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 #ifndef CONFIG_DEBUG_BOOT_PARAMS 147 struct boot_params __initdata boot_params; 148 #else 149 struct boot_params boot_params; 150 #endif 151 152 /* 153 * Machine setup.. 154 */ 155 static struct resource data_resource = { 156 .name = "Kernel data", 157 .start = 0, 158 .end = 0, 159 .flags = IORESOURCE_BUSY | IORESOURCE_MEM 160 }; 161 162 static struct resource code_resource = { 163 .name = "Kernel code", 164 .start = 0, 165 .end = 0, 166 .flags = IORESOURCE_BUSY | IORESOURCE_MEM 167 }; 168 169 static struct resource bss_resource = { 170 .name = "Kernel bss", 171 .start = 0, 172 .end = 0, 173 .flags = IORESOURCE_BUSY | IORESOURCE_MEM 174 }; 175 176 177 #ifdef CONFIG_X86_32 178 /* cpu data as detected by the assembly code in head.S */ 179 struct cpuinfo_x86 new_cpu_data __cpuinitdata = {0, 0, 0, 0, -1, 1, 0, 0, -1}; 180 /* common cpu data for all cpus */ 181 struct cpuinfo_x86 boot_cpu_data __read_mostly = {0, 0, 0, 0, -1, 1, 0, 0, -1}; 182 EXPORT_SYMBOL(boot_cpu_data); 183 184 unsigned int def_to_bigsmp; 185 186 /* for MCA, but anyone else can use it if they want */ 187 unsigned int machine_id; 188 unsigned int machine_submodel_id; 189 unsigned int BIOS_revision; 190 191 struct apm_info apm_info; 192 EXPORT_SYMBOL(apm_info); 193 194 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \ 195 defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE) 196 struct ist_info ist_info; 197 EXPORT_SYMBOL(ist_info); 198 #else 199 struct ist_info ist_info; 200 #endif 201 202 #else 203 struct cpuinfo_x86 boot_cpu_data __read_mostly = { 204 .x86_phys_bits = MAX_PHYSMEM_BITS, 205 }; 206 EXPORT_SYMBOL(boot_cpu_data); 207 #endif 208 209 210 #if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64) 211 unsigned long mmu_cr4_features; 212 #else 213 unsigned long mmu_cr4_features = X86_CR4_PAE; 214 #endif 215 216 /* Boot loader ID and version as integers, for the benefit of proc_dointvec */ 217 int bootloader_type, bootloader_version; 218 219 /* 220 * Setup options 221 */ 222 struct screen_info screen_info; 223 EXPORT_SYMBOL(screen_info); 224 struct edid_info edid_info; 225 EXPORT_SYMBOL_GPL(edid_info); 226 227 extern int root_mountflags; 228 229 unsigned long saved_video_mode; 230 231 #define RAMDISK_IMAGE_START_MASK 0x07FF 232 #define RAMDISK_PROMPT_FLAG 0x8000 233 #define RAMDISK_LOAD_FLAG 0x4000 234 235 static char __initdata command_line[COMMAND_LINE_SIZE]; 236 #ifdef CONFIG_CMDLINE_BOOL 237 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE; 238 #endif 239 240 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE) 241 struct edd edd; 242 #ifdef CONFIG_EDD_MODULE 243 EXPORT_SYMBOL(edd); 244 #endif 245 /** 246 * copy_edd() - Copy the BIOS EDD information 247 * from boot_params into a safe place. 