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/dmi.h> 86 #include <asm/io_apic.h> 87 #include <asm/ist.h> 88 #include <asm/setup_arch.h> 89 #include <asm/bios_ebda.h> 90 #include <asm/cacheflush.h> 91 #include <asm/processor.h> 92 #include <asm/bugs.h> 93 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/amd_nb.h> 111 #include <asm/mce.h> 112 #include <asm/alternative.h> 113 #include <asm/prom.h> 114 115 /* 116 * max_low_pfn_mapped: highest direct mapped pfn under 4GB 117 * max_pfn_mapped: highest direct mapped pfn over 4GB 118 * 119 * The direct mapping only covers E820_RAM regions, so the ranges and gaps are 120 * represented by pfn_mapped 121 */ 122 unsigned long max_low_pfn_mapped; 123 unsigned long max_pfn_mapped; 124 125 #ifdef CONFIG_DMI 126 RESERVE_BRK(dmi_alloc, 65536); 127 #endif 128 129 130 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 struct boot_params boot_params; 146 147 /* 148 * Machine setup.. 149 */ 150 static struct resource data_resource = { 151 .name = "Kernel data", 152 .start = 0, 153 .end = 0, 154 .flags = IORESOURCE_BUSY | IORESOURCE_MEM 155 }; 156 157 static struct resource code_resource = { 158 .name = "Kernel code", 159 .start = 0, 160 .end = 0, 161 .flags = IORESOURCE_BUSY | IORESOURCE_MEM 162 }; 163 164 static struct resource bss_resource = { 165 .name = "Kernel bss", 166 .start = 0, 167 .end = 0, 168 .flags = IORESOURCE_BUSY | IORESOURCE_MEM 169 }; 170 171 172 #ifdef CONFIG_X86_32 173 /* cpu data as detected by the assembly code in head.S */ 174 struct cpuinfo_x86 new_cpu_data __cpuinitdata = { 175 .wp_works_ok = -1, 176 .fdiv_bug = -1, 177 }; 178 /* common cpu data for all cpus */ 179 struct cpuinfo_x86 boot_cpu_data __read_mostly = { 180 .wp_works_ok = -1, 181 .fdiv_bug = -1, 182 }; 183 EXPORT_SYMBOL(boot_cpu_data); 184 185 unsigned int def_to_bigsmp; 186 187 /* for MCA, but anyone else can use it if they want */ 188 unsigned int machine_id; 189 unsigned int machine_submodel_id; 190 unsigned int BIOS_revision; 191 192 struct apm_info apm_info; 193 EXPORT_SYMBOL(apm_info); 194 195 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \ 196 defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE) 197 struct ist_info ist_info; 198 EXPORT_SYMBOL(ist_info); 199 #else 200 struct ist_info ist_info; 201 #endif 202 203 #else 204 struct cpuinfo_x86 boot_cpu_data __read_mostly = { 205 .x86_phys_bits = MAX_PHYSMEM_BITS, 206 }; 207 EXPORT_SYMBOL(boot_cpu_data); 208 #endif 209 210 211 #if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64) 212 unsigned long mmu_cr4_features; 213 #else 214 unsigned long mmu_cr4_features = X86_CR4_PAE; 215 #endif 216 217 /* Boot loader ID and version as integers, for the benefit of proc_dointvec */ 218 int bootloader_type, bootloader_version; 219 220 /* 221 * Setup options 222 */ 223 struct screen_info screen_info; 224 EXPORT_SYMBOL(screen_info); 225 struct edid_info edid_info; 226 EXPORT_SYMBOL_GPL(edid_info); 227 228 extern int root_mountflags; 229 230 unsigned long saved_video_mode; 231 232 #define RAMDISK_IMAGE_START_MASK 0x07FF 233 #define RAMDISK_PROMPT_FLAG 0x8000 234 #define RAMDISK_LOAD_FLAG 0x4000 235 236 static char __initdata command_line[COMMAND_LINE_SIZE]; 237 #ifdef CONFIG_CMDLINE_BOOL 238 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE; 239 #endif 240 241 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE) 242 struct edd edd; 243 #ifdef CONFIG_EDD_MODULE 244 EXPORT_SYMBOL(edd); 245 #endif 246 /** 247 * copy_edd() - Copy the BIOS EDD information 248 * from boot_params into a safe place. 