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>
78 #include <asm/timer.h>
79 #include <asm/i8259.h>
80 #include <asm/sections.h>
82 #include <asm/io_apic.h>
85 #include <asm/setup_arch.h>
86 #include <asm/bios_ebda.h>
87 #include <asm/cacheflush.h>
88 #include <asm/processor.h>
91 #include <asm/system.h>
92 #include <asm/vsyscall.h>
96 #include <asm/iommu.h>
98 #include <asm/mmu_context.h>
99 #include <asm/proto.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>
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 boot_cpu_physical_apicid)
138 return __default_check_phys_apicid_present(boot_cpu_physical_apicid);
142 #ifndef CONFIG_DEBUG_BOOT_PARAMS
143 struct boot_params __initdata boot_params;
145 struct boot_params boot_params;
148 #include <asm/tboot.h>
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 static struct resource video_ram_resource = {
177 .name = "Video RAM area",
180 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
183 /* cpu data as detected by the assembly code in head.S */
184 struct cpuinfo_x86 new_cpu_data __cpuinitdata = {0, 0, 0, 0, -1, 1, 0, 0, -1};
185 /* common cpu data for all cpus */
186 struct cpuinfo_x86 boot_cpu_data __read_mostly = {0, 0, 0, 0, -1, 1, 0, 0, -1};
187 EXPORT_SYMBOL(boot_cpu_data);
188 static void set_mca_bus(int x)
195 unsigned int def_to_bigsmp;
197 /* for MCA, but anyone else can use it if they want */
198 unsigned int machine_id;
199 unsigned int machine_submodel_id;
200 unsigned int BIOS_revision;
202 struct apm_info apm_info;
203 EXPORT_SYMBOL(apm_info);
205 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
206 defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
207 struct ist_info ist_info;
208 EXPORT_SYMBOL(ist_info);
210 struct ist_info ist_info;
214 struct cpuinfo_x86 boot_cpu_data __read_mostly = {
215 .x86_phys_bits = MAX_PHYSMEM_BITS,
217 EXPORT_SYMBOL(boot_cpu_data);
221 #if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64)
222 unsigned long mmu_cr4_features;
224 unsigned long mmu_cr4_features = X86_CR4_PAE;
227 /* Boot loader ID and version as integers, for the benefit of proc_dointvec */
228 int bootloader_type, bootloader_version;
233 struct screen_info screen_info;
234 EXPORT_SYMBOL(screen_info);
235 struct edid_info edid_info;
236 EXPORT_SYMBOL_GPL(edid_info);
238 extern int root_mountflags;
240 unsigned long saved_video_mode;
242 #define RAMDISK_IMAGE_START_MASK 0x07FF
243 #define RAMDISK_PROMPT_FLAG 0x8000
244 #define RAMDISK_LOAD_FLAG 0x4000
246 static char __initdata command_line[COMMAND_LINE_SIZE];
247 #ifdef CONFIG_CMDLINE_BOOL
248 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
251 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
253 #ifdef CONFIG_EDD_MODULE
257 * copy_edd() - Copy the BIOS EDD information
258 * from boot_params into a safe place.
