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 <asm/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 <asm/genapic.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 unsigned int boot_cpu_id __read_mostly;
118 int default_cpu_present_to_apicid(int mps_cpu)
120 return __default_cpu_present_to_apicid(mps_cpu);
123 int default_check_phys_apicid_present(int boot_cpu_physical_apicid)
125 return __default_check_phys_apicid_present(boot_cpu_physical_apicid);
129 #ifndef CONFIG_DEBUG_BOOT_PARAMS
130 struct boot_params __initdata boot_params;
132 struct boot_params boot_params;
138 static struct resource data_resource = {
139 .name = "Kernel data",
142 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
145 static struct resource code_resource = {
146 .name = "Kernel code",
149 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
152 static struct resource bss_resource = {
153 .name = "Kernel bss",
156 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
161 /* This value is set up by the early boot code to point to the value
162 immediately after the boot time page tables. It contains a *physical*
163 address, and must not be in the .bss segment! */
164 unsigned long init_pg_tables_start __initdata = ~0UL;
165 unsigned long init_pg_tables_end __initdata = ~0UL;
167 static struct resource video_ram_resource = {
168 .name = "Video RAM area",
171 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
174 /* cpu data as detected by the assembly code in head.S */
175 struct cpuinfo_x86 new_cpu_data __cpuinitdata = {0, 0, 0, 0, -1, 1, 0, 0, -1};
176 /* common cpu data for all cpus */
177 struct cpuinfo_x86 boot_cpu_data __read_mostly = {0, 0, 0, 0, -1, 1, 0, 0, -1};
178 EXPORT_SYMBOL(boot_cpu_data);
179 static void set_mca_bus(int x)
186 unsigned int def_to_bigsmp;
188 /* for MCA, but anyone else can use it if they want */
189 unsigned int machine_id;
190 unsigned int machine_submodel_id;
191 unsigned int BIOS_revision;
193 struct apm_info apm_info;
194 EXPORT_SYMBOL(apm_info);
196 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
197 defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
198 struct ist_info ist_info;
199 EXPORT_SYMBOL(ist_info);
201 struct ist_info ist_info;
205 struct cpuinfo_x86 boot_cpu_data __read_mostly;
206 EXPORT_SYMBOL(boot_cpu_data);
210 #if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64)
211 unsigned long mmu_cr4_features;
213 unsigned long mmu_cr4_features = X86_CR4_PAE;
216 /* Boot loader ID as an integer, for the benefit of proc_dointvec */
223 char dmi_alloc_data[DMI_MAX_DATA];
228 struct screen_info screen_info;
229 EXPORT_SYMBOL(screen_info);
230 struct edid_info edid_info;
231 EXPORT_SYMBOL_GPL(edid_info);
233 extern int root_mountflags;
235 unsigned long saved_video_mode;
237 #define RAMDISK_IMAGE_START_MASK 0x07FF
238 #define RAMDISK_PROMPT_FLAG 0x8000
239 #define RAMDISK_LOAD_FLAG 0x4000
241 static char __initdata command_line[COMMAND_LINE_SIZE];
242 #ifdef CONFIG_CMDLINE_BOOL
243 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
246 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
248 #ifdef CONFIG_EDD_MODULE
252 * copy_edd() - Copy the BIOS EDD information
253 * from boot_params into a safe place.
