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 #include <asm/microcode.h> 115 #include <asm/mmu_context.h> 116 #include <asm/kaslr.h> 117 118 /* 119 * max_low_pfn_mapped: highest direct mapped pfn under 4GB 120 * max_pfn_mapped: highest direct mapped pfn over 4GB 121 * 122 * The direct mapping only covers E820_RAM regions, so the ranges and gaps are 123 * represented by pfn_mapped 124 */ 125 unsigned long max_low_pfn_mapped; 126 unsigned long max_pfn_mapped; 127 128 #ifdef CONFIG_DMI 129 RESERVE_BRK(dmi_alloc, 65536); 130 #endif 131 132 133 static __initdata unsigned long _brk_start = (unsigned long)__brk_base; 134 unsigned long _brk_end = (unsigned long)__brk_base; 135 136 #ifdef CONFIG_X86_64 137 int default_cpu_present_to_apicid(int mps_cpu) 138 { 139 return __default_cpu_present_to_apicid(mps_cpu); 140 } 141 142 int default_check_phys_apicid_present(int phys_apicid) 143 { 144 return __default_check_phys_apicid_present(phys_apicid); 145 } 146 #endif 147 148 struct boot_params boot_params; 149 150 /* 151 * Machine setup.. 152 */ 153 static struct resource data_resource = { 154 .name = "Kernel data", 155 .start = 0, 156 .end = 0, 157 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM 158 }; 159 160 static struct resource code_resource = { 161 .name = "Kernel code", 162 .start = 0, 163 .end = 0, 164 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM 165 }; 166 167 static struct resource bss_resource = { 168 .name = "Kernel bss", 169 .start = 0, 170 .end = 0, 171 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM 172 }; 173 174 175 #ifdef CONFIG_X86_32 176 /* cpu data as detected by the assembly code in head.S */ 177 struct cpuinfo_x86 new_cpu_data = { 178 .wp_works_ok = -1, 179 }; 180 /* common cpu data for all cpus */ 181 struct cpuinfo_x86 boot_cpu_data __read_mostly = { 182 .wp_works_ok = -1, 183 }; 184 EXPORT_SYMBOL(boot_cpu_data); 185 186 unsigned int def_to_bigsmp; 187 188 /* for MCA, but anyone else can use it if they want */ 189 unsigned int machine_id; 190 unsigned int machine_submodel_id; 191 unsigned int BIOS_revision; 192 193 struct apm_info apm_info; 194 EXPORT_SYMBOL(apm_info); 195 196 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \ 197 defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE) 198 struct ist_info ist_info; 199 EXPORT_SYMBOL(ist_info); 200 #else 201 struct ist_info ist_info; 202 #endif 203 204 #else 205 struct cpuinfo_x86 boot_cpu_data __read_mostly = { 206 .x86_phys_bits = MAX_PHYSMEM_BITS, 207 }; 208 EXPORT_SYMBOL(boot_cpu_data); 209 #endif 210 211 212 #if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64) 213 __visible unsigned long mmu_cr4_features; 214 #else 215 __visible unsigned long mmu_cr4_features = X86_CR4_PAE; 216 #endif 217 218 /* Boot loader ID and version as integers, for the benefit of proc_dointvec */ 219 int bootloader_type, bootloader_version; 220 221 /* 222 * Setup options 223 */ 224 struct screen_info screen_info; 225 EXPORT_SYMBOL(screen_info); 226 struct edid_info edid_info; 227 EXPORT_SYMBOL_GPL(edid_info); 228 229 extern int root_mountflags; 230 231 unsigned long saved_video_mode; 232 233 #define RAMDISK_IMAGE_START_MASK 0x07FF 234 #define RAMDISK_PROMPT_FLAG 0x8000 235 #define RAMDISK_LOAD_FLAG 0x4000 236 237 static char __initdata command_line[COMMAND_LINE_SIZE]; 238 #ifdef CONFIG_CMDLINE_BOOL 239 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE; 240 #endif 241 242 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE) 243 struct edd edd; 244 #ifdef CONFIG_EDD_MODULE 245 EXPORT_SYMBOL(edd); 246 #endif 247 /** 248 * copy_edd() - Copy the BIOS EDD information 249 * from boot_params into a safe place. 