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 #include <asm/kasan.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 = { 175 .wp_works_ok = -1, 176 }; 177 /* common cpu data for all cpus */ 178 struct cpuinfo_x86 boot_cpu_data __read_mostly = { 179 .wp_works_ok = -1, 180 }; 181 EXPORT_SYMBOL(boot_cpu_data); 182 183 unsigned int def_to_bigsmp; 184 185 /* for MCA, but anyone else can use it if they want */ 186 unsigned int machine_id; 187 unsigned int machine_submodel_id; 188 unsigned int BIOS_revision; 189 190 struct apm_info apm_info; 191 EXPORT_SYMBOL(apm_info); 192 193 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \ 194 defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE) 195 struct ist_info ist_info; 196 EXPORT_SYMBOL(ist_info); 197 #else 198 struct ist_info ist_info; 199 #endif 200 201 #else 202 struct cpuinfo_x86 boot_cpu_data __read_mostly = { 203 .x86_phys_bits = MAX_PHYSMEM_BITS, 204 }; 205 EXPORT_SYMBOL(boot_cpu_data); 206 #endif 207 208 209 #if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64) 210 __visible unsigned long mmu_cr4_features; 211 #else 212 __visible unsigned long mmu_cr4_features = X86_CR4_PAE; 213 #endif 214 215 /* Boot loader ID and version as integers, for the benefit of proc_dointvec */ 216 int bootloader_type, bootloader_version; 217 218 /* 219 * Setup options 220 */ 221 struct screen_info screen_info; 222 EXPORT_SYMBOL(screen_info); 223 struct edid_info edid_info; 224 EXPORT_SYMBOL_GPL(edid_info); 225 226 extern int root_mountflags; 227 228 unsigned long saved_video_mode; 229 230 #define RAMDISK_IMAGE_START_MASK 0x07FF 231 #define RAMDISK_PROMPT_FLAG 0x8000 232 #define RAMDISK_LOAD_FLAG 0x4000 233 234 static char __initdata command_line[COMMAND_LINE_SIZE]; 235 #ifdef CONFIG_CMDLINE_BOOL 236 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE; 237 #endif 238 239 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE) 240 struct edd edd; 241 #ifdef CONFIG_EDD_MODULE 242 EXPORT_SYMBOL(edd); 243 #endif 244 /** 245 * copy_edd() - Copy the BIOS EDD information 246 * from boot_params into a safe place. 247 * 248 */ 249 static inline void __init copy_edd(void) 250 { 251 memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer, 252 sizeof(edd.mbr_signature)); 253 memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info)); 254 edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries; 255 edd.edd_info_nr = boot_params.eddbuf_entries; 256 } 257 #else 258 static inline void __init copy_edd(void) 259 { 260 } 261 #endif 262 263 void * __init extend_brk(size_t size, size_t align) 264 { 265 size_t mask = align - 1; 266 void *ret; 267 268 BUG_ON(_brk_start == 0); 269 BUG_ON(align & mask); 270 271 _brk_end = (_brk_end + mask) & ~mask; 272 BUG_ON((char *)(_brk_end + size) > __brk_limit); 273 274 ret = (void *)_brk_end; 275 _brk_end += size; 276 277 memset(ret, 0, size); 278 279 return ret; 280 } 281 282 #ifdef CONFIG_X86_32 283 static void __init cleanup_highmap(void) 284 { 285 } 286 #endif 287 288 static void __init reserve_brk(void) 289 { 290 if (_brk_end > _brk_start) 291 memblock_reserve(__pa_symbol(_brk_start), 292 _brk_end - _brk_start); 293 294 /* Mark brk area as locked down and no longer taking