256 static inline void copy_edd(void)
258 memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer,
259 sizeof(edd.mbr_signature));
260 memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
261 edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
262 edd.edd_info_nr = boot_params.eddbuf_entries;
265 static inline void copy_edd(void)
270 #ifdef CONFIG_BLK_DEV_INITRD
274 #define MAX_MAP_CHUNK (NR_FIX_BTMAPS << PAGE_SHIFT)
275 static void __init relocate_initrd(void)
278 u64 ramdisk_image = boot_params.hdr.ramdisk_image;
279 u64 ramdisk_size = boot_params.hdr.ramdisk_size;
280 u64 end_of_lowmem = max_low_pfn << PAGE_SHIFT;
282 unsigned long slop, clen, mapaddr;
285 /* We need to move the initrd down into lowmem */
286 ramdisk_here = find_e820_area(0, end_of_lowmem, ramdisk_size,
289 if (ramdisk_here == -1ULL)
290 panic("Cannot find place for new RAMDISK of size %lld\n",
293 /* Note: this includes all the lowmem currently occupied by
294 the initrd, we rely on that fact to keep the data intact. */
295 reserve_early(ramdisk_here, ramdisk_here + ramdisk_size,
297 initrd_start = ramdisk_here + PAGE_OFFSET;
298 initrd_end = initrd_start + ramdisk_size;
299 printk(KERN_INFO "Allocated new RAMDISK: %08llx - %08llx\n",
300 ramdisk_here, ramdisk_here + ramdisk_size);
302 q = (char *)initrd_start;
304 /* Copy any lowmem portion of the initrd */
305 if (ramdisk_image < end_of_lowmem) {
306 clen = end_of_lowmem - ramdisk_image;
307 p = (char *)__va(ramdisk_image);
310 ramdisk_image += clen;
311 ramdisk_size -= clen;
314 /* Copy the highmem portion of the initrd */
315 while (ramdisk_size) {
316 slop = ramdisk_image & ~PAGE_MASK;
318 if (clen > MAX_MAP_CHUNK-slop)
319 clen = MAX_MAP_CHUNK-slop;
320 mapaddr = ramdisk_image & PAGE_MASK;
321 p = early_memremap(mapaddr, clen+slop);
322 memcpy(q, p+slop, clen);
323 early_iounmap(p, clen+slop);
325 ramdisk_image += clen;
326 ramdisk_size -= clen;
328 /* high pages is not converted by early_res_to_bootmem */
329 ramdisk_image = boot_params.hdr.ramdisk_image;
330 ramdisk_size = boot_params.hdr.ramdisk_size;
331 printk(KERN_INFO "Move RAMDISK from %016llx - %016llx to"
332 " %08llx - %08llx\n",
333 ramdisk_image, ramdisk_image + ramdisk_size - 1,
334 ramdisk_here, ramdisk_here + ramdisk_size - 1);
338 static void __init reserve_initrd(void)
340 u64 ramdisk_image = boot_params.hdr.ramdisk_image;
341 u64 ramdisk_size = boot_params.hdr.ramdisk_size;
342 u64 ramdisk_end = ramdisk_image + ramdisk_size;
343 u64 end_of_lowmem = max_low_pfn << PAGE_SHIFT;
345 if (!boot_params.hdr.type_of_loader ||
346 !ramdisk_image || !ramdisk_size)
347 return; /* No initrd provided by bootloader */
351 if (ramdisk_size >= (end_of_lowmem>>1)) {
352 free_early(ramdisk_image, ramdisk_end);
353 printk(KERN_ERR "initrd too large to handle, "
354 "disabling initrd\n");
358 printk(KERN_INFO "RAMDISK: %08llx - %08llx\n", ramdisk_image,
362 if (ramdisk_end <= end_of_lowmem) {
363 /* All in lowmem, easy case */
365 * don't need to reserve again, already reserved early
366 * in i386_start_kernel
368 initrd_start = ramdisk_image + PAGE_OFFSET;
369 initrd_end = initrd_start + ramdisk_size;
376 printk(KERN_ERR "initrd extends beyond end of memory "
377 "(0x%08llx > 0x%08llx)\ndisabling initrd\n",
378 ramdisk_end, end_of_lowmem);
381 free_early(ramdisk_image, ramdisk_end);
384 static void __init reserve_initrd(void)
387 #endif /* CONFIG_BLK_DEV_INITRD */
389 static void __init parse_setup_data(void)
391 struct setup_data *data;
394 if (boot_params.hdr.version < 0x0209)
396 pa_data = boot_params.hdr.setup_data;
398 data = early_memremap(pa_data, PAGE_SIZE);
399 switch (data->type) {
401 parse_e820_ext(data, pa_data);
406 pa_data = data->next;
407 early_iounmap(data, PAGE_SIZE);
411 static void __init e820_reserve_setup_data(void)
413 struct setup_data *data;
417 if (boot_params.hdr.version < 0x0209)
419 pa_data = boot_params.hdr.setup_data;
421 data = early_memremap(pa_data, sizeof(*data));
422 e820_update_range(pa_data, sizeof(*data)+data->len,
423 E820_RAM, E820_RESERVED_KERN);
425 pa_data = data->next;
426 early_iounmap(data, sizeof(*data));
431 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
432 memcpy(&e820_saved, &e820, sizeof(struct e820map));
433 printk(KERN_INFO "extended physical RAM map:\n");
434 e820_print_map("reserve setup_data");
437 static void __init reserve_early_setup_data(void)
439 struct setup_data *data;
443 if (boot_params.hdr.version < 0x0209)
445 pa_data = boot_params.hdr.setup_data;
447 data = early_memremap(pa_data, sizeof(*data));
448 sprintf(buf, "setup data %x", data->type);
449 reserve_early(pa_data, pa_data+sizeof(*data)+data->len, buf);
450 pa_data = data->next;
451 early_iounmap(data, sizeof(*data));
456 * --------- Crashkernel reservation ------------------------------
462 * Reserve @size bytes of crashkernel memory at any suitable offset.