250 * 251 */ 252 static inline void __init copy_edd(void) 253 { 254 memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer, 255 sizeof(edd.mbr_signature)); 256 memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info)); 257 edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries; 258 edd.edd_info_nr = boot_params.eddbuf_entries; 259 } 260 #else 261 static inline void __init copy_edd(void) 262 { 263 } 264 #endif 265 266 void * __init extend_brk(size_t size, size_t align) 267 { 268 size_t mask = align - 1; 269 void *ret; 270 271 BUG_ON(_brk_start == 0); 272 BUG_ON(align & mask); 273 274 _brk_end = (_brk_end + mask) & ~mask; 275 BUG_ON((char *)(_brk_end + size) > __brk_limit); 276 277 ret = (void *)_brk_end; 278 _brk_end += size; 279 280 memset(ret, 0, size); 281 282 return ret; 283 } 284 285 #ifdef CONFIG_X86_32 286 static void __init cleanup_highmap(void) 287 { 288 } 289 #endif 290 291 static void __init reserve_brk(void) 292 { 293 if (_brk_end > _brk_start) 294 memblock_reserve(__pa_symbol(_brk_start), 295 _brk_end - _brk_start); 296 297 /* Mark brk area as locked down and no longer taking any 298 new allocations */ 299 _brk_start = 0; 300 } 301 302 u64 relocated_ramdisk; 303 304 #ifdef CONFIG_BLK_DEV_INITRD 305 306 static u64 __init get_ramdisk_image(void) 307 { 308 u64 ramdisk_image = boot_params.hdr.ramdisk_image; 309 310 ramdisk_image |= (u64)boot_params.ext_ramdisk_image << 32; 311 312 return ramdisk_image; 313 } 314 static u64 __init get_ramdisk_size(void) 315 { 316 u64 ramdisk_size = boot_params.hdr.ramdisk_size; 317 318 ramdisk_size |= (u64)boot_params.ext_ramdisk_size << 32; 319 320 return ramdisk_size; 321 } 322 323 static void __init relocate_initrd(void) 324 { 325 /* Assume only end is not page aligned */ 326 u64 ramdisk_image = get_ramdisk_image(); 327 u64 ramdisk_size = get_ramdisk_size(); 328 u64 area_size = PAGE_ALIGN(ramdisk_size); 329 330 /* We need to move the initrd down into directly mapped mem */ 331 relocated_ramdisk = memblock_find_in_range(0, PFN_PHYS(max_pfn_mapped), 332 area_size, PAGE_SIZE); 333 334 if (!relocated_ramdisk) 335 panic("Cannot find place for new RAMDISK of size %lld\n", 336 ramdisk_size); 337 338 /* Note: this includes all the mem currently occupied by 339 the initrd, we rely on that fact to keep the data intact. */ 340 memblock_reserve(relocated_ramdisk, area_size); 341 initrd_start = relocated_ramdisk + PAGE_OFFSET; 342 initrd_end = initrd_start + ramdisk_size; 343 printk(KERN_INFO "Allocated new RAMDISK: [mem %#010llx-%#010llx]\n", 344 relocated_ramdisk, relocated_ramdisk + ramdisk_size - 1); 345 346 copy_from_early_mem((void *)initrd_start, ramdisk_image, ramdisk_size); 347 348 printk(KERN_INFO "Move RAMDISK from [mem %#010llx-%#010llx] to" 349 " [mem %#010llx-%#010llx]\n", 350 ramdisk_image, ramdisk_image + ramdisk_size - 1, 351 relocated_ramdisk, relocated_ramdisk + ramdisk_size - 1); 352 } 353 354 static void __init early_reserve_initrd(void) 355 { 356 /* Assume only end is not page aligned */ 357 u64 ramdisk_image = get_ramdisk_image(); 358 u64 ramdisk_size = get_ramdisk_size(); 359 u64 ramdisk_end = PAGE_ALIGN(ramdisk_image + ramdisk_size); 360 361 if (!boot_params.hdr.type_of_loader || 362 !ramdisk_image || !ramdisk_size) 363 return; /* No initrd provided by bootloader */ 364 365 memblock_reserve(ramdisk_image, ramdisk_end - ramdisk_image); 366 } 367 static void __init reserve_initrd(void) 368 { 369 /* Assume only end is not page aligned */ 370 u64 ramdisk_image = get_ramdisk_image(); 371 u64 ramdisk_size = get_ramdisk_size(); 372 u64 ramdisk_end = PAGE_ALIGN(ramdisk_image + ramdisk_size); 373 u64 mapped_size; 374 375 if (!boot_params.hdr.type_of_loader || 376 !ramdisk_image || !ramdisk_size) 377 return; /* No initrd provided by bootloader */ 378 379 initrd_start = 0; 380 381 mapped_size = memblock_mem_size(max_pfn_mapped); 382 if (ramdisk_size >= (mapped_size>>1)) 383 panic("initrd too large to handle, " 384 "disabling initrd (%lld needed, %lld available)\n", 385 ramdisk_size, mapped_size>>1); 386 387 printk(KERN_INFO "RAMDISK: [mem %#010llx-%#010llx]\n", ramdisk_image, 388 ramdisk_end - 1); 389 390 if (pfn_range_is_mapped(PFN_DOWN(ramdisk_image), 391 PFN_DOWN(ramdisk_end))) { 392 /* All are mapped, easy case */ 393 initrd_start = ramdisk_image + PAGE_OFFSET; 394 initrd_end = initrd_start + ramdisk_size; 395 return; 396 } 397 398 relocate_initrd(); 399 400 memblock_free(ramdisk_image, ramdisk_end - ramdisk_image); 401 } 402 403 static void __init early_initrd_acpi_init(void) 404 { 405 early_acpi_table_init((void *)initrd_start, initrd_end - initrd_start); 