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/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>
69 #include <linux/tboot.h>
71 #include <video/edid.h>
75 #include <asm/trampoline.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>
86 #include <asm/setup_arch.h>
87 #include <asm/bios_ebda.h>
88 #include <asm/cacheflush.h>
89 #include <asm/processor.h>
92 #include <asm/system.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/numa_64.h>
114 #include <asm/alternative.h>
117 * end_pfn only includes RAM, while max_pfn_mapped includes all e820 entries.
118 * The direct mapping extends to max_pfn_mapped, so that we can directly access
119 * apertures, ACPI and other tables without having to play with fixmaps.
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 #ifndef CONFIG_DEBUG_BOOT_PARAMS
145 struct boot_params __initdata boot_params;
147 struct boot_params boot_params;
153 static struct resource data_resource = {
154 .name = "Kernel data",
157 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
160 static struct resource code_resource = {
161 .name = "Kernel code",
164 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
167 static struct resource bss_resource = {
168 .name = "Kernel bss",
171 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
176 /* cpu data as detected by the assembly code in head.S */
177 struct cpuinfo_x86 new_cpu_data __cpuinitdata = {0, 0, 0, 0, -1, 1, 0, 0, -1};
178 /* common cpu data for all cpus */
179 struct cpuinfo_x86 boot_cpu_data __read_mostly = {0, 0, 0, 0, -1, 1, 0, 0, -1};
180 EXPORT_SYMBOL(boot_cpu_data);
181 static void set_mca_bus(int x)
188 unsigned int def_to_bigsmp;
190 /* for MCA, but anyone else can use it if they want */
191 unsigned int machine_id;
192 unsigned int machine_submodel_id;
193 unsigned int BIOS_revision;
195 struct apm_info apm_info;
196 EXPORT_SYMBOL(apm_info);
198 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
199 defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
200 struct ist_info ist_info;
201 EXPORT_SYMBOL(ist_info);
203 struct ist_info ist_info;
207 struct cpuinfo_x86 boot_cpu_data __read_mostly = {
208 .x86_phys_bits = MAX_PHYSMEM_BITS,
210 EXPORT_SYMBOL(boot_cpu_data);
214 #if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64)
215 unsigned long mmu_cr4_features;
217 unsigned long mmu_cr4_features = X86_CR4_PAE;
220 /* Boot loader ID and version as integers, for the benefit of proc_dointvec */
221 int bootloader_type, bootloader_version;
226 struct screen_info screen_info;
227 EXPORT_SYMBOL(screen_info);
228 struct edid_info edid_info;
229 EXPORT_SYMBOL_GPL(edid_info);
231 extern int root_mountflags;
233 unsigned long saved_video_mode;
235 #define RAMDISK_IMAGE_START_MASK 0x07FF
236 #define RAMDISK_PROMPT_FLAG 0x8000
237 #define RAMDISK_LOAD_FLAG 0x4000
239 static char __initdata command_line[COMMAND_LINE_SIZE];
240 #ifdef CONFIG_CMDLINE_BOOL
241 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
244 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
246 #ifdef CONFIG_EDD_MODULE
250 * copy_edd() - Copy the BIOS EDD information
251 * from boot_params into a safe place.