any 295 new allocations */ 296 _brk_start = 0; 297 } 298 299 u64 relocated_ramdisk; 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 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); 326 327 /* We need to move the initrd down into directly mapped mem */ 328 relocated_ramdisk = memblock_find_in_range(0, PFN_PHYS(max_pfn_mapped), 329 area_size, PAGE_SIZE); 330 331 if (!relocated_ramdisk) 332 panic("Cannot find place for new RAMDISK of size %lld\n", 333 ramdisk_size); 334 335 /* Note: this includes all the mem currently occupied by 336 the initrd, we rely on that fact to keep the data intact. */ 337 memblock_reserve(relocated_ramdisk, area_size); 338 initrd_start = relocated_ramdisk + PAGE_OFFSET; 339 initrd_end = initrd_start + ramdisk_size; 340 printk(KERN_INFO "Allocated new RAMDISK: [mem %#010llx-%#010llx]\n", 341 relocated_ramdisk, relocated_ramdisk + ramdisk_size - 1); 342 343 copy_from_early_mem((void *)initrd_start, ramdisk_image, ramdisk_size); 344 345 printk(KERN_INFO "Move RAMDISK from [mem %#010llx-%#010llx] to" 346 " [mem %#010llx-%#010llx]\n", 347 ramdisk_image, ramdisk_image + ramdisk_size - 1, 348 relocated_ramdisk, relocated_ramdisk + ramdisk_size - 1); 349 } 350 351 static void __init early_reserve_initrd(void) 352 { 353 /* Assume only end is not page aligned */ 354 u64 ramdisk_image = get_ramdisk_image(); 355 u64 ramdisk_size = get_ramdisk_size(); 356 u64 ramdisk_end = PAGE_ALIGN(ramdisk_image + ramdisk_size); 357 358 if (!boot_params.hdr.type_of_loader || 359 !ramdisk_image || !ramdisk_size) 360 return; /* No initrd provided by bootloader */ 361 362 memblock_reserve(ramdisk_image, ramdisk_end - ramdisk_image); 363 } 364 static void __init reserve_initrd(void) 365 { 366 /* Assume only end is not page aligned */ 367 u64 ramdisk_image = get_ramdisk_image(); 368 u64 ramdisk_size = get_ramdisk_size(); 369 u64 ramdisk_end = PAGE_ALIGN(ramdisk_image + ramdisk_size); 370 u64 mapped_size; 371 372 if (!boot_params.hdr.type_of_loader || 373 !ramdisk_image || !ramdisk_size) 374 return; /* No initrd provided by bootloader */ 375 376 initrd_start = 0; 377 378 mapped_size = memblock_mem_size(max_pfn_mapped); 379 if (ramdisk_size >= (mapped_size>>1)) 380 panic("initrd too large to handle, " 381 "disabling initrd (%lld needed, %lld available)\n", 382 ramdisk_size, mapped_size>>1); 383 384 printk(KERN_INFO "RAMDISK: [mem %#010llx-%#010llx]\n", ramdisk_image, 385 ramdisk_end - 1); 386 387 if (pfn_range_is_mapped(PFN_DOWN(ramdisk_image), 388 PFN_DOWN(ramdisk_end))) { 389 /* All are mapped, easy case */ 390 initrd_start = ramdisk_image + PAGE_OFFSET; 391 initrd_end = initrd_start + ramdisk_size; 392 return; 393 } 394 395 relocate_initrd(); 396 397 memblock_free(ramdisk_image, ramdisk_end - ramdisk_image); 398 } 399 #else 400 static void __init early_reserve_initrd(void) 401 { 402 } 403 static void __init reserve_initrd(void) 404 { 405 } 406 #endif /* CONFIG_BLK_DEV_INITRD */ 407 408 static void __init parse_setup_data(void) 409 { 410 struct setup_data *data; 411 u64 pa_data, pa_next; 412 413 pa_data = boot_params.hdr.setup_data; 414 while (pa_data) { 415 u32 data_len, data_type; 416 417 data = early_memremap(pa_data, sizeof(*data)); 418 data_len = data->len + sizeof(struct setup_data); 419 data_type = data->type; 420 pa_next = data->next; 421 early_memunmap(data, sizeof(*data)); 422 423 switch (data_type) { 424 case SETUP_E820_EXT: 425 parse_e820_ext(pa_data, data_len); 426 break; 427 case SETUP_DTB: 428 add_dtb(pa_data); 429 break; 430 case SETUP_EFI: 431 parse_efi_setup(pa_data, data_len); 432 break; 433 default: 434 break; 435 } 436 pa_data = pa_next; 437 } 438 } 439 440 static void __init e820_reserve_setup_data(void) 441 { 442 struct setup_data *data; 443 u64 pa_data; 444 445 pa_data = boot_params.hdr.setup_data; 446 if (!pa_data) 447 return; 448 449 while (pa_data) { 450 data = early_memremap(pa_data, sizeof(*data)); 451 e820_update_range(pa_data, sizeof(*data)+data->len, 452 E820_RAM, E820_RESERVED_KERN); 453 pa_data = data->next; 454 early_memunmap(data, sizeof(*data)); 455 } 456 457 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); 458 memcpy(&e820_saved, &e820, sizeof(struct e820map)); 459 printk(KERN_INFO "extended physical RAM map:\n"); 460 e820_print_map("reserve setup_data"); 461 } 462 463 static void __init memblock_x86_reserve_range_setup_data(void) 464 { 465 struct setup_data *data; 466 u64 pa_data; 467 468 pa_data = boot_params.hdr.setup_data; 469 while (pa_data) { 470 data = early_memremap(pa_data, sizeof(*data)); 471 memblock_reserve(pa_data, sizeof(*data) + data->len); 472 pa_data = data->next; 473 early_memunmap(data, sizeof(*data)); 474 } 475 } 476 477 /* 478 * --------- Crashkernel reservation ------------------------------ 479 */ 480 481 #ifdef CONFIG_KEXEC_CORE 482 483 /* 484 * Keep the crash kernel below this limit. On 32 bits earlier kernels 485 * would limit the kernel to the low 512 MiB due to mapping restrictions. 486 * On 64bit, old kexec-tools need to under 896MiB. 487 */ 488 #ifdef CONFIG_X86_32 489 # define CRASH_KERNEL_ADDR_LOW_MAX (512 << 20) 490 # define CRASH_KERNEL_ADDR_HIGH_MAX (512 << 20) 491 #else 492 # define CRASH_KERNEL_ADDR_LOW_MAX (896UL<<20) 493 # define CRASH_KERNEL_ADDR_HIGH_MAX MAXMEM 494 #endif 495 496 static void __init reserve_crashkernel_low(void) 497 { 498 #ifdef CONFIG_X86_64 499 const unsigned long long alignment = 16<<20; /* 16M */ 500 unsigned long long low_base = 0, low_size = 0; 501 unsigned long total_low_mem; 502 unsigned long long base; 503 bool auto_set = false; 504 int ret; 505 506 total_low_mem = memblock_mem_size(1UL<<(32-PAGE_SHIFT)); 507 /* crashkernel=Y,low */ 508 ret = parse_crashkernel_low(boot_command_line, total_low_mem, 509 &low_size, &base); 510 if (ret != 0) { 511 /* 512 * two parts from lib/swiotlb.c: 513 * -swiotlb size: user-specified with swiotlb= or default. 514 * 515 * -swiotlb overflow buffer: now hardcoded to 32k. We round it 516 * to 8M for other buffers that may need to stay low too. Also 517 * make sure we allocate enough extra low memory so that we 518 * don't run out of DMA buffers for 32-bit devices. 519 */ 520 low_size = max(swiotlb_size_or_default() + (8UL<<20), 256UL<<20); 521 auto_set = true; 522 } else { 523 /* passed with crashkernel=0,low ? */ 524 if (!low_size) 525 return; 526 } 527 528 low_base = memblock_find_in_range(low_size, (1ULL<<32), 529 low_size, alignment); 530 531 if (!low_base) { 532 if (!auto_set) 533 pr_info("crashkernel low reservation failed - No suitable area found.