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 72 #include <video/edid.h> 73 74 #include <asm/mtrr.h> 75 #include <asm/apic.h> 76 #include <asm/realmode.h> 77 #include <asm/e820.h> 78 #include <asm/mpspec.h> 79 #include <asm/setup.h> 80 #include <asm/efi.h> 81 #include <asm/timer.h> 82 #include <asm/i8259.h> 83 #include <asm/sections.h> 84 #include <asm/dmi.h> 85 #include <asm/io_apic.h> 86 #include <asm/ist.h> 87 #include <asm/setup_arch.h> 88 #include <asm/bios_ebda.h> 89 #include <asm/cacheflush.h> 90 #include <asm/processor.h> 91 #include <asm/bugs.h> 92 93 #include <asm/vsyscall.h> 94 #include <asm/cpu.h> 95 #include <asm/desc.h> 96 #include <asm/dma.h> 97 #include <asm/iommu.h> 98 #include <asm/gart.h> 99 #include <asm/mmu_context.h> 100 #include <asm/proto.h> 101 102 #include <asm/paravirt.h> 103 #include <asm/hypervisor.h> 104 #include <asm/olpc_ofw.h> 105 106 #include <asm/percpu.h> 107 #include <asm/topology.h> 108 #include <asm/apicdef.h> 109 #include <asm/amd_nb.h> 110 #ifdef CONFIG_X86_64 111 #include <asm/numa_64.h> 112 #endif 113 #include <asm/mce.h> 114 #include <asm/alternative.h> 115 #include <asm/prom.h> 116 117 /* 118 * end_pfn only includes RAM, while max_pfn_mapped includes all e820 entries. 119 * The direct mapping extends to max_pfn_mapped, so that we can directly access 120 * apertures, ACPI and other tables without having to play with fixmaps. 121 */ 122 unsigned long max_low_pfn_mapped; 123 unsigned long max_pfn_mapped; 124 125 #ifdef CONFIG_DMI 126 RESERVE_BRK(dmi_alloc, 65536); 127 #endif 128 129 130 static __initdata unsigned long _brk_start = (unsigned long)__brk_base; 131 unsigned long _brk_end = (unsigned long)__brk_base; 132 133 #ifdef CONFIG_X86_64 134 int default_cpu_present_to_apicid(int mps_cpu) 135 { 136 return __default_cpu_present_to_apicid(mps_cpu); 137 } 138 139 int default_check_phys_apicid_present(int phys_apicid) 140 { 141 return __default_check_phys_apicid_present(phys_apicid); 142 } 143 #endif 144 145 #ifndef CONFIG_DEBUG_BOOT_PARAMS 146 struct boot_params __initdata boot_params; 147 #else 148 struct boot_params boot_params; 149 #endif 150 151 /* 152 * Machine setup.. 153 */ 154 static struct resource data_resource = { 155 .name = "Kernel data", 156 .start = 0, 157 .end = 0, 158 .flags = IORESOURCE_BUSY | IORESOURCE_MEM 159 }; 160 161 static struct resource code_resource = { 162 .name = "Kernel code", 163 .start = 0, 164 .end = 0, 165 .flags = IORESOURCE_BUSY | IORESOURCE_MEM 166 }; 167 168 static struct resource bss_resource = { 169 .name = "Kernel bss", 170 .start = 0, 171 .end = 0, 172 .flags = IORESOURCE_BUSY | IORESOURCE_MEM 173 }; 174 175 176 #ifdef CONFIG_X86_32 177 /* cpu data as detected by the assembly code in head.S */ 178 struct cpuinfo_x86 new_cpu_data __cpuinitdata = {0, 0, 0, 0, -1, 1, 0, 0, -1}; 179 /* common cpu data for all cpus */ 180 struct cpuinfo_x86 boot_cpu_data __read_mostly = {0, 0, 0, 0, -1, 1, 0, 0, -1}; 181 EXPORT_SYMBOL(boot_cpu_data); 182 183 unsigned int def_to_bigsmp; 184 185 /* for MCA, but anyone else can use it if they want */ 186 unsigned int machine_id; 187 unsigned int machine_submodel_id; 188 unsigned int BIOS_revision; 189 190 struct apm_info apm_info; 191 EXPORT_SYMBOL(apm_info); 192 193 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \ 194 defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE) 195 struct ist_info ist_info; 196 EXPORT_SYMBOL(ist_info); 197 #else 