254 static inline void __init copy_edd(void)
256 memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer,
257 sizeof(edd.mbr_signature));
258 memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
259 edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
260 edd.edd_info_nr = boot_params.eddbuf_entries;
263 static inline void __init copy_edd(void)
268 void * __init extend_brk(size_t size, size_t align)
270 size_t mask = align - 1;
273 BUG_ON(_brk_start == 0);
274 BUG_ON(align & mask);
276 _brk_end = (_brk_end + mask) & ~mask;
277 BUG_ON((char *)(_brk_end + size) > __brk_limit);
279 ret = (void *)_brk_end;
282 memset(ret, 0, size);
288 static void __init init_gbpages(void)
290 if (direct_gbpages && cpu_has_gbpages)
291 printk(KERN_INFO "Using GB pages for direct mapping\n");
296 static inline void init_gbpages(void)
301 static void __init reserve_brk(void)
303 if (_brk_end > _brk_start)
304 reserve_early(__pa(_brk_start), __pa(_brk_end), "BRK");
306 /* Mark brk area as locked down and no longer taking any
311 #ifdef CONFIG_BLK_DEV_INITRD
313 #define MAX_MAP_CHUNK (NR_FIX_BTMAPS << PAGE_SHIFT)
314 static void __init relocate_initrd(void)
316 /* Assume only end is not page aligned */
317 u64 ramdisk_image = boot_params.hdr.ramdisk_image;
318 u64 ramdisk_size = boot_params.hdr.ramdisk_size;
319 u64 area_size = PAGE_ALIGN(ramdisk_size);
320 u64 end_of_lowmem = max_low_pfn_mapped << PAGE_SHIFT;
322 unsigned long slop, clen, mapaddr;
325 /* We need to move the initrd down into lowmem */
326 ramdisk_here = find_e820_area(0, end_of_lowmem, area_size,
329 if (ramdisk_here == -1ULL)
330 panic("Cannot find place for new RAMDISK of size %lld\n",
333 /* Note: this includes all the lowmem currently occupied by
334 the initrd, we rely on that fact to keep the data intact. */
335 reserve_early(ramdisk_here, ramdisk_here + area_size,
337 initrd_start = ramdisk_here + PAGE_OFFSET;
338 initrd_end = initrd_start + ramdisk_size;
339 printk(KERN_INFO "Allocated new RAMDISK: %08llx - %08llx\n",
340 ramdisk_here, ramdisk_here + ramdisk_size);
342 q = (char *)initrd_start;
344 /* Copy any lowmem portion of the initrd */
345 if (ramdisk_image < end_of_lowmem) {
346 clen = end_of_lowmem - ramdisk_image;
347 p = (char *)__va(ramdisk_image);
350 ramdisk_image += clen;
351 ramdisk_size -= clen;
354 /* Copy the highmem portion of the initrd */
355 while (ramdisk_size) {
356 slop = ramdisk_image & ~PAGE_MASK;
358 if (clen > MAX_MAP_CHUNK-slop)
359 clen = MAX_MAP_CHUNK-slop;
360 mapaddr = ramdisk_image & PAGE_MASK;
361 p = early_memremap(mapaddr, clen+slop);
362 memcpy(q, p+slop, clen);
363 early_iounmap(p, clen+slop);
365 ramdisk_image += clen;
366 ramdisk_size -= clen;
368 /* high pages is not converted by early_res_to_bootmem */
369 ramdisk_image = boot_params.hdr.ramdisk_image;
370 ramdisk_size = boot_params.hdr.ramdisk_size;
371 printk(KERN_INFO "Move RAMDISK from %016llx - %016llx to"
372 " %08llx - %08llx\n",
373 ramdisk_image, ramdisk_image + ramdisk_size - 1,
374 ramdisk_here, ramdisk_here + ramdisk_size - 1);
377 static void __init reserve_initrd(void)
379 /* Assume only end is not page aligned */
380 u64 ramdisk_image = boot_params.hdr.ramdisk_image;
381 u64 ramdisk_size = boot_params.hdr.ramdisk_size;
382 u64 ramdisk_end = PAGE_ALIGN(ramdisk_image + ramdisk_size);
383 u64 end_of_lowmem = max_low_pfn_mapped << PAGE_SHIFT;
385 if (!boot_params.hdr.type_of_loader ||
386 !ramdisk_image || !ramdisk_size)
387 return; /* No initrd provided by bootloader */
391 if (ramdisk_size >= (end_of_lowmem>>1)) {
392 free_early(ramdisk_image, ramdisk_end);
393 printk(KERN_ERR "initrd too large to handle, "
