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>
111 #include <asm/numa_64.h>
116 * end_pfn only includes RAM, while max_pfn_mapped includes all e820 entries.
117 * The direct mapping extends to max_pfn_mapped, so that we can directly access
118 * apertures, ACPI and other tables without having to play with fixmaps.
120 unsigned long max_low_pfn_mapped;
121 unsigned long max_pfn_mapped;
124 RESERVE_BRK(dmi_alloc, 65536);
128 static __initdata unsigned long _brk_start = (unsigned long)__brk_base;
129 unsigned long _brk_end = (unsigned long)__brk_base;
132 int default_cpu_present_to_apicid(int mps_cpu)
134 return __default_cpu_present_to_apicid(mps_cpu);
137 int default_check_phys_apicid_present(int phys_apicid)
139 return __default_check_phys_apicid_present(phys_apicid);
143 #ifndef CONFIG_DEBUG_BOOT_PARAMS
144 struct boot_params __initdata boot_params;
146 struct boot_params boot_params;
152 static struct resource data_resource = {
153 .name = "Kernel data",
156 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
159 static struct resource code_resource = {
160 .name = "Kernel code",
163 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
166 static struct resource bss_resource = {
167 .name = "Kernel bss",
170 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
175 /* cpu data as detected by the assembly code in head.S */
176 struct cpuinfo_x86 new_cpu_data __cpuinitdata = {0, 0, 0, 0, -1, 1, 0, 0, -1};
177 /* common cpu data for all cpus */
178 struct cpuinfo_x86 boot_cpu_data __read_mostly = {0, 0, 0, 0, -1, 1, 0, 0, -1};
179 EXPORT_SYMBOL(boot_cpu_data);
180 static void set_mca_bus(int x)
187 unsigned int def_to_bigsmp;
189 /* for MCA, but anyone else can use it if they want */
190 unsigned int machine_id;
191 unsigned int machine_submodel_id;
192 unsigned int BIOS_revision;
194 struct apm_info apm_info;
195 EXPORT_SYMBOL(apm_info);
197 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
198 defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
199 struct ist_info ist_info;
200 EXPORT_SYMBOL(ist_info);
202 struct ist_info ist_info;
206 struct cpuinfo_x86 boot_cpu_data __read_mostly = {
207 .x86_phys_bits = MAX_PHYSMEM_BITS,
209 EXPORT_SYMBOL(boot_cpu_data);
213 #if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64)
214 unsigned long mmu_cr4_features;
216 unsigned long mmu_cr4_features = X86_CR4_PAE;
219 /* Boot loader ID and version as integers, for the benefit of proc_dointvec */
220 int bootloader_type, bootloader_version;
225 struct screen_info screen_info;
226 EXPORT_SYMBOL(screen_info);
227 struct edid_info edid_info;
228 EXPORT_SYMBOL_GPL(edid_info);
230 extern int root_mountflags;
232 unsigned long saved_video_mode;
234 #define RAMDISK_IMAGE_START_MASK 0x07FF
235 #define RAMDISK_PROMPT_FLAG 0x8000
236 #define RAMDISK_LOAD_FLAG 0x4000
238 static char __initdata command_line[COMMAND_LINE_SIZE];
239 #ifdef CONFIG_CMDLINE_BOOL
240 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
243 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
245 #ifdef CONFIG_EDD_MODULE
249 * copy_edd() - Copy the BIOS EDD information
250 * from boot_params into a safe place.
