1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 1995 Linus Torvalds
5 * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999
7 * Memory region support
8 * David Parsons <orc@pell.chi.il.us>, July-August 1999
10 * Added E820 sanitization routine (removes overlapping memory regions);
11 * Brian Moyle <bmoyle@mvista.com>, February 2001
13 * Moved CPU detection code to cpu/${cpu}.c
14 * Patrick Mochel <mochel@osdl.org>, March 2002
16 * Provisions for empty E820 memory regions (reported by certain BIOSes).
17 * Alex Achenbach <xela@slit.de>, December 2002.
22 * This file handles the architecture-dependent parts of initialization
25 #include <linux/sched.h>
27 #include <linux/mmzone.h>
28 #include <linux/screen_info.h>
29 #include <linux/ioport.h>
30 #include <linux/acpi.h>
31 #include <linux/sfi.h>
32 #include <linux/apm_bios.h>
33 #include <linux/initrd.h>
34 #include <linux/memblock.h>
35 #include <linux/seq_file.h>
36 #include <linux/console.h>
37 #include <linux/root_dev.h>
38 #include <linux/highmem.h>
39 #include <linux/export.h>
40 #include <linux/efi.h>
41 #include <linux/init.h>
42 #include <linux/edd.h>
43 #include <linux/iscsi_ibft.h>
44 #include <linux/nodemask.h>
45 #include <linux/kexec.h>
46 #include <linux/dmi.h>
47 #include <linux/pfn.h>
48 #include <linux/pci.h>
49 #include <asm/pci-direct.h>
50 #include <linux/init_ohci1394_dma.h>
51 #include <linux/kvm_para.h>
52 #include <linux/dma-contiguous.h>
54 #include <uapi/linux/mount.h>
56 #include <linux/errno.h>
57 #include <linux/kernel.h>
58 #include <linux/stddef.h>
59 #include <linux/unistd.h>
60 #include <linux/ptrace.h>
61 #include <linux/user.h>
62 #include <linux/delay.h>
64 #include <linux/kallsyms.h>
65 #include <linux/cpufreq.h>
66 #include <linux/dma-mapping.h>
67 #include <linux/ctype.h>
68 #include <linux/uaccess.h>
70 #include <linux/percpu.h>
71 #include <linux/crash_dump.h>
72 #include <linux/tboot.h>
73 #include <linux/jiffies.h>
74 #include <linux/mem_encrypt.h>
75 #include <linux/sizes.h>
77 #include <linux/usb/xhci-dbgp.h>
78 #include <video/edid.h>
82 #include <asm/realmode.h>
83 #include <asm/e820/api.h>
84 #include <asm/mpspec.h>
85 #include <asm/setup.h>
87 #include <asm/timer.h>
88 #include <asm/i8259.h>
89 #include <asm/sections.h>
90 #include <asm/io_apic.h>
92 #include <asm/setup_arch.h>
93 #include <asm/bios_ebda.h>
94 #include <asm/cacheflush.h>
95 #include <asm/processor.h>
97 #include <asm/kasan.h>
99 #include <asm/vsyscall.h>
101 #include <asm/desc.h>
103 #include <asm/iommu.h>
104 #include <asm/gart.h>
105 #include <asm/mmu_context.h>
106 #include <asm/proto.h>
108 #include <asm/paravirt.h>
109 #include <asm/hypervisor.h>
110 #include <asm/olpc_ofw.h>
112 #include <asm/percpu.h>
113 #include <asm/topology.h>
114 #include <asm/apicdef.h>
115 #include <asm/amd_nb.h>
117 #include <asm/alternative.h>
118 #include <asm/prom.h>
119 #include <asm/microcode.h>
120 #include <asm/kaslr.h>
121 #include <asm/unwind.h>
124 * max_low_pfn_mapped: highest direct mapped pfn under 4GB
125 * max_pfn_mapped: highest direct mapped pfn over 4GB
127 * The direct mapping only covers E820_TYPE_RAM regions, so the ranges and gaps are
128 * represented by pfn_mapped
130 unsigned long max_low_pfn_mapped;
131 unsigned long max_pfn_mapped;
134 RESERVE_BRK(dmi_alloc, 65536);
138 static __initdata unsigned long _brk_start = (unsigned long)__brk_base;
139 unsigned long _brk_end = (unsigned long)__brk_base;
141 struct boot_params boot_params;
146 static struct resource data_resource = {
147 .name = "Kernel data",
150 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM
153 static struct resource code_resource = {
154 .name = "Kernel code",
157 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM
160 static struct resource bss_resource = {
