1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 1995 Linus Torvalds 4 * 5 * This file contains the setup_arch() code, which handles the architecture-dependent 6 * parts of early kernel initialization. 7 */ 8 #include <linux/acpi.h> 9 #include <linux/console.h> 10 #include <linux/cpu.h> 11 #include <linux/crash_dump.h> 12 #include <linux/dma-map-ops.h> 13 #include <linux/efi.h> 14 #include <linux/hugetlb.h> 15 #include <linux/ima.h> 16 #include <linux/init_ohci1394_dma.h> 17 #include <linux/initrd.h> 18 #include <linux/iscsi_ibft.h> 19 #include <linux/memblock.h> 20 #include <linux/panic_notifier.h> 21 #include <linux/pci.h> 22 #include <linux/random.h> 23 #include <linux/root_dev.h> 24 #include <linux/static_call.h> 25 #include <linux/sysfb.h> 26 #include <linux/swiotlb.h> 27 #include <linux/tboot.h> 28 #include <linux/usb/xhci-dbgp.h> 29 #include <linux/vmalloc.h> 30 31 #include <uapi/linux/mount.h> 32 33 #include <xen/xen.h> 34 35 #include <asm/apic.h> 36 #include <asm/bios_ebda.h> 37 #include <asm/bugs.h> 38 #include <asm/cacheinfo.h> 39 #include <asm/coco.h> 40 #include <asm/cpu.h> 41 #include <asm/efi.h> 42 #include <asm/gart.h> 43 #include <asm/hypervisor.h> 44 #include <asm/io_apic.h> 45 #include <asm/kasan.h> 46 #include <asm/kaslr.h> 47 #include <asm/mce.h> 48 #include <asm/memtype.h> 49 #include <asm/mtrr.h> 50 #include <asm/nmi.h> 51 #include <asm/numa.h> 52 #include <asm/olpc_ofw.h> 53 #include <asm/pci-direct.h> 54 #include <asm/prom.h> 55 #include <asm/proto.h> 56 #include <asm/realmode.h> 57 #include <asm/thermal.h> 58 #include <asm/unwind.h> 59 #include <asm/vsyscall.h> 60 61 /* 62 * max_low_pfn_mapped: highest directly mapped pfn < 4 GB 63 * max_pfn_mapped: highest directly mapped pfn > 4 GB 64 * 65 * The direct mapping only covers E820_TYPE_RAM regions, so the ranges and gaps are 66 * represented by pfn_mapped[]. 67 */ 68 unsigned long max_low_pfn_mapped; 69 unsigned long max_pfn_mapped; 70 71 #ifdef CONFIG_DMI 72 RESERVE_BRK(dmi_alloc, 65536); 73 #endif 74 75 76 unsigned long _brk_start = (unsigned long)__brk_base; 77 unsigned long _brk_end = (unsigned long)__brk_base; 78 79 struct boot_params boot_params; 80 81 /* 82 * These are the four main kernel memory regions, we put them into 83 * the resource tree so that kdump tools and other debugging tools 84 * recover it: 85 */ 86 87 static struct resource rodata_resource = { 88 .name = "Kernel rodata", 89 .start = 0, 90 .end = 0, 91 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM 92 }; 93 94 static struct resource data_resource = { 95 .name = "Kernel data", 96 .start = 0, 97 .end = 0, 98 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM 99 }; 100 101 static struct resource code_resource = { 102 .name = "Kernel code", 103 .start = 0, 104 .end = 0, 105 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM 106 }; 107 108 static struct resource bss_resource = { 109 .name = "Kernel bss", 110 .start = 0, 111 .end = 0, 112 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM 113 }; 114 115 116 #ifdef CONFIG_X86_32 117 /* CPU data as detected by the assembly code in head_32.S */ 118 struct cpuinfo_x86 new_cpu_data; 119 120 struct apm_info apm_info; 121 EXPORT_SYMBOL(apm_info); 122 123 #if IS_ENABLED(CONFIG_X86_SPEEDSTEP_SMI) 124 struct ist_info ist_info; 125 EXPORT_SYMBOL(ist_info); 126 #else 127 struct ist_info ist_info; 128 #endif 129 130 #endif 131 132 struct cpuinfo_x86 boot_cpu_data __read_mostly; 133 EXPORT_SYMBOL(boot_cpu_data); 134 SYM_PIC_ALIAS(boot_cpu_data); 135 136 #if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64) 137 __visible unsigned long mmu_cr4_features __ro_after_init; 138 #else 139 __visible unsigned long mmu_cr4_features __ro_after_init = X86_CR4_PAE; 140 #endif 141 142 #ifdef CONFIG_IMA 143 static phys_addr_t ima_kexec_buffer_phys; 144 static size_t ima_kexec_buffer_size; 145 #endif 146 147 /* Boot loader ID and version as integers, for the benefit of proc_dointvec */ 148 int bootloader_type, bootloader_version; 149 150 static const struct ctl_table x86_sysctl_table[] = { 151 { 152 .procname = "unknown_nmi_panic", 153 .data = &unknown_nmi_panic, 154 .maxlen = sizeof(int), 155 .mode = 0644, 156 .proc_handler = proc_dointvec, 157 }, 158 { 159 .procname = "panic_on_unrecovered_nmi", 160 .data = &panic_on_unrecovered_nmi, 161 .maxlen = sizeof(int), 162 .mode = 0644, 163 .proc_handler = proc_dointvec, 164 }, 165 { 166 .procname = "panic_on_io_nmi", 167 .data = &panic_on_io_nmi, 168 .maxlen = sizeof(int), 169 .mode = 0644, 170 .proc_handler = proc_dointvec, 171 }, 172 { 173 .procname = "bootloader_type", 174 .data = &bootloader_type, 175 .maxlen = sizeof(int), 176 .mode = 0444, 177 .proc_handler = proc_dointvec, 178 }, 179 { 180 .procname = "bootloader_version", 181 .data = &bootloader_version, 182 .maxlen = sizeof(int), 183 .mode = 0444, 184 .proc_handler = proc_dointvec, 185 }, 186 { 187 .procname = "io_delay_type", 188 .data = &io_delay_type, 189 .maxlen = sizeof(int), 190 .mode = 0644, 191 .proc_handler = proc_dointvec, 192 }, 193 #if defined(CONFIG_ACPI_SLEEP) 194 { 195 .procname = "acpi_video_flags", 196 .data = &acpi_realmode_flags, 197 .maxlen = sizeof(unsigned long), 198 .mode = 0644, 199 .proc_handler = proc_doulongvec_minmax, 200 }, 201 #endif 202 }; 203 204 static int __init init_x86_sysctl(void) 205 { 206 register_sysctl_init("kernel", x86_sysctl_table); 207 return 0; 208 } 209 arch_initcall(init_x86_sysctl); 210 211 /* 212 * Setup options 213 */ 214 215 struct sysfb_display_info sysfb_primary_display; 216 EXPORT_SYMBOL(sysfb_primary_display); 217 218 extern int root_mountflags; 219 220 unsigned long saved_video_mode; 221 222 #define RAMDISK_IMAGE_START_MASK 0x07FF 223 #define RAMDISK_PROMPT_FLAG 0x8000 224 #define RAMDISK_LOAD_FLAG 0x4000 225 226 static char __initdata command_line[COMMAND_LINE_SIZE]; 227 #ifdef CONFIG_CMDLINE_BOOL 228 char builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE; 229 bool builtin_cmdline_added __ro_after_init; 230 #endif 231 232 #if IS_ENABLED(CONFIG_EDD) 233 struct edd edd; 234 #ifdef CONFIG_EDD_MODULE 235 EXPORT_SYMBOL(edd); 236 #endif 237 /** 238 * copy_edd() - Copy the BIOS EDD information 239 * from boot_params into a safe place. 240 * 241 */ 242 static inline void __init copy_edd(void) 243 { 244 memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer, 245 sizeof(edd.mbr_signature)); 246 memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info)); 247 edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries; 248 edd.edd_info_nr = boot_params.eddbuf_entries; 249 } 250 #else 251 static inline void __init copy_edd(void) 252 { 253 } 254 #endif 255 256 void * __init extend_brk(size_t size, size_t align) 257 { 258 size_t mask = align - 1; 259 void *ret; 260 261 BUG_ON(_brk_start == 0); 262 BUG_ON(align & mask); 263 264 _brk_end = (_brk_end + mask) & ~mask; 265 BUG_ON((char *)(_brk_end + size) > __brk_limit); 266 267 ret = (void *)_brk_end; 268 _brk_end += size; 269 270 memset(ret, 0, size); 271 272 return ret; 273 } 274 275 #ifdef CONFIG_X86_32 276 static void __init cleanup_highmap(void) 277 { 278 } 279 #endif 280 281 static void __init reserve_brk(void) 282 { 283 if (_brk_end > _brk_start) 284 memblock_reserve_kern(__pa_symbol(_brk_start), 285 _brk_end - _brk_start); 286 287 /* Mark brk area as locked down and no longer taking any 288 new allocations */ 289 _brk_start = 0; 290 } 291 292 #ifdef CONFIG_BLK_DEV_INITRD 293 294 static u64 __init get_ramdisk_image(void) 295 { 296 u64 ramdisk_image = boot_params.hdr.ramdisk_image; 297 298 ramdisk_image |= (u64)boot_params.ext_ramdisk_image << 32; 299 300 if (ramdisk_image == 0) 301 ramdisk_image = phys_initrd_start; 302 303 return ramdisk_image; 304 } 305 static u64 __init get_ramdisk_size(void) 306 { 307 u64 ramdisk_size = boot_params.hdr.ramdisk_size; 308 309 ramdisk_size |= (u64)boot_params.ext_ramdisk_size << 32; 310 311 if (ramdisk_size == 0) 312 ramdisk_size = phys_initrd_size; 313 314 return ramdisk_size; 315 } 316 317 static void __init relocate_initrd(void) 318 { 319 /* Assume only end is not page aligned */ 320 u64 ramdisk_image = get_ramdisk_image(); 321 u64 ramdisk_size = get_ramdisk_size(); 322 u64 area_size = PAGE_ALIGN(ramdisk_size); 323 int ret = 0; 324 325 /* We need to move the initrd down into directly mapped mem */ 326 u64 relocated_ramdisk = memblock_phys_alloc_range(area_size, PAGE_SIZE, 0, 327 PFN_PHYS(max_pfn_mapped)); 328 if (!relocated_ramdisk) 329 panic("Cannot find place for new RAMDISK of size %lld\n", 330 ramdisk_size); 331 332 initrd_start = relocated_ramdisk + PAGE_OFFSET; 333 initrd_end = initrd_start + ramdisk_size; 334 printk(KERN_INFO "Allocated new RAMDISK: [mem %#010llx-%#010llx]\n", 335 relocated_ramdisk, relocated_ramdisk + ramdisk_size - 1); 336 337 ret = copy_from_early_mem((void *)initrd_start, ramdisk_image, ramdisk_size); 338 if (ret) 339 panic("Copy RAMDISK failed\n"); 340 341 printk(KERN_INFO "Move RAMDISK from [mem %#010llx-%#010llx] to" 342 " [mem %#010llx-%#010llx]\n", 343 ramdisk_image, ramdisk_image + ramdisk_size - 1, 344 relocated_ramdisk, relocated_ramdisk + ramdisk_size - 1); 345 } 346 347 static void __init early_reserve_initrd(void) 348 { 349 /* Assume only end is not page aligned */ 350 u64 ramdisk_image = get_ramdisk_image(); 351 u64 ramdisk_size = get_ramdisk_size(); 352 u64 ramdisk_end = PAGE_ALIGN(ramdisk_image + ramdisk_size); 353 354 if (!boot_params.hdr.type_of_loader || 355 !ramdisk_image || !ramdisk_size) 356 return; /* No initrd provided by bootloader */ 357 358 memblock_reserve_kern(ramdisk_image, ramdisk_end - ramdisk_image); 359 } 360 361 static void __init reserve_initrd(void) 362 { 363 /* Assume only end is not page aligned */ 364 u64 ramdisk_image = get_ramdisk_image(); 365 u64 ramdisk_size = get_ramdisk_size(); 366 u64 ramdisk_end = PAGE_ALIGN(ramdisk_image + ramdisk_size); 367 368 if (!boot_params.hdr.type_of_loader || 369 !ramdisk_image || !ramdisk_size) 370 return; /* No initrd provided by bootloader */ 371 372 initrd_start = 0; 373 374 printk(KERN_INFO "RAMDISK: [mem %#010llx-%#010llx]\n", ramdisk_image, 375 ramdisk_end - 1); 376 377 if (pfn_range_is_mapped(PFN_DOWN(ramdisk_image), 378 PFN_DOWN(ramdisk_end))) { 379 /* All are mapped, easy case */ 380 initrd_start = ramdisk_image + PAGE_OFFSET; 381 initrd_end = initrd_start + ramdisk_size; 382 return; 383 } 384 385 relocate_initrd(); 386 387 memblock_phys_free(ramdisk_image, ramdisk_end - ramdisk_image); 388 } 389 390 #else 391 static void __init early_reserve_initrd(void) 392 { 393 } 394 static void __init reserve_initrd(void) 395 { 396 } 397 #endif /* CONFIG_BLK_DEV_INITRD */ 398 399 static void __init add_early_ima_buffer(u64 phys_addr) 400 { 401 #ifdef CONFIG_IMA 402 struct ima_setup_data *data; 403 404 data = early_memremap(phys_addr + sizeof(struct setup_data), sizeof(*data)); 405 if (!data) { 406 pr_warn("setup: failed to memremap ima_setup_data entry\n"); 407 return; 408 } 409 410 if (data->size) { 411 memblock_reserve_kern(data->addr, data->size); 412 ima_kexec_buffer_phys = data->addr; 413 ima_kexec_buffer_size = data->size; 414 } 415 416 early_memunmap(data, sizeof(*data)); 417 #else 418 pr_warn("Passed IMA kexec data, but CONFIG_IMA not set. Ignoring.\n"); 419 #endif 420 } 421 422 #if defined(CONFIG_HAVE_IMA_KEXEC) && !defined(CONFIG_OF_FLATTREE) 423 int __init ima_free_kexec_buffer(void) 424 { 425 if (!ima_kexec_buffer_size) 426 return -ENOENT; 427 428 memblock_phys_free(ima_kexec_buffer_phys, 429 ima_kexec_buffer_size); 430 431 ima_kexec_buffer_phys = 0; 432 ima_kexec_buffer_size = 0; 433 434 return 0; 435 } 436 437 int __init ima_get_kexec_buffer(void **addr, size_t *size) 438 { 439 int ret; 440 441 if (!ima_kexec_buffer_size) 442 return -ENOENT; 443 444 ret = ima_validate_range(ima_kexec_buffer_phys, ima_kexec_buffer_size); 445 if (ret) 446 return ret; 447 448 *addr = __va(ima_kexec_buffer_phys); 449 *size = ima_kexec_buffer_size; 450 451 return 0; 452 } 453 #endif 454 455 static void __init add_kho(u64 phys_addr, u32 data_len) 456 { 457 struct kho_data *kho; 458 u64 addr = phys_addr + sizeof(struct setup_data); 459 u64 size = data_len - sizeof(struct setup_data); 460 461 if (!IS_ENABLED(CONFIG_KEXEC_HANDOVER)) { 462 pr_warn("Passed KHO data, but CONFIG_KEXEC_HANDOVER not set. Ignoring.\n"); 463 return; 464 } 465 466 kho = early_memremap(addr, size); 467 if (!kho) { 468 pr_warn("setup: failed to memremap kho data (0x%llx, 0x%llx)\n", 469 addr, size); 470 return; 471 } 472 473 kho_populate(kho->fdt_addr, kho->fdt_size, kho->scratch_addr, kho->scratch_size); 474 475 early_memunmap(kho, size); 476 } 477 478 static void __init parse_setup_data(void) 479 { 480 struct setup_data *data; 481 u64 pa_data, pa_next; 482 483 pa_data = boot_params.hdr.setup_data; 484 while (pa_data) { 485 u32 data_len, data_type; 486 487 data = early_memremap(pa_data, sizeof(*data)); 488 data_len = data->len + sizeof(struct setup_data); 489 data_type = data->type; 490 pa_next = data->next; 491 early_memunmap(data, sizeof(*data)); 492 493 switch (data_type) { 494 case SETUP_E820_EXT: 495 e820__memory_setup_extended(pa_data, data_len); 496 break; 497 case SETUP_DTB: 498 add_dtb(pa_data); 499 break; 500 case SETUP_EFI: 501 parse_efi_setup(pa_data, data_len); 502 break; 503 case SETUP_IMA: 504 add_early_ima_buffer(pa_data); 505 break; 506 case SETUP_KEXEC_KHO: 507 add_kho(pa_data, data_len); 508 break; 509 case SETUP_RNG_SEED: 510 data = early_memremap(pa_data, data_len); 511 add_bootloader_randomness(data->data, data->len); 512 /* Zero seed for forward secrecy. */ 513 memzero_explicit(data->data, data->len); 514 /* Zero length in case we find ourselves back here by accident. */ 515 memzero_explicit(&data->len, sizeof(data->len)); 516 early_memunmap(data, data_len); 517 break; 518 default: 519 break; 520 } 521 pa_data = pa_next; 522 } 523 } 524 525 /* 526 * Translate the fields of 'struct boot_param' into global variables 527 * representing these parameters. 