253 static inline void __init copy_edd(void)
255 memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer,
256 sizeof(edd.mbr_signature));
257 memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
258 edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
259 edd.edd_info_nr = boot_params.eddbuf_entries;
262 static inline void __init copy_edd(void)
267 void * __init extend_brk(size_t size, size_t align)
269 size_t mask = align - 1;
272 BUG_ON(_brk_start == 0);
273 BUG_ON(align & mask);
275 _brk_end = (_brk_end + mask) & ~mask;
276 BUG_ON((char *)(_brk_end + size) > __brk_limit);
278 ret = (void *)_brk_end;
281 memset(ret, 0, size);
287 static void __init init_gbpages(void)
289 if (direct_gbpages && cpu_has_gbpages)
290 printk(KERN_INFO "Using GB pages for direct mapping\n");
295 static inline void init_gbpages(void)
300 static void __init reserve_brk(void)
302 if (_brk_end > _brk_start)
303 reserve_early(__pa(_brk_start), __pa(_brk_end), "BRK");
305 /* Mark brk area as locked down and no longer taking any
310 #ifdef CONFIG_BLK_DEV_INITRD
312 #define MAX_MAP_CHUNK (NR_FIX_BTMAPS << PAGE_SHIFT)
313 static void __init relocate_initrd(void)
315 /* Assume only end is not page aligned */
316 u64 ramdisk_image = boot_params.hdr.ramdisk_image;
317 u64 ramdisk_size = boot_params.hdr.ramdisk_size;
318 u64 area_size = PAGE_ALIGN(ramdisk_size);
319 u64 end_of_lowmem = max_low_pfn_mapped << PAGE_SHIFT;
321 unsigned long slop, clen, mapaddr;
324 /* We need to move the initrd down into lowmem */
325 ramdisk_here = find_e820_area(0, end_of_lowmem, area_size,
328 if (ramdisk_here == -1ULL)
329 panic("Cannot find place for new RAMDISK of size %lld\n",
332 /* Note: this includes all the lowmem currently occupied by
333 the initrd, we rely on that fact to keep the data intact. */
334 reserve_early(ramdisk_here, ramdisk_here + area_size,
336 initrd_start = ramdisk_here + PAGE_OFFSET;
337 initrd_end = initrd_start + ramdisk_size;
338 printk(KERN_INFO "Allocated new RAMDISK: %08llx - %08llx\n",
339 ramdisk_here, ramdisk_here + ramdisk_size);
341 q = (char *)initrd_start;
343 /* Copy any lowmem portion of the initrd */
344 if (ramdisk_image < end_of_lowmem) {
345 clen = end_of_lowmem - ramdisk_image;
346 p = (char *)__va(ramdisk_image);
349 ramdisk_image += clen;
350 ramdisk_size -= clen;
353 /* Copy the highmem portion of the initrd */
354 while (ramdisk_size) {
355 slop = ramdisk_image & ~PAGE_MASK;
357 if (clen > MAX_MAP_CHUNK-slop)
358 clen = MAX_MAP_CHUNK-slop;
359 mapaddr = ramdisk_image & PAGE_MASK;
360 p = early_memremap(mapaddr, clen+slop);
361 memcpy(q, p+slop, clen);
362 early_iounmap(p, clen+slop);
364 ramdisk_image += clen;
365 ramdisk_size -= clen;
367 /* high pages is not converted by early_res_to_bootmem */
368 ramdisk_image = boot_params.hdr.ramdisk_image;
369 ramdisk_size = boot_params.hdr.ramdisk_size;
370 printk(KERN_INFO "Move RAMDISK from %016llx - %016llx to"
371 " %08llx - %08llx\n",
372 ramdisk_image, ramdisk_image + ramdisk_size - 1,
373 ramdisk_here, ramdisk_here + ramdisk_size - 1);
376 static void __init reserve_initrd(void)
378 /* Assume only end is not page aligned */
379 u64 ramdisk_image = boot_params.hdr.ramdisk_image;
380 u64 ramdisk_size = boot_params.hdr.ramdisk_size;
381 u64 ramdisk_end = PAGE_ALIGN(ramdisk_image + ramdisk_size);
382 u64 end_of_lowmem = max_low_pfn_mapped << PAGE_SHIFT;
384 if (!boot_params.hdr.type_of_loader ||
385 !ramdisk_image || !ramdisk_size)
386 return; /* No initrd provided by bootloader */
390 if (ramdisk_size >= (end_of_lowmem>>1)) {
391 free_early(ramdisk_image, ramdisk_end);
392 printk(KERN_ERR "initrd too large to handle, "
393 "disabling initrd\n");
397 printk(KERN_INFO "RAMDISK: %08llx - %08llx\n", ramdisk_image,
401 if (ramdisk_end <= end_of_lowmem) {
402 /* All in lowmem, easy case */
404 * don't need to reserve again, already reserved early
405 * in i386_start_kernel
407 initrd_start = ramdisk_image + PAGE_OFFSET;
408 initrd_end = initrd_start + ramdisk_size;
414 free_early(ramdisk_image, ramdisk_end);
417 static void __init reserve_initrd(void)
420 #endif /* CONFIG_BLK_DEV_INITRD */
422 static void __init parse_setup_data(void)
424 struct setup_data *data;
427 if (boot_params.hdr.version < 0x0209)
429 pa_data = boot_params.hdr.setup_data;
