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
136 .flags = IORESOURCE_BUSY | IORESOURCE_IO
138 .name = "dma page reg",
141 .flags = IORESOURCE_BUSY | IORESOURCE_IO
146 .flags = IORESOURCE_BUSY | IORESOURCE_IO
151 .flags = IORESOURCE_BUSY | IORESOURCE_IO
156 .flags = IORESOURCE_BUSY | IORESOURCE_IO
159 /* cpu data as detected by the assembly code in head.S */
160 struct cpuinfo_x86 new_cpu_data __cpuinitdata = { 0, 0, 0, 0, -1, 1, 0, 0, -1 };
161 /* common cpu data for all cpus */
162 struct cpuinfo_x86 boot_cpu_data __read_mostly = { 0, 0, 0, 0, -1, 1, 0, 0, -1 };
163 EXPORT_SYMBOL(boot_cpu_data);
165 unsigned int def_to_bigsmp;
167 #ifndef CONFIG_X86_PAE
168 unsigned long mmu_cr4_features;
170 unsigned long mmu_cr4_features = X86_CR4_PAE;
173 /* for MCA, but anyone else can use it if they want */
174 unsigned int machine_id;
175 unsigned int machine_submodel_id;
176 unsigned int BIOS_revision;
178 /* Boot loader ID as an integer, for the benefit of proc_dointvec */
181 /* user-defined highmem size */
182 static unsigned int highmem_pages = -1;
187 struct screen_info screen_info;
188 EXPORT_SYMBOL(screen_info);
189 struct apm_info apm_info;
190 EXPORT_SYMBOL(apm_info);
191 struct edid_info edid_info;
192 EXPORT_SYMBOL_GPL(edid_info);
193 struct ist_info ist_info;
194 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
195 defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
196 EXPORT_SYMBOL(ist_info);
199 extern void early_cpu_init(void);
200 extern int root_mountflags;
202 unsigned long saved_video_mode;
204 #define RAMDISK_IMAGE_START_MASK 0x07FF
205 #define RAMDISK_PROMPT_FLAG 0x8000
206 #define RAMDISK_LOAD_FLAG 0x4000
208 static char __initdata command_line[COMMAND_LINE_SIZE];
210 #ifndef CONFIG_DEBUG_BOOT_PARAMS
211 struct boot_params __initdata boot_params;
213 struct boot_params boot_params;
216 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
218 #ifdef CONFIG_EDD_MODULE
222 * copy_edd() - Copy the BIOS EDD information
223 * from boot_params into a safe place.
226 static inline void copy_edd(void)
228 memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer,
229 sizeof(edd.mbr_signature));
230 memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
231 edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
232 edd.edd_info_nr = boot_params.eddbuf_entries;
235 static inline void copy_edd(void)
240 int __initdata user_defined_memmap;
243 * "mem=nopentium" disables the 4MB page tables.
244 * "mem=XXX[kKmM]" defines a memory region from HIGH_MEM
245 * to <mem>, overriding the bios size.
246 * "memmap=XXX[KkmM]@XXX[KkmM]" defines a memory region from
247 * <start> to <start>+<mem>, overriding the bios size.
249 * HPA tells me bootloaders need to parse mem=, so no new
250 * option should be mem= [also see Documentation/i386/boot.txt]
252 static int __init parse_mem(char *arg)
257 if (strcmp(arg, "nopentium") == 0) {
258 setup_clear_cpu_cap(X86_FEATURE_PSE);
260 /* If the user specifies memory size, we
261 * limit the BIOS-provided memory map to
262 * that size. exactmap can be used to specify
263 * the exact map. mem=number can be used to
264 * trim the existing memory map.
266 unsigned long long mem_size;
268 mem_size = memparse(arg, &arg);
269 limit_regions(mem_size);
270 user_defined_memmap = 1;
274 early_param("mem", parse_mem);
276 #ifdef CONFIG_PROC_VMCORE
277 /* elfcorehdr= specifies the location of elf core header
278 * stored by the crashed kernel.