248 * 249 */ 250 static inline void __init copy_edd(void) 251 { 252 memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer, 253 sizeof(edd.mbr_signature)); 254 memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info)); 255 edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries; 256 edd.edd_info_nr = boot_params.eddbuf_entries; 257 } 258 #else 259 static inline void __init copy_edd(void) 260 { 261 } 262 #endif 263 264 void * __init extend_brk(size_t size, size_t align) 265 { 266 size_t mask = align - 1; 267 void *ret; 268 269 BUG_ON(_brk_start == 0); 270 BUG_ON(align & mask); 271 272 _brk_end = (_brk_end + mask) & ~mask; 273 BUG_ON((char *)(_brk_end + size) > __brk_limit); 274 275 ret = (void *)_brk_end; 276 _brk_end += size; 277 278 memset(ret, 0, size); 279 280 return ret; 281 } 282 283 #ifdef CONFIG_X86_64 284 static void __init init_gbpages(void) 285 { 286 if (direct_gbpages && cpu_has_gbpages) 287 printk(KERN_INFO "Using GB pages for direct mapping\n"); 288 else 289 direct_gbpages = 0; 290 } 291 #else 292 static inline void init_gbpages(void) 293 { 294 } 295 static void __init cleanup_highmap(void) 296 { 297 } 298 #endif 299 300 static void __init reserve_brk(void) 301 { 302 if (_brk_end > _brk_start) 303 memblock_reserve(__pa(_brk_start), 304 __pa(_brk_end) - __pa(_brk_start)); 305 306 /* Mark brk area as locked down and no longer taking any 307 new allocations */ 308 _brk_start = 0; 309 } 310 311 #ifdef CONFIG_BLK_DEV_INITRD 312 313 #define MAX_MAP_CHUNK (NR_FIX_BTMAPS << PAGE_SHIFT) 314 static void __init relocate_initrd(void) 315 { 316 /* Assume only end is not page aligned */ 317 u64 ramdisk_image = boot_params.hdr.ramdisk_image; 318 u64 ramdisk_size = boot_params.hdr.ramdisk_size; 319 u64 area_size = PAGE_ALIGN(ramdisk_size); 320 u64 end_of_lowmem = max_low_pfn_mapped << PAGE_SHIFT; 321 u64 ramdisk_here; 322 unsigned long slop, clen, mapaddr; 323 char *p, *q; 324 325 /* We need to move the initrd down into lowmem */ 326 ramdisk_here = memblock_find_in_range(0, end_of_lowmem, area_size, 327 PAGE_SIZE); 328 329 if (!ramdisk_here) 330 panic("Cannot find place for new RAMDISK of size %lld\n", 331 ramdisk_size); 332 333 /* Note: this includes all the lowmem currently occupied by 334 the initrd, we rely on that fact to keep the data intact. */ 335 memblock_reserve(ramdisk_here, area_size); 336 initrd_start = ramdisk_here + PAGE_OFFSET; 337 initrd_end = initrd_start + ramdisk_size; 338 printk(KERN_INFO "Allocated new RAMDISK: [mem %#010llx-%#010llx]\n", 339 ramdisk_here, ramdisk_here + ramdisk_size - 1); 340 341 q = (char *)initrd_start; 342 343 /* Copy any lowmem portion of the initrd */ 344 if (ramdisk_image < end_of_lowmem) { 345 clen = end_of_lowmem - ramdisk_image; 346 p = (char *)__va(ramdisk_image); 347 memcpy(q, p, clen); 348 q += clen; 349 ramdisk_image += clen; 350 ramdisk_size -= clen; 351 } 352 353 /* Copy the highmem portion of the initrd */ 354 while (ramdisk_size) { 355 slop = ramdisk_image & ~PAGE_MASK; 356 clen = ramdisk_size; 357 if (clen > MAX_MAP_CHUNK-slop) 358 clen = MAX_MAP_CHUNK-slop; 359 mapaddr = ramdisk_image & PAGE_MASK; 360 p = early_memremap(mapaddr, clen+slop); 361 memcpy(q, p+slop, clen); 362 early_iounmap(p, clen+slop); 363 q += clen; 364 ramdisk_image += clen; 365 ramdisk_size -= clen; 366 } 367 /* high pages is not converted by early_res_to_bootmem */ 368 ramdisk_image = boot_params.hdr.ramdisk_image; 369 ramdisk_size = boot_params.hdr.ramdisk_size; 370 printk(KERN_INFO "Move RAMDISK from [mem %#010llx-%#010llx] to" 371 " [mem %#010llx-%#010llx]\n", 372 ramdisk_image, ramdisk_image + ramdisk_size - 1, 373 ramdisk_here, ramdisk_here + ramdisk_size - 1); 374 } 375 376 static void __init reserve_initrd(void) 377 { 378 /* Assume only end is not page aligned */ 379 u64 ramdisk_image = boot_params.hdr.ramdisk_image; 380 u64 ramdisk_size = boot_params.hdr.ramdisk_size; 381 u64 ramdisk_end = PAGE_ALIGN(ramdisk_image + ramdisk_size); 382 u64 end_of_lowmem = max_low_pfn_mapped << PAGE_SHIFT; 383 384 if (!boot_params.hdr.type_of_loader || 385 !ramdisk_image || !ramdisk_size) 386 return; /* No initrd provided by bootloader */ 387 388 initrd_start = 0; 389 390 if (ramdisk_size >= (end_of_lowmem>>1)) { 391 panic("initrd too large to handle, " 392 "disabling initrd (%lld needed, %lld available)\n", 393 ramdisk_size, end_of_lowmem>>1); 394 } 395 396 printk(KERN_INFO "RAMDISK: [mem %#010llx-%#010llx]\n", ramdisk_image, 397 ramdisk_end - 1); 398 399 400 if (ramdisk_end <= end_of_lowmem) { 401 /* All in lowmem, easy case */ 402 /* 403 * don't need to reserve again, already reserved early 404 * in i386_start_kernel 405 */ 406 initrd_start = ramdisk_image + PAGE_OFFSET; 407 initrd_end = initrd_start + ramdisk_size; 408 return; 409 } 410 411 relocate_initrd(); 412 413 memblock_free(ramdisk_image, ramdisk_end - ramdisk_image); 414 } 415 #else 416 static void __init reserve_initrd(void) 417 { 418 } 419 #endif /* CONFIG_BLK_DEV_INITRD */ 420 421 static void __init parse_setup_data(void) 422 { 423 struct setup_data *data; 424 u64 pa_data; 425 426 if (boot_params.hdr.version < 0x0209) 427 return; 428 pa_data = boot_params.hdr.setup_data; 429 while (pa_data) { 430 u32 data_len, map_len; 431 432 map_len = max(PAGE_SIZE - (pa_data & ~PAGE_MASK), 433 (u64)sizeof(struct setup_data)); 434 data = early_memremap(pa_data, map_len); 435 data_len = data->len + sizeof(struct setup_data); 436 if (data_len > map_len) { 437 early_iounmap(data, map_len); 438 data = early_memremap(pa_data, data_len); 439 map_len = data_len; 440 } 441 442 switch (data->type) { 443 case SETUP_E820_EXT: 444 parse_e820_ext(data); 445 break; 446 case SETUP_DTB: 447 add_dtb(pa_data); 448 break; 449 default: 450 break; 451 } 452 pa_data = data->next; 453 early_iounmap(data, map_len); 454 } 455 } 456 457 static void __init e820_reserve_setup_data(void) 458 { 459 struct setup_data *data; 460 u64 pa_data; 461 int found = 0; 462 463 if (boot_params.hdr.version < 0x0209) 464 return; 465 pa_data = boot_params.hdr.setup_data; 466 while (pa_data) { 467 data = early_memremap(pa_data, sizeof(*data)); 468 e820_update_range(pa_data, sizeof(*data)+data->len, 469 E820_RAM, E820_RESERVED_KERN); 470 found = 1; 471 pa_data = data->next; 472 early_iounmap(data, sizeof(*data)); 473 } 474 if (!found) 475 return; 476 477 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); 478 memcpy(&e820_saved, &e820, sizeof(struct e820map)); 479 printk(KERN_INFO "extended physical RAM map:\n"); 480 e820_print_map("reserve setup_data"); 481 } 482 483 static void __init memblock_x86_reserve_range_setup_data(void) 484 { 485 struct setup_data *data; 486 u64 pa_data; 487 488 if (boot_params.hdr.version < 0x0209) 489 return; 490 pa_data = boot_params.hdr.setup_data; 491 while (pa_data) { 492 data = early_memremap(pa_data, sizeof(*data)); 493 memblock_reserve(pa_data, sizeof(*data) + data->len); 494 pa_data = data->next; 495 early_iounmap(data, sizeof(*data)); 496 } 497 } 498 499 /* 500 * --------- Crashkernel reservation ------------------------------ 501 */ 502 503 #ifdef CONFIG_KEXEC 504 505 /* 506 * Keep the crash kernel below this limit. On 32 bits earlier kernels 507 * would limit the kernel to the low 512 MiB due to mapping restrictions. 