406 } 407 #else 408 static void __init early_reserve_initrd(void) 409 { 410 } 411 static void __init reserve_initrd(void) 412 { 413 } 414 static void __init early_initrd_acpi_init(void) 415 { 416 } 417 #endif /* CONFIG_BLK_DEV_INITRD */ 418 419 static void __init parse_setup_data(void) 420 { 421 struct setup_data *data; 422 u64 pa_data, pa_next; 423 424 pa_data = boot_params.hdr.setup_data; 425 while (pa_data) { 426 u32 data_len, data_type; 427 428 data = early_memremap(pa_data, sizeof(*data)); 429 data_len = data->len + sizeof(struct setup_data); 430 data_type = data->type; 431 pa_next = data->next; 432 early_memunmap(data, sizeof(*data)); 433 434 switch (data_type) { 435 case SETUP_E820_EXT: 436 parse_e820_ext(pa_data, data_len); 437 break; 438 case SETUP_DTB: 439 add_dtb(pa_data); 440 break; 441 case SETUP_EFI: 442 parse_efi_setup(pa_data, data_len); 443 break; 444 default: 445 break; 446 } 447 pa_data = pa_next; 448 } 449 } 450 451 static void __init e820_reserve_setup_data(void) 452 { 453 struct setup_data *data; 454 u64 pa_data; 455 456 pa_data = boot_params.hdr.setup_data; 457 if (!pa_data) 458 return; 459 460 while (pa_data) { 461 data = early_memremap(pa_data, sizeof(*data)); 462 e820_update_range(pa_data, sizeof(*data)+data->len, 463 E820_RAM, E820_RESERVED_KERN); 464 pa_data = data->next; 465 early_memunmap(data, sizeof(*data)); 466 } 467 468 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); 469 memcpy(&e820_saved, &e820, sizeof(struct e820map)); 470 printk(KERN_INFO "extended physical RAM map:\n"); 471 e820_print_map("reserve setup_data"); 472 } 473 474 static void __init memblock_x86_reserve_range_setup_data(void) 475 { 476 struct setup_data *data; 477 u64 pa_data; 478 479 pa_data = boot_params.hdr.setup_data; 480 while (pa_data) { 481 data = early_memremap(pa_data, sizeof(*data)); 482 memblock_reserve(pa_data, sizeof(*data) + data->len); 483 pa_data = data->next; 484 early_memunmap(data, sizeof(*data)); 485 } 486 } 487 488 /* 489 * --------- Crashkernel reservation ------------------------------ 490 */ 491 492 #ifdef CONFIG_KEXEC_CORE 493 494 /* 16M alignment for crash kernel regions */ 495 #define CRASH_ALIGN (16 << 20) 496 497 /* 498 * Keep the crash kernel below this limit. On 32 bits earlier kernels 499 * would limit the kernel to the low 512 MiB due to mapping restrictions. 500 * On 64bit, old kexec-tools need to under 896MiB. 501 */ 502 #ifdef CONFIG_X86_32 503 # define CRASH_ADDR_LOW_MAX (512 << 20) 504 # define CRASH_ADDR_HIGH_MAX (512 << 20) 505 #else 506 # define CRASH_ADDR_LOW_MAX (896UL << 20) 507 # define CRASH_ADDR_HIGH_MAX MAXMEM 508 #endif 509 510 static int __init reserve_crashkernel_low(void) 511 { 512 #ifdef CONFIG_X86_64 513 unsigned long long base, low_base = 0, low_size = 0; 514 unsigned long total_low_mem; 515 int ret; 516 517 total_low_mem = memblock_mem_size(1UL << (32 - PAGE_SHIFT)); 518 519 /* crashkernel=Y,low */ 520 ret = parse_crashkernel_low(boot_command_line, total_low_mem, &low_size, &base); 521 if (ret) { 522 /* 523 * two parts from lib/swiotlb.c: 524 * -swiotlb size: user-specified with swiotlb= or default. 525 * 526 * -swiotlb overflow buffer: now hardcoded to 32k. We round it 527 * to 8M for other buffers that may need to stay low too. Also 528 * make sure we allocate enough extra low memory so that we 529 * don't run out of DMA buffers for 32-bit devices. 530 */ 531 low_size = max(swiotlb_size_or_default() + (8UL << 20), 256UL << 20); 532 } else { 533 /* passed with crashkernel=0,low ? */ 534 if (!low_size) 535 return 0; 536 } 537 538 low_base = memblock_find_in_range(low_size, 1ULL << 32, low_size, CRASH_ALIGN); 539 if (!low_base) { 540 pr_err("Cannot reserve %ldMB crashkernel low memory, please try smaller size.\n", 541 (unsigned long)(low_size >> 20)); 542 return -ENOMEM; 543 } 544 545 ret = memblock_reserve(low_base, low_size); 546 if (ret) { 547 pr_err("%s: Error reserving crashkernel low memblock.