2 * Copyright (C) 1995 Linus Torvalds
4 * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999
6 * Memory region support
9 * Added E820 sanitization routine (removes overlapping memory regions);
12 * Moved CPU detection code to cpu/${cpu}.c
15 * Provisions for empty E820 memory regions (reported by certain BIOSes).
21 * This file handles the architecture-dependent parts of initialization
24 #include <linux/sched.h>
26 #include <linux/mmzone.h>
27 #include <linux/screen_info.h>
28 #include <linux/ioport.h>
29 #include <linux/acpi.h>
30 #include <linux/sfi.h>
31 #include <linux/apm_bios.h>
32 #include <linux/initrd.h>
33 #include <linux/bootmem.h>
34 #include <linux/memblock.h>
35 #include <linux/seq_file.h>
36 #include <linux/console.h>
37 #include <linux/root_dev.h>
38 #include <linux/highmem.h>
39 #include <linux/module.h>
40 #include <linux/efi.h>
41 #include <linux/init.h>
42 #include <linux/edd.h>
43 #include <linux/iscsi_ibft.h>
44 #include <linux/nodemask.h>
45 #include <linux/kexec.h>
46 #include <linux/dmi.h>
47 #include <linux/pfn.h>
48 #include <linux/pci.h>
49 #include <asm/pci-direct.h>
50 #include <linux/init_ohci1394_dma.h>
51 #include <linux/kvm_para.h>
52 #include <linux/dma-contiguous.h>
54 #include <linux/errno.h>
55 #include <linux/kernel.h>
56 #include <linux/stddef.h>
57 #include <linux/unistd.h>
58 #include <linux/ptrace.h>
59 #include <linux/user.h>
60 #include <linux/delay.h>
62 #include <linux/kallsyms.h>
63 #include <linux/cpufreq.h>
64 #include <linux/dma-mapping.h>
65 #include <linux/ctype.h>
66 #include <linux/uaccess.h>
68 #include <linux/percpu.h>
69 #include <linux/crash_dump.h>
70 #include <linux/tboot.h>
71 #include <linux/jiffies.h>
73 #include <video/edid.h>
77 #include <asm/realmode.h>
79 #include <asm/mpspec.h>
80 #include <asm/setup.h>
82 #include <asm/timer.h>
83 #include <asm/i8259.h>
84 #include <asm/sections.h>
85 #include <asm/io_apic.h>
87 #include <asm/setup_arch.h>
88 #include <asm/bios_ebda.h>
89 #include <asm/cacheflush.h>
90 #include <asm/processor.h>
93 #include <asm/vsyscall.h>
97 #include <asm/iommu.h>
99 #include <asm/mmu_context.h>
100 #include <asm/proto.h>
102 #include <asm/paravirt.h>
103 #include <asm/hypervisor.h>
104 #include <asm/olpc_ofw.h>
106 #include <asm/percpu.h>
107 #include <asm/topology.h>
108 #include <asm/apicdef.h>
109 #include <asm/amd_nb.h>
111 #include <asm/alternative.h>
112 #include <asm/prom.h>
115 * max_low_pfn_mapped: highest direct mapped pfn under 4GB
116 * max_pfn_mapped: highest direct mapped pfn over 4GB
118 * The direct mapping only covers E820_RAM regions, so the ranges and gaps are
119 * represented by pfn_mapped
121 unsigned long max_low_pfn_mapped;
122 unsigned long max_pfn_mapped;
125 RESERVE_BRK(dmi_alloc, 65536);
129 static __initdata unsigned long _brk_start = (unsigned long)__brk_base;
130 unsigned long _brk_end = (unsigned long)__brk_base;
133 int default_cpu_present_to_apicid(int mps_cpu)
135 return __default_cpu_present_to_apicid(mps_cpu);
138 int default_check_phys_apicid_present(int phys_apicid)
140 return __default_check_phys_apicid_present(phys_apicid);
144 struct boot_params boot_params;
149 static struct resource data_resource = {
150 .name = "Kernel data",
153 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
156 static struct resource code_resource = {
157 .name = "Kernel code",
160 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
163 static struct resource bss_resource = {
164 .name = "Kernel bss",
167 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
172 /* cpu data as detected by the assembly code in head.S */
173 struct cpuinfo_x86 new_cpu_data = {
176 /* common cpu data for all cpus */
177 struct cpuinfo_x86 boot_cpu_data __read_mostly = {
180 EXPORT_SYMBOL(boot_cpu_data);
182 unsigned int def_to_bigsmp;
