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