508 * On 64 bits, kexec-tools currently limits us to 896 MiB; increase this 509 * limit once kexec-tools are fixed. 510 */ 511 #ifdef CONFIG_X86_32 512 # define CRASH_KERNEL_ADDR_MAX (512 << 20) 513 #else 514 # define CRASH_KERNEL_ADDR_MAX (896 << 20) 515 #endif 516 517 static void __init reserve_crashkernel(void) 518 { 519 unsigned long long total_mem; 520 unsigned long long crash_size, crash_base; 521 int ret; 522 523 total_mem = memblock_phys_mem_size(); 524 525 ret = parse_crashkernel(boot_command_line, total_mem, 526 &crash_size, &crash_base); 527 if (ret != 0 || crash_size <= 0) 528 return; 529 530 /* 0 means: find the address automatically */ 531 if (crash_base <= 0) { 532 const unsigned long long alignment = 16<<20; /* 16M */ 533 534 /* 535 * kexec want bzImage is below CRASH_KERNEL_ADDR_MAX 536 */ 537 crash_base = memblock_find_in_range(alignment, 538 CRASH_KERNEL_ADDR_MAX, crash_size, alignment); 539 540 if (!crash_base) { 541 pr_info("crashkernel reservation failed - No suitable area found.\n"); 542 return; 543 } 544 } else { 545 unsigned long long start; 546 547 start = memblock_find_in_range(crash_base, 548 crash_base + crash_size, crash_size, 1<<20); 549 if (start != crash_base) { 550 pr_info("crashkernel reservation failed - memory is in use.\n"); 551 return; 552 } 553 } 554 memblock_reserve(crash_base, crash_size); 555 556 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB " 557 "for crashkernel (System RAM: %ldMB)\n", 558 (unsigned long)(crash_size >> 20), 559 (unsigned long)(crash_base >> 20), 560 (unsigned long)(total_mem >> 20)); 561 562 crashk_res.start = crash_base; 563 crashk_res.end = crash_base + crash_size - 1; 564 insert_resource(&iomem_resource, &crashk_res); 565 } 566 #else 567 static void __init reserve_crashkernel(void) 568 { 569 } 570 #endif 571 572 static struct resource standard_io_resources[] = { 573 { .name = "dma1", .start = 0x00, .end = 0x1f, 574 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 575 { .name = "pic1", .start = 0x20, .end = 0x21, 576 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 577 { .name = "timer0", .start = 0x40, .end = 0x43, 578 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 579 { .name = "timer1", .start = 0x50, .end = 0x53, 580 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 581 { .name = "keyboard", .start = 0x60, .end = 0x60, 582 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 583 { .name = "keyboard", .start = 0x64, .end = 0x64, 584 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 585 { .name = "dma page reg", .start = 0x80, .end = 0x8f, 586 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 587 { .name = "pic2", .start = 0xa0, .end = 0xa1, 588 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 589 { .name = "dma2", .start = 0xc0, .end = 0xdf, 590 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 