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/mca.h> 38 #include <linux/root_dev.h> 39 #include <linux/highmem.h> 40 #include <linux/module.h> 41 #include <linux/efi.h> 42 #include <linux/init.h> 43 #include <linux/edd.h> 44 #include <linux/iscsi_ibft.h> 45 #include <linux/nodemask.h> 46 #include <linux/kexec.h> 47 #include <linux/dmi.h> 48 #include <linux/pfn.h> 49 #include <linux/pci.h> 50 #include <asm/pci-direct.h> 51 #include <linux/init_ohci1394_dma.h> 52 #include <linux/kvm_para.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/trampoline.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/system.h> 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 static void set_mca_bus(int x) 184 { 185 #ifdef CONFIG_MCA 186 MCA_bus = x; 187 #endif 188 } 189 190 unsigned int def_to_bigsmp; 191 192 /* for MCA, but anyone else can use it if they want */ 193 unsigned int machine_id; 194 unsigned int machine_submodel_id; 195 unsigned int BIOS_revision; 196 197 struct apm_info apm_info; 198 EXPORT_SYMBOL(apm_info); 199 200 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \ 201 defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE) 202 struct ist_info ist_info; 203 EXPORT_SYMBOL(ist_info); 204 #else 205 struct ist_info ist_info; 206 #endif 207 208 #else 209 struct cpuinfo_x86 boot_cpu_data __read_mostly = { 210 .x86_phys_bits = MAX_PHYSMEM_BITS, 211 }; 212 EXPORT_SYMBOL(boot_cpu_data); 213 #endif 214 215 216 #if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64) 217 unsigned long mmu_cr4_features; 218 #else 219 unsigned long mmu_cr4_features = X86_CR4_PAE; 220 #endif 221 222 /* Boot loader ID and version as integers, for the benefit of proc_dointvec */ 223 int bootloader_type, bootloader_version; 224 225 /* 226 * Setup options 227 */ 228 struct screen_info screen_info; 229 EXPORT_SYMBOL(screen_info); 230 struct edid_info edid_info; 231 EXPORT_SYMBOL_GPL(edid_info); 232 233 extern int root_mountflags; 234 235 unsigned long saved_video_mode; 236 237 #define RAMDISK_IMAGE_START_MASK 0x07FF 238 #define RAMDISK_PROMPT_FLAG 0x8000 239 #define RAMDISK_LOAD_FLAG 0x4000 240 241 static char __initdata command_line[COMMAND_LINE_SIZE]; 242 #ifdef CONFIG_CMDLINE_BOOL 243 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE; 244 #endif 245 246 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE) 247 struct edd edd; 248 #ifdef CONFIG_EDD_MODULE 249 EXPORT_SYMBOL(edd); 250 #endif 251 /** 252 * copy_edd() - Copy the BIOS EDD information 253 * from boot_params into a safe place. 254 * 255 */ 256 static inline void __init copy_edd(void) 257 { 258 memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer, 259 sizeof(edd.mbr_signature)); 260 memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info)); 261 edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries; 262 edd.edd_info_nr = boot_params.eddbuf_entries; 263 } 264 #else 265 static inline void __init copy_edd(void) 266 { 267 } 268 #endif 269 270 void * __init extend_brk(size_t size, size_t align) 271 { 272 size_t mask = align - 1; 273 void *ret; 274 275 BUG_ON(_brk_start == 0); 276 BUG_ON(align & mask); 277 278 _brk_end = (_brk_end + mask) & ~mask; 279 BUG_ON((char *)(_brk_end + size) > __brk_limit); 280 281 ret = (void *)_brk_end; 282 _brk_end += size; 283 284 memset(ret, 0, size); 285 286 return ret; 287 } 288 289 #ifdef CONFIG_X86_64 290 static void __init init_gbpages(void) 291 { 292 if (direct_gbpages && cpu_has_gbpages) 293 printk(KERN_INFO "Using GB pages for direct mapping\n"); 294 else 295 direct_gbpages = 0; 296 } 297 #else 298 static inline void init_gbpages(void) 299 { 300 } 301 static void __init cleanup_highmap(void) 302 { 303 } 304 #endif 305 306 static void __init reserve_brk(void) 307 { 308 if (_brk_end > _brk_start) 309 memblock_x86_reserve_range(__pa(_brk_start), __pa(_brk_end), "BRK"); 310 311 /* Mark brk area as locked down and no longer taking any 312 new allocations */ 313 _brk_start = 0; 314 } 315 316 #ifdef CONFIG_BLK_DEV_INITRD 317 318 #define MAX_MAP_CHUNK (NR_FIX_BTMAPS << PAGE_SHIFT) 319 static void __init relocate_initrd(void) 320 { 321 /* Assume only end is not page aligned */ 322 u64 ramdisk_image = boot_params.hdr.ramdisk_image; 323 u64 ramdisk_size = boot_params.hdr.ramdisk_size; 324 u64 area_size = PAGE_ALIGN(ramdisk_size); 325 u64 end_of_lowmem = max_low_pfn_mapped << PAGE_SHIFT; 326 u64 ramdisk_here; 327 unsigned long slop, clen, mapaddr; 328 char *p, *q; 329 330 /* We need to move the initrd down into lowmem */ 331 ramdisk_here = memblock_find_in_range(0, end_of_lowmem, area_size, 332 PAGE_SIZE); 333 334 if (ramdisk_here == MEMBLOCK_ERROR) 335 panic("Cannot find place for new RAMDISK of size %lld\n", 336 ramdisk_size); 337 338 /* Note: this includes all the lowmem currently occupied by 339 the initrd, we rely on that fact to keep the data intact. */ 340 memblock_x86_reserve_range(ramdisk_here, ramdisk_here + area_size, "NEW RAMDISK"); 341 initrd_start = ramdisk_here + PAGE_OFFSET; 342 initrd_end = initrd_start + ramdisk_size; 343 printk(KERN_INFO "Allocated new RAMDISK: %08llx - %08llx\n", 344 ramdisk_here, ramdisk_here + ramdisk_size); 345 346 q = (char *)initrd_start; 347 348 /* Copy any lowmem portion of the initrd */ 349 if (ramdisk_image < end_of_lowmem) { 350 clen = end_of_lowmem - ramdisk_image; 351 p = (char *)__va(ramdisk_image); 352 memcpy(q, p, clen); 353 q += clen; 354 ramdisk_image += clen; 355 ramdisk_size -= clen; 356 } 357 358 /* Copy the highmem portion of the initrd */ 359 while (ramdisk_size) { 360 slop = ramdisk_image & ~PAGE_MASK; 361 clen = ramdisk_size; 362 if (clen > MAX_MAP_CHUNK-slop) 363 clen = MAX_MAP_CHUNK-slop; 364 mapaddr = ramdisk_image & PAGE_MASK; 365 p = early_memremap(mapaddr, clen+slop); 366 memcpy(q, p+slop, clen); 367 early_iounmap(p, clen+slop); 368 q += clen; 369 ramdisk_image += clen; 370 ramdisk_size -= clen; 371 } 372 /* high pages is not converted by early_res_to_bootmem */ 373 ramdisk_image = boot_params.hdr.ramdisk_image; 374 ramdisk_size = boot_params.hdr.ramdisk_size; 375 printk(KERN_INFO "Move RAMDISK from %016llx - %016llx to" 376 " %08llx - %08llx\n", 377 ramdisk_image, ramdisk_image + ramdisk_size - 1, 378 ramdisk_here, ramdisk_here + ramdisk_size - 1); 379 } 380 381 static void __init reserve_initrd(void) 382 { 383 /* Assume only end is not page aligned */ 384 u64 ramdisk_image = boot_params.hdr.ramdisk_image; 385 u64 ramdisk_size = boot_params.hdr.ramdisk_size; 386 u64 ramdisk_end = PAGE_ALIGN(ramdisk_image + ramdisk_size); 387 u64 end_of_lowmem = max_low_pfn_mapped << PAGE_SHIFT; 388 389 if (!boot_params.hdr.type_of_loader || 390 !ramdisk_image || !ramdisk_size) 391 return; /* No initrd provided by bootloader */ 392 393 initrd_start = 0; 394 395 if (ramdisk_size >= (end_of_lowmem>>1)) { 396 memblock_x86_free_range(ramdisk_image, ramdisk_end); 397 printk(KERN_ERR "initrd too large to handle, " 398 "disabling initrd\n"); 399 return; 400 } 401 402 printk(KERN_INFO "RAMDISK: %08llx - %08llx\n", ramdisk_image, 403 ramdisk_end); 404 405 406 if (ramdisk_end <= end_of_lowmem) { 407 /* All in lowmem, easy case */ 408 /* 409 * don't need to reserve again, already reserved early 410 * in i386_start_kernel 411 */ 412 initrd_start = ramdisk_image + PAGE_OFFSET; 413 initrd_end = initrd_start + ramdisk_size; 414 return; 415 } 416 417 relocate_initrd(); 418 419 memblock_x86_free_range(ramdisk_image, ramdisk_end); 420 } 421 #else 422 static void __init reserve_initrd(void) 423 { 424 } 425 #endif /* CONFIG_BLK_DEV_INITRD */ 426 427 static void __init parse_setup_data(void) 428 { 429 struct setup_data *data; 430 u64 pa_data; 431 432 if (boot_params.hdr.version < 0x0209) 433 return; 434 pa_data = boot_params.hdr.setup_data; 435 while (pa_data) { 436 u32 data_len, map_len; 437 438 map_len = max(PAGE_SIZE - (pa_data & ~PAGE_MASK), 439 (u64)sizeof(struct setup_data)); 440 data = early_memremap(pa_data, map_len); 441 data_len = data->len + sizeof(struct setup_data); 442 if (data_len > map_len) { 443 early_iounmap(data, map_len); 444 data = early_memremap(pa_data, data_len); 445 map_len = data_len; 446 } 447 448 switch (data->type) { 449 case SETUP_E820_EXT: 450 parse_e820_ext(data); 451 break; 452 case SETUP_DTB: 453 add_dtb(pa_data); 454 break; 455 default: 456 break; 457 } 458 pa_data = data->next; 459 early_iounmap(data, map_len); 460 } 461 } 462 463 static void __init e820_reserve_setup_data(void) 464 { 465 struct setup_data *data; 466 u64 pa_data; 467 int found = 0; 468 469 if (boot_params.hdr.version < 0x0209) 470 return; 471 pa_data = boot_params.hdr.setup_data; 472 while (pa_data) { 473 data = early_memremap(pa_data, sizeof(*data)); 474 e820_update_range(pa_data, sizeof(*data)+data->len, 475 E820_RAM, E820_RESERVED_KERN); 476 found = 1; 477 pa_data = data->next; 478 early_iounmap(data, sizeof(*data)); 479 } 480 if (!found) 481 return; 482 483 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); 484 memcpy(&e820_saved, &e820, sizeof(struct e820map)); 485 printk(KERN_INFO "extended physical RAM map:\n"); 486 e820_print_map("reserve setup_data"); 487 } 488 489 static void __init memblock_x86_reserve_range_setup_data(void) 490 { 491 struct setup_data *data; 492 u64 pa_data; 493 char buf[32]; 494 495 if (boot_params.hdr.version < 0x0209) 496 return; 497 pa_data = boot_params.hdr.setup_data; 498 while (pa_data) { 499 data = early_memremap(pa_data, sizeof(*data)); 500 sprintf(buf, "setup data %x", data->type); 501 memblock_x86_reserve_range(pa_data, pa_data+sizeof(*data)+data->len, buf); 502 pa_data = data->next; 503 early_iounmap(data, sizeof(*data)); 504 } 505 } 506 507 /* 508 * --------- Crashkernel reservation ------------------------------ 509 */ 510 511 #ifdef CONFIG_KEXEC 512 513 static inline unsigned long long get_total_mem(void) 514 { 515 unsigned long long total; 516 517 total = max_pfn - min_low_pfn; 518 519 return total << PAGE_SHIFT; 520 } 521 522 /* 523 * Keep the crash kernel below this limit. On 32 bits earlier kernels 524 * would limit the kernel to the low 512 MiB due to mapping restrictions. 525 * On 64 bits, kexec-tools currently limits us to 896 MiB; increase this 526 * limit once kexec-tools are fixed. 527 */ 528 #ifdef CONFIG_X86_32 529 # define CRASH_KERNEL_ADDR_MAX (512 << 20) 530 #else 531 # define CRASH_KERNEL_ADDR_MAX (896 << 20) 532 #endif 533 534 static void __init reserve_crashkernel(void) 535 { 536 unsigned long long total_mem; 537 unsigned long long crash_size, crash_base; 538 int ret; 539 540 total_mem = get_total_mem(); 541 542 ret = parse_crashkernel(boot_command_line, total_mem, 543 &crash_size, &crash_base); 544 if (ret != 0 || crash_size <= 0) 545 return; 546 547 /* 0 means: find the address automatically */ 548 if (crash_base <= 0) { 549 const unsigned long long alignment = 16<<20; /* 16M */ 550 551 /* 552 * kexec want bzImage is below CRASH_KERNEL_ADDR_MAX 553 */ 554 crash_base = memblock_find_in_range(alignment, 555 CRASH_KERNEL_ADDR_MAX, crash_size, alignment); 556 557 if (crash_base == MEMBLOCK_ERROR) { 558 pr_info("crashkernel reservation failed - No suitable area found.