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/crash_dump.h>
46 #include <linux/dmi.h>
47 #include <linux/pfn.h>
48 #include <linux/pci.h>
49 #include <linux/init_ohci1394_dma.h>
50 #include <linux/kvm_para.h>
52 #include <video/edid.h>
57 #include <asm/mpspec.h>
58 #include <asm/mmzone.h>
59 #include <asm/setup.h>
60 #include <asm/arch_hooks.h>
61 #include <asm/sections.h>
62 #include <asm/io_apic.h>
66 #include <setup_arch.h>
67 #include <asm/bios_ebda.h>
68 #include <asm/cacheflush.h>
69 #include <asm/processor.h>
71 /* This value is set up by the early boot code to point to the value
72 immediately after the boot time page tables. It contains a *physical*
73 address, and must not be in the .bss segment! */
74 unsigned long init_pg_tables_end __initdata = ~0UL;
79 static struct resource data_resource = {
80 .name = "Kernel data",
83 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
86 static struct resource code_resource = {
87 .name = "Kernel code",
90 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
93 static struct resource bss_resource = {
97 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
100 static struct resource video_ram_resource = {
101 .name = "Video RAM area",
104 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
107 static struct resource standard_io_resources[] = { {
111 .flags = IORESOURCE_BUSY | IORESOURCE_IO
116 .flags = IORESOURCE_BUSY | IORESOURCE_IO
121 .flags = IORESOURCE_BUSY | IORESOURCE_IO
126 .flags = IORESOURCE_BUSY | IORESOURCE_IO
131 .flags = IORESOURCE_BUSY | IORESOURCE_IO
133 .name = "dma page reg",
136 .flags = IORESOURCE_BUSY | IORESOURCE_IO
141 .flags = IORESOURCE_BUSY | IORESOURCE_IO
146 .flags = IORESOURCE_BUSY | IORESOURCE_IO
151 .flags = IORESOURCE_BUSY | IORESOURCE_IO
154 /* cpu data as detected by the assembly code in head.S */
155 struct cpuinfo_x86 new_cpu_data __cpuinitdata = { 0, 0, 0, 0, -1, 1, 0, 0, -1 };
156 /* common cpu data for all cpus */
157 struct cpuinfo_x86 boot_cpu_data __read_mostly = { 0, 0, 0, 0, -1, 1, 0, 0, -1 };
158 EXPORT_SYMBOL(boot_cpu_data);
160 unsigned int def_to_bigsmp;
162 #ifndef CONFIG_X86_PAE
163 unsigned long mmu_cr4_features;
165 unsigned long mmu_cr4_features = X86_CR4_PAE;
168 /* for MCA, but anyone else can use it if they want */
169 unsigned int machine_id;
170 unsigned int machine_submodel_id;
171 unsigned int BIOS_revision;
173 /* Boot loader ID as an integer, for the benefit of proc_dointvec */
176 /* user-defined highmem size */
177 static unsigned int highmem_pages = -1;
182 struct screen_info screen_info;
183 EXPORT_SYMBOL(screen_info);
184 struct apm_info apm_info;
185 EXPORT_SYMBOL(apm_info);
186 struct edid_info edid_info;
187 EXPORT_SYMBOL_GPL(edid_info);
188 struct ist_info ist_info;
189 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
190 defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
191 EXPORT_SYMBOL(ist_info);
194 extern void early_cpu_init(void);
195 extern int root_mountflags;
197 unsigned long saved_video_mode;
199 #define RAMDISK_IMAGE_START_MASK 0x07FF
200 #define RAMDISK_PROMPT_FLAG 0x8000
201 #define RAMDISK_LOAD_FLAG 0x4000
203 static char __initdata command_line[COMMAND_LINE_SIZE];
205 #ifndef CONFIG_DEBUG_BOOT_PARAMS
206 struct boot_params __initdata boot_params;
208 struct boot_params boot_params;
211 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
213 #ifdef CONFIG_EDD_MODULE
217 * copy_edd() - Copy the BIOS EDD information
218 * from boot_params into a safe place.
221 static inline void copy_edd(void)
223 memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer,
224 sizeof(edd.mbr_signature));
225 memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
226 edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
227 edd.edd_info_nr = boot_params.eddbuf_entries;
230 static inline void copy_edd(void)
235 int __initdata user_defined_memmap;
238 * "mem=nopentium" disables the 4MB page tables.
