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/sfi.h>
31 #include <linux/apm_bios.h>
32 #include <linux/initrd.h>
33 #include <linux/bootmem.h>
34 #include <linux/seq_file.h>
35 #include <linux/console.h>
36 #include <linux/mca.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>
53 #include <linux/errno.h>
54 #include <linux/kernel.h>
55 #include <linux/stddef.h>
56 #include <linux/unistd.h>
57 #include <linux/ptrace.h>
58 #include <linux/slab.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>
72 #include <video/edid.h>
77 #include <asm/mpspec.h>
78 #include <asm/setup.h>
80 #include <asm/timer.h>
81 #include <asm/i8259.h>
82 #include <asm/sections.h>
84 #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/system.h>
94 #include <asm/vsyscall.h>
98 #include <asm/iommu.h>
100 #include <asm/mmu_context.h>
101 #include <asm/proto.h>
103 #include <asm/paravirt.h>
104 #include <asm/hypervisor.h>
106 #include <asm/percpu.h>
107 #include <asm/topology.h>
108 #include <asm/apicdef.h>
111 #include <asm/numa_64.h>
116 * end_pfn only includes RAM, while max_pfn_mapped includes all e820 entries.
117 * The direct mapping extends to max_pfn_mapped, so that we can directly access
118 * apertures, ACPI and other tables without having to play with fixmaps.
120 unsigned long max_low_pfn_mapped;
121 unsigned long max_pfn_mapped;
123 RESERVE_BRK(dmi_alloc, 65536);
125 unsigned int boot_cpu_id __read_mostly;
127 static __initdata unsigned long _brk_start = (unsigned long)__brk_base;
128 unsigned long _brk_end = (unsigned long)__brk_base;
131 int default_cpu_present_to_apicid(int mps_cpu)
133 return __default_cpu_present_to_apicid(mps_cpu);
136 int default_check_phys_apicid_present(int phys_apicid)
138 return __default_check_phys_apicid_present(phys_apicid);
142 #ifndef CONFIG_DEBUG_BOOT_PARAMS
143 struct boot_params __initdata boot_params;
145 struct boot_params boot_params;
151 static struct resource data_resource = {
152 .name = "Kernel data",
155 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
158 static struct resource code_resource = {
159 .name = "Kernel code",
162 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
165 static struct resource bss_resource = {
166 .name = "Kernel bss",
169 .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 .x86_phys_bits = MAX_PHYSMEM_BITS,
208 EXPORT_SYMBOL(boot_cpu_data);
212 #if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64)
213 unsigned long mmu_cr4_features;
215 unsigned long mmu_cr4_features = X86_CR4_PAE;
218 /* Boot loader ID and version as integers, for the benefit of proc_dointvec */
219 int bootloader_type, bootloader_version;
224 struct screen_info screen_info;
225 EXPORT_SYMBOL(screen_info);
226 struct edid_info edid_info;
227 EXPORT_SYMBOL_GPL(edid_info);
229 extern int root_mountflags;
231 unsigned long saved_video_mode;
233 #define RAMDISK_IMAGE_START_MASK 0x07FF
234 #define RAMDISK_PROMPT_FLAG 0x8000
235 #define RAMDISK_LOAD_FLAG 0x4000
237 static char __initdata command_line[COMMAND_LINE_SIZE];
238 #ifdef CONFIG_CMDLINE_BOOL
239 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
242 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
244 #ifdef CONFIG_EDD_MODULE
248 * copy_edd() - Copy the BIOS EDD information
249 * from boot_params into a safe place.
