1 /* 2 * Copyright (C) 1995 Linus Torvalds 3 * 4 * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999 5 * 6 * Memory region support 7 * David Parsons <orc@pell.chi.il.us>, July-August 1999 8 * 9 * Added E820 sanitization routine (removes overlapping memory regions); 10 * Brian Moyle <bmoyle@mvista.com>, February 2001 11 * 12 * Moved CPU detection code to cpu/${cpu}.c 13 * Patrick Mochel <mochel@osdl.org>, March 2002 14 * 15 * Provisions for empty E820 memory regions (reported by certain BIOSes). 16 * Alex Achenbach <xela@slit.de>, December 2002. 17 * 18 */ 19 20 /* 21 * This file handles the architecture-dependent parts of initialization 22 */ 23 24 #include <linux/sched.h> 25 #include <linux/mm.h> 26 #include <linux/mmzone.h> 27 #include <linux/screen_info.h> 28 #include <linux/ioport.h> 29 #include <linux/acpi.h> 30 #include <linux/sfi.h> 31 #include <linux/apm_bios.h> 32 #include <linux/initrd.h> 33 #include <linux/bootmem.h> 34 #include <linux/memblock.h> 35 #include <linux/seq_file.h> 36 #include <linux/console.h> 37 #include <linux/root_dev.h> 38 #include <linux/highmem.h> 39 #include <linux/module.h> 40 #include <linux/efi.h> 41 #include <linux/init.h> 42 #include <linux/edd.h> 43 #include <linux/iscsi_ibft.h> 44 #include <linux/nodemask.h> 45 #include <linux/kexec.h> 46 #include <linux/dmi.h> 47 #include <linux/pfn.h> 48 #include <linux/pci.h> 49 #include <asm/pci-direct.h> 50 #include <linux/init_ohci1394_dma.h> 51 #include <linux/kvm_para.h> 52 #include <linux/dma-contiguous.h> 53 54 #include <linux/errno.h> 55 #include <linux/kernel.h> 56 #include <linux/stddef.h> 57 #include <linux/unistd.h> 58 #include <linux/ptrace.h> 59 #include <linux/user.h> 60 #include <linux/delay.h> 61 62 #include <linux/kallsyms.h> 63 #include <linux/cpufreq.h> 64 #include <linux/dma-mapping.h> 65 #include <linux/ctype.h> 66 #include <linux/uaccess.h> 67 68 #include <linux/percpu.h> 69 #include <linux/crash_dump.h> 70 #include <linux/tboot.h> 71 #include <linux/jiffies.h> 72 73 #include <video/edid.h> 74 75 #include <asm/mtrr.h> 76 #include <asm/apic.h> 77 #include <asm/realmode.h> 78 #include <asm/e820.h> 79 #include <asm/mpspec.h> 80 #include <asm/setup.h> 81 #include <asm/efi.h> 82 #include <asm/timer.h> 83 #include <asm/i8259.h> 84 #include <asm/sections.h> 85 #include <asm/dmi.h> 86 #include <asm/io_apic.h> 87 #include <asm/ist.h> 88 #include <asm/setup_arch.h> 89 #include <asm/bios_ebda.h> 90 #include <asm/cacheflush.h> 91 #include <asm/processor.h> 92 #include <asm/bugs.h> 93 94 #include <asm/vsyscall.h> 95 #include <asm/cpu.h> 96 #include <asm/desc.h> 97 #include <asm/dma.h> 98 #include <asm/iommu.h> 99 #include <asm/gart.h> 100 #include <asm/mmu_context.h> 101 #include <asm/proto.h> 102 103 #include <asm/paravirt.h> 104 #include <asm/hypervisor.h> 105 #include <asm/olpc_ofw.h> 106 107 #include <asm/percpu.h> 108 #include <asm/topology.h> 109 #include <asm/apicdef.h> 110 #include <asm/amd_nb.h> 111 #ifdef CONFIG_X86_64 112 #include <asm/numa_64.h> 113 #endif 114 #include <asm/mce.h> 115 #include <asm/alternative.h> 116 #include <asm/prom.h> 117 118 /* 119 * end_pfn only includes RAM, while max_pfn_mapped includes all e820 entries. 120 * The direct mapping extends to max_pfn_mapped, so that we can directly access 121 * apertures, ACPI and other tables without having to play with fixmaps. 122 */ 123 unsigned long max_low_pfn_mapped; 124 unsigned long max_pfn_mapped; 125 126 #ifdef CONFIG_DMI 127 RESERVE_BRK(dmi_alloc, 65536); 128 #endif 129 130 131 static __initdata unsigned long _brk_start = (unsigned long)__brk_base; 132 unsigned long _brk_end = (unsigned long)__brk_base; 133 134 #ifdef CONFIG_X86_64 135 int default_cpu_present_to_apicid(int mps_cpu) 136 { 137 return __default_cpu_present_to_apicid(mps_cpu); 138 } 139 140 int default_check_phys_apicid_present(int phys_apicid) 141 { 142 return __default_check_phys_apicid_present(phys_apicid); 143 } 144 #endif 145 146 struct boot_params boot_params; 147 148 /* 149 * Machine setup.. 