464 * @size: Size of the crashkernel memory to reserve.
465 * Returns the base address on success, and -1ULL on failure.
468 unsigned long long __init find_and_reserve_crashkernel(unsigned long long size)
470 const unsigned long long alignment = 16<<20; /* 16M */
471 unsigned long long start = 0LL;
476 start = find_e820_area(start, ULONG_MAX, size, alignment);
480 /* try to reserve it */
481 ret = reserve_bootmem_generic(start, size, BOOTMEM_EXCLUSIVE);
489 static inline unsigned long long get_total_mem(void)
491 unsigned long long total;
493 total = max_low_pfn - min_low_pfn;
494 #ifdef CONFIG_HIGHMEM
495 total += highend_pfn - highstart_pfn;
498 return total << PAGE_SHIFT;
501 static void __init reserve_crashkernel(void)
503 unsigned long long total_mem;
504 unsigned long long crash_size, crash_base;
507 total_mem = get_total_mem();
509 ret = parse_crashkernel(boot_command_line, total_mem,
510 &crash_size, &crash_base);
511 if (ret != 0 || crash_size <= 0)
514 /* 0 means: find the address automatically */
515 if (crash_base <= 0) {
516 crash_base = find_and_reserve_crashkernel(crash_size);
517 if (crash_base == -1ULL) {
518 pr_info("crashkernel reservation failed. "
519 "No suitable area found.\n");
523 ret = reserve_bootmem_generic(crash_base, crash_size,
526 pr_info("crashkernel reservation failed - "
527 "memory is in use\n");
532 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
533 "for crashkernel (System RAM: %ldMB)\n",
534 (unsigned long)(crash_size >> 20),
535 (unsigned long)(crash_base >> 20),
536 (unsigned long)(total_mem >> 20));
538 crashk_res.start = crash_base;
539 crashk_res.end = crash_base + crash_size - 1;
540 insert_resource(&iomem_resource, &crashk_res);
543 static void __init reserve_crashkernel(void)
548 static struct resource standard_io_resources[] = {
549 { .name = "dma1", .start = 0x00, .end = 0x1f,
550 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
551 { .name = "pic1", .start = 0x20, .end = 0x21,
552 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
553 { .name = "timer0", .start = 0x40, .end = 0x43,
554 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
555 { .name = "timer1", .start = 0x50, .end = 0x53,
556 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
557 { .name = "keyboard", .start = 0x60, .end = 0x60,
558 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
559 { .name = "keyboard", .start = 0x64, .end = 0x64,
560 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
561 { .name = "dma page reg", .start = 0x80, .end = 0x8f,
562 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
563 { .name = "pic2", .start = 0xa0, .end = 0xa1,
564 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
565 { .name = "dma2", .start = 0xc0, .end = 0xdf,
566 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
567 { .name = "fpu", .start = 0xf0, .end = 0xff,
568 .flags = IORESOURCE_BUSY | IORESOURCE_IO }
571 static void __init reserve_standard_io_resources(void)
575 /* request I/O space for devices used on all i[345]86 PCs */
576 for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
577 request_resource(&ioport_resource, &standard_io_resources[i]);
582 * Note: elfcorehdr_addr is not just limited to vmcore. It is also used by
583 * is_kdump_kernel() to determine if we are booting after a panic. Hence
584 * ifdef it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE.
587 #ifdef CONFIG_CRASH_DUMP
588 /* elfcorehdr= specifies the location of elf core header
589 * stored by the crashed kernel. This option will be passed
590 * by kexec loader to the capture kernel.