249 * 250 */ 251 static inline void __init copy_edd(void) 252 { 253 memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer, 254 sizeof(edd.mbr_signature)); 255 memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info)); 256 edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries; 257 edd.edd_info_nr = boot_params.eddbuf_entries; 258 } 259 #else 260 static inline void __init copy_edd(void) 261 { 262 } 263 #endif 264 265 void * __init extend_brk(size_t size, size_t align) 266 { 267 size_t mask = align - 1; 268 void *ret; 269 270 BUG_ON(_brk_start == 0); 271 BUG_ON(align & mask); 272 273 _brk_end = (_brk_end + mask) & ~mask; 274 BUG_ON((char *)(_brk_end + size) > __brk_limit); 275 276 ret = (void *)_brk_end; 277 _brk_end += size; 278 279 memset(ret, 0, size); 280 281 return ret; 282 } 283 284 #ifdef CONFIG_X86_32 285 static void __init cleanup_highmap(void) 286 { 287 } 288 #endif 289 290 static void __init reserve_brk(void) 291 { 292 if (_brk_end > _brk_start) 293 memblock_reserve(__pa_symbol(_brk_start), 294 _brk_end - _brk_start); 295 296 /* Mark brk area as locked down and no longer taking any 297 new allocations */ 298 _brk_start = 0; 299 } 300 301 #ifdef CONFIG_BLK_DEV_INITRD 302 303 static u64 __init get_ramdisk_image(void) 304 { 305 u64 ramdisk_image = boot_params.hdr.ramdisk_image; 306 307 ramdisk_image |= (u64)boot_params.ext_ramdisk_image << 32; 308 309 return ramdisk_image; 310 } 311 static u64 __init get_ramdisk_size(void) 312 { 313 u64 ramdisk_size = boot_params.hdr.ramdisk_size; 314 315 ramdisk_size |= (u64)boot_params.ext_ramdisk_size << 32; 316 317 return ramdisk_size; 318 } 319 320 #define MAX_MAP_CHUNK (NR_FIX_BTMAPS << PAGE_SHIFT) 321 static void __init relocate_initrd(void) 322 { 323 /* Assume only end is not page aligned */ 324 u64 ramdisk_image = get_ramdisk_image(); 325 u64 ramdisk_size = get_ramdisk_size(); 326 u64 area_size = PAGE_ALIGN(ramdisk_size); 327 u64 ramdisk_here; 328 unsigned long slop, clen, mapaddr; 329 char *p, *q; 330 331 /* We need to move the initrd down into directly mapped mem */ 332 ramdisk_here = memblock_find_in_range(0, PFN_PHYS(max_pfn_mapped), 333 area_size, PAGE_SIZE); 334 335 if (!ramdisk_here) 336 panic("Cannot find place for new RAMDISK of size %lld\n", 337 ramdisk_size); 338 339 /* Note: this includes all the mem currently occupied by 340 the initrd, we rely on that fact to keep the data intact. */ 341 memblock_reserve(ramdisk_here, area_size); 342 initrd_start = ramdisk_here + PAGE_OFFSET; 343 initrd_end = initrd_start + ramdisk_size; 344 printk(KERN_INFO "Allocated new RAMDISK: [mem %#010llx-%#010llx]\n", 345 ramdisk_here, ramdisk_here + ramdisk_size - 1); 346 347 q = (char *)initrd_start; 348 349 /* Copy 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 } 363 364 ramdisk_image = get_ramdisk_image(); 365 ramdisk_size = get_ramdisk_size(); 366 printk(KERN_INFO "Move RAMDISK from [mem %#010llx-%#010llx] to" 367 " [mem %#010llx-%#010llx]\n", 368 ramdisk_image, ramdisk_image + ramdisk_size - 1, 369 ramdisk_here, ramdisk_here + ramdisk_size - 1); 370 } 371 372 static void __init early_reserve_initrd(void) 373 { 374 /* Assume only end is not page aligned */ 375 u64 ramdisk_image = get_ramdisk_image(); 376 u64 ramdisk_size = get_ramdisk_size(); 377 u64 ramdisk_end = PAGE_ALIGN(ramdisk_image + ramdisk_size); 378 379 if (!boot_params.hdr.type_of_loader || 380 !ramdisk_image || !ramdisk_size) 381 return; /* No initrd provided by bootloader */ 382 383 memblock_reserve(ramdisk_image, ramdisk_end - ramdisk_image); 384 } 385 static void __init reserve_initrd(void) 386 { 387 /* Assume only end is not page aligned */ 388 u64 ramdisk_image = get_ramdisk_image(); 389 u64 ramdisk_size = get_ramdisk_size(); 390 u64 ramdisk_end = PAGE_ALIGN(ramdisk_image + ramdisk_size); 391 u64 mapped_size; 392 393 if (!boot_params.hdr.type_of_loader || 394 !ramdisk_image || !ramdisk_size) 395 return; /* No initrd provided by bootloader */ 396 397 initrd_start = 0; 398 399 mapped_size = memblock_mem_size(max_pfn_mapped); 400 if (ramdisk_size >= (mapped_size>>1)) 401 panic("initrd too large to handle, " 402 "disabling initrd (%lld needed, %lld available)\n", 403 ramdisk_size, mapped_size>>1); 404 405 printk(KERN_INFO "RAMDISK: [mem %#010llx-%#010llx]\n", ramdisk_image, 406 ramdisk_end - 1); 407 408 if (pfn_range_is_mapped(PFN_DOWN(ramdisk_image), 409 PFN_DOWN(ramdisk_end))) { 410 /* All are mapped, easy case */ 411 initrd_start = ramdisk_image + PAGE_OFFSET; 412 initrd_end = initrd_start + ramdisk_size; 413 return; 414 } 415 416 relocate_initrd(); 417 418 memblock_free(ramdisk_image, ramdisk_end - ramdisk_image); 419 } 420 #else 421 static void __init early_reserve_initrd(void) 422 { 423 } 424 static void __init reserve_initrd(void) 425 { 426 } 427 #endif /* CONFIG_BLK_DEV_INITRD */ 428 429 static void __init parse_setup_data(void) 430 { 431 struct setup_data *data; 432 u64 pa_data; 433 434 pa_data = boot_params.hdr.setup_data; 435 while (pa_data) { 436 u32 data_len, map_len; 437 438 map_len = max(PAGE_SIZE - (pa_data & ~PAGE_MASK), 439 (u64)sizeof(struct setup_data)); 440 data = early_memremap(pa_data, map_len); 441 data_len = data->len + sizeof(struct setup_data); 442 if (data_len > map_len) { 443 early_iounmap(data, map_len); 444 data = early_memremap(pa_data, data_len); 445 map_len = data_len; 446 } 447 448 switch (data->type) { 449 case SETUP_E820_EXT: 450 parse_e820_ext(data); 451 break; 452 case SETUP_DTB: 453 add_dtb(pa_data); 454 break; 455 default: 456 break; 457 } 458 pa_data = data->next; 459 early_iounmap(data, map_len); 460 } 461 } 462 463 static void __init e820_reserve_setup_data(void) 464 { 465 struct setup_data *data; 466 u64 pa_data; 467 int found = 0; 468 469 pa_data = boot_params.hdr.setup_data; 470 while (pa_data) { 471 data = early_memremap(pa_data, sizeof(*data)); 472 e820_update_range(pa_data, sizeof(*data)+data->len, 473 E820_RAM, E820_RESERVED_KERN); 474 found = 1; 475 pa_data = data->next; 476 early_iounmap(data, sizeof(*data)); 477 } 478 if (!found) 479 return; 480 481 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); 482 memcpy(&e820_saved, &e820, sizeof(struct e820map)); 483 printk(KERN_INFO "extended physical RAM map:\n"); 484 e820_print_map("reserve setup_data"); 485 } 486 487 static void __init memblock_x86_reserve_range_setup_data(void) 488 { 489 struct setup_data *data; 490 u64 pa_data; 491 492 pa_data = boot_params.hdr.setup_data; 493 while (pa_data) { 494 data = early_memremap(pa_data, sizeof(*data)); 495 memblock_reserve(pa_data, sizeof(*data) + data->len); 496 pa_data = data->next; 497 early_iounmap(data, sizeof(*data)); 498 } 499 } 500 501 /* 502 * --------- Crashkernel reservation ------------------------------ 503 */ 504 505 #ifdef CONFIG_KEXEC 506 507 /* 508 * Keep the crash kernel below this limit. On 32 bits earlier kernels 509 * would limit the kernel to the low 512 MiB due to mapping restrictions. 510 * On 64bit, old kexec-tools need to under 896MiB. 511 */ 512 #ifdef CONFIG_X86_32 513 # define CRASH_KERNEL_ADDR_LOW_MAX (512 << 20) 514 # define CRASH_KERNEL_ADDR_HIGH_MAX (512 << 20) 515 #else 516 # define CRASH_KERNEL_ADDR_LOW_MAX (896UL<<20) 517 # define CRASH_KERNEL_ADDR_HIGH_MAX MAXMEM 518 #endif 519 520 static void __init reserve_crashkernel_low(void) 521 { 522 #ifdef CONFIG_X86_64 523 const unsigned long long alignment = 16<<20; /* 16M */ 524 unsigned long long low_base = 0, low_size = 0; 525 unsigned long total_low_mem; 526 unsigned long long base; 527 bool auto_set = false; 528 int ret; 529 530 total_low_mem = memblock_mem_size(1UL<<(32-PAGE_SHIFT)); 531 /* crashkernel=Y,low */ 532 ret = parse_crashkernel_low(boot_command_line, total_low_mem, 533 &low_size, &base); 534 if (ret != 0) { 535 /* 536 * two parts from lib/swiotlb.c: 537 * swiotlb size: user specified with swiotlb= or default. 538 * swiotlb overflow buffer: now is hardcoded to 32k. 539 * We round it to 8M for other buffers that 540 * may need to stay low too. 541 */ 542 low_size = swiotlb_size_or_default() + (8UL<<20); 543 auto_set = true; 544 } else { 545 /* passed with crashkernel=0,low ? */ 546 if (!low_size) 547 return; 548 } 549 550 low_base = memblock_find_in_range(low_size, (1ULL<<32), 551 low_size, alignment); 552 553 if (!low_base) { 554 if (!auto_set) 555 pr_info("crashkernel low reservation failed - No suitable area found.