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 void __init trim_bios_range(void) 614 { 615 /* 616 * A special case is the first 4Kb of memory; 617 * This is a BIOS owned area, not kernel ram, but generally 618 * not listed as such in the E820 table. 619 * 620 * This typically reserves additional memory (64KiB by default) 621 * since some BIOSes are known to corrupt low memory. See the 622 * Kconfig help text for X86_RESERVE_LOW. 623 */ 624 e820_update_range(0, ALIGN(reserve_low, PAGE_SIZE), 625 E820_RAM, E820_RESERVED); 626 627 /* 628 * special case: Some BIOSen report the PC BIOS 629 * area (640->1Mb) as ram even though it is not. 630 * take them out. 631 */ 632 e820_remove_range(BIOS_BEGIN, BIOS_END - BIOS_BEGIN, E820_RAM, 1); 633 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); 634 } 635 636 static int __init parse_reservelow(char *p) 637 { 638 unsigned long long size; 639 640 if (!p) 641 return -EINVAL; 642 643 size = memparse(p, &p); 644 645 if (size < 4096) 646 size = 4096; 647 648 if (size > 640*1024) 649 size = 640*1024; 650 651 reserve_low = size; 652 653 return 0; 654 } 655 656 early_param("reservelow", parse_reservelow); 657 658 /* 659 * Determine if we were loaded by an EFI loader. If so, then we have also been 660 * passed the efi memmap, systab, etc., so we should use these data structures 661 * for initialization. Note, the efi init code path is determined by the 662 * global efi_enabled. This allows the same kernel image to be used on existing 663 * systems (with a traditional BIOS) as well as on EFI systems. 664 */ 665 /* 666 * setup_arch - architecture-specific boot-time initializations 667 * 668 * Note: On x86_64, fixmaps are ready for use even before this is called. 669 */ 670 671 void __init setup_arch(char **cmdline_p) 672 { 673 #ifdef CONFIG_X86_32 674 memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data)); 675 visws_early_detect(); 676 677 /* 678 * copy kernel address range established so far and switch 679 * to the proper swapper page table 680 */ 681 clone_pgd_range(swapper_pg_dir + KERNEL_PGD_BOUNDARY, 682 initial_page_table + KERNEL_PGD_BOUNDARY, 683 KERNEL_PGD_PTRS); 684 685 load_cr3(swapper_pg_dir); 686 __flush_tlb_all(); 687 #else 688 printk(KERN_INFO "Command line: %s\n", boot_command_line); 689 #endif 690 691 /* 692 * If we have OLPC OFW, we might end up relocating the fixmap due to 693 * reserve_top(), so do this before touching the ioremap area. 694 */ 695 olpc_ofw_detect(); 696 697 early_trap_init(); 698 early_cpu_init(); 699 early_ioremap_init(); 700 701 setup_olpc_ofw_pgd(); 702 703 ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev); 704 screen_info = boot_params.screen_info; 705 edid_info = boot_params.edid_info; 706 #ifdef CONFIG_X86_32 707 apm_info.bios = boot_params.apm_bios_info; 708 ist_info = boot_params.ist_info; 709 if (boot_params.sys_desc_table.length != 0) { 710 machine_id = boot_params.sys_desc_table.table[0]; 711 machine_submodel_id = boot_params.sys_desc_table.table[1]; 712 BIOS_revision = boot_params.sys_desc_table.table[2]; 713 } 714 #endif 715 saved_video_mode = boot_params.hdr.vid_mode; 716 bootloader_type = boot_params.hdr.type_of_loader; 717 if ((bootloader_type >> 4) == 0xe) { 718 bootloader_type &= 0xf; 719 bootloader_type |= (boot_params.hdr.ext_loader_type+0x10) << 4; 720 } 721 bootloader_version = bootloader_type & 0xf; 722 bootloader_version |= boot_params.hdr.ext_loader_ver << 4; 723 724 #ifdef CONFIG_BLK_DEV_RAM 725 rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK; 726 rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0); 727 rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0); 728 #endif 729 #ifdef CONFIG_EFI 730 if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature, 731 "EL32", 4)) { 732 efi_enabled = 1; 733 efi_64bit = false; 734 } else if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature, 735 "EL64", 4)) { 736 efi_enabled = 1; 737 efi_64bit = true; 738 } 739 if (efi_enabled && efi_memblock_x86_reserve_range()) 740 efi_enabled = 0; 741 #endif 742 743 x86_init.oem.arch_setup(); 744 745 iomem_resource.end = (1ULL << boot_cpu_data.x86_phys_bits) - 1; 746 setup_memory_map(); 747 parse_setup_data(); 748 /* update the e820_saved too */ 749 e820_reserve_setup_data(); 750 