161 .name = "Kernel bss",
164 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM
169 /* cpu data as detected by the assembly code in head_32.S */
170 struct cpuinfo_x86 new_cpu_data;
172 /* common cpu data for all cpus */
173 struct cpuinfo_x86 boot_cpu_data __read_mostly;
174 EXPORT_SYMBOL(boot_cpu_data);
176 unsigned int def_to_bigsmp;
178 /* for MCA, but anyone else can use it if they want */
179 unsigned int machine_id;
180 unsigned int machine_submodel_id;
181 unsigned int BIOS_revision;
183 struct apm_info apm_info;
184 EXPORT_SYMBOL(apm_info);
186 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
187 defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
188 struct ist_info ist_info;
189 EXPORT_SYMBOL(ist_info);
191 struct ist_info ist_info;
195 struct cpuinfo_x86 boot_cpu_data __read_mostly;
196 EXPORT_SYMBOL(boot_cpu_data);
200 #if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64)
201 __visible unsigned long mmu_cr4_features __ro_after_init;
203 __visible unsigned long mmu_cr4_features __ro_after_init = X86_CR4_PAE;
206 /* Boot loader ID and version as integers, for the benefit of proc_dointvec */
207 int bootloader_type, bootloader_version;
212 struct screen_info screen_info;
213 EXPORT_SYMBOL(screen_info);
214 struct edid_info edid_info;
215 EXPORT_SYMBOL_GPL(edid_info);
217 extern int root_mountflags;
219 unsigned long saved_video_mode;
221 #define RAMDISK_IMAGE_START_MASK 0x07FF
222 #define RAMDISK_PROMPT_FLAG 0x8000
223 #define RAMDISK_LOAD_FLAG 0x4000
225 static char __initdata command_line[COMMAND_LINE_SIZE];
226 #ifdef CONFIG_CMDLINE_BOOL
227 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
230 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
232 #ifdef CONFIG_EDD_MODULE
236 * copy_edd() - Copy the BIOS EDD information
237 * from boot_params into a safe place.
240 static inline void __init copy_edd(void)
242 memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer,
243 sizeof(edd.mbr_signature));
244 memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
245 edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
246 edd.edd_info_nr = boot_params.eddbuf_entries;
249 static inline void __init copy_edd(void)
254 void * __init extend_brk(size_t size, size_t align)
256 size_t mask = align - 1;
259 BUG_ON(_brk_start == 0);
260 BUG_ON(align & mask);
262 _brk_end = (_brk_end + mask) & ~mask;
263 BUG_ON((char *)(_brk_end + size) > __brk_limit);
265 ret = (void *)_brk_end;
268 memset(ret, 0, size);
274 static void __init cleanup_highmap(void)
279 static void __init reserve_brk(void)
281 if (_brk_end > _brk_start)
282 memblock_reserve(__pa_symbol(_brk_start),
283 _brk_end - _brk_start);
285 /* Mark brk area as locked down and no longer taking any
290 u64 relocated_ramdisk;
292 #ifdef CONFIG_BLK_DEV_INITRD
294 static u64 __init get_ramdisk_image(void)
296 u64 ramdisk_image = boot_params.hdr.ramdisk_image;
298 ramdisk_image |= (u64)boot_params.ext_ramdisk_image << 32;
300 return ramdisk_image;
302 static u64 __init get_ramdisk_size(void)
304 u64 ramdisk_size = boot_params.hdr.ramdisk_size;
306 ramdisk_size |= (u64)boot_params.ext_ramdisk_size << 32;
311 static void __init relocate_initrd(void)
313 /* Assume only end is not page aligned */
314 u64 ramdisk_image = get_ramdisk_image();
315 u64 ramdisk_size = get_ramdisk_size();
316 u64 area_size = PAGE_ALIGN(ramdisk_size);
318 /* We need to move the initrd down into directly mapped mem */
319 relocated_ramdisk = memblock_find_in_range(0, PFN_PHYS(max_pfn_mapped),
320 area_size, PAGE_SIZE);
322 if (!relocated_ramdisk)
323 panic("Cannot find place for new RAMDISK of size %lld\n",
326 /* Note: this includes all the mem currently occupied by
327 the initrd, we rely on that fact to keep the data intact. */