261 static inline void copy_edd(void)
263 memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer,
264 sizeof(edd.mbr_signature));
265 memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
266 edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
267 edd.edd_info_nr = boot_params.eddbuf_entries;
270 static inline void copy_edd(void)
275 void * __init extend_brk(size_t size, size_t align)
277 size_t mask = align - 1;
280 BUG_ON(_brk_start == 0);
281 BUG_ON(align & mask);
283 _brk_end = (_brk_end + mask) & ~mask;
284 BUG_ON((char *)(_brk_end + size) > __brk_limit);
286 ret = (void *)_brk_end;
289 memset(ret, 0, size);
295 static void __init init_gbpages(void)
297 if (direct_gbpages && cpu_has_gbpages)
298 printk(KERN_INFO "Using GB pages for direct mapping\n");
303 static inline void init_gbpages(void)
308 static void __init reserve_brk(void)
310 if (_brk_end > _brk_start)
311 reserve_early(__pa(_brk_start), __pa(_brk_end), "BRK");
313 /* Mark brk area as locked down and no longer taking any
318 #ifdef CONFIG_BLK_DEV_INITRD
320 #define MAX_MAP_CHUNK (NR_FIX_BTMAPS << PAGE_SHIFT)
321 static void __init relocate_initrd(void)
324 u64 ramdisk_image = boot_params.hdr.ramdisk_image;
325 u64 ramdisk_size = boot_params.hdr.ramdisk_size;
326 u64 end_of_lowmem = max_low_pfn_mapped << PAGE_SHIFT;
328 unsigned long slop, clen, mapaddr;
331 /* We need to move the initrd down into lowmem */
332 ramdisk_here = find_e820_area(0, end_of_lowmem, ramdisk_size,
335 if (ramdisk_here == -1ULL)
336 panic("Cannot find place for new RAMDISK of size %lld\n",
339 /* Note: this includes all the lowmem currently occupied by
340 the initrd, we rely on that fact to keep the data intact. */
341 reserve_early(ramdisk_here, ramdisk_here + ramdisk_size,
343 initrd_start = ramdisk_here + PAGE_OFFSET;
344 initrd_end = initrd_start + ramdisk_size;
345 printk(KERN_INFO "Allocated new RAMDISK: %08llx - %08llx\n",
346 ramdisk_here, ramdisk_here + ramdisk_size);
348 q = (char *)initrd_start;
350 /* Copy any lowmem portion of the initrd */
351 if (ramdisk_image < end_of_lowmem) {
352 clen = end_of_lowmem - ramdisk_image;
353 p = (char *)__va(ramdisk_image);
356 ramdisk_image += clen;
357 ramdisk_size -= clen;
360 /* Copy the highmem portion of the initrd */
361 while (ramdisk_size) {
362 slop = ramdisk_image & ~PAGE_MASK;
364 if (clen > MAX_MAP_CHUNK-slop)
365 clen = MAX_MAP_CHUNK-slop;
366 mapaddr = ramdisk_image & PAGE_MASK;
367 p = early_memremap(mapaddr, clen+slop);
368 memcpy(q, p+slop, clen);
369 early_iounmap(p, clen+slop);
371 ramdisk_image += clen;
372 ramdisk_size -= clen;
374 /* high pages is not converted by early_res_to_bootmem */
375 ramdisk_image = boot_params.hdr.ramdisk_image;
376 ramdisk_size = boot_params.hdr.ramdisk_size;
377 printk(KERN_INFO "Move RAMDISK from %016llx - %016llx to"
378 " %08llx - %08llx\n",
379 ramdisk_image, ramdisk_image + ramdisk_size - 1,
380 ramdisk_here, ramdisk_here + ramdisk_size - 1);
383 static void __init reserve_initrd(void)
385 u64 ramdisk_image = boot_params.hdr.ramdisk_image;
386 u64 ramdisk_size = boot_params.hdr.ramdisk_size;
387 u64 ramdisk_end = ramdisk_image + ramdisk_size;
388 u64 end_of_lowmem = max_low_pfn_mapped << PAGE_SHIFT;
390 if (!boot_params.hdr.type_of_loader ||
391 !ramdisk_image || !ramdisk_size)
392 return; /* No initrd provided by bootloader */
396 if (ramdisk_size >= (end_of_lowmem>>1)) {
397 free_early(ramdisk_image, ramdisk_end);
398 printk(KERN_ERR "initrd too large to handle, "
399 "disabling initrd\n");
403 printk(KERN_INFO "RAMDISK: %08llx - %08llx\n", ramdisk_image,
407 if (ramdisk_end <= end_of_lowmem) {
408 /* All in lowmem, easy case */
410 * don't need to reserve again, already reserved early
411 * in i386_start_kernel
413 initrd_start = ramdisk_image + PAGE_OFFSET;
414 initrd_end = initrd_start + ramdisk_size;
420 free_early(ramdisk_image, ramdisk_end);
423 static void __init reserve_initrd(void)
426 #endif /* CONFIG_BLK_DEV_INITRD */
428 static void __init parse_setup_data(void)
430 struct setup_data *data;
433 if (boot_params.hdr.version < 0x0209)
435 pa_data = boot_params.hdr.setup_data;
437 data = early_memremap(pa_data, PAGE_SIZE);
438 switch (data->type) {
440 parse_e820_ext(data, pa_data);
445 pa_data = data->next;
446 early_iounmap(data, PAGE_SIZE);
450 static void __init e820_reserve_setup_data(void)
452 struct setup_data *data;
456 if (boot_params.hdr.version < 0x0209)