150 */ 151 static struct resource data_resource = { 152 .name = "Kernel data", 153 .start = 0, 154 .end = 0, 155 .flags = IORESOURCE_BUSY | IORESOURCE_MEM 156 }; 157 158 static struct resource code_resource = { 159 .name = "Kernel code", 160 .start = 0, 161 .end = 0, 162 .flags = IORESOURCE_BUSY | IORESOURCE_MEM 163 }; 164 165 static struct resource bss_resource = { 166 .name = "Kernel bss", 167 .start = 0, 168 .end = 0, 169 .flags = IORESOURCE_BUSY | IORESOURCE_MEM 170 }; 171 172 173 #ifdef CONFIG_X86_32 174 /* cpu data as detected by the assembly code in head.S */ 175 struct cpuinfo_x86 new_cpu_data __cpuinitdata = {0, 0, 0, 0, -1, 1, 0, 0, -1}; 176 /* common cpu data for all cpus */ 177 struct cpuinfo_x86 boot_cpu_data __read_mostly = {0, 0, 0, 0, -1, 1, 0, 0, -1}; 178 EXPORT_SYMBOL(boot_cpu_data); 179 180 unsigned int def_to_bigsmp; 181 182 /* for MCA, but anyone else can use it if they want */ 183 unsigned int machine_id; 184 unsigned int machine_submodel_id; 185 unsigned int BIOS_revision; 186 187 struct apm_info apm_info; 188 EXPORT_SYMBOL(apm_info); 189 190 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \ 191 defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE) 192 struct ist_info ist_info; 193 EXPORT_SYMBOL(ist_info); 194 #else 195 struct ist_info ist_info; 196 #endif 197 198 #else 199 struct cpuinfo_x86 boot_cpu_data __read_mostly = { 200 .x86_phys_bits = MAX_PHYSMEM_BITS, 201 }; 202 EXPORT_SYMBOL(boot_cpu_data); 203 #endif 204 205 206 #if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64) 207 unsigned long mmu_cr4_features; 208 #else 209 unsigned long mmu_cr4_features = X86_CR4_PAE; 210 #endif 211 212 /* Boot loader ID and version as integers, for the benefit of proc_dointvec */ 213 int bootloader_type, bootloader_version; 214 215 /* 216 * Setup options 217 */ 218 struct screen_info screen_info; 219 EXPORT_SYMBOL(screen_info); 220 struct edid_info edid_info; 221 EXPORT_SYMBOL_GPL(edid_info); 222 223 extern int root_mountflags; 224 225 unsigned long saved_video_mode; 226 227 #define RAMDISK_IMAGE_START_MASK 0x07FF 228 #define RAMDISK_PROMPT_FLAG 0x8000 229 #define RAMDISK_LOAD_FLAG 0x4000 230 231 static char __initdata command_line[COMMAND_LINE_SIZE]; 232 #ifdef CONFIG_CMDLINE_BOOL 233 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE; 234 #endif 235 236 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE) 237 struct edd edd; 238 #ifdef CONFIG_EDD_MODULE 239 EXPORT_SYMBOL(edd); 240 #endif 241 /** 242 * copy_edd() - Copy the BIOS EDD information 243 * from boot_params into a safe place. 244 * 245 */ 246 static inline void __init copy_edd(void) 247 { 248 memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer, 249 sizeof(edd.mbr_signature)); 250 memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info)); 251 edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries; 252 edd.edd_info_nr = boot_params.eddbuf_entries; 253 } 254 #else 255 static inline void __init copy_edd(void) 256 { 257 } 258 #endif 259 260 void * __init extend_brk(size_t size, size_t align) 261 { 262 size_t mask = align - 1; 263 void *ret; 264 265 BUG_ON(_brk_start == 0); 266 BUG_ON(align & mask); 267 268 _brk_end = (_brk_end + mask) & ~mask; 269 BUG_ON((char *)(_brk_end + size) > __brk_limit); 270 271 ret = (void *)_brk_end; 272 _brk_end += size; 273 274 memset(ret, 0, size); 275 276 return ret; 277 } 278 279 #ifdef CONFIG_X86_64 280 static void __init init_gbpages(void) 281 { 282 if (direct_gbpages && cpu_has_gbpages) 283 printk(KERN_INFO "Using GB pages for direct mapping\n"); 284 else 285 direct_gbpages = 0; 286 } 287 #else 288 static inline void init_gbpages(void) 289 { 290 } 291 static void __init cleanup_highmap(void) 292 { 293 } 294 #endif 295 296 static void __init reserve_brk(void) 297 { 298 if (_brk_end > _brk_start) 299 memblock_reserve(__pa(_brk_start), 300 __pa(_brk_end) - __pa(_brk_start)); 301 302 /* Mark brk area as locked down and no longer taking any 303 new allocations */ 304 _brk_start = 0; 305 } 306 307 #ifdef