591 { .name = "fpu", .start = 0xf0, .end = 0xff, 592 .flags = IORESOURCE_BUSY | IORESOURCE_IO } 593 }; 594 595 void __init reserve_standard_io_resources(void) 596 { 597 int i; 598 599 /* request I/O space for devices used on all i[345]86 PCs */ 600 for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++) 601 request_resource(&ioport_resource, &standard_io_resources[i]); 602 603 } 604 605 static __init void reserve_ibft_region(void) 606 { 607 unsigned long addr, size = 0; 608 609 addr = find_ibft_region(&size); 610 611 if (size) 612 memblock_reserve(addr, size); 613 } 614 615 static unsigned reserve_low = CONFIG_X86_RESERVE_LOW << 10; 616 617 static void __init trim_bios_range(void) 618 { 619 /* 620 * A special case is the first 4Kb of memory; 621 * This is a BIOS owned area, not kernel ram, but generally 622 * not listed as such in the E820 table. 623 * 624 * This typically reserves additional memory (64KiB by default) 625 * since some BIOSes are known to corrupt low memory. See the 626 * Kconfig help text for X86_RESERVE_LOW. 627 */ 628 e820_update_range(0, ALIGN(reserve_low, PAGE_SIZE), 629 E820_RAM, E820_RESERVED); 630 631 /* 632 * special case: Some BIOSen report the PC BIOS 633 * area (640->1Mb) as ram even though it is not. 634 * take them out. 635 */ 636 e820_remove_range(BIOS_BEGIN, BIOS_END - BIOS_BEGIN, E820_RAM, 1); 637 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); 638 } 639 640 static int __init parse_reservelow(char *p) 641 { 642 unsigned long long size; 643 644 if (!p) 645 return -EINVAL; 646 647 size = memparse(p, &p); 648 649 if (size < 4096) 650 size = 4096; 651 652 if (size > 640*1024) 653 size = 640*1024; 654 655 reserve_low = size; 656 657 return 0; 658 } 659 660 early_param("reservelow", parse_reservelow); 661 662 /* 663 * Determine if we were loaded by an EFI loader. If so, then we have also been 664 * passed the efi memmap, systab, etc., so we should use these data structures 665 * for initialization. Note, the efi init code path is determined by the 666 * global efi_enabled. This allows the same kernel image to be used on existing 667 * systems (with a traditional BIOS) as well as on EFI systems. 668 */ 669 /* 670 * setup_arch - architecture-specific boot-time initializations 671 * 672 * Note: On x86_64, fixmaps are ready for use even before this is called. 673 */ 674 675 void __init setup_arch(char **cmdline_p) 676 { 677 #ifdef CONFIG_X86_32 678 memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data)); 679 visws_early_detect(); 680 681 /* 682 * copy kernel address range established so far and switch 683 * to the proper swapper page table 684 */ 685 clone_pgd_range(swapper_pg_dir + KERNEL_PGD_BOUNDARY, 686 initial_page_table + KERNEL_PGD_BOUNDARY, 687 KERNEL_PGD_PTRS); 688 689 load_cr3(swapper_pg_dir); 690 __flush_tlb_all(); 691 #else 692 printk(KERN_INFO "Command line: %s\n", boot_command_line); 693 #endif 694 695 /* 696 * If we have OLPC OFW, we might end up relocating the fixmap due to 697 * reserve_top(), so do this before touching the ioremap area. 698 */ 699 olpc_ofw_detect(); 700 701 early_trap_init(); 702 early_cpu_init(); 703 early_ioremap_init(); 704 705 setup_olpc_ofw_pgd(); 706 707 ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev); 708 screen_info = boot_params.screen_info; 709 edid_info = boot_params.edid_info; 710 #ifdef CONFIG_X86_32 711 apm_info.bios = boot_params.apm_bios_info; 712 ist_info = boot_params.ist_info; 713 if (boot_params.sys_desc_table.length != 0) { 714 machine_id = boot_params.sys_desc_table.table[0]; 715 machine_submodel_id = boot_params.sys_desc_table.table[1]; 716 BIOS_revision = boot_params.sys_desc_table.table[2]; 717 } 718 #endif 719 saved_video_mode = boot_params.hdr.vid_mode; 720 bootloader_type = boot_params.hdr.type_of_loader; 721 if ((bootloader_type >> 4) == 0xe) { 722 bootloader_type &= 0xf; 723 bootloader_type |= (boot_params.hdr.ext_loader_type+0x10) << 4; 724 } 725 bootloader_version = bootloader_type & 0xf; 726 bootloader_version |= boot_params.hdr.ext_loader_ver << 4; 727 728 #ifdef CONFIG_BLK_DEV_RAM 729 rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK; 730 rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0); 731 rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0); 732 #endif 733 #ifdef CONFIG_EFI 734 if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature, 735 "EL32", 4)) { 736 efi_enabled = 1; 737 efi_64bit = false; 738 } else if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature, 739 "EL64", 4)) { 740 efi_enabled = 1; 741 efi_64bit = true; 742 } 743 if (efi_enabled && efi_memblock_x86_reserve_range()) 744 efi_enabled = 0; 745 #endif 746 747 x86_init.oem.arch_setup(); 748 749 iomem_resource.end = (1ULL << boot_cpu_data.x86_phys_bits) - 1; 750 setup_memory_map(); 751 parse_setup_data(); 752 /* update the e820_saved too */ 753 e820_reserve_setup_data(); 754 755 copy_edd(); 756 757 if (!boot_params.hdr.root_flags) 758 root_mountflags &= ~MS_RDONLY; 759 init_mm.start_code = (unsigned long) _text; 760 init_mm.end_code = (unsigned long) _etext; 761 init_mm.end_data = (unsigned long) _edata; 762 init_mm.brk = _brk_end; 763 764 code_resource.start = virt_to_phys(_text); 765 code_resource.end = virt_to_phys(_etext)-1; 766 data_resource.start = virt_to_phys(_etext); 767 data_resource.end = virt_to_phys(_edata)-1; 768 bss_resource.start = virt_to_phys(&__bss_start); 769 bss_resource.end = virt_to_phys(&__bss_stop)-1; 770 771 #ifdef CONFIG_CMDLINE_BOOL 772 #ifdef CONFIG_CMDLINE_OVERRIDE 773 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE); 774 #else 775 if (builtin_cmdline[0]) { 776 /* append boot loader cmdline to builtin */ 777 strlcat(builtin_cmdline, " ", COMMAND_LINE_SIZE); 778 strlcat(builtin_cmdline, boot_command_line, COMMAND_LINE_SIZE); 779 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE); 780 } 781 #endif 782 #endif 783 784 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE); 785 *cmdline_p = command_line; 786 787 /* 788 * x86_configure_nx() is called before parse_early_param() to detect 789 * whether hardware doesn't support NX (so that the early EHCI debug 790 * console setup can safely call set_fixmap()). It may then be called 791 * again from within noexec_setup() during parsing early parameters 792 * to honor the respective command line option. 