280 static int __init parse_elfcorehdr(char *arg)
285 elfcorehdr_addr = memparse(arg, &arg);
288 early_param("elfcorehdr", parse_elfcorehdr);
289 #endif /* CONFIG_PROC_VMCORE */
292 * highmem=size forces highmem to be exactly 'size' bytes.
293 * This works even on boxes that have no highmem otherwise.
294 * This also works to reduce highmem size on bigger boxes.
296 static int __init parse_highmem(char *arg)
301 highmem_pages = memparse(arg, &arg) >> PAGE_SHIFT;
304 early_param("highmem", parse_highmem);
307 * vmalloc=size forces the vmalloc area to be exactly 'size'
308 * bytes. This can be used to increase (or decrease) the
309 * vmalloc area - the default is 128m.
311 static int __init parse_vmalloc(char *arg)
316 __VMALLOC_RESERVE = memparse(arg, &arg);
319 early_param("vmalloc", parse_vmalloc);
322 * reservetop=size reserves a hole at the top of the kernel address space which
323 * a hypervisor can load into later. Needed for dynamically loaded hypervisors,
324 * so relocating the fixmap can be done before paging initialization.
326 static int __init parse_reservetop(char *arg)
328 unsigned long address;
333 address = memparse(arg, &arg);
334 reserve_top_address(address);
337 early_param("reservetop", parse_reservetop);
340 * Determine low and high memory ranges:
342 unsigned long __init find_max_low_pfn(void)
344 unsigned long max_low_pfn;
346 max_low_pfn = max_pfn;
347 if (max_low_pfn > MAXMEM_PFN) {
348 if (highmem_pages == -1)
349 highmem_pages = max_pfn - MAXMEM_PFN;
350 if (highmem_pages + MAXMEM_PFN < max_pfn)
351 max_pfn = MAXMEM_PFN + highmem_pages;
352 if (highmem_pages + MAXMEM_PFN > max_pfn) {
353 printk("only %luMB highmem pages available, ignoring highmem size of %uMB.\n", pages_to_mb(max_pfn - MAXMEM_PFN), pages_to_mb(highmem_pages));
356 max_low_pfn = MAXMEM_PFN;
357 #ifndef CONFIG_HIGHMEM
358 /* Maximum memory usable is what is directly addressable */
359 printk(KERN_WARNING "Warning only %ldMB will be used.\n",
361 if (max_pfn > MAX_NONPAE_PFN)
362 printk(KERN_WARNING "Use a HIGHMEM64G enabled kernel.\n");
364 printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n");
365 max_pfn = MAXMEM_PFN;
366 #else /* !CONFIG_HIGHMEM */
367 #ifndef CONFIG_HIGHMEM64G
368 if (max_pfn > MAX_NONPAE_PFN) {
369 max_pfn = MAX_NONPAE_PFN;
370 printk(KERN_WARNING "Warning only 4GB will be used.\n");
371 printk(KERN_WARNING "Use a HIGHMEM64G enabled kernel.\n");
373 #endif /* !CONFIG_HIGHMEM64G */
374 #endif /* !CONFIG_HIGHMEM */
376 if (highmem_pages == -1)
378 #ifdef CONFIG_HIGHMEM
379 if (highmem_pages >= max_pfn) {
380 printk(KERN_ERR "highmem size specified (%uMB) is bigger than pages available (%luMB)!.\n", pages_to_mb(highmem_pages), pages_to_mb(max_pfn));
384 if (max_low_pfn-highmem_pages < 64*1024*1024/PAGE_SIZE){
385 printk(KERN_ERR "highmem size %uMB results in smaller than 64MB lowmem, ignoring it.\n", pages_to_mb(highmem_pages));
388 max_low_pfn -= highmem_pages;
392 printk(KERN_ERR "ignoring highmem size on non-highmem kernel!\n");
398 #define BIOS_LOWMEM_KILOBYTES 0x413
401 * The BIOS places the EBDA/XBDA at the top of conventional
402 * memory, and usually decreases the reported amount of
403 * conventional memory (int 0x12) too. This also contains a
404 * workaround for Dell systems that neglect to reserve EBDA.