592 static int __init setup_elfcorehdr(char *arg)
597 elfcorehdr_addr = memparse(arg, &end);
598 return end > arg ? 0 : -EINVAL;
600 early_param("elfcorehdr", setup_elfcorehdr);
603 static int __init default_update_genapic(void)
606 if (!apic->wakeup_cpu)
607 apic->wakeup_cpu = wakeup_secondary_cpu_via_init;
613 static struct x86_quirks default_x86_quirks __initdata = {
614 .update_genapic = default_update_genapic,
617 struct x86_quirks *x86_quirks __initdata = &default_x86_quirks;
619 #ifdef CONFIG_X86_RESERVE_LOW_64K
620 static int __init dmi_low_memory_corruption(const struct dmi_system_id *d)
623 "%s detected: BIOS may corrupt low RAM, working around it.\n",
626 e820_update_range(0, 0x10000, E820_RAM, E820_RESERVED);
627 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
633 /* List of systems that have known low memory corruption BIOS problems */
634 static struct dmi_system_id __initdata bad_bios_dmi_table[] = {
635 #ifdef CONFIG_X86_RESERVE_LOW_64K
637 .callback = dmi_low_memory_corruption,
640 DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
644 .callback = dmi_low_memory_corruption,
645 .ident = "Phoenix BIOS",
647 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies"),
655 * Determine if we were loaded by an EFI loader. If so, then we have also been
656 * passed the efi memmap, systab, etc., so we should use these data structures
657 * for initialization. Note, the efi init code path is determined by the
658 * global efi_enabled. This allows the same kernel image to be used on existing
659 * systems (with a traditional BIOS) as well as on EFI systems.
662 * setup_arch - architecture-specific boot-time initializations
664 * Note: On x86_64, fixmaps are ready for use even before this is called.
667 void __init setup_arch(char **cmdline_p)
670 memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
671 visws_early_detect();
672 pre_setup_arch_hook();
674 printk(KERN_INFO "Command line: %s\n", boot_command_line);
677 /* VMI may relocate the fixmap; do this before touching ioremap area */
681 early_ioremap_init();
683 ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
684 screen_info = boot_params.screen_info;
685 edid_info = boot_params.edid_info;
687 apm_info.bios = boot_params.apm_bios_info;
688 ist_info = boot_params.ist_info;
689 if (boot_params.sys_desc_table.length != 0) {
690 set_mca_bus(boot_params.sys_desc_table.table[3] & 0x2);
691 machine_id = boot_params.sys_desc_table.table[0];
692 machine_submodel_id = boot_params.sys_desc_table.table[1];
693 BIOS_revision = boot_params.sys_desc_table.table[2];
696 saved_video_mode = boot_params.hdr.vid_mode;
697 bootloader_type = boot_params.hdr.type_of_loader;
699 #ifdef CONFIG_BLK_DEV_RAM
700 rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
701 rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
702 rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
705 if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
721 /* update the e820_saved too */
722 e820_reserve_setup_data();
726 if (!boot_params.hdr.root_flags)
727 root_mountflags &= ~MS_RDONLY;
728 init_mm.start_code = (unsigned long) _text;
729 init_mm.end_code = (unsigned long) _etext;
730 init_mm.end_data = (unsigned long) _edata;
732 init_mm.brk = init_pg_tables_end + PAGE_OFFSET;
734 init_mm.brk = (unsigned long) &_end;
737 code_resource.start = virt_to_phys(_text);
738 code_resource.end = virt_to_phys(_etext)-1;
739 data_resource.start = virt_to_phys(_etext);
740 data_resource.end = virt_to_phys(_edata)-1;
741 bss_resource.start = virt_to_phys(&__bss_start);
742 bss_resource.end = virt_to_phys(&__bss_stop)-1;
744 #ifdef CONFIG_CMDLINE_BOOL
745 #ifdef CONFIG_CMDLINE_OVERRIDE
746 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
748 if (builtin_cmdline[0]) {
749 /* append boot loader cmdline to builtin */
750 strlcat(builtin_cmdline, " ", COMMAND_LINE_SIZE);
751 strlcat(builtin_cmdline, boot_command_line, COMMAND_LINE_SIZE);
752 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
757 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
758 *cmdline_p = command_line;
766 /* Must be before kernel pagetables are setup */
769 /* after early param, so could get panic from serial */
770 reserve_early_setup_data();
772 if (acpi_mps_check()) {
773 #ifdef CONFIG_X86_LOCAL_APIC
776 setup_clear_cpu_cap(X86_FEATURE_APIC);
780 if (pci_early_dump_regs)
781 early_dump_pci_devices();
784 finish_e820_parsing();
788 dmi_check_system(bad_bios_dmi_table);
791 * VMware detection requires dmi to be available, so this
792 * needs to be done after dmi_scan_machine, for the BP.