\n"); 534 535 return; 536 } 537 538 memblock_reserve(low_base, low_size); 539 pr_info("Reserving %ldMB of low memory at %ldMB for crashkernel (System low RAM: %ldMB)\n", 540 (unsigned long)(low_size >> 20), 541 (unsigned long)(low_base >> 20), 542 (unsigned long)(total_low_mem >> 20)); 543 crashk_low_res.start = low_base; 544 crashk_low_res.end = low_base + low_size - 1; 545 insert_resource(&iomem_resource, &crashk_low_res); 546 #endif 547 } 548 549 static void __init reserve_crashkernel(void) 550 { 551 const unsigned long long alignment = 16<<20; /* 16M */ 552 unsigned long long total_mem; 553 unsigned long long crash_size, crash_base; 554 bool high = false; 555 int ret; 556 557 total_mem = memblock_phys_mem_size(); 558 559 /* crashkernel=XM */ 560 ret = parse_crashkernel(boot_command_line, total_mem, 561 &crash_size, &crash_base); 562 if (ret != 0 || crash_size <= 0) { 563 /* crashkernel=X,high */ 564 ret = parse_crashkernel_high(boot_command_line, total_mem, 565 &crash_size, &crash_base); 566 if (ret != 0 || crash_size <= 0) 567 return; 568 high = true; 569 } 570 571 /* 0 means: find the address automatically */ 572 if (crash_base <= 0) { 573 /* 574 * kexec want bzImage is below CRASH_KERNEL_ADDR_MAX 575 */ 576 crash_base = memblock_find_in_range(alignment, 577 high ? CRASH_KERNEL_ADDR_HIGH_MAX : 578 CRASH_KERNEL_ADDR_LOW_MAX, 579 crash_size, alignment); 580 581 if (!crash_base) { 582 pr_info("crashkernel reservation failed - No suitable area found.\n"); 583 return; 584 } 585 586 } else { 587 unsigned long long start; 588 589 start = memblock_find_in_range(crash_base, 590 crash_base + crash_size, crash_size, 1<<20); 591 if (start != crash_base) { 592 pr_info("crashkernel reservation failed - memory is in use.\n"); 593 return; 594 } 595 } 596 memblock_reserve(crash_base, crash_size); 597 598 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB " 599 "for crashkernel (System RAM: %ldMB)\n", 600 (unsigned long)(crash_size >> 20), 601 (unsigned long)(crash_base >> 20), 602 (unsigned long)(total_mem >> 20)); 603 604 crashk_res.start = crash_base; 605 crashk_res.end = crash_base + crash_size - 1; 606 insert_resource(&iomem_resource, &crashk_res); 607 608 if (crash_base >= (1ULL<<32)) 609 reserve_crashkernel_low(); 610 } 611 #else 612 static void __init reserve_crashkernel(void) 613 { 614 } 615 #endif 616 617 static struct resource standard_io_resources[] = { 618 { .name = "dma1", .start = 0x00, .end = 0x1f, 619 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 620 { .name = "pic1", .start = 0x20, .end = 0x21, 621 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 622 { .name = "timer0", .start = 0x40, .end = 0x43, 623 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 624 { .name = "timer1", .start = 0x50, .end = 0x53, 625 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 626 { .name = "keyboard", .start = 0x60, .end = 0x60, 627 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 628 { .name = "keyboard", .start = 0x64, .end = 0x64, 629 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 630 { .name = "dma page reg", .start = 0x80, .end = 0x8f, 631 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 632 { .name = "pic2", .start = 0xa0, .end = 0xa1, 633 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 634 { .name = "dma2", .start = 0xc0, .end = 0xdf, 635 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 636 { .name = "fpu", .start = 0xf0, .end = 0xff, 637 .flags = IORESOURCE_BUSY | IORESOURCE_IO } 638 }; 639 640 void __init reserve_standard_io_resources(void) 641 { 642 int i; 643 644 /* request I/O space for devices used on all i[345]86 PCs */ 645 for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++) 646 request_resource(&ioport_resource, &standard_io_resources[i]); 647 648 } 649 650 static __init void reserve_ibft_region(void) 651 { 652 unsigned long addr, size = 0; 653 654 addr = find_ibft_region(&size); 655 656 if (size) 657 memblock_reserve(addr, size); 658 } 659 660 static bool __init snb_gfx_workaround_needed(void) 661 { 662 #ifdef CONFIG_PCI 663 int i; 664 u16 vendor, devid; 665 static const __initconst u16 snb_ids[] = { 666 0x0102, 667 0x0112, 668 0x0122, 669 0x0106, 670 0x0116, 671 0x0126, 672 0x010a, 673 }; 674 675 /* Assume no if something weird is going on with PCI */ 676 if (!early_pci_allowed()) 677 return false; 678 679 vendor = read_pci_config_16(0, 2, 0, PCI_VENDOR_ID); 680 if (vendor != 0x8086) 681 return false; 682 683 devid = read_pci_config_16(0, 2, 0, PCI_DEVICE_ID); 684 for (i = 0; i < ARRAY_SIZE(snb_ids); i++) 685 if (devid == snb_ids[i]) 686 return true; 687 #endif 688 689 return false; 690 } 691 692 /* 693 * Sandy Bridge graphics has trouble with certain ranges, exclude 694 * them from allocation. 695 */ 696 static void __init trim_snb_memory(void) 697 { 698 static const __initconst unsigned long bad_pages[] = { 699 0x20050000, 700 0x20110000, 701 0x20130000, 702 0x20138000, 703 0x40004000, 704 }; 705 int i; 706 707 if (!snb_gfx_workaround_needed()) 708 return; 709 710 printk(KERN_DEBUG "reserving inaccessible SNB gfx pages\n"); 711 712 /* 713 * Reserve all memory below the 1 MB mark that has not 714 * already been reserved. 715 */ 716 memblock_reserve(0, 1<<20); 717 718 for (i = 0; i < ARRAY_SIZE(bad_pages); i++) { 719 if (memblock_reserve(bad_pages[i], PAGE_SIZE)) 720 printk(KERN_WARNING "failed to reserve 0x%08lx\n", 721 bad_pages[i]); 722 } 723 } 724 725 /* 726 * Here we put platform-specific memory range workarounds, i.e. 727 * memory known to be corrupt or otherwise in need to be reserved on 728 * specific platforms. 729 * 730 * If this gets used more widely it could use a real dispatch mechanism. 731 */ 732 static void __init trim_platform_memory_ranges(void) 733 { 734 trim_snb_memory(); 735 } 736 737 static void __init trim_bios_range(void) 738 { 739 /* 740 * A special case is the first 4Kb of memory; 741 * This is a BIOS owned area, not kernel ram, but generally 742 * not listed as such in the E820 table. 