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 #ifdef CONFIG_PROC_VMCORE
241 /* elfcorehdr= specifies the location of elf core header
242 * stored by the crashed kernel.
244 static int __init parse_elfcorehdr(char *arg)
249 elfcorehdr_addr = memparse(arg, &arg);
252 early_param("elfcorehdr", parse_elfcorehdr);
253 #endif /* CONFIG_PROC_VMCORE */
256 * highmem=size forces highmem to be exactly 'size' bytes.
257 * This works even on boxes that have no highmem otherwise.
258 * This also works to reduce highmem size on bigger boxes.
260 static int __init parse_highmem(char *arg)
265 highmem_pages = memparse(arg, &arg) >> PAGE_SHIFT;
268 early_param("highmem", parse_highmem);
271 * vmalloc=size forces the vmalloc area to be exactly 'size'
272 * bytes. This can be used to increase (or decrease) the
273 * vmalloc area - the default is 128m.
275 static int __init parse_vmalloc(char *arg)
280 __VMALLOC_RESERVE = memparse(arg, &arg);
283 early_param("vmalloc", parse_vmalloc);
286 * reservetop=size reserves a hole at the top of the kernel address space which
287 * a hypervisor can load into later. Needed for dynamically loaded hypervisors,
288 * so relocating the fixmap can be done before paging initialization.
290 static int __init parse_reservetop(char *arg)
292 unsigned long address;
297 address = memparse(arg, &arg);
298 reserve_top_address(address);
301 early_param("reservetop", parse_reservetop);
304 * Determine low and high memory ranges:
306 unsigned long __init find_max_low_pfn(void)
308 unsigned long max_low_pfn;
310 max_low_pfn = max_pfn;
311 if (max_low_pfn > MAXMEM_PFN) {
312 if (highmem_pages == -1)
313 highmem_pages = max_pfn - MAXMEM_PFN;
314 if (highmem_pages + MAXMEM_PFN < max_pfn)
315 max_pfn = MAXMEM_PFN + highmem_pages;
316 if (highmem_pages + MAXMEM_PFN > max_pfn) {
317 printk("only %luMB highmem pages available, ignoring highmem size of %uMB.\n", pages_to_mb(max_pfn - MAXMEM_PFN), pages_to_mb(highmem_pages));
320 max_low_pfn = MAXMEM_PFN;
321 #ifndef CONFIG_HIGHMEM
322 /* Maximum memory usable is what is directly addressable */
323 printk(KERN_WARNING "Warning only %ldMB will be used.\n",
325 if (max_pfn > MAX_NONPAE_PFN)
326 printk(KERN_WARNING "Use a HIGHMEM64G enabled kernel.\n");
328 printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n");
329 max_pfn = MAXMEM_PFN;
330 #else /* !CONFIG_HIGHMEM */
331 #ifndef CONFIG_HIGHMEM64G
332 if (max_pfn > MAX_NONPAE_PFN) {
333 max_pfn = MAX_NONPAE_PFN;
334 printk(KERN_WARNING "Warning only 4GB will be used.\n");
335 printk(KERN_WARNING "Use a HIGHMEM64G enabled kernel.\n");
337 #endif /* !CONFIG_HIGHMEM64G */
338 #endif /* !CONFIG_HIGHMEM */
340 if (highmem_pages == -1)
342 #ifdef CONFIG_HIGHMEM
343 if (highmem_pages >= max_pfn) {
344 printk(KERN_ERR "highmem size specified (%uMB) is bigger than pages available (%luMB)!.\n", pages_to_mb(highmem_pages), pages_to_mb(max_pfn));
348 if (max_low_pfn-highmem_pages < 64*1024*1024/PAGE_SIZE){
349 printk(KERN_ERR "highmem size %uMB results in smaller than 64MB lowmem, ignoring it.\n", pages_to_mb(highmem_pages));
352 max_low_pfn -= highmem_pages;
356 printk(KERN_ERR "ignoring highmem size on non-highmem kernel!\n");
362 #define BIOS_LOWMEM_KILOBYTES 0x413
365 * The BIOS places the EBDA/XBDA at the top of conventional
366 * memory, and usually decreases the reported amount of
367 * conventional memory (int 0x12) too. This also contains a
368 * workaround for Dell systems that neglect to reserve EBDA.