CONFIG_BLK_DEV_INITRD 308 309 #define MAX_MAP_CHUNK (NR_FIX_BTMAPS << PAGE_SHIFT) 310 static void __init relocate_initrd(void) 311 { 312 /* Assume only end is not page aligned */ 313 u64 ramdisk_image = boot_params.hdr.ramdisk_image; 314 u64 ramdisk_size = boot_params.hdr.ramdisk_size; 315 u64 area_size = PAGE_ALIGN(ramdisk_size); 316 u64 end_of_lowmem = max_low_pfn_mapped << PAGE_SHIFT; 317 u64 ramdisk_here; 318 unsigned long slop, clen, mapaddr; 319 char *p, *q; 320 321 /* We need to move the initrd down into lowmem */ 322 ramdisk_here = memblock_find_in_range(0, end_of_lowmem, area_size, 323 PAGE_SIZE); 324 325 if (!ramdisk_here) 326 panic("Cannot find place for new RAMDISK of size %lld\n", 327 ramdisk_size); 328 329 /* Note: this includes all the lowmem currently occupied by 330 the initrd, we rely on that fact to keep the data intact. */ 331 memblock_reserve(ramdisk_here, area_size); 332 initrd_start = ramdisk_here + PAGE_OFFSET; 333 initrd_end = initrd_start + ramdisk_size; 334 printk(KERN_INFO "Allocated new RAMDISK: [mem %#010llx-%#010llx]\n", 335 ramdisk_here, ramdisk_here + ramdisk_size - 1); 336 337 q = (char *)initrd_start; 338 339 /* Copy any lowmem portion of the initrd */ 340 if (ramdisk_image < end_of_lowmem) { 341 clen = end_of_lowmem - ramdisk_image; 342 p = (char *)__va(ramdisk_image); 343 memcpy(q, p, clen); 344 q += clen; 345 ramdisk_image += clen; 346 ramdisk_size -= clen; 347 } 348 349 /* Copy the highmem portion of the initrd */ 350 while (ramdisk_size) { 351 slop = ramdisk_image & ~PAGE_MASK; 352 clen = ramdisk_size; 353 if (clen > MAX_MAP_CHUNK-slop) 354 clen = MAX_MAP_CHUNK-slop; 355 mapaddr = ramdisk_image & PAGE_MASK; 356 p = early_memremap(mapaddr, clen+slop); 357 memcpy(q, p+slop, clen); 358 early_iounmap(p, clen+slop); 359 q += clen; 360 ramdisk_image += clen; 361 ramdisk_size -= clen; 362 } 363 /* high pages is not converted by early_res_to_bootmem */ 364 ramdisk_image = boot_params.hdr.ramdisk_image; 365 ramdisk_size = boot_params.hdr.ramdisk_size; 366 printk(KERN_INFO "Move RAMDISK from [mem %#010llx-%#010llx] to" 367 " [mem %#010llx-%#010llx]\n", 368 ramdisk_image, ramdisk_image + ramdisk_size - 1, 369 ramdisk_here, ramdisk_here + ramdisk_size - 1); 370 } 371 372 static void __init reserve_initrd(void) 373 { 374 /* Assume only end is not page aligned */ 375 u64 ramdisk_image = boot_params.hdr.ramdisk_image; 376 u64 ramdisk_size = boot_params.hdr.ramdisk_size; 377 u64 ramdisk_end = PAGE_ALIGN(ramdisk_image + ramdisk_size); 378 u64 end_of_lowmem = max_low_pfn_mapped << PAGE_SHIFT; 379 380 if (!boot_params.hdr.type_of_loader || 381 !ramdisk_image || !ramdisk_size) 382 return; /* No initrd provided by bootloader */ 383 384 initrd_start = 0; 385 386 if (ramdisk_size >= (end_of_lowmem>>1)) { 387 panic("initrd too large to handle, " 388 "disabling initrd (%lld needed, %lld available)\n", 389 ramdisk_size, end_of_lowmem>>1); 390 } 391 392 printk(KERN_INFO "RAMDISK: [mem %#010llx-%#010llx]\n", ramdisk_image, 393 ramdisk_end - 1); 394 395 396 if (ramdisk_end <= end_of_lowmem) { 397 /* All in lowmem, easy case */ 398 /* 399 * don't need to reserve again, already reserved early 400 * in i386_start_kernel 401 */ 402 initrd_start = ramdisk_image + PAGE_OFFSET; 403 initrd_end = initrd_start + ramdisk_size; 404 return; 405 } 406 407 relocate_initrd(); 408 409 memblock_free(ramdisk_image, ramdisk_end - ramdisk_image); 410 } 411 #else 412 static void __init reserve_initrd(void) 413 { 414 } 415 #endif /* CONFIG_BLK_DEV_INITRD */ 416 417 static void __init parse_setup_data(void) 418 { 419 struct setup_data *data; 420 u64 pa_data; 421 422 if (boot_params.hdr.version < 0x0209) 423 return; 424 pa_data = boot_params.hdr.setup_data; 425 while (pa_data) { 426 u32 data_len, map_len; 427 428 map_len = max(PAGE_SIZE - (pa_data & ~PAGE_MASK), 429 (u64)sizeof(struct setup_data)); 430 data = early_memremap(pa_data, map_len); 431 data_len = data->len + sizeof(struct setup_data); 432 if (data_len > map_len) { 433 early_iounmap(data, map_len); 