793 */ 794 x86_configure_nx(); 795 796 parse_early_param(); 797 798 x86_report_nx(); 799 800 /* after early param, so could get panic from serial */ 801 memblock_x86_reserve_range_setup_data(); 802 803 if (acpi_mps_check()) { 804 #ifdef CONFIG_X86_LOCAL_APIC 805 disable_apic = 1; 806 #endif 807 setup_clear_cpu_cap(X86_FEATURE_APIC); 808 } 809 810 #ifdef CONFIG_PCI 811 if (pci_early_dump_regs) 812 early_dump_pci_devices(); 813 #endif 814 815 finish_e820_parsing(); 816 817 if (efi_enabled) 818 efi_init(); 819 820 dmi_scan_machine(); 821 822 /* 823 * VMware detection requires dmi to be available, so this 824 * needs to be done after dmi_scan_machine, for the BP. 825 */ 826 init_hypervisor_platform(); 827 828 x86_init.resources.probe_roms(); 829 830 /* after parse_early_param, so could debug it */ 831 insert_resource(&iomem_resource, &code_resource); 832 insert_resource(&iomem_resource, &data_resource); 833 insert_resource(&iomem_resource, &bss_resource); 834 835 trim_bios_range(); 836 #ifdef CONFIG_X86_32 837 if (ppro_with_ram_bug()) { 838 e820_update_range(0x70000000ULL, 0x40000ULL, E820_RAM, 839 E820_RESERVED); 840 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); 841 printk(KERN_INFO "fixed physical RAM map:\n"); 842 e820_print_map("bad_ppro"); 843 } 844 #else 845 early_gart_iommu_check(); 846 #endif 847 848 /* 849 * partially used pages are not usable - thus 850 * we are rounding upwards: 851 */ 852 max_pfn = e820_end_of_ram_pfn(); 853 854 /* update e820 for memory not covered by WB MTRRs */ 855 mtrr_bp_init(); 856 if (mtrr_trim_uncached_memory(max_pfn)) 857 max_pfn = e820_end_of_ram_pfn(); 858 859 #ifdef CONFIG_X86_32 860 /* max_low_pfn get updated here */ 861 find_low_pfn_range(); 862 #else 863 num_physpages = max_pfn; 864 865 check_x2apic(); 866 867 /* How many end-of-memory variables you have, grandma! */ 868 /* need this before calling reserve_initrd */ 869 if (max_pfn > (1UL<<(32 - PAGE_SHIFT))) 870 max_low_pfn = e820_end_of_low_ram_pfn(); 871 else 872 max_low_pfn = max_pfn; 873 874 high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1; 875 #endif 876 877 /* 878 * Find and reserve possible boot-time SMP configuration: 879 */ 880 find_smp_config(); 881 882 reserve_ibft_region(); 883 884 /* 885 * Need to conclude brk, before memblock_x86_fill() 886 * it could use memblock_find_in_range, could overlap with 887 * brk area. 888 */ 889 reserve_brk(); 890 891 cleanup_highmap(); 892 893 memblock.current_limit = get_max_mapped(); 894 memblock_x86_fill(); 895 896 /* 897 * The EFI specification says that boot service code won't be called 898 * after ExitBootServices(). This is, in fact, a lie. 899 */ 900 if (efi_enabled) 901 efi_reserve_boot_services(); 902 903 /* preallocate 4k for mptable mpc */ 904 early_reserve_e820_mpc_new(); 905 906 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION 907 setup_bios_corruption_check(); 908 #endif 909 910 printk(KERN_DEBUG "initial memory mapped: [mem 0x00000000-%#010lx]\n", 911 (max_pfn_mapped<<PAGE_SHIFT) - 1); 912 913 setup_real_mode(); 914 915 init_gbpages(); 916 917 /* max_pfn_mapped is updated here */ 918 max_low_pfn_mapped = init_memory_mapping(0, max_low_pfn<<PAGE_SHIFT); 919 max_pfn_mapped = max_low_pfn_mapped; 920 921 #ifdef CONFIG_X86_64 922 if (max_pfn > max_low_pfn) { 923 int i; 924 for (i = 0; i < e820.nr_map; i++) { 925 struct e820entry *ei = &e820.map[i]; 926 927 if (ei->addr + ei->size <= 1UL << 32) 928 continue; 929 930 if (ei->type == E820_RESERVED) 931 continue; 932 933 max_pfn_mapped = init_memory_mapping( 934 ei->addr < 1UL << 32 ? 