198 struct ist_info ist_info; 199 #endif 200 201 #else 202 struct cpuinfo_x86 boot_cpu_data __read_mostly = { 203 .x86_phys_bits = MAX_PHYSMEM_BITS, 204 }; 205 EXPORT_SYMBOL(boot_cpu_data); 206 #endif 207 208 209 #if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64) 210 unsigned long mmu_cr4_features; 211 #else 212 unsigned long mmu_cr4_features = X86_CR4_PAE; 213 #endif 214 215 /* Boot loader ID and version as integers, for the benefit of proc_dointvec */ 216 int bootloader_type, bootloader_version; 217 218 /* 219 * Setup options 220 */ 221 struct screen_info screen_info; 222 EXPORT_SYMBOL(screen_info); 223 struct edid_info edid_info; 224 EXPORT_SYMBOL_GPL(edid_info); 225 226 extern int root_mountflags; 227 228 unsigned long saved_video_mode; 229 230 #define RAMDISK_IMAGE_START_MASK 0x07FF 231 #define RAMDISK_PROMPT_FLAG 0x8000 232 #define RAMDISK_LOAD_FLAG 0x4000 233 234 static char __initdata command_line[COMMAND_LINE_SIZE]; 235 #ifdef CONFIG_CMDLINE_BOOL 236 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE; 237 #endif 238 239 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE) 240 struct edd edd; 241 #ifdef CONFIG_EDD_MODULE 242 EXPORT_SYMBOL(edd); 243 #endif 244 /** 245 * copy_edd() - Copy the BIOS EDD information 246 * from boot_params into a safe place. 247 * 248 */ 249 static inline void __init copy_edd(void) 250 { 251 memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer, 252 sizeof(edd.mbr_signature)); 253 memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info)); 254 edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries; 255 edd.edd_info_nr = boot_params.eddbuf_entries; 256 } 257 #else 258 static inline void __init copy_edd(void) 259 { 260 } 261 #endif 262 263 void * __init extend_brk(size_t size, size_t align) 264 { 265 size_t mask = align - 1; 266 void *ret; 267 268 BUG_ON(_brk_start == 0); 269 BUG_ON(align & mask); 270 271 _brk_end = (_brk_end + mask) & ~mask; 272 BUG_ON((char *)(_brk_end + size) > __brk_limit); 273 274 ret = (void *)_brk_end; 275 _brk_end += size; 276 277 memset(ret, 0, size); 278 279 return ret; 280 } 281 282 #ifdef CONFIG_X86_64 283 static void __init init_gbpages(void) 284 { 285 if (direct_gbpages && cpu_has_gbpages) 286 printk(KERN_INFO "Using GB pages for direct mapping\n"); 287 else 288 direct_gbpages = 0; 289 } 290 #else 291 static inline void init_gbpages(void) 292 { 293 } 294 static void __init cleanup_highmap(void) 295 { 296 } 297 #endif 298 299 static void __init reserve_brk(void) 300 { 301 if (_brk_end > _brk_start) 302 memblock_reserve(__pa(_brk_start), 303 __pa(_brk_end) - __pa(_brk_start)); 304 305 /* Mark brk area as locked down and no longer taking any 306 new allocations */ 307 _brk_start = 0; 308 } 309 310 #ifdef CONFIG_BLK_DEV_INITRD 311 312 #define MAX_MAP_CHUNK (NR_FIX_BTMAPS << PAGE_SHIFT) 313 static void __init relocate_initrd(void) 314 { 315 /* Assume only end is not page aligned */ 316 u64 ramdisk_image = boot_params.hdr.ramdisk_image; 317 u64 ramdisk_size = boot_params.hdr.ramdisk_size; 318 u64 area_size = PAGE_ALIGN(ramdisk_size); 319 u64 end_of_lowmem = max_low_pfn_mapped << PAGE_SHIFT; 320 u64 ramdisk_here; 321 unsigned long slop, clen, mapaddr; 322 char *p, *q; 323 324 /* We need to move the initrd down into lowmem */ 325 ramdisk_here = memblock_find_in_range(0, end_of_lowmem, area_size, 326 PAGE_SIZE); 327 328 if (!ramdisk_here) 329 panic("Cannot find place for new RAMDISK