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/mca.h>
38 #include <linux/root_dev.h>
39 #include <linux/highmem.h>
40 #include <linux/module.h>
41 #include <linux/efi.h>
42 #include <linux/init.h>
43 #include <linux/edd.h>
44 #include <linux/iscsi_ibft.h>
45 #include <linux/nodemask.h>
46 #include <linux/kexec.h>
47 #include <linux/dmi.h>
48 #include <linux/pfn.h>
49 #include <linux/pci.h>
50 #include <asm/pci-direct.h>
51 #include <linux/init_ohci1394_dma.h>
52 #include <linux/kvm_para.h>
54 #include <linux/errno.h>
55 #include <linux/kernel.h>
56 #include <linux/stddef.h>
57 #include <linux/unistd.h>
58 #include <linux/ptrace.h>
59 #include <linux/user.h>
60 #include <linux/delay.h>
62 #include <linux/kallsyms.h>
63 #include <linux/cpufreq.h>
64 #include <linux/dma-mapping.h>
65 #include <linux/ctype.h>
66 #include <linux/uaccess.h>
68 #include <linux/percpu.h>
69 #include <linux/crash_dump.h>
70 #include <linux/tboot.h>
72 #include <video/edid.h>
76 #include <asm/trampoline.h>
78 #include <asm/mpspec.h>
79 #include <asm/setup.h>
81 #include <asm/timer.h>
82 #include <asm/i8259.h>
83 #include <asm/sections.h>
85 #include <asm/io_apic.h>
87 #include <asm/setup_arch.h>
88 #include <asm/bios_ebda.h>
89 #include <asm/cacheflush.h>
90 #include <asm/processor.h>
93 #include <asm/system.h>
94 #include <asm/vsyscall.h>
98 #include <asm/iommu.h>
100 #include <asm/mmu_context.h>
101 #include <asm/proto.h>
103 #include <asm/paravirt.h>
104 #include <asm/hypervisor.h>
105 #include <asm/olpc_ofw.h>
107 #include <asm/percpu.h>
108 #include <asm/topology.h>
109 #include <asm/apicdef.h>
110 #include <asm/amd_nb.h>
112 #include <asm/numa_64.h>
115 #include <asm/alternative.h>
116 #include <asm/prom.h>
117 #include <asm/kaiser.h>
120 * end_pfn only includes RAM, while max_pfn_mapped includes all e820 entries.
121 * The direct mapping extends to max_pfn_mapped, so that we can directly access
122 * apertures, ACPI and other tables without having to play with fixmaps.
124 unsigned long max_low_pfn_mapped;
125 unsigned long max_pfn_mapped;
128 RESERVE_BRK(dmi_alloc, 65536);
132 static __initdata unsigned long _brk_start = (unsigned long)__brk_base;
133 unsigned long _brk_end = (unsigned long)__brk_base;
136 int default_cpu_present_to_apicid(int mps_cpu)
138 return __default_cpu_present_to_apicid(mps_cpu);
141 int default_check_phys_apicid_present(int phys_apicid)
143 return __default_check_phys_apicid_present(phys_apicid);
147 #ifndef CONFIG_DEBUG_BOOT_PARAMS
148 struct boot_params __initdata boot_params;
150 struct boot_params boot_params;
156 static struct resource data_resource = {
157 .name = "Kernel data",
160 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
163 static struct resource code_resource = {
164 .name = "Kernel code",
167 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
170 static struct resource bss_resource = {
171 .name = "Kernel bss",
174 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
179 /* cpu data as detected by the assembly code in head.S */
180 struct cpuinfo_x86 new_cpu_data __cpuinitdata = {0, 0, 0, 0, -1, 1, 0, 0, -1};
181 /* common cpu data for all cpus */
182 struct cpuinfo_x86 boot_cpu_data __read_mostly = {0, 0, 0, 0, -1, 1, 0, 0, -1};
183 EXPORT_SYMBOL(boot_cpu_data);
184 static void set_mca_bus(int x)
191 unsigned int def_to_bigsmp;
