asm/topology.h> 108 #include <asm/apicdef.h> 109 #include <asm/amd_nb.h> 110 #include <asm/mce.h> 111 #include <asm/alternative.h> 112 #include <asm/prom.h> 113 114 /* 115 * max_low_pfn_mapped: highest direct mapped pfn under 4GB 116 * max_pfn_mapped: highest direct mapped pfn over 4GB 117 * 118 * The direct mapping only covers E820_RAM regions, so the ranges and gaps are 119 * represented by pfn_mapped 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 127 128 129 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 struct boot_params boot_params; 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 = { 174 .wp_works_ok = -1, 175 }; 176 /* common cpu data for all cpus */ 177 struct cpuinfo_x86 boot_cpu_data __read_mostly = { 178 .wp_works_ok = -1, 179 }; 180 EXPORT_SYMBOL(boot_cpu_data); 181 182 unsigned int def_to_bigsmp; 183 184 /* for MCA, but anyone else can use it if they want */ 185 unsigned int machine_id; 186 unsigned int machine_submodel_id; 187 unsigned int BIOS_revision; 188 189 struct apm_info apm_info; 190 EXPORT_SYMBOL(apm_info); 191 192 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \ 193 defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE) 194 struct ist_info ist_info; 195 EXPORT_SYMBOL(ist_info); 196 #else 197 struct ist_info ist_info; 198 #endif 199 200 #else 201 struct cpuinfo_x86 boot_cpu_data __read_mostly = { 202 .x86_phys_bits = MAX_PHYSMEM_BITS, 203 }; 204 EXPORT_SYMBOL(boot_cpu_data); 205 #endif 206 207 208 #if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64) 209 __visible unsigned long mmu_cr4_features; 210 #else 211 __visible unsigned long mmu_cr4_features = X86_CR4_PAE; 212 #endif 213 214 /* Boot loader ID and version as integers, for the benefit of proc_dointvec */ 215 int bootloader_type, bootloader_version; 216 217 /* 218 * Setup options 219 */ 220 struct screen_info screen_info; 221 EXPORT_SYMBOL(screen_info); 222 struct edid_info edid_info; 223 EXPORT_SYMBOL_GPL(edid_info); 224 225 extern int root_mountflags; 226 227 unsigned long saved_video_mode; 228 229 #define RAMDISK_IMAGE_START_MASK 0x07FF 230 #define RAMDISK_PROMPT_FLAG 0x8000 231 #define RAMDISK_LOAD_FLAG 0x4000 232 233 static char __initdata command_line[COMMAND_LINE_SIZE]; 234 #ifdef CONFIG_CMDLINE_BOOL 235 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE; 236 #endif 237 238 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE) 239 struct edd edd; 240 #ifdef CONFIG_EDD_MODULE 241 EXPORT_SYMBOL(edd); 242 #endif 243 /** 244 * copy_edd() - Copy the BIOS EDD information 245 * from boot_params into a safe place. 246 * 247 */ 248 static inline void __init copy_edd(void) 249 { 250 memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer, 251 sizeof(edd.mbr_signature)); 252 memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info)); 253 edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries; 254 edd.edd_info_nr = boot_params.eddbuf_entries; 255 } 256 #else 257 static inline void __init copy_edd(void) 258 { 259 } 260 #endif 261 262 void * __init extend_brk(size_t size, size_t align) 263 { 264 size_t mask = align - 1; 265 void *ret; 266 267 BUG_ON(_brk_start == 0); 268 BUG_ON(align & mask); 269 270 _brk_end = (_brk_end + mask) & ~mask; 271 BUG_ON((char *)(_brk_end + size) > __brk_limit); 272 273 ret = (void *)_brk_end; 274 _brk_end += size; 275 276 memset(ret, 0, size); 277 278 return ret; 279 } 280 281 #ifdef CONFIG_X86_32 282 static void __init cleanup_highmap(void) 283 { 284 } 285 #endif 286 287 static void __init reserve_brk(void) 288 { 289 if (_brk_end > _brk_start) 290 memblock_reserve(__pa_symbol(_brk_start), 291 _brk_end - _brk_start); 292 293 /* Mark brk area as locked down and no longer taking any 294 new allocations */ 295 _brk_start = 0; 296 } 297 298 u64 relocated_ramdisk; 299 300 #ifdef CONFIG_BLK_DEV_INITRD 301 302 static u64 __init get_ramdisk_image(void) 303 { 304 u64 ramdisk_image = boot_params.hdr.ramdisk_image; 305 306 ramdisk_image |= (u64)boot_params.ext_ramdisk_image << 32; 307 308 return ramdisk_image; 309 } 310 static u64 __init get_ramdisk_size(void) 311 { 312 u64 ramdisk_size = boot_params.hdr.ramdisk_size; 313 314 ramdisk_size |= (u64)boot_params.ext_ramdisk_size << 32; 315 316 return ramdisk_size; 317 } 318 319 #define MAX_MAP_CHUNK (NR_FIX_BTMAPS << PAGE_SHIFT) 320 static void __init relocate_initrd(void) 321 { 322 /* Assume only end is not page aligned */ 323 u64 ramdisk_image = get_ramdisk_image(); 324 u64 ramdisk_size = get_ramdisk_size(); 325 u64 area_size = PAGE_ALIGN(ramdisk_size); 326 unsigned long slop, clen, mapaddr; 327 char *p, *q; 328 329 /* We need to move the initrd down into directly mapped mem */ 330 relocated_ramdisk = memblock_find_in_range(0, PFN_PHYS(max_pfn_mapped), 331 area_size, PAGE_SIZE); 332 333 if (!relocated_ramdisk) 334 panic("Cannot find place for new RAMDISK of size %lld\n", 335 ramdisk_size); 336 337 /* Note: this includes all the mem currently occupied by 338 the initrd, we rely on that fact to keep the data intact. */ 339 memblock_reserve(relocated_ramdisk, area_size); 340 initrd_start = relocated_ramdisk + PAGE_OFFSET; 341 initrd_end = initrd_start + ramdisk_size; 342 printk(KERN_INFO "Allocated new RAMDISK: [mem %#010llx-%#010llx]\n", 343 relocated_ramdisk, relocated_ramdisk + ramdisk_size - 1); 344 345 q = (char *)initrd_start; 346 347 /* Copy the initrd */ 348 while (ramdisk_size) { 349 slop = ramdisk_image & ~PAGE_MASK; 350 clen = ramdisk_size; 351 if (clen > MAX_MAP_CHUNK-slop) 352 clen = MAX_MAP_CHUNK-slop; 353 mapaddr = ramdisk_image & PAGE_MASK; 354 p = early_memremap(mapaddr, clen+slop); 355 memcpy(q, p+slop, clen); 356 early_iounmap(p, clen+slop); 357 q += clen; 358 ramdisk_image += clen; 359 ramdisk_size -= clen; 360 } 361 362 ramdisk_image = get_ramdisk_image(); 363 ramdisk_size = get_ramdisk_size(); 364 printk(KERN_INFO "Move RAMDISK from [mem %#010llx-%#010llx] to" 365 " [mem %#010llx-%#010llx]\n", 366 ramdisk_image, ramdisk_image + ramdisk_size - 1, 367 relocated_ramdisk, relocated_ramdisk + ramdisk_size - 1); 368 } 369 370 static void __init early_reserve_initrd(void) 371 { 372 /* Assume only end is not page aligned */ 373 u64 ramdisk_image = get_ramdisk_image(); 374 u64 ramdisk_size = get_ramdisk_size(); 375 u64 ramdisk_end = PAGE_ALIGN(ramdisk_image + ramdisk_size); 376 377 if (!boot_params.hdr.type_of_loader || 378 !ramdisk_image || !ramdisk_size) 379 return; /* No initrd provided by bootloader */ 380 381 memblock_reserve(ramdisk_image, ramdisk_end - ramdisk_image); 382 } 383 static void __init reserve_initrd(void) 384 { 385 /* Assume only end is not page aligned */ 386 u64 ramdisk_image = get_ramdisk_image(); 387 u64 ramdisk_size = get_ramdisk_size(); 388 u64 ramdisk_end = PAGE_ALIGN(ramdisk_image + ramdisk_size); 389 u64 mapped_size; 390 391 if (!boot_params.hdr.type_of_loader || 392 !ramdisk_image || !ramdisk_size) 393 return; /* No initrd provided by bootloader */ 394 395 initrd_start = 0; 396 397 mapped_size = memblock_mem_size(max_pfn_mapped); 398 if (ramdisk_size >= (mapped_size>>1)) 399 panic("initrd too large to handle, " 400 "disabling initrd (%lld needed, %lld available)\n", 401 ramdisk_size, mapped_size>>1); 402 403 printk(KERN_INFO "RAMDISK: [mem %#010llx-%#010llx]\n", ramdisk_image, 404 ramdisk_end - 1); 405 406 if (pfn_range_is_mapped(PFN_DOWN(ramdisk_image), 407 PFN_DOWN(ramdisk_end))) { 408 /* All are mapped, easy case */ 409 initrd_start = ramdisk_image + PAGE_OFFSET; 410 initrd_end = initrd_start + ramdisk_size; 411 return; 412 } 413 414 relocate_initrd(); 415 416 memblock_free(ramdisk_image, ramdisk_end - ramdisk_image); 417 } 418 #else 419 static void __init early_reserve_initrd(void) 420 { 421 } 422 static void __init reserve_initrd(void) 423 { 424 } 425 #endif /* CONFIG_BLK_DEV_INITRD */ 426 427 static void __init parse_setup_data(void) 428 { 429 struct setup_data *data; 430 u64 pa_data, pa_next; 431 432 pa_data = boot_params.hdr.setup_data; 433 while (pa_data) { 434 u32 data_len, map_len, data_type; 435 436 map_len = max(PAGE_SIZE - (pa_data & ~PAGE_MASK), 437 (u64)sizeof(struct setup_data)); 438 data = early_memremap(pa_data, map_len); 439 data_len = data->len + sizeof(struct setup_data); 440 data_type = data->type; 441 pa_next = data->next; 442 early_iounmap(data, map_len); 443 444 switch (data_type) { 445 case SETUP_E820_EXT: 446 parse_e820_ext(pa_data, data_len); 447 break; 448 case SETUP_DTB: 449 add_dtb(pa_data); 450 break; 451 case SETUP_EFI: 452 parse_efi_setup(pa_data, data_len); 453 break; 454 default: 455 break; 456 } 457 pa_data = pa_next; 458 } 459 } 460 461 static void __init e820_reserve_setup_data(void) 462 { 463 struct setup_data *data; 464 u64 pa_data; 465 int found = 0; 466 467 pa_data = boot_params.hdr.setup_data; 468 while (pa_data) { 469 data = early_memremap(pa_data, sizeof(*data)); 470 e820_update_range(pa_data, sizeof(*data)+data->len, 471 E820_RAM, E820_RESERVED_KERN); 472 found = 1; 473 pa_data = data->next; 474 early_iounmap(data, sizeof(*data)); 475 } 476 if (!found) 477 return; 478 479 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); 480 memcpy(&e820_saved, &e820, sizeof(struct e820map)); 481 printk(KERN_INFO "extended physical RAM map:\n"); 482 e820_print_map("reserve setup_data"); 483 } 484 485 static void __init memblock_x86_reserve_range_setup_data(void) 486 { 487 struct setup_data *data; 488 u64 pa_data; 489 490 pa_data = boot_params.hdr.setup_data; 491 while (pa_data) { 492 data = early_memremap(pa_data, sizeof(*data)); 493 memblock_reserve(pa_data, sizeof(*data) + data->len); 494 pa_data = data->next; 495 early_iounmap(data, sizeof(*data)); 496 } 497 } 498 499 /* 500 * --------- Crashkernel reservation ------------------------------ 501 */ 502 503 #ifdef CONFIG_KEXEC 504 505 /* 506 * Keep the crash kernel below this limit. On 32 bits earlier kernels 507 * would limit the kernel to the low 512 MiB due to mapping restrictions. 508 * On 64bit, old kexec-tools need to under 896MiB. 509 */ 510 #ifdef CONFIG_X86_32 511 # define CRASH_KERNEL_ADDR_LOW_MAX (512 << 20) 512 # define CRASH_KERNEL_ADDR_HIGH_MAX (512 << 20) 513 #else 514 # define CRASH_KERNEL_ADDR_LOW_MAX (896UL<<20) 515 # define CRASH_KERNEL_ADDR_HIGH_MAX MAXMEM 516 #endif 517 518 static void __init reserve_crashkernel_low(void) 519 { 520 #ifdef CONFIG_X86_64 521 const unsigned long long alignment = 16<<20; /* 16M */ 522 unsigned long long low_base = 0, low_size = 0; 523 unsigned long total_low_mem; 524 unsigned long long base; 525 bool auto_set = false; 526 int ret; 527 528 total_low_mem = memblock_mem_size(1UL<<(32-PAGE_SHIFT)); 529 /* crashkernel=Y,low */ 530 ret = parse_crashkernel_low(boot_command_line, total_low_mem, 531 &low_size, &base); 532 if (ret != 0) { 533 /* 534 * two parts from lib/swiotlb.c: 535 * swiotlb size: user specified with swiotlb= or default. 536 * swiotlb overflow buffer: now is hardcoded to 32k. 537 * We round it to 8M for other buffers that 538 * may need to stay low too. 539 */ 540 low_size = swiotlb_size_or_default() + (8UL<<20); 541 auto_set = true; 542 } else { 543 /* passed with crashkernel=0,low ? */ 544 if (!low_size) 545 return; 546 } 547 548 low_base = memblock_find_in_range(low_size, (1ULL<<32), 549 low_size, alignment); 550 551 if (!low_base) { 552 if (!auto_set) 553 pr_info("crashkernel low reservation failed - No suitable area found.