751 copy_edd(); 752 753 if (!boot_params.hdr.root_flags) 754 root_mountflags &= ~MS_RDONLY; 755 init_mm.start_code = (unsigned long) _text; 756 init_mm.end_code = (unsigned long) _etext; 757 init_mm.end_data = (unsigned long) _edata; 758 init_mm.brk = _brk_end; 759 760 code_resource.start = virt_to_phys(_text); 761 code_resource.end = virt_to_phys(_etext)-1; 762 data_resource.start = virt_to_phys(_etext); 763 data_resource.end = virt_to_phys(_edata)-1; 764 bss_resource.start = virt_to_phys(&__bss_start); 765 bss_resource.end = virt_to_phys(&__bss_stop)-1; 766 767 #ifdef CONFIG_CMDLINE_BOOL 768 #ifdef CONFIG_CMDLINE_OVERRIDE 769 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE); 770 #else 771 if (builtin_cmdline[0]) { 772 /* append boot loader cmdline to builtin */ 773 strlcat(builtin_cmdline, " ", COMMAND_LINE_SIZE); 774 strlcat(builtin_cmdline, boot_command_line, COMMAND_LINE_SIZE); 775 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE); 776 } 777 #endif 778 #endif 779 780 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE); 781 *cmdline_p = command_line; 782 783 /* 784 * x86_configure_nx() is called before parse_early_param() to detect 785 * whether hardware doesn't support NX (so that the early EHCI debug 786 * console setup can safely call set_fixmap()). It may then be called 787 * again from within noexec_setup() during parsing early parameters 788 * to honor the respective command line option. 789 */ 790 x86_configure_nx(); 791 792 parse_early_param(); 793 794 x86_report_nx(); 795 796 /* after early param, so could get panic from serial */ 797 memblock_x86_reserve_range_setup_data(); 798 799 if (acpi_mps_check()) { 800 #ifdef CONFIG_X86_LOCAL_APIC 801 disable_apic = 1; 802 #endif 803 setup_clear_cpu_cap(X86_FEATURE_APIC); 804 } 805 806 #ifdef CONFIG_PCI 807 if (pci_early_dump_regs) 808 early_dump_pci_devices(); 809 #endif 810 811 finish_e820_parsing(); 812 813 if (efi_enabled) 814 efi_init(); 815 816 dmi_scan_machine(); 817 818 /* 819 * VMware detection requires dmi to be available, so this 820 * needs to be done after dmi_scan_machine, for the BP. 821 */ 822 init_hypervisor_platform(); 823 824 x86_init.resources.probe_roms(); 825 826 /* after parse_early_param, so could debug it */ 827 insert_resource(&iomem_resource, &code_resource); 828 insert_resource(&iomem_resource, &data_resource); 829 insert_resource(&iomem_resource, &bss_resource); 830 831 trim_bios_range(); 832 #ifdef CONFIG_X86_32 833 if (ppro_with_ram_bug()) { 834 e820_update_range(0x70000000ULL, 0x40000ULL, E820_RAM, 835 E820_RESERVED); 836 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); 837 printk(KERN_INFO "fixed physical RAM map:\n"); 838 e820_print_map("bad_ppro"); 839 } 840 #else 841 early_gart_iommu_check(); 842 #endif 843 844 /* 845 * partially used pages are not usable - thus 846 * we are rounding upwards: 847 */ 848 max_pfn = e820_end_of_ram_pfn(); 849 850 /* update e820 for memory not covered by WB MTRRs */ 851 mtrr_bp_init(); 852 if (mtrr_trim_uncached_memory(max_pfn)) 853 max_pfn = e820_end_of_ram_pfn(); 854 855 #ifdef CONFIG_X86_32 856 /* max_low_pfn get updated here */ 857 find_low_pfn_range(); 858 #else 859 num_physpages = max_pfn; 860 861 check_x2apic(); 862 863 /* How many end-of-memory variables you have, grandma! */ 864 /* need this before calling reserve_initrd */ 865 if (max_pfn > (1UL<<(32 - PAGE_SHIFT))) 866 max_low_pfn = e820_end_of_low_ram_pfn(); 867 else 868 max_low_pfn = max_pfn; 869 870 high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1; 871 #endif 872 873 /* 874 * Find and reserve possible boot-time SMP configuration: 875 */ 876 find_smp_config(); 877 878 reserve_ibft_region(); 879 880 /* 881 * Need to conclude brk, before memblock_x86_fill() 882 * it could use memblock_find_in_range, could overlap with 883 * brk area. 884 */ 885 reserve_brk(); 886 887 cleanup_highmap(); 888 889 memblock.current_limit = get_max_mapped(); 890 memblock_x86_fill(); 891 892 /* 893 * The EFI specification says that boot service code won't be called 894 * after ExitBootServices(). This is, in fact, a lie. 895 */ 896 if (efi_enabled) 897 efi_reserve_boot_services(); 898 899 /* preallocate 4k for mptable mpc */ 900 early_reserve_e820_mpc_new(); 901 902 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION 903 setup_bios_corruption_check(); 904 #endif 905 906 printk(KERN_DEBUG "initial memory mapped: [mem 0x00000000-%#010lx]\n", 907 (max_pfn_mapped<<PAGE_SHIFT) - 1); 908 909 setup_real_mode(); 910 911 init_gbpages(); 912 913 /* max_pfn_mapped is updated here */ 914 max_low_pfn_mapped = init_memory_mapping(0, max_low_pfn<<PAGE_SHIFT); 915 max_pfn_mapped = max_low_pfn_mapped; 916 917 #ifdef CONFIG_X86_64 918 if (max_pfn > max_low_pfn) { 919 int i; 920 unsigned long start, end; 921 unsigned long start_pfn, end_pfn; 922 923 for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, 924 NULL) { 925 926 end = PFN_PHYS(end_pfn); 927 if (end <= (1UL<<32)) 928 continue; 929 930 start = PFN_PHYS(start_pfn); 931 max_pfn_mapped = init_memory_mapping( 932 max((1UL<<32), start), end); 933 } 934 935 /* can we preseve max_low_pfn ?*/ 936 max_low_pfn = max_pfn; 937 } 938 #endif 939 memblock.current_limit = get_max_mapped(); 940 dma_contiguous_reserve(0); 941 942 /* 943 * NOTE: On x86-32, only from this point on, fixmaps are ready for use. 944 */ 945 946 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT 947 if (init_ohci1394_dma_early) 948 init_ohci1394_dma_on_all_controllers(); 949 #endif 950 /* Allocate bigger log buffer */ 951 setup_log_buf(1); 952 953 reserve_initrd(); 954 955 #if defined(CONFIG_ACPI) && defined(CONFIG_BLK_DEV_INITRD) 956 acpi_initrd_override((void *)initrd_start, initrd_end - initrd_start); 957 #endif 958 959 reserve_crashkernel(); 960 961 vsmp_init(); 962 963 io_delay_init(); 964 965 /* 966 * Parse the ACPI tables for possible boot-time SMP configuration. 967 */ 968 acpi_boot_table_init(); 969 970 early_acpi_boot_init(); 971 972 initmem_init(); 973 memblock_find_dma_reserve(); 974 975 #ifdef CONFIG_KVM_GUEST 976 kvmclock_init(); 977 #endif 978 979 x86_init.paging.pagetable_init(); 980 981 if (boot_cpu_data.cpuid_level >= 0) { 982 /* A CPU has %cr4 if and only if it has CPUID */ 983 mmu_cr4_features = read_cr4(); 984 if (trampoline_cr4_features) 985 *trampoline_cr4_features = mmu_cr4_features; 986 } 987 988 #ifdef CONFIG_X86_32 989 /* sync back kernel address range */ 990 clone_pgd_range(initial_page_table + KERNEL_PGD_BOUNDARY, 991 swapper_pg_dir + KERNEL_PGD_BOUNDARY, 992 KERNEL_PGD_PTRS); 993 #endif 994 995 tboot_probe(); 996 997 #ifdef CONFIG_X86_64 998 map_vsyscall(); 999 #endif 1000 1001 generic_apic_probe(); 1002 1003 early_quirks(); 1004 1005 /* 1006 * Read APIC and some other early information from ACPI tables. 1007 */ 1008 acpi_boot_init(); 1009 sfi_init(); 1010 x86_dtb_init(); 1011 1012 /* 1013 * get boot-time SMP configuration: 1014 */ 1015 if (smp_found_config) 1016 get_smp_config(); 1017 1018 prefill_possible_map(); 1019 1020 init_cpu_to_node(); 1021 1022 init_apic_mappings(); 1023 if (x86_io_apic_ops.init) 1024 x86_io_apic_ops.init(); 1025 1026 kvm_guest_init(); 1027 1028 e820_reserve_resources(); 1029 e820_mark_nosave_regions(max_low_pfn); 1030 1031 x86_init.resources.reserve_resources(); 1032 1033 e820_setup_gap(); 1034 1035 #ifdef CONFIG_VT 1036 #if defined(CONFIG_VGA_CONSOLE) 1037 if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY)) 1038 conswitchp = &vga_con; 1039 #elif defined(CONFIG_DUMMY_CONSOLE) 1040 conswitchp = &dummy_con; 1041 #endif 1042 #endif 1043 x86_init.oem.banner(); 1044 1045 x86_init.timers.wallclock_init(); 1046 1047 mcheck_init(); 1048 1049 arch_init_ideal_nops(); 1050 1051 register_refined_jiffies(CLOCK_TICK_RATE); 1052 1053 #ifdef CONFIG_EFI 1054 /* Once setup is done above, disable efi_enabled on mismatched 1055 * firmware/kernel archtectures since there is no support for 1056 * runtime services. 1057 */ 1058 if (efi_enabled && IS_ENABLED(CONFIG_X86_64) != efi_64bit) { 1059 pr_info("efi: Setup done, disabling due to 32/64-bit mismatch\n"); 1060 efi_unmap_memmap(); 1061 efi_enabled = 0; 1062 } 1063 #endif 1064 } 1065 1066 #ifdef CONFIG_X86_32 1067 1068 static struct resource video_ram_resource = { 1069 .name = "Video RAM area", 1070 .start = 0xa0000, 1071 .end = 0xbffff, 1072 .flags = IORESOURCE_BUSY | IORESOURCE_MEM 1073 }; 1074 1075 void __init i386_reserve_resources(void) 1076 { 1077 request_resource(&iomem_resource, &video_ram_resource); 1078 reserve_standard_io_resources(); 1079 } 1080 1081 #endif /* CONFIG_X86_32 */ 1082