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_start __initdata = ~0UL;
75 unsigned long init_pg_tables_end __initdata = ~0UL;
80 static struct resource data_resource = {
81 .name = "Kernel data",
84 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
87 static struct resource code_resource = {
88 .name = "Kernel code",
91 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
94 static struct resource bss_resource = {
98 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
101 static struct resource video_ram_resource = {
102 .name = "Video RAM area",
105 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
108 static struct resource standard_io_resources[] = { {
112 .flags = IORESOURCE_BUSY | IORESOURCE_IO
117 .flags = IORESOURCE_BUSY | IORESOURCE_IO
122 .flags = IORESOURCE_BUSY | IORESOURCE_IO
127 .flags = IORESOURCE_BUSY | IORESOURCE_IO
132 .flags = IORESOURCE_BUSY | IORESOURCE_IO
137 .flags = IORESOURCE_BUSY | IORESOURCE_IO
139 .name = "dma page reg",
142 .flags = IORESOURCE_BUSY | IORESOURCE_IO
147 .flags = IORESOURCE_BUSY | IORESOURCE_IO
152 .flags = IORESOURCE_BUSY | IORESOURCE_IO
157 .flags = IORESOURCE_BUSY | IORESOURCE_IO
160 /* cpu data as detected by the assembly code in head.S */
161 struct cpuinfo_x86 new_cpu_data __cpuinitdata = { 0, 0, 0, 0, -1, 1, 0, 0, -1 };
162 /* common cpu data for all cpus */
163 struct cpuinfo_x86 boot_cpu_data __read_mostly = { 0, 0, 0, 0, -1, 1, 0, 0, -1 };
164 EXPORT_SYMBOL(boot_cpu_data);
166 unsigned int def_to_bigsmp;
168 #ifndef CONFIG_X86_PAE
169 unsigned long mmu_cr4_features;
171 unsigned long mmu_cr4_features = X86_CR4_PAE;
174 /* for MCA, but anyone else can use it if they want */
175 unsigned int machine_id;
176 unsigned int machine_submodel_id;
177 unsigned int BIOS_revision;
179 /* Boot loader ID as an integer, for the benefit of proc_dointvec */
182 /* user-defined highmem size */
183 static unsigned int highmem_pages = -1;
188 struct screen_info screen_info;
189 EXPORT_SYMBOL(screen_info);
190 struct apm_info apm_info;
191 EXPORT_SYMBOL(apm_info);
192 struct edid_info edid_info;
193 EXPORT_SYMBOL_GPL(edid_info);
194 struct ist_info ist_info;
195 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
196 defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
197 EXPORT_SYMBOL(ist_info);
200 extern void early_cpu_init(void);
201 extern int root_mountflags;
203 unsigned long saved_video_mode;
205 #define RAMDISK_IMAGE_START_MASK 0x07FF
206 #define RAMDISK_PROMPT_FLAG 0x8000
207 #define RAMDISK_LOAD_FLAG 0x4000
209 static char __initdata command_line[COMMAND_LINE_SIZE];
211 #ifndef CONFIG_DEBUG_BOOT_PARAMS
212 struct boot_params __initdata boot_params;
214 struct boot_params boot_params;
217 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
219 #ifdef CONFIG_EDD_MODULE
223 * copy_edd() - Copy the BIOS EDD information
224 * from boot_params into a safe place.
227 static inline void copy_edd(void)
229 memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer,
230 sizeof(edd.mbr_signature));
231 memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
232 edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
233 edd.edd_info_nr = boot_params.eddbuf_entries;
236 static inline void copy_edd(void)
241 #ifdef CONFIG_PROC_VMCORE
242 /* elfcorehdr= specifies the location of elf core header
243 * stored by the crashed kernel.
245 static int __init parse_elfcorehdr(char *arg)
250 elfcorehdr_addr = memparse(arg, &arg);
253 early_param("elfcorehdr", parse_elfcorehdr);
254 #endif /* CONFIG_PROC_VMCORE */
257 * highmem=size forces highmem to be exactly 'size' bytes.
258 * This works even on boxes that have no highmem otherwise.
259 * This also works to reduce highmem size on bigger boxes.