458 pa_data = boot_params.hdr.setup_data;
460 data = early_memremap(pa_data, sizeof(*data));
461 e820_update_range(pa_data, sizeof(*data)+data->len,
462 E820_RAM, E820_RESERVED_KERN);
464 pa_data = data->next;
465 early_iounmap(data, sizeof(*data));
470 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
471 memcpy(&e820_saved, &e820, sizeof(struct e820map));
472 printk(KERN_INFO "extended physical RAM map:\n");
473 e820_print_map("reserve setup_data");
476 static void __init reserve_early_setup_data(void)
478 struct setup_data *data;
482 if (boot_params.hdr.version < 0x0209)
484 pa_data = boot_params.hdr.setup_data;
486 data = early_memremap(pa_data, sizeof(*data));
487 sprintf(buf, "setup data %x", data->type);
488 reserve_early(pa_data, pa_data+sizeof(*data)+data->len, buf);
489 pa_data = data->next;
490 early_iounmap(data, sizeof(*data));
495 * --------- Crashkernel reservation ------------------------------
501 * Reserve @size bytes of crashkernel memory at any suitable offset.
503 * @size: Size of the crashkernel memory to reserve.
504 * Returns the base address on success, and -1ULL on failure.
507 unsigned long long __init find_and_reserve_crashkernel(unsigned long long size)
509 const unsigned long long alignment = 16<<20; /* 16M */
510 unsigned long long start = 0LL;
515 start = find_e820_area(start, ULONG_MAX, size, alignment);
519 /* try to reserve it */
520 ret = reserve_bootmem_generic(start, size, BOOTMEM_EXCLUSIVE);
528 static inline unsigned long long get_total_mem(void)
530 unsigned long long total;
532 total = max_low_pfn - min_low_pfn;
533 #ifdef CONFIG_HIGHMEM
534 total += highend_pfn - highstart_pfn;
537 return total << PAGE_SHIFT;
540 static void __init reserve_crashkernel(void)
542 unsigned long long total_mem;
543 unsigned long long crash_size, crash_base;
546 total_mem = get_total_mem();
548 ret = parse_crashkernel(boot_command_line, total_mem,
549 &crash_size, &crash_base);
550 if (ret != 0 || crash_size <= 0)
553 /* 0 means: find the address automatically */
554 if (crash_base <= 0) {
555 crash_base = find_and_reserve_crashkernel(crash_size);
556 if (crash_base == -1ULL) {
557 pr_info("crashkernel reservation failed. "
558 "No suitable area found.\n");
562 ret = reserve_bootmem_generic(crash_base, crash_size,
565 pr_info("crashkernel reservation failed - "
566 "memory is in use\n");
571 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
572 "for crashkernel (System RAM: %ldMB)\n",
573 (unsigned long)(crash_size >> 20),
574 (unsigned long)(crash_base >> 20),
575 (unsigned long)(total_mem >> 20));
577 crashk_res.start = crash_base;
578 crashk_res.end = crash_base + crash_size - 1;
579 insert_resource(&iomem_resource, &crashk_res);
582 static void __init reserve_crashkernel(void)
587 static struct resource standard_io_resources[] = {
588 { .name = "dma1", .start = 0x00, .end = 0x1f,
589 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
590 { .name = "pic1", .start = 0x20, .end = 0x21,
591 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
592 { .name = "timer0", .start = 0x40, .end = 0x43,
593 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
594 { .name = "timer1", .start = 0x50, .end = 0x53,
595 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
596 { .name = "keyboard", .start = 0x60, .end = 0x60,
597 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
598 { .name = "keyboard", .start = 0x64, .end = 0x64,
599 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
600 { .name = "dma page reg", .start = 0x80, .end = 0x8f,
601 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
602 { .name = "pic2", .start = 0xa0, .end = 0xa1,
603 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
604 { .name = "dma2", .start = 0xc0, .end = 0xdf,
605 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
606 { .name = "fpu", .start = 0xf0, .end = 0xff,
607 .flags = IORESOURCE_BUSY | IORESOURCE_IO }
610 static void __init reserve_standard_io_resources(void)
614 /* request I/O space for devices used on all i[345]86 PCs */
615 for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
616 request_resource(&ioport_resource, &standard_io_resources[i]);
621 * Note: elfcorehdr_addr is not just limited to vmcore. It is also used by
622 * is_kdump_kernel() to determine if we are booting after a panic. Hence
623 * ifdef it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE.
