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>
115 RESERVE_BRK(dmi_alloc, 65536);
117 unsigned int boot_cpu_id __read_mostly;
119 static __initdata unsigned long _brk_start = (unsigned long)__brk_base;
120 unsigned long _brk_end = (unsigned long)__brk_base;
123 int default_cpu_present_to_apicid(int mps_cpu)
125 return __default_cpu_present_to_apicid(mps_cpu);
128 int default_check_phys_apicid_present(int boot_cpu_physical_apicid)
130 return __default_check_phys_apicid_present(boot_cpu_physical_apicid);
134 #ifndef CONFIG_DEBUG_BOOT_PARAMS
135 struct boot_params __initdata boot_params;
137 struct boot_params boot_params;
143 static struct resource data_resource = {
144 .name = "Kernel data",
147 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
150 static struct resource code_resource = {
151 .name = "Kernel code",
154 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
157 static struct resource bss_resource = {
158 .name = "Kernel bss",
161 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
166 static struct resource video_ram_resource = {
167 .name = "Video RAM area",
170 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
173 /* cpu data as detected by the assembly code in head.S */
174 struct cpuinfo_x86 new_cpu_data __cpuinitdata = {0, 0, 0, 0, -1, 1, 0, 0, -1};
175 /* common cpu data for all cpus */
176 struct cpuinfo_x86 boot_cpu_data __read_mostly = {0, 0, 0, 0, -1, 1, 0, 0, -1};
177 EXPORT_SYMBOL(boot_cpu_data);
178 static void set_mca_bus(int x)
185 unsigned int def_to_bigsmp;
187 /* for MCA, but anyone else can use it if they want */
188 unsigned int machine_id;
189 unsigned int machine_submodel_id;
190 unsigned int BIOS_revision;
192 struct apm_info apm_info;
193 EXPORT_SYMBOL(apm_info);
195 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
196 defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
197 struct ist_info ist_info;
198 EXPORT_SYMBOL(ist_info);
200 struct ist_info ist_info;
204 struct cpuinfo_x86 boot_cpu_data __read_mostly = {
205 .x86_phys_bits = MAX_PHYSMEM_BITS,
207 EXPORT_SYMBOL(boot_cpu_data);
211 #if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64)
212 unsigned long mmu_cr4_features;
214 unsigned long mmu_cr4_features = X86_CR4_PAE;
217 /* Boot loader ID as an integer, for the benefit of proc_dointvec */
223 struct screen_info screen_info;
224 EXPORT_SYMBOL(screen_info);
225 struct edid_info edid_info;
226 EXPORT_SYMBOL_GPL(edid_info);
228 extern int root_mountflags;
230 unsigned long saved_video_mode;
232 #define RAMDISK_IMAGE_START_MASK 0x07FF
233 #define RAMDISK_PROMPT_FLAG 0x8000
234 #define RAMDISK_LOAD_FLAG 0x4000
236 static char __initdata command_line[COMMAND_LINE_SIZE];
237 #ifdef CONFIG_CMDLINE_BOOL
238 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
241 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
243 #ifdef CONFIG_EDD_MODULE
247 * copy_edd() - Copy the BIOS EDD information
248 * from boot_params into a safe place.