\n", __func__); 548 return ret; 549 } 550 551 pr_info("Reserving %ldMB of low memory at %ldMB for crashkernel (System low RAM: %ldMB)\n", 552 (unsigned long)(low_size >> 20), 553 (unsigned long)(low_base >> 20), 554 (unsigned long)(total_low_mem >> 20)); 555 556 crashk_low_res.start = low_base; 557 crashk_low_res.end = low_base + low_size - 1; 558 insert_resource(&iomem_resource, &crashk_low_res); 559 #endif 560 return 0; 561 } 562 563 static void __init reserve_crashkernel(void) 564 { 565 unsigned long long crash_size, crash_base, total_mem; 566 bool high = false; 567 int ret; 568 569 total_mem = memblock_phys_mem_size(); 570 571 /* crashkernel=XM */ 572 ret = parse_crashkernel(boot_command_line, total_mem, &crash_size, &crash_base); 573 if (ret != 0 || crash_size <= 0) { 574 /* crashkernel=X,high */ 575 ret = parse_crashkernel_high(boot_command_line, total_mem, 576 &crash_size, &crash_base); 577 if (ret != 0 || crash_size <= 0) 578 return; 579 high = true; 580 } 581 582 /* 0 means: find the address automatically */ 583 if (crash_base <= 0) { 584 /* 585 * kexec want bzImage is below CRASH_KERNEL_ADDR_MAX 586 */ 587 crash_base = memblock_find_in_range(CRASH_ALIGN, 588 high ? CRASH_ADDR_HIGH_MAX 589 : CRASH_ADDR_LOW_MAX, 590 crash_size, CRASH_ALIGN); 591 if (!crash_base) { 592 pr_info("crashkernel reservation failed - No suitable area found.\n"); 593 return; 594 } 595 596 } else { 597 unsigned long long start; 598 599 start = memblock_find_in_range(crash_base, 600 crash_base + crash_size, 601 crash_size, 1 << 20); 602 if (start != crash_base) { 603 pr_info("crashkernel reservation failed - memory is in use.\n"); 604 return; 605 } 606 } 607 ret = memblock_reserve(crash_base, crash_size); 608 if (ret) { 609 pr_err("%s: Error reserving crashkernel memblock.\n", __func__); 610 return; 611 } 612 613 if (crash_base >= (1ULL << 32) && reserve_crashkernel_low()) { 614 memblock_free(crash_base, crash_size); 615 return; 616 } 617 618 pr_info("Reserving %ldMB of memory at %ldMB 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 #else 628 static void __init reserve_crashkernel(void) 629 { 630 } 631 #endif 632 633 static struct resource standard_io_resources[] = { 634 { .name = "dma1", .start = 0x00, .end = 0x1f, 635 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 636 { .name = "pic1", .start = 0x20, .end = 0x21, 637 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 638 { .name = "timer0", .start = 0x40, .end = 0x43, 639 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 640 { .name = "timer1", .start = 0x50, .end = 0x53, 641 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 642 { .name = "keyboard", .start = 0x60, .end = 0x60, 643 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 644 { .name = "keyboard", .start = 0x64, .end = 0x64, 645 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 646 { .name = "dma page reg", .start = 0x80, .end = 0x8f, 647 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 648 { .name = "pic2", .start = 0xa0, .end = 0xa1, 649 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 650 { .name = "dma2", .start = 0xc0, .end = 0xdf, 651 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 652 { .name = "fpu", .start = 0xf0, .end = 0xff, 653 .flags = IORESOURCE_BUSY | IORESOURCE_IO } 654 }; 655 656 void __init reserve_standard_io_resources(void) 657 { 658 int i; 659 660 /* request I/O space for devices used on all i[345]86 PCs */ 661 for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++) 662 request_resource(&ioport_resource, &standard_io_resources[i]); 663 664 } 665 666 static __init void reserve_ibft_region(void) 667 { 668 unsigned long addr, size = 0; 669 670 addr = find_ibft_region(&size); 671 672 if (size) 673 memblock_reserve(addr, size); 674 } 675 676 static bool __init snb_gfx_workaround_needed(void) 677 { 678 #ifdef CONFIG_PCI 679 int i; 680 u16 vendor, devid; 681 static const __initconst u16 snb_ids[] = { 682 0x0102, 683 0x0112, 684 0x0122, 685 0x0106, 686 0x0116, 687 0x0126, 688 0x010a, 689 }; 690 691 /* Assume no if something weird is going on with PCI */ 692 if (!early_pci_allowed()) 693 return false; 694 695 vendor = read_pci_config_16(0, 2, 0, PCI_VENDOR_ID); 696 if (vendor != 0x8086) 697 return false; 698 699 devid = read_pci_config_16(0, 2, 0, PCI_DEVICE_ID); 700 for (i = 0; i < ARRAY_SIZE(snb_ids); i++) 701 if (devid == snb_ids[i]) 702 return true; 703 #endif 704 705 return false; 706 } 707 708 /* 709 * Sandy Bridge graphics has trouble with certain ranges, exclude 710 * them from allocation. 