184 /* for MCA, but anyone else can use it if they want */
185 unsigned int machine_id;
186 unsigned int machine_submodel_id;
187 unsigned int BIOS_revision;
189 struct apm_info apm_info;
190 EXPORT_SYMBOL(apm_info);
192 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
193 defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
194 struct ist_info ist_info;
195 EXPORT_SYMBOL(ist_info);
197 struct ist_info ist_info;
201 struct cpuinfo_x86 boot_cpu_data __read_mostly = {
202 .x86_phys_bits = MAX_PHYSMEM_BITS,
204 EXPORT_SYMBOL(boot_cpu_data);
208 #if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64)
209 __visible unsigned long mmu_cr4_features;
211 __visible unsigned long mmu_cr4_features = X86_CR4_PAE;
214 /* Boot loader ID and version as integers, for the benefit of proc_dointvec */
215 int bootloader_type, bootloader_version;
220 struct screen_info screen_info;
221 EXPORT_SYMBOL(screen_info);
222 struct edid_info edid_info;
223 EXPORT_SYMBOL_GPL(edid_info);
225 extern int root_mountflags;
227 unsigned long saved_video_mode;
229 #define RAMDISK_IMAGE_START_MASK 0x07FF
230 #define RAMDISK_PROMPT_FLAG 0x8000
231 #define RAMDISK_LOAD_FLAG 0x4000
233 static char __initdata command_line[COMMAND_LINE_SIZE];
234 #ifdef CONFIG_CMDLINE_BOOL
235 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
238 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
240 #ifdef CONFIG_EDD_MODULE
244 * copy_edd() - Copy the BIOS EDD information
245 * from boot_params into a safe place.
248 static inline void __init copy_edd(void)
250 memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer,
251 sizeof(edd.mbr_signature));
252 memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
253 edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
254 edd.edd_info_nr = boot_params.eddbuf_entries;
257 static inline void __init copy_edd(void)
262 void * __init extend_brk(size_t size, size_t align)
264 size_t mask = align - 1;
267 BUG_ON(_brk_start == 0);
268 BUG_ON(align & mask);
270 _brk_end = (_brk_end + mask) & ~mask;
271 BUG_ON((char *)(_brk_end + size) > __brk_limit);
273 ret = (void *)_brk_end;
276 memset(ret, 0, size);
282 static void __init cleanup_highmap(void)
287 static void __init reserve_brk(void)
289 if (_brk_end > _brk_start)
290 memblock_reserve(__pa_symbol(_brk_start),
291 _brk_end - _brk_start);
293 /* Mark brk area as locked down and no longer taking any
298 u64 relocated_ramdisk;
300 #ifdef CONFIG_BLK_DEV_INITRD
302 static u64 __init get_ramdisk_image(void)
304 u64 ramdisk_image = boot_params.hdr.ramdisk_image;
306 ramdisk_image |= (u64)boot_params.ext_ramdisk_image << 32;
308 return ramdisk_image;
310 static u64 __init get_ramdisk_size(void)
312 u64 ramdisk_size = boot_params.hdr.ramdisk_size;
314 ramdisk_size |= (u64)boot_params.ext_ramdisk_size << 32;
319 #define MAX_MAP_CHUNK (NR_FIX_BTMAPS << PAGE_SHIFT)
320 static void __init relocate_initrd(void)
322 /* Assume only end is not page aligned */
323 u64 ramdisk_image = get_ramdisk_image();
324 u64 ramdisk_size = get_ramdisk_size();
325 u64 area_size = PAGE_ALIGN(ramdisk_size);
326 unsigned long slop, clen, mapaddr;
329 /* We need to move the initrd down into directly mapped mem */
330 relocated_ramdisk = memblock_find_in_range(0, PFN_PHYS(max_pfn_mapped),
331 area_size, PAGE_SIZE);
333 if (!relocated_ramdisk)
334 panic("Cannot find place for new RAMDISK of size %lld\n",
337 /* Note: this includes all the mem currently occupied by
338 the initrd, we rely on that fact to keep the data intact. */
339 memblock_reserve(relocated_ramdisk, area_size);
340 initrd_start = relocated_ramdisk + PAGE_OFFSET;
341 initrd_end = initrd_start + ramdisk_size;
342 printk(KERN_INFO "Allocated new RAMDISK: [mem %#010llx-%#010llx]\n",
343 relocated_ramdisk, relocated_ramdisk + ramdisk_size - 1);
345 q = (char *)initrd_start;
