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/crash_dump.h>
  11#include <linux/dma-map-ops.h>
  12#include <linux/dmi.h>
  13#include <linux/efi.h>
  14#include <linux/ima.h>
  15#include <linux/init_ohci1394_dma.h>
  16#include <linux/initrd.h>
  17#include <linux/iscsi_ibft.h>
  18#include <linux/memblock.h>
  19#include <linux/panic_notifier.h>
 
 
  20#include <linux/pci.h>
  21#include <linux/root_dev.h>
  22#include <linux/hugetlb.h>
  23#include <linux/tboot.h>
  24#include <linux/usb/xhci-dbgp.h>
  25#include <linux/static_call.h>
  26#include <linux/swiotlb.h>
  27#include <linux/random.h>
  28
  29#include <uapi/linux/mount.h>
 
 
 
 
 
 
 
 
 
 
 
 
  30
  31#include <xen/xen.h>
 
 
 
 
 
  32
 
  33#include <asm/apic.h>
 
 
 
 
  34#include <asm/efi.h>
  35#include <asm/numa.h>
 
 
 
 
 
  36#include <asm/bios_ebda.h>
 
 
  37#include <asm/bugs.h>
  38#include <asm/cacheinfo.h>
 
 
  39#include <asm/cpu.h>
  40#include <asm/efi.h>
 
 
  41#include <asm/gart.h>
 
 
 
 
  42#include <asm/hypervisor.h>
  43#include <asm/io_apic.h>
  44#include <asm/kasan.h>
  45#include <asm/kaslr.h>
  46#include <asm/mce.h>
  47#include <asm/memtype.h>
  48#include <asm/mtrr.h>
  49#include <asm/realmode.h>
  50#include <asm/olpc_ofw.h>
  51#include <asm/pci-direct.h>
 
 
 
 
 
 
  52#include <asm/prom.h>
  53#include <asm/proto.h>
  54#include <asm/thermal.h>
  55#include <asm/unwind.h>
  56#include <asm/vsyscall.h>
  57#include <linux/vmalloc.h>
  58
  59/*
  60 * max_low_pfn_mapped: highest directly mapped pfn < 4 GB
  61 * max_pfn_mapped:     highest directly mapped pfn > 4 GB
  62 *
  63 * The direct mapping only covers E820_TYPE_RAM regions, so the ranges and gaps are
  64 * represented by pfn_mapped[].
  65 */
  66unsigned long max_low_pfn_mapped;
  67unsigned long max_pfn_mapped;
  68
  69#ifdef CONFIG_DMI
  70RESERVE_BRK(dmi_alloc, 65536);
  71#endif
  72
  73
  74unsigned long _brk_start = (unsigned long)__brk_base;
  75unsigned long _brk_end   = (unsigned long)__brk_base;
 
 
 
 
 
 
 
 
 
 
 
 
  76
  77struct boot_params boot_params;
  78
  79/*
  80 * These are the four main kernel memory regions, we put them into
  81 * the resource tree so that kdump tools and other debugging tools
  82 * recover it:
  83 */
  84
  85static struct resource rodata_resource = {
  86	.name	= "Kernel rodata",
  87	.start	= 0,
  88	.end	= 0,
  89	.flags	= IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM
  90};
  91
  92static struct resource data_resource = {
  93	.name	= "Kernel data",
  94	.start	= 0,
  95	.end	= 0,
  96	.flags	= IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM
  97};
  98
  99static struct resource code_resource = {
 100	.name	= "Kernel code",
 101	.start	= 0,
 102	.end	= 0,
 103	.flags	= IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM
 104};
 105
 106static struct resource bss_resource = {
 107	.name	= "Kernel bss",
 108	.start	= 0,
 109	.end	= 0,
 110	.flags	= IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM
 111};
 112
 113
 114#ifdef CONFIG_X86_32
 115/* CPU data as detected by the assembly code in head_32.S */
 116struct cpuinfo_x86 new_cpu_data;
 117
 118/* Common CPU data for all CPUs */
 119struct cpuinfo_x86 boot_cpu_data __read_mostly;
 
 
 
 120EXPORT_SYMBOL(boot_cpu_data);
 121
 122unsigned int def_to_bigsmp;
 123
 
 
 
 
 
 124struct apm_info apm_info;
 125EXPORT_SYMBOL(apm_info);
 126
 127#if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
 128	defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
 129struct ist_info ist_info;
 130EXPORT_SYMBOL(ist_info);
 131#else
 132struct ist_info ist_info;
 133#endif
 134
 135#else
 136struct cpuinfo_x86 boot_cpu_data __read_mostly;
 