394 "disabling initrd\n");
398 printk(KERN_INFO "RAMDISK: %08llx - %08llx\n", ramdisk_image,
402 if (ramdisk_end <= end_of_lowmem) {
403 /* All in lowmem, easy case */
405 * don't need to reserve again, already reserved early
406 * in i386_start_kernel
408 initrd_start = ramdisk_image + PAGE_OFFSET;
409 initrd_end = initrd_start + ramdisk_size;
415 free_early(ramdisk_image, ramdisk_end);
418 static void __init reserve_initrd(void)
421 #endif /* CONFIG_BLK_DEV_INITRD */
423 static void __init parse_setup_data(void)
425 struct setup_data *data;
428 if (boot_params.hdr.version < 0x0209)
430 pa_data = boot_params.hdr.setup_data;
432 data = early_memremap(pa_data, PAGE_SIZE);
433 switch (data->type) {
435 parse_e820_ext(data, pa_data);
440 pa_data = data->next;
441 early_iounmap(data, PAGE_SIZE);
445 static void __init e820_reserve_setup_data(void)
447 struct setup_data *data;
451 if (boot_params.hdr.version < 0x0209)
453 pa_data = boot_params.hdr.setup_data;
455 data = early_memremap(pa_data, sizeof(*data));
456 e820_update_range(pa_data, sizeof(*data)+data->len,
457 E820_RAM, E820_RESERVED_KERN);
459 pa_data = data->next;
460 early_iounmap(data, sizeof(*data));
465 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
466 memcpy(&e820_saved, &e820, sizeof(struct e820map));
467 printk(KERN_INFO "extended physical RAM map:\n");
468 e820_print_map("reserve setup_data");
471 static void __init reserve_early_setup_data(void)
473 struct setup_data *data;
477 if (boot_params.hdr.version < 0x0209)
479 pa_data = boot_params.hdr.setup_data;
481 data = early_memremap(pa_data, sizeof(*data));
482 sprintf(buf, "setup data %x", data->type);
483 reserve_early(pa_data, pa_data+sizeof(*data)+data->len, buf);
484 pa_data = data->next;
485 early_iounmap(data, sizeof(*data));
490 * --------- Crashkernel reservation ------------------------------
495 static inline unsigned long long get_total_mem(void)
497 unsigned long long total;
499 total = max_pfn - min_low_pfn;
501 return total << PAGE_SHIFT;
504 static void __init reserve_crashkernel(void)
506 unsigned long long total_mem;
507 unsigned long long crash_size, crash_base;
510 total_mem = get_total_mem();
512 ret = parse_crashkernel(boot_command_line, total_mem,
513 &crash_size, &crash_base);
514 if (ret != 0 || crash_size <= 0)
517 /* 0 means: find the address automatically */
518 if (crash_base <= 0) {
519 const unsigned long long alignment = 16<<20; /* 16M */
521 crash_base = find_e820_area(alignment, ULONG_MAX, crash_size,
523 if (crash_base == -1ULL) {
524 pr_info("crashkernel reservation failed - No suitable area found.\n");
528 unsigned long long start;
530 start = find_e820_area(crash_base, ULONG_MAX, crash_size,
532 if (start != crash_base) {
533 pr_info("crashkernel reservation failed - memory is in use.\n");
537 reserve_early(crash_base, crash_base + crash_size, "CRASH KERNEL");
539 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
540 "for crashkernel (System RAM: %ldMB)\n",
541 (unsigned long)(crash_size >> 20),
542 (unsigned long)(crash_base >> 20),
543 (unsigned long)(total_mem >> 20));
545 crashk_res.start = crash_base;
546 crashk_res.end = crash_base + crash_size - 1;
547 insert_resource(&iomem_resource, &crashk_res);
550 static void __init reserve_crashkernel(void)
555 static struct resource standard_io_resources[] = {
556 { .name = "dma1", .start = 0x00, .end = 0x1f,
557 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
558 { .name = "pic1", .start = 0x20, .end = 0x21,
559 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
560 { .name = "timer0", .start = 0x40, .end = 0x43,