of size %lld\n", 330 ramdisk_size); 331 332 /* Note: this includes all the lowmem currently occupied by 333 the initrd, we rely on that fact to keep the data intact. */ 334 memblock_reserve(ramdisk_here, area_size); 335 initrd_start = ramdisk_here + PAGE_OFFSET; 336 initrd_end = initrd_start + ramdisk_size; 337 printk(KERN_INFO "Allocated new RAMDISK: [mem %#010llx-%#010llx]\n", 338 ramdisk_here, ramdisk_here + ramdisk_size - 1); 339 340 q = (char *)initrd_start; 341 342 /* Copy any lowmem portion of the initrd */ 343 if (ramdisk_image < end_of_lowmem) { 344 clen = end_of_lowmem - ramdisk_image; 345 p = (char *)__va(ramdisk_image); 346 memcpy(q, p, clen); 347 q += clen; 348 ramdisk_image += clen; 349 ramdisk_size -= clen; 350 } 351 352 /* Copy the highmem portion of the initrd */ 353 while (ramdisk_size) { 354 slop = ramdisk_image & ~PAGE_MASK; 355 clen = ramdisk_size; 356 if (clen > MAX_MAP_CHUNK-slop) 357 clen = MAX_MAP_CHUNK-slop; 358 mapaddr = ramdisk_image & PAGE_MASK; 359 p = early_memremap(mapaddr, clen+slop); 360 memcpy(q, p+slop, clen); 361 early_iounmap(p, clen+slop); 362 q += clen; 363 ramdisk_image += clen; 364 ramdisk_size -= clen; 365 } 366 /* high pages is not converted by early_res_to_bootmem */ 367 ramdisk_image = boot_params.hdr.ramdisk_image; 368 ramdisk_size = boot_params.hdr.ramdisk_size; 369 printk(KERN_INFO "Move RAMDISK from [mem %#010llx-%#010llx] to" 370 " [mem %#010llx-%#010llx]\n", 371 ramdisk_image, ramdisk_image + ramdisk_size - 1, 372 ramdisk_here, ramdisk_here + ramdisk_size - 1); 373 } 374 375 static void __init reserve_initrd(void) 376 { 377 /* Assume only end is not page aligned */ 378 u64 ramdisk_image = boot_params.hdr.ramdisk_image; 379 u64 ramdisk_size = boot_params.hdr.ramdisk_size; 380 u64 ramdisk_end = PAGE_ALIGN(ramdisk_image + ramdisk_size); 381 u64 end_of_lowmem = max_low_pfn_mapped << PAGE_SHIFT; 382 383 if (!boot_params.hdr.type_of_loader || 384 !ramdisk_image || !ramdisk_size) 385 return; /* No initrd provided by bootloader */ 386 387 initrd_start = 0; 388 389 if (ramdisk_size >= (end_of_lowmem>>1)) { 390 panic("initrd too large to handle, " 391 "disabling initrd (%lld needed, %lld available)\n", 392 ramdisk_size, end_of_lowmem>>1); 393 } 394 395 printk(KERN_INFO "RAMDISK: [mem %#010llx-%#010llx]\n", ramdisk_image, 396 ramdisk_end - 1); 397 398 399 if (ramdisk_end <= end_of_lowmem) { 400 /* All in lowmem, easy case */ 401 /* 402 * don't need to reserve again, already reserved early 403 * in i386_start_kernel 404 */ 405 initrd_start = ramdisk_image + PAGE_OFFSET; 406 initrd_end = initrd_start + ramdisk_size; 407 return; 408 } 409 410 relocate_initrd(); 411 412 memblock_free(ramdisk_image, ramdisk_end - ramdisk_image); 413 } 414 #else 415 static void __init reserve_initrd(void) 416 { 417 } 418 #endif /* CONFIG_BLK_DEV_INITRD */ 419 420 static void __init parse_setup_data(void) 421 { 422 struct setup_data *data; 423 u64 pa_data; 424 425 if (boot_params.hdr.version < 0x0209) 426 return; 427 pa_data = boot_params.hdr.setup_data; 428 while (pa_data) { 429 u32 data_len, map_len; 430 431 map_len = max(PAGE_SIZE - (pa_data & ~PAGE_MASK), 432 (u64)sizeof(struct setup_data)); 433 data = early_memremap(pa_data, map_len); 434 data_len = data->len + sizeof(struct setup_data); 435 if (data_len > map_len) { 436 early_iounmap(data, map_len); 437 data = early_memremap(pa_data, data_len); 438 map_len = data_len; 439 } 440 441 switch (data->type) { 442 case SETUP_E820_EXT: 443 parse_e820_ext(data); 444 break; 445 case SETUP_DTB: 446 add_dtb(pa_data); 447 break; 448 default: 449 break; 450 } 451 pa_data = data->next; 452 early_iounmap(data, map_len); 453 } 454 } 455 456 static void __init e820_reserve_setup_data(void) 457 { 458 struct setup_data *data; 459 u64 pa_data; 460 int found = 0; 461 462 if (boot_params.hdr.version < 0x0209) 463 return; 464 pa_data = boot_params.hdr.setup_data; 465 while (pa_data) { 466 data = early_memremap(pa_data, sizeof(*data)); 467 e820_update_range(pa_data, sizeof(*data)+data->len, 468 E820_RAM, E820_RESERVED_KERN); 469 found = 1; 470 pa_data = data->next; 471 early_iounmap(data, sizeof(*data)); 472 } 473 if (!found) 474 return; 475 476 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); 477 memcpy(&e820_saved, &e820, sizeof(struct e820map)); 478 printk(KERN_INFO "extended physical RAM map:\n"); 479 e820_print_map("reserve setup_data"); 480 } 481 482 static void __init memblock_x86_reserve_range_setup_data(void) 483 { 484 struct setup_data *data; 485 u64 pa_data; 486 487 if (boot_params.hdr.version < 0x0209) 488 return; 489 pa_data = boot_params.hdr.setup_data; 490 while (pa_data) { 491 data = early_memremap(pa_data, sizeof(*data)); 492 memblock_reserve(pa_data, sizeof(*data) + data->len); 493 pa_data = data->next; 494 early_iounmap(data, sizeof(*data)); 495 } 496 } 497 498 /* 499 * --------- Crashkernel reservation ------------------------------ 500 */ 501 502 #ifdef CONFIG_KEXEC 503 504 /* 505 * Keep the crash kernel below this limit. On 32 bits earlier kernels 506 * would limit the kernel to the low 512 MiB due to mapping restrictions. 507 * On 64 bits, kexec-tools currently limits us to 896 MiB; increase this 508 * limit once kexec-tools are fixed. 509 */ 510 #ifdef CONFIG_X86_32 511 # define CRASH_KERNEL_ADDR_MAX (512 << 20) 512 #else 513 # define CRASH_KERNEL_ADDR_MAX (896 << 20) 514 #endif 515 516 static void __init reserve_crashkernel(void) 517 { 518 unsigned long long total_mem; 519 unsigned long long crash_size, crash_base; 520 int ret; 521 522 total_mem = memblock_phys_mem_size(); 523 524 ret = parse_crashkernel(boot_command_line, total_mem, 525 &crash_size, &crash_base); 526 if (ret != 0 || crash_size <= 0) 527 return; 528 529 /* 0 means: find the address automatically */ 530 if (crash_base <= 0) { 531 const unsigned long long alignment = 16<<20; /* 16M */ 532 533 /* 534 * kexec want bzImage is below CRASH_KERNEL_ADDR_MAX 535 */ 536 crash_base = memblock_find_in_range(alignment, 537 CRASH_KERNEL_ADDR_MAX, crash_size, alignment); 538 539 if (!crash_base) { 540 pr_info("crashkernel reservation failed - No suitable area found.\n"); 541 return; 542 } 543 } else { 544 unsigned long long start; 545 546 start = memblock_find_in_range(crash_base, 547 crash_base + crash_size, crash_size, 1<<20); 548 if (start != crash_base) { 549 pr_info("crashkernel reservation failed - memory is in use.