2 * Copyright (C) 1995 Linus Torvalds
4 * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999
6 * Memory region support
7 * David Parsons <orc@pell.chi.il.us>, July-August 1999
9 * Added E820 sanitization routine (removes overlapping memory regions);
10 * Brian Moyle <bmoyle@mvista.com>, February 2001
12 * Moved CPU detection code to cpu/${cpu}.c
13 * Patrick Mochel <mochel@osdl.org>, March 2002
15 * Provisions for empty E820 memory regions (reported by certain BIOSes).
16 * Alex Achenbach <xela@slit.de>, December 2002.
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/apm_bios.h>
31 #include <linux/initrd.h>
32 #include <linux/bootmem.h>
33 #include <linux/seq_file.h>
34 #include <linux/console.h>
35 #include <linux/mca.h>
36 #include <linux/root_dev.h>
37 #include <linux/highmem.h>
38 #include <linux/module.h>
39 #include <linux/efi.h>
40 #include <linux/init.h>
41 #include <linux/edd.h>
42 #include <linux/iscsi_ibft.h>
43 #include <linux/nodemask.h>
44 #include <linux/kexec.h>
45 #include <linux/dmi.h>
46 #include <linux/pfn.h>
47 #include <linux/pci.h>
48 #include <asm/pci-direct.h>
49 #include <linux/init_ohci1394_dma.h>
50 #include <linux/kvm_para.h>
52 #include <linux/errno.h>
53 #include <linux/kernel.h>
54 #include <linux/stddef.h>
55 #include <linux/unistd.h>
56 #include <linux/ptrace.h>
57 #include <linux/slab.h>
58 #include <linux/user.h>
59 #include <linux/delay.h>
61 #include <linux/kallsyms.h>
62 #include <linux/cpufreq.h>
63 #include <linux/dma-mapping.h>
64 #include <linux/ctype.h>
65 #include <linux/uaccess.h>
67 #include <linux/percpu.h>
68 #include <linux/crash_dump.h>
70 #include <video/edid.h>
75 #include <asm/mpspec.h>
76 #include <asm/setup.h>
77 #include <asm/arch_hooks.h>
79 #include <asm/sections.h>
81 #include <asm/io_apic.h>
84 #include <setup_arch.h>
85 #include <asm/bios_ebda.h>
86 #include <asm/cacheflush.h>
87 #include <asm/processor.h>
90 #include <asm/system.h>
91 #include <asm/vsyscall.h>
95 #include <asm/iommu.h>
97 #include <asm/mmu_context.h>
98 #include <asm/proto.h>
100 #include <mach_apic.h>
101 #include <asm/paravirt.h>
102 #include <asm/hypervisor.h>
104 #include <asm/percpu.h>
105 #include <asm/topology.h>
106 #include <asm/apicdef.h>
108 #include <asm/numa_64.h>
115 #ifndef CONFIG_DEBUG_BOOT_PARAMS
116 struct boot_params __initdata boot_params;
118 struct boot_params boot_params;
124 static struct resource data_resource = {
125 .name = "Kernel data",
128 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
131 static struct resource code_resource = {
132 .name = "Kernel code",
135 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
138 static struct resource bss_resource = {
139 .name = "Kernel bss",
142 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
147 /* This value is set up by the early boot code to point to the value
148 immediately after the boot time page tables. It contains a *physical*
149 address, and must not be in the .bss segment! */
150 unsigned long init_pg_tables_start __initdata = ~0UL;
151 unsigned long init_pg_tables_end __initdata = ~0UL;
153 static struct resource video_ram_resource = {
154 .name = "Video RAM area",
157 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
160 /* cpu data as detected by the assembly code in head.S */
161 struct cpuinfo_x86 new_cpu_data __cpuinitdata = {0, 0, 0, 0, -1, 1, 0, 0, -1};