528 */ 529 static void __init parse_boot_params(void) 530 { 531 ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev); 532 sysfb_primary_display.screen = boot_params.screen_info; 533 #if defined(CONFIG_FIRMWARE_EDID) 534 sysfb_primary_display.edid = boot_params.edid_info; 535 #endif 536 #ifdef CONFIG_X86_32 537 apm_info.bios = boot_params.apm_bios_info; 538 ist_info = boot_params.ist_info; 539 #endif 540 saved_video_mode = boot_params.hdr.vid_mode; 541 bootloader_type = boot_params.hdr.type_of_loader; 542 if ((bootloader_type >> 4) == 0xe) { 543 bootloader_type &= 0xf; 544 bootloader_type |= (boot_params.hdr.ext_loader_type+0x10) << 4; 545 } 546 bootloader_version = bootloader_type & 0xf; 547 bootloader_version |= boot_params.hdr.ext_loader_ver << 4; 548 549 #ifdef CONFIG_BLK_DEV_RAM 550 rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK; 551 #endif 552 #ifdef CONFIG_EFI 553 if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature, 554 EFI32_LOADER_SIGNATURE, 4)) { 555 set_bit(EFI_BOOT, &efi.flags); 556 } else if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature, 557 EFI64_LOADER_SIGNATURE, 4)) { 558 set_bit(EFI_BOOT, &efi.flags); 559 set_bit(EFI_64BIT, &efi.flags); 560 } 561 #endif 562 563 if (!boot_params.hdr.root_flags) 564 root_mountflags &= ~MS_RDONLY; 565 } 566 567 static void __init memblock_x86_reserve_range_setup_data(void) 568 { 569 struct setup_indirect *indirect; 570 struct setup_data *data; 571 u64 pa_data, pa_next; 572 u32 len; 573 574 pa_data = boot_params.hdr.setup_data; 575 while (pa_data) { 576 data = early_memremap(pa_data, sizeof(*data)); 577 if (!data) { 578 pr_warn("setup: failed to memremap setup_data entry\n"); 579 return; 580 } 581 582 len = sizeof(*data); 583 pa_next = data->next; 584 585 memblock_reserve_kern(pa_data, sizeof(*data) + data->len); 586 587 if (data->type == SETUP_INDIRECT) { 588 len += data->len; 589 early_memunmap(data, sizeof(*data)); 590 data = early_memremap(pa_data, len); 591 if (!data) { 592 pr_warn("setup: failed to memremap indirect setup_data\n"); 593 return; 594 } 595 596 indirect = (struct setup_indirect *)data->data; 597 598 if (indirect->type != SETUP_INDIRECT) 599 memblock_reserve_kern(indirect->addr, indirect->len); 600 } 601 602 pa_data = pa_next; 603 early_memunmap(data, len); 604 } 605 } 606 607 static void __init arch_reserve_crashkernel(void) 608 { 609 unsigned long long crash_base, crash_size, low_size = 0, cma_size = 0; 610 bool high = false; 611 int ret; 612 613 if (!IS_ENABLED(CONFIG_CRASH_RESERVE)) 614 return; 615 616 ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(), 617 &crash_size, &crash_base, 618 &low_size, &cma_size, &high); 619 if (ret) 620 return; 621 622 if (xen_pv_domain()) { 623 pr_info("Ignoring crashkernel for a Xen PV domain\n"); 624 return; 625 } 626 627 reserve_crashkernel_generic(crash_size, crash_base, low_size, high); 628 reserve_crashkernel_cma(cma_size); 629 } 630 631 static struct resource standard_io_resources[] = { 632 { .name = "dma1", .start = 0x00, .end = 0x1f, 633 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 634 { .name = "pic1", .start = 0x20, .end = 0x21, 635 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 636 { .name = "timer0", .start = 0x40, .end = 0x43, 637 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 638 { .name = "timer1", .start = 0x50, .end = 0x53, 639 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 640 { .name = "keyboard", .start = 0x60, .end = 0x60, 641 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 642 { .name = "keyboard", .start = 0x64, .end = 0x64, 643 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 644 { .name = "dma page reg", .start = 0x80, .end = 0x8f, 645 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 646 { .name = "pic2", .start = 0xa0, .end = 0xa1, 647 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 648 { .name = "dma2", .start = 0xc0, .end = 0xdf, 649 .flags = IORESOURCE_BUSY | IORESOURCE_IO }, 650 { .name = "fpu", .start = 0xf0, .end = 0xff, 651 .flags = IORESOURCE_BUSY | IORESOURCE_IO } 652 }; 653 654 void __init reserve_standard_io_resources(void) 655 { 656 int i; 657 658 /* request I/O space for devices used on all i[345]86 PCs */ 659 for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++) 660 request_resource(&ioport_resource, &standard_io_resources[i]); 661 662 } 663 664 static void __init setup_kernel_resources(void) 665 { 666 code_resource.start = __pa_symbol(_text); 667 code_resource.end = __pa_symbol(_etext)-1; 668 rodata_resource.start = __pa_symbol(__start_rodata); 669 rodata_resource.end = __pa_symbol(__end_rodata)-1; 670 data_resource.start = __pa_symbol(_sdata); 671 data_resource.end = __pa_symbol(_edata)-1; 672 bss_resource.start = __pa_symbol(__bss_start); 