\n"); 554 555 return; 556 } 557 558 memblock_reserve(low_base, low_size); 559 pr_info("Reserving %ldMB of low memory at %ldMB for crashkernel (System low RAM: %ldMB)\n", 560 (unsigned long)(low_size >> 20), 561 (unsigned long)(low_base >> 20), 562 (unsigned long)(total_low_mem >> 20)); 563 crashk_low_res.start = low_base; 564 crashk_low_res.end = low_base + low_size - 1; 565 insert_resource(&iomem_resource, &crashk_low_res); 566 #endif 567 } 568 569 static void __init reserve_crashkernel(void) 570 { 571 const unsigned long long alignment = 16<<20; /* 16M */ 572 unsigned long long total_mem; 573 unsigned long long crash_size, crash_base; 574 bool high = false; 575 int ret; 576 577 total_mem = memblock_phys_mem_size(); 578 579 /* crashkernel=XM */ 580 ret = parse_crashkernel(boot_command_line, total_mem, 581 &crash_size, &crash_base); 582 if (ret != 0 || crash_size <= 0) { 583 /* crashkernel=X,high */ 584 ret = parse_crashkernel_high(boot_command_line, total_mem, 585 &crash_size, &crash_base); 586 if (ret != 0 || crash_size <= 0) 587 return; 588 high = true; 589 } 590 591 /* 0 means: find the address automatically */ 592 if (crash_base <= 0) { 593 /* 594 * kexec want bzImage is below CRASH_KERNEL_ADDR_MAX 595 */ 596 crash_base = memblock_find_in_range(alignment, 597 high ? CRASH_KERNEL_ADDR_HIGH_MAX : 598 CRASH_KERNEL_ADDR_LOW_MAX, 599 crash_size, alignment); 600 601 if (!crash_base) { 602 pr_info("crashkernel reservation failed - No suitable area found.\n"); 603 return; 604 } 605 606 } else { 607 unsigned long long start; 608 609 start = memblock_find_in_range(crash_base, 610 crash_base + crash_size, crash_size, 1<<20); 611 if (start != crash_base) { 612 pr_info("crashkernel reservation failed - memory is in use.\n"); 613 return; 614 } 615 } 616 memblock_reserve(crash_base, crash_size); 617 618 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB " 619 "for crashkernel (System RAM: %ldMB)\n", 620 (unsigned long)(crash_size >> 20), 621 (unsigned long)(crash_base >> 20), 622 (unsigned long)(total_mem >> 20)); 623 624 crashk_res.start = crash_base; 625 crashk_res.end = crash_base + crash_size - 1; 626 insert_resource(&iomem_resource, &crashk_res); 627 628 if (crash_base >= (1ULL<<32)) 629 reserve_crashkernel_low(); 630 } 631 #else 632 static void __init reserve_crashkernel(void) 633 { 634 } 635 #endif 636 637 static struct resource standard_io_resources[] = { 638 { .name = "dma1", .start = 0x00, .end = 0x1f, 639 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 640 { .name = "pic1", .start = 0x20, .end = 0x21, 641 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 642 { .name = "timer0", .start = 0x40, .end = 0x43, 643 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 644 { .name = "timer1", .start = 0x50, .end = 0x53, 645 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 646 { .name = "keyboard", .start = 0x60, .end = 0x60, 647 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 648 { .name = "keyboard", .start = 0x64, .end = 0x64, 649 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 650 { .name = "dma page reg", .start = 0x80, .end = 0x8f, 651 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 652 { .name = "pic2", .start = 0xa0, .end = 0xa1, 653 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 654 { .name = "dma2", .start = 0xc0, .end = 0xdf, 655 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 656 { .name = "fpu", .start = 0xf0, .end = 0xff, 657 .flags = IORESOURCE_BUSY | IORESOURCE_IO } 658 }; 659 660 void __init reserve_standard_io_resources(void) 661 { 662 int i; 663 664 /* request I/O space for devices used on all i[345]86 PCs */ 665 for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++) 666 request_resource(&ioport_resource, &standard_io_resources[i]); 667 668 } 669 670 static __init void reserve_ibft_region(void) 671 { 672 unsigned long addr, size = 0; 673 674 addr = find_ibft_region(&size); 675 676 if (size) 677 memblock_reserve(addr, size); 678 } 679 680 static bool __init snb_gfx_workaround_needed(void) 681 { 682 #ifdef CONFIG_PCI 683 int i; 684 u16 vendor, devid; 685 static const __initconst u16 snb_ids[] = { 686 0x0102, 687 0x0112, 688 0x0122, 689 0x0106, 690 0x0116, 691 0x0126, 692 0x010a, 693 }; 694 695 /* Assume no if something weird is going on with PCI */ 696 if (!early_pci_allowed()) 697 return false; 698 699 vendor = read_pci_config_16(0, 2, 0, PCI_VENDOR_ID); 700 if (vendor != 0x8086) 701 return false; 702 703 devid = read_pci_config_16(0, 2, 0, PCI_DEVICE_ID); 704 for (i = 0; i < ARRAY_SIZE(snb_ids); i++) 705 if (devid == snb_ids[i]) 706 return true; 707 #endif 708 709 return false; 710 } 711 712 /* 713 * Sandy Bridge graphics has trouble with certain ranges, exclude 714 * them from allocation. 