328 memblock_reserve(relocated_ramdisk, area_size);
329 initrd_start = relocated_ramdisk + PAGE_OFFSET;
330 initrd_end = initrd_start + ramdisk_size;
331 printk(KERN_INFO "Allocated new RAMDISK: [mem %#010llx-%#010llx]\n",
332 relocated_ramdisk, relocated_ramdisk + ramdisk_size - 1);
334 copy_from_early_mem((void *)initrd_start, ramdisk_image, ramdisk_size);
336 printk(KERN_INFO "Move RAMDISK from [mem %#010llx-%#010llx] to"
337 " [mem %#010llx-%#010llx]\n",
338 ramdisk_image, ramdisk_image + ramdisk_size - 1,
339 relocated_ramdisk, relocated_ramdisk + ramdisk_size - 1);
342 static void __init early_reserve_initrd(void)
344 /* Assume only end is not page aligned */
345 u64 ramdisk_image = get_ramdisk_image();
346 u64 ramdisk_size = get_ramdisk_size();
347 u64 ramdisk_end = PAGE_ALIGN(ramdisk_image + ramdisk_size);
349 if (!boot_params.hdr.type_of_loader ||
350 !ramdisk_image || !ramdisk_size)
351 return; /* No initrd provided by bootloader */
353 memblock_reserve(ramdisk_image, ramdisk_end - ramdisk_image);
355 static void __init reserve_initrd(void)
357 /* Assume only end is not page aligned */
358 u64 ramdisk_image = get_ramdisk_image();
359 u64 ramdisk_size = get_ramdisk_size();
360 u64 ramdisk_end = PAGE_ALIGN(ramdisk_image + ramdisk_size);
363 if (!boot_params.hdr.type_of_loader ||
364 !ramdisk_image || !ramdisk_size)
365 return; /* No initrd provided by bootloader */
369 mapped_size = memblock_mem_size(max_pfn_mapped);
370 if (ramdisk_size >= (mapped_size>>1))
371 panic("initrd too large to handle, "
372 "disabling initrd (%lld needed, %lld available)\n",
373 ramdisk_size, mapped_size>>1);
375 printk(KERN_INFO "RAMDISK: [mem %#010llx-%#010llx]\n", ramdisk_image,
378 if (pfn_range_is_mapped(PFN_DOWN(ramdisk_image),
379 PFN_DOWN(ramdisk_end))) {
380 /* All are mapped, easy case */
381 initrd_start = ramdisk_image + PAGE_OFFSET;
382 initrd_end = initrd_start + ramdisk_size;
388 memblock_free(ramdisk_image, ramdisk_end - ramdisk_image);
392 static void __init early_reserve_initrd(void)
395 static void __init reserve_initrd(void)
398 #endif /* CONFIG_BLK_DEV_INITRD */
400 static void __init parse_setup_data(void)
402 struct setup_data *data;
403 u64 pa_data, pa_next;
405 pa_data = boot_params.hdr.setup_data;
407 u32 data_len, data_type;
409 data = early_memremap(pa_data, sizeof(*data));
410 data_len = data->len + sizeof(struct setup_data);
411 data_type = data->type;
412 pa_next = data->next;
413 early_memunmap(data, sizeof(*data));
417 e820__memory_setup_extended(pa_data, data_len);
423 parse_efi_setup(pa_data, data_len);
432 static void __init memblock_x86_reserve_range_setup_data(void)
434 struct setup_data *data;
437 pa_data = boot_params.hdr.setup_data;
439 data = early_memremap(pa_data, sizeof(*data));
440 memblock_reserve(pa_data, sizeof(*data) + data->len);
441 pa_data = data->next;
442 early_memunmap(data, sizeof(*data));
447 * --------- Crashkernel reservation ------------------------------
450 #ifdef CONFIG_KEXEC_CORE
452 /* 16M alignment for crash kernel regions */
453 #define CRASH_ALIGN SZ_16M
456 * Keep the crash kernel below this limit. On 32 bits earlier kernels
457 * would limit the kernel to the low 512 MiB due to mapping restrictions.
460 # define CRASH_ADDR_LOW_MAX SZ_512M
461 # define CRASH_ADDR_HIGH_MAX SZ_512M
463 # define CRASH_ADDR_LOW_MAX SZ_4G
464 # define CRASH_ADDR_HIGH_MAX MAXMEM
467 static int __init reserve_crashkernel_low(void)
470 unsigned long long base, low_base = 0, low_size = 0;
471 unsigned long total_low_mem;
474 total_low_mem = memblock_mem_size(1UL << (32 - PAGE_SHIFT));
476 /* crashkernel=Y,low */
477 ret = parse_crashkernel_low(boot_command_line, total_low_mem, &low_size, &base);
480 * two parts from lib/swiotlb.c:
481 * -swiotlb size: user-specified with swiotlb= or default.