\n"); 550 return; 551 } 552 } 553 memblock_reserve(crash_base, crash_size); 554 555 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB " 556 "for crashkernel (System RAM: %ldMB)\n", 557 (unsigned long)(crash_size >> 20), 558 (unsigned long)(crash_base >> 20), 559 (unsigned long)(total_mem >> 20)); 560 561 crashk_res.start = crash_base; 562 crashk_res.end = crash_base + crash_size - 1; 563 insert_resource(&iomem_resource, &crashk_res); 564 } 565 #else 566 static void __init reserve_crashkernel(void) 567 { 568 } 569 #endif 570 571 static struct resource standard_io_resources[] = { 572 { .name = "dma1", .start = 0x00, .end = 0x1f, 573 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 574 { .name = "pic1", .start = 0x20, .end = 0x21, 575 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 576 { .name = "timer0", .start = 0x40, .end = 0x43, 577 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 578 { .name = "timer1", .start = 0x50, .end = 0x53, 579 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 580 { .name = "keyboard", .start = 0x60, .end = 0x60, 581 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 582 { .name = "keyboard", .start = 0x64, .end = 0x64, 583 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 584 { .name = "dma page reg", .start = 0x80, .end = 0x8f, 585 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 586 { .name = "pic2", .start = 0xa0, .end = 0xa1, 587 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 588 { .name = "dma2", .start = 0xc0, .end = 0xdf, 589 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 590 { .name = "fpu", .start = 0xf0, .end = 0xff, 591 .flags = IORESOURCE_BUSY | IORESOURCE_IO } 592 }; 593 594 void __init reserve_standard_io_resources(void) 595 { 596 int i; 597 598 /* request I/O space for devices used on all i[345]86 PCs */ 599 for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++) 600 request_resource(&ioport_resource, &standard_io_resources[i]); 601 602 } 603 604 static __init void reserve_ibft_region(void) 605 { 606 unsigned long addr, size = 0; 607 608 addr = find_ibft_region(&size); 609 610 if (size) 611 memblock_reserve(addr, size); 612 } 613 614 static unsigned reserve_low = CONFIG_X86_RESERVE_LOW << 10; 615 616 static void __init trim_bios_range(void) 617 { 618 /* 619 * A special case is the first 4Kb of memory; 620 * This is a BIOS owned area, not kernel ram, but generally 621 * not listed as such in the E820 table. 622 * 623 * This typically reserves additional memory (64KiB by default) 624 * since some BIOSes are known to corrupt low memory. See the 625 * Kconfig help text for X86_RESERVE_LOW. 626 */ 627 e820_update_range(0, ALIGN(reserve_low, PAGE_SIZE), 628 E820_RAM, E820_RESERVED); 629 630 /* 631 * special case: Some BIOSen report the PC BIOS 632 * area (640->1Mb) as ram even though it is not. 633 * take them out. 634 */ 635 e820_remove_range(BIOS_BEGIN, BIOS_END - BIOS_BEGIN, E820_RAM, 1); 636 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); 637 } 638 639 static int __init parse_reservelow(char *p) 640 { 641 unsigned long long size; 642 643 if (!p) 644 return -EINVAL; 645 646 size = memparse(p, &p); 647 648 if (size < 4096) 649 size = 4096; 650 651 if (size > 640*1024) 652 size = 640*1024; 653 654 reserve_low = size; 655 656 return 0; 657 } 658 659 early_param("reservelow", parse_reservelow); 660 661 /* 662 * Determine if we were loaded by an EFI loader. If so, then we have also been 663 * passed the efi memmap, systab, etc., so we should use these data structures 664 * for initialization. Note, the efi init code path is determined by the 665 * global efi_enabled. This allows the same kernel image to be used on existing 666 * systems (with a traditional BIOS) as well as on EFI systems. 667 */ 668 /* 669 * setup_arch - architecture-specific boot-time initializations 670 * 671 * Note: On x86_64, fixmaps are ready for use even before this is called. 