 
 137EXPORT_SYMBOL(boot_cpu_data);
 138#endif
 139
 140
 141#if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64)
 142__visible unsigned long mmu_cr4_features __ro_after_init;
 143#else
 144__visible unsigned long mmu_cr4_features __ro_after_init = X86_CR4_PAE;
 145#endif
 146
 147#ifdef CONFIG_IMA
 148static phys_addr_t ima_kexec_buffer_phys;
 149static size_t ima_kexec_buffer_size;
 150#endif
 151
 152/* Boot loader ID and version as integers, for the benefit of proc_dointvec */
 153int bootloader_type, bootloader_version;
 154
 155/*
 156 * Setup options
 157 */
 158struct screen_info screen_info;
 159EXPORT_SYMBOL(screen_info);
 160struct edid_info edid_info;
 161EXPORT_SYMBOL_GPL(edid_info);
 162
 163extern int root_mountflags;
 164
 165unsigned long saved_video_mode;
 166
 167#define RAMDISK_IMAGE_START_MASK	0x07FF
 168#define RAMDISK_PROMPT_FLAG		0x8000
 169#define RAMDISK_LOAD_FLAG		0x4000
 170
 171static char __initdata command_line[COMMAND_LINE_SIZE];
 172#ifdef CONFIG_CMDLINE_BOOL
 173static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
 174#endif
 175
 176#if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
 177struct edd edd;
 178#ifdef CONFIG_EDD_MODULE
 179EXPORT_SYMBOL(edd);
 180#endif
 181/**
 182 * copy_edd() - Copy the BIOS EDD information
 183 *              from boot_params into a safe place.
 184 *
 185 */
 186static inline void __init copy_edd(void)
 187{
 188     memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer,
 189	    sizeof(edd.mbr_signature));
 190     memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
 191     edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
 192     edd.edd_info_nr = boot_params.eddbuf_entries;
 193}
 194#else
 195static inline void __init copy_edd(void)
 196{
 197}
 198#endif
 199
 200void * __init extend_brk(size_t size, size_t align)
 201{
 202	size_t mask = align - 1;
 203	void *ret;
 204
 205	BUG_ON(_brk_start == 0);
 206	BUG_ON(align & mask);
 207
 208	_brk_end = (_brk_end + mask) & ~mask;
 209	BUG_ON((char *)(_brk_end + size) > __brk_limit);
 210
 211	ret = (void *)_brk_end;
 212	_brk_end += size;
 213
 214	memset(ret, 0, size);
 215
 216	return ret;
 217}
 218
 219#ifdef CONFIG_X86_32
 220static void __init cleanup_highmap(void)
 221{
 222}
 223#endif
 224
 225static void __init reserve_brk(void)
 226{
 227	if (_brk_end > _brk_start)
 228		memblock_reserve(__pa_symbol(_brk_start),
 229				 _brk_end - _brk_start);
 230
 231	/* Mark brk area as locked down and no longer taking any
 232	   new allocations */
 233	_brk_start = 0;
 234}
 235
 236u64 relocated_ramdisk;
 237
 238#ifdef CONFIG_BLK_DEV_INITRD
 239
 240static u64 __init get_ramdisk_image(void)
 241{
 242	u64 ramdisk_image = boot_params.hdr.ramdisk_image;
 243
 244	ramdisk_image |= (u64)boot_params.ext_ramdisk_image << 32;
 245
 246	if (ramdisk_image == 0)
 247		ramdisk_image = phys_initrd_start;
 248
 249	return ramdisk_image;
 250}
 251static u64 __init get_ramdisk_size(void)
 252{
 253	u64 ramdisk_size = boot_params.hdr.ramdisk_size;
 254
 255	ramdisk_size |= (u64)boot_params.ext_ramdisk_size << 32;
 256
 257	if (ramdisk_size == 0)
 258		ramdisk_size = phys_initrd_size;
 259
 260	return ramdisk_size;
 261}
 262
 263static void __init relocate_initrd(void)
 264{
 265	/* Assume only end is not page aligned */
 266	u64 ramdisk_image = get_ramdisk_image();
 267	u64 ramdisk_size  = get_ramdisk_size();
 268	u64 area_size     = PAGE_ALIGN(ramdisk_size);
 269
 270	/* We need to move the initrd down into directly mapped mem */
 271	relocated_ramdisk = memblock_phys_alloc_range(area_size, PAGE_SIZE, 0,
 272						      PFN_PHYS(max_pfn_mapped));
 
 273	if (!relocated_ramdisk)
 274		panic("Cannot find place for new RAMDISK of size %lld\n",
 275		      ramdisk_size);
 276
 
 
 
 277	initrd_start = relocated_ramdisk + PAGE_OFFSET;
 278	initrd_end   = initrd_start + ramdisk_size;
 279	printk(KERN_INFO "Allocated new RAMDISK: [mem %#010llx-%#010llx]\n",
 280	       relocated_ramdisk, relocated_ramdisk + ramdisk_size - 1);
 281
 282	copy_from_early_mem((void *)initrd_start, ramdisk_image, ramdisk_size);
 283
 284	printk(KERN_INFO "Move RAMDISK from [mem %#010llx-%#010llx] to"
 285		" [mem %#010llx-%#010llx]\n",
 286		ramdisk_image, ramdisk_image + ramdisk_size - 1,
 287		relocated_ramdisk, relocated_ramdisk + ramdisk_size - 1);
 288}
 289
 290static void __init early_reserve_initrd(void)
 291{
 292	/* Assume only end is not page aligned */
 293	u64 ramdisk_image = get_ramdisk_image();
 294	u64 ramdisk_size  = get_ramdisk_size();
 295	u64 ramdisk_end   = PAGE_ALIGN(ramdisk_image + ramdisk_size);
 296
 297	if (!boot_params.hdr.type_of_loader ||
 298	    !ramdisk_image || !ramdisk_size)
 299		return;		/* No initrd provided by bootloader */
 300
 301	memblock_reserve(ramdisk_image, ramdisk_end - ramdisk_image);
 302}
 303
 304static void __init reserve_initrd(void)
 305{
 306	/* Assume only end is not page aligned */
 307	u64 ramdisk_image = get_ramdisk_image();
 308	u64 ramdisk_size  = get_ramdisk_size();
 309	u64 ramdisk_end   = PAGE_ALIGN(ramdisk_image + ramdisk_size);
 
 310
 311	if (!boot_params.hdr.type_of_loader ||
 312	    !ramdisk_image || !ramdisk_size)
 313		return;		/* No initrd provided by bootloader */
 314
 315	initrd_start = 0;
 316
 
 
 
 
 
