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/memblock.h>
35 #include <linux/seq_file.h>
36 #include <linux/console.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/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>
103 #include <asm/olpc_ofw.h>
105 #include <asm/percpu.h>
106 #include <asm/topology.h>
107 #include <asm/apicdef.h>
108 #include <asm/amd_nb.h>
110 #include <asm/numa_64.h>
113 #include <asm/alternative.h>
114 #include <asm/prom.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);
182 unsigned int def_to_bigsmp;
184 /* for MCA, but anyone else can use it if they want */
185 unsigned int machine_id;
186 unsigned int machine_submodel_id;
187 unsigned int BIOS_revision;
189 struct apm_info apm_info;
190 EXPORT_SYMBOL(apm_info);
192 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
193 defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
194 struct ist_info ist_info;
195 EXPORT_SYMBOL(ist_info);
197 struct ist_info ist_info;
201 struct cpuinfo_x86 boot_cpu_data __read_mostly = {
202 .x86_phys_bits = MAX_PHYSMEM_BITS,
204 EXPORT_SYMBOL(boot_cpu_data);
208 #if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64)
209 unsigned long mmu_cr4_features;
211 unsigned long mmu_cr4_features = X86_CR4_PAE;
214 /* Boot loader ID and version as integers, for the benefit of proc_dointvec */
215 int bootloader_type, bootloader_version;
220 struct screen_info screen_info;
221 EXPORT_SYMBOL(screen_info);
222 struct edid_info edid_info;
223 EXPORT_SYMBOL_GPL(edid_info);
225 extern int root_mountflags;
227 unsigned long saved_video_mode;
229 #define RAMDISK_IMAGE_START_MASK 0x07FF
230 #define RAMDISK_PROMPT_FLAG 0x8000
231 #define RAMDISK_LOAD_FLAG 0x4000
233 static char __initdata command_line[COMMAND_LINE_SIZE];
234 #ifdef CONFIG_CMDLINE_BOOL
235 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
238 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
240 #ifdef CONFIG_EDD_MODULE
244 * copy_edd() - Copy the BIOS EDD information
245 * from boot_params into a safe place.
248 static inline void __init copy_edd(void)
250 memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer,
251 sizeof(edd.mbr_signature));
252 memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
253 edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
254 edd.edd_info_nr = boot_params.eddbuf_entries;
257 static inline void __init copy_edd(void)
262 void * __init extend_brk(size_t size, size_t align)
264 size_t mask = align - 1;
267 BUG_ON(_brk_start == 0);
268 BUG_ON(align & mask);
270 _brk_end = (_brk_end + mask) & ~mask;
271 BUG_ON((char *)(_brk_end + size) > __brk_limit);
273 ret = (void *)_brk_end;
276 memset(ret, 0, size);
282 static void __init init_gbpages(void)
284 if (direct_gbpages && cpu_has_gbpages)
285 printk(KERN_INFO "Using GB pages for direct mapping\n");
290 static inline void init_gbpages(void)
293 static void __init cleanup_highmap(void)
298 static void __init reserve_brk(void)
300 if (_brk_end > _brk_start)
301 memblock_reserve(__pa(_brk_start),
302 __pa(_brk_end) - __pa(_brk_start));
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)
314 /* Assume only end is not page aligned */