193 /* for MCA, but anyone else can use it if they want */
194 unsigned int machine_id;
195 unsigned int machine_submodel_id;
196 unsigned int BIOS_revision;
198 struct apm_info apm_info;
199 EXPORT_SYMBOL(apm_info);
201 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
202 defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
203 struct ist_info ist_info;
204 EXPORT_SYMBOL(ist_info);
206 struct ist_info ist_info;
210 struct cpuinfo_x86 boot_cpu_data __read_mostly = {
211 .x86_phys_bits = MAX_PHYSMEM_BITS,
213 EXPORT_SYMBOL(boot_cpu_data);
217 #if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64)
218 unsigned long mmu_cr4_features;
220 unsigned long mmu_cr4_features = X86_CR4_PAE;
223 /* Boot loader ID and version as integers, for the benefit of proc_dointvec */
224 int bootloader_type, bootloader_version;
229 struct screen_info screen_info;
230 EXPORT_SYMBOL(screen_info);
231 struct edid_info edid_info;
232 EXPORT_SYMBOL_GPL(edid_info);
234 extern int root_mountflags;
236 unsigned long saved_video_mode;
238 #define RAMDISK_IMAGE_START_MASK 0x07FF
239 #define RAMDISK_PROMPT_FLAG 0x8000
240 #define RAMDISK_LOAD_FLAG 0x4000
242 static char __initdata command_line[COMMAND_LINE_SIZE];
243 #ifdef CONFIG_CMDLINE_BOOL
244 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
247 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
249 #ifdef CONFIG_EDD_MODULE
253 * copy_edd() - Copy the BIOS EDD information
254 * from boot_params into a safe place.
257 static inline void __init copy_edd(void)
259 memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer,
260 sizeof(edd.mbr_signature));
261 memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
262 edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
263 edd.edd_info_nr = boot_params.eddbuf_entries;
266 static inline void __init copy_edd(void)
271 void * __init extend_brk(size_t size, size_t align)
273 size_t mask = align - 1;
276 BUG_ON(_brk_start == 0);
277 BUG_ON(align & mask);
279 _brk_end = (_brk_end + mask) & ~mask;
280 BUG_ON((char *)(_brk_end + size) > __brk_limit);
282 ret = (void *)_brk_end;
285 memset(ret, 0, size);
291 static void __init init_gbpages(void)
293 if (direct_gbpages && cpu_has_gbpages)
294 printk(KERN_INFO "Using GB pages for direct mapping\n");
299 static inline void init_gbpages(void)
302 static void __init cleanup_highmap(void)
307 static void __init reserve_brk(void)
309 if (_brk_end > _brk_start)
310 memblock_x86_reserve_range(__pa(_brk_start), __pa(_brk_end), "BRK");
312 /* Mark brk area as locked down and no longer taking any
317 #ifdef CONFIG_BLK_DEV_INITRD
319 #define MAX_MAP_CHUNK (NR_FIX_BTMAPS << PAGE_SHIFT)
320 static void __init relocate_initrd(void)
322 /* Assume only end is not page aligned */
323 u64 ramdisk_image = boot_params.hdr.ramdisk_image;
324 u64 ramdisk_size = boot_params.hdr.ramdisk_size;
325 u64 area_size = PAGE_ALIGN(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 = memblock_find_in_range(0, end_of_lowmem, area_size,
335 if (ramdisk_here == MEMBLOCK_ERROR)
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 memblock_x86_reserve_range(ramdisk_here, ramdisk_here + area_size, "NEW RAMDISK");
342 initrd_start = ramdisk_here + PAGE_OFFSET;
343 initrd_end = initrd_start + ramdisk_size;
344 printk(KERN_INFO "Allocated new RAMDISK: %08llx - %08llx\n",
345 ramdisk_here, ramdisk_here + ramdisk_size);