561 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
562 { .name = "timer1", .start = 0x50, .end = 0x53,
563 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
564 { .name = "keyboard", .start = 0x60, .end = 0x60,
565 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
566 { .name = "keyboard", .start = 0x64, .end = 0x64,
567 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
568 { .name = "dma page reg", .start = 0x80, .end = 0x8f,
569 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
570 { .name = "pic2", .start = 0xa0, .end = 0xa1,
571 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
572 { .name = "dma2", .start = 0xc0, .end = 0xdf,
573 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
574 { .name = "fpu", .start = 0xf0, .end = 0xff,
575 .flags = IORESOURCE_BUSY | IORESOURCE_IO }
578 void __init reserve_standard_io_resources(void)
582 /* request I/O space for devices used on all i[345]86 PCs */
583 for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
584 request_resource(&ioport_resource, &standard_io_resources[i]);
589 * Note: elfcorehdr_addr is not just limited to vmcore. It is also used by
590 * is_kdump_kernel() to determine if we are booting after a panic. Hence
591 * ifdef it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE.
594 #ifdef CONFIG_CRASH_DUMP
595 /* elfcorehdr= specifies the location of elf core header
596 * stored by the crashed kernel. This option will be passed
597 * by kexec loader to the capture kernel.
599 static int __init setup_elfcorehdr(char *arg)
604 elfcorehdr_addr = memparse(arg, &end);
605 return end > arg ? 0 : -EINVAL;
607 early_param("elfcorehdr", setup_elfcorehdr);
610 static __init void reserve_ibft_region(void)
612 unsigned long addr, size = 0;
614 addr = find_ibft_region(&size);
617 reserve_early_overlap_ok(addr, addr + size, "ibft");
620 static unsigned reserve_low = CONFIG_X86_RESERVE_LOW << 10;
622 static void __init trim_bios_range(void)
625 * A special case is the first 4Kb of memory;
626 * This is a BIOS owned area, not kernel ram, but generally
627 * not listed as such in the E820 table.
629 * This typically reserves additional memory (64KiB by default)
630 * since some BIOSes are known to corrupt low memory. See the
631 * Kconfig help text for X86_RESERVE_LOW.
633 e820_update_range(0, ALIGN(reserve_low, PAGE_SIZE),
634 E820_RAM, E820_RESERVED);
637 * special case: Some BIOSen report the PC BIOS
638 * area (640->1Mb) as ram even though it is not.
641 e820_remove_range(BIOS_BEGIN, BIOS_END - BIOS_BEGIN, E820_RAM, 1);
642 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
645 static int __init parse_reservelow(char *p)
647 unsigned long long size;
652 size = memparse(p, &p);
665 early_param("reservelow", parse_reservelow);
668 * Determine if we were loaded by an EFI loader. If so, then we have also been
669 * passed the efi memmap, systab, etc., so we should use these data structures
670 * for initialization. Note, the efi init code path is determined by the
671 * global efi_enabled. This allows the same kernel image to be used on existing
672 * systems (with a traditional BIOS) as well as on EFI systems.
675 * setup_arch - architecture-specific boot-time initializations
677 * Note: On x86_64, fixmaps are ready for use even before this is called.
680 void __init setup_arch(char **cmdline_p)
687 memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
688 visws_early_detect();
690 printk(KERN_INFO "Command line: %s\n", boot_command_line);
694 * If we have OLPC OFW, we might end up relocating the fixmap due to
695 * reserve_top(), so do this before touching the ioremap area.