483 * -swiotlb overflow buffer: now hardcoded to 32k. We round it
484 * to 8M for other buffers that may need to stay low too. Also
485 * make sure we allocate enough extra low memory so that we
486 * don't run out of DMA buffers for 32-bit devices.
488 low_size = max(swiotlb_size_or_default() + (8UL << 20), 256UL << 20);
490 /* passed with crashkernel=0,low ? */
495 low_base = memblock_find_in_range(0, 1ULL << 32, low_size, CRASH_ALIGN);
497 pr_err("Cannot reserve %ldMB crashkernel low memory, please try smaller size.\n",
498 (unsigned long)(low_size >> 20));
502 ret = memblock_reserve(low_base, low_size);
504 pr_err("%s: Error reserving crashkernel low memblock.\n", __func__);
508 pr_info("Reserving %ldMB of low memory at %ldMB for crashkernel (System low RAM: %ldMB)\n",
509 (unsigned long)(low_size >> 20),
510 (unsigned long)(low_base >> 20),
511 (unsigned long)(total_low_mem >> 20));
513 crashk_low_res.start = low_base;
514 crashk_low_res.end = low_base + low_size - 1;
515 insert_resource(&iomem_resource, &crashk_low_res);
520 static void __init reserve_crashkernel(void)
522 unsigned long long crash_size, crash_base, total_mem;
526 total_mem = memblock_phys_mem_size();
529 ret = parse_crashkernel(boot_command_line, total_mem, &crash_size, &crash_base);
530 if (ret != 0 || crash_size <= 0) {
531 /* crashkernel=X,high */
532 ret = parse_crashkernel_high(boot_command_line, total_mem,
533 &crash_size, &crash_base);
534 if (ret != 0 || crash_size <= 0)
539 if (xen_pv_domain()) {
540 pr_info("Ignoring crashkernel for a Xen PV domain\n");
544 /* 0 means: find the address automatically */
547 * Set CRASH_ADDR_LOW_MAX upper bound for crash memory,
548 * crashkernel=x,high reserves memory over 4G, also allocates
549 * 256M extra low memory for DMA buffers and swiotlb.
550 * But the extra memory is not required for all machines.
551 * So try low memory first and fall back to high memory
552 * unless "crashkernel=size[KMG],high" is specified.
555 crash_base = memblock_find_in_range(CRASH_ALIGN,
557 crash_size, CRASH_ALIGN);
559 crash_base = memblock_find_in_range(CRASH_ALIGN,
561 crash_size, CRASH_ALIGN);
563 pr_info("crashkernel reservation failed - No suitable area found.\n");
567 unsigned long long start;
569 start = memblock_find_in_range(crash_base,
570 crash_base + crash_size,
571 crash_size, 1 << 20);
572 if (start != crash_base) {
573 pr_info("crashkernel reservation failed - memory is in use.\n");
577 ret = memblock_reserve(crash_base, crash_size);
579 pr_err("%s: Error reserving crashkernel memblock.\n", __func__);
583 if (crash_base >= (1ULL << 32) && reserve_crashkernel_low()) {
584 memblock_free(crash_base, crash_size);
588 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel (System RAM: %ldMB)\n",
589 (unsigned long)(crash_size >> 20),
590 (unsigned long)(crash_base >> 20),
591 (unsigned long)(total_mem >> 20));
593 crashk_res.start = crash_base;
594 crashk_res.end = crash_base + crash_size - 1;
595 insert_resource(&iomem_resource, &crashk_res);
598 static void __init reserve_crashkernel(void)
603 static struct resource standard_io_resources[] = {
604 { .name = "dma1", .start = 0x00, .end = 0x1f,
605 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
606 { .name = "pic1", .start = 0x20, .end = 0x21,
607 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
608 { .name = "timer0", .start = 0x40, .end = 0x43,
609 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
610 { .name = "timer1", .start = 0x50, .end = 0x53,
611 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
612 { .name = "keyboard", .start = 0x60, .end = 0x60,
613 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
614 { .name = "keyboard", .start = 0x64, .end = 0x64,
615 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
616 { .name = "dma page reg", .start = 0x80, .end = 0x8f,
617 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
618 { .name = "pic2", .start = 0xa0, .end = 0xa1,
619 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
620 { .name = "dma2", .start = 0xc0, .end = 0xdf,
621 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
622 { .name = "fpu", .start = 0xf0, .end = 0xff,
623 .flags = IORESOURCE_BUSY | IORESOURCE_IO }
626 void __init reserve_standard_io_resources(void)
630 /* request I/O space for devices used on all i[345]86 PCs */
631 for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
632 request_resource(&ioport_resource, &standard_io_resources[i]);
636 static __init void reserve_ibft_region(void)
638 unsigned long addr, size = 0;
640 addr = find_ibft_region(&size);
643 memblock_reserve(addr, size);
646 static bool __init snb_gfx_workaround_needed(void)
651 static const __initconst u16 snb_ids[] = {
661 /* Assume no if something weird is going on with PCI */
662 if (!early_pci_allowed())
665 vendor = read_pci_config_16(0, 2, 0, PCI_VENDOR_ID);
666 if (vendor != 0x8086)
669 devid = read_pci_config_16(0, 2, 0, PCI_DEVICE_ID);
670 for (i = 0; i < ARRAY_SIZE(snb_ids); i++)
671 if (devid == snb_ids[i])
679 * Sandy Bridge graphics has trouble with certain ranges, exclude
680 * them from allocation.