405 * The same workaround also avoids a problem with the AMD768MPX
406 * chipset: reserve a page before VGA to prevent PCI prefetch
407 * into it (errata #56). Usually the page is reserved anyways,
408 * unless you have no PS/2 mouse plugged in.
410 static void __init reserve_ebda_region(void)
412 unsigned int lowmem, ebda_addr;
414 /* To determine the position of the EBDA and the */
415 /* end of conventional memory, we need to look at */
416 /* the BIOS data area. In a paravirtual environment */
417 /* that area is absent. We'll just have to assume */
418 /* that the paravirt case can handle memory setup */
419 /* correctly, without our help. */
420 if (paravirt_enabled())
423 /* end of low (conventional) memory */
424 lowmem = *(unsigned short *)__va(BIOS_LOWMEM_KILOBYTES);
427 /* start of EBDA area */
428 ebda_addr = get_bios_ebda();
430 /* Fixup: bios puts an EBDA in the top 64K segment */
431 /* of conventional memory, but does not adjust lowmem. */
432 if ((lowmem - ebda_addr) <= 0x10000)
435 /* Fixup: bios does not report an EBDA at all. */
436 /* Some old Dells seem to need 4k anyhow (bugzilla 2990) */
437 if ((ebda_addr == 0) && (lowmem >= 0x9f000))
440 /* Paranoia: should never happen, but... */
441 if ((lowmem == 0) || (lowmem >= 0x100000))
444 /* reserve all memory between lowmem and the 1MB mark */
445 reserve_bootmem(lowmem, 0x100000 - lowmem, BOOTMEM_DEFAULT);
448 #ifndef CONFIG_NEED_MULTIPLE_NODES
449 static void __init setup_bootmem_allocator(void);
450 static unsigned long __init setup_memory(void)
453 * partially used pages are not usable - thus
454 * we are rounding upwards:
456 min_low_pfn = PFN_UP(init_pg_tables_end);
458 max_low_pfn = find_max_low_pfn();
460 #ifdef CONFIG_HIGHMEM
461 highstart_pfn = highend_pfn = max_pfn;
462 if (max_pfn > max_low_pfn) {
463 highstart_pfn = max_low_pfn;
465 printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
466 pages_to_mb(highend_pfn - highstart_pfn));
467 num_physpages = highend_pfn;
468 high_memory = (void *) __va(highstart_pfn * PAGE_SIZE - 1) + 1;
470 num_physpages = max_low_pfn;
471 high_memory = (void *) __va(max_low_pfn * PAGE_SIZE - 1) + 1;
473 #ifdef CONFIG_FLATMEM
474 max_mapnr = num_physpages;
476 printk(KERN_NOTICE "%ldMB LOWMEM available.\n",
477 pages_to_mb(max_low_pfn));
479 setup_bootmem_allocator();
484 static void __init zone_sizes_init(void)
486 unsigned long max_zone_pfns[MAX_NR_ZONES];
487 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
488 max_zone_pfns[ZONE_DMA] =
489 virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
490 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
491 #ifdef CONFIG_HIGHMEM
492 max_zone_pfns[ZONE_HIGHMEM] = highend_pfn;
493 add_active_range(0, 0, highend_pfn);
495 add_active_range(0, 0, max_low_pfn);
498 free_area_init_nodes(max_zone_pfns);
501 extern unsigned long __init setup_memory(void);
502 extern void zone_sizes_init(void);
503 #endif /* !CONFIG_NEED_MULTIPLE_NODES */
505 static inline unsigned long long get_total_mem(void)
507 unsigned long long total;
509 total = max_low_pfn - min_low_pfn;
510 #ifdef CONFIG_HIGHMEM
511 total += highend_pfn - highstart_pfn;
514 return total << PAGE_SHIFT;
518 static void __init reserve_crashkernel(void)
520 unsigned long long total_mem;
521 unsigned long long crash_size, crash_base;
524 total_mem = get_total_mem();
526 ret = parse_crashkernel(boot_command_line, total_mem,
527 &crash_size, &crash_base);
528 if (ret == 0 && crash_size > 0) {
529 if (crash_base > 0) {
530 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
531 "for crashkernel (System RAM: %ldMB)\n",