 
 317	printk(KERN_INFO "RAMDISK: [mem %#010llx-%#010llx]\n", ramdisk_image,
 318			ramdisk_end - 1);
 319
 320	if (pfn_range_is_mapped(PFN_DOWN(ramdisk_image),
 321				PFN_DOWN(ramdisk_end))) {
 322		/* All are mapped, easy case */
 323		initrd_start = ramdisk_image + PAGE_OFFSET;
 324		initrd_end = initrd_start + ramdisk_size;
 325		return;
 326	}
 327
 328	relocate_initrd();
 329
 330	memblock_phys_free(ramdisk_image, ramdisk_end - ramdisk_image);
 331}
 332
 333#else
 334static void __init early_reserve_initrd(void)
 335{
 336}
 337static void __init reserve_initrd(void)
 338{
 339}
 340#endif /* CONFIG_BLK_DEV_INITRD */
 341
 342static void __init add_early_ima_buffer(u64 phys_addr)
 343{
 344#ifdef CONFIG_IMA
 345	struct ima_setup_data *data;
 346
 347	data = early_memremap(phys_addr + sizeof(struct setup_data), sizeof(*data));
 348	if (!data) {
 349		pr_warn("setup: failed to memremap ima_setup_data entry\n");
 350		return;
 351	}
 352
 353	if (data->size) {
 354		memblock_reserve(data->addr, data->size);
 355		ima_kexec_buffer_phys = data->addr;
 356		ima_kexec_buffer_size = data->size;
 357	}
 358
 359	early_memunmap(data, sizeof(*data));
 360#else
 361	pr_warn("Passed IMA kexec data, but CONFIG_IMA not set. Ignoring.\n");
 362#endif
 363}
 364
 365#if defined(CONFIG_HAVE_IMA_KEXEC) && !defined(CONFIG_OF_FLATTREE)
 366int __init ima_free_kexec_buffer(void)
 367{
 368	int rc;
 369
 370	if (!ima_kexec_buffer_size)
 371		return -ENOENT;
 372
 373	rc = memblock_phys_free(ima_kexec_buffer_phys,
 374				ima_kexec_buffer_size);
 375	if (rc)
 376		return rc;
 377
 378	ima_kexec_buffer_phys = 0;
 379	ima_kexec_buffer_size = 0;
 380
 381	return 0;
 382}
 383
 384int __init ima_get_kexec_buffer(void **addr, size_t *size)
 385{
 386	if (!ima_kexec_buffer_size)
 387		return -ENOENT;
 388
 389	*addr = __va(ima_kexec_buffer_phys);
 390	*size = ima_kexec_buffer_size;
 391
 392	return 0;
 393}
 394#endif
 395
 396static void __init parse_setup_data(void)
 397{
 398	struct setup_data *data;
 399	u64 pa_data, pa_next;
 400
 401	pa_data = boot_params.hdr.setup_data;
 402	while (pa_data) {
 403		u32 data_len, data_type;
 404
 405		data = early_memremap(pa_data, sizeof(*data));
 406		data_len = data->len + sizeof(struct setup_data);
 407		data_type = data->type;
 408		pa_next = data->next;
 409		early_memunmap(data, sizeof(*data));
 410
 411		switch (data_type) {
 412		case SETUP_E820_EXT:
 413			e820__memory_setup_extended(pa_data, data_len);
 414			break;
 415		case SETUP_DTB:
 416			add_dtb(pa_data);
 417			break;
 418		case SETUP_EFI:
 419			parse_efi_setup(pa_data, data_len);
 420			break;
 421		case SETUP_IMA:
 422			add_early_ima_buffer(pa_data);
 423			break;
 424		case SETUP_RNG_SEED:
 425			data = early_memremap(pa_data, data_len);
 426			add_bootloader_randomness(data->data, data->len);
 427			/* Zero seed for forward secrecy. */
 428			memzero_explicit(data->data, data->len);
 429			/* Zero length in case we find ourselves back here by accident. */
 430			memzero_explicit(&data->len, sizeof(data->len));
 431			early_memunmap(data, data_len);
 432			break;
 433		default:
 434			break;
 435		}
 436		pa_data = pa_next;
 437	}
 438}
 439
 440static void __init memblock_x86_reserve_range_setup_data(void)
 441{
 442	struct setup_indirect *indirect;
 443	struct setup_data *data;
 444	u64 pa_data, pa_next;
 445	u32 len;
 446
 447	pa_data = boot_params.hdr.setup_data;
 
 
 
 448	while (pa_data) {
 449		data = early_memremap(pa_data, sizeof(*data));
 450		if (!data) {
 451			pr_warn("setup: failed to memremap setup_data entry\n");
 452			return;
 453		}
 454
 455		len = sizeof(*data);
 456		pa_next = data->next;
 457
 458		memblock_reserve(pa_data, sizeof(*data) + data->len);
 459
 460		if (data->type == SETUP_INDIRECT) {
 461			len += data->len;
 462			early_memunmap(data, sizeof(*data));
 463			data = early_memremap(pa_data, len);
 464			if (!data) {
 465				pr_warn("setup: failed to memremap indirect setup_data\n");
 466				return;
 467			}
 468
 469			indirect = (struct setup_indirect *)data->data;
 
 
 
 
 470
 471			if (indirect->type != SETUP_INDIRECT)
 472				memblock_reserve(indirect->addr, indirect->len);
 473		}
 
 474
 475		pa_data = pa_next;
 476		early_memunmap(data, len);
 
 
 
 
 477	}
 478}
 479
 480/*
 481 * --------- Crashkernel reservation ------------------------------
 482 */
 483
 
 
 484/* 16M alignment for crash kernel regions */
 485#define CRASH_ALIGN		SZ_16M
 486
 487/*
 488 * Keep the crash kernel below this limit.
 489 *
 490 * Earlier 32-bits kernels would limit the kernel to the low 512 MB range
 491 * due to mapping restrictions.
 492 *
 493 * 64-bit kdump kernels need to be restricted to be under 64 TB, which is
 494 * the upper limit of system RAM in 4-level paging mode. Since the kdump
 495 * jump could be from 5-level paging to 4-level paging, the jump will fail if
 496 * the kernel is put above 64 TB, and during the 1st kernel bootup there's
 497 * no good way to detect the paging mode of the target kernel which will be
 498 * loaded for dumping.
 499 */
 500#ifdef CONFIG_X86_32
 501# define CRASH_ADDR_LOW_MAX	SZ_512M
 502# define CRASH_ADDR_HIGH_MAX	SZ_512M
 503#else
 504# define CRASH_ADDR_LOW_MAX	SZ_4G
 505# define CRASH_ADDR_HIGH_MAX	SZ_64T
 506#endif
 507
 508static int __init reserve_crashkernel_low(void)
 509{
 510#ifdef CONFIG_X86_64
 511	unsigned long long base, low_base = 0, low_size = 0;
 512	unsigned long low_mem_limit;
 513	int ret;
 514
 515	low_mem_limit = min(memblock_phys_mem_size(), CRASH_ADDR_LOW_MAX);
 516
 517	/* crashkernel=Y,low */
 518	ret = parse_crashkernel_low(boot_command_line, low_mem_limit, &low_size, &base);
 519	if (ret) {
 520		/*
 521		 * two parts from kernel/dma/swiotlb.c:
 522		 * -swiotlb size: user-specified with swiotlb= or default.
 523		 *
 524		 * -swiotlb overflow buffer: now hardcoded to 32k. We round it
 525		 * to 8M for other buffers that may need to stay low too. Also
 526		 * make sure we allocate enough extra low memory so that we
 527		 * don't run out of DMA buffers for 32-bit devices.
 528		 */
 529		low_size = max(swiotlb_size_or_default() + (8UL << 20), 256UL << 20);
 530	} else {
 531		/* passed with crashkernel=0,low ? */
 532		if (!low_size)
 533			return 0;
 534	}
 535
 536	low_base = memblock_phys_alloc_range(low_size, CRASH_ALIGN, 0, CRASH_ADDR_LOW_MAX);
 537	if (!low_base) {
 538		pr_err("Cannot reserve %ldMB crashkernel low memory, please try smaller size.\n",
 539		       (unsigned long)(low_size >> 20));
 540		return -ENOMEM;
 541	}
 542
 543	pr_info("Reserving %ldMB of low memory at %ldMB for crashkernel (low RAM limit: %ldMB)\n",
 