672 */ 673 674 void __init setup_arch(char **cmdline_p) 675 { 676 #ifdef CONFIG_X86_32 677 memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data)); 678 visws_early_detect(); 679 680 /* 681 * copy kernel address range established so far and switch 682 * to the proper swapper page table 683 */ 684 clone_pgd_range(swapper_pg_dir + KERNEL_PGD_BOUNDARY, 685 initial_page_table + KERNEL_PGD_BOUNDARY, 686 KERNEL_PGD_PTRS); 687 688 load_cr3(swapper_pg_dir); 689 __flush_tlb_all(); 690 #else 691 printk(KERN_INFO "Command line: %s\n", boot_command_line); 692 #endif 693 694 /* 695 * If we have OLPC OFW, we might end up relocating the fixmap due to 696 * reserve_top(), so do this before touching the ioremap area. 697 */ 698 olpc_ofw_detect(); 699 700 early_trap_init(); 701 early_cpu_init(); 702 early_ioremap_init(); 703 704 setup_olpc_ofw_pgd(); 705 706 ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev); 707 screen_info = boot_params.screen_info; 708 edid_info = boot_params.edid_info; 709 #ifdef CONFIG_X86_32 710 apm_info.bios = boot_params.apm_bios_info; 711 ist_info = boot_params.ist_info; 712 if (boot_params.sys_desc_table.length != 0) { 713 machine_id = boot_params.sys_desc_table.table[0]; 714 machine_submodel_id = boot_params.sys_desc_table.table[1]; 715 BIOS_revision = boot_params.sys_desc_table.table[2]; 716 } 717 #endif 718 saved_video_mode = boot_params.hdr.vid_mode; 719 bootloader_type = boot_params.hdr.type_of_loader; 720 if ((bootloader_type >> 4) == 0xe) { 721 bootloader_type &= 0xf; 722 bootloader_type |= (boot_params.hdr.ext_loader_type+0x10) << 4; 723 } 724 bootloader_version = bootloader_type & 0xf; 725 bootloader_version |= boot_params.hdr.ext_loader_ver << 4; 726 727 #ifdef CONFIG_BLK_DEV_RAM 728 rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK; 729 rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0); 730 rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0); 731 #endif 732 #ifdef CONFIG_EFI 733 if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature, 734 "EL32", 4)) { 735 efi_enabled = 1; 736 efi_64bit = false; 737 } else if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature, 738 "EL64", 4)) { 739 efi_enabled = 1; 740 efi_64bit = true; 741 } 742 if (efi_enabled && efi_memblock_x86_reserve_range()) 743 efi_enabled = 0; 744 #endif 745 746 x86_init.oem.arch_setup(); 747 748 iomem_resource.end = (1ULL << boot_cpu_data.x86_phys_bits) - 1; 749 setup_memory_map(); 750 parse_setup_data(); 751 /* update the e820_saved too */ 752 e820_reserve_setup_data(); 753 754 copy_edd(); 755 756 if (!boot_params.hdr.root_flags) 757 root_mountflags &= ~MS_RDONLY; 758 init_mm.start_code = (unsigned long) _text; 759 init_mm.end_code = (unsigned long) _etext; 760 init_mm.end_data = (unsigned long) _edata; 761 init_mm.brk = _brk_end; 762 763 code_resource.start = virt_to_phys(_text); 764 code_resource.end = virt_to_phys(_etext)-1; 765 data_resource.start = virt_to_phys(_etext); 766 data_resource.end = virt_to_phys(_edata)-1; 767 bss_resource.start = virt_to_phys(&__bss_start); 768 bss_resource.end = virt_to_phys(&__bss_stop)-1; 769 770 #ifdef CONFIG_CMDLINE_BOOL 771 #ifdef CONFIG_CMDLINE_OVERRIDE 772 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE); 773 #else 774 if (builtin_cmdline[0]) { 775 /* append boot loader cmdline to builtin */ 776 strlcat(builtin_cmdline, " ", COMMAND_LINE_SIZE); 777 strlcat(builtin_cmdline, boot_command_line, COMMAND_LINE_SIZE); 