369 * The same workaround also avoids a problem with the AMD768MPX
370 * chipset: reserve a page before VGA to prevent PCI prefetch
371 * into it (errata #56). Usually the page is reserved anyways,
372 * unless you have no PS/2 mouse plugged in.
374 static void __init reserve_ebda_region(void)
376 unsigned int lowmem, ebda_addr;
378 /* To determine the position of the EBDA and the */
379 /* end of conventional memory, we need to look at */
380 /* the BIOS data area. In a paravirtual environment */
381 /* that area is absent. We'll just have to assume */
382 /* that the paravirt case can handle memory setup */
383 /* correctly, without our help. */
384 if (paravirt_enabled())
387 /* end of low (conventional) memory */
388 lowmem = *(unsigned short *)__va(BIOS_LOWMEM_KILOBYTES);
391 /* start of EBDA area */
392 ebda_addr = get_bios_ebda();
394 /* Fixup: bios puts an EBDA in the top 64K segment */
395 /* of conventional memory, but does not adjust lowmem. */
396 if ((lowmem - ebda_addr) <= 0x10000)
399 /* Fixup: bios does not report an EBDA at all. */
400 /* Some old Dells seem to need 4k anyhow (bugzilla 2990) */
401 if ((ebda_addr == 0) && (lowmem >= 0x9f000))
404 /* Paranoia: should never happen, but... */
405 if ((lowmem == 0) || (lowmem >= 0x100000))
408 /* reserve all memory between lowmem and the 1MB mark */
409 reserve_bootmem(lowmem, 0x100000 - lowmem, BOOTMEM_DEFAULT);
412 #ifndef CONFIG_NEED_MULTIPLE_NODES
413 static void __init setup_bootmem_allocator(void);
414 static unsigned long __init setup_memory(void)
417 * partially used pages are not usable - thus
418 * we are rounding upwards:
420 min_low_pfn = PFN_UP(init_pg_tables_end);
422 max_low_pfn = find_max_low_pfn();
424 #ifdef CONFIG_HIGHMEM
425 highstart_pfn = highend_pfn = max_pfn;
426 if (max_pfn > max_low_pfn) {
427 highstart_pfn = max_low_pfn;
429 printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
430 pages_to_mb(highend_pfn - highstart_pfn));
431 num_physpages = highend_pfn;
432 high_memory = (void *) __va(highstart_pfn * PAGE_SIZE - 1) + 1;
434 num_physpages = max_low_pfn;
435 high_memory = (void *) __va(max_low_pfn * PAGE_SIZE - 1) + 1;
437 #ifdef CONFIG_FLATMEM
438 max_mapnr = num_physpages;
440 printk(KERN_NOTICE "%ldMB LOWMEM available.\n",
441 pages_to_mb(max_low_pfn));
443 setup_bootmem_allocator();
448 static void __init zone_sizes_init(void)
450 unsigned long max_zone_pfns[MAX_NR_ZONES];
451 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
452 max_zone_pfns[ZONE_DMA] =
453 virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
454 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
455 #ifdef CONFIG_HIGHMEM
456 max_zone_pfns[ZONE_HIGHMEM] = highend_pfn;
457 add_active_range(0, 0, highend_pfn);
459 add_active_range(0, 0, max_low_pfn);
462 free_area_init_nodes(max_zone_pfns);
465 extern unsigned long __init setup_memory(void);
466 extern void zone_sizes_init(void);
467 #endif /* !CONFIG_NEED_MULTIPLE_NODES */
469 static inline unsigned long long get_total_mem(void)
471 unsigned long long total;
473 total = max_low_pfn - min_low_pfn;
474 #ifdef CONFIG_HIGHMEM
475 total += highend_pfn - highstart_pfn;
478 return total << PAGE_SHIFT;
482 static void __init reserve_crashkernel(void)
484 unsigned long long total_mem;
485 unsigned long long crash_size, crash_base;
488 total_mem = get_total_mem();
490 ret = parse_crashkernel(boot_command_line, total_mem,
491 &crash_size, &crash_base);
492 if (ret == 0 && crash_size > 0) {
493 if (crash_base > 0) {
494 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