682 static void __init trim_snb_memory(void)
684 static const __initconst unsigned long bad_pages[] = {
693 if (!snb_gfx_workaround_needed())
696 printk(KERN_DEBUG "reserving inaccessible SNB gfx pages\n");
699 * Reserve all memory below the 1 MB mark that has not
700 * already been reserved.
702 memblock_reserve(0, 1<<20);
704 for (i = 0; i < ARRAY_SIZE(bad_pages); i++) {
705 if (memblock_reserve(bad_pages[i], PAGE_SIZE))
706 printk(KERN_WARNING "failed to reserve 0x%08lx\n",
712 * Here we put platform-specific memory range workarounds, i.e.
713 * memory known to be corrupt or otherwise in need to be reserved on
714 * specific platforms.
716 * If this gets used more widely it could use a real dispatch mechanism.
718 static void __init trim_platform_memory_ranges(void)
723 static void __init trim_bios_range(void)
726 * A special case is the first 4Kb of memory;
727 * This is a BIOS owned area, not kernel ram, but generally
728 * not listed as such in the E820 table.
730 * This typically reserves additional memory (64KiB by default)
731 * since some BIOSes are known to corrupt low memory. See the
732 * Kconfig help text for X86_RESERVE_LOW.
734 e820__range_update(0, PAGE_SIZE, E820_TYPE_RAM, E820_TYPE_RESERVED);
737 * special case: Some BIOSen report the PC BIOS
738 * area (640->1Mb) as ram even though it is not.
741 e820__range_remove(BIOS_BEGIN, BIOS_END - BIOS_BEGIN, E820_TYPE_RAM, 1);
743 e820__update_table(e820_table);
746 /* called before trim_bios_range() to spare extra sanitize */
747 static void __init e820_add_kernel_range(void)
749 u64 start = __pa_symbol(_text);
750 u64 size = __pa_symbol(_end) - start;
753 * Complain if .text .data and .bss are not marked as E820_TYPE_RAM and
754 * attempt to fix it by adding the range. We may have a confused BIOS,
755 * or the user may have used memmap=exactmap or memmap=xxM$yyM to
756 * exclude kernel range. If we really are running on top non-RAM,
757 * we will crash later anyways.
759 if (e820__mapped_all(start, start + size, E820_TYPE_RAM))
762 pr_warn(".text .data .bss are not marked as E820_TYPE_RAM!\n");
763 e820__range_remove(start, size, E820_TYPE_RAM, 0);
764 e820__range_add(start, size, E820_TYPE_RAM);
767 static unsigned reserve_low = CONFIG_X86_RESERVE_LOW << 10;
769 static int __init parse_reservelow(char *p)
771 unsigned long long size;
776 size = memparse(p, &p);
789 early_param("reservelow", parse_reservelow);
791 static void __init trim_low_memory_range(void)
793 memblock_reserve(0, ALIGN(reserve_low, PAGE_SIZE));
797 * Dump out kernel offset information on panic.