162 /* common cpu data for all cpus */
163 struct cpuinfo_x86 boot_cpu_data __read_mostly = {0, 0, 0, 0, -1, 1, 0, 0, -1};
164 EXPORT_SYMBOL(boot_cpu_data);
165 static void set_mca_bus(int x)
172 unsigned int def_to_bigsmp;
174 /* for MCA, but anyone else can use it if they want */
175 unsigned int machine_id;
176 unsigned int machine_submodel_id;
177 unsigned int BIOS_revision;
179 struct apm_info apm_info;
180 EXPORT_SYMBOL(apm_info);
182 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
183 defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
184 struct ist_info ist_info;
185 EXPORT_SYMBOL(ist_info);
187 struct ist_info ist_info;
191 struct cpuinfo_x86 boot_cpu_data __read_mostly;
192 EXPORT_SYMBOL(boot_cpu_data);
196 #if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64)
197 unsigned long mmu_cr4_features;
199 unsigned long mmu_cr4_features = X86_CR4_PAE;
202 /* Boot loader ID as an integer, for the benefit of proc_dointvec */
209 char dmi_alloc_data[DMI_MAX_DATA];
214 struct screen_info screen_info;
215 EXPORT_SYMBOL(screen_info);
216 struct edid_info edid_info;
217 EXPORT_SYMBOL_GPL(edid_info);
219 extern int root_mountflags;
221 unsigned long saved_video_mode;
223 #define RAMDISK_IMAGE_START_MASK 0x07FF
224 #define RAMDISK_PROMPT_FLAG 0x8000
225 #define RAMDISK_LOAD_FLAG 0x4000
227 static char __initdata command_line[COMMAND_LINE_SIZE];
228 #ifdef CONFIG_CMDLINE_BOOL
229 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
232 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
234 #ifdef CONFIG_EDD_MODULE
238 * copy_edd() - Copy the BIOS EDD information
239 * from boot_params into a safe place.
242 static inline void copy_edd(void)
244 memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer,
245 sizeof(edd.mbr_signature));
246 memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
247 edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
248 edd.edd_info_nr = boot_params.eddbuf_entries;
251 static inline void copy_edd(void)
256 #ifdef CONFIG_BLK_DEV_INITRD
260 #define MAX_MAP_CHUNK (NR_FIX_BTMAPS << PAGE_SHIFT)
261 static void __init relocate_initrd(void)
264 u64 ramdisk_image = boot_params.hdr.ramdisk_image;
265 u64 ramdisk_size = boot_params.hdr.ramdisk_size;
266 u64 end_of_lowmem = max_low_pfn << PAGE_SHIFT;
268 unsigned long slop, clen, mapaddr;
271 /* We need to move the initrd down into lowmem */
272 ramdisk_here = find_e820_area(0, end_of_lowmem, ramdisk_size,
275 if (ramdisk_here == -1ULL)
276 panic("Cannot find place for new RAMDISK of size %lld\n",
279 /* Note: this includes all the lowmem currently occupied by
280 the initrd, we rely on that fact to keep the data intact. */
281 reserve_early(ramdisk_here, ramdisk_here + ramdisk_size,
283 initrd_start = ramdisk_here + PAGE_OFFSET;
284 initrd_end = initrd_start + ramdisk_size;
285 printk(KERN_INFO "Allocated new RAMDISK: %08llx - %08llx\n",
286 ramdisk_here, ramdisk_here + ramdisk_size);
288 q = (char *)initrd_start;
290 /* Copy any lowmem portion of the initrd */
291 if (ramdisk_image < end_of_lowmem) {
292 clen = end_of_lowmem - ramdisk_image;
293 p = (char *)__va(ramdisk_image);
296 ramdisk_image += clen;
297 ramdisk_size -= clen;
300 /* Copy the highmem portion of the initrd */
301 while (ramdisk_size) {
302 slop = ramdisk_image & ~PAGE_MASK;