315 u64 ramdisk_image = boot_params.hdr.ramdisk_image;
316 u64 ramdisk_size = boot_params.hdr.ramdisk_size;
317 u64 area_size = PAGE_ALIGN(ramdisk_size);
318 u64 end_of_lowmem = max_low_pfn_mapped << PAGE_SHIFT;
320 unsigned long slop, clen, mapaddr;
323 /* We need to move the initrd down into lowmem */
324 ramdisk_here = memblock_find_in_range(0, end_of_lowmem, area_size,
328 panic("Cannot find place for new RAMDISK of size %lld\n",
331 /* Note: this includes all the lowmem currently occupied by
332 the initrd, we rely on that fact to keep the data intact. */
333 memblock_reserve(ramdisk_here, area_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 /* Assume only end is not page aligned */
377 u64 ramdisk_image = boot_params.hdr.ramdisk_image;
378 u64 ramdisk_size = boot_params.hdr.ramdisk_size;
379 u64 ramdisk_end = PAGE_ALIGN(ramdisk_image + ramdisk_size);
380 u64 end_of_lowmem = max_low_pfn_mapped << PAGE_SHIFT;
382 if (!boot_params.hdr.type_of_loader ||
383 !ramdisk_image || !ramdisk_size)
384 return; /* No initrd provided by bootloader */
388 if (ramdisk_size >= (end_of_lowmem>>1)) {
389 panic("initrd too large to handle, "
390 "disabling initrd (%lld needed, %lld available)\n",
391 ramdisk_size, end_of_lowmem>>1);
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 memblock_free(ramdisk_image, ramdisk_end - ramdisk_image);
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 u32 data_len, map_len;
430 map_len = max(PAGE_SIZE - (pa_data & ~PAGE_MASK),
431 (u64)sizeof(struct setup_data));
432 data = early_memremap(pa_data, map_len);
433 data_len = data->len + sizeof(struct setup_data);
434 if (data_len > map_len) {
435 early_iounmap(data, map_len);
436 data = early_memremap(pa_data, data_len);
440 switch (data->type) {
442 parse_e820_ext(data);
450 pa_data = data->next;
451 early_iounmap(data, map_len);
455 static void __init e820_reserve_setup_data(void)
457 struct setup_data *data;
461 if (boot_params.hdr.version < 0x0209)
463 pa_data = boot_params.hdr.setup_data;
465 data = early_memremap(pa_data, sizeof(*data));
466 e820_update_range(pa_data, sizeof(*data)+data->len,
467 E820_RAM, E820_RESERVED_KERN);
469 pa_data = data->next;
470 early_iounmap(data, sizeof(*data));
475 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
476 memcpy(&e820_saved, &e820, sizeof(struct e820map));
477 printk(KERN_INFO "extended physical RAM map:\n");
478 e820_print_map("reserve setup_data");
481 static void __init memblock_x86_reserve_range_setup_data(void)
483 struct setup_data *data;
486 if (boot_params.hdr.version < 0x0209)
488 pa_data = boot_params.hdr.setup_data;
490 data = early_memremap(pa_data, sizeof(*data));
491 memblock_reserve(pa_data, sizeof(*data) + data->len);
492 pa_data = data->next;
493 early_iounmap(data, sizeof(*data));
498 * --------- Crashkernel reservation ------------------------------
504 * Keep the crash kernel below this limit. On 32 bits earlier kernels
505 * would limit the kernel to the low 512 MiB due to mapping restrictions.
506 * On 64 bits, kexec-tools currently limits us to 896 MiB; increase this
507 * limit once kexec-tools are fixed.