495 "for crashkernel (System RAM: %ldMB)\n",
496 (unsigned long)(crash_size >> 20),
497 (unsigned long)(crash_base >> 20),
498 (unsigned long)(total_mem >> 20));
499 crashk_res.start = crash_base;
500 crashk_res.end = crash_base + crash_size - 1;
501 reserve_bootmem(crash_base, crash_size,
504 printk(KERN_INFO "crashkernel reservation failed - "
505 "you have to specify a base address\n");
509 static inline void __init reserve_crashkernel(void)
513 #ifdef CONFIG_BLK_DEV_INITRD
515 static bool do_relocate_initrd = false;
517 static void __init reserve_initrd(void)
519 unsigned long ramdisk_image = boot_params.hdr.ramdisk_image;
520 unsigned long ramdisk_size = boot_params.hdr.ramdisk_size;
521 unsigned long ramdisk_end = ramdisk_image + ramdisk_size;
522 unsigned long end_of_lowmem = max_low_pfn << PAGE_SHIFT;
523 unsigned long ramdisk_here;
527 if (!boot_params.hdr.type_of_loader ||
528 !ramdisk_image || !ramdisk_size)
529 return; /* No initrd provided by bootloader */
531 if (ramdisk_end < ramdisk_image) {
532 printk(KERN_ERR "initrd wraps around end of memory, "
533 "disabling initrd\n");
536 if (ramdisk_size >= end_of_lowmem/2) {
537 printk(KERN_ERR "initrd too large to handle, "
538 "disabling initrd\n");
541 if (ramdisk_end <= end_of_lowmem) {
542 /* All in lowmem, easy case */
543 reserve_bootmem(ramdisk_image, ramdisk_size, BOOTMEM_DEFAULT);
544 initrd_start = ramdisk_image + PAGE_OFFSET;
545 initrd_end = initrd_start+ramdisk_size;
549 /* We need to move the initrd down into lowmem */
550 ramdisk_here = (end_of_lowmem - ramdisk_size) & PAGE_MASK;
552 /* Note: this includes all the lowmem currently occupied by
553 the initrd, we rely on that fact to keep the data intact. */
554 reserve_bootmem(ramdisk_here, ramdisk_size, BOOTMEM_DEFAULT);
555 initrd_start = ramdisk_here + PAGE_OFFSET;
556 initrd_end = initrd_start + ramdisk_size;
558 do_relocate_initrd = true;
561 #define MAX_MAP_CHUNK (NR_FIX_BTMAPS << PAGE_SHIFT)
563 static void __init relocate_initrd(void)
565 unsigned long ramdisk_image = boot_params.hdr.ramdisk_image;
566 unsigned long ramdisk_size = boot_params.hdr.ramdisk_size;
567 unsigned long end_of_lowmem = max_low_pfn << PAGE_SHIFT;
568 unsigned long ramdisk_here;
569 unsigned long slop, clen, mapaddr;
572 if (!do_relocate_initrd)
575 ramdisk_here = initrd_start - PAGE_OFFSET;
577 q = (char *)initrd_start;
579 /* Copy any lowmem portion of the initrd */
580 if (ramdisk_image < end_of_lowmem) {
581 clen = end_of_lowmem - ramdisk_image;
582 p = (char *)__va(ramdisk_image);
585 ramdisk_image += clen;
586 ramdisk_size -= clen;
589 /* Copy the highmem portion of the initrd */
590 while (ramdisk_size) {
591 slop = ramdisk_image & ~PAGE_MASK;
593 if (clen > MAX_MAP_CHUNK-slop)
594 clen = MAX_MAP_CHUNK-slop;
595 mapaddr = ramdisk_image & PAGE_MASK;
596 p = early_ioremap(mapaddr, clen+slop);
597 memcpy(q, p+slop, clen);
598 early_iounmap(p, clen+slop);
600 ramdisk_image += clen;
601 ramdisk_size -= clen;
605 #endif /* CONFIG_BLK_DEV_INITRD */
607 void __init setup_bootmem_allocator(void)
609 unsigned long bootmap_size;
611 * Initialize the boot-time allocator (with low memory only):
613 bootmap_size = init_bootmem(min_low_pfn, max_low_pfn);
615 register_bootmem_low_pages(max_low_pfn);
618 * Reserve the bootmem bitmap itself as well. We do this in two
619 * steps (first step was init_bootmem()) because this catches
620 * the (very unlikely) case of us accidentally initializing the
621 * bootmem allocator with an invalid RAM area.