252 static inline void __init copy_edd(void)
254 memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer,
255 sizeof(edd.mbr_signature));
256 memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
257 edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
258 edd.edd_info_nr = boot_params.eddbuf_entries;
261 static inline void __init copy_edd(void)
266 void * __init extend_brk(size_t size, size_t align)
268 size_t mask = align - 1;
271 BUG_ON(_brk_start == 0);
272 BUG_ON(align & mask);
274 _brk_end = (_brk_end + mask) & ~mask;
275 BUG_ON((char *)(_brk_end + size) > __brk_limit);
277 ret = (void *)_brk_end;
280 memset(ret, 0, size);
286 static void __init init_gbpages(void)
288 if (direct_gbpages && cpu_has_gbpages)
289 printk(KERN_INFO "Using GB pages for direct mapping\n");
294 static inline void init_gbpages(void)
299 static void __init reserve_brk(void)
301 if (_brk_end > _brk_start)
302 reserve_early(__pa(_brk_start), __pa(_brk_end), "BRK");
304 /* Mark brk area as locked down and no longer taking any
309 #ifdef CONFIG_BLK_DEV_INITRD
311 #define MAX_MAP_CHUNK (NR_FIX_BTMAPS << PAGE_SHIFT)
312 static void __init relocate_initrd(void)
315 u64 ramdisk_image = boot_params.hdr.ramdisk_image;
316 u64 ramdisk_size = boot_params.hdr.ramdisk_size;
317 u64 end_of_lowmem = max_low_pfn_mapped << PAGE_SHIFT;
319 unsigned long slop, clen, mapaddr;
322 /* We need to move the initrd down into lowmem */
323 ramdisk_here = find_e820_area(0, end_of_lowmem, ramdisk_size,
326 if (ramdisk_here == -1ULL)
327 panic("Cannot find place for new RAMDISK of size %lld\n",
330 /* Note: this includes all the lowmem currently occupied by
331 the initrd, we rely on that fact to keep the data intact. */
332 reserve_early(ramdisk_here, ramdisk_here + ramdisk_size,
334 initrd_start = ramdisk_here + PAGE_OFFSET;
335 initrd_end = initrd_start + ramdisk_size;
336 printk(KERN_INFO "Allocated new RAMDISK: %08llx - %08llx\n",
337 ramdisk_here, ramdisk_here + ramdisk_size);
339 q = (char *)initrd_start;
341 /* Copy any lowmem portion of the initrd */
342 if (ramdisk_image < end_of_lowmem) {
343 clen = end_of_lowmem - ramdisk_image;
344 p = (char *)__va(ramdisk_image);
347 ramdisk_image += clen;
348 ramdisk_size -= clen;
351 /* Copy the highmem portion of the initrd */
352 while (ramdisk_size) {
353 slop = ramdisk_image & ~PAGE_MASK;
355 if (clen > MAX_MAP_CHUNK-slop)
356 clen = MAX_MAP_CHUNK-slop;
357 mapaddr = ramdisk_image & PAGE_MASK;
358 p = early_memremap(mapaddr, clen+slop);
359 memcpy(q, p+slop, clen);
360 early_iounmap(p, clen+slop);
362 ramdisk_image += clen;
363 ramdisk_size -= clen;
365 /* high pages is not converted by early_res_to_bootmem */
366 ramdisk_image = boot_params.hdr.ramdisk_image;
367 ramdisk_size = boot_params.hdr.ramdisk_size;
368 printk(KERN_INFO "Move RAMDISK from %016llx - %016llx to"
369 " %08llx - %08llx\n",
370 ramdisk_image, ramdisk_image + ramdisk_size - 1,
371 ramdisk_here, ramdisk_here + ramdisk_size - 1);
374 static void __init reserve_initrd(void)
376 u64 ramdisk_image = boot_params.hdr.ramdisk_image;
377 u64 ramdisk_size = boot_params.hdr.ramdisk_size;
378 u64 ramdisk_end = ramdisk_image + ramdisk_size;
379 u64 end_of_lowmem = max_low_pfn_mapped << PAGE_SHIFT;
381 if (!boot_params.hdr.type_of_loader ||
382 !ramdisk_image || !ramdisk_size)
383 return; /* No initrd provided by bootloader */
387 if (ramdisk_size >= (end_of_lowmem>>1)) {
388 free_early(ramdisk_image, ramdisk_end);
389 printk(KERN_ERR "initrd too large to handle, "
390 "disabling initrd\n");
394 printk(KERN_INFO "RAMDISK: %08llx - %08llx\n", ramdisk_image,
398 if (ramdisk_end <= end_of_lowmem) {
399 /* All in lowmem, easy case */
401 * don't need to reserve again, already reserved early
402 * in i386_start_kernel
404 initrd_start = ramdisk_image + PAGE_OFFSET;
405 initrd_end = initrd_start + ramdisk_size;
411 free_early(ramdisk_image, ramdisk_end);
414 static void __init reserve_initrd(void)
417 #endif /* CONFIG_BLK_DEV_INITRD */
419 static void __init parse_setup_data(void)
421 struct setup_data *data;
424 if (boot_params.hdr.version < 0x0209)
426 pa_data = boot_params.hdr.setup_data;
428 data = early_memremap(pa_data, PAGE_SIZE);
429 switch (data->type) {
431 parse_e820_ext(data, pa_data);
436 pa_data = data->next;
437 early_iounmap(data, PAGE_SIZE);
441 static void __init e820_reserve_setup_data(void)
443 struct setup_data *data;
447 if (boot_params.hdr.version < 0x0209)
449 pa_data = boot_params.hdr.setup_data;
451 data = early_memremap(pa_data, sizeof(*data));
452 e820_update_range(pa_data, sizeof(*data)+data->len,