778 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE); 779 } 780 #endif 781 #endif 782 783 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE); 784 *cmdline_p = command_line; 785 786 /* 787 * x86_configure_nx() is called before parse_early_param() to detect 788 * whether hardware doesn't support NX (so that the early EHCI debug 789 * console setup can safely call set_fixmap()). It may then be called 790 * again from within noexec_setup() during parsing early parameters 791 * to honor the respective command line option. 792 */ 793 x86_configure_nx(); 794 795 parse_early_param(); 796 797 x86_report_nx(); 798 799 /* after early param, so could get panic from serial */ 800 memblock_x86_reserve_range_setup_data(); 801 802 if (acpi_mps_check()) { 803 #ifdef CONFIG_X86_LOCAL_APIC 804 disable_apic = 1; 805 #endif 806 setup_clear_cpu_cap(X86_FEATURE_APIC); 807 } 808 809 #ifdef CONFIG_PCI 810 if (pci_early_dump_regs) 811 early_dump_pci_devices(); 812 #endif 813 814 finish_e820_parsing(); 815 816 if (efi_enabled) 817 efi_init(); 818 819 dmi_scan_machine(); 820 821 /* 822 * VMware detection requires dmi to be available, so this 823 * needs to be done after dmi_scan_machine, for the BP. 824 */ 825 init_hypervisor_platform(); 826 827 x86_init.resources.probe_roms(); 828 829 /* after parse_early_param, so could debug it */ 830 insert_resource(&iomem_resource, &code_resource); 831 insert_resource(&iomem_resource, &data_resource); 832 insert_resource(&iomem_resource, &bss_resource); 833 834 trim_bios_range(); 835 #ifdef CONFIG_X86_32 836 if (ppro_with_ram_bug()) { 837 e820_update_range(0x70000000ULL, 0x40000ULL, E820_RAM, 838 E820_RESERVED); 839 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); 840 printk(KERN_INFO "fixed physical RAM map:\n"); 841 e820_print_map("bad_ppro"); 842 } 843 #else 844 early_gart_iommu_check(); 845 #endif 846 847 /* 848 * partially used pages are not usable - thus 849 * we are rounding upwards: 850 */ 851 max_pfn = e820_end_of_ram_pfn(); 852 853 /* update e820 for memory not covered by WB MTRRs */ 854 mtrr_bp_init(); 855 if (mtrr_trim_uncached_memory(max_pfn)) 856 max_pfn = e820_end_of_ram_pfn(); 857 858 #ifdef CONFIG_X86_32 859 /* max_low_pfn get updated here */ 860 find_low_pfn_range(); 861 #else 862 num_physpages = max_pfn; 863 864 check_x2apic(); 865 866 /* How many end-of-memory variables you have, grandma! */ 867 /* need this before calling reserve_initrd */ 868 if (max_pfn > (1UL<<(32 - PAGE_SHIFT))) 869 max_low_pfn = e820_end_of_low_ram_pfn(); 870 else 871 max_low_pfn = max_pfn; 872 873 high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1; 874 #endif 875 876 /* 877 * Find and reserve possible boot-time SMP configuration: 878 */ 879 find_smp_config(); 880 881 reserve_ibft_region(); 882 883 /* 884 * Need to conclude brk, before memblock_x86_fill() 885 * it could use memblock_find_in_range, could overlap with 886 * brk area. 887 */ 888 reserve_brk(); 889 890 cleanup_highmap(); 891 892 memblock.current_limit = get_max_mapped(); 893 memblock_x86_fill(); 894 895 /* 896 * The EFI specification says that boot service code won't be called 897 * after ExitBootServices(). This is, in fact, a lie. 898 */ 899 if (efi_enabled) 900 efi_reserve_boot_services(); 901 902 /* preallocate 4k for mptable mpc */ 903 early_reserve_e820_mpc_new(); 904 905 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION 906 setup_bios_corruption_check(); 