800 dump_kernel_offset(struct notifier_block *self, unsigned long v, void *p)
802 if (kaslr_enabled()) {
803 pr_emerg("Kernel Offset: 0x%lx from 0x%lx (relocation range: 0x%lx-0x%lx)\n",
809 pr_emerg("Kernel Offset: disabled\n");
816 * Determine if we were loaded by an EFI loader. If so, then we have also been
817 * passed the efi memmap, systab, etc., so we should use these data structures
818 * for initialization. Note, the efi init code path is determined by the
819 * global efi_enabled. This allows the same kernel image to be used on existing
820 * systems (with a traditional BIOS) as well as on EFI systems.
823 * setup_arch - architecture-specific boot-time initializations
825 * Note: On x86_64, fixmaps are ready for use even before this is called.
828 void __init setup_arch(char **cmdline_p)
830 memblock_reserve(__pa_symbol(_text),
831 (unsigned long)__bss_stop - (unsigned long)_text);
834 * Make sure page 0 is always reserved because on systems with
835 * L1TF its contents can be leaked to user processes.
837 memblock_reserve(0, PAGE_SIZE);
839 early_reserve_initrd();
842 * At this point everything still needed from the boot loader
843 * or BIOS or kernel text should be early reserved or marked not
844 * RAM in e820. All other memory is free game.
848 memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
851 * copy kernel address range established so far and switch
852 * to the proper swapper page table
854 clone_pgd_range(swapper_pg_dir + KERNEL_PGD_BOUNDARY,
855 initial_page_table + KERNEL_PGD_BOUNDARY,
858 load_cr3(swapper_pg_dir);
860 * Note: Quark X1000 CPUs advertise PGE incorrectly and require
861 * a cr3 based tlb flush, so the following __flush_tlb_all()
862 * will not flush anything because the cpu quirk which clears
863 * X86_FEATURE_PGE has not been invoked yet. Though due to the
864 * load_cr3() above the TLB has been flushed already. The
865 * quirk is invoked before subsequent calls to __flush_tlb_all()
866 * so proper operation is guaranteed.
870 printk(KERN_INFO "Command line: %s\n", boot_command_line);
871 boot_cpu_data.x86_phys_bits = MAX_PHYSMEM_BITS;
875 * If we have OLPC OFW, we might end up relocating the fixmap due to
876 * reserve_top(), so do this before touching the ioremap area.
880 idt_setup_early_traps();
882 arch_init_ideal_nops();
884 early_ioremap_init();
886 setup_olpc_ofw_pgd();
888 ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
889 screen_info = boot_params.screen_info;
890 edid_info = boot_params.edid_info;
892 apm_info.bios = boot_params.apm_bios_info;
893 ist_info = boot_params.ist_info;
895 saved_video_mode = boot_params.hdr.vid_mode;
896 bootloader_type = boot_params.hdr.type_of_loader;
897 if ((bootloader_type >> 4) == 0xe) {
898 bootloader_type &= 0xf;
899 bootloader_type |= (boot_params.hdr.ext_loader_type+0x10) << 4;
901 bootloader_version = bootloader_type & 0xf;
902 bootloader_version |= boot_params.hdr.ext_loader_ver << 4;
904 #ifdef CONFIG_BLK_DEV_RAM
905 rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
906 rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
907 rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
910 if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
911 EFI32_LOADER_SIGNATURE, 4)) {
912 set_bit(EFI_BOOT, &efi.flags);
913 } else if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
914 EFI64_LOADER_SIGNATURE, 4)) {
915 set_bit(EFI_BOOT, &efi.flags);
916 set_bit(EFI_64BIT, &efi.flags);
920 x86_init.oem.arch_setup();
922 iomem_resource.end = (1ULL << boot_cpu_data.x86_phys_bits) - 1;
923 e820__memory_setup();
928 if (!boot_params.hdr.root_flags)
929 root_mountflags &= ~MS_RDONLY;
930 init_mm.start_code = (unsigned long) _text;
931 init_mm.end_code = (unsigned long) _etext;
932 init_mm.end_data = (unsigned long) _edata;
933 init_mm.brk = _brk_end;
935 mpx_mm_init(&init_mm);
937 code_resource.start = __pa_symbol(_text);
938 code_resource.end = __pa_symbol(_etext)-1;
939 data_resource.start = __pa_symbol(_etext);
940 data_resource.end = __pa_symbol(_edata)-1;
941 bss_resource.start = __pa_symbol(__bss_start);
942 bss_resource.end = __pa_symbol(__bss_stop)-1;
944 #ifdef CONFIG_CMDLINE_BOOL
945 #ifdef CONFIG_CMDLINE_OVERRIDE
946 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
948 if (builtin_cmdline[0]) {
949 /* append boot loader cmdline to builtin */
950 strlcat(builtin_cmdline, " ", COMMAND_LINE_SIZE);
951 strlcat(builtin_cmdline, boot_command_line, COMMAND_LINE_SIZE);
952 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
957 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
958 *cmdline_p = command_line;
961 * x86_configure_nx() is called before parse_early_param() to detect
962 * whether hardware doesn't support NX (so that the early EHCI debug
963 * console setup can safely call set_fixmap()). It may then be called
964 * again from within noexec_setup() during parsing early parameters
965 * to honor the respective command line option.