304 if (clen > MAX_MAP_CHUNK-slop)
305 clen = MAX_MAP_CHUNK-slop;
306 mapaddr = ramdisk_image & PAGE_MASK;
307 p = early_memremap(mapaddr, clen+slop);
308 memcpy(q, p+slop, clen);
309 early_iounmap(p, clen+slop);
311 ramdisk_image += clen;
312 ramdisk_size -= clen;
314 /* high pages is not converted by early_res_to_bootmem */
315 ramdisk_image = boot_params.hdr.ramdisk_image;
316 ramdisk_size = boot_params.hdr.ramdisk_size;
317 printk(KERN_INFO "Move RAMDISK from %016llx - %016llx to"
318 " %08llx - %08llx\n",
319 ramdisk_image, ramdisk_image + ramdisk_size - 1,
320 ramdisk_here, ramdisk_here + ramdisk_size - 1);
324 static void __init reserve_initrd(void)
326 u64 ramdisk_image = boot_params.hdr.ramdisk_image;
327 u64 ramdisk_size = boot_params.hdr.ramdisk_size;
328 u64 ramdisk_end = ramdisk_image + ramdisk_size;
329 u64 end_of_lowmem = max_low_pfn << PAGE_SHIFT;
331 if (!boot_params.hdr.type_of_loader ||
332 !ramdisk_image || !ramdisk_size)
333 return; /* No initrd provided by bootloader */
337 if (ramdisk_size >= (end_of_lowmem>>1)) {
338 free_early(ramdisk_image, ramdisk_end);
339 printk(KERN_ERR "initrd too large to handle, "
340 "disabling initrd\n");
344 printk(KERN_INFO "RAMDISK: %08llx - %08llx\n", ramdisk_image,
348 if (ramdisk_end <= end_of_lowmem) {
349 /* All in lowmem, easy case */
351 * don't need to reserve again, already reserved early
352 * in i386_start_kernel
354 initrd_start = ramdisk_image + PAGE_OFFSET;
355 initrd_end = initrd_start + ramdisk_size;
362 printk(KERN_ERR "initrd extends beyond end of memory "
363 "(0x%08llx > 0x%08llx)\ndisabling initrd\n",
364 ramdisk_end, end_of_lowmem);
367 free_early(ramdisk_image, ramdisk_end);
370 static void __init reserve_initrd(void)
373 #endif /* CONFIG_BLK_DEV_INITRD */
375 static void __init parse_setup_data(void)
377 struct setup_data *data;
380 if (boot_params.hdr.version < 0x0209)
382 pa_data = boot_params.hdr.setup_data;
384 data = early_memremap(pa_data, PAGE_SIZE);
385 switch (data->type) {
387 parse_e820_ext(data, pa_data);
392 pa_data = data->next;
393 early_iounmap(data, PAGE_SIZE);
397 static void __init e820_reserve_setup_data(void)
399 struct setup_data *data;
403 if (boot_params.hdr.version < 0x0209)
405 pa_data = boot_params.hdr.setup_data;
407 data = early_memremap(pa_data, sizeof(*data));
408 e820_update_range(pa_data, sizeof(*data)+data->len,
409 E820_RAM, E820_RESERVED_KERN);
411 pa_data = data->next;
412 early_iounmap(data, sizeof(*data));
417 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
418 memcpy(&e820_saved, &e820, sizeof(struct e820map));
419 printk(KERN_INFO "extended physical RAM map:\n");
420 e820_print_map("reserve setup_data");
423 static void __init reserve_early_setup_data(void)
425 struct setup_data *data;
429 if (boot_params.hdr.version < 0x0209)
431 pa_data = boot_params.hdr.setup_data;
433 data = early_memremap(pa_data, sizeof(*data));
434 sprintf(buf, "setup data %x", data->type);
435 reserve_early(pa_data, pa_data+sizeof(*data)+data->len, buf);
436 pa_data = data->next;
437 early_iounmap(data, sizeof(*data));
442 * --------- Crashkernel reservation ------------------------------
448 * Reserve @size bytes of crashkernel memory at any suitable offset.
450 * @size: Size of the crashkernel memory to reserve.
451 * Returns the base address on success, and -1ULL on failure.