453 E820_RAM, E820_RESERVED_KERN);
455 pa_data = data->next;
456 early_iounmap(data, sizeof(*data));
461 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
462 memcpy(&e820_saved, &e820, sizeof(struct e820map));
463 printk(KERN_INFO "extended physical RAM map:\n");
464 e820_print_map("reserve setup_data");
467 static void __init reserve_early_setup_data(void)
469 struct setup_data *data;
473 if (boot_params.hdr.version < 0x0209)
475 pa_data = boot_params.hdr.setup_data;
477 data = early_memremap(pa_data, sizeof(*data));
478 sprintf(buf, "setup data %x", data->type);
479 reserve_early(pa_data, pa_data+sizeof(*data)+data->len, buf);
480 pa_data = data->next;
481 early_iounmap(data, sizeof(*data));
486 * --------- Crashkernel reservation ------------------------------
491 static inline unsigned long long get_total_mem(void)
493 unsigned long long total;
495 total = max_pfn - min_low_pfn;
497 return total << PAGE_SHIFT;
500 static void __init reserve_crashkernel(void)
502 unsigned long long total_mem;
503 unsigned long long crash_size, crash_base;
506 total_mem = get_total_mem();
508 ret = parse_crashkernel(boot_command_line, total_mem,
509 &crash_size, &crash_base);
510 if (ret != 0 || crash_size <= 0)
513 /* 0 means: find the address automatically */
514 if (crash_base <= 0) {
515 const unsigned long long alignment = 16<<20; /* 16M */
517 crash_base = find_e820_area(alignment, ULONG_MAX, crash_size,
519 if (crash_base == -1ULL) {
520 pr_info("crashkernel reservation failed - No suitable area found.\n");
524 unsigned long long start;
526 start = find_e820_area(crash_base, ULONG_MAX, crash_size,
528 if (start != crash_base) {
529 pr_info("crashkernel reservation failed - memory is in use.\n");
533 reserve_early(crash_base, crash_base + crash_size, "CRASH KERNEL");
535 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
536 "for crashkernel (System RAM: %ldMB)\n",
537 (unsigned long)(crash_size >> 20),
538 (unsigned long)(crash_base >> 20),
539 (unsigned long)(total_mem >> 20));
541 crashk_res.start = crash_base;
542 crashk_res.end = crash_base + crash_size - 1;
543 insert_resource(&iomem_resource, &crashk_res);
546 static void __init reserve_crashkernel(void)
551 static struct resource standard_io_resources[] = {
552 { .name = "dma1", .start = 0x00, .end = 0x1f,
553 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
554 { .name = "pic1", .start = 0x20, .end = 0x21,
555 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
556 { .name = "timer0", .start = 0x40, .end = 0x43,
557 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
558 { .name = "timer1", .start = 0x50, .end = 0x53,
559 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
560 { .name = "keyboard", .start = 0x60, .end = 0x60,
561 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
562 { .name = "keyboard", .start = 0x64, .end = 0x64,
563 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
564 { .name = "dma page reg", .start = 0x80, .end = 0x8f,
565 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
566 { .name = "pic2", .start = 0xa0, .end = 0xa1,
567 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
568 { .name = "dma2", .start = 0xc0, .end = 0xdf,
569 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
570 { .name = "fpu", .start = 0xf0, .end = 0xff,
571 .flags = IORESOURCE_BUSY | IORESOURCE_IO }
574 void __init reserve_standard_io_resources(void)
578 /* request I/O space for devices used on all i[345]86 PCs */
579 for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
580 request_resource(&ioport_resource, &standard_io_resources[i]);
585 * Note: elfcorehdr_addr is not just limited to vmcore. It is also used by
586 * is_kdump_kernel() to determine if we are booting after a panic. Hence
587 * ifdef it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE.
590 #ifdef CONFIG_CRASH_DUMP
591 /* elfcorehdr= specifies the location of elf core header
592 * stored by the crashed kernel. This option will be passed
593 * by kexec loader to the capture kernel.
595 static int __init setup_elfcorehdr(char *arg)
600 elfcorehdr_addr = memparse(arg, &end);
601 return end > arg ? 0 : -EINVAL;
603 early_param("elfcorehdr", setup_elfcorehdr);
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 around it.\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"),
638 .callback = dmi_low_memory_corruption,
639 .ident = "Phoenix/MSC BIOS",
641 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix/MSC"),
646 * AMI BIOS with low memory corruption was found on Intel DG45ID board.