 
 
 
 
 
 544		(unsigned long)(low_size >> 20),
 545		(unsigned long)(low_base >> 20),
 546		(unsigned long)(low_mem_limit >> 20));
 547
 548	crashk_low_res.start = low_base;
 549	crashk_low_res.end   = low_base + low_size - 1;
 550	insert_resource(&iomem_resource, &crashk_low_res);
 551#endif
 552	return 0;
 553}
 554
 555static void __init reserve_crashkernel(void)
 556{
 557	unsigned long long crash_size, crash_base, total_mem;
 558	bool high = false;
 559	int ret;
 560
 561	if (!IS_ENABLED(CONFIG_KEXEC_CORE))
 562		return;
 563
 564	total_mem = memblock_phys_mem_size();
 565
 566	/* crashkernel=XM */
 567	ret = parse_crashkernel(boot_command_line, total_mem, &crash_size, &crash_base);
 568	if (ret != 0 || crash_size <= 0) {
 569		/* crashkernel=X,high */
 570		ret = parse_crashkernel_high(boot_command_line, total_mem,
 571					     &crash_size, &crash_base);
 572		if (ret != 0 || crash_size <= 0)
 573			return;
 574		high = true;
 575	}
 576
 577	if (xen_pv_domain()) {
 578		pr_info("Ignoring crashkernel for a Xen PV domain\n");
 579		return;
 580	}
 581
 582	/* 0 means: find the address automatically */
 583	if (!crash_base) {
 584		/*
 585		 * Set CRASH_ADDR_LOW_MAX upper bound for crash memory,
 586		 * crashkernel=x,high reserves memory over 4G, also allocates
 587		 * 256M extra low memory for DMA buffers and swiotlb.
 588		 * But the extra memory is not required for all machines.
 589		 * So try low memory first and fall back to high memory
 590		 * unless "crashkernel=size[KMG],high" is specified.
 591		 */
 592		if (!high)
 593			crash_base = memblock_phys_alloc_range(crash_size,
 594						CRASH_ALIGN, CRASH_ALIGN,
 595						CRASH_ADDR_LOW_MAX);
 596		if (!crash_base)
 597			crash_base = memblock_phys_alloc_range(crash_size,
 598						CRASH_ALIGN, CRASH_ALIGN,
 599						CRASH_ADDR_HIGH_MAX);
 600		if (!crash_base) {
 601			pr_info("crashkernel reservation failed - No suitable area found.\n");
 602			return;
 603		}
 
 604	} else {
 605		unsigned long long start;
 606
 607		start = memblock_phys_alloc_range(crash_size, SZ_1M, crash_base,
 608						  crash_base + crash_size);
 
 609		if (start != crash_base) {
 610			pr_info("crashkernel reservation failed - memory is in use.\n");
 611			return;
 612		}
 613	}
 
 
 
 
 
 614
 615	if (crash_base >= (1ULL << 32) && reserve_crashkernel_low()) {
 616		memblock_phys_free(crash_base, crash_size);
 617		return;
 618	}
 619
 620	pr_info("Reserving %ldMB of memory at %ldMB for crashkernel (System RAM: %ldMB)\n",
 621		(unsigned long)(crash_size >> 20),
 622		(unsigned long)(crash_base >> 20),
 623		(unsigned long)(total_mem >> 20));
 624
 625	crashk_res.start = crash_base;
 626	crashk_res.end   = crash_base + crash_size - 1;
 627	insert_resource(&iomem_resource, &crashk_res);
 628}
 
 
 
 
 
 629
 630static struct resource standard_io_resources[] = {
 631	{ .name = "dma1", .start = 0x00, .end = 0x1f,
 632		.flags = IORESOURCE_BUSY | IORESOURCE_IO },
 633	{ .name = "pic1", .start = 0x20, .end = 0x21,
 634		.flags = IORESOURCE_BUSY | IORESOURCE_IO },
 635	{ .name = "timer0", .start = 0x40, .end = 0x43,
 636		.flags = IORESOURCE_BUSY | IORESOURCE_IO },
 637	{ .name = "timer1", .start = 0x50, .end = 0x53,
 638		.flags = IORESOURCE_BUSY | IORESOURCE_IO },
 639	{ .name = "keyboard", .start = 0x60, .end = 0x60,
 640		.flags = IORESOURCE_BUSY | IORESOURCE_IO },
 641	{ .name = "keyboard", .start = 0x64, .end = 0x64,
 642		.flags = IORESOURCE_BUSY | IORESOURCE_IO },
 643	{ .name = "dma page reg", .start = 0x80, .end = 0x8f,
 644		.flags = IORESOURCE_BUSY | IORESOURCE_IO },
 645	{ .name = "pic2", .start = 0xa0, .end = 0xa1,
 646		.flags = IORESOURCE_BUSY | IORESOURCE_IO },
 647	{ .name = "dma2", .start = 0xc0, .end = 0xdf,
 648		.flags = IORESOURCE_BUSY | IORESOURCE_IO },
 649	{ .name = "fpu", .start = 0xf0, .end = 0xff,
 650		.flags = IORESOURCE_BUSY | IORESOURCE_IO }
 651};
 652
 653void __init reserve_standard_io_resources(void)
 654{
 655	int i;
 656
 657	/* request I/O space for devices used on all i[345]86 PCs */
 658	for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
 659		request_resource(&ioport_resource, &standard_io_resources[i]);
 660
 661}
 662
 
 
 
 
 
 
 
 
 