434 data = early_memremap(pa_data, data_len); 435 map_len = data_len; 436 } 437 438 switch (data->type) { 439 case SETUP_E820_EXT: 440 parse_e820_ext(data); 441 break; 442 case SETUP_DTB: 443 add_dtb(pa_data); 444 break; 445 default: 446 break; 447 } 448 pa_data = data->next; 449 early_iounmap(data, map_len); 450 } 451 } 452 453 static void __init e820_reserve_setup_data(void) 454 { 455 struct setup_data *data; 456 u64 pa_data; 457 int found = 0; 458 459 if (boot_params.hdr.version < 0x0209) 460 return; 461 pa_data = boot_params.hdr.setup_data; 462 while (pa_data) { 463 data = early_memremap(pa_data, sizeof(*data)); 464 e820_update_range(pa_data, sizeof(*data)+data->len, 465 E820_RAM, E820_RESERVED_KERN); 466 found = 1; 467 pa_data = data->next; 468 early_iounmap(data, sizeof(*data)); 469 } 470 if (!found) 471 return; 472 473 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); 474 memcpy(&e820_saved, &e820, sizeof(struct e820map)); 475 printk(KERN_INFO "extended physical RAM map:\n"); 476 e820_print_map("reserve setup_data"); 477 } 478 479 static void __init memblock_x86_reserve_range_setup_data(void) 480 { 481 struct setup_data *data; 482 u64 pa_data; 483 484 if (boot_params.hdr.version < 0x0209) 485 return; 486 pa_data = boot_params.hdr.setup_data; 487 while (pa_data) { 488 data = early_memremap(pa_data, sizeof(*data)); 489 memblock_reserve(pa_data, sizeof(*data) + data->len); 490 pa_data = data->next; 491 early_iounmap(data, sizeof(*data)); 492 } 493 } 494 495 /* 496 * --------- Crashkernel reservation ------------------------------ 497 */ 498 499 #ifdef CONFIG_KEXEC 500 501 /* 502 * Keep the crash kernel below this limit. On 32 bits earlier kernels 503 * would limit the kernel to the low 512 MiB due to mapping restrictions. 504 * On 64 bits, kexec-tools currently limits us to 896 MiB; increase this 505 * limit once kexec-tools are fixed. 506 */ 507 #ifdef CONFIG_X86_32 508 # define CRASH_KERNEL_ADDR_MAX (512 << 20) 509 #else 510 # define CRASH_KERNEL_ADDR_MAX (896 << 20) 511 #endif 512 513 static void __init reserve_crashkernel(void) 514 { 515 unsigned long long total_mem; 516 unsigned long long crash_size, crash_base; 517 int ret; 518 519 total_mem = memblock_phys_mem_size(); 520 521 ret = parse_crashkernel(boot_command_line, total_mem, 522 &crash_size, &crash_base); 523 if (ret != 0 || crash_size <= 0) 524 return; 525 526 /* 0 means: find the address automatically */ 527 if (crash_base <= 0) { 528 const unsigned long long alignment = 16<<20; /* 16M */ 529 530 /* 531 * kexec want bzImage is below CRASH_KERNEL_ADDR_MAX 532 */ 533 crash_base = memblock_find_in_range(alignment, 534 CRASH_KERNEL_ADDR_MAX, crash_size, alignment); 535 536 if (!crash_base) { 537 pr_info("crashkernel reservation failed - No suitable area found.\n"); 538 return; 539 } 540 } else { 541 unsigned long long start; 542 543 start = memblock_find_in_range(crash_base, 544 crash_base + crash_size, crash_size, 1<<20); 545 if (start != crash_base) { 546 pr_info("crashkernel reservation failed - memory is in use.\n"); 547 return; 548 } 549 } 550 memblock_reserve(crash_base, crash_size); 551 552 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB " 553 "for crashkernel (System RAM: %ldMB)\n", 554 (unsigned long)(crash_size >> 20), 555 (unsigned long)(crash_base >> 20), 556 (unsigned long)(total_mem >> 20)); 557 558 crashk_res.start = crash_base; 559 crashk_res.end = crash_base + crash_size - 1; 560 insert_resource(&iomem_resource, &crashk_res); 561 } 562 #else 563 static void __init reserve_crashkernel(void) 564 { 565 } 566 #endif 567 568 static struct resource standard_io_resources[] = { 569 { .name = "dma1", .start = 0x00, .end = 0x1f, 570 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 571 { .name = "pic1", .start = 0x20, .end = 0x21, 572 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 573 { .name = "timer0", .start = 0x40, .end = 0x43, 574 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 575 { .name = "timer1", .start = 0x50, .end = 0x53, 576 