673 bss_resource.end = __pa_symbol(__bss_stop)-1; 674 675 insert_resource(&iomem_resource, &code_resource); 676 insert_resource(&iomem_resource, &rodata_resource); 677 insert_resource(&iomem_resource, &data_resource); 678 insert_resource(&iomem_resource, &bss_resource); 679 } 680 681 static bool __init snb_gfx_workaround_needed(void) 682 { 683 #ifdef CONFIG_PCI 684 int i; 685 u16 vendor, devid; 686 static const __initconst u16 snb_ids[] = { 687 0x0102, 688 0x0112, 689 0x0122, 690 0x0106, 691 0x0116, 692 0x0126, 693 0x010a, 694 }; 695 696 /* Assume no if something weird is going on with PCI */ 697 if (!early_pci_allowed()) 698 return false; 699 700 vendor = read_pci_config_16(0, 2, 0, PCI_VENDOR_ID); 701 if (vendor != 0x8086) 702 return false; 703 704 devid = read_pci_config_16(0, 2, 0, PCI_DEVICE_ID); 705 for (i = 0; i < ARRAY_SIZE(snb_ids); i++) 706 if (devid == snb_ids[i]) 707 return true; 708 #endif 709 710 return false; 711 } 712 713 /* 714 * Sandy Bridge graphics has trouble with certain ranges, exclude 715 * them from allocation. 716 */ 717 static void __init trim_snb_memory(void) 718 { 719 static const __initconst unsigned long bad_pages[] = { 720 0x20050000, 721 0x20110000, 722 0x20130000, 723 0x20138000, 724 0x40004000, 725 }; 726 int i; 727 728 if (!snb_gfx_workaround_needed()) 729 return; 730 731 printk(KERN_DEBUG "reserving inaccessible SNB gfx pages\n"); 732 733 /* 734 * SandyBridge integrated graphics devices have a bug that prevents 735 * them from accessing certain memory ranges, namely anything below 736 * 1M and in the pages listed in bad_pages[] above. 737 * 738 * To avoid these pages being ever accessed by SNB gfx devices reserve 739 * bad_pages that have not already been reserved at boot time. 740 * All memory below the 1 MB mark is anyway reserved later during 741 * setup_arch(), so there is no need to reserve it here. 742 */ 743 744 for (i = 0; i < ARRAY_SIZE(bad_pages); i++) { 745 if (memblock_reserve(bad_pages[i], PAGE_SIZE)) 746 printk(KERN_WARNING "failed to reserve 0x%08lx\n", 747 bad_pages[i]); 748 } 749 } 750 751 static void __init trim_bios_range(void) 752 { 753 /* 754 * A special case is the first 4Kb of memory; 755 * This is a BIOS owned area, not kernel ram, but generally 756 * not listed as such in the E820 table. 757 * 758 * This typically reserves additional memory (64KiB by default) 759 * since some BIOSes are known to corrupt low memory. See the 760 * Kconfig help text for X86_RESERVE_LOW. 761 */ 762 e820__range_update(0, PAGE_SIZE, E820_TYPE_RAM, E820_TYPE_RESERVED); 763 764 /* 765 * special case: Some BIOSes report the PC BIOS 766 * area (640Kb -> 1Mb) as RAM even though it is not. 767 * take them out. 768 */ 769 e820__range_remove(BIOS_BEGIN, BIOS_END - BIOS_BEGIN, E820_TYPE_RAM); 770 771 e820__update_table(e820_table); 772 } 773 774 /* called before trim_bios_range() to spare extra sanitize */ 775 static void __init e820_add_kernel_range(void) 776 { 777 u64 start = __pa_symbol(_text); 778 u64 size = __pa_symbol(_end) - start; 779 780 /* 781 * Complain if .text .data and .bss are not marked as E820_TYPE_RAM and 782 * attempt to fix it by adding the range. We may have a confused BIOS, 783 * or the user may have used memmap=exactmap or memmap=xxM$yyM to 784 * exclude kernel range. If we really are running on top non-RAM, 785 * we will crash later anyways. 786 */ 787 if (e820__mapped_all(start, start + size, E820_TYPE_RAM)) 788 return; 789 790 pr_warn(".text .data .bss are not marked as E820_TYPE_RAM!\n"); 791 e820__range_remove(start, size, 0); 792 e820__range_add(start, size, E820_TYPE_RAM); 793 } 794 795 static void __init early_reserve_memory(void) 796 { 797 /* 798 * Reserve the memory occupied by the kernel between _text and 799 * __end_of_kernel_reserve symbols. Any kernel sections after the 800 * __end_of_kernel_reserve symbol must be explicitly reserved with a 801 * separate memblock_reserve() or they will be discarded. 802 */ 803 memblock_reserve_kern(__pa_symbol(_text), 804 (unsigned long)__end_of_kernel_reserve - (unsigned long)_text); 805 806 /* 807 * The first 4Kb of memory is a BIOS owned area, but generally it is 808 * not listed as such in the E820 table. 809 * 810 * Reserve the first 64K of memory since some BIOSes are known to 811 * corrupt low memory. After the real mode trampoline is allocated the 812 * rest of the memory below 640k is reserved. 813 * 814 * In addition, make sure page 0 is always reserved because on 815 * systems with L1TF its contents can be leaked to user processes. 816 */ 817 memblock_reserve(0, SZ_64K); 818 819 early_reserve_initrd(); 820 821 memblock_x86_reserve_range_setup_data(); 822 823 reserve_bios_regions(); 824 trim_snb_memory(); 825 } 826 827 /* 828 * Dump out kernel offset information on panic. 