347 q = (char *)initrd_start;
349 /* Copy any lowmem portion of the initrd */
350 if (ramdisk_image < end_of_lowmem) {
351 clen = end_of_lowmem - ramdisk_image;
352 p = (char *)__va(ramdisk_image);
355 ramdisk_image += clen;
356 ramdisk_size -= clen;
359 /* Copy the highmem portion of the initrd */
360 while (ramdisk_size) {
361 slop = ramdisk_image & ~PAGE_MASK;
363 if (clen > MAX_MAP_CHUNK-slop)
364 clen = MAX_MAP_CHUNK-slop;
365 mapaddr = ramdisk_image & PAGE_MASK;
366 p = early_memremap(mapaddr, clen+slop);
367 memcpy(q, p+slop, clen);
368 early_iounmap(p, clen+slop);
370 ramdisk_image += clen;
371 ramdisk_size -= clen;
373 /* high pages is not converted by early_res_to_bootmem */
374 ramdisk_image = boot_params.hdr.ramdisk_image;
375 ramdisk_size = boot_params.hdr.ramdisk_size;
376 printk(KERN_INFO "Move RAMDISK from %016llx - %016llx to"
377 " %08llx - %08llx\n",
378 ramdisk_image, ramdisk_image + ramdisk_size - 1,
379 ramdisk_here, ramdisk_here + ramdisk_size - 1);
382 static void __init reserve_initrd(void)
384 /* Assume only end is not page aligned */
385 u64 ramdisk_image = boot_params.hdr.ramdisk_image;
386 u64 ramdisk_size = boot_params.hdr.ramdisk_size;
387 u64 ramdisk_end = PAGE_ALIGN(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 memblock_x86_free_range(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 memblock_x86_free_range(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 u32 data_len, map_len;
439 map_len = max(PAGE_SIZE - (pa_data & ~PAGE_MASK),
440 (u64)sizeof(struct setup_data));
441 data = early_memremap(pa_data, map_len);
442 data_len = data->len + sizeof(struct setup_data);
443 if (data_len > map_len) {
444 early_iounmap(data, map_len);
445 data = early_memremap(pa_data, data_len);
449 switch (data->type) {
451 parse_e820_ext(data);
459 pa_data = data->next;
460 early_iounmap(data, map_len);
464 static void __init e820_reserve_setup_data(void)
466 struct setup_data *data;
470 if (boot_params.hdr.version < 0x0209)
472 pa_data = boot_params.hdr.setup_data;
474 data = early_memremap(pa_data, sizeof(*data));
475 e820_update_range(pa_data, sizeof(*data)+data->len,
476 E820_RAM, E820_RESERVED_KERN);
478 pa_data = data->next;
479 early_iounmap(data, sizeof(*data));
484 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
485 memcpy(&e820_saved, &e820, sizeof(struct e820map));
486 printk(KERN_INFO "extended physical RAM map:\n");
487 e820_print_map("reserve setup_data");
490 static void __init memblock_x86_reserve_range_setup_data(void)
492 struct setup_data *data;
496 if (boot_params.hdr.version < 0x0209)
498 pa_data = boot_params.hdr.setup_data;
500 data = early_memremap(pa_data, sizeof(*data));
501 sprintf(buf, "setup data %x", data->type);
502 memblock_x86_reserve_range(pa_data, pa_data+sizeof(*data)+data->len, buf);
503 pa_data = data->next;
504 early_iounmap(data, sizeof(*data));
509 * --------- Crashkernel reservation ------------------------------
514 static inline unsigned long long get_total_mem(void)
516 unsigned long long total;
518 total = max_pfn - min_low_pfn;
520 return total << PAGE_SHIFT;
524 * Keep the crash kernel below this limit. On 32 bits earlier kernels
525 * would limit the kernel to the low 512 MiB due to mapping restrictions.
526 * On 64 bits, kexec-tools currently limits us to 896 MiB; increase this
527 * limit once kexec-tools are fixed.