 
 663static bool __init snb_gfx_workaround_needed(void)
 664{
 665#ifdef CONFIG_PCI
 666	int i;
 667	u16 vendor, devid;
 668	static const __initconst u16 snb_ids[] = {
 669		0x0102,
 670		0x0112,
 671		0x0122,
 672		0x0106,
 673		0x0116,
 674		0x0126,
 675		0x010a,
 676	};
 677
 678	/* Assume no if something weird is going on with PCI */
 679	if (!early_pci_allowed())
 680		return false;
 681
 682	vendor = read_pci_config_16(0, 2, 0, PCI_VENDOR_ID);
 683	if (vendor != 0x8086)
 684		return false;
 685
 686	devid = read_pci_config_16(0, 2, 0, PCI_DEVICE_ID);
 687	for (i = 0; i < ARRAY_SIZE(snb_ids); i++)
 688		if (devid == snb_ids[i])
 689			return true;
 690#endif
 691
 692	return false;
 693}
 694
 695/*
 696 * Sandy Bridge graphics has trouble with certain ranges, exclude
 697 * them from allocation.
 698 */
 699static void __init trim_snb_memory(void)
 700{
 701	static const __initconst unsigned long bad_pages[] = {
 702		0x20050000,
 703		0x20110000,
 704		0x20130000,
 705		0x20138000,
 706		0x40004000,
 707	};
 708	int i;
 709
 710	if (!snb_gfx_workaround_needed())
 711		return;
 712
 713	printk(KERN_DEBUG "reserving inaccessible SNB gfx pages\n");
 714
 715	/*
 716	 * SandyBridge integrated graphics devices have a bug that prevents
 717	 * them from accessing certain memory ranges, namely anything below
 718	 * 1M and in the pages listed in bad_pages[] above.
 719	 *
 720	 * To avoid these pages being ever accessed by SNB gfx devices reserve
 721	 * bad_pages that have not already been reserved at boot time.
 722	 * All memory below the 1 MB mark is anyway reserved later during
 723	 * setup_arch(), so there is no need to reserve it here.
 724	 */
 725
 
 726	for (i = 0; i < ARRAY_SIZE(bad_pages); i++) {
 727		if (memblock_reserve(bad_pages[i], PAGE_SIZE))
 728			printk(KERN_WARNING "failed to reserve 0x%08lx\n",
 729			       bad_pages[i]);
 730	}
 731}
 732
 
 
 
 
 
 
 
 
 
 
 
 
 733static void __init trim_bios_range(void)
 734{
 735	/*
 736	 * A special case is the first 4Kb of memory;
 737	 * This is a BIOS owned area, not kernel ram, but generally
 738	 * not listed as such in the E820 table.
 739	 *
 740	 * This typically reserves additional memory (64KiB by default)
 741	 * since some BIOSes are known to corrupt low memory.  See the
 742	 * Kconfig help text for X86_RESERVE_LOW.
 743	 */
 744	e820__range_update(0, PAGE_SIZE, E820_TYPE_RAM, E820_TYPE_RESERVED);
 745
 746	/*
 747	 * special case: Some BIOSes report the PC BIOS
 748	 * area (640Kb -> 1Mb) as RAM even though it is not.
 749	 * take them out.
 750	 */
 751	e820__range_remove(BIOS_BEGIN, BIOS_END - BIOS_BEGIN, E820_TYPE_RAM, 1);
 752
 753	e820__update_table(e820_table);
 754}
 755
 756/* called before trim_bios_range() to spare extra sanitize */
 757static void __init e820_add_kernel_range(void)
 758{
 759	u64 start = __pa_symbol(_text);
 760	u64 size = __pa_symbol(_end) - start;
 761
 762	/*
 763	 * Complain if .text .data and .bss are not marked as E820_TYPE_RAM and
 764	 * attempt to fix it by adding the range. We may have a confused BIOS,
 765	 * or the user may have used memmap=exactmap or memmap=xxM$yyM to
 766	 * exclude kernel range. If we really are running on top non-RAM,
 767	 * we will crash later anyways.
 768	 */
 769	if (e820__mapped_all(start, start + size, E820_TYPE_RAM))
 770		return;
 771
 772	pr_warn(".text .data .bss are not marked as E820_TYPE_RAM!\n");
 773	e820__range_remove(start, size, E820_TYPE_RAM, 0);
 774	e820__range_add(start, size, E820_TYPE_RAM);
 775}
 776
 777static void __init early_reserve_memory(void)
 
 
 778{
 779	/*
 780	 * Reserve the memory occupied by the kernel between _text and
 781	 * __end_of_kernel_reserve symbols. Any kernel sections after the
 782	 * __end_of_kernel_reserve symbol must be explicitly reserved with a
 783	 * separate memblock_reserve() or they will be discarded.
 784	 */
 785	memblock_reserve(__pa_symbol(_text),
 786			 (unsigned long)__end_of_kernel_reserve - (unsigned long)_text);
 787
 788	/*
 789	 * The first 4Kb of memory is a BIOS owned area, but generally it is
 790	 * not listed as such in the E820 table.
 791	 *
 792	 * Reserve the first 64K of memory since some BIOSes are known to
 793	 * corrupt low memory. After the real mode trampoline is allocated the
 794	 * rest of the memory below 640k is reserved.
 795	 *
 796	 * In addition, make sure page 0 is always reserved because on
 797	 * systems with L1TF its contents can be leaked to user processes.
 798	 */
 799	memblock_reserve(0, SZ_64K);
 800
 801	early_reserve_initrd();
 802
 803	memblock_x86_reserve_range_setup_data();
 
 804
 805	reserve_ibft_region();
 806	reserve_bios_regions();
 807	trim_snb_memory();
 
 
 
 808}
 809
 
 
 
 
 
 
 