715 */ 716 static void __init trim_snb_memory(void) 717 { 718 static const __initconst unsigned long bad_pages[] = { 719 0x20050000, 720 0x20110000, 721 0x20130000, 722 0x20138000, 723 0x40004000, 724 }; 725 int i; 726 727 if (!snb_gfx_workaround_needed()) 728 return; 729 730 printk(KERN_DEBUG "reserving inaccessible SNB gfx pages\n"); 731 732 /* 733 * Reserve all memory below the 1 MB mark that has not 734 * already been reserved. 735 */ 736 memblock_reserve(0, 1<<20); 737 738 for (i = 0; i < ARRAY_SIZE(bad_pages); i++) { 739 if (memblock_reserve(bad_pages[i], PAGE_SIZE)) 740 printk(KERN_WARNING "failed to reserve 0x%08lx\n", 741 bad_pages[i]); 742 } 743 } 744 745 /* 746 * Here we put platform-specific memory range workarounds, i.e. 747 * memory known to be corrupt or otherwise in need to be reserved on 748 * specific platforms. 749 * 750 * If this gets used more widely it could use a real dispatch mechanism. 751 */ 752 static void __init trim_platform_memory_ranges(void) 753 { 754 trim_snb_memory(); 755 } 756 757 static void __init trim_bios_range(void) 758 { 759 /* 760 * A special case is the first 4Kb of memory; 761 * This is a BIOS owned area, not kernel ram, but generally 762 * not listed as such in the E820 table. 763 * 764 * This typically reserves additional memory (64KiB by default) 765 * since some BIOSes are known to corrupt low memory. See the 766 * Kconfig help text for X86_RESERVE_LOW. 767 */ 768 e820_update_range(0, PAGE_SIZE, E820_RAM, E820_RESERVED); 769 770 /* 771 * special case: Some BIOSen report the PC BIOS 772 * area (640->1Mb) as ram even though it is not. 773 * take them out. 774 */ 775 e820_remove_range(BIOS_BEGIN, BIOS_END - BIOS_BEGIN, E820_RAM, 1); 776 777 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); 778 } 779 780 /* called before trim_bios_range() to spare extra sanitize */ 781 static void __init e820_add_kernel_range(void) 782 { 783 u64 start = __pa_symbol(_text); 784 u64 size = __pa_symbol(_end) - start; 785 786 /* 787 * Complain if .text .data and .bss are not marked as E820_RAM and 788 * attempt to fix it by adding the range. We may have a confused BIOS, 789 * or the user may have used memmap=exactmap or memmap=xxM$yyM to 790 * exclude kernel range. If we really are running on top non-RAM, 791 * we will crash later anyways. 792 */ 793 if (e820_all_mapped(start, start + size, E820_RAM)) 794 return; 795 796 pr_warn(".text .data .bss are not marked as E820_RAM!\n"); 797 e820_remove_range(start, size, E820_RAM, 0); 798 e820_add_region(start, size, E820_RAM); 799 } 800 801 static unsigned reserve_low = CONFIG_X86_RESERVE_LOW << 10; 802 803 static int __init parse_reservelow(char *p) 804 { 805 unsigned long long size; 806 807 if (!p) 808 return -EINVAL; 809 810 size = memparse(p, &p); 811 812 if (size < 4096) 813 size = 4096; 814 815 if (size > 640*1024) 816 size = 640*1024; 817 818 reserve_low = size; 819 820 return 0; 821 } 822 823 early_param("reservelow", parse_reservelow); 824 825 static void __init trim_low_memory_range(void) 826 { 827 memblock_reserve(0, ALIGN(reserve_low, PAGE_SIZE)); 828 } 829 830 /* 831 * Dump out kernel offset information on panic. 832 */ 833 static int 834 dump_kernel_offset(struct notifier_block *self, unsigned long v, void *p) 835 { 836 pr_emerg("Kernel Offset: 0x%lx from 0x%lx " 837 "(relocation range: 0x%lx-0x%lx)\n", 838 (unsigned long)&_text - __START_KERNEL, __START_KERNEL, 839 __START_KERNEL_map, MODULES_VADDR-1); 840 841 return 0; 842 } 843 844 /* 845 * Determine if we were loaded by an EFI loader. If so, then we have also been 846 * passed the efi memmap, systab, etc., so we should use these data structures 847 * for initialization. Note, the efi init code path is determined by the 848 * global efi_enabled. This allows the same kernel image to be used on existing 849 * systems (with a traditional BIOS) as well as on EFI systems. 