647 * It hase different DMI_BIOS_VENDOR = "Intel Corp.", for now we will
648 * match only DMI_BOARD_NAME and see if there is more bad products
651 .callback = dmi_low_memory_corruption,
654 DMI_MATCH(DMI_BOARD_NAME, "DG45ID"),
662 * Determine if we were loaded by an EFI loader. If so, then we have also been
663 * passed the efi memmap, systab, etc., so we should use these data structures
664 * for initialization. Note, the efi init code path is determined by the
665 * global efi_enabled. This allows the same kernel image to be used on existing
666 * systems (with a traditional BIOS) as well as on EFI systems.
669 * setup_arch - architecture-specific boot-time initializations
671 * Note: On x86_64, fixmaps are ready for use even before this is called.
674 void __init setup_arch(char **cmdline_p)
680 memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
681 visws_early_detect();
683 printk(KERN_INFO "Command line: %s\n", boot_command_line);
686 /* VMI may relocate the fixmap; do this before touching ioremap area */
690 early_ioremap_init();
692 ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
693 screen_info = boot_params.screen_info;
694 edid_info = boot_params.edid_info;
696 apm_info.bios = boot_params.apm_bios_info;
697 ist_info = boot_params.ist_info;
698 if (boot_params.sys_desc_table.length != 0) {
699 set_mca_bus(boot_params.sys_desc_table.table[3] & 0x2);
700 machine_id = boot_params.sys_desc_table.table[0];
701 machine_submodel_id = boot_params.sys_desc_table.table[1];
702 BIOS_revision = boot_params.sys_desc_table.table[2];
705 saved_video_mode = boot_params.hdr.vid_mode;
706 bootloader_type = boot_params.hdr.type_of_loader;
707 if ((bootloader_type >> 4) == 0xe) {
708 bootloader_type &= 0xf;
709 bootloader_type |= (boot_params.hdr.ext_loader_type+0x10) << 4;
711 bootloader_version = bootloader_type & 0xf;
712 bootloader_version |= boot_params.hdr.ext_loader_ver << 4;
714 #ifdef CONFIG_BLK_DEV_RAM
715 rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
716 rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
717 rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
720 if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
732 x86_init.oem.arch_setup();
736 /* update the e820_saved too */
737 e820_reserve_setup_data();
741 if (!boot_params.hdr.root_flags)
742 root_mountflags &= ~MS_RDONLY;
743 init_mm.start_code = (unsigned long) _text;
744 init_mm.end_code = (unsigned long) _etext;
745 init_mm.end_data = (unsigned long) _edata;
746 init_mm.brk = _brk_end;
748 code_resource.start = virt_to_phys(_text);
749 code_resource.end = virt_to_phys(_etext)-1;
750 data_resource.start = virt_to_phys(_etext);
751 data_resource.end = virt_to_phys(_edata)-1;
752 bss_resource.start = virt_to_phys(&__bss_start);
753 bss_resource.end = virt_to_phys(&__bss_stop)-1;
755 #ifdef CONFIG_CMDLINE_BOOL
756 #ifdef CONFIG_CMDLINE_OVERRIDE
757 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
759 if (builtin_cmdline[0]) {
760 /* append boot loader cmdline to builtin */
761 strlcat(builtin_cmdline, " ", COMMAND_LINE_SIZE);
762 strlcat(builtin_cmdline, boot_command_line, COMMAND_LINE_SIZE);
763 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
768 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
769 *cmdline_p = command_line;
772 * x86_configure_nx() is called before parse_early_param() to detect
773 * whether hardware doesn't support NX (so that the early EHCI debug
774 * console setup can safely call set_fixmap()). It may then be called
775 * again from within noexec_setup() during parsing early parameters
776 * to honor the respective command line option.
784 /* Must be before kernel pagetables are setup */
787 /* after early param, so could get panic from serial */
788 reserve_early_setup_data();
790 if (acpi_mps_check()) {
791 #ifdef CONFIG_X86_LOCAL_APIC
794 setup_clear_cpu_cap(X86_FEATURE_APIC);
798 if (pci_early_dump_regs)
799 early_dump_pci_devices();
802 finish_e820_parsing();
809 dmi_check_system(bad_bios_dmi_table);
812 * VMware detection requires dmi to be available, so this
813 * needs to be done after dmi_scan_machine, for the BP.