794 init_hypervisor(&boot_cpu_data);
800 /* after parse_early_param, so could debug it */
801 insert_resource(&iomem_resource, &code_resource);
802 insert_resource(&iomem_resource, &data_resource);
803 insert_resource(&iomem_resource, &bss_resource);
809 if (ppro_with_ram_bug()) {
810 e820_update_range(0x70000000ULL, 0x40000ULL, E820_RAM,
812 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
813 printk(KERN_INFO "fixed physical RAM map:\n");
814 e820_print_map("bad_ppro");
817 early_gart_iommu_check();
821 * partially used pages are not usable - thus
822 * we are rounding upwards:
824 max_pfn = e820_end_of_ram_pfn();
826 /* preallocate 4k for mptable mpc */
827 early_reserve_e820_mpc_new();
828 /* update e820 for memory not covered by WB MTRRs */
830 if (mtrr_trim_uncached_memory(max_pfn))
831 max_pfn = e820_end_of_ram_pfn();
834 /* max_low_pfn get updated here */
835 find_low_pfn_range();
837 num_physpages = max_pfn;
842 /* How many end-of-memory variables you have, grandma! */
843 /* need this before calling reserve_initrd */
844 if (max_pfn > (1UL<<(32 - PAGE_SHIFT)))
845 max_low_pfn = e820_end_of_low_ram_pfn();
847 max_low_pfn = max_pfn;
849 high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
852 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
853 setup_bios_corruption_check();
856 /* max_pfn_mapped is updated here */
857 max_low_pfn_mapped = init_memory_mapping(0, max_low_pfn<<PAGE_SHIFT);
858 max_pfn_mapped = max_low_pfn_mapped;
861 if (max_pfn > max_low_pfn) {
862 max_pfn_mapped = init_memory_mapping(1UL<<32,
863 max_pfn<<PAGE_SHIFT);
864 /* can we preseve max_low_pfn ?*/
865 max_low_pfn = max_pfn;
870 * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
873 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
874 if (init_ohci1394_dma_early)
875 init_ohci1394_dma_on_all_controllers();
887 * Parse the ACPI tables for possible boot-time SMP configuration.
889 acpi_boot_table_init();
891 early_acpi_boot_init();
893 #ifdef CONFIG_ACPI_NUMA
895 * Parse SRAT to discover nodes.
900 initmem_init(0, max_pfn);
902 #ifdef CONFIG_ACPI_SLEEP
904 * Reserve low memory region for sleep support.
906 acpi_reserve_bootmem();
909 * Find and reserve possible boot-time SMP configuration:
913 reserve_crashkernel();
917 * dma32_reserve_bootmem() allocates bootmem which may conflict
918 * with the crashkernel command line, so do that after
919 * reserve_crashkernel()
921 dma32_reserve_bootmem();
924 reserve_ibft_region();
926 #ifdef CONFIG_KVM_CLOCK
930 paravirt_pagetable_setup_start(swapper_pg_dir);
932 paravirt_pagetable_setup_done(swapper_pg_dir);
933 paravirt_post_allocator_init();
939 generic_apic_probe();
944 * Read APIC and some other early information from ACPI tables.
948 #if defined(CONFIG_X86_MPPARSE) || defined(CONFIG_X86_VISWS)
950 * get boot-time SMP configuration:
952 if (smp_found_config)
956 prefill_possible_map();
962 init_apic_mappings();
963 ioapic_init_mappings();
965 /* need to wait for io_apic is mapped */
970 e820_reserve_resources();
971 e820_mark_nosave_regions(max_low_pfn);
974 request_resource(&iomem_resource, &video_ram_resource);
976 reserve_standard_io_resources();
981 #if defined(CONFIG_VGA_CONSOLE)
982 if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
983 conswitchp = &vga_con;
984 #elif defined(CONFIG_DUMMY_CONSOLE)
985 conswitchp = &dummy_con;