850 */ 851 /* 852 * setup_arch - architecture-specific boot-time initializations 853 * 854 * Note: On x86_64, fixmaps are ready for use even before this is called. 855 */ 856 857 void __init setup_arch(char **cmdline_p) 858 { 859 memblock_reserve(__pa_symbol(_text), 860 (unsigned long)__bss_stop - (unsigned long)_text); 861 862 early_reserve_initrd(); 863 864 /* 865 * At this point everything still needed from the boot loader 866 * or BIOS or kernel text should be early reserved or marked not 867 * RAM in e820. All other memory is free game. 868 */ 869 870 #ifdef CONFIG_X86_32 871 memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data)); 872 visws_early_detect(); 873 874 /* 875 * copy kernel address range established so far and switch 876 * to the proper swapper page table 877 */ 878 clone_pgd_range(swapper_pg_dir + KERNEL_PGD_BOUNDARY, 879 initial_page_table + KERNEL_PGD_BOUNDARY, 880 KERNEL_PGD_PTRS); 881 882 load_cr3(swapper_pg_dir); 883 __flush_tlb_all(); 884 #else 885 printk(KERN_INFO "Command line: %s\n", boot_command_line); 886 #endif 887 888 /* 889 * If we have OLPC OFW, we might end up relocating the fixmap due to 890 * reserve_top(), so do this before touching the ioremap area. 891 */ 892 olpc_ofw_detect(); 893 894 early_trap_init(); 895 early_cpu_init(); 896 early_ioremap_init(); 897 898 setup_olpc_ofw_pgd(); 899 900 ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev); 901 screen_info = boot_params.screen_info; 902 edid_info = boot_params.edid_info; 903 #ifdef CONFIG_X86_32 904 apm_info.bios = boot_params.apm_bios_info; 905 ist_info = boot_params.ist_info; 906 if (boot_params.sys_desc_table.length != 0) { 907 machine_id = boot_params.sys_desc_table.table[0]; 908 machine_submodel_id = boot_params.sys_desc_table.table[1]; 909 BIOS_revision = boot_params.sys_desc_table.table[2]; 910 } 911 #endif 912 saved_video_mode = boot_params.hdr.vid_mode; 913 bootloader_type = boot_params.hdr.type_of_loader; 914 if ((bootloader_type >> 4) == 0xe) { 915 bootloader_type &= 0xf; 916 bootloader_type |= (boot_params.hdr.ext_loader_type+0x10) << 4; 917 } 918 bootloader_version = bootloader_type & 0xf; 919 bootloader_version |= boot_params.hdr.ext_loader_ver << 4; 920 921 #ifdef CONFIG_BLK_DEV_RAM 922 rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK; 923 rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0); 924 rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0); 925 #endif 926 #ifdef CONFIG_EFI 927 if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature, 928 "EL32", 4)) { 929 set_bit(EFI_BOOT, &x86_efi_facility); 930 } else if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature, 931 "EL64", 4)) { 932 set_bit(EFI_BOOT, &x86_efi_facility); 933 set_bit(EFI_64BIT, &x86_efi_facility); 934 } 935 936 if (efi_enabled(EFI_BOOT)) 937 efi_memblock_x86_reserve_range(); 938 #endif 939 940 x86_init.oem.arch_setup(); 941 942 iomem_resource.end = (1ULL << boot_cpu_data.x86_phys_bits) - 1; 943 setup_memory_map(); 944 parse_setup_data(); 945 946 copy_edd(); 947 948 if (!boot_params.hdr.root_flags) 949 root_mountflags &= ~MS_RDONLY; 950 init_mm.start_code = (unsigned long) _text; 951 init_mm.end_code = (unsigned long) _etext; 952 init_mm.end_data = (unsigned long) _edata; 953 init_mm.brk = _brk_end; 954 955 code_resource.start = __pa_symbol(_text); 956 code_resource.end = __pa_symbol(_etext)-1; 957 data_resource.start = __pa_symbol(_etext); 958 data_resource.end = __pa_symbol(_edata)-1; 959 bss_resource.start = __pa_symbol(__bss_start); 960 bss_resource.end = __pa_symbol(__bss_stop)-1; 961 962 #ifdef CONFIG_CMDLINE_BOOL 963 #ifdef CONFIG_CMDLINE_OVERRIDE 964 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE); 965 #else 966 if (builtin_cmdline[0]) { 967 /* append boot loader cmdline to builtin */ 968 strlcat(builtin_cmdline, " ", COMMAND_LINE_SIZE); 969 strlcat(builtin_cmdline, boot_command_line, COMMAND_LINE_SIZE); 970 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE); 971 } 972 #endif 973 #endif 974 975 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE); 976 *cmdline_p = command_line; 977 978 /* 979 * x86_configure_nx() is called before parse_early_param() to detect 980 * whether hardware doesn't support NX (so that the early EHCI debug 981 * console setup can safely call set_fixmap()). It may then be called 982 * again from within noexec_setup() during parsing early parameters 983 * to honor the respective command line option. 984 */ 985 x86_configure_nx(); 986 987 parse_early_param(); 988 989 x86_report_nx(); 990 991 /* after early param, so could get panic from serial */ 992 memblock_x86_reserve_range_setup_data(); 993 994 if (acpi_mps_check()) { 995 #ifdef CONFIG_X86_LOCAL_APIC 996 disable_apic = 1; 997 #endif 998 setup_clear_cpu_cap(X86_FEATURE_APIC); 999 } 1000 1001 #ifdef CONFIG_PCI 1002 if (pci_early_dump_regs) 1003 early_dump_pci_devices(); 1004 #endif 1005 1006 /* update the e820_saved too */ 1007 e820_reserve_setup_data(); 1008 finish_e820_parsing(); 1009 1010 if (efi_enabled(EFI_BOOT)) 1011 efi_init(); 1012 1013 dmi_scan_machine(); 1014 dmi_memdev_walk(); 1015 dmi_set_dump_stack_arch_desc(); 1016 1017 /* 1018 * VMware detection requires dmi to be available, so this 1019 * needs to be done after dmi_scan_machine, for the BP. 1020 */ 1021 init_hypervisor_platform(); 1022 1023 x86_init.resources.probe_roms(); 1024 1025 /* after parse_early_param, so could debug it */ 1026 insert_resource(&iomem_resource, &code_resource); 1027 insert_resource(&iomem_resource, &data_resource); 1028 insert_resource(&iomem_resource, &bss_resource); 1029 1030 e820_add_kernel_range(); 1031 trim_bios_range(); 1032 #ifdef CONFIG_X86_32 1033 if (ppro_with_ram_bug()) { 1034 e820_update_range(0x70000000ULL, 0x40000ULL, E820_RAM, 1035 E820_RESERVED); 1036 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); 1037 printk(KERN_INFO "fixed physical RAM map:\n"); 1038 e820_print_map("bad_ppro"); 1039 } 1040 #else 1041 early_gart_iommu_check(); 1042 #endif 1043 1044 /* 1045 * partially used pages are not usable - thus 1046 * we are rounding upwards: 1047 */ 1048 max_pfn = e820_end_of_ram_pfn(); 1049 1050 /* update e820 for memory not covered by WB MTRRs */ 1051 mtrr_bp_init(); 1052 if (mtrr_trim_uncached_memory(max_pfn)) 1053 max_pfn = e820_end_of_ram_pfn(); 1054 1055 #ifdef CONFIG_X86_32 1056 /* max_low_pfn get updated here */ 1057 find_low_pfn_range(); 1058 #else 1059 check_x2apic(); 1060 1061 /* How many end-of-memory variables you have, grandma! */ 1062 /* need this before calling reserve_initrd */ 1063 if (max_pfn > (1UL<<(32 - PAGE_SHIFT))) 1064 max_low_pfn = e820_end_of_low_ram_pfn(); 1065 else 1066 max_low_pfn = max_pfn; 1067 1068 high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1; 1069 #endif 1070 1071 /* 1072 * Find and reserve possible boot-time SMP configuration: 1073 */ 1074 find_smp_config(); 1075 1076 reserve_ibft_region(); 1077 1078 early_alloc_pgt_buf(); 1079 1080 /* 1081 * Need to conclude brk, before memblock_x86_fill() 1082 * it could use memblock_find_in_range, could overlap with 1083 * brk area. 1084 */ 1085 reserve_brk(); 1086 1087 cleanup_highmap(); 1088 1089 memblock_set_current_limit(ISA_END_ADDRESS); 1090 memblock_x86_fill(); 1091 1092 /* 1093 * The EFI specification says that boot service code won't be called 1094 * after ExitBootServices(). This is, in fact, a lie. 1095 */ 1096 if (efi_enabled(EFI_MEMMAP)) 1097 efi_reserve_boot_services(); 1098 1099 /* preallocate 4k for mptable mpc */ 1100 early_reserve_e820_mpc_new(); 1101 1102 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION 1103 setup_bios_corruption_check(); 1104 #endif 1105 1106 #ifdef CONFIG_X86_32 1107 printk(KERN_DEBUG "initial memory