626 #ifdef CONFIG_CRASH_DUMP
627 /* elfcorehdr= specifies the location of elf core header
628 * stored by the crashed kernel. This option will be passed
629 * by kexec loader to the capture kernel.
631 static int __init setup_elfcorehdr(char *arg)
636 elfcorehdr_addr = memparse(arg, &end);
637 return end > arg ? 0 : -EINVAL;
639 early_param("elfcorehdr", setup_elfcorehdr);
642 static struct x86_quirks default_x86_quirks __initdata;
644 struct x86_quirks *x86_quirks __initdata = &default_x86_quirks;
646 #ifdef CONFIG_X86_RESERVE_LOW_64K
647 static int __init dmi_low_memory_corruption(const struct dmi_system_id *d)
650 "%s detected: BIOS may corrupt low RAM, working around it.\n",
653 e820_update_range(0, 0x10000, E820_RAM, E820_RESERVED);
654 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
660 /* List of systems that have known low memory corruption BIOS problems */
661 static struct dmi_system_id __initdata bad_bios_dmi_table[] = {
662 #ifdef CONFIG_X86_RESERVE_LOW_64K
664 .callback = dmi_low_memory_corruption,
667 DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
671 .callback = dmi_low_memory_corruption,
672 .ident = "Phoenix BIOS",
674 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies"),
682 * Determine if we were loaded by an EFI loader. If so, then we have also been
683 * passed the efi memmap, systab, etc., so we should use these data structures
684 * for initialization. Note, the efi init code path is determined by the
685 * global efi_enabled. This allows the same kernel image to be used on existing
686 * systems (with a traditional BIOS) as well as on EFI systems.
689 * setup_arch - architecture-specific boot-time initializations
691 * Note: On x86_64, fixmaps are ready for use even before this is called.