261 static int __init parse_highmem(char *arg)
266 highmem_pages = memparse(arg, &arg) >> PAGE_SHIFT;
269 early_param("highmem", parse_highmem);
272 * vmalloc=size forces the vmalloc area to be exactly 'size'
273 * bytes. This can be used to increase (or decrease) the
274 * vmalloc area - the default is 128m.
276 static int __init parse_vmalloc(char *arg)
281 __VMALLOC_RESERVE = memparse(arg, &arg);
284 early_param("vmalloc", parse_vmalloc);
287 * reservetop=size reserves a hole at the top of the kernel address space which
288 * a hypervisor can load into later. Needed for dynamically loaded hypervisors,
289 * so relocating the fixmap can be done before paging initialization.
291 static int __init parse_reservetop(char *arg)
293 unsigned long address;
298 address = memparse(arg, &arg);
299 reserve_top_address(address);
302 early_param("reservetop", parse_reservetop);
305 * Determine low and high memory ranges:
307 unsigned long __init find_max_low_pfn(void)
309 unsigned long max_low_pfn;
311 max_low_pfn = max_pfn;
312 if (max_low_pfn > MAXMEM_PFN) {
313 if (highmem_pages == -1)
314 highmem_pages = max_pfn - MAXMEM_PFN;
315 if (highmem_pages + MAXMEM_PFN < max_pfn)
316 max_pfn = MAXMEM_PFN + highmem_pages;
317 if (highmem_pages + MAXMEM_PFN > max_pfn) {
318 printk("only %luMB highmem pages available, ignoring highmem size of %uMB.\n", pages_to_mb(max_pfn - MAXMEM_PFN), pages_to_mb(highmem_pages));
321 max_low_pfn = MAXMEM_PFN;
322 #ifndef CONFIG_HIGHMEM
323 /* Maximum memory usable is what is directly addressable */
324 printk(KERN_WARNING "Warning only %ldMB will be used.\n",
326 if (max_pfn > MAX_NONPAE_PFN)
327 printk(KERN_WARNING "Use a HIGHMEM64G enabled kernel.\n");
329 printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n");
330 max_pfn = MAXMEM_PFN;
331 #else /* !CONFIG_HIGHMEM */
332 #ifndef CONFIG_HIGHMEM64G
333 if (max_pfn > MAX_NONPAE_PFN) {
334 max_pfn = MAX_NONPAE_PFN;
335 printk(KERN_WARNING "Warning only 4GB will be used.\n");
336 printk(KERN_WARNING "Use a HIGHMEM64G enabled kernel.\n");
338 #endif /* !CONFIG_HIGHMEM64G */
339 #endif /* !CONFIG_HIGHMEM */
341 if (highmem_pages == -1)
343 #ifdef CONFIG_HIGHMEM
344 if (highmem_pages >= max_pfn) {
345 printk(KERN_ERR "highmem size specified (%uMB) is bigger than pages available (%luMB)!.\n", pages_to_mb(highmem_pages), pages_to_mb(max_pfn));
349 if (max_low_pfn-highmem_pages < 64*1024*1024/PAGE_SIZE){
350 printk(KERN_ERR "highmem size %uMB results in smaller than 64MB lowmem, ignoring it.\n", pages_to_mb(highmem_pages));
353 max_low_pfn -= highmem_pages;
357 printk(KERN_ERR "ignoring highmem size on non-highmem kernel!\n");
363 #ifndef CONFIG_NEED_MULTIPLE_NODES
364 static void __init setup_bootmem_allocator(void);
365 static unsigned long __init setup_memory(void)
368 * partially used pages are not usable - thus
369 * we are rounding upwards:
371 min_low_pfn = PFN_UP(init_pg_tables_end);
373 max_low_pfn = find_max_low_pfn();
375 #ifdef CONFIG_HIGHMEM
376 highstart_pfn = highend_pfn = max_pfn;
377 if (max_pfn > max_low_pfn) {
378 highstart_pfn = max_low_pfn;
380 memory_present(0, 0, highend_pfn);
381 printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
382 pages_to_mb(highend_pfn - highstart_pfn));
383 num_physpages = highend_pfn;
384 high_memory = (void *) __va(highstart_pfn * PAGE_SIZE - 1) + 1;
386 memory_present(0, 0, max_low_pfn);
387 num_physpages = max_low_pfn;
388 high_memory = (void *) __va(max_low_pfn * PAGE_SIZE - 1) + 1;
390 #ifdef CONFIG_FLATMEM
391 max_mapnr = num_physpages;