239 * "mem=XXX[kKmM]" defines a memory region from HIGH_MEM
240 * to <mem>, overriding the bios size.
241 * "memmap=XXX[KkmM]@XXX[KkmM]" defines a memory region from
242 * <start> to <start>+<mem>, overriding the bios size.
244 * HPA tells me bootloaders need to parse mem=, so no new
245 * option should be mem= [also see Documentation/i386/boot.txt]
247 static int __init parse_mem(char *arg)
252 if (strcmp(arg, "nopentium") == 0) {
253 setup_clear_cpu_cap(X86_FEATURE_PSE);
255 /* If the user specifies memory size, we
256 * limit the BIOS-provided memory map to
257 * that size. exactmap can be used to specify
258 * the exact map. mem=number can be used to
259 * trim the existing memory map.
261 unsigned long long mem_size;
263 mem_size = memparse(arg, &arg);
264 limit_regions(mem_size);
265 user_defined_memmap = 1;
269 early_param("mem", parse_mem);
271 #ifdef CONFIG_PROC_VMCORE
272 /* elfcorehdr= specifies the location of elf core header
273 * stored by the crashed kernel.
275 static int __init parse_elfcorehdr(char *arg)
280 elfcorehdr_addr = memparse(arg, &arg);
283 early_param("elfcorehdr", parse_elfcorehdr);
284 #endif /* CONFIG_PROC_VMCORE */
287 * highmem=size forces highmem to be exactly 'size' bytes.
288 * This works even on boxes that have no highmem otherwise.
289 * This also works to reduce highmem size on bigger boxes.
291 static int __init parse_highmem(char *arg)
296 highmem_pages = memparse(arg, &arg) >> PAGE_SHIFT;
299 early_param("highmem", parse_highmem);
302 * vmalloc=size forces the vmalloc area to be exactly 'size'
303 * bytes. This can be used to increase (or decrease) the
304 * vmalloc area - the default is 128m.
306 static int __init parse_vmalloc(char *arg)
311 __VMALLOC_RESERVE = memparse(arg, &arg);
314 early_param("vmalloc", parse_vmalloc);
317 * reservetop=size reserves a hole at the top of the kernel address space which
318 * a hypervisor can load into later. Needed for dynamically loaded hypervisors,
319 * so relocating the fixmap can be done before paging initialization.
321 static int __init parse_reservetop(char *arg)
323 unsigned long address;
328 address = memparse(arg, &arg);
329 reserve_top_address(address);
332 early_param("reservetop", parse_reservetop);
335 * Determine low and high memory ranges:
337 unsigned long __init find_max_low_pfn(void)
339 unsigned long max_low_pfn;
341 max_low_pfn = max_pfn;
342 if (max_low_pfn > MAXMEM_PFN) {
343 if (highmem_pages == -1)
344 highmem_pages = max_pfn - MAXMEM_PFN;
345 if (highmem_pages + MAXMEM_PFN < max_pfn)
346 max_pfn = MAXMEM_PFN + highmem_pages;
347 if (highmem_pages + MAXMEM_PFN > max_pfn) {
348 printk("only %luMB highmem pages available, ignoring highmem size of %uMB.\n", pages_to_mb(max_pfn - MAXMEM_PFN), pages_to_mb(highmem_pages));
351 max_low_pfn = MAXMEM_PFN;
352 #ifndef CONFIG_HIGHMEM
353 /* Maximum memory usable is what is directly addressable */
354 printk(KERN_WARNING "Warning only %ldMB will be used.\n",
356 if (max_pfn > MAX_NONPAE_PFN)
357 printk(KERN_WARNING "Use a HIGHMEM64G enabled kernel.\n");
359 printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n");
360 max_pfn = MAXMEM_PFN;
361 #else /* !CONFIG_HIGHMEM */
362 #ifndef CONFIG_HIGHMEM64G
363 if (max_pfn > MAX_NONPAE_PFN) {
364 max_pfn = MAX_NONPAE_PFN;
365 printk(KERN_WARNING "Warning only 4GB will be used.\n");
366 printk(KERN_WARNING "Use a HIGHMEM64G enabled kernel.\n");
368 #endif /* !CONFIG_HIGHMEM64G */
369 #endif /* !CONFIG_HIGHMEM */
371 if (highmem_pages == -1)
373 #ifdef CONFIG_HIGHMEM
374 if (highmem_pages >= max_pfn) {
375 printk(KERN_ERR "highmem size specified (%uMB) is bigger than pages available (%luMB)!.\n", pages_to_mb(highmem_pages), pages_to_mb(max_pfn));
379 if (max_low_pfn-highmem_pages < 64*1024*1024/PAGE_SIZE){
380 printk(KERN_ERR "highmem size %uMB results in smaller than 64MB lowmem, ignoring it.\n", pages_to_mb(highmem_pages));
383 max_low_pfn -= highmem_pages;
387 printk(KERN_ERR "ignoring highmem size on non-highmem kernel!\n");
393 #define BIOS_LOWMEM_KILOBYTES 0x413
396 * The BIOS places the EBDA/XBDA at the top of conventional
397 * memory, and usually decreases the reported amount of
398 * conventional memory (int 0x12) too. This also contains a
399 * workaround for Dell systems that neglect to reserve EBDA.