251 static inline void copy_edd(void)
253 memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer,
254 sizeof(edd.mbr_signature));
255 memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
256 edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
257 edd.edd_info_nr = boot_params.eddbuf_entries;
260 static inline void copy_edd(void)
265 void * __init extend_brk(size_t size, size_t align)
267 size_t mask = align - 1;
270 BUG_ON(_brk_start == 0);
271 BUG_ON(align & mask);
273 _brk_end = (_brk_end + mask) & ~mask;
274 BUG_ON((char *)(_brk_end + size) > __brk_limit);
276 ret = (void *)_brk_end;
279 memset(ret, 0, size);
284 static void __init reserve_brk(void)
286 if (_brk_end > _brk_start)
287 reserve_early(__pa(_brk_start), __pa(_brk_end), "BRK");
289 /* Mark brk area as locked down and no longer taking any
294 #ifdef CONFIG_BLK_DEV_INITRD
298 #define MAX_MAP_CHUNK (NR_FIX_BTMAPS << PAGE_SHIFT)
299 static void __init relocate_initrd(void)
302 u64 ramdisk_image = boot_params.hdr.ramdisk_image;
303 u64 ramdisk_size = boot_params.hdr.ramdisk_size;
304 u64 end_of_lowmem = max_low_pfn << PAGE_SHIFT;
306 unsigned long slop, clen, mapaddr;
309 /* We need to move the initrd down into lowmem */
310 ramdisk_here = find_e820_area(0, end_of_lowmem, ramdisk_size,
313 if (ramdisk_here == -1ULL)
314 panic("Cannot find place for new RAMDISK of size %lld\n",
317 /* Note: this includes all the lowmem currently occupied by
318 the initrd, we rely on that fact to keep the data intact. */
319 reserve_early(ramdisk_here, ramdisk_here + ramdisk_size,
321 initrd_start = ramdisk_here + PAGE_OFFSET;
322 initrd_end = initrd_start + ramdisk_size;
323 printk(KERN_INFO "Allocated new RAMDISK: %08llx - %08llx\n",
324 ramdisk_here, ramdisk_here + ramdisk_size);
326 q = (char *)initrd_start;
328 /* Copy any lowmem portion of the initrd */
329 if (ramdisk_image < end_of_lowmem) {
330 clen = end_of_lowmem - ramdisk_image;
331 p = (char *)__va(ramdisk_image);
334 ramdisk_image += clen;
335 ramdisk_size -= clen;
338 /* Copy the highmem portion of the initrd */
339 while (ramdisk_size) {
340 slop = ramdisk_image & ~PAGE_MASK;
342 if (clen > MAX_MAP_CHUNK-slop)
343 clen = MAX_MAP_CHUNK-slop;
344 mapaddr = ramdisk_image & PAGE_MASK;
345 p = early_memremap(mapaddr, clen+slop);
346 memcpy(q, p+slop, clen);
347 early_iounmap(p, clen+slop);
349 ramdisk_image += clen;
350 ramdisk_size -= clen;
352 /* high pages is not converted by early_res_to_bootmem */
353 ramdisk_image = boot_params.hdr.ramdisk_image;
354 ramdisk_size = boot_params.hdr.ramdisk_size;
355 printk(KERN_INFO "Move RAMDISK from %016llx - %016llx to"
356 " %08llx - %08llx\n",
357 ramdisk_image, ramdisk_image + ramdisk_size - 1,
358 ramdisk_here, ramdisk_here + ramdisk_size - 1);
362 static void __init reserve_initrd(void)
364 u64 ramdisk_image = boot_params.hdr.ramdisk_image;
365 u64 ramdisk_size = boot_params.hdr.ramdisk_size;
366 u64 ramdisk_end = ramdisk_image + ramdisk_size;
367 u64 end_of_lowmem = max_low_pfn << PAGE_SHIFT;
369 if (!boot_params.hdr.type_of_loader ||
370 !ramdisk_image || !ramdisk_size)
371 return; /* No initrd provided by bootloader */
375 if (ramdisk_size >= (end_of_lowmem>>1)) {
376 free_early(ramdisk_image, ramdisk_end);
377 printk(KERN_ERR "initrd too large to handle, "
378 "disabling initrd\n");
382 printk(KERN_INFO "RAMDISK: %08llx - %08llx\n", ramdisk_image,
386 if (ramdisk_end <= end_of_lowmem) {
387 /* All in lowmem, easy case */
389 * don't need to reserve again, already reserved early
390 * in i386_start_kernel
392 initrd_start = ramdisk_image + PAGE_OFFSET;
393 initrd_end = initrd_start + ramdisk_size;
400 printk(KERN_ERR "initrd extends beyond end of memory "
401 "(0x%08llx > 0x%08llx)\ndisabling initrd\n",
402 ramdisk_end, end_of_lowmem);
405 free_early(ramdisk_image, ramdisk_end);
408 static void __init reserve_initrd(void)
411 #endif /* CONFIG_BLK_DEV_INITRD */
413 static void __init parse_setup_data(void)
415 struct setup_data *data;
418 if (boot_params.hdr.version < 0x0209)
420 pa_data = boot_params.hdr.setup_data;
422 data = early_memremap(pa_data, PAGE_SIZE);
423 switch (data->type) {
425 parse_e820_ext(data, pa_data);
430 pa_data = data->next;
431 early_iounmap(data, PAGE_SIZE);
435 static void __init e820_reserve_setup_data(void)
437 struct setup_data *data;
441 if (boot_params.hdr.version < 0x0209)