711 */ 712 static void __init trim_snb_memory(void) 713 { 714 static const __initconst unsigned long bad_pages[] = { 715 0x20050000, 716 0x20110000, 717 0x20130000, 718 0x20138000, 719 0x40004000, 720 }; 721 int i; 722 723 if (!snb_gfx_workaround_needed()) 724 return; 725 726 printk(KERN_DEBUG "reserving inaccessible SNB gfx pages\n"); 727 728 /* 729 * Reserve all memory below the 1 MB mark that has not 730 * already been reserved. 731 */ 732 memblock_reserve(0, 1<<20); 733 734 for (i = 0; i < ARRAY_SIZE(bad_pages); i++) { 735 if (memblock_reserve(bad_pages[i], PAGE_SIZE)) 736 printk(KERN_WARNING "failed to reserve 0x%08lx\n", 737 bad_pages[i]); 738 } 739 } 740 741 /* 742 * Here we put platform-specific memory range workarounds, i.e. 743 * memory known to be corrupt or otherwise in need to be reserved on 744 * specific platforms. 745 * 746 * If this gets used more widely it could use a real dispatch mechanism. 747 */ 748 static void __init trim_platform_memory_ranges(void) 749 { 750 trim_snb_memory(); 751 } 752 753 static void __init trim_bios_range(void) 754 { 755 /* 756 * A special case is the first 4Kb of memory; 757 * This is a BIOS owned area, not kernel ram, but generally 758 * not listed as such in the E820 table. 759 * 760 * This typically reserves additional memory (64KiB by default) 761 * since some BIOSes are known to corrupt low memory. See the 762 * Kconfig help text for X86_RESERVE_LOW. 763 */ 764 e820_update_range(0, PAGE_SIZE, E820_RAM, E820_RESERVED); 765 766 /* 767 * special case: Some BIOSen report the PC BIOS 768 * area (640->1Mb) as ram even though it is not. 769 * take them out. 770 */ 771 e820_remove_range(BIOS_BEGIN, BIOS_END - BIOS_BEGIN, E820_RAM, 1); 772 773 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); 774 } 775 776 /* called before trim_bios_range() to spare extra sanitize */ 777 static void __init e820_add_kernel_range(void) 778 { 779 u64 start = __pa_symbol(_text); 780 u64 size = __pa_symbol(_end) - start; 781 782 /* 783 * Complain if .text .data and .bss are not marked as E820_RAM and 784 * attempt to fix it by adding the range. We may have a confused BIOS, 785 * or the user may have used memmap=exactmap or memmap=xxM$yyM to 786 * exclude kernel range. If we really are running on top non-RAM, 787 * we will crash later anyways. 788 */ 789 if (e820_all_mapped(start, start + size, E820_RAM)) 790 return; 791 792 pr_warn(".text .data .bss are not marked as E820_RAM!\n"); 793 e820_remove_range(start, size, E820_RAM, 0); 794 e820_add_region(start, size, E820_RAM); 795 } 796 797 static unsigned reserve_low = CONFIG_X86_RESERVE_LOW << 10; 798 799 static int __init parse_reservelow(char *p) 800 { 801 unsigned long long size; 802 803 if (!p) 804 return -EINVAL; 805 806 size = memparse(p, &p); 807 808 if (size < 4096) 809 size = 4096; 810 811 if (size > 640*1024) 812 size = 640*1024; 813 814 reserve_low = size; 815 816 return 0; 817 } 818 819 early_param("reservelow", parse_reservelow); 820 821 static void __init trim_low_memory_range(void) 822 { 823 memblock_reserve(0, ALIGN(reserve_low, PAGE_SIZE)); 824 } 825 826 /* 827 * Dump out kernel offset information on panic. 828 */ 829 static int 830 dump_kernel_offset(struct notifier_block *self, unsigned long v, void *p) 831 { 832 if (kaslr_enabled()) { 833 pr_emerg("Kernel Offset: 0x%lx from 0x%lx (relocation range: 0x%lx-0x%lx)\n", 834 kaslr_offset(), 835 __START_KERNEL, 836 __START_KERNEL_map, 837 MODULES_VADDR-1); 838 } else { 839 pr_emerg("Kernel Offset: disabled\n"); 840 } 841 842 return 0; 843 } 844 845 /* 846 * Determine if we were loaded by an EFI loader. If so, then we have also been 847 * passed the efi memmap, systab, etc., so we should use these data structures 848 * for initialization. Note, the efi init code path is determined by the 849 * global efi_enabled. This allows the same kernel image to be used on existing 850 * systems (with a traditional BIOS) as well as on EFI systems. 