510 # define CRASH_KERNEL_ADDR_MAX (512 << 20)
512 # define CRASH_KERNEL_ADDR_MAX (896 << 20)
515 static void __init reserve_crashkernel(void)
517 unsigned long long total_mem;
518 unsigned long long crash_size, crash_base;
521 total_mem = memblock_phys_mem_size();
523 ret = parse_crashkernel(boot_command_line, total_mem,
524 &crash_size, &crash_base);
525 if (ret != 0 || crash_size <= 0)
528 /* 0 means: find the address automatically */
529 if (crash_base <= 0) {
530 const unsigned long long alignment = 16<<20; /* 16M */
533 * kexec want bzImage is below CRASH_KERNEL_ADDR_MAX
535 crash_base = memblock_find_in_range(alignment,
536 CRASH_KERNEL_ADDR_MAX, crash_size, alignment);
539 pr_info("crashkernel reservation failed - No suitable area found.\n");
543 unsigned long long start;
545 start = memblock_find_in_range(crash_base,
546 crash_base + crash_size, crash_size, 1<<20);
547 if (start != crash_base) {
548 pr_info("crashkernel reservation failed - memory is in use.\n");
552 memblock_reserve(crash_base, crash_size);
554 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
555 "for crashkernel (System RAM: %ldMB)\n",
556 (unsigned long)(crash_size >> 20),
557 (unsigned long)(crash_base >> 20),
558 (unsigned long)(total_mem >> 20));
560 crashk_res.start = crash_base;
561 crashk_res.end = crash_base + crash_size - 1;
562 insert_resource(&iomem_resource, &crashk_res);
565 static void __init reserve_crashkernel(void)
570 static struct resource standard_io_resources[] = {
571 { .name = "dma1", .start = 0x00, .end = 0x1f,
572 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
573 { .name = "pic1", .start = 0x20, .end = 0x21,
574 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
575 { .name = "timer0", .start = 0x40, .end = 0x43,
576 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
577 { .name = "timer1", .start = 0x50, .end = 0x53,
578 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
579 { .name = "keyboard", .start = 0x60, .end = 0x60,
580 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
581 { .name = "keyboard", .start = 0x64, .end = 0x64,
582 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
583 { .name = "dma page reg", .start = 0x80, .end = 0x8f,
584 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
585 { .name = "pic2", .start = 0xa0, .end = 0xa1,
586 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
587 { .name = "dma2", .start = 0xc0, .end = 0xdf,
588 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
589 { .name = "fpu", .start = 0xf0, .end = 0xff,
590 .flags = IORESOURCE_BUSY | IORESOURCE_IO }
593 void __init reserve_standard_io_resources(void)
597 /* request I/O space for devices used on all i[345]86 PCs */
598 for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
599 request_resource(&ioport_resource, &standard_io_resources[i]);
603 static __init void reserve_ibft_region(void)
605 unsigned long addr, size = 0;
607 addr = find_ibft_region(&size);
610 memblock_reserve(addr, size);
613 static unsigned reserve_low = CONFIG_X86_RESERVE_LOW << 10;
615 static void __init trim_bios_range(void)
618 * A special case is the first 4Kb of memory;
619 * This is a BIOS owned area, not kernel ram, but generally
620 * not listed as such in the E820 table.
622 * This typically reserves additional memory (64KiB by default)
623 * since some BIOSes are known to corrupt low memory. See the
624 * Kconfig help text for X86_RESERVE_LOW.
626 e820_update_range(0, ALIGN(reserve_low, PAGE_SIZE),
627 E820_RAM, E820_RESERVED);
630 * special case: Some BIOSen report the PC BIOS
631 * area (640->1Mb) as ram even though it is not.
634 e820_remove_range(BIOS_BEGIN, BIOS_END - BIOS_BEGIN, E820_RAM, 1);
635 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
638 static int __init parse_reservelow(char *p)
640 unsigned long long size;
645 size = memparse(p, &p);
658 early_param("reservelow", parse_reservelow);
661 * Determine if we were loaded by an EFI loader. If so, then we have also been
662 * passed the efi memmap, systab, etc., so we should use these data structures
663 * for initialization. Note, the efi init code path is determined by the
664 * global efi_enabled. This allows the same kernel image to be used on existing
665 * systems (with a traditional BIOS) as well as on EFI systems.
668 * setup_arch - architecture-specific boot-time initializations
670 * Note: On x86_64, fixmaps are ready for use even before this is called.