347 /* Copy the initrd */
348 while (ramdisk_size) {
349 slop = ramdisk_image & ~PAGE_MASK;
351 if (clen > MAX_MAP_CHUNK-slop)
352 clen = MAX_MAP_CHUNK-slop;
353 mapaddr = ramdisk_image & PAGE_MASK;
354 p = early_memremap(mapaddr, clen+slop);
355 memcpy(q, p+slop, clen);
356 early_iounmap(p, clen+slop);
358 ramdisk_image += clen;
359 ramdisk_size -= clen;
362 ramdisk_image = get_ramdisk_image();
363 ramdisk_size = get_ramdisk_size();
364 printk(KERN_INFO "Move RAMDISK from [mem %#010llx-%#010llx] to"
365 " [mem %#010llx-%#010llx]\n",
366 ramdisk_image, ramdisk_image + ramdisk_size - 1,
367 relocated_ramdisk, relocated_ramdisk + ramdisk_size - 1);
370 static void __init early_reserve_initrd(void)
372 /* Assume only end is not page aligned */
373 u64 ramdisk_image = get_ramdisk_image();
374 u64 ramdisk_size = get_ramdisk_size();
375 u64 ramdisk_end = PAGE_ALIGN(ramdisk_image + ramdisk_size);
377 if (!boot_params.hdr.type_of_loader ||
378 !ramdisk_image || !ramdisk_size)
379 return; /* No initrd provided by bootloader */
381 memblock_reserve(ramdisk_image, ramdisk_end - ramdisk_image);
383 static void __init reserve_initrd(void)
385 /* Assume only end is not page aligned */
386 u64 ramdisk_image = get_ramdisk_image();
387 u64 ramdisk_size = get_ramdisk_size();
388 u64 ramdisk_end = PAGE_ALIGN(ramdisk_image + ramdisk_size);
391 if (!boot_params.hdr.type_of_loader ||
392 !ramdisk_image || !ramdisk_size)
393 return; /* No initrd provided by bootloader */
397 mapped_size = memblock_mem_size(max_pfn_mapped);
398 if (ramdisk_size >= (mapped_size>>1))
399 panic("initrd too large to handle, "
400 "disabling initrd (%lld needed, %lld available)\n",
401 ramdisk_size, mapped_size>>1);
403 printk(KERN_INFO "RAMDISK: [mem %#010llx-%#010llx]\n", ramdisk_image,
406 if (pfn_range_is_mapped(PFN_DOWN(ramdisk_image),
407 PFN_DOWN(ramdisk_end))) {
408 /* All are mapped, easy case */
409 initrd_start = ramdisk_image + PAGE_OFFSET;
410 initrd_end = initrd_start + ramdisk_size;
416 memblock_free(ramdisk_image, ramdisk_end - ramdisk_image);
419 static void __init early_reserve_initrd(void)
422 static void __init reserve_initrd(void)
425 #endif /* CONFIG_BLK_DEV_INITRD */
427 static void __init parse_setup_data(void)
429 struct setup_data *data;
430 u64 pa_data, pa_next;
432 pa_data = boot_params.hdr.setup_data;
434 u32 data_len, map_len, data_type;
436 map_len = max(PAGE_SIZE - (pa_data & ~PAGE_MASK),
437 (u64)sizeof(struct setup_data));
438 data = early_memremap(pa_data, map_len);
439 data_len = data->len + sizeof(struct setup_data);
440 data_type = data->type;
441 pa_next = data->next;
442 early_iounmap(data, map_len);
446 parse_e820_ext(pa_data, data_len);
452 parse_efi_setup(pa_data, data_len);
461 static void __init e820_reserve_setup_data(void)
463 struct setup_data *data;
467 pa_data = boot_params.hdr.setup_data;
469 data = early_memremap(pa_data, sizeof(*data));
470 e820_update_range(pa_data, sizeof(*data)+data->len,
471 E820_RAM, E820_RESERVED_KERN);
473 pa_data = data->next;
474 early_iounmap(data, sizeof(*data));
479 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
480 memcpy(&e820_saved, &e820, sizeof(struct e820map));
481 printk(KERN_INFO "extended physical RAM map:\n");
482 e820_print_map("reserve setup_data");
485 static void __init memblock_x86_reserve_range_setup_data(void)
487 struct setup_data *data;
490 pa_data = boot_params.hdr.setup_data;
492 data = early_memremap(pa_data, sizeof(*data));
493 memblock_reserve(pa_data, sizeof(*data) + data->len);
494 pa_data = data->next;
495 early_iounmap(data, sizeof(*data));
500 * --------- Crashkernel reservation ------------------------------
506 * Keep the crash kernel below this limit. On 32 bits earlier kernels
507 * would limit the kernel to the low 512 MiB due to mapping restrictions.