851 */ 852 /* 853 * setup_arch - architecture-specific boot-time initializations 854 * 855 * Note: On x86_64, fixmaps are ready for use even before this is called. 856 */ 857 858 void __init setup_arch(char **cmdline_p) 859 { 860 memblock_reserve(__pa_symbol(_text), 861 (unsigned long)__bss_stop - (unsigned long)_text); 862 863 early_reserve_initrd(); 864 865 /* 866 * At this point everything still needed from the boot loader 867 * or BIOS or kernel text should be early reserved or marked not 868 * RAM in e820. All other memory is free game. 869 */ 870 871 #ifdef CONFIG_X86_32 872 memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data)); 873 874 /* 875 * copy kernel address range established so far and switch 876 * to the proper swapper page table 877 */ 878 clone_pgd_range(swapper_pg_dir + KERNEL_PGD_BOUNDARY, 879 initial_page_table + KERNEL_PGD_BOUNDARY, 880 KERNEL_PGD_PTRS); 881 882 load_cr3(swapper_pg_dir); 883 /* 884 * Note: Quark X1000 CPUs advertise PGE incorrectly and require 885 * a cr3 based tlb flush, so the following __flush_tlb_all() 886 * will not flush anything because the cpu quirk which clears 887 * X86_FEATURE_PGE has not been invoked yet. Though due to the 888 * load_cr3() above the TLB has been flushed already. The 889 * quirk is invoked before subsequent calls to __flush_tlb_all() 890 * so proper operation is guaranteed. 891 */ 892 __flush_tlb_all(); 893 #else 894 printk(KERN_INFO "Command line: %s\n", boot_command_line); 895 #endif 896 897 /* 898 * If we have OLPC OFW, we might end up relocating the fixmap due to 899 * reserve_top(), so do this before touching the ioremap area. 900 */ 901 olpc_ofw_detect(); 902 903 early_trap_init(); 904 early_cpu_init(); 905 early_ioremap_init(); 906 907 setup_olpc_ofw_pgd(); 908 909 ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev); 910 screen_info = boot_params.screen_info; 911 edid_info = boot_params.edid_info; 912 #ifdef CONFIG_X86_32 913 apm_info.bios = boot_params.apm_bios_info; 914 ist_info = boot_params.ist_info; 915 #endif 916 saved_video_mode = boot_params.hdr.vid_mode; 917 bootloader_type = boot_params.hdr.type_of_loader; 918 if ((bootloader_type >> 4) == 0xe) { 919 bootloader_type &= 0xf; 920 bootloader_type |= (boot_params.hdr.ext_loader_type+0x10) << 4; 921 } 922 bootloader_version = bootloader_type & 0xf; 923 bootloader_version |= boot_params.hdr.ext_loader_ver << 4; 924 925 #ifdef CONFIG_BLK_DEV_RAM 926 rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK; 927 rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0); 928 rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0); 929 #endif 930 #ifdef CONFIG_EFI 931 if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature, 932 EFI32_LOADER_SIGNATURE, 4)) { 933 set_bit(EFI_BOOT, &efi.flags); 934 } else if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature, 935 EFI64_LOADER_SIGNATURE, 4)) { 936 set_bit(EFI_BOOT, &efi.flags); 937 set_bit(EFI_64BIT, &efi.flags); 938 } 939 940 if (efi_enabled(EFI_BOOT)) 941 efi_memblock_x86_reserve_range(); 942 #endif 943 944 x86_init.oem.arch_setup(); 945 946 kernel_randomize_memory(); 947 948 iomem_resource.end = (1ULL << boot_cpu_data.x86_phys_bits) - 1; 949 setup_memory_map(); 950 parse_setup_data(); 951 952 copy_edd(); 953 954 if (!boot_params.hdr.root_flags) 955 root_mountflags &= ~MS_RDONLY; 956 init_mm.start_code = (unsigned long) _text; 957 init_mm.end_code = (unsigned long) _etext; 958 init_mm.end_data = (unsigned long) _edata; 959 init_mm.brk = _brk_end; 960 961 mpx_mm_init(&init_mm); 962 963 code_resource.start = __pa_symbol(_text); 964 code_resource.end = __pa_symbol(_etext)-1; 965 data_resource.start = __pa_symbol(_etext); 966 data_resource.end = __pa_symbol(_edata)-1; 967 bss_resource.start = __pa_symbol(__bss_start); 968 bss_resource.end = __pa_symbol(__bss_stop)-1; 969 970 #ifdef CONFIG_CMDLINE_BOOL 971 #ifdef CONFIG_CMDLINE_OVERRIDE 972 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE); 973 #else 974 if (builtin_cmdline[0]) { 975 /* append boot loader cmdline to builtin */ 976 strlcat(builtin_cmdline, " ", COMMAND_LINE_SIZE); 977 strlcat(builtin_cmdline, boot_command_line, COMMAND_LINE_SIZE); 978 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE); 979 } 980 #endif 981 #endif 982 983 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE); 984 *cmdline_p = command_line; 985 986 /* 987 * x86_configure_nx() is called before parse_early_param() to detect 988 * whether hardware doesn't support NX (so that the early EHCI debug 989 * console setup can safely call set_fixmap()). It may then be called 990 * again from within noexec_setup() during parsing early parameters 991 * to honor the respective command line option. 