829 */ 830 static int 831 dump_kernel_offset(struct notifier_block *self, unsigned long v, void *p) 832 { 833 if (kaslr_enabled()) { 834 pr_emerg("Kernel Offset: 0x%lx from 0x%lx (relocation range: 0x%lx-0x%lx)\n", 835 kaslr_offset(), 836 __START_KERNEL, 837 __START_KERNEL_map, 838 MODULES_VADDR-1); 839 } else { 840 pr_emerg("Kernel Offset: disabled\n"); 841 } 842 843 return 0; 844 } 845 846 void x86_configure_nx(void) 847 { 848 if (boot_cpu_has(X86_FEATURE_NX)) 849 __supported_pte_mask |= _PAGE_NX; 850 else 851 __supported_pte_mask &= ~_PAGE_NX; 852 } 853 854 static void __init x86_report_nx(void) 855 { 856 if (!boot_cpu_has(X86_FEATURE_NX)) { 857 printk(KERN_NOTICE "Notice: NX (Execute Disable) protection " 858 "missing in CPU!\n"); 859 } else { 860 #if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE) 861 printk(KERN_INFO "NX (Execute Disable) protection: active\n"); 862 #else 863 /* 32bit non-PAE kernel, NX cannot be used */ 864 printk(KERN_NOTICE "Notice: NX (Execute Disable) protection " 865 "cannot be enabled: non-PAE kernel!\n"); 866 #endif 867 } 868 } 869 870 /* 871 * Determine if we were loaded by an EFI loader. If so, then we have also been 872 * passed the efi memmap, systab, etc., so we should use these data structures 873 * for initialization. Note, the efi init code path is determined by the 874 * global efi_enabled. This allows the same kernel image to be used on existing 875 * systems (with a traditional BIOS) as well as on EFI systems. 876 */ 877 /* 878 * setup_arch - architecture-specific boot-time initializations 879 * 880 * Note: On x86_64, fixmaps are ready for use even before this is called. 881 */ 882 883 void __init setup_arch(char **cmdline_p) 884 { 885 #ifdef CONFIG_X86_32 886 memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data)); 887 888 /* 889 * copy kernel address range established so far and switch 890 * to the proper swapper page table 891 */ 892 clone_pgd_range(swapper_pg_dir + KERNEL_PGD_BOUNDARY, 893 initial_page_table + KERNEL_PGD_BOUNDARY, 894 KERNEL_PGD_PTRS); 895 896 load_cr3(swapper_pg_dir); 897 /* 898 * Note: Quark X1000 CPUs advertise PGE incorrectly and require 899 * a cr3 based tlb flush, so the following __flush_tlb_all() 900 * will not flush anything because the CPU quirk which clears 901 * X86_FEATURE_PGE has not been invoked yet. Though due to the 902 * load_cr3() above the TLB has been flushed already. The 903 * quirk is invoked before subsequent calls to __flush_tlb_all() 904 * so proper operation is guaranteed. 905 */ 906 __flush_tlb_all(); 907 #else 908 printk(KERN_INFO "Command line: %s\n", boot_command_line); 909 boot_cpu_data.x86_phys_bits = MAX_PHYSMEM_BITS; 910 #endif 911 912 #ifdef CONFIG_CMDLINE_BOOL 913 #ifdef CONFIG_CMDLINE_OVERRIDE 914 strscpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE); 915 #else 916 if (builtin_cmdline[0]) { 917 /* append boot loader cmdline to builtin */ 918 strlcat(builtin_cmdline, " ", COMMAND_LINE_SIZE); 919 strlcat(builtin_cmdline, boot_command_line, COMMAND_LINE_SIZE); 920 strscpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE); 921 } 922 #endif 923 builtin_cmdline_added = true; 924 #endif 925 926 strscpy(command_line, boot_command_line, COMMAND_LINE_SIZE); 927 *cmdline_p = command_line; 928 929 /* 930 * If we have OLPC OFW, we might end up relocating the fixmap due to 931 * reserve_top(), so do this before touching the ioremap area. 932 */ 933 olpc_ofw_detect(); 934 935 idt_setup_early_traps(); 936 early_cpu_init(); 937 jump_label_init(); 938 static_call_init(); 939 early_ioremap_init(); 940 941 setup_olpc_ofw_pgd(); 942 943 parse_boot_params(); 944 945 x86_init.oem.arch_setup(); 946 947 /* 948 * Do some memory reservations *before* memory is added to memblock, so 949 * memblock allocations won't overwrite it. 950 * 951 * After this point, everything still needed from the boot loader or 952 * firmware or kernel text should be early reserved or marked not RAM in 953 * e820. All other memory is free game. 954 * 955 * This call needs to happen before e820__memory_setup() which calls the 956 * xen_memory_setup() on Xen dom0 which relies on the fact that those 957 * early reservations have happened already. 958 */ 959 early_reserve_memory(); 960 961 iomem_resource.end = (1ULL << boot_cpu_data.x86_phys_bits) - 1; 962 e820__memory_setup(); 963 parse_setup_data(); 964 965 copy_edd(); 966 967 setup_initial_init_mm(_text, _etext, _edata, (void *)_brk_end); 968 969 /* 970 * x86_configure_nx() is called before parse_early_param() to detect 971 * whether hardware doesn't support NX (so that the early EHCI debug 972 * console setup can safely call set_fixmap()). 