743 * 744 * This typically reserves additional memory (64KiB by default) 745 * since some BIOSes are known to corrupt low memory. See the 746 * Kconfig help text for X86_RESERVE_LOW. 747 */ 748 e820_update_range(0, PAGE_SIZE, E820_RAM, E820_RESERVED); 749 750 /* 751 * special case: Some BIOSen report the PC BIOS 752 * area (640->1Mb) as ram even though it is not. 753 * take them out. 754 */ 755 e820_remove_range(BIOS_BEGIN, BIOS_END - BIOS_BEGIN, E820_RAM, 1); 756 757 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); 758 } 759 760 /* called before trim_bios_range() to spare extra sanitize */ 761 static void __init e820_add_kernel_range(void) 762 { 763 u64 start = __pa_symbol(_text); 764 u64 size = __pa_symbol(_end) - start; 765 766 /* 767 * Complain if .text .data and .bss are not marked as E820_RAM and 768 * attempt to fix it by adding the range. We may have a confused BIOS, 769 * or the user may have used memmap=exactmap or memmap=xxM$yyM to 770 * exclude kernel range. If we really are running on top non-RAM, 771 * we will crash later anyways. 772 */ 773 if (e820_all_mapped(start, start + size, E820_RAM)) 774 return; 775 776 pr_warn(".text .data .bss are not marked as E820_RAM!\n"); 777 e820_remove_range(start, size, E820_RAM, 0); 778 e820_add_region(start, size, E820_RAM); 779 } 780 781 static unsigned reserve_low = CONFIG_X86_RESERVE_LOW << 10; 782 783 static int __init parse_reservelow(char *p) 784 { 785 unsigned long long size; 786 787 if (!p) 788 return -EINVAL; 789 790 size = memparse(p, &p); 791 792 if (size < 4096) 793 size = 4096; 794 795 if (size > 640*1024) 796 size = 640*1024; 797 798 reserve_low = size; 799 800 return 0; 801 } 802 803 early_param("reservelow", parse_reservelow); 804 805 static void __init trim_low_memory_range(void) 806 { 807 memblock_reserve(0, ALIGN(reserve_low, PAGE_SIZE)); 808 } 809 810 /* 811 * Dump out kernel offset information on panic. 812 */ 813 static int 814 dump_kernel_offset(struct notifier_block *self, unsigned long v, void *p) 815 { 816 if (kaslr_enabled()) { 817 pr_emerg("Kernel Offset: 0x%lx from 0x%lx (relocation range: 0x%lx-0x%lx)\n", 818 kaslr_offset(), 819 __START_KERNEL, 820 __START_KERNEL_map, 821 MODULES_VADDR-1); 822 } else { 823 pr_emerg("Kernel Offset: disabled\n"); 824 } 825 826 return 0; 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)); 857 858 /* 859 * copy kernel address range established so far and switch 860 * to the proper swapper page table 861 */ 862 clone_pgd_range(swapper_pg_dir + KERNEL_PGD_BOUNDARY, 863 initial_page_table + KERNEL_PGD_BOUNDARY, 864 KERNEL_PGD_PTRS); 865 866 load_cr3(swapper_pg_dir); 867 /* 868 * Note: Quark X1000 CPUs advertise PGE incorrectly and require 869 * a cr3 based tlb flush, so the following __flush_tlb_all() 870 * will not flush anything because the cpu quirk which clears 871 * X86_FEATURE_PGE has not been invoked yet. Though due to the 872 * load_cr3() above the TLB has been flushed already. The 873 * quirk is invoked before subsequent calls to __flush_tlb_all() 874 * so proper operation is guaranteed. 