992 */ 993 x86_configure_nx(); 994 995 parse_early_param(); 996 997 x86_report_nx(); 998 999 /* after early param, so could get panic from serial */ 1000 memblock_x86_reserve_range_setup_data(); 1001 1002 if (acpi_mps_check()) { 1003 #ifdef CONFIG_X86_LOCAL_APIC 1004 disable_apic = 1; 1005 #endif 1006 setup_clear_cpu_cap(X86_FEATURE_APIC); 1007 } 1008 1009 #ifdef CONFIG_PCI 1010 if (pci_early_dump_regs) 1011 early_dump_pci_devices(); 1012 #endif 1013 1014 /* update the e820_saved too */ 1015 e820_reserve_setup_data(); 1016 finish_e820_parsing(); 1017 1018 if (efi_enabled(EFI_BOOT)) 1019 efi_init(); 1020 1021 dmi_scan_machine(); 1022 dmi_memdev_walk(); 1023 dmi_set_dump_stack_arch_desc(); 1024 1025 /* 1026 * VMware detection requires dmi to be available, so this 1027 * needs to be done after dmi_scan_machine, for the BP. 1028 */ 1029 init_hypervisor_platform(); 1030 1031 x86_init.resources.probe_roms(); 1032 1033 /* after parse_early_param, so could debug it */ 1034 insert_resource(&iomem_resource, &code_resource); 1035 insert_resource(&iomem_resource, &data_resource); 1036 insert_resource(&iomem_resource, &bss_resource); 1037 1038 e820_add_kernel_range(); 1039 trim_bios_range(); 1040 #ifdef CONFIG_X86_32 1041 if (ppro_with_ram_bug()) { 1042 e820_update_range(0x70000000ULL, 0x40000ULL, E820_RAM, 1043 E820_RESERVED); 1044 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); 1045 printk(KERN_INFO "fixed physical RAM map:\n"); 1046 e820_print_map("bad_ppro"); 1047 } 1048 #else 1049 early_gart_iommu_check(); 1050 #endif 1051 1052 /* 1053 * partially used pages are not usable - thus 1054 * we are rounding upwards: 1055 */ 1056 max_pfn = e820_end_of_ram_pfn(); 1057 1058 /* update e820 for memory not covered by WB MTRRs */ 1059 mtrr_bp_init(); 1060 if (mtrr_trim_uncached_memory(max_pfn)) 1061 max_pfn = e820_end_of_ram_pfn(); 1062 1063 max_possible_pfn = max_pfn; 1064 1065 #ifdef CONFIG_X86_32 1066 /* max_low_pfn get updated here */ 1067 find_low_pfn_range(); 1068 #else 1069 check_x2apic(); 1070 1071 /* How many end-of-memory variables you have, grandma! */ 1072 /* need this before calling reserve_initrd */ 1073 if (max_pfn > (1UL<<(32 - PAGE_SHIFT))) 1074 max_low_pfn = e820_end_of_low_ram_pfn(); 1075 else 1076 max_low_pfn = max_pfn; 1077 1078 high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1; 1079 #endif 1080 1081 /* 1082 * Find and reserve possible boot-time SMP configuration: 1083 */ 1084 find_smp_config(); 1085 1086 reserve_ibft_region(); 1087 1088 early_alloc_pgt_buf(); 1089 1090 /* 1091 * Need to conclude brk, before memblock_x86_fill() 1092 * it could use memblock_find_in_range, could overlap with 1093 * brk area. 1094 */ 1095 reserve_brk(); 1096 1097 cleanup_highmap(); 1098 1099 memblock_set_current_limit(ISA_END_ADDRESS); 1100 memblock_x86_fill(); 1101 1102 if (efi_enabled(EFI_BOOT)) { 1103 efi_fake_memmap(); 1104 efi_find_mirror(); 1105 } 1106 1107 /* 1108 * The EFI specification says that boot service code won't be called 1109 * after ExitBootServices(). This is, in fact, a lie. 1110 */ 1111 if (efi_enabled(EFI_MEMMAP)) 1112 efi_reserve_boot_services(); 1113 1114 /* preallocate 4k for mptable mpc */ 1115 early_reserve_e820_mpc_new(); 1116 1117 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION 1118 setup_bios_corruption_check(); 1119 #endif 1120 1121 #ifdef CONFIG_X86_32 1122 printk(KERN_DEBUG "initial memory mapped: [mem 0x00000000-%#010lx]\n", 1123 (max_pfn_mapped<<PAGE_SHIFT) - 1); 1124 #endif 1125 1126 reserve_real_mode(); 1127 1128 