400 * The same workaround also avoids a problem with the AMD768MPX
401 * chipset: reserve a page before VGA to prevent PCI prefetch
402 * into it (errata #56). Usually the page is reserved anyways,
403 * unless you have no PS/2 mouse plugged in.
405 static void __init reserve_ebda_region(void)
407 unsigned int lowmem, ebda_addr;
409 /* To determine the position of the EBDA and the */
410 /* end of conventional memory, we need to look at */
411 /* the BIOS data area. In a paravirtual environment */
412 /* that area is absent. We'll just have to assume */
413 /* that the paravirt case can handle memory setup */
414 /* correctly, without our help. */
415 if (paravirt_enabled())
418 /* end of low (conventional) memory */
419 lowmem = *(unsigned short *)__va(BIOS_LOWMEM_KILOBYTES);
422 /* start of EBDA area */
423 ebda_addr = get_bios_ebda();
425 /* Fixup: bios puts an EBDA in the top 64K segment */
426 /* of conventional memory, but does not adjust lowmem. */
427 if ((lowmem - ebda_addr) <= 0x10000)
430 /* Fixup: bios does not report an EBDA at all. */
431 /* Some old Dells seem to need 4k anyhow (bugzilla 2990) */
432 if ((ebda_addr == 0) && (lowmem >= 0x9f000))
435 /* Paranoia: should never happen, but... */
436 if ((lowmem == 0) || (lowmem >= 0x100000))
439 /* reserve all memory between lowmem and the 1MB mark */
440 reserve_bootmem(lowmem, 0x100000 - lowmem, BOOTMEM_DEFAULT);
443 #ifndef CONFIG_NEED_MULTIPLE_NODES
444 static void __init setup_bootmem_allocator(void);
445 static unsigned long __init setup_memory(void)
448 * partially used pages are not usable - thus
449 * we are rounding upwards:
451 min_low_pfn = PFN_UP(init_pg_tables_end);
453 max_low_pfn = find_max_low_pfn();
455 #ifdef CONFIG_HIGHMEM
456 highstart_pfn = highend_pfn = max_pfn;
457 if (max_pfn > max_low_pfn) {
458 highstart_pfn = max_low_pfn;
460 printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
461 pages_to_mb(highend_pfn - highstart_pfn));
462 num_physpages = highend_pfn;
463 high_memory = (void *) __va(highstart_pfn * PAGE_SIZE - 1) + 1;
465 num_physpages = max_low_pfn;
466 high_memory = (void *) __va(max_low_pfn * PAGE_SIZE - 1) + 1;
468 #ifdef CONFIG_FLATMEM
469 max_mapnr = num_physpages;
471 printk(KERN_NOTICE "%ldMB LOWMEM available.\n",
472 pages_to_mb(max_low_pfn));
474 setup_bootmem_allocator();
479 static void __init zone_sizes_init(void)
481 unsigned long max_zone_pfns[MAX_NR_ZONES];
482 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
483 max_zone_pfns[ZONE_DMA] =
484 virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
485 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
486 #ifdef CONFIG_HIGHMEM
487 max_zone_pfns[ZONE_HIGHMEM] = highend_pfn;
488 add_active_range(0, 0, highend_pfn);
490 add_active_range(0, 0, max_low_pfn);
493 free_area_init_nodes(max_zone_pfns);
496 extern unsigned long __init setup_memory(void);
497 extern void zone_sizes_init(void);
498 #endif /* !CONFIG_NEED_MULTIPLE_NODES */
500 static inline unsigned long long get_total_mem(void)
502 unsigned long long total;
504 total = max_low_pfn - min_low_pfn;
505 #ifdef CONFIG_HIGHMEM
506 total += highend_pfn - highstart_pfn;
509 return total << PAGE_SHIFT;
513 static void __init reserve_crashkernel(void)
515 unsigned long long total_mem;
516 unsigned long long crash_size, crash_base;
519 total_mem = get_total_mem();
521 ret = parse_crashkernel(boot_command_line, total_mem,
522 &crash_size, &crash_base);
523 if (ret == 0 && crash_size > 0) {
524 if (crash_base > 0) {
525 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