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 577 { .name = "keyboard", .start = 0x60, .end = 0x60, 578 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 579 { .name = "keyboard", .start = 0x64, .end = 0x64, 580 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 581 { .name = "dma page reg", .start = 0x80, .end = 0x8f, 582 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 583 { .name = "pic2", .start = 0xa0, .end = 0xa1, 584 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 585 { .name = "dma2", .start = 0xc0, .end = 0xdf, 586 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 587 { .name = "fpu", .start = 0xf0, .end = 0xff, 588 .flags = IORESOURCE_BUSY | IORESOURCE_IO } 589 }; 590 591 void __init reserve_standard_io_resources(void) 592 { 593 int i; 594 595 /* request I/O space for devices used on all i[345]86 PCs */ 596 for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++) 597 request_resource(&ioport_resource, &standard_io_resources[i]); 598 599 } 600 601 static __init void reserve_ibft_region(void) 602 { 603 unsigned long addr, size = 0; 604 605 addr = find_ibft_region(&size); 606 607 if (size) 608 memblock_reserve(addr, size); 609 } 610 611 static unsigned reserve_low = CONFIG_X86_RESERVE_LOW << 10; 612 613 static bool __init snb_gfx_workaround_needed(void) 614 { 615 #ifdef CONFIG_PCI 616 int i; 617 u16 vendor, devid; 618 static const __initconst u16 snb_ids[] = { 619 0x0102, 620 0x0112, 621 0x0122, 622 0x0106, 623 0x0116, 624 0x0126, 625 0x010a, 626 }; 627 628 /* Assume no if something weird is going on with PCI */ 629 if (!early_pci_allowed()) 630 return false; 631 632 vendor = read_pci_config_16(0, 2, 0, PCI_VENDOR_ID); 633 if (vendor != 0x8086) 634 return false; 635 636 devid = read_pci_config_16(0, 2, 0, PCI_DEVICE_ID); 637 for (i = 0; i < ARRAY_SIZE(snb_ids); i++) 638 if (devid == snb_ids[i]) 639 return true; 640 #endif 641 642 return false; 643 } 644 645 /* 646 * Sandy Bridge graphics has trouble with certain ranges, exclude 647 * them from allocation. 648 */ 649 static void __init trim_snb_memory(void) 650 { 651 static const __initconst unsigned long bad_pages[] = { 652 0x20050000, 653 0x20110000, 654 0x20130000, 655 0x20138000, 656 0x40004000, 657 }; 658 int i; 659 660 if (!snb_gfx_workaround_needed()) 661 return; 662 663 printk(KERN_DEBUG "reserving inaccessible SNB gfx pages\n"); 664 665 /* 666 * Reserve all memory below the 1 MB mark that has not 667 * already been reserved. 668 */ 669 memblock_reserve(0, 1<<20); 670 671 for (i = 0; i < ARRAY_SIZE(bad_pages); i++) { 672 if (memblock_reserve(bad_pages[i], PAGE_SIZE)) 673 printk(KERN_WARNING "failed to reserve 0x%08lx\n", 674 bad_pages[i]); 675 } 676 } 677 678 /* 679 * Here we put platform-specific memory range workarounds, i.e. 680 * memory known to be corrupt or otherwise in need to be reserved on 681 * specific platforms. 682 * 683 * If this gets used more widely it could use a real dispatch mechanism. 684 */ 685 static void __init trim_platform_memory_ranges(void) 686 { 687 trim_snb_memory(); 688 } 689 690 static void __init trim_bios_range(void) 691 { 692 /* 693 * A special case is the first 4Kb of memory; 694 * This is a BIOS owned area, not kernel ram, but generally 695 * not listed as such in the E820 table. 696 * 697 * This typically reserves additional memory (64KiB by default) 698 * since some BIOSes are known to corrupt low memory. See the 699 * Kconfig help text for X86_RESERVE_LOW. 700 */ 701 e820_update_range(0, ALIGN(reserve_low, PAGE_SIZE), 702 E820_RAM, E820_RESERVED); 703 704 /* 705 * special case: Some BIOSen report the PC BIOS 706 * area (640->1Mb) as ram even though it is not. 707 * take them out. 708 */ 709 e820_remove_range(BIOS_BEGIN, BIOS_END - BIOS_BEGIN, E820_RAM, 1); 710 711 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); 712 } 713 714 static int __init parse_reservelow(char *p) 715 { 716 unsigned long long size; 717 718 if (!p) 719 return -EINVAL; 720 721 size = memparse(p, &p); 722 723 if (size < 4096) 724 size = 4096; 725 726 if (size > 640*1024) 727 size = 640*1024; 728 729 reserve_low = size; 730 731 return 0; 732 } 733 734 early_param("reservelow", parse_reservelow); 735 736 /* 737 * Determine if we were loaded by an EFI loader. If so, then we have also been 738 * passed the efi memmap, systab, etc., so we should use these data structures 739 * for initialization. Note, the efi init code path is determined by the 740 * global efi_enabled. This allows the same kernel image to be used on existing 741 * systems (with a traditional BIOS) as well as on EFI systems. 