431 data = early_memremap(pa_data, PAGE_SIZE);
432 switch (data->type) {
434 parse_e820_ext(data, pa_data);
439 pa_data = data->next;
440 early_iounmap(data, PAGE_SIZE);
444 static void __init e820_reserve_setup_data(void)
446 struct setup_data *data;
450 if (boot_params.hdr.version < 0x0209)
452 pa_data = boot_params.hdr.setup_data;
454 data = early_memremap(pa_data, sizeof(*data));
455 e820_update_range(pa_data, sizeof(*data)+data->len,
456 E820_RAM, E820_RESERVED_KERN);
458 pa_data = data->next;
459 early_iounmap(data, sizeof(*data));
464 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
465 memcpy(&e820_saved, &e820, sizeof(struct e820map));
466 printk(KERN_INFO "extended physical RAM map:\n");
467 e820_print_map("reserve setup_data");
470 static void __init reserve_early_setup_data(void)
472 struct setup_data *data;
476 if (boot_params.hdr.version < 0x0209)
478 pa_data = boot_params.hdr.setup_data;
480 data = early_memremap(pa_data, sizeof(*data));
481 sprintf(buf, "setup data %x", data->type);
482 reserve_early(pa_data, pa_data+sizeof(*data)+data->len, buf);
483 pa_data = data->next;
484 early_iounmap(data, sizeof(*data));
489 * --------- Crashkernel reservation ------------------------------
494 static inline unsigned long long get_total_mem(void)
496 unsigned long long total;
498 total = max_pfn - min_low_pfn;
500 return total << PAGE_SHIFT;
503 static void __init reserve_crashkernel(void)
505 unsigned long long total_mem;
506 unsigned long long crash_size, crash_base;
509 total_mem = get_total_mem();
511 ret = parse_crashkernel(boot_command_line, total_mem,
512 &crash_size, &crash_base);
513 if (ret != 0 || crash_size <= 0)
516 /* 0 means: find the address automatically */
517 if (crash_base <= 0) {
518 const unsigned long long alignment = 16<<20; /* 16M */
520 crash_base = find_e820_area(alignment, ULONG_MAX, crash_size,
522 if (crash_base == -1ULL) {
523 pr_info("crashkernel reservation failed - No suitable area found.\n");
527 unsigned long long start;
529 start = find_e820_area(crash_base, ULONG_MAX, crash_size,
531 if (start != crash_base) {
532 pr_info("crashkernel reservation failed - memory is in use.\n");
536 reserve_early(crash_base, crash_base + crash_size, "CRASH KERNEL");
538 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
539 "for crashkernel (System RAM: %ldMB)\n",
540 (unsigned long)(crash_size >> 20),
541 (unsigned long)(crash_base >> 20),
542 (unsigned long)(total_mem >> 20));
544 crashk_res.start = crash_base;
545 crashk_res.end = crash_base + crash_size - 1;
546 insert_resource(&iomem_resource, &crashk_res);
549 static void __init reserve_crashkernel(void)
554 static struct resource standard_io_resources[] = {
555 { .name = "dma1", .start = 0x00, .end = 0x1f,
556 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
557 { .name = "pic1", .start = 0x20, .end = 0x21,
558 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
559 { .name = "timer0", .start = 0x40, .end = 0x43,
560 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
561 { .name = "timer1", .start = 0x50, .end = 0x53,
562 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
563 { .name = "keyboard", .start = 0x60, .end = 0x60,
564 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
565 { .name = "keyboard", .start = 0x64, .end = 0x64,
566 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
567 { .name = "dma page reg", .start = 0x80, .end = 0x8f,
568 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
569 { .name = "pic2", .start = 0xa0, .end = 0xa1,
570 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
571 { .name = "dma2", .start = 0xc0, .end = 0xdf,
572 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
573 { .name = "fpu", .start = 0xf0, .end = 0xff,
574 .flags = IORESOURCE_BUSY | IORESOURCE_IO }
577 void __init reserve_standard_io_resources(void)
581 /* request I/O space for devices used on all i[345]86 PCs */
582 for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
583 request_resource(&ioport_resource, &standard_io_resources[i]);
588 * Note: elfcorehdr_addr is not just limited to vmcore. It is also used by
589 * is_kdump_kernel() to determine if we are booting after a panic. Hence
590 * ifdef it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE.