815 init_hypervisor_platform();
817 x86_init.resources.probe_roms();
819 /* after parse_early_param, so could debug it */
820 insert_resource(&iomem_resource, &code_resource);
821 insert_resource(&iomem_resource, &data_resource);
822 insert_resource(&iomem_resource, &bss_resource);
826 if (ppro_with_ram_bug()) {
827 e820_update_range(0x70000000ULL, 0x40000ULL, E820_RAM,
829 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
830 printk(KERN_INFO "fixed physical RAM map:\n");
831 e820_print_map("bad_ppro");
834 early_gart_iommu_check();
838 * partially used pages are not usable - thus
839 * we are rounding upwards:
841 max_pfn = e820_end_of_ram_pfn();
843 /* preallocate 4k for mptable mpc */
844 early_reserve_e820_mpc_new();
845 /* update e820 for memory not covered by WB MTRRs */
847 if (mtrr_trim_uncached_memory(max_pfn))
848 max_pfn = e820_end_of_ram_pfn();
851 /* max_low_pfn get updated here */
852 find_low_pfn_range();
854 num_physpages = max_pfn;
858 /* How many end-of-memory variables you have, grandma! */
859 /* need this before calling reserve_initrd */
860 if (max_pfn > (1UL<<(32 - PAGE_SHIFT)))
861 max_low_pfn = e820_end_of_low_ram_pfn();
863 max_low_pfn = max_pfn;
865 high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
866 max_pfn_mapped = KERNEL_IMAGE_SIZE >> PAGE_SHIFT;
869 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
870 setup_bios_corruption_check();
873 printk(KERN_DEBUG "initial memory mapped : 0 - %08lx\n",
874 max_pfn_mapped<<PAGE_SHIFT);
878 #ifdef CONFIG_ACPI_SLEEP
880 * Reserve low memory region for sleep support.
881 * even before init_memory_mapping
883 acpi_reserve_wakeup_memory();
887 /* max_pfn_mapped is updated here */
888 max_low_pfn_mapped = init_memory_mapping(0, max_low_pfn<<PAGE_SHIFT);
889 max_pfn_mapped = max_low_pfn_mapped;
892 if (max_pfn > max_low_pfn) {
893 max_pfn_mapped = init_memory_mapping(1UL<<32,
894 max_pfn<<PAGE_SHIFT);
895 /* can we preseve max_low_pfn ?*/
896 max_low_pfn = max_pfn;
901 * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
904 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
905 if (init_ohci1394_dma_early)
906 init_ohci1394_dma_on_all_controllers();
911 reserve_crashkernel();
918 * Parse the ACPI tables for possible boot-time SMP configuration.
920 acpi_boot_table_init();
922 early_acpi_boot_init();
925 * Find and reserve possible boot-time SMP configuration:
929 #ifdef CONFIG_ACPI_NUMA
931 * Parse SRAT to discover nodes.
933 acpi = acpi_numa_init();
936 #ifdef CONFIG_K8_NUMA
938 k8 = !k8_numa_init(0, max_pfn);
941 initmem_init(0, max_pfn, acpi, k8);
945 * dma32_reserve_bootmem() allocates bootmem which may conflict
946 * with the crashkernel command line, so do that after
947 * reserve_crashkernel()
949 dma32_reserve_bootmem();
952 reserve_ibft_region();
954 #ifdef CONFIG_KVM_CLOCK
958 x86_init.paging.pagetable_setup_start(swapper_pg_dir);
960 x86_init.paging.pagetable_setup_done(swapper_pg_dir);
968 generic_apic_probe();
973 * Read APIC and some other early information from ACPI tables.
980 * get boot-time SMP configuration:
982 if (smp_found_config)
985 prefill_possible_map();
991 init_apic_mappings();
992 ioapic_init_mappings();
994 /* need to wait for io_apic is mapped */
999 e820_reserve_resources();
1000 e820_mark_nosave_regions(max_low_pfn);
1002 x86_init.resources.reserve_resources();
1007 #if defined(CONFIG_VGA_CONSOLE)
1008 if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
1009 conswitchp = &vga_con;
1010 #elif defined(CONFIG_DUMMY_CONSOLE)
1011 conswitchp = &dummy_con;
1014 x86_init.oem.banner();
1019 #ifdef CONFIG_X86_32
1021 static struct resource video_ram_resource = {
1022 .name = "Video RAM area",
1025 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
1028 void __init i386_reserve_resources(void)
1030 request_resource(&iomem_resource, &video_ram_resource);
1031 reserve_standard_io_resources();
1034 #endif /* CONFIG_X86_32 */