508 * On 64bit, old kexec-tools need to under 896MiB.
511 # define CRASH_KERNEL_ADDR_LOW_MAX (512 << 20)
512 # define CRASH_KERNEL_ADDR_HIGH_MAX (512 << 20)
514 # define CRASH_KERNEL_ADDR_LOW_MAX (896UL<<20)
515 # define CRASH_KERNEL_ADDR_HIGH_MAX MAXMEM
518 static void __init reserve_crashkernel_low(void)
521 const unsigned long long alignment = 16<<20; /* 16M */
522 unsigned long long low_base = 0, low_size = 0;
523 unsigned long total_low_mem;
524 unsigned long long base;
525 bool auto_set = false;
528 total_low_mem = memblock_mem_size(1UL<<(32-PAGE_SHIFT));
529 /* crashkernel=Y,low */
530 ret = parse_crashkernel_low(boot_command_line, total_low_mem,
534 * two parts from lib/swiotlb.c:
535 * swiotlb size: user specified with swiotlb= or default.
536 * swiotlb overflow buffer: now is hardcoded to 32k.
537 * We round it to 8M for other buffers that
538 * may need to stay low too.
540 low_size = swiotlb_size_or_default() + (8UL<<20);
543 /* passed with crashkernel=0,low ? */
548 low_base = memblock_find_in_range(low_size, (1ULL<<32),
549 low_size, alignment);
553 pr_info("crashkernel low reservation failed - No suitable area found.\n");
558 memblock_reserve(low_base, low_size);
559 pr_info("Reserving %ldMB of low memory at %ldMB for crashkernel (System low RAM: %ldMB)\n",
560 (unsigned long)(low_size >> 20),
561 (unsigned long)(low_base >> 20),
562 (unsigned long)(total_low_mem >> 20));
563 crashk_low_res.start = low_base;
564 crashk_low_res.end = low_base + low_size - 1;
565 insert_resource(&iomem_resource, &crashk_low_res);
569 static void __init reserve_crashkernel(void)
571 const unsigned long long alignment = 16<<20; /* 16M */
572 unsigned long long total_mem;
573 unsigned long long crash_size, crash_base;
577 total_mem = memblock_phys_mem_size();
580 ret = parse_crashkernel(boot_command_line, total_mem,
581 &crash_size, &crash_base);
582 if (ret != 0 || crash_size <= 0) {
583 /* crashkernel=X,high */
584 ret = parse_crashkernel_high(boot_command_line, total_mem,
585 &crash_size, &crash_base);
586 if (ret != 0 || crash_size <= 0)
591 /* 0 means: find the address automatically */
592 if (crash_base <= 0) {
594 * kexec want bzImage is below CRASH_KERNEL_ADDR_MAX
596 crash_base = memblock_find_in_range(alignment,
597 high ? CRASH_KERNEL_ADDR_HIGH_MAX :
598 CRASH_KERNEL_ADDR_LOW_MAX,
599 crash_size, alignment);
602 pr_info("crashkernel reservation failed - No suitable area found.\n");
607 unsigned long long start;
609 start = memblock_find_in_range(crash_base,
610 crash_base + crash_size, crash_size, 1<<20);
611 if (start != crash_base) {
612 pr_info("crashkernel reservation failed - memory is in use.\n");
616 memblock_reserve(crash_base, crash_size);
618 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
619 "for crashkernel (System RAM: %ldMB)\n",
620 (unsigned long)(crash_size >> 20),
621 (unsigned long)(crash_base >> 20),
622 (unsigned long)(total_mem >> 20));
624 crashk_res.start = crash_base;
625 crashk_res.end = crash_base + crash_size - 1;
626 insert_resource(&iomem_resource, &crashk_res);
628 if (crash_base >= (1ULL<<32))
629 reserve_crashkernel_low();
632 static void __init reserve_crashkernel(void)
637 static struct resource standard_io_resources[] = {
638 { .name = "dma1", .start = 0x00, .end = 0x1f,