694 void __init setup_arch(char **cmdline_p)
697 memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
698 visws_early_detect();
700 printk(KERN_INFO "Command line: %s\n", boot_command_line);
703 /* VMI may relocate the fixmap; do this before touching ioremap area */
707 early_ioremap_init();
709 ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
710 screen_info = boot_params.screen_info;
711 edid_info = boot_params.edid_info;
713 apm_info.bios = boot_params.apm_bios_info;
714 ist_info = boot_params.ist_info;
715 if (boot_params.sys_desc_table.length != 0) {
716 set_mca_bus(boot_params.sys_desc_table.table[3] & 0x2);
717 machine_id = boot_params.sys_desc_table.table[0];
718 machine_submodel_id = boot_params.sys_desc_table.table[1];
719 BIOS_revision = boot_params.sys_desc_table.table[2];
722 saved_video_mode = boot_params.hdr.vid_mode;
723 bootloader_type = boot_params.hdr.type_of_loader;
724 if ((bootloader_type >> 4) == 0xe) {
725 bootloader_type &= 0xf;
726 bootloader_type |= (boot_params.hdr.ext_loader_type+0x10) << 4;
728 bootloader_version = bootloader_type & 0xf;
729 bootloader_version |= boot_params.hdr.ext_loader_ver << 4;
731 #ifdef CONFIG_BLK_DEV_RAM
732 rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
733 rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
734 rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
737 if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
753 /* update the e820_saved too */
754 e820_reserve_setup_data();
758 if (!boot_params.hdr.root_flags)
759 root_mountflags &= ~MS_RDONLY;
760 init_mm.start_code = (unsigned long) _text;
761 init_mm.end_code = (unsigned long) _etext;
762 init_mm.end_data = (unsigned long) _edata;
763 init_mm.brk = _brk_end;
765 code_resource.start = virt_to_phys(_text);
766 code_resource.end = virt_to_phys(_etext)-1;
767 data_resource.start = virt_to_phys(_etext);
768 data_resource.end = virt_to_phys(_edata)-1;
769 bss_resource.start = virt_to_phys(&__bss_start);
770 bss_resource.end = virt_to_phys(&__bss_stop)-1;
772 #ifdef CONFIG_CMDLINE_BOOL
773 #ifdef CONFIG_CMDLINE_OVERRIDE
774 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
776 if (builtin_cmdline[0]) {
777 /* append boot loader cmdline to builtin */
778 strlcat(builtin_cmdline, " ", COMMAND_LINE_SIZE);
779 strlcat(builtin_cmdline, boot_command_line, COMMAND_LINE_SIZE);
780 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
785 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
786 *cmdline_p = command_line;
794 /* Must be before kernel pagetables are setup */
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();
819 dmi_check_system(bad_bios_dmi_table);
822 * VMware detection requires dmi to be available, so this
823 * needs to be done after dmi_scan_machine, for the BP.
825 init_hypervisor(&boot_cpu_data);
831 /* after parse_early_param, so could debug it */
832 insert_resource(&iomem_resource, &code_resource);
833 insert_resource(&iomem_resource, &data_resource);
834 insert_resource(&iomem_resource, &bss_resource);
838 if (ppro_with_ram_bug()) {
839 e820_update_range(0x70000000ULL, 0x40000ULL, E820_RAM,
841 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
842 printk(KERN_INFO "fixed physical RAM map:\n");
843 e820_print_map("bad_ppro");
846 early_gart_iommu_check();
850 * partially used pages are not usable - thus
851 * we are rounding upwards:
853 max_pfn = e820_end_of_ram_pfn();
855 /* preallocate 4k for mptable mpc */
856 early_reserve_e820_mpc_new();
857 /* update e820 for memory not covered by WB MTRRs */
859 if (mtrr_trim_uncached_memory(max_pfn))
860 max_pfn = e820_end_of_ram_pfn();
863 /* max_low_pfn get updated here */
864 find_low_pfn_range();
866 num_physpages = max_pfn;
870 /* How many end-of-memory variables you have, grandma! */
871 /* need this before calling reserve_initrd */
872 if (max_pfn > (1UL<<(32 - PAGE_SHIFT)))
873 max_low_pfn = e820_end_of_low_ram_pfn();
875 max_low_pfn = max_pfn;
877 high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
878 max_pfn_mapped = KERNEL_IMAGE_SIZE >> PAGE_SHIFT;
881 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
882 setup_bios_corruption_check();
885 printk(KERN_DEBUG "initial memory mapped : 0 - %08lx\n",
886 max_pfn_mapped<<PAGE_SHIFT);
892 /* max_pfn_mapped is updated here */
893 max_low_pfn_mapped = init_memory_mapping(0, max_low_pfn<<PAGE_SHIFT);
894 max_pfn_mapped = max_low_pfn_mapped;
897 if (max_pfn > max_low_pfn) {
898 max_pfn_mapped = init_memory_mapping(1UL<<32,
899 max_pfn<<PAGE_SHIFT);
900 /* can we preseve max_low_pfn ?*/
901 max_low_pfn = max_pfn;
906 * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
909 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
910 if (init_ohci1394_dma_early)
911 init_ohci1394_dma_on_all_controllers();
921 * Parse the ACPI tables for possible boot-time SMP configuration.