 810/*
 811 * Dump out kernel offset information on panic.
 812 */
 813static int
 814dump_kernel_offset(struct notifier_block *self, unsigned long v, void *p)
 815{
 816	if (kaslr_enabled()) {
 817		pr_emerg("Kernel Offset: 0x%lx from 0x%lx (relocation range: 0x%lx-0x%lx)\n",
 818			 kaslr_offset(),
 819			 __START_KERNEL,
 820			 __START_KERNEL_map,
 821			 MODULES_VADDR-1);
 822	} else {
 823		pr_emerg("Kernel Offset: disabled\n");
 824	}
 825
 826	return 0;
 827}
 828
 829void x86_configure_nx(void)
 830{
 831	if (boot_cpu_has(X86_FEATURE_NX))
 832		__supported_pte_mask |= _PAGE_NX;
 833	else
 834		__supported_pte_mask &= ~_PAGE_NX;
 835}
 836
 837static void __init x86_report_nx(void)
 838{
 839	if (!boot_cpu_has(X86_FEATURE_NX)) {
 840		printk(KERN_NOTICE "Notice: NX (Execute Disable) protection "
 841		       "missing in CPU!\n");
 842	} else {
 843#if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)
 844		printk(KERN_INFO "NX (Execute Disable) protection: active\n");
 845#else
 846		/* 32bit non-PAE kernel, NX cannot be used */
 847		printk(KERN_NOTICE "Notice: NX (Execute Disable) protection "
 848		       "cannot be enabled: non-PAE kernel!\n");
 849#endif
 850	}
 851}
 852
 853/*
 854 * Determine if we were loaded by an EFI loader.  If so, then we have also been
 855 * passed the efi memmap, systab, etc., so we should use these data structures
 856 * for initialization.  Note, the efi init code path is determined by the
 857 * global efi_enabled. This allows the same kernel image to be used on existing
 858 * systems (with a traditional BIOS) as well as on EFI systems.
 859 */
 860/*
 861 * setup_arch - architecture-specific boot-time initializations
 862 *
 863 * Note: On x86_64, fixmaps are ready for use even before this is called.
 864 */
 865
 866void __init setup_arch(char **cmdline_p)
 867{
 
 
 
 
 
 
 
 
 
 
 
 868#ifdef CONFIG_X86_32
 869	memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
 870
 871	/*
 872	 * copy kernel address range established so far and switch
 873	 * to the proper swapper page table
 874	 */
 875	clone_pgd_range(swapper_pg_dir     + KERNEL_PGD_BOUNDARY,
 876			initial_page_table + KERNEL_PGD_BOUNDARY,
 877			KERNEL_PGD_PTRS);
 878
 879	load_cr3(swapper_pg_dir);
 880	/*
 881	 * Note: Quark X1000 CPUs advertise PGE incorrectly and require
 882	 * a cr3 based tlb flush, so the following __flush_tlb_all()
 883	 * will not flush anything because the CPU quirk which clears
 884	 * X86_FEATURE_PGE has not been invoked yet. Though due to the
 885	 * load_cr3() above the TLB has been flushed already. The
 886	 * quirk is invoked before subsequent calls to __flush_tlb_all()
 887	 * so proper operation is guaranteed.
 888	 */
 889	__flush_tlb_all();
 890#else
 891	printk(KERN_INFO "Command line: %s\n", boot_command_line);
 892	boot_cpu_data.x86_phys_bits = MAX_PHYSMEM_BITS;
 893#endif
 894
 895	/*
 896	 * If we have OLPC OFW, we might end up relocating the fixmap due to
 897	 * reserve_top(), so do this before touching the ioremap area.
 898	 */
 899	olpc_ofw_detect();
 900
 901	idt_setup_early_traps();
 902	early_cpu_init();
 903	jump_label_init();
 904	static_call_init();
 905	early_ioremap_init();
 906
 907	setup_olpc_ofw_pgd();
 908
 909	ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
 910	screen_info = boot_params.screen_info;
 911	edid_info = boot_params.edid_info;
 912#ifdef CONFIG_X86_32
 913	apm_info.bios = boot_params.apm_bios_info;
 914	ist_info = boot_params.ist_info;
 915#endif
 916	saved_video_mode = boot_params.hdr.vid_mode;
 917	bootloader_type = boot_params.hdr.type_of_loader;
 918	if ((bootloader_type >> 4) == 0xe) {
 919		bootloader_type &= 0xf;
 920		bootloader_type |= (boot_params.hdr.ext_loader_type+0x10) << 4;
 921	}
 922	bootloader_version  = bootloader_type & 0xf;
 923	bootloader_version |= boot_params.hdr.ext_loader_ver << 4;
 924
 925#ifdef CONFIG_BLK_DEV_RAM
 926	rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
 
 
 927#endif
 928#ifdef CONFIG_EFI
 929	if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
 930		     EFI32_LOADER_SIGNATURE, 4)) {
 931		set_bit(EFI_BOOT, &efi.flags);
 932	} else if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
 933		     EFI64_LOADER_SIGNATURE, 4)) {
 934		set_bit(EFI_BOOT, &efi.flags);
 935		set_bit(EFI_64BIT, &efi.flags);
 936	}
 
 
 
 937#endif
 938
 939	x86_init.oem.arch_setup();
 940
 941	/*
 942	 * Do some memory reservations *before* memory is added to memblock, so
 943	 * memblock allocations won't overwrite it.
 944	 *
 945	 * After this point, everything still needed from the boot loader or
 946	 * firmware or kernel text should be early reserved or marked not RAM in
 947	 * e820. All other memory is free game.
 948	 *
 949	 * This call needs to happen before e820__memory_setup() which calls the
 950	 * xen_memory_setup() on Xen dom0 which relies on the fact that those
 951	 * early reservations have happened already.
 952	 */
 953	early_reserve_memory();
 954
 955	iomem_resource.end = (1ULL << boot_cpu_data.x86_phys_bits) - 1;
 956	e820__memory_setup();
 957	parse_setup_data();
 958
 959	copy_edd();
 960
 961	if (!boot_params.hdr.root_flags)
 962		root_mountflags &= ~MS_RDONLY;
 963	setup_initial_init_mm(_text, _etext, _edata, (void *)_brk_end);
 
 
 
 
 
 964
 965	code_resource.start = __pa_symbol(_text);
 966	code_resource.end = __pa_symbol(_etext)-1;
 967	rodata_resource.start = __pa_symbol(__start_rodata);
 968	rodata_resource.end = __pa_symbol(__end_rodata)-1;
 969	data_resource.start = __pa_symbol(_sdata);
 970	data_resource.end = __pa_symbol(_edata)-1;
 971	bss_resource.start = __pa_symbol(__bss_start);
 972	bss_resource.end = __pa_symbol(__bss_stop)-1;
 973
 974#ifdef CONFIG_CMDLINE_BOOL
 975#ifdef CONFIG_CMDLINE_OVERRIDE
 976	strscpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
 977#else
 978	if (builtin_cmdline[0]) {
 979		/* append boot loader cmdline to builtin */
 980		strlcat(builtin_cmdline, " ", COMMAND_LINE_SIZE);
 981		strlcat(builtin_cmdline, boot_command_line, COMMAND_LINE_SIZE);
 982		strscpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
 983	}
 984#endif
 985#endif
 986
 987	strscpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
 988	*cmdline_p = command_line;
 989
 990	/*
 991	 * x86_configure_nx() is called before parse_early_param() to detect
 992	 * whether hardware doesn't support NX (so that the early EHCI debug
 993	 * console setup can safely call set_fixmap()).
 