532 (unsigned long)(crash_size >> 20),
533 (unsigned long)(crash_base >> 20),
534 (unsigned long)(total_mem >> 20));
536 if (reserve_bootmem(crash_base, crash_size,
537 BOOTMEM_EXCLUSIVE) < 0) {
538 printk(KERN_INFO "crashkernel reservation "
539 "failed - memory is in use\n");
543 crashk_res.start = crash_base;
544 crashk_res.end = crash_base + crash_size - 1;
546 printk(KERN_INFO "crashkernel reservation failed - "
547 "you have to specify a base address\n");
551 static inline void __init reserve_crashkernel(void)
555 #ifdef CONFIG_BLK_DEV_INITRD
557 static bool do_relocate_initrd = false;
559 static void __init reserve_initrd(void)
561 unsigned long ramdisk_image = boot_params.hdr.ramdisk_image;
562 unsigned long ramdisk_size = boot_params.hdr.ramdisk_size;
563 unsigned long ramdisk_end = ramdisk_image + ramdisk_size;
564 unsigned long end_of_lowmem = max_low_pfn << PAGE_SHIFT;
565 unsigned long ramdisk_here;
569 if (!boot_params.hdr.type_of_loader ||
570 !ramdisk_image || !ramdisk_size)
571 return; /* No initrd provided by bootloader */
573 if (ramdisk_end < ramdisk_image) {
574 printk(KERN_ERR "initrd wraps around end of memory, "
575 "disabling initrd\n");
578 if (ramdisk_size >= end_of_lowmem/2) {
579 printk(KERN_ERR "initrd too large to handle, "
580 "disabling initrd\n");
583 if (ramdisk_end <= end_of_lowmem) {
584 /* All in lowmem, easy case */
585 reserve_bootmem(ramdisk_image, ramdisk_size, BOOTMEM_DEFAULT);
586 initrd_start = ramdisk_image + PAGE_OFFSET;
587 initrd_end = initrd_start+ramdisk_size;
591 /* We need to move the initrd down into lowmem */
592 ramdisk_here = (end_of_lowmem - ramdisk_size) & PAGE_MASK;
594 /* Note: this includes all the lowmem currently occupied by
595 the initrd, we rely on that fact to keep the data intact. */
596 reserve_bootmem(ramdisk_here, ramdisk_size, BOOTMEM_DEFAULT);
597 initrd_start = ramdisk_here + PAGE_OFFSET;
598 initrd_end = initrd_start + ramdisk_size;
600 do_relocate_initrd = true;
603 #define MAX_MAP_CHUNK (NR_FIX_BTMAPS << PAGE_SHIFT)
605 static void __init relocate_initrd(void)
607 unsigned long ramdisk_image = boot_params.hdr.ramdisk_image;
608 unsigned long ramdisk_size = boot_params.hdr.ramdisk_size;
609 unsigned long end_of_lowmem = max_low_pfn << PAGE_SHIFT;
610 unsigned long ramdisk_here;
611 unsigned long slop, clen, mapaddr;
614 if (!do_relocate_initrd)
617 ramdisk_here = initrd_start - PAGE_OFFSET;
619 q = (char *)initrd_start;
621 /* Copy any lowmem portion of the initrd */
622 if (ramdisk_image < end_of_lowmem) {
623 clen = end_of_lowmem - ramdisk_image;
624 p = (char *)__va(ramdisk_image);
627 ramdisk_image += clen;
628 ramdisk_size -= clen;
631 /* Copy the highmem portion of the initrd */
632 while (ramdisk_size) {
633 slop = ramdisk_image & ~PAGE_MASK;
635 if (clen > MAX_MAP_CHUNK-slop)
636 clen = MAX_MAP_CHUNK-slop;
637 mapaddr = ramdisk_image & PAGE_MASK;
638 p = early_ioremap(mapaddr, clen+slop);
639 memcpy(q, p+slop, clen);
640 early_iounmap(p, clen+slop);
642 ramdisk_image += clen;
643 ramdisk_size -= clen;
647 #endif /* CONFIG_BLK_DEV_INITRD */
649 void __init setup_bootmem_allocator(void)
651 unsigned long bootmap_size;
653 * Initialize the boot-time allocator (with low memory only):
655 bootmap_size = init_bootmem(min_low_pfn, max_low_pfn);
657 register_bootmem_low_pages(max_low_pfn);
660 * Reserve the bootmem bitmap itself as well. We do this in two
661 * steps (first step was init_bootmem()) because this catches
662 * the (very unlikely) case of us accidentally initializing the
663 * bootmem allocator with an invalid RAM area.