875 */ 876 __flush_tlb_all(); 877 #else 878 printk(KERN_INFO "Command line: %s\n", boot_command_line); 879 #endif 880 881 /* 882 * If we have OLPC OFW, we might end up relocating the fixmap due to 883 * reserve_top(), so do this before touching the ioremap area. 884 */ 885 olpc_ofw_detect(); 886 887 early_trap_init(); 888 early_cpu_init(); 889 early_ioremap_init(); 890 891 setup_olpc_ofw_pgd(); 892 893 ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev); 894 screen_info = boot_params.screen_info; 895 edid_info = boot_params.edid_info; 896 #ifdef CONFIG_X86_32 897 apm_info.bios = boot_params.apm_bios_info; 898 ist_info = boot_params.ist_info; 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 EFI32_LOADER_SIGNATURE, 4)) { 917 set_bit(EFI_BOOT, &efi.flags); 918 } else if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature, 919 EFI64_LOADER_SIGNATURE, 4)) { 920 set_bit(EFI_BOOT, &efi.flags); 921 set_bit(EFI_64BIT, &efi.flags); 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(); 933 934 copy_edd(); 935 936 if (!boot_params.hdr.root_flags) 937 root_mountflags &= ~MS_RDONLY; 938 init_mm.start_code = (unsigned long) _text; 939 init_mm.end_code = (unsigned long) _etext; 940 init_mm.end_data = (unsigned long) _edata; 941 init_mm.brk = _brk_end; 942 943 mpx_mm_init(&init_mm); 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 /* update the e820_saved too */ 997 e820_reserve_setup_data(); 998 finish_e820_parsing(); 999 1000 if (efi_enabled(EFI_BOOT)) 1001 efi_init(); 1002 1003 dmi_scan_machine(); 1004 dmi_memdev_walk(); 1005 dmi_set_dump_stack_arch_desc(); 1006 1007 /* 1008 * VMware detection requires dmi to be available, so this 1009 * needs to be done after dmi_scan_machine, for the BP. 1010 */ 1011 init_hypervisor_platform(); 1012 1013 x86_init.resources.probe_roms(); 1014 1015 /* after parse_early_param, so could debug it */ 1016 insert_resource(&iomem_resource, &code_resource); 1017 insert_resource(&iomem_resource, &data_resource); 1018 insert_resource(&iomem_resource, &bss_resource); 1019 1020 e820_add_kernel_range(); 1021 trim_bios_range(); 1022 #ifdef CONFIG_X86_32 1023 if (ppro_with_ram_bug()) { 1024 e820_update_range(0x70000000ULL, 0x40000ULL, E820_RAM, 1025 E820_RESERVED); 1026 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); 1027 printk(KERN_INFO "fixed physical RAM map:\n"); 1028 e820_print_map("bad_ppro"); 1029 } 1030 #else 1031 early_gart_iommu_check(); 1032 #endif 1033 1034 /* 1035 * partially used pages are not usable - thus 1036 * we are rounding upwards: 1037 */ 1038 max_pfn = e820_end_of_ram_pfn(); 1039 1040 /* update e820 for memory not covered by WB MTRRs */ 1041 mtrr_bp_init(); 1042 if (mtrr_trim_uncached_memory(max_pfn)) 1043 max_pfn = e820_end_of_ram_pfn(); 1044 1045 #ifdef CONFIG_X86_32 1046 /* max_low_pfn get updated here */ 1047 find_low_pfn_range(); 1048 #else 1049 check_x2apic(); 1050 1051 /* How many end-of-memory variables you have, grandma! */ 1052 /* need this before calling reserve_initrd */ 1053 if (max_pfn > (1UL<<(32 - PAGE_SHIFT))) 1054 max_low_pfn = e820_end_of_low_ram_pfn(); 1055 else 1056 max_low_pfn = max_pfn; 1057 1058 high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1; 1059 #endif 1060 1061 /* 1062 * Find and reserve possible boot-time SMP configuration: 1063 */ 1064 find_smp_config(); 1065 1066 reserve_ibft_region(); 1067 1068 early_alloc_pgt_buf(); 1069 1070 /* 1071 * Need to conclude brk, before memblock_x86_fill() 1072 * it could use memblock_find_in_range, could overlap with 1073 * brk area. 1074 */ 1075 reserve_brk(); 1076 1077 cleanup_highmap(); 1078 1079 memblock_set_current_limit(ISA_END_ADDRESS); 1080 memblock_x86_fill(); 1081 1082 if (efi_enabled(EFI_BOOT)) 1083 efi_find_mirror(); 1084 1085 /* 1086 * The EFI specification says that boot service code won't be called 1087 * after ExitBootServices(). This is, in fact, a lie. 1088 */ 1089 if (efi_enabled(EFI_MEMMAP)) 1090 efi_reserve_boot_services(); 1091 1092 /* preallocate 4k for mptable mpc */ 1093 early_reserve_e820_mpc_new(); 1094 1095 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION 1096 setup_bios_corruption_check(); 1097 #endif 1098 1099 #ifdef CONFIG_X86_32 1100 printk(KERN_DEBUG "initial memory mapped: [mem 0x00000000-%#010lx]\n", 1101 (max_pfn_mapped<<PAGE_SHIFT) - 1); 1102 #endif 1103 1104 reserve_real_mode(); 1105 1106 trim_platform_memory_ranges(); 1107 trim_low_memory_range(); 1108 1109 init_mem_mapping(); 1110 1111 early_trap_pf_init(); 1112 1113 setup_real_mode(); 1114 1115 memblock_set_current_limit(get_max_mapped()); 1116 1117 /* 1118 * NOTE: On x86-32, only from this point on, fixmaps are ready for use. 1119 */ 1120 1121 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT 1122 if (init_ohci1394_dma_early) 1123 init_ohci1394_dma_on_all_controllers(); 1124 #endif 1125 /* Allocate bigger log buffer */ 1126 setup_log_buf(1); 1127 1128 reserve_initrd(); 1129 1130 #if defined(CONFIG_ACPI) && defined(CONFIG_BLK_DEV_INITRD) 1131 acpi_initrd_override((void *)initrd_start, initrd_end - initrd_start); 1132 #endif 1133 1134 vsmp_init(); 1135 1136 io_delay_init(); 1137 1138 /* 1139 * Parse the ACPI tables for possible boot-time SMP configuration. 1140 */ 1141 acpi_boot_table_init(); 1142 1143 early_acpi_boot_init(); 1144 1145 initmem_init(); 1146 dma_contiguous_reserve(max_pfn_mapped << PAGE_SHIFT); 1147 1148 /* 1149 * Reserve memory for crash kernel after SRAT is parsed so that it 1150 * won't consume hotpluggable memory. 1151 */ 1152 reserve_crashkernel(); 1153 1154 memblock_find_dma_reserve(); 1155 1156 #ifdef CONFIG_KVM_GUEST 1157 kvmclock_init(); 1158 #endif 1159 1160 x86_init.paging.pagetable_init(); 1161 1162 kasan_init(); 1163 1164 if (boot_cpu_data.cpuid_level >= 0) { 1165 /* A CPU has %cr4 if and only if it has CPUID */ 1166 mmu_cr4_features = __read_cr4(); 1167 if (trampoline_cr4_features) 1168 *trampoline_cr4_features = mmu_cr4_features; 1169 } 1170 1171 #ifdef CONFIG_X86_32 1172 /* sync back kernel address range */ 1173 clone_pgd_range(initial_page_table + KERNEL_PGD_BOUNDARY, 1174 swapper_pg_dir + KERNEL_PGD_BOUNDARY, 1175 KERNEL_PGD_PTRS); 1176 1177 /* 1178 * sync back low identity map too. It is used for example 1179 * in the 32-bit EFI stub. 1180 */ 1181 clone_pgd_range(initial_page_table, 1182 swapper_pg_dir + KERNEL_PGD_BOUNDARY, 1183 KERNEL_PGD_PTRS); 1184 #endif 1185 1186 tboot_probe(); 1187 1188 map_vsyscall(); 1189 1190 generic_apic_probe(); 1191 1192 early_quirks(); 1193 1194 /* 1195 * Read APIC and some other early information from ACPI tables. 1196 */ 1197 acpi_boot_init(); 1198 sfi_init(); 1199 x86_dtb_init(); 1200 1201 /* 1202 * get boot-time SMP configuration: 1203 */ 1204 if (smp_found_config) 1205 get_smp_config(); 1206 1207 prefill_possible_map(); 1208 1209 init_cpu_to_node(); 1210 1211 init_apic_mappings(); 1212 io_apic_init_mappings(); 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