971 if (efi_enabled(EFI_BOOT))
972 efi_memblock_x86_reserve_range();
973 #ifdef CONFIG_MEMORY_HOTPLUG
975 * Memory used by the kernel cannot be hot-removed because Linux
976 * cannot migrate the kernel pages. When memory hotplug is
977 * enabled, we should prevent memblock from allocating memory
980 * ACPI SRAT records all hotpluggable memory ranges. But before
981 * SRAT is parsed, we don't know about it.
983 * The kernel image is loaded into memory at very early time. We
984 * cannot prevent this anyway. So on NUMA system, we set any
985 * node the kernel resides in as un-hotpluggable.
987 * Since on modern servers, one node could have double-digit
988 * gigabytes memory, we can assume the memory around the kernel
989 * image is also un-hotpluggable. So before SRAT is parsed, just
990 * allocate memory near the kernel image to try the best to keep
991 * the kernel away from hotpluggable memory.
993 if (movable_node_is_enabled())
994 memblock_set_bottom_up(true);
999 /* after early param, so could get panic from serial */
1000 memblock_x86_reserve_range_setup_data();
1002 if (acpi_mps_check()) {
1003 #ifdef CONFIG_X86_LOCAL_APIC
1006 setup_clear_cpu_cap(X86_FEATURE_APIC);
1009 e820__reserve_setup_data();
1010 e820__finish_early_params();
1012 if (efi_enabled(EFI_BOOT))
1018 * VMware detection requires dmi to be available, so this
1019 * needs to be done after dmi_setup(), for the boot CPU.
1021 init_hypervisor_platform();
1024 x86_init.resources.probe_roms();
1026 /* after parse_early_param, so could debug it */
1027 insert_resource(&iomem_resource, &code_resource);
1028 insert_resource(&iomem_resource, &data_resource);
1029 insert_resource(&iomem_resource, &bss_resource);
1031 e820_add_kernel_range();
1033 #ifdef CONFIG_X86_32
1034 if (ppro_with_ram_bug()) {
1035 e820__range_update(0x70000000ULL, 0x40000ULL, E820_TYPE_RAM,
1036 E820_TYPE_RESERVED);
1037 e820__update_table(e820_table);
1038 printk(KERN_INFO "fixed physical RAM map:\n");
1039 e820__print_table("bad_ppro");
1042 early_gart_iommu_check();
1046 * partially used pages are not usable - thus
1047 * we are rounding upwards:
1049 max_pfn = e820__end_of_ram_pfn();
1051 /* update e820 for memory not covered by WB MTRRs */
1053 if (mtrr_trim_uncached_memory(max_pfn))
1054 max_pfn = e820__end_of_ram_pfn();
1056 max_possible_pfn = max_pfn;
1059 * This call is required when the CPU does not support PAT. If
1060 * mtrr_bp_init() invoked it already via pat_init() the call has no
1066 * Define random base addresses for memory sections after max_pfn is
1067 * defined and before each memory section base is used.
1069 kernel_randomize_memory();
1071 #ifdef CONFIG_X86_32
1072 /* max_low_pfn get updated here */
1073 find_low_pfn_range();
1077 /* How many end-of-memory variables you have, grandma! */
1078 /* need this before calling reserve_initrd */
1079 if (max_pfn > (1UL<<(32 - PAGE_SHIFT)))
1080 max_low_pfn = e820__end_of_low_ram_pfn();
1082 max_low_pfn = max_pfn;
1084 high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
1088 * Find and reserve possible boot-time SMP configuration:
1092 reserve_ibft_region();
1094 early_alloc_pgt_buf();
1097 * Need to conclude brk, before e820__memblock_setup()
1098 * it could use memblock_find_in_range, could overlap with
1105 memblock_set_current_limit(ISA_END_ADDRESS);
1106 e820__memblock_setup();
1108 reserve_bios_regions();
1110 if (efi_enabled(EFI_MEMMAP)) {
1116 * The EFI specification says that boot service code won't be
1117 * called after ExitBootServices(). This is, in fact, a lie.