\n"); 556 557 return; 558 } 559 560 memblock_reserve(low_base, low_size); 561 pr_info("Reserving %ldMB of low memory at %ldMB for crashkernel (System low RAM: %ldMB)\n", 562 (unsigned long)(low_size >> 20), 563 (unsigned long)(low_base >> 20), 564 (unsigned long)(total_low_mem >> 20)); 565 crashk_low_res.start = low_base; 566 crashk_low_res.end = low_base + low_size - 1; 567 insert_resource(&iomem_resource, &crashk_low_res); 568 #endif 569 } 570 571 static void __init reserve_crashkernel(void) 572 { 573 const unsigned long long alignment = 16<<20; /* 16M */ 574 unsigned long long total_mem; 575 unsigned long long crash_size, crash_base; 576 bool high = false; 577 int ret; 578 579 total_mem = memblock_phys_mem_size(); 580 581 /* crashkernel=XM */ 582 ret = parse_crashkernel(boot_command_line, total_mem, 583 &crash_size, &crash_base); 584 if (ret != 0 || crash_size <= 0) { 585 /* crashkernel=X,high */ 586 ret = parse_crashkernel_high(boot_command_line, total_mem, 587 &crash_size, &crash_base); 588 if (ret != 0 || crash_size <= 0) 589 return; 590 high = true; 591 } 592 593 /* 0 means: find the address automatically */ 594 if (crash_base <= 0) { 595 /* 596 * kexec want bzImage is below CRASH_KERNEL_ADDR_MAX 597 */ 598 crash_base = memblock_find_in_range(alignment, 599 high ? CRASH_KERNEL_ADDR_HIGH_MAX : 600 CRASH_KERNEL_ADDR_LOW_MAX, 601 crash_size, alignment); 602 603 if (!crash_base) { 604 pr_info("crashkernel reservation failed - No suitable area found.\n"); 605 return; 606 } 607 608 } else { 609 unsigned long long start; 610 611 start = memblock_find_in_range(crash_base, 612 crash_base + crash_size, crash_size, 1<<20); 613 if (start != crash_base) { 614 pr_info("crashkernel reservation failed - memory is in use.\n"); 615 return; 616 } 617 } 618 memblock_reserve(crash_base, crash_size); 619 620 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB " 621 "for crashkernel (System RAM: %ldMB)\n", 622 (unsigned long)(crash_size >> 20), 623 (unsigned long)(crash_base >> 20), 624 (unsigned long)(total_mem >> 20)); 625 626 crashk_res.start = crash_base; 627 crashk_res.end = crash_base + crash_size - 1; 628 insert_resource(&iomem_resource, &crashk_res); 629 630 if (crash_base >= (1ULL<<32)) 631 reserve_crashkernel_low(); 632 } 633 #else 634 static void __init reserve_crashkernel(void) 635 { 636 } 637 #endif 638 639 static struct resource standard_io_resources[] = { 640 { .name = "dma1", .start = 0x00, .end = 0x1f, 641 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 642 { .name = "pic1", .start = 0x20, .end = 0x21, 643 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 644 { .name = "timer0", .start = 0x40, .end = 0x43, 645 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 646 { .name = "timer1", .start = 0x50, .end = 0x53, 647 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 648 { .name = "keyboard", .start = 0x60, .end = 0x60, 649 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 650 { .name = "keyboard", .start = 0x64, .end = 0x64, 651 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 652 { .name = "dma page reg", .start = 0x80, .end = 0x8f, 653 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 654 { .name = "pic2", .start = 0xa0, .end = 0xa1, 655 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 656 { .name = "dma2", .start = 0xc0, .end = 0xdf, 657 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 658 { .name = "fpu", .start = 0xf0, .end = 0xff, 659 .flags = IORESOURCE_BUSY | IORESOURCE_IO } 660 }; 661 662 void __init reserve_standard_io_resources(void) 663 { 664 int i; 665 666 /* request I/O space for devices used on all i[345]86 PCs */ 667 for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++) 668 request_resource(&ioport_resource, &standard_io_resources[i]); 669 670 } 671 672 static __init void reserve_ibft_region(void) 673 { 674 unsigned long