 
 994	 */
 995	x86_configure_nx();
 996
 997	parse_early_param();
 998
 999	if (efi_enabled(EFI_BOOT))
1000		efi_memblock_x86_reserve_range();
1001
1002#ifdef CONFIG_MEMORY_HOTPLUG
1003	/*
1004	 * Memory used by the kernel cannot be hot-removed because Linux
1005	 * cannot migrate the kernel pages. When memory hotplug is
1006	 * enabled, we should prevent memblock from allocating memory
1007	 * for the kernel.
1008	 *
1009	 * ACPI SRAT records all hotpluggable memory ranges. But before
1010	 * SRAT is parsed, we don't know about it.
1011	 *
1012	 * The kernel image is loaded into memory at very early time. We
1013	 * cannot prevent this anyway. So on NUMA system, we set any
1014	 * node the kernel resides in as un-hotpluggable.
1015	 *
1016	 * Since on modern servers, one node could have double-digit
1017	 * gigabytes memory, we can assume the memory around the kernel
1018	 * image is also un-hotpluggable. So before SRAT is parsed, just
1019	 * allocate memory near the kernel image to try the best to keep
1020	 * the kernel away from hotpluggable memory.
1021	 */
1022	if (movable_node_is_enabled())
1023		memblock_set_bottom_up(true);
1024#endif
1025
1026	x86_report_nx();
1027
 
 
 
1028	if (acpi_mps_check()) {
1029#ifdef CONFIG_X86_LOCAL_APIC
1030		disable_apic = 1;
1031#endif
1032		setup_clear_cpu_cap(X86_FEATURE_APIC);
1033	}
1034
1035	e820__reserve_setup_data();
1036	e820__finish_early_params();
 
 
 
 
 
 
1037
1038	if (efi_enabled(EFI_BOOT))
1039		efi_init();
1040
1041	dmi_setup();
 
 
1042
1043	/*
1044	 * VMware detection requires dmi to be available, so this
1045	 * needs to be done after dmi_setup(), for the boot CPU.
1046	 */
1047	init_hypervisor_platform();
1048
1049	tsc_early_init();
1050	x86_init.resources.probe_roms();
1051
1052	/* after parse_early_param, so could debug it */
1053	insert_resource(&iomem_resource, &code_resource);
1054	insert_resource(&iomem_resource, &rodata_resource);
1055	insert_resource(&iomem_resource, &data_resource);
1056	insert_resource(&iomem_resource, &bss_resource);
1057
1058	e820_add_kernel_range();
1059	trim_bios_range();
1060#ifdef CONFIG_X86_32
1061	if (ppro_with_ram_bug()) {
1062		e820__range_update(0x70000000ULL, 0x40000ULL, E820_TYPE_RAM,
1063				  E820_TYPE_RESERVED);
1064		e820__update_table(e820_table);
1065		printk(KERN_INFO "fixed physical RAM map:\n");
1066		e820__print_table("bad_ppro");
1067	}
1068#else
1069	early_gart_iommu_check();
1070#endif
1071
1072	/*
1073	 * partially used pages are not usable - thus
1074	 * we are rounding upwards:
1075	 */
1076	max_pfn = e820__end_of_ram_pfn();
1077
1078	/* update e820 for memory not covered by WB MTRRs */
1079	cache_bp_init();
1080	if (mtrr_trim_uncached_memory(max_pfn))
1081		max_pfn = e820__end_of_ram_pfn();
1082
1083	max_possible_pfn = max_pfn;
1084
1085	/*
1086	 * Define random base addresses for memory sections after max_pfn is
1087	 * defined and before each memory section base is used.
1088	 */
1089	kernel_randomize_memory();
1090
1091#ifdef CONFIG_X86_32
1092	/* max_low_pfn get updated here */
1093	find_low_pfn_range();
1094#else
1095	check_x2apic();
1096
1097	/* How many end-of-memory variables you have, grandma! */
1098	/* need this before calling reserve_initrd */
1099	if (max_pfn > (1UL<<(32 - PAGE_SHIFT)))
1100		max_low_pfn = e820__end_of_low_ram_pfn();
1101	else
1102		max_low_pfn = max_pfn;
1103
1104	high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
1105#endif
1106
1107	/*
1108	 * Find and reserve possible boot-time SMP configuration:
1109	 */
1110	find_smp_config();
1111
 
 
1112	early_alloc_pgt_buf();
1113
1114	/*
1115	 * Need to conclude brk, before e820__memblock_setup()
1116	 * it could use memblock_find_in_range, could overlap with
1117	 * brk area.
1118	 */
1119	reserve_brk();
1120
1121	cleanup_highmap();
1122
1123	memblock_set_current_limit(ISA_END_ADDRESS);
1124	e820__memblock_setup();
1125
1126	/*
1127	 * Needs to run after memblock setup because it needs the physical
1128	 * memory size.
1129	 */
1130	sev_setup_arch();
1131
1132	efi_fake_memmap();
1133	efi_find_mirror();
1134	efi_esrt_init();
1135	efi_mokvar_table_init();
1136
1137	/*
1138	 * The EFI specification says that boot service code won't be
1139	 * called after ExitBootServices(). This is, in fact, a lie.
1140	 */
1141	efi_reserve_boot_services();
 