1119 efi_reserve_boot_services();
1122 /* preallocate 4k for mptable mpc */
1123 e820__memblock_alloc_reserved_mpc_new();
1125 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
1126 setup_bios_corruption_check();
1129 #ifdef CONFIG_X86_32
1130 printk(KERN_DEBUG "initial memory mapped: [mem 0x00000000-%#010lx]\n",
1131 (max_pfn_mapped<<PAGE_SHIFT) - 1);
1134 reserve_real_mode();
1136 trim_platform_memory_ranges();
1137 trim_low_memory_range();
1141 idt_setup_early_pf();
1144 * Update mmu_cr4_features (and, indirectly, trampoline_cr4_features)
1145 * with the current CR4 value. This may not be necessary, but
1146 * auditing all the early-boot CR4 manipulation would be needed to
1149 * Mask off features that don't work outside long mode (just
1152 mmu_cr4_features = __read_cr4() & ~X86_CR4_PCIDE;
1154 memblock_set_current_limit(get_max_mapped());
1157 * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
1160 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
1161 if (init_ohci1394_dma_early)
1162 init_ohci1394_dma_on_all_controllers();
1164 /* Allocate bigger log buffer */
1167 if (efi_enabled(EFI_BOOT)) {
1168 switch (boot_params.secure_boot) {
1169 case efi_secureboot_mode_disabled:
1170 pr_info("Secure boot disabled\n");
1172 case efi_secureboot_mode_enabled:
1173 pr_info("Secure boot enabled\n");
1176 pr_info("Secure boot could not be determined\n");
1183 acpi_table_upgrade();
1189 early_platform_quirks();
1192 * Parse the ACPI tables for possible boot-time SMP configuration.
1194 acpi_boot_table_init();
1196 early_acpi_boot_init();
1199 dma_contiguous_reserve(max_pfn_mapped << PAGE_SHIFT);
1202 * Reserve memory for crash kernel after SRAT is parsed so that it
1203 * won't consume hotpluggable memory.
1205 reserve_crashkernel();
1207 memblock_find_dma_reserve();
1209 if (!early_xdbc_setup_hardware())
1210 early_xdbc_register_console();
1212 x86_init.paging.pagetable_init();
1217 * Sync back kernel address range.
1219 * FIXME: Can the later sync in setup_cpu_entry_areas() replace
1222 sync_initial_page_table();
1228 generic_apic_probe();
1233 * Read APIC and some other early information from ACPI tables.
1240 * get boot-time SMP configuration:
1245 * Systems w/o ACPI and mptables might not have it mapped the local
1246 * APIC yet, but prefill_possible_map() might need to access it.
1248 init_apic_mappings();
1250 prefill_possible_map();
1254 io_apic_init_mappings();
1256 x86_init.hyper.guest_late_init();
1258 e820__reserve_resources();
1259 e820__register_nosave_regions(max_pfn);
1261 x86_init.resources.reserve_resources();
1263 e820__setup_pci_gap();
1266 #if defined(CONFIG_VGA_CONSOLE)
1267 if (!efi_enabled(EFI_BOOT) || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
1268 conswitchp = &vga_con;
1269 #elif defined(CONFIG_DUMMY_CONSOLE)
1270 conswitchp = &dummy_con;
1273 x86_init.oem.banner();
1275 x86_init.timers.wallclock_init();
1279 register_refined_jiffies(CLOCK_TICK_RATE);
1282 if (efi_enabled(EFI_BOOT))
1283 efi_apply_memmap_quirks();
1289 #ifdef CONFIG_X86_32
1291 static struct resource video_ram_resource = {
1292 .name = "Video RAM area",
1295 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
1298 void __init i386_reserve_resources(void)
1300 request_resource(&iomem_resource, &video_ram_resource);
1301 reserve_standard_io_resources();
1304 #endif /* CONFIG_X86_32 */
1306 static struct notifier_block kernel_offset_notifier = {
1307 .notifier_call = dump_kernel_offset
1310 static int __init register_kernel_offset_dumper(void)
1312 atomic_notifier_chain_register(&panic_notifier_list,
1313 &kernel_offset_notifier);
1316 __initcall(register_kernel_offset_dumper);