mapped: [mem 0x00000000-%#010lx]\n", 1108 (max_pfn_mapped<<PAGE_SHIFT) - 1); 1109 #endif 1110 1111 reserve_real_mode(); 1112 1113 trim_platform_memory_ranges(); 1114 trim_low_memory_range(); 1115 1116 init_mem_mapping(); 1117 1118 early_trap_pf_init(); 1119 1120 setup_real_mode(); 1121 1122 memblock_set_current_limit(get_max_mapped()); 1123 dma_contiguous_reserve(0); 1124 1125 /* 1126 * NOTE: On x86-32, only from this point on, fixmaps are ready for use. 1127 */ 1128 1129 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT 1130 if (init_ohci1394_dma_early) 1131 init_ohci1394_dma_on_all_controllers(); 1132 #endif 1133 /* Allocate bigger log buffer */ 1134 setup_log_buf(1); 1135 1136 reserve_initrd(); 1137 1138 #if defined(CONFIG_ACPI) && defined(CONFIG_BLK_DEV_INITRD) 1139 acpi_initrd_override((void *)initrd_start, initrd_end - initrd_start); 1140 #endif 1141 1142 vsmp_init(); 1143 1144 io_delay_init(); 1145 1146 /* 1147 * Parse the ACPI tables for possible boot-time SMP configuration. 1148 */ 1149 acpi_boot_table_init(); 1150 1151 early_acpi_boot_init(); 1152 1153 initmem_init(); 1154 1155 /* 1156 * Reserve memory for crash kernel after SRAT is parsed so that it 1157 * won't consume hotpluggable memory. 1158 */ 1159 reserve_crashkernel(); 1160 1161 memblock_find_dma_reserve(); 1162 1163 #ifdef CONFIG_KVM_GUEST 1164 kvmclock_init(); 1165 #endif 1166 1167 x86_init.paging.pagetable_init(); 1168 1169 if (boot_cpu_data.cpuid_level >= 0) { 1170 /* A CPU has %cr4 if and only if it has CPUID */ 1171 mmu_cr4_features = read_cr4(); 1172 if (trampoline_cr4_features) 1173 *trampoline_cr4_features = mmu_cr4_features; 1174 } 1175 1176 #ifdef CONFIG_X86_32 1177 /* sync back kernel address range */ 1178 clone_pgd_range(initial_page_table + KERNEL_PGD_BOUNDARY, 1179 swapper_pg_dir + KERNEL_PGD_BOUNDARY, 1180 KERNEL_PGD_PTRS); 1181 #endif 1182 1183 tboot_probe(); 1184 1185 #ifdef CONFIG_X86_64 1186 map_vsyscall(); 1187 #endif 1188 1189 generic_apic_probe(); 1190 1191 early_quirks(); 1192 1193 /* 1194 * Read APIC and some other early information from ACPI tables. 1195 */ 1196 acpi_boot_init(); 1197 sfi_init(); 1198 x86_dtb_init(); 1199 1200 /* 1201 * get boot-time SMP configuration: 1202 */ 1203 if (smp_found_config) 1204 get_smp_config(); 1205 1206 prefill_possible_map(); 1207 1208 init_cpu_to_node(); 1209 1210 init_apic_mappings(); 1211 if (x86_io_apic_ops.init) 1212 x86_io_apic_ops.init(); 1213 1214 kvm_guest_init(); 1215 1216 e820_reserve_resources(); 1217 e820_mark_nosave_regions(max_low_pfn); 1218 1219 x86_init.resources.reserve_resources(); 1220 1221 e820_setup_gap(); 1222 1223 #ifdef CONFIG_VT 1224 #if defined(CONFIG_VGA_CONSOLE) 1225 if (!efi_enabled(EFI_BOOT) || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY)) 1226 conswitchp = &vga_con; 1227 #elif defined(CONFIG_DUMMY_CONSOLE) 1228 conswitchp = &dummy_con; 1229 #endif 1230 #endif 1231 x86_init.oem.banner(); 1232 1233 x86_init.timers.wallclock_init(); 1234 1235 mcheck_init(); 1236 1237 arch_init_ideal_nops(); 1238 1239 register_refined_jiffies(CLOCK_TICK_RATE); 1240 1241 #ifdef CONFIG_EFI 1242 if (efi_enabled(EFI_BOOT)) 1243 efi_apply_memmap_quirks(); 1244 #endif 1245 } 1246 1247 #ifdef CONFIG_X86_32 1248 1249 static struct resource video_ram_resource = { 1250 .name = "Video RAM area", 1251 .start = 0xa0000, 1252 .end = 0xbffff, 1253 .flags = IORESOURCE_BUSY | IORESOURCE_MEM 1254 }; 1255 1256 void __init i386_reserve_resources(void) 1257 { 1258 request_resource(&iomem_resource, &video_ram_resource); 1259 reserve_standard_io_resources(); 1260 } 1261 1262 #endif /* CONFIG_X86_32 */ 1263 1264 static struct notifier_block kernel_offset_notifier = { 1265 .notifier_call = dump_kernel_offset 1266 }; 1267 1268 static int __init register_kernel_offset_dumper(void) 1269 { 1270 atomic_notifier_chain_register(&panic_notifier_list, 1271 &kernel_offset_notifier); 1272 return 0; 1273 } 1274 __initcall(register_kernel_offset_dumper); 1275