639 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
640 { .name = "pic1", .start = 0x20, .end = 0x21,
641 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
642 { .name = "timer0", .start = 0x40, .end = 0x43,
643 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
644 { .name = "timer1", .start = 0x50, .end = 0x53,
645 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
646 { .name = "keyboard", .start = 0x60, .end = 0x60,
647 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
648 { .name = "keyboard", .start = 0x64, .end = 0x64,
649 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
650 { .name = "dma page reg", .start = 0x80, .end = 0x8f,
651 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
652 { .name = "pic2", .start = 0xa0, .end = 0xa1,
653 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
654 { .name = "dma2", .start = 0xc0, .end = 0xdf,
655 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
656 { .name = "fpu", .start = 0xf0, .end = 0xff,
657 .flags = IORESOURCE_BUSY | IORESOURCE_IO }
660 void __init reserve_standard_io_resources(void)
664 /* request I/O space for devices used on all i[345]86 PCs */
665 for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
666 request_resource(&ioport_resource, &standard_io_resources[i]);
670 static __init void reserve_ibft_region(void)
672 unsigned long addr, size = 0;
674 addr = find_ibft_region(&size);
677 memblock_reserve(addr, size);
680 static bool __init snb_gfx_workaround_needed(void)
685 static const __initconst u16 snb_ids[] = {
695 /* Assume no if something weird is going on with PCI */
696 if (!early_pci_allowed())
699 vendor = read_pci_config_16(0, 2, 0, PCI_VENDOR_ID);
700 if (vendor != 0x8086)
703 devid = read_pci_config_16(0, 2, 0, PCI_DEVICE_ID);
704 for (i = 0; i < ARRAY_SIZE(snb_ids); i++)
705 if (devid == snb_ids[i])
713 * Sandy Bridge graphics has trouble with certain ranges, exclude
714 * them from allocation.
716 static void __init trim_snb_memory(void)
718 static const __initconst unsigned long bad_pages[] = {
727 if (!snb_gfx_workaround_needed())
730 printk(KERN_DEBUG "reserving inaccessible SNB gfx pages\n");
733 * Reserve all memory below the 1 MB mark that has not
734 * already been reserved.
736 memblock_reserve(0, 1<<20);
738 for (i = 0; i < ARRAY_SIZE(bad_pages); i++) {
739 if (memblock_reserve(bad_pages[i], PAGE_SIZE))
740 printk(KERN_WARNING "failed to reserve 0x%08lx\n",
746 * Here we put platform-specific memory range workarounds, i.e.
747 * memory known to be corrupt or otherwise in need to be reserved on
748 * specific platforms.
750 * If this gets used more widely it could use a real dispatch mechanism.
752 static void __init trim_platform_memory_ranges(void)
757 static void __init trim_bios_range(void)
760 * A special case is the first 4Kb of memory;
761 * This is a BIOS owned area, not kernel ram, but generally
762 * not listed as such in the E820 table.
764 * This typically reserves additional memory (64KiB by default)
765 * since some BIOSes are known to corrupt low memory. See the
766 * Kconfig help text for X86_RESERVE_LOW.
768 e820_update_range(0, PAGE_SIZE, E820_RAM, E820_RESERVED);
771 * special case: Some BIOSen report the PC BIOS
772 * area (640->1Mb) as ram even though it is not.