701 early_ioremap_init();
703 setup_olpc_ofw_pgd();
705 ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
706 screen_info = boot_params.screen_info;
707 edid_info = boot_params.edid_info;
709 apm_info.bios = boot_params.apm_bios_info;
710 ist_info = boot_params.ist_info;
711 if (boot_params.sys_desc_table.length != 0) {
712 set_mca_bus(boot_params.sys_desc_table.table[3] & 0x2);
713 machine_id = boot_params.sys_desc_table.table[0];
714 machine_submodel_id = boot_params.sys_desc_table.table[1];
715 BIOS_revision = boot_params.sys_desc_table.table[2];
718 saved_video_mode = boot_params.hdr.vid_mode;
719 bootloader_type = boot_params.hdr.type_of_loader;
720 if ((bootloader_type >> 4) == 0xe) {
721 bootloader_type &= 0xf;
722 bootloader_type |= (boot_params.hdr.ext_loader_type+0x10) << 4;
724 bootloader_version = bootloader_type & 0xf;
725 bootloader_version |= boot_params.hdr.ext_loader_ver << 4;
727 #ifdef CONFIG_BLK_DEV_RAM
728 rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
729 rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
730 rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
733 if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
745 x86_init.oem.arch_setup();
749 /* update the e820_saved too */
750 e820_reserve_setup_data();
754 if (!boot_params.hdr.root_flags)
755 root_mountflags &= ~MS_RDONLY;
756 init_mm.start_code = (unsigned long) _text;
757 init_mm.end_code = (unsigned long) _etext;
758 init_mm.end_data = (unsigned long) _edata;
759 init_mm.brk = _brk_end;
761 code_resource.start = virt_to_phys(_text);
762 code_resource.end = virt_to_phys(_etext)-1;
763 data_resource.start = virt_to_phys(_etext);
764 data_resource.end = virt_to_phys(_edata)-1;
765 bss_resource.start = virt_to_phys(&__bss_start);
766 bss_resource.end = virt_to_phys(&__bss_stop)-1;
768 #ifdef CONFIG_CMDLINE_BOOL
769 #ifdef CONFIG_CMDLINE_OVERRIDE
770 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
772 if (builtin_cmdline[0]) {
773 /* append boot loader cmdline to builtin */
774 strlcat(builtin_cmdline, " ", COMMAND_LINE_SIZE);
775 strlcat(builtin_cmdline, boot_command_line, COMMAND_LINE_SIZE);
776 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
781 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
782 *cmdline_p = command_line;
785 * x86_configure_nx() is called before parse_early_param() to detect
786 * whether hardware doesn't support NX (so that the early EHCI debug
787 * console setup can safely call set_fixmap()). It may then be called
788 * again from within noexec_setup() during parsing early parameters
789 * to honor the respective command line option.
797 /* after early param, so could get panic from serial */
798 reserve_early_setup_data();
800 if (acpi_mps_check()) {
801 #ifdef CONFIG_X86_LOCAL_APIC
804 setup_clear_cpu_cap(X86_FEATURE_APIC);
808 if (pci_early_dump_regs)
809 early_dump_pci_devices();
812 finish_e820_parsing();
820 * VMware detection requires dmi to be available, so this
821 * needs to be done after dmi_scan_machine, for the BP.