addr, size = 0; 675 676 addr = find_ibft_region(&size); 677 678 if (size) 679 memblock_reserve(addr, size); 680 } 681 682 static bool __init snb_gfx_workaround_needed(void) 683 { 684 #ifdef CONFIG_PCI 685 int i; 686 u16 vendor, devid; 687 static const __initconst u16 snb_ids[] = { 688 0x0102, 689 0x0112, 690 0x0122, 691 0x0106, 692 0x0116, 693 0x0126, 694 0x010a, 695 }; 696 697 /* Assume no if something weird is going on with PCI */ 698 if (!early_pci_allowed()) 699 return false; 700 701 vendor = read_pci_config_16(0, 2, 0, PCI_VENDOR_ID); 702 if (vendor != 0x8086) 703 return false; 704 705 devid = read_pci_config_16(0, 2, 0, PCI_DEVICE_ID); 706 for (i = 0; i < ARRAY_SIZE(snb_ids); i++) 707 if (devid == snb_ids[i]) 708 return true; 709 #endif 710 711 return false; 712 } 713 714 /* 715 * Sandy Bridge graphics has trouble with certain ranges, exclude 716 * them from allocation. 717 */ 718 static void __init trim_snb_memory(void) 719 { 720 static const __initconst unsigned long bad_pages[] = { 721 0x20050000, 722 0x20110000, 723 0x20130000, 724 0x20138000, 725 0x40004000, 726 }; 727 int i; 728 729 if (!snb_gfx_workaround_needed()) 730 return; 731 732 printk(KERN_DEBUG "reserving inaccessible SNB gfx pages\n"); 733 734 /* 735 * Reserve all memory below the 1 MB mark that has not 736 * already been reserved. 737 */ 738 memblock_reserve(0, 1<<20); 739 740 for (i = 0; i < ARRAY_SIZE(bad_pages); i++) { 741 if (memblock_reserve(bad_pages[i], PAGE_SIZE)) 742 printk(KERN_WARNING "failed to reserve 0x%08lx\n", 743 bad_pages[i]); 744 } 745 } 746 747 /* 748 * Here we put platform-specific memory range workarounds, i.e. 749 * memory known to be corrupt or otherwise in need to be reserved on 750 * specific platforms. 751 * 752 * If this gets used more widely it could use a real dispatch mechanism. 753 */ 754 static void __init trim_platform_memory_ranges(void) 755 { 756 trim_snb_memory(); 757 } 758 759 static void __init trim_bios_range(void) 760 { 761 /* 762 * A special case is the first 4Kb of memory; 763 * This is a BIOS owned area, not kernel ram, but generally 764 * not listed as such in the E820 table. 765 * 766 * This typically reserves additional memory (64KiB by default) 767 * since some BIOSes are known to corrupt low memory. See the 768 * Kconfig help text for X86_RESERVE_LOW. 769 */ 770 e820_update_range(0, PAGE_SIZE, E820_RAM, E820_RESERVED); 771 772 /* 773 * special case: Some BIOSen report the PC BIOS 774 * area (640->1Mb) as ram even though it is not. 775 * take them out. 776 */ 777 e820_remove_range(BIOS_BEGIN, BIOS_END - BIOS_BEGIN, E820_RAM, 1); 778 779 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); 780 } 781 782 /* called before trim_bios_range() to spare extra sanitize */ 783 static void __init e820_add_kernel_range(void) 784 { 785 u64 start = __pa_symbol(_text); 786 u64 size = __pa_symbol(_end) - start; 787 788 /* 789 * Complain if .text .data and .bss are not marked as E820_RAM and 790 * attempt to fix it by adding the range. We may have a confused BIOS, 791 * or the user may have used memmap=exactmap or memmap=xxM$yyM to 792 * exclude kernel range. If we really are running on top non-RAM, 793 * we will crash later anyways. 794 */ 795 if (e820_all_mapped(start, start + size, E820_RAM)) 796 return; 797 798 pr_warn(".text .data .bss are not marked as E820_RAM!\n"); 799 e820_remove_range(start, size, E820_RAM, 0); 800 e820_add_region(start, size, E820_RAM); 801 } 802 803 static unsigned reserve_low = CONFIG_X86_RESERVE_LOW << 10; 804 805 static int __init parse_reservelow(char *p) 806 { 807 unsigned long long size; 808 809 if (!p) 810 return -EINVAL; 811 812 size = memparse(p, &p); 813 814 if (size < 4096) 815 size = 4096; 816 817 if (size > 640*1024) 818 size = 640*1024; 819 820 reserve_low = size; 821 822 return 0; 823 } 824 825 early_param("reservelow", parse_reservelow); 826 827 static void __init trim_low_memory_range(void) 828 { 829 memblock_reserve(0, ALIGN(reserve_low, PAGE_SIZE)); 830 } 831 832 /* 833 * Determine if we were loaded by an EFI loader. If so, then we have also been 834 * passed the efi memmap, systab, etc., so we should use these data structures 835 * for initialization. Note, the efi init code path is determined by the 836 * global efi_enabled. This allows the same kernel image to be used on existing 837 * systems (with a traditional BIOS) as well as on EFI systems. 