673 void __init setup_arch(char **cmdline_p)
676 memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
677 visws_early_detect();
680 * copy kernel address range established so far and switch
681 * to the proper swapper page table
683 clone_pgd_range(swapper_pg_dir + KERNEL_PGD_BOUNDARY,
684 initial_page_table + KERNEL_PGD_BOUNDARY,
687 load_cr3(swapper_pg_dir);
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 machine_id = boot_params.sys_desc_table.table[0];
713 machine_submodel_id = boot_params.sys_desc_table.table[1];
714 BIOS_revision = boot_params.sys_desc_table.table[2];
717 saved_video_mode = boot_params.hdr.vid_mode;
718 bootloader_type = boot_params.hdr.type_of_loader;
719 if ((bootloader_type >> 4) == 0xe) {
720 bootloader_type &= 0xf;
721 bootloader_type |= (boot_params.hdr.ext_loader_type+0x10) << 4;
723 bootloader_version = bootloader_type & 0xf;
724 bootloader_version |= boot_params.hdr.ext_loader_ver << 4;
726 #ifdef CONFIG_BLK_DEV_RAM
727 rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
728 rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
729 rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
732 if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
736 } else if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
741 if (efi_enabled && efi_memblock_x86_reserve_range())
745 x86_init.oem.arch_setup();
747 iomem_resource.end = (1ULL << boot_cpu_data.x86_phys_bits) - 1;
750 /* update the e820_saved too */
751 e820_reserve_setup_data();
755 if (!boot_params.hdr.root_flags)
756 root_mountflags &= ~MS_RDONLY;
757 init_mm.start_code = (unsigned long) _text;
758 init_mm.end_code = (unsigned long) _etext;
759 init_mm.end_data = (unsigned long) _edata;
760 init_mm.brk = _brk_end;
762 code_resource.start = virt_to_phys(_text);
763 code_resource.end = virt_to_phys(_etext)-1;
764 data_resource.start = virt_to_phys(_etext);
765 data_resource.end = virt_to_phys(_edata)-1;
766 bss_resource.start = virt_to_phys(&__bss_start);
767 bss_resource.end = virt_to_phys(&__bss_stop)-1;
769 #ifdef CONFIG_CMDLINE_BOOL
770 #ifdef CONFIG_CMDLINE_OVERRIDE
771 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
773 if (builtin_cmdline[0]) {
774 /* append boot loader cmdline to builtin */
775 strlcat(builtin_cmdline, " ", COMMAND_LINE_SIZE);
776 strlcat(builtin_cmdline, boot_command_line, COMMAND_LINE_SIZE);
777 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
782 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
783 *cmdline_p = command_line;
786 * x86_configure_nx() is called before parse_early_param() to detect
787 * whether hardware doesn't support NX (so that the early EHCI debug
788 * console setup can safely call set_fixmap()). It may then be called
789 * again from within noexec_setup() during parsing early parameters
790 * to honor the respective command line option.
798 /* after early param, so could get panic from serial */
799 memblock_x86_reserve_range_setup_data();
801 if (acpi_mps_check()) {
802 #ifdef CONFIG_X86_LOCAL_APIC
805 setup_clear_cpu_cap(X86_FEATURE_APIC);
809 if (pci_early_dump_regs)
810 early_dump_pci_devices();
813 finish_e820_parsing();
821 * VMware detection requires dmi to be available, so this
822 * needs to be done after dmi_scan_machine, for the BP.
824 init_hypervisor_platform();
826 x86_init.resources.probe_roms();
828 /* after parse_early_param, so could debug it */
829 insert_resource(&iomem_resource, &code_resource);
830 insert_resource(&iomem_resource, &data_resource);
831 insert_resource(&iomem_resource, &bss_resource);
835 if (ppro_with_ram_bug()) {
836 e820_update_range(0x70000000ULL, 0x40000ULL, E820_RAM,
838 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
839 printk(KERN_INFO "fixed physical RAM map:\n");
840 e820_print_map("bad_ppro");
843 early_gart_iommu_check();
847 * partially used pages are not usable - thus
848 * we are rounding upwards:
850 max_pfn = e820_end_of_ram_pfn();
852 /* update e820 for memory not covered by WB MTRRs */
854 if (mtrr_trim_uncached_memory(max_pfn))
855 max_pfn = e820_end_of_ram_pfn();
858 /* max_low_pfn get updated here */
859 find_low_pfn_range();
861 num_physpages = max_pfn;
865 /* How many end-of-memory variables you have, grandma! */
866 /* need this before calling reserve_initrd */
867 if (max_pfn > (1UL<<(32 - PAGE_SHIFT)))
868 max_low_pfn = e820_end_of_low_ram_pfn();
870 max_low_pfn = max_pfn;
872 high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
876 * Find and reserve possible boot-time SMP configuration:
880 reserve_ibft_region();
883 * Need to conclude brk, before memblock_x86_fill()
884 * it could use memblock_find_in_range, could overlap with
891 memblock.current_limit = get_max_mapped();
895 * The EFI specification says that boot service code won't be called
896 * after ExitBootServices(). This is, in fact, a lie.