454 unsigned long long __init find_and_reserve_crashkernel(unsigned long long size)
456 const unsigned long long alignment = 16<<20; /* 16M */
457 unsigned long long start = 0LL;
462 start = find_e820_area(start, ULONG_MAX, size, alignment);
466 /* try to reserve it */
467 ret = reserve_bootmem_generic(start, size, BOOTMEM_EXCLUSIVE);
475 static inline unsigned long long get_total_mem(void)
477 unsigned long long total;
479 total = max_low_pfn - min_low_pfn;
480 #ifdef CONFIG_HIGHMEM
481 total += highend_pfn - highstart_pfn;
484 return total << PAGE_SHIFT;
487 static void __init reserve_crashkernel(void)
489 unsigned long long total_mem;
490 unsigned long long crash_size, crash_base;
493 total_mem = get_total_mem();
495 ret = parse_crashkernel(boot_command_line, total_mem,
496 &crash_size, &crash_base);
497 if (ret != 0 || crash_size <= 0)
500 /* 0 means: find the address automatically */
501 if (crash_base <= 0) {
502 crash_base = find_and_reserve_crashkernel(crash_size);
503 if (crash_base == -1ULL) {
504 pr_info("crashkernel reservation failed. "
505 "No suitable area found.\n");
509 ret = reserve_bootmem_generic(crash_base, crash_size,
512 pr_info("crashkernel reservation failed - "
513 "memory is in use\n");
518 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
519 "for crashkernel (System RAM: %ldMB)\n",
520 (unsigned long)(crash_size >> 20),
521 (unsigned long)(crash_base >> 20),
522 (unsigned long)(total_mem >> 20));
524 crashk_res.start = crash_base;
525 crashk_res.end = crash_base + crash_size - 1;
526 insert_resource(&iomem_resource, &crashk_res);
529 static void __init reserve_crashkernel(void)
534 static struct resource standard_io_resources[] = {
535 { .name = "dma1", .start = 0x00, .end = 0x1f,
536 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
537 { .name = "pic1", .start = 0x20, .end = 0x21,
538 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
539 { .name = "timer0", .start = 0x40, .end = 0x43,
540 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
541 { .name = "timer1", .start = 0x50, .end = 0x53,
542 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
543 { .name = "keyboard", .start = 0x60, .end = 0x60,
544 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
545 { .name = "keyboard", .start = 0x64, .end = 0x64,
546 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
547 { .name = "dma page reg", .start = 0x80, .end = 0x8f,
548 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
549 { .name = "pic2", .start = 0xa0, .end = 0xa1,
550 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
551 { .name = "dma2", .start = 0xc0, .end = 0xdf,
552 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
553 { .name = "fpu", .start = 0xf0, .end = 0xff,
554 .flags = IORESOURCE_BUSY | IORESOURCE_IO }
557 static void __init reserve_standard_io_resources(void)
561 /* request I/O space for devices used on all i[345]86 PCs */
562 for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
563 request_resource(&ioport_resource, &standard_io_resources[i]);
568 * Note: elfcorehdr_addr is not just limited to vmcore. It is also used by
569 * is_kdump_kernel() to determine if we are booting after a panic. Hence
570 * ifdef it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE.
573 #ifdef CONFIG_CRASH_DUMP
574 /* elfcorehdr= specifies the location of elf core header
575 * stored by the crashed kernel. This option will be passed
576 * by kexec loader to the capture kernel.