973 */ 974 x86_configure_nx(); 975 976 parse_early_param(); 977 978 if (efi_enabled(EFI_BOOT)) 979 efi_memblock_x86_reserve_range(); 980 981 x86_report_nx(); 982 983 apic_setup_apic_calls(); 984 985 if (acpi_mps_check()) { 986 #ifdef CONFIG_X86_LOCAL_APIC 987 apic_is_disabled = true; 988 #endif 989 setup_clear_cpu_cap(X86_FEATURE_APIC); 990 } 991 992 e820__finish_early_params(); 993 994 if (efi_enabled(EFI_BOOT)) 995 efi_init(); 996 997 reserve_ibft_region(); 998 x86_init.resources.dmi_setup(); 999 1000 /* 1001 * VMware detection requires dmi to be available, so this 1002 * needs to be done after dmi_setup(), for the boot CPU. 1003 * For some guest types (Xen PV, SEV-SNP, TDX) it is required to be 1004 * called before cache_bp_init() for setting up MTRR state. 1005 */ 1006 init_hypervisor_platform(); 1007 1008 tsc_early_init(); 1009 x86_init.resources.probe_roms(); 1010 1011 /* 1012 * Add resources for kernel text and data to the iomem_resource. 1013 * Do it after parse_early_param, so it can be debugged. 1014 */ 1015 setup_kernel_resources(); 1016 1017 e820_add_kernel_range(); 1018 trim_bios_range(); 1019 #ifdef CONFIG_X86_32 1020 if (ppro_with_ram_bug()) { 1021 pr_info("Applying PPro RAM bug workaround: punching 256 kB hole at 1.75 GB physical.\n"); 1022 e820__range_update(0x70000000ULL, SZ_256K, E820_TYPE_RAM, E820_TYPE_RESERVED); 1023 e820__update_table(e820_table); 1024 } 1025 #else 1026 early_gart_iommu_check(); 1027 #endif 1028 1029 /* 1030 * partially used pages are not usable - thus 1031 * we are rounding upwards: 1032 */ 1033 max_pfn = e820__end_of_ram_pfn(); 1034 1035 /* update e820 for memory not covered by WB MTRRs */ 1036 cache_bp_init(); 1037 if (mtrr_trim_uncached_memory(max_pfn)) 1038 max_pfn = e820__end_of_ram_pfn(); 1039 1040 max_possible_pfn = max_pfn; 1041 1042 /* 1043 * Define random base addresses for memory sections after max_pfn is 1044 * defined and before each memory section base is used. 1045 */ 1046 kernel_randomize_memory(); 1047 1048 #ifdef CONFIG_X86_32 1049 /* max_low_pfn get updated here */ 1050 find_low_pfn_range(); 1051 #else 1052 check_x2apic(); 1053 1054 /* How many end-of-memory variables you have, grandma! */ 1055 /* need this before calling reserve_initrd */ 1056 if (max_pfn > (1UL<<(32 - PAGE_SHIFT))) 1057 max_low_pfn = e820__end_of_low_ram_pfn(); 1058 else 1059 max_low_pfn = max_pfn; 1060 #endif 1061 1062 /* Find and reserve MPTABLE area */ 1063 x86_init.mpparse.find_mptable(); 1064 1065 early_alloc_pgt_buf(); 1066 1067 /* 1068 * Need to conclude brk, before e820__memblock_setup() 1069 * it could use memblock_find_in_range, could overlap with 1070 * brk area. 1071 */ 1072 reserve_brk(); 1073 1074 cleanup_highmap(); 1075 1076 e820__memblock_setup(); 1077 1078 /* 1079 * Needs to run after memblock setup because it needs the physical 1080 * memory size. 1081 */ 1082 mem_encrypt_setup_arch(); 1083 cc_random_init(); 1084 1085 efi_find_mirror(); 1086 efi_esrt_init(); 1087 efi_mokvar_table_init(); 1088 1089 /* 1090 * The EFI specification says that boot service code won't be 1091 * called after ExitBootServices(). This is, in fact, a lie. 1092 */ 1093 efi_reserve_boot_services(); 1094 1095 /* preallocate 4k for mptable mpc */ 1096 e820__memblock_alloc_reserved_mpc_new(); 1097 1098 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION 1099 setup_bios_corruption_check(); 1100 #endif 1101 1102 #ifdef CONFIG_X86_32 1103 printk(KERN_DEBUG "initial memory mapped: [mem 0x00000000-%#010lx]\n", 1104 (max_pfn_mapped<<PAGE_SHIFT) - 1); 1105 #endif 1106 1107 /* 1108 * Find free memory for the real mode trampoline and place it there. If 1109 * there is not enough free memory under 1M, on EFI-enabled systems 1110 * there will be additional attempt to reclaim the memory for the real 1111 * mode trampoline at efi_free_boot_services(). 1112 * 1113 * Unconditionally reserve the entire first 1M of RAM because BIOSes 1114 * are known to corrupt low memory and several hundred kilobytes are not 1115 * worth complex detection what memory gets clobbered. Windows does the 1116 * same thing for very similar reasons. 1117 * 1118 * Moreover, on machines with SandyBridge graphics or in setups that use 1119 * crashkernel the entire 1M is reserved anyway. 1120 * 1121 * Note the host kernel TDX also requires the first 1MB being reserved. 1122 */ 1123 x86_platform.realmode_reserve(); 1124 1125 init_mem_mapping(); 1126 1127 /* 1128 * init_mem_mapping() relies on the early IDT page fault handling. 