\n"); 559 return; 560 } 561 } else { 562 unsigned long long start; 563 564 start = memblock_find_in_range(crash_base, 565 crash_base + crash_size, crash_size, 1<<20); 566 if (start != crash_base) { 567 pr_info("crashkernel reservation failed - memory is in use.\n"); 568 return; 569 } 570 } 571 memblock_x86_reserve_range(crash_base, crash_base + crash_size, "CRASH KERNEL"); 572 573 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB " 574 "for crashkernel (System RAM: %ldMB)\n", 575 (unsigned long)(crash_size >> 20), 576 (unsigned long)(crash_base >> 20), 577 (unsigned long)(total_mem >> 20)); 578 579 crashk_res.start = crash_base; 580 crashk_res.end = crash_base + crash_size - 1; 581 insert_resource(&iomem_resource, &crashk_res); 582 } 583 #else 584 static void __init reserve_crashkernel(void) 585 { 586 } 587 #endif 588 589 static struct resource standard_io_resources[] = { 590 { .name = "dma1", .start = 0x00, .end = 0x1f, 591 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 592 { .name = "pic1", .start = 0x20, .end = 0x21, 593 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 594 { .name = "timer0", .start = 0x40, .end = 0x43, 595 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 596 { .name = "timer1", .start = 0x50, .end = 0x53, 597 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 598 { .name = "keyboard", .start = 0x60, .end = 0x60, 599 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 600 { .name = "keyboard", .start = 0x64, .end = 0x64, 601 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 602 { .name = "dma page reg", .start = 0x80, .end = 0x8f, 603 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 604 { .name = "pic2", .start = 0xa0, .end = 0xa1, 605 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 606 { .name = "dma2", .start = 0xc0, .end = 0xdf, 607 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 608 { .name = "fpu", .start = 0xf0, .end = 0xff, 609 .flags = IORESOURCE_BUSY | IORESOURCE_IO } 610 }; 611 612 void __init reserve_standard_io_resources(void) 613 { 614 int i; 615 616 /* request I/O space for devices used on all i[345]86 PCs */ 617 for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++) 618 request_resource(&ioport_resource, &standard_io_resources[i]); 619 620 } 621 622 /* 623 * Note: elfcorehdr_addr is not just limited to vmcore. It is also used by 624 * is_kdump_kernel() to determine if we are booting after a panic. Hence 625 * ifdef it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE. 626 */ 627 628 #ifdef CONFIG_CRASH_DUMP 629 /* elfcorehdr= specifies the location of elf core header 630 * stored by the crashed kernel. This option will be passed 631 * by kexec loader to the capture kernel. 632 */ 633 static int __init setup_elfcorehdr(char *arg) 634 { 635 char *end; 636 if (!arg) 637 return -EINVAL; 638 elfcorehdr_addr = memparse(arg, &end); 639 return end > arg ? 0 : -EINVAL; 640 } 641 early_param("elfcorehdr", setup_elfcorehdr); 642 #endif 643 644 static __init void reserve_ibft_region(void) 645 { 646 unsigned long addr, size = 0; 647 648 addr = find_ibft_region(&size); 649 650 if (size) 651 memblock_x86_reserve_range(addr, addr + size, "* ibft"); 652 } 653 654 static unsigned reserve_low = CONFIG_X86_RESERVE_LOW << 10; 655 656 static void __init trim_bios_range(void) 657 { 658 /* 659 * A special case is the first 4Kb of memory; 660 * This is a BIOS owned area, not kernel ram, but generally 661 * not listed as such in the E820 table. 