578 static int __init setup_elfcorehdr(char *arg)
583 elfcorehdr_addr = memparse(arg, &end);
584 return end > arg ? 0 : -EINVAL;
586 early_param("elfcorehdr", setup_elfcorehdr);
589 static int __init default_update_genapic(void)
591 #ifdef CONFIG_X86_SMP
592 # if defined(CONFIG_X86_GENERICARCH) || defined(CONFIG_X86_64)
593 genapic->wakeup_cpu = wakeup_secondary_cpu_via_init;
600 static struct x86_quirks default_x86_quirks __initdata = {
601 .update_genapic = default_update_genapic,
604 struct x86_quirks *x86_quirks __initdata = &default_x86_quirks;
606 #ifdef CONFIG_X86_RESERVE_LOW_64K
607 static int __init dmi_low_memory_corruption(const struct dmi_system_id *d)
610 "%s detected: BIOS may corrupt low RAM, working it around.\n",
613 e820_update_range(0, 0x10000, E820_RAM, E820_RESERVED);
614 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
620 /* List of systems that have known low memory corruption BIOS problems */
621 static struct dmi_system_id __initdata bad_bios_dmi_table[] = {
622 #ifdef CONFIG_X86_RESERVE_LOW_64K
624 .callback = dmi_low_memory_corruption,
627 DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
631 .callback = dmi_low_memory_corruption,
632 .ident = "Phoenix BIOS",
634 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies"),
642 * Determine if we were loaded by an EFI loader. If so, then we have also been
643 * passed the efi memmap, systab, etc., so we should use these data structures
644 * for initialization. Note, the efi init code path is determined by the
645 * global efi_enabled. This allows the same kernel image to be used on existing
646 * systems (with a traditional BIOS) as well as on EFI systems.
649 * setup_arch - architecture-specific boot-time initializations
651 * Note: On x86_64, fixmaps are ready for use even before this is called.
654 void __init setup_arch(char **cmdline_p)
657 memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
658 visws_early_detect();
659 pre_setup_arch_hook();
661 printk(KERN_INFO "Command line: %s\n", boot_command_line);
664 /* VMI may relocate the fixmap; do this before touching ioremap area */
668 early_ioremap_init();
670 ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
671 screen_info = boot_params.screen_info;
672 edid_info = boot_params.edid_info;
674 apm_info.bios = boot_params.apm_bios_info;
675 ist_info = boot_params.ist_info;
676 if (boot_params.sys_desc_table.length != 0) {
677 set_mca_bus(boot_params.sys_desc_table.table[3] & 0x2);
678 machine_id = boot_params.sys_desc_table.table[0];
679 machine_submodel_id = boot_params.sys_desc_table.table[1];
680 BIOS_revision = boot_params.sys_desc_table.table[2];
683 saved_video_mode = boot_params.hdr.vid_mode;
684 bootloader_type = boot_params.hdr.type_of_loader;
686 #ifdef CONFIG_BLK_DEV_RAM
687 rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
688 rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
689 rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
692 if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
708 /* update the e820_saved too */
709 e820_reserve_setup_data();
713 if (!boot_params.hdr.root_flags)
714 root_mountflags &= ~MS_RDONLY;
715 init_mm.start_code = (unsigned long) _text;
716 init_mm.end_code = (unsigned long) _etext;
717 init_mm.end_data = (unsigned long) _edata;
719 init_mm.brk = init_pg_tables_end + PAGE_OFFSET;
721 init_mm.brk = (unsigned long) &_end;
724 code_resource.start = virt_to_phys(_text);
725 code_resource.end = virt_to_phys(_etext)-1;
726 data_resource.start = virt_to_phys(_etext);
727 data_resource.end = virt_to_phys(_edata)-1;
728 bss_resource.start = virt_to_phys(&__bss_start);
729 bss_resource.end = virt_to_phys(&__bss_stop)-1;
731 #ifdef CONFIG_CMDLINE_BOOL
732 #ifdef CONFIG_CMDLINE_OVERRIDE
733 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
735 if (builtin_cmdline[0]) {
736 /* append boot loader cmdline to builtin */
737 strlcat(builtin_cmdline, " ", COMMAND_LINE_SIZE);
738 strlcat(builtin_cmdline, boot_command_line, COMMAND_LINE_SIZE);
739 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
744 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
745 *cmdline_p = command_line;
753 /* Must be before kernel pagetables are setup */
756 /* after early param, so could get panic from serial */
757 reserve_early_setup_data();
759 if (acpi_mps_check()) {
760 #ifdef CONFIG_X86_LOCAL_APIC
763 setup_clear_cpu_cap(X86_FEATURE_APIC);
767 if (pci_early_dump_regs)
768 early_dump_pci_devices();
771 finish_e820_parsing();
775 dmi_check_system(bad_bios_dmi_table);
778 * VMware detection requires dmi to be available, so this
779 * needs to be done after dmi_scan_machine, for the BP.