665 reserve_bootmem(__pa_symbol(_text), (PFN_PHYS(min_low_pfn) +
666 bootmap_size + PAGE_SIZE-1) - __pa_symbol(_text),
670 * reserve physical page 0 - it's a special BIOS page on many boxes,
671 * enabling clean reboots, SMP operation, laptop functions.
673 reserve_bootmem(0, PAGE_SIZE, BOOTMEM_DEFAULT);
675 /* reserve EBDA region */
676 reserve_ebda_region();
680 * But first pinch a few for the stack/trampoline stuff
681 * FIXME: Don't need the extra page at 4K, but need to fix
682 * trampoline before removing it. (see the GDT stuff)
684 reserve_bootmem(PAGE_SIZE, PAGE_SIZE, BOOTMEM_DEFAULT);
686 #ifdef CONFIG_ACPI_SLEEP
688 * Reserve low memory region for sleep support.
690 acpi_reserve_bootmem();
692 #ifdef CONFIG_X86_FIND_SMP_CONFIG
694 * Find and reserve possible boot-time SMP configuration:
698 #ifdef CONFIG_BLK_DEV_INITRD
702 reserve_crashkernel();
704 reserve_ibft_region();
708 * The node 0 pgdat is initialized before all of these because
709 * it's needed for bootmem. node>0 pgdats have their virtual
710 * space allocated before the pagetables are in place to access
711 * them, so they can't be cleared then.
713 * This should all compile down to nothing when NUMA is off.
715 static void __init remapped_pgdat_init(void)
719 for_each_online_node(nid) {
721 memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
726 static void set_mca_bus(int x)
731 static void set_mca_bus(int x) { }
734 /* Overridden in paravirt.c if CONFIG_PARAVIRT */
735 char * __init __attribute__((weak)) memory_setup(void)
737 return machine_specific_memory_setup();
742 * In the golden day, when everything among i386 and x86_64 will be
743 * integrated, this will not live here
745 void *x86_cpu_to_node_map_early_ptr;
746 int x86_cpu_to_node_map_init[NR_CPUS] = {
747 [0 ... NR_CPUS-1] = NUMA_NO_NODE
749 DEFINE_PER_CPU(int, x86_cpu_to_node_map) = NUMA_NO_NODE;
753 * Determine if we were loaded by an EFI loader. If so, then we have also been
754 * passed the efi memmap, systab, etc., so we should use these data structures
755 * for initialization. Note, the efi init code path is determined by the
756 * global efi_enabled. This allows the same kernel image to be used on existing
757 * systems (with a traditional BIOS) as well as on EFI systems.