530 # define CRASH_KERNEL_ADDR_MAX (512 << 20)
532 # define CRASH_KERNEL_ADDR_MAX (896 << 20)
535 static void __init reserve_crashkernel(void)
537 unsigned long long total_mem;
538 unsigned long long crash_size, crash_base;
541 total_mem = get_total_mem();
543 ret = parse_crashkernel(boot_command_line, total_mem,
544 &crash_size, &crash_base);
545 if (ret != 0 || crash_size <= 0)
548 /* 0 means: find the address automatically */
549 if (crash_base <= 0) {
550 const unsigned long long alignment = 16<<20; /* 16M */
553 * kexec want bzImage is below CRASH_KERNEL_ADDR_MAX
555 crash_base = memblock_find_in_range(alignment,
556 CRASH_KERNEL_ADDR_MAX, crash_size, alignment);
558 if (crash_base == MEMBLOCK_ERROR) {
559 pr_info("crashkernel reservation failed - No suitable area found.\n");
563 unsigned long long start;
565 start = memblock_find_in_range(crash_base,
566 crash_base + crash_size, crash_size, 1<<20);
567 if (start != crash_base) {
568 pr_info("crashkernel reservation failed - memory is in use.\n");
572 memblock_x86_reserve_range(crash_base, crash_base + crash_size, "CRASH KERNEL");
574 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
575 "for crashkernel (System RAM: %ldMB)\n",
576 (unsigned long)(crash_size >> 20),
577 (unsigned long)(crash_base >> 20),
578 (unsigned long)(total_mem >> 20));
580 crashk_res.start = crash_base;
581 crashk_res.end = crash_base + crash_size - 1;
582 insert_resource(&iomem_resource, &crashk_res);
585 static void __init reserve_crashkernel(void)
590 static struct resource standard_io_resources[] = {
591 { .name = "dma1", .start = 0x00, .end = 0x1f,
592 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
593 { .name = "pic1", .start = 0x20, .end = 0x21,
594 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
595 { .name = "timer0", .start = 0x40, .end = 0x43,
596 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
597 { .name = "timer1", .start = 0x50, .end = 0x53,
598 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
599 { .name = "keyboard", .start = 0x60, .end = 0x60,
600 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
601 { .name = "keyboard", .start = 0x64, .end = 0x64,
602 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
603 { .name = "dma page reg", .start = 0x80, .end = 0x8f,
604 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
605 { .name = "pic2", .start = 0xa0, .end = 0xa1,
606 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
607 { .name = "dma2", .start = 0xc0, .end = 0xdf,
608 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
609 { .name = "fpu", .start = 0xf0, .end = 0xff,
610 .flags = IORESOURCE_BUSY | IORESOURCE_IO }
613 void __init reserve_standard_io_resources(void)
617 /* request I/O space for devices used on all i[345]86 PCs */
618 for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
619 request_resource(&ioport_resource, &standard_io_resources[i]);
623 static __init void reserve_ibft_region(void)
625 unsigned long addr, size = 0;
627 addr = find_ibft_region(&size);
630 memblock_x86_reserve_range(addr, addr + size, "* ibft");
633 static unsigned reserve_low = CONFIG_X86_RESERVE_LOW << 10;
635 static bool __init snb_gfx_workaround_needed(void)
640 static const __initconst u16 snb_ids[] = {
650 /* Assume no if something weird is going on with PCI */
651 if (!early_pci_allowed())
654 vendor = read_pci_config_16(0, 2, 0, PCI_VENDOR_ID);
655 if (vendor != 0x8086)
658 devid = read_pci_config_16(0, 2, 0, PCI_DEVICE_ID);
659 for (i = 0; i < ARRAY_SIZE(snb_ids); i++)
660 if (devid == snb_ids[i])
668 * Sandy Bridge graphics has trouble with certain ranges, exclude
669 * them from allocation.
671 static void __init trim_snb_memory(void)
673 static const __initconst unsigned long bad_pages[] = {
682 if (!snb_gfx_workaround_needed())
685 printk(KERN_DEBUG "reserving inaccessible SNB gfx pages\n");
688 * Reserve all memory below the 1 MB mark that has not
689 * already been reserved.