662 * 663 * This typically reserves additional memory (64KiB by default) 664 * since some BIOSes are known to corrupt low memory. See the 665 * Kconfig help text for X86_RESERVE_LOW. 666 */ 667 e820_update_range(0, ALIGN(reserve_low, PAGE_SIZE), 668 E820_RAM, E820_RESERVED); 669 670 /* 671 * special case: Some BIOSen report the PC BIOS 672 * area (640->1Mb) as ram even though it is not. 673 * take them out. 674 */ 675 e820_remove_range(BIOS_BEGIN, BIOS_END - BIOS_BEGIN, E820_RAM, 1); 676 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); 677 } 678 679 static int __init parse_reservelow(char *p) 680 { 681 unsigned long long size; 682 683 if (!p) 684 return -EINVAL; 685 686 size = memparse(p, &p); 687 688 if (size < 4096) 689 size = 4096; 690 691 if (size > 640*1024) 692 size = 640*1024; 693 694 reserve_low = size; 695 696 return 0; 697 } 698 699 early_param("reservelow", parse_reservelow); 700 701 /* 702 * Determine if we were loaded by an EFI loader. If so, then we have also been 703 * passed the efi memmap, systab, etc., so we should use these data structures 704 * for initialization. Note, the efi init code path is determined by the 705 * global efi_enabled. This allows the same kernel image to be used on existing 706 * systems (with a traditional BIOS) as well as on EFI systems. 707 */ 708 /* 709 * setup_arch - architecture-specific boot-time initializations 710 * 711 * Note: On x86_64, fixmaps are ready for use even before this is called. 712 */ 713 714 void __init setup_arch(char **cmdline_p) 715 { 716 unsigned long flags; 717 718 #ifdef CONFIG_X86_32 719 memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data)); 720 visws_early_detect(); 721 722 /* 723 * copy kernel address range established so far and switch 724 * to the proper swapper page table 725 */ 726 clone_pgd_range(swapper_pg_dir + KERNEL_PGD_BOUNDARY, 727 initial_page_table + KERNEL_PGD_BOUNDARY, 728 KERNEL_PGD_PTRS); 729 730 load_cr3(swapper_pg_dir); 731 __flush_tlb_all(); 732 #else 733 printk(KERN_INFO "Command line: %s\n", boot_command_line); 734 #endif 735 736 /* 737 * If we have OLPC OFW, we might end up relocating the fixmap due to 738 * reserve_top(), so do this before touching the ioremap area. 739 */ 740 olpc_ofw_detect(); 741 742 early_trap_init(); 743 early_cpu_init(); 744 early_ioremap_init(); 745 746 setup_olpc_ofw_pgd(); 747 748 ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev); 749 screen_info = boot_params.screen_info; 750 edid_info = boot_params.edid_info; 751 #ifdef CONFIG_X86_32 752 apm_info.bios = boot_params.apm_bios_info; 753 ist_info = boot_params.ist_info; 754 if (boot_params.sys_desc_table.length != 0) { 755 set_mca_bus(boot_params.sys_desc_table.table[3] & 0x2); 756 machine_id = boot_params.sys_desc_table.table[0]; 757 machine_submodel_id = boot_params.sys_desc_table.table[1]; 758 BIOS_revision = boot_params.sys_desc_table.table[2]; 759 } 760 #endif 761 saved_video_mode = boot_params.hdr.vid_mode; 762 bootloader_type = boot_params.hdr.type_of_loader; 763 if ((bootloader_type >> 4) == 0xe) { 764 bootloader_type &= 0xf; 765 bootloader_type |= (boot_params.hdr.ext_loader_type+0x10) << 4; 766 } 767 bootloader_version = bootloader_type & 0xf; 768 bootloader_version |= boot_params.hdr.ext_loader_ver << 4; 769 770 #ifdef CONFIG_BLK_DEV_RAM 771 rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK; 772 rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0); 773 rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0); 774 #endif 775 #ifdef CONFIG_EFI 776 if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature, 777 #ifdef CONFIG_X86_32 778 "EL32", 779 #else 780 "EL64", 781 #endif 782 4)) { 783 efi_enabled = 1; 784 efi_memblock_x86_reserve_range(); 785 } 786 #endif 787 788 x86_init.oem.arch_setup(); 789 790 iomem_resource.end = (1ULL << boot_cpu_data.x86_phys_bits) - 1; 791 setup_memory_map(); 792 parse_setup_data(); 793 /* update the e820_saved too */ 794 e820_reserve_setup_data(); 795 796 copy_edd(); 797 798 if (!boot_params.hdr.root_flags) 799 root_mountflags &= ~MS_RDONLY; 800 init_mm.start_code = (unsigned long) _text; 801 init_mm.end_code = (unsigned long) _etext; 802 init_mm.end_data = (unsigned long) _edata; 803 init_mm.brk = _brk_end; 804 805 code_resource.start = virt_to_phys(_text); 806 code_resource.end = virt_to_phys(_etext)-1; 807 data_resource.start = virt_to_phys(_etext); 808 data_resource.end = virt_to_phys(_edata)-1; 809 bss_resource.start = virt_to_phys(&__bss_start); 810 bss_resource.end = virt_to_phys(&__bss_stop)-1; 811 812 #ifdef CONFIG_CMDLINE_BOOL 813 #ifdef CONFIG_CMDLINE_OVERRIDE 814 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE); 815 #else 816 if (builtin_cmdline[0]) { 817 /* append boot loader cmdline to builtin */ 818 strlcat(builtin_cmdline, " ", COMMAND_LINE_SIZE); 819 strlcat(builtin_cmdline, boot_command_line, COMMAND_LINE_SIZE); 820 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE); 821 } 822 #endif 823 #endif 824 825 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE); 826 *cmdline_p = command_line; 827 828 /* 829 * x86_configure_nx() is called before parse_early_param() to detect 830 * whether hardware doesn't support NX (so that the early EHCI debug 831 * console setup can safely call set_fixmap()). It may then be called 832 * again from within noexec_setup() during parsing early parameters 833 * to honor the respective command line option. 834 */ 835 x86_configure_nx(); 836 837 parse_early_param(); 838 839 x86_report_nx(); 840 841 /* after early param, so could get panic from serial */ 842 memblock_x86_reserve_range_setup_data(); 843 844 if (acpi_mps_check()) { 845 #ifdef CONFIG_X86_LOCAL_APIC 846 disable_apic = 1; 847 #endif 848 setup_clear_cpu_cap(X86_FEATURE_APIC); 849 } 850 851 #ifdef CONFIG_PCI 852 if (pci_early_dump_regs) 853 early_dump_pci_devices(); 854 #endif 855 856 finish_e820_parsing(); 857 858 if (efi_enabled) 859 efi_init(); 860 861 dmi_scan_machine(); 862 863 /* 864 * VMware detection requires dmi to be available, so this 865 * needs to be done after dmi_scan_machine, for the BP. 866 */ 867 init_hypervisor_platform(); 868 869 x86_init.resources.probe_roms(); 870 871 /* after parse_early_param, so could debug it */ 872 insert_resource(&iomem_resource, &code_resource); 873 insert_resource(&iomem_resource, &data_resource); 874 insert_resource(&iomem_resource, &bss_resource); 875 876 trim_bios_range(); 877 #ifdef CONFIG_X86_32 878 if (ppro_with_ram_bug()) { 879 e820_update_range(0x70000000ULL, 0x40000ULL, E820_RAM, 880 E820_RESERVED); 881 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); 882 printk(KERN_INFO "fixed physical RAM map:\n"); 883 e820_print_map("bad_ppro"); 884 } 885 #else 886 early_gart_iommu_check(); 887 #endif 888 889 /* 890 * partially used pages are not usable - thus 891 * we are rounding upwards: 892 */ 893 max_pfn = e820_end_of_ram_pfn(); 894 895 /* update e820 for memory not covered by WB MTRRs */ 896 mtrr_bp_init(); 897 if (mtrr_trim_uncached_memory(max_pfn)) 898 max_pfn = e820_end_of_ram_pfn(); 899 900 #ifdef CONFIG_X86_32 901 /* max_low_pfn get updated here */ 902 find_low_pfn_range(); 903 #else 904 num_physpages = max_pfn; 905 906 check_x2apic(); 907 908 /* How many end-of-memory variables you have, grandma! */ 909 /* need this before calling reserve_initrd */ 910 if (max_pfn > (1UL<<(32 - PAGE_SHIFT))) 911 max_low_pfn = e820_end_of_low_ram_pfn(); 912 else 913 max_low_pfn = max_pfn; 914 915 high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1; 916 #endif 917 918 /* 919 * Find and reserve possible boot-time SMP configuration: 920 */ 921 find_smp_config(); 922 923 reserve_ibft_region(); 924 925 /* 926 * Need to conclude brk, before memblock_x86_fill() 927 * it could use memblock_find_in_range, could overlap with 928 * brk area. 929 */ 930 reserve_brk(); 931 932 cleanup_highmap(); 933 934 memblock.current_limit = get_max_mapped(); 935 memblock_x86_fill(); 936 937 /* preallocate 4k for mptable mpc */ 938 early_reserve_e820_mpc_new(); 939 940 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION 941 setup_bios_corruption_check(); 942 #endif 943 944 printk(KERN_DEBUG "initial memory mapped : 0 - %08lx\n", 945 max_pfn_mapped<<PAGE_SHIFT); 946 947 setup_trampolines(); 948 949 init_gbpages(); 950 951 /* max_pfn_mapped is updated here */ 952 max_low_pfn_mapped = init_memory_mapping(0, max_low_pfn<<PAGE_SHIFT); 953 max_pfn_mapped = max_low_pfn_mapped; 954 955 #ifdef CONFIG_X86_64 956 if (max_pfn > max_low_pfn) { 957 max_pfn_mapped = init_memory_mapping(1UL<<32, 958 max_pfn<<PAGE_SHIFT); 959 /* can we preseve max_low_pfn ?*/ 960 max_low_pfn = max_pfn; 961 } 962 #endif 963 memblock.current_limit = get_max_mapped(); 964 965 /* 966 * NOTE: On x86-32, only from this point on, fixmaps are ready for use. 967 */ 968 969 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT 970 if (init_ohci1394_dma_early) 971 init_ohci1394_dma_on_all_controllers(); 972 #endif 973 974 reserve_initrd(); 975 976 reserve_crashkernel(); 977 978 vsmp_init(); 979 980 io_delay_init(); 981 982 /* 983 * Parse the ACPI tables for possible boot-time SMP configuration. 984 */ 985 acpi_boot_table_init(); 986 987 early_acpi_boot_init(); 988 989 initmem_init(); 990 memblock_find_dma_reserve(); 991 dma32_reserve_bootmem(); 992 993 #ifdef CONFIG_KVM_CLOCK 994 kvmclock_init(); 995 #endif 996 997 x86_init.paging.pagetable_setup_start(swapper_pg_dir); 998 paging_init(); 999 x86_init.paging.pagetable_setup_done(swapper_pg_dir); 1000 1001 #ifdef CONFIG_X86_32 1002 /* sync back kernel address range */ 1003 clone_pgd_range(initial_page_table + KERNEL_PGD_BOUNDARY, 1004 swapper_pg_dir + KERNEL_PGD_BOUNDARY, 1005 KERNEL_PGD_PTRS); 1006 #endif 1007 1008 tboot_probe(); 1009 1010 #ifdef CONFIG_X86_64 1011 map_vsyscall(); 1012 #endif 1013 1014 generic_apic_probe(); 1015 1016 early_quirks(); 1017 1018 /* 1019 * Read APIC and some other early information from ACPI tables. 1020 */ 1021 acpi_boot_init(); 1022 sfi_init(); 1023 x86_dtb_init(); 1024 1025 /* 1026 * get boot-time SMP configuration: 1027 */ 1028 if (smp_found_config) 1029 get_smp_config(); 1030 1031 prefill_possible_map(); 1032 1033 init_cpu_to_node(); 1034 1035 init_apic_mappings(); 1036 ioapic_and_gsi_init(); 1037 1038 kvm_guest_init(); 1039 1040 e820_reserve_resources(); 1041 e820_mark_nosave_regions(max_low_pfn); 1042 1043 x86_init.resources.reserve_resources(); 1044 1045 e820_setup_gap(); 1046 1047 #ifdef CONFIG_VT 1048 #if defined(CONFIG_VGA_CONSOLE) 1049 if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY)) 1050 conswitchp = &vga_con; 1051 #elif defined(CONFIG_DUMMY_CONSOLE) 1052 conswitchp = &dummy_con; 1053 #endif 1054 #endif 1055 x86_init.oem.banner(); 1056 1057 x86_init.timers.wallclock_init(); 1058 1059 mcheck_init(); 1060 1061 local_irq_save(flags); 1062 arch_init_ideal_nop5(); 1063 local_irq_restore(flags); 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