775 e820_remove_range(BIOS_BEGIN, BIOS_END - BIOS_BEGIN, E820_RAM, 1);
777 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
780 /* called before trim_bios_range() to spare extra sanitize */
781 static void __init e820_add_kernel_range(void)
783 u64 start = __pa_symbol(_text);
784 u64 size = __pa_symbol(_end) - start;
787 * Complain if .text .data and .bss are not marked as E820_RAM and
788 * attempt to fix it by adding the range. We may have a confused BIOS,
789 * or the user may have used memmap=exactmap or memmap=xxM$yyM to
790 * exclude kernel range. If we really are running on top non-RAM,
791 * we will crash later anyways.
793 if (e820_all_mapped(start, start + size, E820_RAM))
796 pr_warn(".text .data .bss are not marked as E820_RAM!\n");
797 e820_remove_range(start, size, E820_RAM, 0);
798 e820_add_region(start, size, E820_RAM);
801 static unsigned reserve_low = CONFIG_X86_RESERVE_LOW << 10;
803 static int __init parse_reservelow(char *p)
805 unsigned long long size;
810 size = memparse(p, &p);
823 early_param("reservelow", parse_reservelow);
825 static void __init trim_low_memory_range(void)
827 memblock_reserve(0, ALIGN(reserve_low, PAGE_SIZE));
831 * Dump out kernel offset information on panic.
834 dump_kernel_offset(struct notifier_block *self, unsigned long v, void *p)
836 pr_emerg("Kernel Offset: 0x%lx from 0x%lx "
837 "(relocation range: 0x%lx-0x%lx)\n",
838 (unsigned long)&_text - __START_KERNEL, __START_KERNEL,
839 __START_KERNEL_map, MODULES_VADDR-1);
845 * Determine if we were loaded by an EFI loader. If so, then we have also been
846 * passed the efi memmap, systab, etc., so we should use these data structures
847 * for initialization. Note, the efi init code path is determined by the
848 * global efi_enabled. This allows the same kernel image to be used on existing
849 * systems (with a traditional BIOS) as well as on EFI systems.
852 * setup_arch - architecture-specific boot-time initializations
854 * Note: On x86_64, fixmaps are ready for use even before this is called.
857 void __init setup_arch(char **cmdline_p)
859 memblock_reserve(__pa_symbol(_text),
860 (unsigned long)__bss_stop - (unsigned long)_text);
862 early_reserve_initrd();
865 * At this point everything still needed from the boot loader
866 * or BIOS or kernel text should be early reserved or marked not
867 * RAM in e820. All other memory is free game.
871 memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
874 * copy kernel address range established so far and switch
875 * to the proper swapper page table
877 clone_pgd_range(swapper_pg_dir + KERNEL_PGD_BOUNDARY,
878 initial_page_table + KERNEL_PGD_BOUNDARY,
881 load_cr3(swapper_pg_dir);
884 printk(KERN_INFO "Command line: %s\n", boot_command_line);
888 * If we have OLPC OFW, we might end up relocating the fixmap due to
889 * reserve_top(), so do this before touching the ioremap area.