691 memblock_reserve(0, 1<<20);
693 for (i = 0; i < ARRAY_SIZE(bad_pages); i++) {
694 if (memblock_reserve(bad_pages[i], PAGE_SIZE))
695 printk(KERN_WARNING "failed to reserve 0x%08lx\n",
701 * Here we put platform-specific memory range workarounds, i.e.
702 * memory known to be corrupt or otherwise in need to be reserved on
703 * specific platforms.
705 * If this gets used more widely it could use a real dispatch mechanism.
707 static void __init trim_platform_memory_ranges(void)
712 static void __init trim_bios_range(void)
715 * A special case is the first 4Kb of memory;
716 * This is a BIOS owned area, not kernel ram, but generally
717 * not listed as such in the E820 table.
719 * This typically reserves additional memory (64KiB by default)
720 * since some BIOSes are known to corrupt low memory. See the
721 * Kconfig help text for X86_RESERVE_LOW.
723 e820_update_range(0, ALIGN(reserve_low, PAGE_SIZE),
724 E820_RAM, E820_RESERVED);
727 * special case: Some BIOSen report the PC BIOS
728 * area (640->1Mb) as ram even though it is not.
731 e820_remove_range(BIOS_BEGIN, BIOS_END - BIOS_BEGIN, E820_RAM, 1);
733 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
736 static int __init parse_reservelow(char *p)
738 unsigned long long size;
743 size = memparse(p, &p);
756 early_param("reservelow", parse_reservelow);
759 * Determine if we were loaded by an EFI loader. If so, then we have also been
760 * passed the efi memmap, systab, etc., so we should use these data structures
761 * for initialization. Note, the efi init code path is determined by the
762 * global efi_enabled. This allows the same kernel image to be used on existing
763 * systems (with a traditional BIOS) as well as on EFI systems.
766 * setup_arch - architecture-specific boot-time initializations
768 * Note: On x86_64, fixmaps are ready for use even before this is called.
771 void __init setup_arch(char **cmdline_p)
774 memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
775 visws_early_detect();
778 * copy kernel address range established so far and switch
779 * to the proper swapper page table
781 clone_pgd_range(swapper_pg_dir + KERNEL_PGD_BOUNDARY,
782 initial_page_table + KERNEL_PGD_BOUNDARY,
785 load_cr3(swapper_pg_dir);
788 printk(KERN_INFO "Command line: %s\n", boot_command_line);
792 * If we have OLPC OFW, we might end up relocating the fixmap due to
793 * reserve_top(), so do this before touching the ioremap area.
799 early_ioremap_init();
801 setup_olpc_ofw_pgd();
803 ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
804 screen_info = boot_params.screen_info;
805 edid_info = boot_params.edid_info;
807 apm_info.bios = boot_params.apm_bios_info;
808 ist_info = boot_params.ist_info;
809 if (boot_params.sys_desc_table.length != 0) {
810 set_mca_bus(boot_params.sys_desc_table.table[3] & 0x2);
811 machine_id = boot_params.sys_desc_table.table[0];
812 machine_submodel_id = boot_params.sys_desc_table.table[1];
813 BIOS_revision = boot_params.sys_desc_table.table[2];
816 saved_video_mode = boot_params.hdr.vid_mode;
817 bootloader_type = boot_params.hdr.type_of_loader;
818 if ((bootloader_type >> 4) == 0xe) {
819 bootloader_type &= 0xf;
820 bootloader_type |= (boot_params.hdr.ext_loader_type+0x10) << 4;
822 bootloader_version = bootloader_type & 0xf;
823 bootloader_version |= boot_params.hdr.ext_loader_ver << 4;
825 #ifdef CONFIG_BLK_DEV_RAM
826 rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
827 rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
828 rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
831 if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
833 set_bit(EFI_BOOT, &x86_efi_facility);
834 } else if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
836 set_bit(EFI_BOOT, &x86_efi_facility);