838 */ 839 /* 840 * setup_arch - architecture-specific boot-time initializations 841 * 842 * Note: On x86_64, fixmaps are ready for use even before this is called. 843 */ 844 845 void __init setup_arch(char **cmdline_p) 846 { 847 memblock_reserve(__pa_symbol(_text), 848 (unsigned long)__bss_stop - (unsigned long)_text); 849 850 early_reserve_initrd(); 851 852 /* 853 * At this point everything still needed from the boot loader 854 * or BIOS or kernel text should be early reserved or marked not 855 * RAM in e820. All other memory is free game. 856 */ 857 858 #ifdef CONFIG_X86_32 859 memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data)); 860 visws_early_detect(); 861 862 /* 863 * copy kernel address range established so far and switch 864 * to the proper swapper page table 865 */ 866 clone_pgd_range(swapper_pg_dir + KERNEL_PGD_BOUNDARY, 867 initial_page_table + KERNEL_PGD_BOUNDARY, 868 KERNEL_PGD_PTRS); 869 870 load_cr3(swapper_pg_dir); 871 __flush_tlb_all(); 872 #else 873 printk(KERN_INFO "Command line: %s\n", boot_command_line); 874 #endif 875 876 /* 877 * If we have OLPC OFW, we might end up relocating the fixmap due to 878 * reserve_top(), so do this before touching the ioremap area. 879 */ 880 olpc_ofw_detect(); 881 882 early_trap_init(); 883 early_cpu_init(); 884 early_ioremap_init(); 885 886 setup_olpc_ofw_pgd(); 887 888 ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev); 889 screen_info = boot_params.screen_info; 890 edid_info = boot_params.edid_info; 891 #ifdef CONFIG_X86_32 892 apm_info.bios = boot_params.apm_bios_info; 893 ist_info = boot_params.ist_info; 894 if (boot_params.sys_desc_table.length != 0) { 895 machine_id = boot_params.sys_desc_table.table[0]; 896 machine_submodel_id = boot_params.sys_desc_table.table[1]; 897 BIOS_revision = boot_params.sys_desc_table.table[2]; 898 } 899 #endif 900 saved_video_mode = boot_params.hdr.vid_mode; 901 bootloader_type = boot_params.hdr.type_of_loader; 902 if ((bootloader_type >> 4) == 0xe) { 903 bootloader_type &= 0xf; 904 bootloader_type |= (boot_params.hdr.ext_loader_type+0x10) << 4; 905 } 906 bootloader_version = bootloader_type & 0xf; 907 bootloader_version |= boot_params.hdr.ext_loader_ver << 4; 908 909 #ifdef CONFIG_BLK_DEV_RAM 910 rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK; 911 rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0); 912 rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0); 913 #endif 914 #ifdef CONFIG_EFI 915 if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature, 916 "EL32", 4)) { 917 set_bit(EFI_BOOT, &x86_efi_facility); 918 } else if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature, 919 "EL64", 4)) { 920 set_bit(EFI_BOOT, &x86_efi_facility); 921 set_bit(EFI_64BIT, &x86_efi_facility); 922 } 923 924 if (efi_enabled(EFI_BOOT)) 925 efi_memblock_x86_reserve_range(); 926 #endif 927 928 x86_init.oem.arch_setup(); 929 930 iomem_resource.end = (1ULL << boot_cpu_data.x86_phys_bits) - 1; 931 setup_memory_map(); 932 parse_setup_data(); 933 /* update the e820_saved too */ 934 e820_reserve_setup_data(); 935 936 copy_edd(); 937 938 if (!boot_params.hdr.root_flags) 939 root_mountflags &= ~MS_RDONLY; 940 init_mm.start_code = (unsigned long) _text; 941 init_mm.end_code = (unsigned long) _etext; 942 init_mm.end_data = (unsigned long) _edata; 943 init_mm.brk = _brk_end; 944 945 code_resource.start = __pa_symbol(_text); 946 code_resource.end = __pa_symbol(_etext)-1; 947 data_resource.start = __pa_symbol(_etext); 948 data_resource.end = __pa_symbol(_edata)-1; 949 bss_resource.start = __pa_symbol(__bss_start); 950 bss_resource.end = __pa_symbol(__bss_stop)-1; 951 952 #ifdef CONFIG_CMDLINE_BOOL 953 #ifdef CONFIG_CMDLINE_OVERRIDE 954 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE); 955 #else 956 if (builtin_cmdline[0]) { 957 /* append boot loader cmdline to builtin */ 958 strlcat(builtin_cmdline, " ", COMMAND_LINE_SIZE); 959 strlcat(builtin_cmdline, boot_command_line, COMMAND_LINE_SIZE); 960 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE); 961 } 962 #endif 963 #endif 964 965 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE); 966 *cmdline_p = command_line; 967 968 /* 969 * x86_configure_nx() is called before parse_early_param() to detect 970 * whether hardware doesn't support NX (so that the early EHCI debug 971 * console setup can safely call set_fixmap()). It may then be called 972 * again from within noexec_setup() during parsing early parameters 973 * to honor the respective command line option. 974 */ 975 x86_configure_nx(); 976 977 parse_early_param(); 978 979 x86_report_nx(); 980 981 /* after early param, so could get panic from serial */ 982 memblock_x86_reserve_range_setup_data(); 983 984 if (acpi_mps_check()) { 985 #ifdef CONFIG_X86_LOCAL_APIC 986 disable_apic = 1; 987 #endif 988 setup_clear_cpu_cap(X86_FEATURE_APIC); 989 } 990 991 #ifdef CONFIG_PCI 992 if (pci_early_dump_regs) 993 early_dump_pci_devices(); 994 #endif 995 996 finish_e820_parsing(); 997 998 if (efi_enabled(EFI_BOOT)) 999 efi_init(); 1000 1001 dmi_scan_machine(); 1002 1003 /* 1004 * VMware detection requires dmi to be available, so this 1005 * needs to be done after dmi_scan_machine, for the BP. 1006 */ 1007 init_hypervisor_platform(); 1008 1009 x86_init.resources.probe_roms(); 1010 1011 /* after parse_early_param, so could debug it */ 1012 insert_resource(&iomem_resource, &code_resource); 1013 insert_resource(&iomem_resource, &data_resource); 1014 insert_resource(&iomem_resource, &bss_resource); 1015 1016 e820_add_kernel_range(); 1017 trim_bios_range(); 1018 #ifdef CONFIG_X86_32 1019 if (ppro_with_ram_bug()) { 1020 e820_update_range(0x70000000ULL, 0x40000ULL, E820_RAM, 1021 E820_RESERVED); 1022 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); 1023 printk(KERN_INFO "fixed physical RAM map:\n"); 1024 e820_print_map("bad_ppro"); 1025 } 1026 #else 1027 early_gart_iommu_check(); 1028 #endif 1029 1030 /* 1031 * partially used pages are not usable - thus 1032 * we are rounding upwards: 1033 */ 1034 max_pfn = e820_end_of_ram_pfn(); 1035 1036 /* update e820 for memory not covered by WB MTRRs */ 1037 mtrr_bp_init(); 1038 if (mtrr_trim_uncached_memory(max_pfn)) 1039 max_pfn = e820_end_of_ram_pfn(); 1040 1041 #ifdef CONFIG_X86_32 1042 /* max_low_pfn get updated here */ 1043 find_low_pfn_range(); 1044 #else 1045 num_physpages = max_pfn; 1046 1047 check_x2apic(); 1048 1049 /* How many end-of-memory variables you have, grandma! */ 1050 /* need this before calling reserve_initrd */ 1051 if (max_pfn > (1UL<<(32 - PAGE_SHIFT))) 1052 max_low_pfn = e820_end_of_low_ram_pfn(); 1053 else 1054 max_low_pfn = max_pfn; 1055 1056 high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1; 1057 #endif 1058 1059 /* 1060 * Find and reserve possible boot-time SMP configuration: 1061 */ 1062 find_smp_config(); 1063 1064 reserve_ibft_region(); 1065 1066 early_alloc_pgt_buf(); 1067 1068 /* 1069 * Need to conclude brk, before memblock_x86_fill() 1070 * it could use memblock_find_in_range, could overlap with 1071 * brk area. 1072 */ 1073 reserve_brk(); 1074 1075 cleanup_highmap(); 1076 1077 memblock.current_limit = ISA_END_ADDRESS; 1078 memblock_x86_fill(); 1079 1080 /* 1081 * The EFI specification says that boot service code won't be called 1082 * after ExitBootServices(). This is, in fact, a lie. 1083 */ 1084 if (efi_enabled(EFI_MEMMAP)) 1085 efi_reserve_boot_services(); 1086 1087 /* preallocate 4k for mptable mpc */ 1088 