895 early_ioremap_init();
897 setup_olpc_ofw_pgd();
899 ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
900 screen_info = boot_params.screen_info;
901 edid_info = boot_params.edid_info;
903 apm_info.bios = boot_params.apm_bios_info;
904 ist_info = boot_params.ist_info;
905 if (boot_params.sys_desc_table.length != 0) {
906 machine_id = boot_params.sys_desc_table.table[0];
907 machine_submodel_id = boot_params.sys_desc_table.table[1];
908 BIOS_revision = boot_params.sys_desc_table.table[2];
911 saved_video_mode = boot_params.hdr.vid_mode;
912 bootloader_type = boot_params.hdr.type_of_loader;
913 if ((bootloader_type >> 4) == 0xe) {
914 bootloader_type &= 0xf;
915 bootloader_type |= (boot_params.hdr.ext_loader_type+0x10) << 4;
917 bootloader_version = bootloader_type & 0xf;
918 bootloader_version |= boot_params.hdr.ext_loader_ver << 4;
920 #ifdef CONFIG_BLK_DEV_RAM
921 rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
922 rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
923 rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
926 if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
928 set_bit(EFI_BOOT, &efi.flags);
929 } else if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
931 set_bit(EFI_BOOT, &efi.flags);
932 set_bit(EFI_64BIT, &efi.flags);
935 if (efi_enabled(EFI_BOOT))
936 efi_memblock_x86_reserve_range();
939 x86_init.oem.arch_setup();
941 iomem_resource.end = (1ULL << boot_cpu_data.x86_phys_bits) - 1;
947 if (!boot_params.hdr.root_flags)
948 root_mountflags &= ~MS_RDONLY;
949 init_mm.start_code = (unsigned long) _text;
950 init_mm.end_code = (unsigned long) _etext;
951 init_mm.end_data = (unsigned long) _edata;
952 init_mm.brk = _brk_end;
954 code_resource.start = __pa_symbol(_text);
955 code_resource.end = __pa_symbol(_etext)-1;
956 data_resource.start = __pa_symbol(_etext);
957 data_resource.end = __pa_symbol(_edata)-1;
958 bss_resource.start = __pa_symbol(__bss_start);
959 bss_resource.end = __pa_symbol(__bss_stop)-1;
961 #ifdef CONFIG_CMDLINE_BOOL
962 #ifdef CONFIG_CMDLINE_OVERRIDE
963 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
965 if (builtin_cmdline[0]) {
966 /* append boot loader cmdline to builtin */
967 strlcat(builtin_cmdline, " ", COMMAND_LINE_SIZE);
968 strlcat(builtin_cmdline, boot_command_line, COMMAND_LINE_SIZE);
969 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
974 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
975 *cmdline_p = command_line;
978 * x86_configure_nx() is called before parse_early_param() to detect
979 * whether hardware doesn't support NX (so that the early EHCI debug
980 * console setup can safely call set_fixmap()). It may then be called
981 * again from within noexec_setup() during parsing early parameters
982 * to honor the respective command line option.
990 /* after early param, so could get panic from serial */
991 memblock_x86_reserve_range_setup_data();
993 if (acpi_mps_check()) {
994 #ifdef CONFIG_X86_LOCAL_APIC
997 setup_clear_cpu_cap(X86_FEATURE_APIC);
1001 if (pci_early_dump_regs)
1002 early_dump_pci_devices();
1005 /* update the e820_saved too */
1006 e820_reserve_setup_data();
1007 finish_e820_parsing();
1009 if (efi_enabled(EFI_BOOT))
1014 dmi_set_dump_stack_arch_desc();
1017 * VMware detection requires dmi to be available, so this
1018 * needs to be done after dmi_scan_machine, for the BP.
1020 init_hypervisor_platform();
1022 x86_init.resources.probe_roms();
1024 /* after parse_early_param, so could debug it */
1025 insert_resource(&iomem_resource, &code_resource);
1026 insert_resource(&iomem_resource, &data_resource);
1027 insert_resource(&iomem_resource, &bss_resource);
1029 e820_add_kernel_range();
1031 #ifdef CONFIG_X86_32
1032 if (ppro_with_ram_bug()) {
1033 e820_update_range(0x70000000ULL, 0x40000ULL, E820_RAM,
1035 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
1036 printk(KERN_INFO "fixed physical RAM map:\n");
1037 e820_print_map("bad_ppro");
1040 early_gart_iommu_check();
1044 * partially used pages are not usable - thus
1045 * we are rounding upwards:
1047 max_pfn = e820_end_of_ram_pfn();
1049 /* update e820 for memory not covered by WB MTRRs */
1051 if (mtrr_trim_uncached_memory(max_pfn))
1052 max_pfn = e820_end_of_ram_pfn();
1054 #ifdef CONFIG_X86_32
1055 /* max_low_pfn get updated here */
1056 find_low_pfn_range();
1060 /* How many end-of-memory variables you have, grandma! */
1061 /* need this before calling reserve_initrd */
1062 if (max_pfn > (1UL<<(32 - PAGE_SHIFT)))
1063 max_low_pfn = e820_end_of_low_ram_pfn();
1065 max_low_pfn = max_pfn;
1067 high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
1071 * Find and reserve possible boot-time SMP configuration:
1075 reserve_ibft_region();
1077 early_alloc_pgt_buf();
1080 * Need to conclude brk, before memblock_x86_fill()
1081 * it could use memblock_find_in_range, could overlap with
1088 memblock_set_current_limit(ISA_END_ADDRESS);
1089 memblock_x86_fill();
1092 * The EFI specification says that boot service code won't be called
1093 * after ExitBootServices(). This is, in fact, a lie.