837 set_bit(EFI_64BIT, &x86_efi_facility);
840 if (efi_enabled(EFI_BOOT))
841 efi_memblock_x86_reserve_range();
844 x86_init.oem.arch_setup();
846 iomem_resource.end = (1ULL << boot_cpu_data.x86_phys_bits) - 1;
849 /* update the e820_saved too */
850 e820_reserve_setup_data();
854 if (!boot_params.hdr.root_flags)
855 root_mountflags &= ~MS_RDONLY;
856 init_mm.start_code = (unsigned long) _text;
857 init_mm.end_code = (unsigned long) _etext;
858 init_mm.end_data = (unsigned long) _edata;
859 init_mm.brk = _brk_end;
861 code_resource.start = virt_to_phys(_text);
862 code_resource.end = virt_to_phys(_etext)-1;
863 data_resource.start = virt_to_phys(_etext);
864 data_resource.end = virt_to_phys(_edata)-1;
865 bss_resource.start = virt_to_phys(&__bss_start);
866 bss_resource.end = virt_to_phys(&__bss_stop)-1;
868 #ifdef CONFIG_CMDLINE_BOOL
869 #ifdef CONFIG_CMDLINE_OVERRIDE
870 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
872 if (builtin_cmdline[0]) {
873 /* append boot loader cmdline to builtin */
874 strlcat(builtin_cmdline, " ", COMMAND_LINE_SIZE);
875 strlcat(builtin_cmdline, boot_command_line, COMMAND_LINE_SIZE);
876 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
881 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
882 *cmdline_p = command_line;
885 * x86_configure_nx() is called before parse_early_param() to detect
886 * whether hardware doesn't support NX (so that the early EHCI debug
887 * console setup can safely call set_fixmap()). It may then be called
888 * again from within noexec_setup() during parsing early parameters
889 * to honor the respective command line option.
897 /* after early param, so could get panic from serial */
898 memblock_x86_reserve_range_setup_data();
900 if (acpi_mps_check()) {
901 #ifdef CONFIG_X86_LOCAL_APIC
904 setup_clear_cpu_cap(X86_FEATURE_APIC);
908 if (pci_early_dump_regs)
909 early_dump_pci_devices();
912 finish_e820_parsing();
914 if (efi_enabled(EFI_BOOT))
920 * VMware detection requires dmi to be available, so this
921 * needs to be done after dmi_scan_machine, for the BP.
923 init_hypervisor_platform();
926 * This needs to happen right after XENPV is set on xen and
927 * kaiser_enabled is checked below in cleanup_highmap().
929 kaiser_check_boottime_disable();
931 x86_init.resources.probe_roms();
933 /* after parse_early_param, so could debug it */
934 insert_resource(&iomem_resource, &code_resource);
935 insert_resource(&iomem_resource, &data_resource);
936 insert_resource(&iomem_resource, &bss_resource);
940 if (ppro_with_ram_bug()) {
941 e820_update_range(0x70000000ULL, 0x40000ULL, E820_RAM,
943 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
944 printk(KERN_INFO "fixed physical RAM map:\n");
945 e820_print_map("bad_ppro");
948 early_gart_iommu_check();
952 * partially used pages are not usable - thus
953 * we are rounding upwards:
955 max_pfn = e820_end_of_ram_pfn();
957 /* update e820 for memory not covered by WB MTRRs */
959 if (mtrr_trim_uncached_memory(max_pfn))
960 max_pfn = e820_end_of_ram_pfn();
963 /* max_low_pfn get updated here */
964 find_low_pfn_range();
966 num_physpages = max_pfn;
970 /* How many end-of-memory variables you have, grandma! */
971 /* need this before calling reserve_initrd */
972 if (max_pfn > (1UL<<(32 - PAGE_SHIFT)))
973 max_low_pfn = e820_end_of_low_ram_pfn();
975 max_low_pfn = max_pfn;
977 high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
981 * Find and reserve possible boot-time SMP configuration:
985 reserve_ibft_region();
988 * Need to conclude brk, before memblock_x86_fill()
989 * it could use memblock_find_in_range, could overlap with
996 memblock.current_limit = get_max_mapped();
1000 * The EFI specification says that boot service code won't be called
1001 * after ExitBootServices(). This is, in fact, a lie.