907 #endif 908 909 printk(KERN_DEBUG "initial memory mapped: [mem 0x00000000-%#010lx]\n", 910 (max_pfn_mapped<<PAGE_SHIFT) - 1); 911 912 setup_real_mode(); 913 914 init_gbpages(); 915 916 /* max_pfn_mapped is updated here */ 917 max_low_pfn_mapped = init_memory_mapping(0, max_low_pfn<<PAGE_SHIFT); 918 max_pfn_mapped = max_low_pfn_mapped; 919 920 #ifdef CONFIG_X86_64 921 if (max_pfn > max_low_pfn) { 922 max_pfn_mapped = init_memory_mapping(1UL<<32, 923 max_pfn<<PAGE_SHIFT); 924 /* can we preseve max_low_pfn ?*/ 925 max_low_pfn = max_pfn; 926 } 927 #endif 928 memblock.current_limit = get_max_mapped(); 929 dma_contiguous_reserve(0); 930 931 /* 932 * NOTE: On x86-32, only from this point on, fixmaps are ready for use. 933 */ 934 935 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT 936 if (init_ohci1394_dma_early) 937 init_ohci1394_dma_on_all_controllers(); 938 #endif 939 /* Allocate bigger log buffer */ 940 setup_log_buf(1); 941 942 reserve_initrd(); 943 944 reserve_crashkernel(); 945 946 vsmp_init(); 947 948 io_delay_init(); 949 950 /* 951 * Parse the ACPI tables for possible boot-time SMP configuration. 952 */ 953 acpi_boot_table_init(); 954 955 early_acpi_boot_init(); 956 957 initmem_init(); 958 memblock_find_dma_reserve(); 959 960 #ifdef CONFIG_KVM_CLOCK 961 kvmclock_init(); 962 #endif 963 964 x86_init.paging.pagetable_setup_start(swapper_pg_dir); 965 paging_init(); 966 x86_init.paging.pagetable_setup_done(swapper_pg_dir); 967 968 if (boot_cpu_data.cpuid_level >= 0) { 969 /* A CPU has %cr4 if and only if it has CPUID */ 970 mmu_cr4_features = read_cr4(); 971 if (trampoline_cr4_features) 972 *trampoline_cr4_features = mmu_cr4_features; 973 } 974 975 #ifdef CONFIG_X86_32 976 /* sync back kernel address range */ 977 clone_pgd_range(initial_page_table + KERNEL_PGD_BOUNDARY, 978 swapper_pg_dir + KERNEL_PGD_BOUNDARY, 979 KERNEL_PGD_PTRS); 980 #endif 981 982 tboot_probe(); 983 984 #ifdef CONFIG_X86_64 985 map_vsyscall(); 986 #endif 987 988 generic_apic_probe(); 989 990 early_quirks(); 991 992 /* 993 * Read APIC and some other early information from ACPI tables. 994 */ 995 acpi_boot_init(); 996 sfi_init(); 997 x86_dtb_init(); 998 999 /* 1000 * get boot-time SMP configuration: 1001 */ 1002 if (smp_found_config) 1003 get_smp_config(); 1004 1005 prefill_possible_map(); 1006 1007 init_cpu_to_node(); 1008 1009 init_apic_mappings(); 1010 if (x86_io_apic_ops.init) 1011 x86_io_apic_ops.init(); 1012 1013 kvm_guest_init(); 1014 1015 e820_reserve_resources(); 1016 e820_mark_nosave_regions(max_low_pfn); 1017 1018 x86_init.resources.reserve_resources(); 1019 1020 e820_setup_gap(); 1021 1022 #ifdef CONFIG_VT 1023 #if defined(CONFIG_VGA_CONSOLE) 1024 if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY)) 1025 conswitchp = &vga_con; 1026 #elif defined(CONFIG_DUMMY_CONSOLE) 1027 conswitchp = &dummy_con; 1028 #endif 1029 #endif 1030 x86_init.oem.banner(); 1031 1032 x86_init.timers.wallclock_init(); 1033 1034 mcheck_init(); 1035 1036 arch_init_ideal_nops(); 1037 } 1038 1039 #ifdef CONFIG_X86_32 1040 1041 static struct resource video_ram_resource = { 1042 .name = "Video RAM area", 1043 .start = 0xa0000, 1044 .end = 0xbffff, 1045 .flags = IORESOURCE_BUSY | IORESOURCE_MEM 1046 }; 1047 1048 void __init i386_reserve_resources(void) 1049 { 1050 request_resource(&iomem_resource, &video_ram_resource); 1051 reserve_standard_io_resources(); 1052 } 1053 1054 #endif /* CONFIG_X86_32 */ 1055