1UL << 32 : ei->addr, 935 ei->addr + ei->size); 936 } 937 938 /* can we preseve max_low_pfn ?*/ 939 max_low_pfn = max_pfn; 940 } 941 #endif 942 memblock.current_limit = get_max_mapped(); 943 dma_contiguous_reserve(0); 944 945 /* 946 * NOTE: On x86-32, only from this point on, fixmaps are ready for use. 947 */ 948 949 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT 950 if (init_ohci1394_dma_early) 951 init_ohci1394_dma_on_all_controllers(); 952 #endif 953 /* Allocate bigger log buffer */ 954 setup_log_buf(1); 955 956 reserve_initrd(); 957 958 reserve_crashkernel(); 959 960 vsmp_init(); 961 962 io_delay_init(); 963 964 /* 965 * Parse the ACPI tables for possible boot-time SMP configuration. 966 */ 967 acpi_boot_table_init(); 968 969 early_acpi_boot_init(); 970 971 initmem_init(); 972 memblock_find_dma_reserve(); 973 974 #ifdef CONFIG_KVM_GUEST 975 kvmclock_init(); 976 #endif 977 978 x86_init.paging.pagetable_init(); 979 980 if (boot_cpu_data.cpuid_level >= 0) { 981 /* A CPU has %cr4 if and only if it has CPUID */ 982 mmu_cr4_features = read_cr4(); 983 if (trampoline_cr4_features) 984 *trampoline_cr4_features = mmu_cr4_features; 985 } 986 987 #ifdef CONFIG_X86_32 988 /* sync back kernel address range */ 989 clone_pgd_range(initial_page_table + KERNEL_PGD_BOUNDARY, 990 swapper_pg_dir + KERNEL_PGD_BOUNDARY, 991 KERNEL_PGD_PTRS); 992 #endif 993 994 tboot_probe(); 995 996 #ifdef CONFIG_X86_64 997 map_vsyscall(); 998 #endif 999 1000 generic_apic_probe(); 1001 1002 early_quirks(); 1003 1004 /* 1005 * Read APIC and some other early information from ACPI tables. 1006 */ 1007 acpi_boot_init(); 1008 sfi_init(); 1009 x86_dtb_init(); 1010 1011 /* 1012 * get boot-time SMP configuration: 1013 */ 1014 if (smp_found_config) 1015 get_smp_config(); 1016 1017 prefill_possible_map(); 1018 1019 init_cpu_to_node(); 1020 1021 init_apic_mappings(); 1022 if (x86_io_apic_ops.init) 1023 x86_io_apic_ops.init(); 1024 1025 kvm_guest_init(); 1026 1027 e820_reserve_resources(); 1028 e820_mark_nosave_regions(max_low_pfn); 1029 1030 x86_init.resources.reserve_resources(); 1031 1032 e820_setup_gap(); 1033 1034 #ifdef CONFIG_VT 1035 #if defined(CONFIG_VGA_CONSOLE) 1036 if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY)) 1037 conswitchp = &vga_con; 1038 #elif defined(CONFIG_DUMMY_CONSOLE) 1039 conswitchp = &dummy_con; 1040 #endif 1041 #endif 1042 x86_init.oem.banner(); 1043 1044 x86_init.timers.wallclock_init(); 1045 1046 mcheck_init(); 1047 1048 arch_init_ideal_nops(); 1049 1050 register_refined_jiffies(CLOCK_TICK_RATE); 1051 } 1052 1053 #ifdef CONFIG_X86_32 1054 1055 static struct resource video_ram_resource = { 1056 .name = "Video RAM area", 1057 .start = 0xa0000, 1058 .end = 0xbffff, 1059 .flags = IORESOURCE_BUSY | IORESOURCE_MEM 1060 }; 1061 1062 void __init i386_reserve_resources(void) 1063 { 1064 request_resource(&iomem_resource, &video_ram_resource); 1065 reserve_standard_io_resources(); 1066 } 1067 1068 #endif /* CONFIG_X86_32 */ 1069