1003 if (efi_enabled(EFI_MEMMAP))
1004 efi_reserve_boot_services();
1006 /* preallocate 4k for mptable mpc */
1007 early_reserve_e820_mpc_new();
1009 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
1010 setup_bios_corruption_check();
1013 printk(KERN_DEBUG "initial memory mapped : 0 - %08lx\n",
1014 max_pfn_mapped<<PAGE_SHIFT);
1016 setup_trampolines();
1018 trim_platform_memory_ranges();
1022 /* max_pfn_mapped is updated here */
1023 max_low_pfn_mapped = init_memory_mapping(0, max_low_pfn<<PAGE_SHIFT);
1024 max_pfn_mapped = max_low_pfn_mapped;
1026 #ifdef CONFIG_X86_64
1027 if (max_pfn > max_low_pfn) {
1029 for (i = 0; i < e820.nr_map; i++) {
1030 struct e820entry *ei = &e820.map[i];
1032 if (ei->addr + ei->size <= 1UL << 32)
1035 if (ei->type == E820_RESERVED)
1038 max_pfn_mapped = init_memory_mapping(
1039 ei->addr < 1UL << 32 ? 1UL << 32 : ei->addr,
1040 ei->addr + ei->size);
1043 /* can we preseve max_low_pfn ?*/
1044 max_low_pfn = max_pfn;
1047 memblock.current_limit = get_max_mapped();
1050 * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
1053 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
1054 if (init_ohci1394_dma_early)
1055 init_ohci1394_dma_on_all_controllers();
1057 /* Allocate bigger log buffer */
1062 reserve_crashkernel();
1069 * Parse the ACPI tables for possible boot-time SMP configuration.
1071 acpi_boot_table_init();
1073 early_acpi_boot_init();
1076 memblock_find_dma_reserve();
1078 #ifdef CONFIG_KVM_CLOCK
1082 x86_init.paging.pagetable_setup_start(swapper_pg_dir);
1084 x86_init.paging.pagetable_setup_done(swapper_pg_dir);
1086 if (boot_cpu_data.cpuid_level >= 0) {
1087 /* A CPU has %cr4 if and only if it has CPUID */
1088 mmu_cr4_features = read_cr4();
1091 #ifdef CONFIG_X86_32
1092 /* sync back kernel address range */
1093 clone_pgd_range(initial_page_table + KERNEL_PGD_BOUNDARY,
1094 swapper_pg_dir + KERNEL_PGD_BOUNDARY,
1100 #ifdef CONFIG_X86_64
1104 generic_apic_probe();
1109 * Read APIC and some other early information from ACPI tables.
1116 * get boot-time SMP configuration:
1118 if (smp_found_config)
1121 prefill_possible_map();
1125 init_apic_mappings();
1126 ioapic_and_gsi_init();
1130 e820_reserve_resources();
1131 e820_mark_nosave_regions(max_low_pfn);
1133 x86_init.resources.reserve_resources();
1138 #if defined(CONFIG_VGA_CONSOLE)
1139 if (!efi_enabled(EFI_BOOT) || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
1140 conswitchp = &vga_con;
1141 #elif defined(CONFIG_DUMMY_CONSOLE)
1142 conswitchp = &dummy_con;
1145 x86_init.oem.banner();
1147 x86_init.timers.wallclock_init();
1149 x86_platform.wallclock_init();
1153 arch_init_ideal_nops();
1156 #ifdef CONFIG_X86_32
1158 static struct resource video_ram_resource = {
1159 .name = "Video RAM area",
1162 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
1165 void __init i386_reserve_resources(void)
1167 request_resource(&iomem_resource, &video_ram_resource);
1168 reserve_standard_io_resources();
1171 #endif /* CONFIG_X86_32 */