526 "for crashkernel (System RAM: %ldMB)\n",
527 (unsigned long)(crash_size >> 20),
528 (unsigned long)(crash_base >> 20),
529 (unsigned long)(total_mem >> 20));
530 crashk_res.start = crash_base;
531 crashk_res.end = crash_base + crash_size - 1;
532 reserve_bootmem(crash_base, crash_size,
535 printk(KERN_INFO "crashkernel reservation failed - "
536 "you have to specify a base address\n");
540 static inline void __init reserve_crashkernel(void)
544 #ifdef CONFIG_BLK_DEV_INITRD
546 static bool do_relocate_initrd = false;
548 static void __init reserve_initrd(void)
550 unsigned long ramdisk_image = boot_params.hdr.ramdisk_image;
551 unsigned long ramdisk_size = boot_params.hdr.ramdisk_size;
552 unsigned long ramdisk_end = ramdisk_image + ramdisk_size;
553 unsigned long end_of_lowmem = max_low_pfn << PAGE_SHIFT;
554 unsigned long ramdisk_here;
558 if (!boot_params.hdr.type_of_loader ||
559 !ramdisk_image || !ramdisk_size)
560 return; /* No initrd provided by bootloader */
562 if (ramdisk_end < ramdisk_image) {
563 printk(KERN_ERR "initrd wraps around end of memory, "
564 "disabling initrd\n");
567 if (ramdisk_size >= end_of_lowmem/2) {
568 printk(KERN_ERR "initrd too large to handle, "
569 "disabling initrd\n");
572 if (ramdisk_end <= end_of_lowmem) {
573 /* All in lowmem, easy case */
574 reserve_bootmem(ramdisk_image, ramdisk_size, BOOTMEM_DEFAULT);
575 initrd_start = ramdisk_image + PAGE_OFFSET;
576 initrd_end = initrd_start+ramdisk_size;
580 /* We need to move the initrd down into lowmem */
581 ramdisk_here = (end_of_lowmem - ramdisk_size) & PAGE_MASK;
583 /* Note: this includes all the lowmem currently occupied by
584 the initrd, we rely on that fact to keep the data intact. */
585 reserve_bootmem(ramdisk_here, ramdisk_size, BOOTMEM_DEFAULT);
586 initrd_start = ramdisk_here + PAGE_OFFSET;
587 initrd_end = initrd_start + ramdisk_size;
589 do_relocate_initrd = true;
592 #define MAX_MAP_CHUNK (NR_FIX_BTMAPS << PAGE_SHIFT)
594 static void __init relocate_initrd(void)
596 unsigned long ramdisk_image = boot_params.hdr.ramdisk_image;
597 unsigned long ramdisk_size = boot_params.hdr.ramdisk_size;
598 unsigned long end_of_lowmem = max_low_pfn << PAGE_SHIFT;
599 unsigned long ramdisk_here;
600 unsigned long slop, clen, mapaddr;
603 if (!do_relocate_initrd)
606 ramdisk_here = initrd_start - PAGE_OFFSET;
608 q = (char *)initrd_start;
610 /* Copy any lowmem portion of the initrd */
611 if (ramdisk_image < end_of_lowmem) {
612 clen = end_of_lowmem - ramdisk_image;
613 p = (char *)__va(ramdisk_image);
616 ramdisk_image += clen;
617 ramdisk_size -= clen;
620 /* Copy the highmem portion of the initrd */
621 while (ramdisk_size) {
622 slop = ramdisk_image & ~PAGE_MASK;
624 if (clen > MAX_MAP_CHUNK-slop)
625 clen = MAX_MAP_CHUNK-slop;
626 mapaddr = ramdisk_image & PAGE_MASK;
627 p = early_ioremap(mapaddr, clen+slop);
628 memcpy(q, p+slop, clen);
629 early_iounmap(p, clen+slop);
631 ramdisk_image += clen;
632 ramdisk_size -= clen;
636 #endif /* CONFIG_BLK_DEV_INITRD */
638 void __init setup_bootmem_allocator(void)
640 unsigned long bootmap_size;
642 * Initialize the boot-time allocator (with low memory only):
644 bootmap_size = init_bootmem(min_low_pfn, max_low_pfn);
646 register_bootmem_low_pages(max_low_pfn);
649 * Reserve the bootmem bitmap itself as well. We do this in two
650 * steps (first step was init_bootmem()) because this catches
651 * the (very unlikely) case of us accidentally initializing the
652 * bootmem allocator with an invalid RAM area.