742 */ 743 /* 744 * setup_arch - architecture-specific boot-time initializations 745 * 746 * Note: On x86_64, fixmaps are ready for use even before this is called. 747 */ 748 749 void __init setup_arch(char **cmdline_p) 750 { 751 #ifdef CONFIG_X86_32 752 memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data)); 753 visws_early_detect(); 754 755 /* 756 * copy kernel address range established so far and switch 757 * to the proper swapper page table 758 */ 759 clone_pgd_range(swapper_pg_dir + KERNEL_PGD_BOUNDARY, 760 initial_page_table + KERNEL_PGD_BOUNDARY, 761 KERNEL_PGD_PTRS); 762 763 load_cr3(swapper_pg_dir); 764 __flush_tlb_all(); 765 #else 766 printk(KERN_INFO "Command line: %s\n", boot_command_line); 767 #endif 768 769 /* 770 * If we have OLPC OFW, we might end up relocating the fixmap due to 771 * reserve_top(), so do this before touching the ioremap area. 772 */ 773 olpc_ofw_detect(); 774 775 early_trap_init(); 776 early_cpu_init(); 777 early_ioremap_init(); 778 779 setup_olpc_ofw_pgd(); 780 781 ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev); 782 screen_info = boot_params.screen_info; 783 edid_info = boot_params.edid_info; 784 #ifdef CONFIG_X86_32 785 apm_info.bios = boot_params.apm_bios_info; 786 ist_info = boot_params.ist_info; 787 if (boot_params.sys_desc_table.length != 0) { 788 machine_id = boot_params.sys_desc_table.table[0]; 789 machine_submodel_id = boot_params.sys_desc_table.table[1]; 790 BIOS_revision = boot_params.sys_desc_table.table[2]; 791 } 792 #endif 793 saved_video_mode = boot_params.hdr.vid_mode; 794 bootloader_type = boot_params.hdr.type_of_loader; 795 if ((bootloader_type >> 4) == 0xe) { 796 bootloader_type &= 0xf; 797 bootloader_type |= (boot_params.hdr.ext_loader_type+0x10) << 4; 798 } 799 bootloader_version = bootloader_type & 0xf; 800 bootloader_version |= boot_params.hdr.ext_loader_ver << 4; 801 802 #ifdef CONFIG_BLK_DEV_RAM 803 rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK; 804 rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0); 805 rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0); 806 #endif 807 #ifdef CONFIG_EFI 808 if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature, 809 "EL32", 4)) { 810 set_bit(EFI_BOOT, &x86_efi_facility); 811 } else if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature, 812 "EL64", 4)) { 813 set_bit(EFI_BOOT, &x86_efi_facility); 814 set_bit(EFI_64BIT, &x86_efi_facility); 815 } 816 817 if (efi_enabled(EFI_BOOT)) 818 efi_memblock_x86_reserve_range(); 819 #endif 820 821 x86_init.oem.arch_setup(); 822 823 iomem_resource.end = (1ULL << boot_cpu_data.x86_phys_bits) - 1; 824 setup_memory_map(); 825 parse_setup_data(); 826 /* update the e820_saved too */ 827 e820_reserve_setup_data(); 828 829 copy_edd(); 830 831 if (!boot_params.hdr.root_flags) 832 root_mountflags &= ~MS_RDONLY; 833 init_mm.start_code = (unsigned long) _text; 834 init_mm.end_code = (unsigned long) _etext; 835 init_mm.end_data = (unsigned long) _edata; 836 init_mm.brk = _brk_end; 837 838 code_resource.start = virt_to_phys(_text); 839 code_resource.end = virt_to_phys(_etext)-1; 840 data_resource.start = virt_to_phys(_etext); 841 data_resource.end = virt_to_phys(_edata)-1; 842 bss_resource.start = virt_to_phys(&__bss_start); 843 bss_resource.end = virt_to_phys(&__bss_stop)-1; 844 845 #ifdef CONFIG_CMDLINE_BOOL 846 #ifdef CONFIG_CMDLINE_OVERRIDE 847 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE); 848 #else 