923 acpi_boot_table_init();
925 early_acpi_boot_init();
927 #ifdef CONFIG_ACPI_NUMA
929 * Parse SRAT to discover nodes.
934 initmem_init(0, max_pfn);
936 #ifdef CONFIG_ACPI_SLEEP
938 * Reserve low memory region for sleep support.
940 acpi_reserve_bootmem();
943 * Find and reserve possible boot-time SMP configuration:
947 reserve_crashkernel();
951 * dma32_reserve_bootmem() allocates bootmem which may conflict
952 * with the crashkernel command line, so do that after
953 * reserve_crashkernel()
955 dma32_reserve_bootmem();
958 reserve_ibft_region();
960 #ifdef CONFIG_KVM_CLOCK
964 paravirt_pagetable_setup_start(swapper_pg_dir);
966 paravirt_pagetable_setup_done(swapper_pg_dir);
967 paravirt_post_allocator_init();
975 generic_apic_probe();
980 * Read APIC and some other early information from ACPI tables.
984 #if defined(CONFIG_X86_MPPARSE) || defined(CONFIG_X86_VISWS)
986 * get boot-time SMP configuration:
988 if (smp_found_config)
992 prefill_possible_map();
998 init_apic_mappings();
999 ioapic_init_mappings();
1001 /* need to wait for io_apic is mapped */
1002 probe_nr_irqs_gsi();
1006 e820_reserve_resources();
1007 e820_mark_nosave_regions(max_low_pfn);
1009 #ifdef CONFIG_X86_32
1010 request_resource(&iomem_resource, &video_ram_resource);
1012 reserve_standard_io_resources();
1017 #if defined(CONFIG_VGA_CONSOLE)
1018 if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
1019 conswitchp = &vga_con;
1020 #elif defined(CONFIG_DUMMY_CONSOLE)
1021 conswitchp = &dummy_con;
1026 #ifdef CONFIG_X86_32
1029 * x86_quirk_intr_init - post gate setup interrupt initialisation
1032 * Fill in any interrupts that may have been left out by the general
1033 * init_IRQ() routine. interrupts having to do with the machine rather
1034 * than the devices on the I/O bus (like APIC interrupts in intel MP
1035 * systems) are started here.
1037 void __init x86_quirk_intr_init(void)
1039 if (x86_quirks->arch_intr_init) {
1040 if (x86_quirks->arch_intr_init())
1046 * x86_quirk_trap_init - initialise system specific traps
1049 * Called as the final act of trap_init(). Used in VISWS to initialise
1050 * the various board specific APIC traps.
1052 void __init x86_quirk_trap_init(void)
1054 if (x86_quirks->arch_trap_init) {
1055 if (x86_quirks->arch_trap_init())
1060 static struct irqaction irq0 = {
1061 .handler = timer_interrupt,
1062 .flags = IRQF_DISABLED | IRQF_NOBALANCING | IRQF_IRQPOLL | IRQF_TIMER,
1067 * x86_quirk_pre_time_init - do any specific initialisations before.
1070 void __init x86_quirk_pre_time_init(void)
1072 if (x86_quirks->arch_pre_time_init)
1073 x86_quirks->arch_pre_time_init();
1077 * x86_quirk_time_init - do any specific initialisations for the system timer.
1080 * Must plug the system timer interrupt source at HZ into the IRQ listed
1081 * in irq_vectors.h:TIMER_IRQ
1083 void __init x86_quirk_time_init(void)
1085 if (x86_quirks->arch_time_init) {
1087 * A nonzero return code does not mean failure, it means
1088 * that the architecture quirk does not want any
1089 * generic (timer) setup to be performed after this:
1091 if (x86_quirks->arch_time_init())
1095 irq0.mask = cpumask_of_cpu(0);
1096 setup_irq(0, &irq0);
1098 #endif /* CONFIG_X86_32 */