593 #ifdef CONFIG_CRASH_DUMP
594 /* elfcorehdr= specifies the location of elf core header
595 * stored by the crashed kernel. This option will be passed
596 * by kexec loader to the capture kernel.
598 static int __init setup_elfcorehdr(char *arg)
603 elfcorehdr_addr = memparse(arg, &end);
604 return end > arg ? 0 : -EINVAL;
606 early_param("elfcorehdr", setup_elfcorehdr);
609 static __init void reserve_ibft_region(void)
611 unsigned long addr, size = 0;
613 addr = find_ibft_region(&size);
616 reserve_early_overlap_ok(addr, addr + size, "ibft");
619 #ifdef CONFIG_X86_RESERVE_LOW_64K
620 static int __init dmi_low_memory_corruption(const struct dmi_system_id *d)
623 "%s detected: BIOS may corrupt low RAM, working around it.\n",
626 e820_update_range(0, 0x10000, E820_RAM, E820_RESERVED);
627 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
633 /* List of systems that have known low memory corruption BIOS problems */
634 static struct dmi_system_id __initdata bad_bios_dmi_table[] = {
635 #ifdef CONFIG_X86_RESERVE_LOW_64K
637 .callback = dmi_low_memory_corruption,
640 DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
644 .callback = dmi_low_memory_corruption,
645 .ident = "Phoenix BIOS",
647 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies"),
651 .callback = dmi_low_memory_corruption,
652 .ident = "Phoenix/MSC BIOS",
654 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix/MSC"),
658 * AMI BIOS with low memory corruption was found on Intel DG45ID and
660 * It has a different DMI_BIOS_VENDOR = "Intel Corp.", for now we will
661 * match only DMI_BOARD_NAME and see if there is more bad products
665 .callback = dmi_low_memory_corruption,
668 DMI_MATCH(DMI_BOARD_NAME, "DG45ID"),
672 .callback = dmi_low_memory_corruption,
675 DMI_MATCH(DMI_BOARD_NAME, "DG45FC"),
679 * The Dell Inspiron Mini 1012 has DMI_BIOS_VENDOR = "Dell Inc.", so
680 * match on the product name.
683 .callback = dmi_low_memory_corruption,
684 .ident = "Phoenix BIOS",
686 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1012"),
693 static void __init trim_bios_range(void)
696 * A special case is the first 4Kb of memory;
697 * This is a BIOS owned area, not kernel ram, but generally
698 * not listed as such in the E820 table.
700 e820_update_range(0, PAGE_SIZE, E820_RAM, E820_RESERVED);
702 * special case: Some BIOSen report the PC BIOS
703 * area (640->1Mb) as ram even though it is not.
706 e820_remove_range(BIOS_BEGIN, BIOS_END - BIOS_BEGIN, E820_RAM, 1);
707 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
711 * Determine if we were loaded by an EFI loader. If so, then we have also been
712 * passed the efi memmap, systab, etc., so we should use these data structures
713 * for initialization. Note, the efi init code path is determined by the
714 * global efi_enabled. This allows the same kernel image to be used on existing
715 * systems (with a traditional BIOS) as well as on EFI systems.
718 * setup_arch - architecture-specific boot-time initializations
720 * Note: On x86_64, fixmaps are ready for use even before this is called.
723 void __init setup_arch(char **cmdline_p)
729 memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
730 visws_early_detect();
732 printk(KERN_INFO "Command line: %s\n", boot_command_line);
736 * If we have OLPC OFW, we might end up relocating the fixmap due to
737 * reserve_top(), so do this before touching the ioremap area.