1095 if (efi_enabled(EFI_MEMMAP))
1096 efi_reserve_boot_services();
1098 /* preallocate 4k for mptable mpc */
1099 early_reserve_e820_mpc_new();
1101 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
1102 setup_bios_corruption_check();
1105 #ifdef CONFIG_X86_32
1106 printk(KERN_DEBUG "initial memory mapped: [mem 0x00000000-%#010lx]\n",
1107 (max_pfn_mapped<<PAGE_SHIFT) - 1);
1110 reserve_real_mode();
1112 trim_platform_memory_ranges();
1113 trim_low_memory_range();
1117 early_trap_pf_init();
1121 memblock_set_current_limit(get_max_mapped());
1122 dma_contiguous_reserve(0);
1125 * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
1128 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
1129 if (init_ohci1394_dma_early)
1130 init_ohci1394_dma_on_all_controllers();
1132 /* Allocate bigger log buffer */
1137 #if defined(CONFIG_ACPI) && defined(CONFIG_BLK_DEV_INITRD)
1138 acpi_initrd_override((void *)initrd_start, initrd_end - initrd_start);
1146 * Parse the ACPI tables for possible boot-time SMP configuration.
1148 acpi_boot_table_init();
1150 early_acpi_boot_init();
1155 * Reserve memory for crash kernel after SRAT is parsed so that it
1156 * won't consume hotpluggable memory.
1158 reserve_crashkernel();
1160 memblock_find_dma_reserve();
1162 #ifdef CONFIG_KVM_GUEST
1166 x86_init.paging.pagetable_init();
1168 if (boot_cpu_data.cpuid_level >= 0) {
1169 /* A CPU has %cr4 if and only if it has CPUID */
1170 mmu_cr4_features = read_cr4();
1171 if (trampoline_cr4_features)
1172 *trampoline_cr4_features = mmu_cr4_features;
1175 #ifdef CONFIG_X86_32
1176 /* sync back kernel address range */
1177 clone_pgd_range(initial_page_table + KERNEL_PGD_BOUNDARY,
1178 swapper_pg_dir + KERNEL_PGD_BOUNDARY,
1184 #ifdef CONFIG_X86_64
1188 generic_apic_probe();
1193 * Read APIC and some other early information from ACPI tables.
1200 * get boot-time SMP configuration:
1202 if (smp_found_config)
1205 prefill_possible_map();
1209 init_apic_mappings();
1210 if (x86_io_apic_ops.init)
1211 x86_io_apic_ops.init();
1215 e820_reserve_resources();
1216 e820_mark_nosave_regions(max_low_pfn);
1218 x86_init.resources.reserve_resources();
1223 #if defined(CONFIG_VGA_CONSOLE)
1224 if (!efi_enabled(EFI_BOOT) || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
1225 conswitchp = &vga_con;
1226 #elif defined(CONFIG_DUMMY_CONSOLE)
1227 conswitchp = &dummy_con;
1230 x86_init.oem.banner();
1232 x86_init.timers.wallclock_init();
1236 arch_init_ideal_nops();
1238 register_refined_jiffies(CLOCK_TICK_RATE);
1241 if (efi_enabled(EFI_BOOT))
1242 efi_apply_memmap_quirks();
1246 #ifdef CONFIG_X86_32
1248 static struct resource video_ram_resource = {
1249 .name = "Video RAM area",
1252 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
1255 void __init i386_reserve_resources(void)
1257 request_resource(&iomem_resource, &video_ram_resource);
1258 reserve_standard_io_resources();
1261 #endif /* CONFIG_X86_32 */
1263 static struct notifier_block kernel_offset_notifier = {
1264 .notifier_call = dump_kernel_offset
1267 static int __init register_kernel_offset_dumper(void)
1269 atomic_notifier_chain_register(&panic_notifier_list,
1270 &kernel_offset_notifier);
1273 __initcall(register_kernel_offset_dumper);