443 pa_data = boot_params.hdr.setup_data;
445 data = early_memremap(pa_data, sizeof(*data));
446 e820_update_range(pa_data, sizeof(*data)+data->len,
447 E820_RAM, E820_RESERVED_KERN);
449 pa_data = data->next;
450 early_iounmap(data, sizeof(*data));
455 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
456 memcpy(&e820_saved, &e820, sizeof(struct e820map));
457 printk(KERN_INFO "extended physical RAM map:\n");
458 e820_print_map("reserve setup_data");
461 static void __init reserve_early_setup_data(void)
463 struct setup_data *data;
467 if (boot_params.hdr.version < 0x0209)
469 pa_data = boot_params.hdr.setup_data;
471 data = early_memremap(pa_data, sizeof(*data));
472 sprintf(buf, "setup data %x", data->type);
473 reserve_early(pa_data, pa_data+sizeof(*data)+data->len, buf);
474 pa_data = data->next;
475 early_iounmap(data, sizeof(*data));
480 * --------- Crashkernel reservation ------------------------------
486 * Reserve @size bytes of crashkernel memory at any suitable offset.
488 * @size: Size of the crashkernel memory to reserve.
489 * Returns the base address on success, and -1ULL on failure.
492 unsigned long long __init find_and_reserve_crashkernel(unsigned long long size)
494 const unsigned long long alignment = 16<<20; /* 16M */
495 unsigned long long start = 0LL;
500 start = find_e820_area(start, ULONG_MAX, size, alignment);
504 /* try to reserve it */
505 ret = reserve_bootmem_generic(start, size, BOOTMEM_EXCLUSIVE);
513 static inline unsigned long long get_total_mem(void)
515 unsigned long long total;
517 total = max_low_pfn - min_low_pfn;
518 #ifdef CONFIG_HIGHMEM
519 total += highend_pfn - highstart_pfn;
522 return total << PAGE_SHIFT;
525 static void __init reserve_crashkernel(void)
527 unsigned long long total_mem;
528 unsigned long long crash_size, crash_base;
531 total_mem = get_total_mem();
533 ret = parse_crashkernel(boot_command_line, total_mem,
534 &crash_size, &crash_base);
535 if (ret != 0 || crash_size <= 0)
538 /* 0 means: find the address automatically */
539 if (crash_base <= 0) {
540 crash_base = find_and_reserve_crashkernel(crash_size);
541 if (crash_base == -1ULL) {
542 pr_info("crashkernel reservation failed. "
543 "No suitable area found.\n");
547 ret = reserve_bootmem_generic(crash_base, crash_size,
550 pr_info("crashkernel reservation failed - "
551 "memory is in use\n");
556 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
557 "for crashkernel (System RAM: %ldMB)\n",
558 (unsigned long)(crash_size >> 20),
559 (unsigned long)(crash_base >> 20),
560 (unsigned long)(total_mem >> 20));
562 crashk_res.start = crash_base;
563 crashk_res.end = crash_base + crash_size - 1;
564 insert_resource(&iomem_resource, &crashk_res);
567 static void __init reserve_crashkernel(void)
572 static struct resource standard_io_resources[] = {
573 { .name = "dma1", .start = 0x00, .end = 0x1f,
574 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
575 { .name = "pic1", .start = 0x20, .end = 0x21,
576 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
577 { .name = "timer0", .start = 0x40, .end = 0x43,
578 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
579 { .name = "timer1", .start = 0x50, .end = 0x53,
580 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
581 { .name = "keyboard", .start = 0x60, .end = 0x60,
582 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
583 { .name = "keyboard", .start = 0x64, .end = 0x64,
584 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
585 { .name = "dma page reg", .start = 0x80, .end = 0x8f,
586 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
587 { .name = "pic2", .start = 0xa0, .end = 0xa1,
588 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
589 { .name = "dma2", .start = 0xc0, .end = 0xdf,
590 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
591 { .name = "fpu", .start = 0xf0, .end = 0xff,
592 .flags = IORESOURCE_BUSY | IORESOURCE_IO }
595 static void __init reserve_standard_io_resources(void)
599 /* request I/O space for devices used on all i[345]86 PCs */
600 for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
601 request_resource(&ioport_resource, &standard_io_resources[i]);
606 * Note: elfcorehdr_addr is not just limited to vmcore. It is also used by
607 * is_kdump_kernel() to determine if we are booting after a panic. Hence
608 * ifdef it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE.