654 reserve_bootmem(__pa_symbol(_text), (PFN_PHYS(min_low_pfn) +
655 bootmap_size + PAGE_SIZE-1) - __pa_symbol(_text),
659 * reserve physical page 0 - it's a special BIOS page on many boxes,
660 * enabling clean reboots, SMP operation, laptop functions.
662 reserve_bootmem(0, PAGE_SIZE, BOOTMEM_DEFAULT);
664 /* reserve EBDA region */
665 reserve_ebda_region();
669 * But first pinch a few for the stack/trampoline stuff
670 * FIXME: Don't need the extra page at 4K, but need to fix
671 * trampoline before removing it. (see the GDT stuff)
673 reserve_bootmem(PAGE_SIZE, PAGE_SIZE, BOOTMEM_DEFAULT);
675 #ifdef CONFIG_ACPI_SLEEP
677 * Reserve low memory region for sleep support.
679 acpi_reserve_bootmem();
681 #ifdef CONFIG_X86_FIND_SMP_CONFIG
683 * Find and reserve possible boot-time SMP configuration:
687 #ifdef CONFIG_BLK_DEV_INITRD
691 reserve_crashkernel();
693 reserve_ibft_region();
697 * The node 0 pgdat is initialized before all of these because
698 * it's needed for bootmem. node>0 pgdats have their virtual
699 * space allocated before the pagetables are in place to access
700 * them, so they can't be cleared then.
702 * This should all compile down to nothing when NUMA is off.
704 static void __init remapped_pgdat_init(void)
708 for_each_online_node(nid) {
710 memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
715 static void set_mca_bus(int x)
720 static void set_mca_bus(int x) { }
723 /* Overridden in paravirt.c if CONFIG_PARAVIRT */
724 char * __init __attribute__((weak)) memory_setup(void)
726 return machine_specific_memory_setup();
731 * In the golden day, when everything among i386 and x86_64 will be
732 * integrated, this will not live here
734 void *x86_cpu_to_node_map_early_ptr;
735 int x86_cpu_to_node_map_init[NR_CPUS] = {
736 [0 ... NR_CPUS-1] = NUMA_NO_NODE
738 DEFINE_PER_CPU(int, x86_cpu_to_node_map) = NUMA_NO_NODE;
742 * Determine if we were loaded by an EFI loader. If so, then we have also been
743 * passed the efi memmap, systab, etc., so we should use these data structures
744 * for initialization. Note, the efi init code path is determined by the
745 * global efi_enabled. This allows the same kernel image to be used on existing
746 * systems (with a traditional BIOS) as well as on EFI systems.