849 if (builtin_cmdline[0]) { 850 /* append boot loader cmdline to builtin */ 851 strlcat(builtin_cmdline, " ", COMMAND_LINE_SIZE); 852 strlcat(builtin_cmdline, boot_command_line, COMMAND_LINE_SIZE); 853 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE); 854 } 855 #endif 856 #endif 857 858 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE); 859 *cmdline_p = command_line; 860 861 /* 862 * x86_configure_nx() is called before parse_early_param() to detect 863 * whether hardware doesn't support NX (so that the early EHCI debug 864 * console setup can safely call set_fixmap()). It may then be called 865 * again from within noexec_setup() during parsing early parameters 866 * to honor the respective command line option. 867 */ 868 x86_configure_nx(); 869 870 parse_early_param(); 871 872 x86_report_nx(); 873 874 /* after early param, so could get panic from serial */ 875 memblock_x86_reserve_range_setup_data(); 876 877 if (acpi_mps_check()) { 878 #ifdef CONFIG_X86_LOCAL_APIC 879 disable_apic = 1; 880 #endif 881 setup_clear_cpu_cap(X86_FEATURE_APIC); 882 } 883 884 #ifdef CONFIG_PCI 885 if (pci_early_dump_regs) 886 early_dump_pci_devices(); 887 #endif 888 889 finish_e820_parsing(); 890 891 if (efi_enabled(EFI_BOOT)) 892 efi_init(); 893 894 dmi_scan_machine(); 895 896 /* 897 * VMware detection requires dmi to be available, so this 898 * needs to be done after dmi_scan_machine, for the BP. 899 */ 900 init_hypervisor_platform(); 901 902 x86_init.resources.probe_roms(); 903 904 /* after parse_early_param, so could debug it */ 905 insert_resource(&iomem_resource, &code_resource); 906 insert_resource(&iomem_resource, &data_resource); 907 insert_resource(&iomem_resource, &bss_resource); 908 909 trim_bios_range(); 910 #ifdef CONFIG_X86_32 911 if (ppro_with_ram_bug()) { 912 e820_update_range(0x70000000ULL, 0x40000ULL, E820_RAM, 913 E820_RESERVED); 914 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); 915 printk(KERN_INFO "fixed physical RAM map:\n"); 916 e820_print_map("bad_ppro"); 917 } 918 #else 919 early_gart_iommu_check(); 920 #endif 921 922 /* 923 * partially used pages are not usable - thus 924 * we are rounding upwards: 925 */ 926 max_pfn = e820_end_of_ram_pfn(); 927 928 /* update e820 for memory not covered by WB MTRRs */ 929 mtrr_bp_init(); 930 if (mtrr_trim_uncached_memory(max_pfn)) 931 max_pfn = e820_end_of_ram_pfn(); 932 933 #ifdef CONFIG_X86_32 934 /* max_low_pfn get updated here */ 935 find_low_pfn_range(); 936 #else 937 num_physpages = max_pfn; 938 939 check_x2apic(); 940 941 /* How many end-of-memory variables you have, grandma! */ 942 /* need this before calling reserve_initrd */ 943 if (max_pfn > (1UL<<(32 - PAGE_SHIFT))) 944 max_low_pfn = e820_end_of_low_ram_pfn(); 945 else 946 max_low_pfn = max_pfn; 947 948 high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1; 949 #endif 950 951 /* 952 * Find and reserve possible boot-time SMP configuration: 953 */ 954 find_smp_config(); 955 956 reserve_ibft_region(); 957 958 /* 959 * Need to conclude brk, before memblock_x86_fill() 960 * it could use memblock_find_in_range, could overlap with 961 * brk area. 962 */ 963 reserve_brk(); 964 965 cleanup_highmap(); 966 967 memblock.current_limit = get_max_mapped(); 968 memblock_x86_fill(); 969 970 /* 971 * The EFI specification says that boot service code won't be called 972 * after ExitBootServices(). This is, in fact, a lie. 973 */ 974 if (efi_enabled(EFI_MEMMAP)) 975 efi_reserve_boot_services(); 976 977 /* preallocate 4k for mptable mpc */ 978 early_reserve_e820_mpc_new(); 979 980 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION 981 setup_bios_corruption_check(); 982 #endif 983 984 printk(KERN_DEBUG "initial memory mapped: [mem 0x00000000-%#010lx]\n", 985 (max_pfn_mapped<<PAGE_SHIFT) - 1); 986 987 setup_real_mode(); 988 989 trim_platform_memory_ranges(); 990 991 init_gbpages(); 992 993 /* max_pfn_mapped is updated here */ 994 max_low_pfn_mapped = init_memory_mapping(0, max_low_pfn<<PAGE_SHIFT); 995 max_pfn_mapped = max_low_pfn_mapped; 996 997 #ifdef CONFIG_X86_64 998 if (max_pfn > max_low_pfn) { 999 int i; 1000 unsigned long start, end; 1001 unsigned long start_pfn, end_pfn; 1002 1003 for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, 1004 NULL) { 1005 1006 end = PFN_PHYS(end_pfn); 1007 if (end <= (1UL<<32)) 1008 continue; 1009 1010 start = PFN_PHYS(start_pfn); 1011 max_pfn_mapped = init_memory_mapping( 1012 max((1UL<<32), start), end); 1013 } 1014 1015 /* can we preseve max_low_pfn ?