759 void __init setup_arch(char **cmdline_p)
761 unsigned long max_low_pfn;
763 memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
764 pre_setup_arch_hook();
766 early_ioremap_init();
769 if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
774 ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
775 screen_info = boot_params.screen_info;
776 edid_info = boot_params.edid_info;
777 apm_info.bios = boot_params.apm_bios_info;
778 ist_info = boot_params.ist_info;
779 saved_video_mode = boot_params.hdr.vid_mode;
780 if( boot_params.sys_desc_table.length != 0 ) {
781 set_mca_bus(boot_params.sys_desc_table.table[3] & 0x2);
782 machine_id = boot_params.sys_desc_table.table[0];
783 machine_submodel_id = boot_params.sys_desc_table.table[1];
784 BIOS_revision = boot_params.sys_desc_table.table[2];
786 bootloader_type = boot_params.hdr.type_of_loader;
788 #ifdef CONFIG_BLK_DEV_RAM
789 rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
790 rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
791 rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
795 printk(KERN_INFO "BIOS-provided physical RAM map:\n");
796 print_memory_map(memory_setup());
800 if (!boot_params.hdr.root_flags)
801 root_mountflags &= ~MS_RDONLY;
802 init_mm.start_code = (unsigned long) _text;
803 init_mm.end_code = (unsigned long) _etext;
804 init_mm.end_data = (unsigned long) _edata;
805 init_mm.brk = init_pg_tables_end + PAGE_OFFSET;
807 code_resource.start = virt_to_phys(_text);
808 code_resource.end = virt_to_phys(_etext)-1;
809 data_resource.start = virt_to_phys(_etext);
810 data_resource.end = virt_to_phys(_edata)-1;
811 bss_resource.start = virt_to_phys(&__bss_start);
812 bss_resource.end = virt_to_phys(&__bss_stop)-1;
816 if (user_defined_memmap) {
817 printk(KERN_INFO "user-defined physical RAM map:\n");
818 print_memory_map("user");
821 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
822 *cmdline_p = command_line;
827 /* update e820 for memory not covered by WB MTRRs */
828 propagate_e820_map();
830 if (mtrr_trim_uncached_memory(max_pfn))
831 propagate_e820_map();
833 max_low_pfn = setup_memory();
835 #ifdef CONFIG_KVM_CLOCK
841 * Must be after max_low_pfn is determined, and before kernel
842 * pagetables are setup.
849 * NOTE: before this point _nobody_ is allowed to allocate
850 * any memory using the bootmem allocator. Although the
851 * allocator is now initialised only the first 8Mb of the kernel
852 * virtual address space has been mapped. All allocations before
853 * paging_init() has completed must use the alloc_bootmem_low_pages()
854 * variant (which allocates DMA'able memory) and care must be taken
855 * not to exceed the 8Mb limit.
859 smp_alloc_memory(); /* AP processor realmode stacks in low memory*/
864 * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
867 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
868 if (init_ohci1394_dma_early)
869 init_ohci1394_dma_on_all_controllers();
872 remapped_pgdat_init();
877 * NOTE: at this point the bootmem allocator is fully available.
880 #ifdef CONFIG_BLK_DEV_INITRD
884 paravirt_post_allocator_init();
890 #ifdef CONFIG_X86_SMP
892 * setup to use the early static init tables during kernel startup
893 * X86_SMP will exclude sub-arches that don't deal well with it.
895 x86_cpu_to_apicid_early_ptr = (void *)x86_cpu_to_apicid_init;
896 x86_bios_cpu_apicid_early_ptr = (void *)x86_bios_cpu_apicid_init;
898 x86_cpu_to_node_map_early_ptr = (void *)x86_cpu_to_node_map_init;
902 #ifdef CONFIG_X86_GENERICARCH
903 generic_apic_probe();
908 * Parse the ACPI tables for possible boot-time SMP configuration.
910 acpi_boot_table_init();
918 #if defined(CONFIG_SMP) && defined(CONFIG_X86_PC)
920 printk(KERN_WARNING "More than 8 CPUs detected and "
921 "CONFIG_X86_PC cannot handle it.\nUse "
922 "CONFIG_X86_GENERICARCH or CONFIG_X86_BIGSMP.\n");
925 #ifdef CONFIG_X86_LOCAL_APIC
926 if (smp_found_config)
930 e820_register_memory();
931 e820_mark_nosave_regions();
934 #if defined(CONFIG_VGA_CONSOLE)
935 if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
936 conswitchp = &vga_con;
937 #elif defined(CONFIG_DUMMY_CONSOLE)
938 conswitchp = &dummy_con;
944 * Request address space for all standard resources
946 * This is called just before pcibios_init(), which is also a
947 * subsys_initcall, but is linked in later (in arch/i386/pci/common.c).
949 static int __init request_standard_resources(void)
953 printk(KERN_INFO "Setting up standard PCI resources\n");
954 init_iomem_resources(&code_resource, &data_resource, &bss_resource);
956 request_resource(&iomem_resource, &video_ram_resource);
958 /* request I/O space for devices used on all i[345]86 PCs */
959 for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
960 request_resource(&ioport_resource, &standard_io_resources[i]);
964 subsys_initcall(request_standard_resources);