748 void __init setup_arch(char **cmdline_p)
750 unsigned long max_low_pfn;
752 memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
753 pre_setup_arch_hook();
755 early_ioremap_init();
758 if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
763 ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
764 screen_info = boot_params.screen_info;
765 edid_info = boot_params.edid_info;
766 apm_info.bios = boot_params.apm_bios_info;
767 ist_info = boot_params.ist_info;
768 saved_video_mode = boot_params.hdr.vid_mode;
769 if( boot_params.sys_desc_table.length != 0 ) {
770 set_mca_bus(boot_params.sys_desc_table.table[3] & 0x2);
771 machine_id = boot_params.sys_desc_table.table[0];
772 machine_submodel_id = boot_params.sys_desc_table.table[1];
773 BIOS_revision = boot_params.sys_desc_table.table[2];
775 bootloader_type = boot_params.hdr.type_of_loader;
777 #ifdef CONFIG_BLK_DEV_RAM
778 rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
779 rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
780 rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
784 printk(KERN_INFO "BIOS-provided physical RAM map:\n");
785 print_memory_map(memory_setup());
789 if (!boot_params.hdr.root_flags)
790 root_mountflags &= ~MS_RDONLY;
791 init_mm.start_code = (unsigned long) _text;
792 init_mm.end_code = (unsigned long) _etext;
793 init_mm.end_data = (unsigned long) _edata;
794 init_mm.brk = init_pg_tables_end + PAGE_OFFSET;
796 code_resource.start = virt_to_phys(_text);
797 code_resource.end = virt_to_phys(_etext)-1;
798 data_resource.start = virt_to_phys(_etext);
799 data_resource.end = virt_to_phys(_edata)-1;
800 bss_resource.start = virt_to_phys(&__bss_start);
801 bss_resource.end = virt_to_phys(&__bss_stop)-1;
805 if (user_defined_memmap) {
806 printk(KERN_INFO "user-defined physical RAM map:\n");
807 print_memory_map("user");
810 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
811 *cmdline_p = command_line;
816 /* update e820 for memory not covered by WB MTRRs */
817 propagate_e820_map();
819 if (mtrr_trim_uncached_memory(max_pfn))
820 propagate_e820_map();
822 max_low_pfn = setup_memory();
824 #ifdef CONFIG_KVM_CLOCK
830 * Must be after max_low_pfn is determined, and before kernel
831 * pagetables are setup.
838 * NOTE: before this point _nobody_ is allowed to allocate
839 * any memory using the bootmem allocator. Although the
840 * allocator is now initialised only the first 8Mb of the kernel
841 * virtual address space has been mapped. All allocations before
842 * paging_init() has completed must use the alloc_bootmem_low_pages()
843 * variant (which allocates DMA'able memory) and care must be taken
844 * not to exceed the 8Mb limit.
848 smp_alloc_memory(); /* AP processor realmode stacks in low memory*/
853 * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
856 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
857 if (init_ohci1394_dma_early)
858 init_ohci1394_dma_on_all_controllers();
861 remapped_pgdat_init();
866 * NOTE: at this point the bootmem allocator is fully available.
869 #ifdef CONFIG_BLK_DEV_INITRD
873 paravirt_post_allocator_init();
879 #ifdef CONFIG_X86_SMP
881 * setup to use the early static init tables during kernel startup
882 * X86_SMP will exclude sub-arches that don't deal well with it.
884 x86_cpu_to_apicid_early_ptr = (void *)x86_cpu_to_apicid_init;
885 x86_bios_cpu_apicid_early_ptr = (void *)x86_bios_cpu_apicid_init;
887 x86_cpu_to_node_map_early_ptr = (void *)x86_cpu_to_node_map_init;
891 #ifdef CONFIG_X86_GENERICARCH
892 generic_apic_probe();
897 * Parse the ACPI tables for possible boot-time SMP configuration.
899 acpi_boot_table_init();
907 #if defined(CONFIG_SMP) && defined(CONFIG_X86_PC)
909 printk(KERN_WARNING "More than 8 CPUs detected and "
910 "CONFIG_X86_PC cannot handle it.\nUse "
911 "CONFIG_X86_GENERICARCH or CONFIG_X86_BIGSMP.\n");
914 #ifdef CONFIG_X86_LOCAL_APIC
915 if (smp_found_config)
919 e820_register_memory();
920 e820_mark_nosave_regions();
923 #if defined(CONFIG_VGA_CONSOLE)
924 if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
925 conswitchp = &vga_con;
926 #elif defined(CONFIG_DUMMY_CONSOLE)
927 conswitchp = &dummy_con;
933 * Request address space for all standard resources
935 * This is called just before pcibios_init(), which is also a
936 * subsys_initcall, but is linked in later (in arch/i386/pci/common.c).
938 static int __init request_standard_resources(void)
942 printk(KERN_INFO "Setting up standard PCI resources\n");
943 init_iomem_resources(&code_resource, &data_resource, &bss_resource);
945 request_resource(&iomem_resource, &video_ram_resource);
947 /* request I/O space for devices used on all i[345]86 PCs */
948 for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
949 request_resource(&ioport_resource, &standard_io_resources[i]);
953 subsys_initcall(request_standard_resources);