611 #ifdef CONFIG_CRASH_DUMP
612 /* elfcorehdr= specifies the location of elf core header
613 * stored by the crashed kernel. This option will be passed
614 * by kexec loader to the capture kernel.
616 static int __init setup_elfcorehdr(char *arg)
621 elfcorehdr_addr = memparse(arg, &end);
622 return end > arg ? 0 : -EINVAL;
624 early_param("elfcorehdr", setup_elfcorehdr);
627 static struct x86_quirks default_x86_quirks __initdata;
629 struct x86_quirks *x86_quirks __initdata = &default_x86_quirks;
631 #ifdef CONFIG_X86_RESERVE_LOW_64K
632 static int __init dmi_low_memory_corruption(const struct dmi_system_id *d)
635 "%s detected: BIOS may corrupt low RAM, working around it.\n",
638 e820_update_range(0, 0x10000, E820_RAM, E820_RESERVED);
639 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
645 /* List of systems that have known low memory corruption BIOS problems */
646 static struct dmi_system_id __initdata bad_bios_dmi_table[] = {
647 #ifdef CONFIG_X86_RESERVE_LOW_64K
649 .callback = dmi_low_memory_corruption,
652 DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
656 .callback = dmi_low_memory_corruption,
657 .ident = "Phoenix BIOS",
659 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies"),
667 * Determine if we were loaded by an EFI loader. If so, then we have also been
668 * passed the efi memmap, systab, etc., so we should use these data structures
669 * for initialization. Note, the efi init code path is determined by the
670 * global efi_enabled. This allows the same kernel image to be used on existing
671 * systems (with a traditional BIOS) as well as on EFI systems.
674 * setup_arch - architecture-specific boot-time initializations
676 * Note: On x86_64, fixmaps are ready for use even before this is called.