743 early_ioremap_init();
745 setup_olpc_ofw_pgd();
747 ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
748 screen_info = boot_params.screen_info;
749 edid_info = boot_params.edid_info;
751 apm_info.bios = boot_params.apm_bios_info;
752 ist_info = boot_params.ist_info;
753 if (boot_params.sys_desc_table.length != 0) {
754 set_mca_bus(boot_params.sys_desc_table.table[3] & 0x2);
755 machine_id = boot_params.sys_desc_table.table[0];
756 machine_submodel_id = boot_params.sys_desc_table.table[1];
757 BIOS_revision = boot_params.sys_desc_table.table[2];
760 saved_video_mode = boot_params.hdr.vid_mode;
761 bootloader_type = boot_params.hdr.type_of_loader;
762 if ((bootloader_type >> 4) == 0xe) {
763 bootloader_type &= 0xf;
764 bootloader_type |= (boot_params.hdr.ext_loader_type+0x10) << 4;
766 bootloader_version = bootloader_type & 0xf;
767 bootloader_version |= boot_params.hdr.ext_loader_ver << 4;
769 #ifdef CONFIG_BLK_DEV_RAM
770 rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
771 rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
772 rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
775 if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
787 x86_init.oem.arch_setup();
791 /* update the e820_saved too */
792 e820_reserve_setup_data();
796 if (!boot_params.hdr.root_flags)
797 root_mountflags &= ~MS_RDONLY;
798 init_mm.start_code = (unsigned long) _text;
799 init_mm.end_code = (unsigned long) _etext;
800 init_mm.end_data = (unsigned long) _edata;
801 init_mm.brk = _brk_end;
803 code_resource.start = virt_to_phys(_text);
804 code_resource.end = virt_to_phys(_etext)-1;
805 data_resource.start = virt_to_phys(_etext);
806 data_resource.end = virt_to_phys(_edata)-1;
807 bss_resource.start = virt_to_phys(&__bss_start);
808 bss_resource.end = virt_to_phys(&__bss_stop)-1;
810 #ifdef CONFIG_CMDLINE_BOOL
811 #ifdef CONFIG_CMDLINE_OVERRIDE
812 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
814 if (builtin_cmdline[0]) {
815 /* append boot loader cmdline to builtin */
816 strlcat(builtin_cmdline, " ", COMMAND_LINE_SIZE);
817 strlcat(builtin_cmdline, boot_command_line, COMMAND_LINE_SIZE);
818 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
823 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
824 *cmdline_p = command_line;
827 * x86_configure_nx() is called before parse_early_param() to detect
828 * whether hardware doesn't support NX (so that the early EHCI debug
829 * console setup can safely call set_fixmap()). It may then be called
830 * again from within noexec_setup() during parsing early parameters
831 * to honor the respective command line option.
839 /* after early param, so could get panic from serial */
840 reserve_early_setup_data();
842 if (acpi_mps_check()) {
843 #ifdef CONFIG_X86_LOCAL_APIC
846 setup_clear_cpu_cap(X86_FEATURE_APIC);
850 if (pci_early_dump_regs)
851 early_dump_pci_devices();
854 finish_e820_parsing();
861 dmi_check_system(bad_bios_dmi_table);
864 * VMware detection requires dmi to be available, so this
865 * needs to be done after dmi_scan_machine, for the BP.