*/ 1016 max_low_pfn = max_pfn; 1017 } 1018 #endif 1019 memblock.current_limit = get_max_mapped(); 1020 dma_contiguous_reserve(0); 1021 1022 /* 1023 * NOTE: On x86-32, only from this point on, fixmaps are ready for use. 1024 */ 1025 1026 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT 1027 if (init_ohci1394_dma_early) 1028 init_ohci1394_dma_on_all_controllers(); 1029 #endif 1030 /* Allocate bigger log buffer */ 1031 setup_log_buf(1); 1032 1033 reserve_initrd(); 1034 1035 #if defined(CONFIG_ACPI) && defined(CONFIG_BLK_DEV_INITRD) 1036 acpi_initrd_override((void *)initrd_start, initrd_end - initrd_start); 1037 #endif 1038 1039 reserve_crashkernel(); 1040 1041 vsmp_init(); 1042 1043 io_delay_init(); 1044 1045 /* 1046 * Parse the ACPI tables for possible boot-time SMP configuration. 1047 */ 1048 acpi_boot_table_init(); 1049 1050 early_acpi_boot_init(); 1051 1052 initmem_init(); 1053 memblock_find_dma_reserve(); 1054 1055 #ifdef CONFIG_KVM_GUEST 1056 kvmclock_init(); 1057 #endif 1058 1059 x86_init.paging.pagetable_init(); 1060 1061 if (boot_cpu_data.cpuid_level >= 0) { 1062 /* A CPU has %cr4 if and only if it has CPUID */ 1063 mmu_cr4_features = read_cr4(); 1064 if (trampoline_cr4_features) 1065 *trampoline_cr4_features = mmu_cr4_features; 1066 } 1067 1068 #ifdef CONFIG_X86_32 1069 /* sync back kernel address range */ 1070 clone_pgd_range(initial_page_table + KERNEL_PGD_BOUNDARY, 1071 swapper_pg_dir + KERNEL_PGD_BOUNDARY, 1072 KERNEL_PGD_PTRS); 1073 #endif 1074 1075 tboot_probe(); 1076 1077 #ifdef CONFIG_X86_64 1078 map_vsyscall(); 1079 #endif 1080 1081 generic_apic_probe(); 1082 1083 early_quirks(); 1084 1085 /* 1086 * Read APIC and some other early information from ACPI tables. 1087 */ 1088 acpi_boot_init(); 1089 sfi_init(); 1090 x86_dtb_init(); 1091 1092 /* 1093 * get boot-time SMP configuration: 1094 */ 1095 if (smp_found_config) 1096 get_smp_config(); 1097 1098 prefill_possible_map(); 1099 1100 init_cpu_to_node(); 1101 1102 init_apic_mappings(); 1103 if (x86_io_apic_ops.init) 1104 x86_io_apic_ops.init(); 1105 1106 kvm_guest_init(); 1107 1108 e820_reserve_resources(); 1109 e820_mark_nosave_regions(max_low_pfn); 1110 1111 x86_init.resources.reserve_resources(); 1112 1113 e820_setup_gap(); 1114 1115 #ifdef CONFIG_VT 1116 #if defined(CONFIG_VGA_CONSOLE) 1117 if (!efi_enabled(EFI_BOOT) || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY)) 1118 conswitchp = &vga_con; 1119 #elif defined(CONFIG_DUMMY_CONSOLE) 1120 conswitchp = &dummy_con; 1121 #endif 1122 #endif 1123 x86_init.oem.banner(); 1124 1125 x86_init.timers.wallclock_init(); 1126 1127 mcheck_init(); 1128 1129 arch_init_ideal_nops(); 1130 1131 register_refined_jiffies(CLOCK_TICK_RATE); 1132 1133 #ifdef CONFIG_EFI 1134 /* Once setup is done above, unmap the EFI memory map on 1135 * mismatched firmware/kernel archtectures since there is no 1136 * support for runtime services. 1137 */ 1138 if (efi_enabled(EFI_BOOT) && 1139 IS_ENABLED(CONFIG_X86_64) != efi_enabled(EFI_64BIT)) { 1140 pr_info("efi: Setup done, disabling due to 32/64-bit mismatch\n"); 1141 efi_unmap_memmap(); 1142 } 1143 #endif 1144 } 1145 1146 #ifdef CONFIG_X86_32 1147 1148 static struct resource video_ram_resource = { 1149 .name = "Video RAM area", 1150 .start = 0xa0000, 1151 .end = 0xbffff, 1152 .flags = IORESOURCE_BUSY | IORESOURCE_MEM 1153 }; 1154 1155 void __init i386_reserve_resources(void) 1156 { 1157 request_resource(&iomem_resource, &video_ram_resource); 1158 reserve_standard_io_resources(); 1159 } 1160 1161 #endif /* CONFIG_X86_32 */ 1162