781 init_hypervisor(&boot_cpu_data);
787 /* after parse_early_param, so could debug it */
788 insert_resource(&iomem_resource, &code_resource);
789 insert_resource(&iomem_resource, &data_resource);
790 insert_resource(&iomem_resource, &bss_resource);
796 if (ppro_with_ram_bug()) {
797 e820_update_range(0x70000000ULL, 0x40000ULL, E820_RAM,
799 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
800 printk(KERN_INFO "fixed physical RAM map:\n");
801 e820_print_map("bad_ppro");
804 early_gart_iommu_check();
808 * partially used pages are not usable - thus
809 * we are rounding upwards:
811 max_pfn = e820_end_of_ram_pfn();
813 /* preallocate 4k for mptable mpc */
814 early_reserve_e820_mpc_new();
815 /* update e820 for memory not covered by WB MTRRs */
817 if (mtrr_trim_uncached_memory(max_pfn))
818 max_pfn = e820_end_of_ram_pfn();
821 /* max_low_pfn get updated here */
822 find_low_pfn_range();
824 num_physpages = max_pfn;
829 /* How many end-of-memory variables you have, grandma! */
830 /* need this before calling reserve_initrd */
831 if (max_pfn > (1UL<<(32 - PAGE_SHIFT)))
832 max_low_pfn = e820_end_of_low_ram_pfn();
834 max_low_pfn = max_pfn;
836 high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
839 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
840 setup_bios_corruption_check();
843 /* max_pfn_mapped is updated here */
844 max_low_pfn_mapped = init_memory_mapping(0, max_low_pfn<<PAGE_SHIFT);
845 max_pfn_mapped = max_low_pfn_mapped;
848 if (max_pfn > max_low_pfn) {
849 max_pfn_mapped = init_memory_mapping(1UL<<32,
850 max_pfn<<PAGE_SHIFT);
851 /* can we preseve max_low_pfn ?*/
852 max_low_pfn = max_pfn;
857 * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
860 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
861 if (init_ohci1394_dma_early)
862 init_ohci1394_dma_on_all_controllers();
874 * Parse the ACPI tables for possible boot-time SMP configuration.
876 acpi_boot_table_init();
878 early_acpi_boot_init();
880 #ifdef CONFIG_ACPI_NUMA
882 * Parse SRAT to discover nodes.
887 initmem_init(0, max_pfn);
889 #ifdef CONFIG_ACPI_SLEEP
891 * Reserve low memory region for sleep support.
893 acpi_reserve_bootmem();
895 #ifdef CONFIG_X86_FIND_SMP_CONFIG
897 * Find and reserve possible boot-time SMP configuration:
901 reserve_crashkernel();
905 * dma32_reserve_bootmem() allocates bootmem which may conflict
906 * with the crashkernel command line, so do that after
907 * reserve_crashkernel()
909 dma32_reserve_bootmem();
912 reserve_ibft_region();
914 #ifdef CONFIG_KVM_CLOCK
918 paravirt_pagetable_setup_start(swapper_pg_dir);
920 paravirt_pagetable_setup_done(swapper_pg_dir);
921 paravirt_post_allocator_init();
927 #ifdef CONFIG_X86_GENERICARCH
928 generic_apic_probe();
934 * Read APIC and some other early information from ACPI tables.
938 #if defined(CONFIG_X86_MPPARSE) || defined(CONFIG_X86_VISWS)
940 * get boot-time SMP configuration:
942 if (smp_found_config)
946 prefill_possible_map();
952 init_apic_mappings();
953 ioapic_init_mappings();
955 /* need to wait for io_apic is mapped */
960 e820_reserve_resources();
961 e820_mark_nosave_regions(max_low_pfn);
964 request_resource(&iomem_resource, &video_ram_resource);
966 reserve_standard_io_resources();
971 #if defined(CONFIG_VGA_CONSOLE)
972 if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
973 conswitchp = &vga_con;
974 #elif defined(CONFIG_DUMMY_CONSOLE)
975 conswitchp = &dummy_con;