899 efi_reserve_boot_services();
901 /* preallocate 4k for mptable mpc */
902 early_reserve_e820_mpc_new();
904 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
905 setup_bios_corruption_check();
908 printk(KERN_DEBUG "initial memory mapped : 0 - %08lx\n",
909 max_pfn_mapped<<PAGE_SHIFT);
915 /* max_pfn_mapped is updated here */
916 max_low_pfn_mapped = init_memory_mapping(0, max_low_pfn<<PAGE_SHIFT);
917 max_pfn_mapped = max_low_pfn_mapped;
920 if (max_pfn > max_low_pfn) {
921 max_pfn_mapped = init_memory_mapping(1UL<<32,
922 max_pfn<<PAGE_SHIFT);
923 /* can we preseve max_low_pfn ?*/
924 max_low_pfn = max_pfn;
927 memblock.current_limit = get_max_mapped();
930 * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
933 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
934 if (init_ohci1394_dma_early)
935 init_ohci1394_dma_on_all_controllers();
937 /* Allocate bigger log buffer */
942 reserve_crashkernel();
949 * Parse the ACPI tables for possible boot-time SMP configuration.
951 acpi_boot_table_init();
953 early_acpi_boot_init();
956 memblock_find_dma_reserve();
958 #ifdef CONFIG_KVM_CLOCK
962 x86_init.paging.pagetable_setup_start(swapper_pg_dir);
964 x86_init.paging.pagetable_setup_done(swapper_pg_dir);
966 if (boot_cpu_data.cpuid_level >= 0) {
967 /* A CPU has %cr4 if and only if it has CPUID */
968 mmu_cr4_features = read_cr4();
972 /* sync back kernel address range */
973 clone_pgd_range(initial_page_table + KERNEL_PGD_BOUNDARY,
974 swapper_pg_dir + KERNEL_PGD_BOUNDARY,
984 generic_apic_probe();
989 * Read APIC and some other early information from ACPI tables.
996 * get boot-time SMP configuration:
998 if (smp_found_config)
1001 prefill_possible_map();
1005 init_apic_mappings();
1006 if (x86_io_apic_ops.init)
1007 x86_io_apic_ops.init();
1011 e820_reserve_resources();
1012 e820_mark_nosave_regions(max_low_pfn);
1014 x86_init.resources.reserve_resources();
1019 #if defined(CONFIG_VGA_CONSOLE)
1020 if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
1021 conswitchp = &vga_con;
1022 #elif defined(CONFIG_DUMMY_CONSOLE)
1023 conswitchp = &dummy_con;
1026 x86_init.oem.banner();
1028 x86_init.timers.wallclock_init();
1030 x86_platform.wallclock_init();
1034 arch_init_ideal_nops();
1037 #ifdef CONFIG_X86_32
1039 static struct resource video_ram_resource = {
1040 .name = "Video RAM area",
1043 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
1046 void __init i386_reserve_resources(void)
1048 request_resource(&iomem_resource, &video_ram_resource);
1049 reserve_standard_io_resources();
1052 #endif /* CONFIG_X86_32 */