679 void __init setup_arch(char **cmdline_p)
682 memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
683 visws_early_detect();
685 printk(KERN_INFO "Command line: %s\n", boot_command_line);
688 /* VMI may relocate the fixmap; do this before touching ioremap area */
692 early_ioremap_init();
694 ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
695 screen_info = boot_params.screen_info;
696 edid_info = boot_params.edid_info;
698 apm_info.bios = boot_params.apm_bios_info;
699 ist_info = boot_params.ist_info;
700 if (boot_params.sys_desc_table.length != 0) {
701 set_mca_bus(boot_params.sys_desc_table.table[3] & 0x2);
702 machine_id = boot_params.sys_desc_table.table[0];
703 machine_submodel_id = boot_params.sys_desc_table.table[1];
704 BIOS_revision = boot_params.sys_desc_table.table[2];
707 saved_video_mode = boot_params.hdr.vid_mode;
708 bootloader_type = boot_params.hdr.type_of_loader;
710 #ifdef CONFIG_BLK_DEV_RAM
711 rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
712 rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
713 rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
716 if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
732 /* update the e820_saved too */
733 e820_reserve_setup_data();
737 if (!boot_params.hdr.root_flags)
738 root_mountflags &= ~MS_RDONLY;
739 init_mm.start_code = (unsigned long) _text;
740 init_mm.end_code = (unsigned long) _etext;
741 init_mm.end_data = (unsigned long) _edata;
742 init_mm.brk = _brk_end;
744 code_resource.start = virt_to_phys(_text);
745 code_resource.end = virt_to_phys(_etext)-1;
746 data_resource.start = virt_to_phys(_etext);
747 data_resource.end = virt_to_phys(_edata)-1;
748 bss_resource.start = virt_to_phys(&__bss_start);
749 bss_resource.end = virt_to_phys(&__bss_stop)-1;
751 #ifdef CONFIG_CMDLINE_BOOL
752 #ifdef CONFIG_CMDLINE_OVERRIDE
753 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
755 if (builtin_cmdline[0]) {
756 /* append boot loader cmdline to builtin */
757 strlcat(builtin_cmdline, " ", COMMAND_LINE_SIZE);
758 strlcat(builtin_cmdline, boot_command_line, COMMAND_LINE_SIZE);
759 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
764 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
765 *cmdline_p = command_line;
773 /* Must be before kernel pagetables are setup */
776 /* after early param, so could get panic from serial */
777 reserve_early_setup_data();
779 if (acpi_mps_check()) {
780 #ifdef CONFIG_X86_LOCAL_APIC
783 setup_clear_cpu_cap(X86_FEATURE_APIC);
787 if (pci_early_dump_regs)
788 early_dump_pci_devices();
791 finish_e820_parsing();
798 dmi_check_system(bad_bios_dmi_table);
801 * VMware detection requires dmi to be available, so this
802 * needs to be done after dmi_scan_machine, for the BP.
804 init_hypervisor(&boot_cpu_data);
810 /* after parse_early_param, so could debug it */
811 insert_resource(&iomem_resource, &code_resource);
812 insert_resource(&iomem_resource, &data_resource);
813 insert_resource(&iomem_resource, &bss_resource);
817 if (ppro_with_ram_bug()) {
818 e820_update_range(0x70000000ULL, 0x40000ULL, E820_RAM,
820 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
821 printk(KERN_INFO "fixed physical RAM map:\n");
822 e820_print_map("bad_ppro");
825 early_gart_iommu_check();
829 * partially used pages are not usable - thus
830 * we are rounding upwards:
832 max_pfn = e820_end_of_ram_pfn();
834 /* preallocate 4k for mptable mpc */
835 early_reserve_e820_mpc_new();
836 /* update e820 for memory not covered by WB MTRRs */
838 if (mtrr_trim_uncached_memory(max_pfn))
839 max_pfn = e820_end_of_ram_pfn();
842 /* max_low_pfn get updated here */
843 find_low_pfn_range();
845 num_physpages = max_pfn;
849 /* How many end-of-memory variables you have, grandma! */
850 /* need this before calling reserve_initrd */
851 if (max_pfn > (1UL<<(32 - PAGE_SHIFT)))
852 max_low_pfn = e820_end_of_low_ram_pfn();
854 max_low_pfn = max_pfn;
856 high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
859 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
860 setup_bios_corruption_check();
865 /* max_pfn_mapped is updated here */
866 max_low_pfn_mapped = init_memory_mapping(0, max_low_pfn<<PAGE_SHIFT);
867 max_pfn_mapped = max_low_pfn_mapped;
870 if (max_pfn > max_low_pfn) {
871 max_pfn_mapped = init_memory_mapping(1UL<<32,
872 max_pfn<<PAGE_SHIFT);
873 /* can we preseve max_low_pfn ?*/
874 max_low_pfn = max_pfn;
879 * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
882 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
883 if (init_ohci1394_dma_early)
884 init_ohci1394_dma_on_all_controllers();
894 * Parse the ACPI tables for possible boot-time SMP configuration.
896 acpi_boot_table_init();
898 early_acpi_boot_init();
900 #ifdef CONFIG_ACPI_NUMA
902 * Parse SRAT to discover nodes.