623 reserve_bootmem(__pa_symbol(_text), (PFN_PHYS(min_low_pfn) +
624 bootmap_size + PAGE_SIZE-1) - __pa_symbol(_text),
628 * reserve physical page 0 - it's a special BIOS page on many boxes,
629 * enabling clean reboots, SMP operation, laptop functions.
631 reserve_bootmem(0, PAGE_SIZE, BOOTMEM_DEFAULT);
633 /* reserve EBDA region */
634 reserve_ebda_region();
638 * But first pinch a few for the stack/trampoline stuff
639 * FIXME: Don't need the extra page at 4K, but need to fix
640 * trampoline before removing it. (see the GDT stuff)
642 reserve_bootmem(PAGE_SIZE, PAGE_SIZE, BOOTMEM_DEFAULT);
644 #ifdef CONFIG_ACPI_SLEEP
646 * Reserve low memory region for sleep support.
648 acpi_reserve_bootmem();
650 #ifdef CONFIG_X86_FIND_SMP_CONFIG
652 * Find and reserve possible boot-time SMP configuration:
656 #ifdef CONFIG_BLK_DEV_INITRD
660 reserve_crashkernel();
662 reserve_ibft_region();
666 * The node 0 pgdat is initialized before all of these because
667 * it's needed for bootmem. node>0 pgdats have their virtual
668 * space allocated before the pagetables are in place to access
669 * them, so they can't be cleared then.
671 * This should all compile down to nothing when NUMA is off.
673 static void __init remapped_pgdat_init(void)
677 for_each_online_node(nid) {
679 memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
684 static void set_mca_bus(int x)
689 static void set_mca_bus(int x) { }
694 * In the golden day, when everything among i386 and x86_64 will be
695 * integrated, this will not live here
697 void *x86_cpu_to_node_map_early_ptr;
698 int x86_cpu_to_node_map_init[NR_CPUS] = {
699 [0 ... NR_CPUS-1] = NUMA_NO_NODE
701 DEFINE_PER_CPU(int, x86_cpu_to_node_map) = NUMA_NO_NODE;
705 * Determine if we were loaded by an EFI loader. If so, then we have also been
706 * passed the efi memmap, systab, etc., so we should use these data structures
707 * for initialization. Note, the efi init code path is determined by the
708 * global efi_enabled. This allows the same kernel image to be used on existing
709 * systems (with a traditional BIOS) as well as on EFI systems.