trim_platform_memory_ranges(); 1129 trim_low_memory_range(); 1130 1131 init_mem_mapping(); 1132 1133 early_trap_pf_init(); 1134 1135 setup_real_mode(); 1136 1137 memblock_set_current_limit(get_max_mapped()); 1138 1139 /* 1140 * NOTE: On x86-32, only from this point on, fixmaps are ready for use. 1141 */ 1142 1143 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT 1144 if (init_ohci1394_dma_early) 1145 init_ohci1394_dma_on_all_controllers(); 1146 #endif 1147 /* Allocate bigger log buffer */ 1148 setup_log_buf(1); 1149 1150 reserve_initrd(); 1151 1152 early_initrd_acpi_init(); 1153 1154 vsmp_init(); 1155 1156 io_delay_init(); 1157 1158 /* 1159 * Parse the ACPI tables for possible boot-time SMP configuration. 1160 */ 1161 acpi_boot_table_init(); 1162 1163 early_acpi_boot_init(); 1164 1165 initmem_init(); 1166 dma_contiguous_reserve(max_pfn_mapped << PAGE_SHIFT); 1167 1168 /* 1169 * Reserve memory for crash kernel after SRAT is parsed so that it 1170 * won't consume hotpluggable memory. 1171 */ 1172 reserve_crashkernel(); 1173 1174 memblock_find_dma_reserve(); 1175 1176 #ifdef CONFIG_KVM_GUEST 1177 kvmclock_init(); 1178 #endif 1179 1180 x86_init.paging.pagetable_init(); 1181 1182 kasan_init(); 1183 1184 if (boot_cpu_data.cpuid_level >= 0) { 1185 /* A CPU has %cr4 if and only if it has CPUID */ 1186 mmu_cr4_features = __read_cr4(); 1187 if (trampoline_cr4_features) 1188 *trampoline_cr4_features = mmu_cr4_features; 1189 } 1190 1191 #ifdef CONFIG_X86_32 1192 /* sync back kernel address range */ 1193 clone_pgd_range(initial_page_table + KERNEL_PGD_BOUNDARY, 1194 swapper_pg_dir + KERNEL_PGD_BOUNDARY, 1195 KERNEL_PGD_PTRS); 1196 1197 /* 1198 * sync back low identity map too. It is used for example 1199 * in the 32-bit EFI stub. 1200 */ 1201 clone_pgd_range(initial_page_table, 1202 swapper_pg_dir + KERNEL_PGD_BOUNDARY, 1203 min(KERNEL_PGD_PTRS, KERNEL_PGD_BOUNDARY)); 1204 #endif 1205 1206 tboot_probe(); 1207 1208 map_vsyscall(); 1209 1210 generic_apic_probe(); 1211 1212 early_quirks(); 1213 1214 /* 1215 * Read APIC and some other early information from ACPI tables. 1216 */ 1217 acpi_boot_init(); 1218 sfi_init(); 1219 x86_dtb_init(); 1220 1221 /* 1222 * get boot-time SMP configuration: 1223 */ 1224 if (smp_found_config) 1225 get_smp_config(); 1226 1227 prefill_possible_map(); 1228 1229 init_cpu_to_node(); 1230 1231 init_apic_mappings(); 1232 io_apic_init_mappings(); 1233 1234 kvm_guest_init(); 1235 1236 e820_reserve_resources(); 1237 e820_mark_nosave_regions(max_low_pfn); 1238 1239 x86_init.resources.reserve_resources(); 1240 1241 e820_setup_gap(); 1242 1243 #ifdef CONFIG_VT 1244 #if defined(CONFIG_VGA_CONSOLE) 1245 if (!efi_enabled(EFI_BOOT) || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY)) 1246 conswitchp = &vga_con; 1247 #elif defined(CONFIG_DUMMY_CONSOLE) 1248 conswitchp = &dummy_con; 1249 #endif 1250 #endif 1251 x86_init.oem.banner(); 1252 1253 x86_init.timers.wallclock_init(); 1254 1255 mcheck_init(); 1256 1257 arch_init_ideal_nops(); 1258 1259 register_refined_jiffies(CLOCK_TICK_RATE); 1260 1261 #ifdef CONFIG_EFI 1262 if (efi_enabled(EFI_BOOT)) 1263 efi_apply_memmap_quirks(); 1264 #endif 1265 } 1266 1267 #ifdef CONFIG_X86_32 1268 1269 static struct resource video_ram_resource = { 1270 .name = "Video RAM area", 1271 .start = 0xa0000, 1272 .end = 0xbffff, 1273 .flags = IORESOURCE_BUSY | IORESOURCE_MEM 1274 }; 1275 1276 void __init i386_reserve_resources(void) 1277 { 1278 request_resource(&iomem_resource, &video_ram_resource); 1279 reserve_standard_io_resources(); 1280 } 1281 1282 #endif /* CONFIG_X86_32 */ 1283 1284 static struct notifier_block kernel_offset_notifier = { 1285 .notifier_call = dump_kernel_offset 1286 }; 1287 1288 static int __init register_kernel_offset_dumper(void) 1289 { 1290 atomic_notifier_chain_register(&panic_notifier_list, 1291 &kernel_offset_notifier); 1292 return 0; 1293 } 1294 __initcall(register_kernel_offset_dumper); 1295 1296 void arch_show_smap(struct seq_file *m, struct vm_area_struct *vma) 1297 { 1298 if (!boot_cpu_has(X86_FEATURE_OSPKE)) 1299 return; 1300 1301 seq_printf(m, "ProtectionKey: %8u\n", vma_pkey(vma)); 1302 } 1303