1142
1143	/* preallocate 4k for mptable mpc */
1144	e820__memblock_alloc_reserved_mpc_new();
1145
1146#ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
1147	setup_bios_corruption_check();
1148#endif
1149
1150#ifdef CONFIG_X86_32
1151	printk(KERN_DEBUG "initial memory mapped: [mem 0x00000000-%#010lx]\n",
1152			(max_pfn_mapped<<PAGE_SHIFT) - 1);
1153#endif
1154
1155	/*
1156	 * Find free memory for the real mode trampoline and place it there. If
1157	 * there is not enough free memory under 1M, on EFI-enabled systems
1158	 * there will be additional attempt to reclaim the memory for the real
1159	 * mode trampoline at efi_free_boot_services().
1160	 *
1161	 * Unconditionally reserve the entire first 1M of RAM because BIOSes
1162	 * are known to corrupt low memory and several hundred kilobytes are not
1163	 * worth complex detection what memory gets clobbered. Windows does the
1164	 * same thing for very similar reasons.
1165	 *
1166	 * Moreover, on machines with SandyBridge graphics or in setups that use
1167	 * crashkernel the entire 1M is reserved anyway.
1168	 */
1169	x86_platform.realmode_reserve();
1170
1171	init_mem_mapping();
1172
1173	idt_setup_early_pf();
1174
1175	/*
1176	 * Update mmu_cr4_features (and, indirectly, trampoline_cr4_features)
1177	 * with the current CR4 value.  This may not be necessary, but
1178	 * auditing all the early-boot CR4 manipulation would be needed to
1179	 * rule it out.
1180	 *
1181	 * Mask off features that don't work outside long mode (just
1182	 * PCIDE for now).
1183	 */
1184	mmu_cr4_features = __read_cr4() & ~X86_CR4_PCIDE;
1185
1186	memblock_set_current_limit(get_max_mapped());
1187
1188	/*
1189	 * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
1190	 */
1191
1192#ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
1193	if (init_ohci1394_dma_early)
1194		init_ohci1394_dma_on_all_controllers();
1195#endif
1196	/* Allocate bigger log buffer */
1197	setup_log_buf(1);
1198
1199	if (efi_enabled(EFI_BOOT)) {
1200		switch (boot_params.secure_boot) {
1201		case efi_secureboot_mode_disabled:
1202			pr_info("Secure boot disabled\n");
1203			break;
1204		case efi_secureboot_mode_enabled:
1205			pr_info("Secure boot enabled\n");
1206			break;
1207		default:
1208			pr_info("Secure boot could not be determined\n");
1209			break;
1210		}
1211	}
1212
1213	reserve_initrd();
1214
1215	acpi_table_upgrade();
1216	/* Look for ACPI tables and reserve memory occupied by them. */
1217	acpi_boot_table_init();
1218
1219	vsmp_init();
1220
1221	io_delay_init();
1222
1223	early_platform_quirks();
 
 
 
1224
1225	early_acpi_boot_init();
1226
1227	initmem_init();
1228	dma_contiguous_reserve(max_pfn_mapped << PAGE_SHIFT);
1229
1230	if (boot_cpu_has(X86_FEATURE_GBPAGES))
1231		hugetlb_cma_reserve(PUD_SHIFT - PAGE_SHIFT);
1232
1233	/*
1234	 * Reserve memory for crash kernel after SRAT is parsed so that it
1235	 * won't consume hotpluggable memory.
1236	 */
1237	reserve_crashkernel();
1238
1239	memblock_find_dma_reserve();
1240
1241	if (!early_xdbc_setup_hardware())
1242		early_xdbc_register_console();
 
1243
1244	x86_init.paging.pagetable_init();
1245
1246	kasan_init();
1247
 
 
 
 
 
 
 
 
 
 
 
 
 
1248	/*
1249	 * Sync back kernel address range.
1250	 *
1251	 * FIXME: Can the later sync in setup_cpu_entry_areas() replace
1252	 * this call?
1253	 */
1254	sync_initial_page_table();
 
 
 
1255
1256	tboot_probe();
1257
1258	map_vsyscall();
1259
1260	generic_apic_probe();
1261
1262	early_quirks();
1263
1264	/*
1265	 * Read APIC and some other early information from ACPI tables.
1266	 */
1267	acpi_boot_init();
 
1268	x86_dtb_init();
1269
1270	/*
1271	 * get boot-time SMP configuration:
1272	 */
1273	get_smp_config();
1274
1275	/*
1276	 * Systems w/o ACPI and mptables might not have it mapped the local
1277	 * APIC yet, but prefill_possible_map() might need to access it.
1278	 */
1279	init_apic_mappings();
1280
1281	prefill_possible_map();
1282
1283	init_cpu_to_node();
1284	init_gi_nodes();
1285
 
1286	io_apic_init_mappings();
1287
1288	x86_init.hyper.guest_late_init();
1289
1290	e820__reserve_resources();
1291	e820__register_nosave_regions(max_pfn);
1292
1293	x86_init.resources.reserve_resources();
1294
1295	e820__setup_pci_gap();
1296
1297#ifdef CONFIG_VT
1298#if defined(CONFIG_VGA_CONSOLE)
1299	if (!efi_enabled(EFI_BOOT) || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
1300		conswitchp = &vga_con;
 
 
1301#endif
1302#endif
1303	x86_init.oem.banner();
1304
1305	x86_init.timers.wallclock_init();
1306
1307	/*
1308	 * This needs to run before setup_local_APIC() which soft-disables the
1309	 * local APIC temporarily and that masks the thermal LVT interrupt,
1310	 * leading to softlockups on machines which have configured SMI
1311	 * interrupt delivery.
1312	 */
1313	therm_lvt_init();
1314
1315	mcheck_init();
1316
 
 
1317	register_refined_jiffies(CLOCK_TICK_RATE);
1318
1319#ifdef CONFIG_EFI
1320	if (efi_enabled(EFI_BOOT))
1321		efi_apply_memmap_quirks();
1322#endif
1323
1324	unwind_init();
1325}
1326
1327#ifdef CONFIG_X86_32
1328
1329static struct resource video_ram_resource = {
1330	.name	= "Video RAM area",
1331	.start	= 0xa0000,
1332	.end	= 0xbffff,
1333	.flags	= IORESOURCE_BUSY | IORESOURCE_MEM
1334};
1335
1336void __init i386_reserve_resources(void)
1337{
1338	request_resource(&iomem_resource, &video_ram_resource);
1339	reserve_standard_io_resources();
1340}
1341
1342#endif /* CONFIG_X86_32 */
1343
1344static struct notifier_block kernel_offset_notifier = {
1345	.notifier_call = dump_kernel_offset
1346};
1347
1348static int __init register_kernel_offset_dumper(void)
1349{
1350	atomic_notifier_chain_register(&panic_notifier_list,
1351					&kernel_offset_notifier);
1352	return 0;
1353}
1354__initcall(register_kernel_offset_dumper);