1129 * Now either enable FRED or install the real page fault handler 1130 * for 64-bit in the IDT. 1131 */ 1132 cpu_init_replace_early_idt(); 1133 1134 /* 1135 * Update mmu_cr4_features (and, indirectly, trampoline_cr4_features) 1136 * with the current CR4 value. This may not be necessary, but 1137 * auditing all the early-boot CR4 manipulation would be needed to 1138 * rule it out. 1139 * 1140 * Mask off features that don't work outside long mode (just 1141 * PCIDE for now). 1142 */ 1143 mmu_cr4_features = __read_cr4() & ~X86_CR4_PCIDE; 1144 1145 memblock_set_current_limit(get_max_mapped()); 1146 1147 /* 1148 * NOTE: On x86-32, only from this point on, fixmaps are ready for use. 1149 */ 1150 1151 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT 1152 if (init_ohci1394_dma_early) 1153 init_ohci1394_dma_on_all_controllers(); 1154 #endif 1155 /* Allocate bigger log buffer */ 1156 setup_log_buf(1); 1157 1158 if (efi_enabled(EFI_BOOT)) { 1159 switch (boot_params.secure_boot) { 1160 case efi_secureboot_mode_disabled: 1161 pr_info("Secure boot disabled\n"); 1162 break; 1163 case efi_secureboot_mode_enabled: 1164 pr_info("Secure boot enabled\n"); 1165 break; 1166 default: 1167 pr_info("Secure boot could not be determined\n"); 1168 break; 1169 } 1170 } 1171 1172 reserve_initrd(); 1173 1174 acpi_table_upgrade(); 1175 /* Look for ACPI tables and reserve memory occupied by them. */ 1176 acpi_boot_table_init(); 1177 1178 vsmp_init(); 1179 1180 io_delay_init(); 1181 1182 early_platform_quirks(); 1183 1184 /* Some platforms need the APIC registered for NUMA configuration */ 1185 early_acpi_boot_init(); 1186 x86_init.mpparse.early_parse_smp_cfg(); 1187 1188 x86_flattree_get_config(); 1189 1190 initmem_init(); 1191 dma_contiguous_reserve(max_pfn_mapped << PAGE_SHIFT); 1192 1193 /* 1194 * Reserve memory for crash kernel after SRAT is parsed so that it 1195 * won't consume hotpluggable memory. 1196 */ 1197 arch_reserve_crashkernel(); 1198 1199 if (!early_xdbc_setup_hardware()) 1200 early_xdbc_register_console(); 1201 1202 x86_init.paging.pagetable_init(); 1203 1204 kasan_init(); 1205 1206 /* 1207 * Sync back kernel address range. 1208 * 1209 * FIXME: Can the later sync in setup_cpu_entry_areas() replace 1210 * this call? 1211 */ 1212 sync_initial_page_table(); 1213 1214 tboot_probe(); 1215 1216 map_vsyscall(); 1217 1218 x86_32_probe_apic(); 1219 1220 early_quirks(); 1221 1222 topology_apply_cmdline_limits_early(); 1223 1224 /* 1225 * Parse SMP configuration. Try ACPI first and then the platform 1226 * specific parser. 1227 */ 1228 acpi_boot_init(); 1229 x86_init.mpparse.parse_smp_cfg(); 1230 1231 /* Last opportunity to detect and map the local APIC */ 1232 init_apic_mappings(); 1233 1234 topology_init_possible_cpus(); 1235 1236 init_cpu_to_node(); 1237 init_gi_nodes(); 1238 1239 io_apic_init_mappings(); 1240 1241 x86_init.hyper.guest_late_init(); 1242 1243 e820__reserve_resources(); 1244 e820__register_nosave_regions(max_pfn); 1245 1246 x86_init.resources.reserve_resources(); 1247 1248 e820__setup_pci_gap(); 1249 1250 #ifdef CONFIG_VT 1251 #if defined(CONFIG_VGA_CONSOLE) 1252 if (!efi_enabled(EFI_BOOT) || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY)) 1253 vgacon_register_screen(&sysfb_primary_display.screen); 1254 #endif 1255 #endif 1256 x86_init.oem.banner(); 1257 1258 x86_init.timers.wallclock_init(); 1259 1260 /* 1261 * This needs to run before setup_local_APIC() which soft-disables the 1262 * local APIC temporarily and that masks the thermal LVT interrupt, 1263 * leading to softlockups on machines which have configured SMI 1264 * interrupt delivery. 1265 */ 1266 therm_lvt_init(); 1267 1268 mcheck_init(); 1269 1270 register_refined_jiffies(PIT_TICK_RATE); 1271 1272 #ifdef CONFIG_EFI 1273 if (efi_enabled(EFI_BOOT)) 1274 efi_apply_memmap_quirks(); 1275 #endif 1276 1277 unwind_init(); 1278 } 1279 1280 #ifdef CONFIG_X86_32 1281 1282 static struct resource video_ram_resource = { 1283 .name = "Video RAM area", 1284 .start = 0xa0000, 1285 .end = 0xbffff, 1286 .flags = IORESOURCE_BUSY | IORESOURCE_MEM 1287 }; 1288 1289 void __init i386_reserve_resources(void) 1290 { 1291 request_resource(&iomem_resource, &video_ram_resource); 1292 reserve_standard_io_resources(); 1293 } 1294 1295 #endif /* CONFIG_X86_32 */ 1296 1297 static struct notifier_block kernel_offset_notifier = { 1298 .notifier_call = dump_kernel_offset 1299 }; 1300 1301 static int __init register_kernel_offset_dumper(void) 1302 { 1303 atomic_notifier_chain_register(&panic_notifier_list, 1304 &kernel_offset_notifier); 1305 return 0; 1306 } 1307 __initcall(register_kernel_offset_dumper); 1308 1309 #ifdef CONFIG_HOTPLUG_CPU 1310 bool arch_cpu_is_hotpluggable(int cpu) 1311 { 1312 return cpu > 0; 1313 } 1314 #endif /* CONFIG_HOTPLUG_CPU */ 1315