823 init_hypervisor_platform();
825 x86_init.resources.probe_roms();
827 /* after parse_early_param, so could debug it */
828 insert_resource(&iomem_resource, &code_resource);
829 insert_resource(&iomem_resource, &data_resource);
830 insert_resource(&iomem_resource, &bss_resource);
834 if (ppro_with_ram_bug()) {
835 e820_update_range(0x70000000ULL, 0x40000ULL, E820_RAM,
837 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
838 printk(KERN_INFO "fixed physical RAM map:\n");
839 e820_print_map("bad_ppro");
842 early_gart_iommu_check();
846 * partially used pages are not usable - thus
847 * we are rounding upwards:
849 max_pfn = e820_end_of_ram_pfn();
851 /* preallocate 4k for mptable mpc */
852 early_reserve_e820_mpc_new();
853 /* update e820 for memory not covered by WB MTRRs */
855 if (mtrr_trim_uncached_memory(max_pfn))
856 max_pfn = e820_end_of_ram_pfn();
859 /* max_low_pfn get updated here */
860 find_low_pfn_range();
862 num_physpages = max_pfn;
866 /* How many end-of-memory variables you have, grandma! */
867 /* need this before calling reserve_initrd */
868 if (max_pfn > (1UL<<(32 - PAGE_SHIFT)))
869 max_low_pfn = e820_end_of_low_ram_pfn();
871 max_low_pfn = max_pfn;
873 high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
874 max_pfn_mapped = KERNEL_IMAGE_SIZE >> PAGE_SHIFT;
877 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
878 setup_bios_corruption_check();
881 printk(KERN_DEBUG "initial memory mapped : 0 - %08lx\n",
882 max_pfn_mapped<<PAGE_SHIFT);
887 * Find and reserve possible boot-time SMP configuration:
891 reserve_ibft_region();
893 reserve_trampoline_memory();
895 #ifdef CONFIG_ACPI_SLEEP
897 * Reserve low memory region for sleep support.
898 * even before init_memory_mapping
900 acpi_reserve_wakeup_memory();
904 /* max_pfn_mapped is updated here */
905 max_low_pfn_mapped = init_memory_mapping(0, max_low_pfn<<PAGE_SHIFT);
906 max_pfn_mapped = max_low_pfn_mapped;
909 if (max_pfn > max_low_pfn) {
910 max_pfn_mapped = init_memory_mapping(1UL<<32,
911 max_pfn<<PAGE_SHIFT);
912 /* can we preseve max_low_pfn ?*/
913 max_low_pfn = max_pfn;
918 * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
921 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
922 if (init_ohci1394_dma_early)
923 init_ohci1394_dma_on_all_controllers();
928 reserve_crashkernel();
935 * Parse the ACPI tables for possible boot-time SMP configuration.
937 acpi_boot_table_init();
939 early_acpi_boot_init();
941 #ifdef CONFIG_ACPI_NUMA
943 * Parse SRAT to discover nodes.
945 acpi = acpi_numa_init();
948 #ifdef CONFIG_K8_NUMA
950 k8 = !k8_numa_init(0, max_pfn);
953 initmem_init(0, max_pfn, acpi, k8);
954 #ifndef CONFIG_NO_BOOTMEM
955 early_res_to_bootmem(0, max_low_pfn<<PAGE_SHIFT);
958 dma32_reserve_bootmem();
960 #ifdef CONFIG_KVM_CLOCK
964 x86_init.paging.pagetable_setup_start(swapper_pg_dir);
966 x86_init.paging.pagetable_setup_done(swapper_pg_dir);
968 setup_trampoline_page_table();
976 generic_apic_probe();
981 * Read APIC and some other early information from ACPI tables.
988 * get boot-time SMP configuration:
990 if (smp_found_config)
993 prefill_possible_map();
999 init_apic_mappings();
1000 ioapic_init_mappings();
1002 /* need to wait for io_apic is mapped */
1003 probe_nr_irqs_gsi();
1007 e820_reserve_resources();
1008 e820_mark_nosave_regions(max_low_pfn);
1010 x86_init.resources.reserve_resources();
1015 #if defined(CONFIG_VGA_CONSOLE)
1016 if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
1017 conswitchp = &vga_con;
1018 #elif defined(CONFIG_DUMMY_CONSOLE)
1019 conswitchp = &dummy_con;
1022 x86_init.oem.banner();
1026 local_irq_save(flags);
1027 arch_init_ideal_nop5();
1028 local_irq_restore(flags);
1031 #ifdef CONFIG_X86_32
1033 static struct resource video_ram_resource = {
1034 .name = "Video RAM area",
1037 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
1040 void __init i386_reserve_resources(void)
1042 request_resource(&iomem_resource, &video_ram_resource);
1043 reserve_standard_io_resources();
1046 #endif /* CONFIG_X86_32 */