907 initmem_init(0, max_pfn);
909 #ifdef CONFIG_ACPI_SLEEP
911 * Reserve low memory region for sleep support.
913 acpi_reserve_bootmem();
916 * Find and reserve possible boot-time SMP configuration:
920 reserve_crashkernel();
924 * dma32_reserve_bootmem() allocates bootmem which may conflict
925 * with the crashkernel command line, so do that after
926 * reserve_crashkernel()
928 dma32_reserve_bootmem();
931 reserve_ibft_region();
933 #ifdef CONFIG_KVM_CLOCK
937 paravirt_pagetable_setup_start(swapper_pg_dir);
939 paravirt_pagetable_setup_done(swapper_pg_dir);
940 paravirt_post_allocator_init();
946 generic_apic_probe();
951 * Read APIC and some other early information from ACPI tables.
955 #if defined(CONFIG_X86_MPPARSE) || defined(CONFIG_X86_VISWS)
957 * get boot-time SMP configuration:
959 if (smp_found_config)
963 prefill_possible_map();
969 init_apic_mappings();
970 ioapic_init_mappings();
972 /* need to wait for io_apic is mapped */
977 e820_reserve_resources();
978 e820_mark_nosave_regions(max_low_pfn);
981 request_resource(&iomem_resource, &video_ram_resource);
983 reserve_standard_io_resources();
988 #if defined(CONFIG_VGA_CONSOLE)
989 if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
990 conswitchp = &vga_con;
991 #elif defined(CONFIG_DUMMY_CONSOLE)
992 conswitchp = &dummy_con;
1000 * x86_quirk_pre_intr_init - initialisation prior to setting up interrupt vectors
1003 * Perform any necessary interrupt initialisation prior to setting up
1004 * the "ordinary" interrupt call gates. For legacy reasons, the ISA
1005 * interrupts should be initialised here if the machine emulates a PC
1008 void __init x86_quirk_pre_intr_init(void)
1010 if (x86_quirks->arch_pre_intr_init) {
1011 if (x86_quirks->arch_pre_intr_init())
1018 * x86_quirk_intr_init - post gate setup interrupt initialisation
1021 * Fill in any interrupts that may have been left out by the general
1022 * init_IRQ() routine. interrupts having to do with the machine rather
1023 * than the devices on the I/O bus (like APIC interrupts in intel MP
1024 * systems) are started here.
1026 void __init x86_quirk_intr_init(void)
1028 if (x86_quirks->arch_intr_init) {
1029 if (x86_quirks->arch_intr_init())
1035 * x86_quirk_trap_init - initialise system specific traps
1038 * Called as the final act of trap_init(). Used in VISWS to initialise
1039 * the various board specific APIC traps.
1041 void __init x86_quirk_trap_init(void)
1043 if (x86_quirks->arch_trap_init) {
1044 if (x86_quirks->arch_trap_init())
1049 static struct irqaction irq0 = {
1050 .handler = timer_interrupt,
1051 .flags = IRQF_DISABLED | IRQF_NOBALANCING | IRQF_IRQPOLL | IRQF_TIMER,
1056 * x86_quirk_pre_time_init - do any specific initialisations before.
1059 void __init x86_quirk_pre_time_init(void)
1061 if (x86_quirks->arch_pre_time_init)
1062 x86_quirks->arch_pre_time_init();
1066 * x86_quirk_time_init - do any specific initialisations for the system timer.
1069 * Must plug the system timer interrupt source at HZ into the IRQ listed
1070 * in irq_vectors.h:TIMER_IRQ
1072 void __init x86_quirk_time_init(void)
1074 if (x86_quirks->arch_time_init) {
1076 * A nonzero return code does not mean failure, it means
1077 * that the architecture quirk does not want any
1078 * generic (timer) setup to be performed after this:
1080 if (x86_quirks->arch_time_init())
1084 irq0.mask = cpumask_of_cpu(0);
1085 setup_irq(0, &irq0);
1087 #endif /* CONFIG_X86_32 */