867 init_hypervisor_platform();
869 x86_init.resources.probe_roms();
871 /* after parse_early_param, so could debug it */
872 insert_resource(&iomem_resource, &code_resource);
873 insert_resource(&iomem_resource, &data_resource);
874 insert_resource(&iomem_resource, &bss_resource);
878 if (ppro_with_ram_bug()) {
879 e820_update_range(0x70000000ULL, 0x40000ULL, E820_RAM,
881 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
882 printk(KERN_INFO "fixed physical RAM map:\n");
883 e820_print_map("bad_ppro");
886 early_gart_iommu_check();
890 * partially used pages are not usable - thus
891 * we are rounding upwards:
893 max_pfn = e820_end_of_ram_pfn();
895 /* preallocate 4k for mptable mpc */
896 early_reserve_e820_mpc_new();
897 /* update e820 for memory not covered by WB MTRRs */
899 if (mtrr_trim_uncached_memory(max_pfn))
900 max_pfn = e820_end_of_ram_pfn();
903 /* max_low_pfn get updated here */
904 find_low_pfn_range();
906 num_physpages = max_pfn;
910 /* How many end-of-memory variables you have, grandma! */
911 /* need this before calling reserve_initrd */
912 if (max_pfn > (1UL<<(32 - PAGE_SHIFT)))
913 max_low_pfn = e820_end_of_low_ram_pfn();
915 max_low_pfn = max_pfn;
917 high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
918 max_pfn_mapped = KERNEL_IMAGE_SIZE >> PAGE_SHIFT;
921 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
922 setup_bios_corruption_check();
925 printk(KERN_DEBUG "initial memory mapped : 0 - %08lx\n",
926 max_pfn_mapped<<PAGE_SHIFT);
931 * Find and reserve possible boot-time SMP configuration:
935 reserve_ibft_region();
937 reserve_trampoline_memory();
939 #ifdef CONFIG_ACPI_SLEEP
941 * Reserve low memory region for sleep support.
942 * even before init_memory_mapping
944 acpi_reserve_wakeup_memory();
948 /* max_pfn_mapped is updated here */
949 max_low_pfn_mapped = init_memory_mapping(0, max_low_pfn<<PAGE_SHIFT);
950 max_pfn_mapped = max_low_pfn_mapped;
953 if (max_pfn > max_low_pfn) {
954 max_pfn_mapped = init_memory_mapping(1UL<<32,
955 max_pfn<<PAGE_SHIFT);
956 /* can we preseve max_low_pfn ?*/
957 max_low_pfn = max_pfn;
962 * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
965 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
966 if (init_ohci1394_dma_early)
967 init_ohci1394_dma_on_all_controllers();
972 reserve_crashkernel();
979 * Parse the ACPI tables for possible boot-time SMP configuration.
981 acpi_boot_table_init();
983 early_acpi_boot_init();
985 #ifdef CONFIG_ACPI_NUMA
987 * Parse SRAT to discover nodes.
989 acpi = acpi_numa_init();
992 #ifdef CONFIG_K8_NUMA
994 k8 = !k8_numa_init(0, max_pfn);
997 initmem_init(0, max_pfn, acpi, k8);
998 #ifndef CONFIG_NO_BOOTMEM
999 early_res_to_bootmem(0, max_low_pfn<<PAGE_SHIFT);
1002 dma32_reserve_bootmem();
1004 #ifdef CONFIG_KVM_CLOCK
1008 x86_init.paging.pagetable_setup_start(swapper_pg_dir);
1010 x86_init.paging.pagetable_setup_done(swapper_pg_dir);
1012 setup_trampoline_page_table();
1016 #ifdef CONFIG_X86_64
1020 generic_apic_probe();
1025 * Read APIC and some other early information from ACPI tables.
1032 * get boot-time SMP configuration:
1034 if (smp_found_config)
1037 prefill_possible_map();
1039 #ifdef CONFIG_X86_64
1043 init_apic_mappings();
1044 ioapic_init_mappings();
1046 /* need to wait for io_apic is mapped */
1047 probe_nr_irqs_gsi();
1051 e820_reserve_resources();
1052 e820_mark_nosave_regions(max_low_pfn);
1054 x86_init.resources.reserve_resources();
1059 #if defined(CONFIG_VGA_CONSOLE)
1060 if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
1061 conswitchp = &vga_con;
1062 #elif defined(CONFIG_DUMMY_CONSOLE)
1063 conswitchp = &dummy_con;
1066 x86_init.oem.banner();
1071 #ifdef CONFIG_X86_32
1073 static struct resource video_ram_resource = {
1074 .name = "Video RAM area",
1077 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
1080 void __init i386_reserve_resources(void)
1082 request_resource(&iomem_resource, &video_ram_resource);
1083 reserve_standard_io_resources();
1086 #endif /* CONFIG_X86_32 */