711 void __init setup_arch(char **cmdline_p)
713 unsigned long max_low_pfn;
715 memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
716 pre_setup_arch_hook();
718 early_ioremap_init();
721 if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
726 ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
727 screen_info = boot_params.screen_info;
728 edid_info = boot_params.edid_info;
729 apm_info.bios = boot_params.apm_bios_info;
730 ist_info = boot_params.ist_info;
731 saved_video_mode = boot_params.hdr.vid_mode;
732 if( boot_params.sys_desc_table.length != 0 ) {
733 set_mca_bus(boot_params.sys_desc_table.table[3] & 0x2);
734 machine_id = boot_params.sys_desc_table.table[0];
735 machine_submodel_id = boot_params.sys_desc_table.table[1];
736 BIOS_revision = boot_params.sys_desc_table.table[2];
738 bootloader_type = boot_params.hdr.type_of_loader;
740 #ifdef CONFIG_BLK_DEV_RAM
741 rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
742 rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
743 rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
751 if (!boot_params.hdr.root_flags)
752 root_mountflags &= ~MS_RDONLY;
753 init_mm.start_code = (unsigned long) _text;
754 init_mm.end_code = (unsigned long) _etext;
755 init_mm.end_data = (unsigned long) _edata;
756 init_mm.brk = init_pg_tables_end + PAGE_OFFSET;
758 code_resource.start = virt_to_phys(_text);
759 code_resource.end = virt_to_phys(_etext)-1;
760 data_resource.start = virt_to_phys(_etext);
761 data_resource.end = virt_to_phys(_edata)-1;
762 bss_resource.start = virt_to_phys(&__bss_start);
763 bss_resource.end = virt_to_phys(&__bss_stop)-1;
767 finish_e820_parsing();
769 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
770 *cmdline_p = command_line;
775 /* update e820 for memory not covered by WB MTRRs */
776 propagate_e820_map();
778 if (mtrr_trim_uncached_memory(max_pfn))
779 propagate_e820_map();
781 max_low_pfn = setup_memory();
783 #ifdef CONFIG_KVM_CLOCK
789 * Must be after max_low_pfn is determined, and before kernel
790 * pagetables are setup.
797 * NOTE: before this point _nobody_ is allowed to allocate
798 * any memory using the bootmem allocator. Although the
799 * allocator is now initialised only the first 8Mb of the kernel
800 * virtual address space has been mapped. All allocations before
801 * paging_init() has completed must use the alloc_bootmem_low_pages()
802 * variant (which allocates DMA'able memory) and care must be taken
803 * not to exceed the 8Mb limit.
807 smp_alloc_memory(); /* AP processor realmode stacks in low memory*/
812 * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
815 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
816 if (init_ohci1394_dma_early)
817 init_ohci1394_dma_on_all_controllers();
820 remapped_pgdat_init();
825 * NOTE: at this point the bootmem allocator is fully available.
828 #ifdef CONFIG_BLK_DEV_INITRD
832 paravirt_post_allocator_init();
838 #ifdef CONFIG_X86_SMP
840 * setup to use the early static init tables during kernel startup
841 * X86_SMP will exclude sub-arches that don't deal well with it.
843 x86_cpu_to_apicid_early_ptr = (void *)x86_cpu_to_apicid_init;
844 x86_bios_cpu_apicid_early_ptr = (void *)x86_bios_cpu_apicid_init;
846 x86_cpu_to_node_map_early_ptr = (void *)x86_cpu_to_node_map_init;
850 #ifdef CONFIG_X86_GENERICARCH
851 generic_apic_probe();
856 * Parse the ACPI tables for possible boot-time SMP configuration.
858 acpi_boot_table_init();
866 #if defined(CONFIG_SMP) && defined(CONFIG_X86_PC)
868 printk(KERN_WARNING "More than 8 CPUs detected and "
869 "CONFIG_X86_PC cannot handle it.\nUse "
870 "CONFIG_X86_GENERICARCH or CONFIG_X86_BIGSMP.\n");
873 #ifdef CONFIG_X86_LOCAL_APIC
874 if (smp_found_config)
878 e820_register_memory();
879 e820_mark_nosave_regions();
882 #if defined(CONFIG_VGA_CONSOLE)
883 if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
884 conswitchp = &vga_con;
885 #elif defined(CONFIG_DUMMY_CONSOLE)
886 conswitchp = &dummy_con;
892 * Request address space for all standard resources
894 * This is called just before pcibios_init(), which is also a
895 * subsys_initcall, but is linked in later (in arch/i386/pci/common.c).
897 static int __init request_standard_resources(void)
901 printk(KERN_INFO "Setting up standard PCI resources\n");
902 init_iomem_resources(&code_resource, &data_resource, &bss_resource);
904 request_resource(&iomem_resource, &video_ram_resource);
906 /* request I/O space for devices used on all i[345]86 PCs */
907 for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
908 request_resource(&ioport_resource, &standard_io_resources[i]);
912 subsys_initcall(request_standard_resources);