early_reserve_e820_mpc_new(); 1089 1090 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION 1091 setup_bios_corruption_check(); 1092 #endif 1093 1094 #ifdef CONFIG_X86_32 1095 printk(KERN_DEBUG "initial memory mapped: [mem 0x00000000-%#010lx]\n", 1096 (max_pfn_mapped<<PAGE_SHIFT) - 1); 1097 #endif 1098 1099 reserve_real_mode(); 1100 1101 trim_platform_memory_ranges(); 1102 trim_low_memory_range(); 1103 1104 init_mem_mapping(); 1105 1106 early_trap_pf_init(); 1107 1108 setup_real_mode(); 1109 1110 memblock.current_limit = get_max_mapped(); 1111 dma_contiguous_reserve(0); 1112 1113 /* 1114 * NOTE: On x86-32, only from this point on, fixmaps are ready for use. 1115 */ 1116 1117 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT 1118 if (init_ohci1394_dma_early) 1119 init_ohci1394_dma_on_all_controllers(); 1120 #endif 1121 /* Allocate bigger log buffer */ 1122 setup_log_buf(1); 1123 1124 reserve_initrd(); 1125 1126 #if defined(CONFIG_ACPI) && defined(CONFIG_BLK_DEV_INITRD) 1127 acpi_initrd_override((void *)initrd_start, initrd_end - initrd_start); 1128 #endif 1129 1130 reserve_crashkernel(); 1131 1132 vsmp_init(); 1133 1134 io_delay_init(); 1135 1136 /* 1137 * Parse the ACPI tables for possible boot-time SMP configuration. 1138 */ 1139 acpi_boot_table_init(); 1140 1141 early_acpi_boot_init(); 1142 1143 initmem_init(); 1144 memblock_find_dma_reserve(); 1145 1146 #ifdef CONFIG_KVM_GUEST 1147 kvmclock_init(); 1148 #endif 1149 1150 x86_init.paging.pagetable_init(); 1151 1152 if (boot_cpu_data.cpuid_level >= 0) { 1153 /* A CPU has %cr4 if and only if it has CPUID */ 1154 mmu_cr4_features = read_cr4(); 1155 if (trampoline_cr4_features) 1156 *trampoline_cr4_features = mmu_cr4_features; 1157 } 1158 1159 #ifdef CONFIG_X86_32 1160 /* sync back kernel address range */ 1161 clone_pgd_range(initial_page_table + KERNEL_PGD_BOUNDARY, 1162 swapper_pg_dir + KERNEL_PGD_BOUNDARY, 1163 KERNEL_PGD_PTRS); 1164 #endif 1165 1166 tboot_probe(); 1167 1168 #ifdef CONFIG_X86_64 1169 map_vsyscall(); 1170 #endif 1171 1172 generic_apic_probe(); 1173 1174 early_quirks(); 1175 1176 /* 1177 * Read APIC and some other early information from ACPI tables. 1178 */ 1179 acpi_boot_init(); 1180 sfi_init(); 1181 x86_dtb_init(); 1182 1183 /* 1184 * get boot-time SMP configuration: 1185 */ 1186 if (smp_found_config) 1187 get_smp_config(); 1188 1189 prefill_possible_map(); 1190 1191 init_cpu_to_node(); 1192 1193 init_apic_mappings(); 1194 if (x86_io_apic_ops.init) 1195 x86_io_apic_ops.init(); 1196 1197 kvm_guest_init(); 1198 1199 e820_reserve_resources(); 1200 e820_mark_nosave_regions(max_low_pfn); 1201 1202 x86_init.resources.reserve_resources(); 1203 1204 e820_setup_gap(); 1205 1206 #ifdef CONFIG_VT 1207 #if defined(CONFIG_VGA_CONSOLE) 1208 if (!efi_enabled(EFI_BOOT) || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY)) 1209 conswitchp = &vga_con; 1210 #elif defined(CONFIG_DUMMY_CONSOLE) 1211 conswitchp = &dummy_con; 1212 #endif 1213 #endif 1214 x86_init.oem.banner(); 1215 1216 x86_init.timers.wallclock_init(); 1217 1218 mcheck_init(); 1219 1220 arch_init_ideal_nops(); 1221 1222 register_refined_jiffies(CLOCK_TICK_RATE); 1223 1224 #ifdef CONFIG_EFI 1225 /* Once setup is done above, unmap the EFI memory map on 1226 * mismatched firmware/kernel archtectures since there is no 1227 * support for runtime services. 1228 */ 1229 if (efi_enabled(EFI_BOOT) && !efi_is_native()) { 1230 pr_info("efi: Setup done, disabling due to 32/64-bit mismatch\n"); 1231 efi_unmap_memmap(); 1232 } 1233 #endif 1234 } 1235 1236 #ifdef CONFIG_X86_32 1237 1238 static struct resource video_ram_resource = { 1239 .name = "Video RAM area", 1240 .start = 0xa0000, 1241 .end = 0xbffff, 1242 .flags = IORESOURCE_BUSY | IORESOURCE_MEM 1243 }; 1244 1245 void __init i386_reserve_resources(void) 1246 { 1247 request_resource(&iomem_resource, &video_ram_resource); 1248 reserve_standard_io_resources(); 1249 } 1250 1251 #endif /* CONFIG_X86_32 */ 1252