393 printk(KERN_NOTICE "%ldMB LOWMEM available.\n",
394 pages_to_mb(max_low_pfn));
396 setup_bootmem_allocator();
401 static void __init zone_sizes_init(void)
403 unsigned long max_zone_pfns[MAX_NR_ZONES];
404 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
405 max_zone_pfns[ZONE_DMA] =
406 virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
407 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
408 #ifdef CONFIG_HIGHMEM
409 max_zone_pfns[ZONE_HIGHMEM] = highend_pfn;
410 add_active_range(0, 0, highend_pfn);
412 add_active_range(0, 0, max_low_pfn);
415 free_area_init_nodes(max_zone_pfns);
418 extern unsigned long __init setup_memory(void);
419 extern void zone_sizes_init(void);
420 #endif /* !CONFIG_NEED_MULTIPLE_NODES */
422 static inline unsigned long long get_total_mem(void)
424 unsigned long long total;
426 total = max_low_pfn - min_low_pfn;
427 #ifdef CONFIG_HIGHMEM
428 total += highend_pfn - highstart_pfn;
431 return total << PAGE_SHIFT;
435 static void __init reserve_crashkernel(void)
437 unsigned long long total_mem;
438 unsigned long long crash_size, crash_base;
441 total_mem = get_total_mem();
443 ret = parse_crashkernel(boot_command_line, total_mem,
444 &crash_size, &crash_base);
445 if (ret == 0 && crash_size > 0) {
446 if (crash_base > 0) {
447 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
448 "for crashkernel (System RAM: %ldMB)\n",
449 (unsigned long)(crash_size >> 20),
450 (unsigned long)(crash_base >> 20),
451 (unsigned long)(total_mem >> 20));
452 crashk_res.start = crash_base;
453 crashk_res.end = crash_base + crash_size - 1;
454 reserve_bootmem(crash_base, crash_size,
457 printk(KERN_INFO "crashkernel reservation failed - "
458 "you have to specify a base address\n");
462 static inline void __init reserve_crashkernel(void)
466 #ifdef CONFIG_BLK_DEV_INITRD
468 static bool do_relocate_initrd = false;
470 static void __init reserve_initrd(void)
472 u64 ramdisk_image = boot_params.hdr.ramdisk_image;
473 u64 ramdisk_size = boot_params.hdr.ramdisk_size;
474 u64 ramdisk_end = ramdisk_image + ramdisk_size;
475 u64 end_of_lowmem = max_low_pfn << PAGE_SHIFT;
478 if (!boot_params.hdr.type_of_loader ||
479 !ramdisk_image || !ramdisk_size)
480 return; /* No initrd provided by bootloader */
484 if (ramdisk_size >= end_of_lowmem/2) {
485 free_early(ramdisk_image, ramdisk_end);
486 printk(KERN_ERR "initrd too large to handle, "
487 "disabling initrd\n");
491 printk(KERN_INFO "old RAMDISK: %08llx - %08llx\n", ramdisk_image,
495 if (ramdisk_end <= end_of_lowmem) {
496 /* All in lowmem, easy case */
498 * don't need to reserve again, already reserved early
499 * in i386_start_kernel
501 initrd_start = ramdisk_image + PAGE_OFFSET;
502 initrd_end = initrd_start+ramdisk_size;
506 /* We need to move the initrd down into lowmem */
507 ramdisk_here = find_e820_area(min_low_pfn<<PAGE_SHIFT,
508 end_of_lowmem, ramdisk_size,
511 if (ramdisk_here == -1ULL)
512 panic("Cannot find place for new RAMDISK of size %lld\n",
515 /* Note: this includes all the lowmem currently occupied by
516 the initrd, we rely on that fact to keep the data intact. */
517 reserve_early(ramdisk_here, ramdisk_here + ramdisk_size,
519 initrd_start = ramdisk_here + PAGE_OFFSET;
520 initrd_end = initrd_start + ramdisk_size;
521 printk(KERN_INFO "Allocated new RAMDISK: %08llx - %08llx\n",
522 ramdisk_here, ramdisk_here + ramdisk_size);
524 do_relocate_initrd = true;
527 #define MAX_MAP_CHUNK (NR_FIX_BTMAPS << PAGE_SHIFT)
529 static void __init relocate_initrd(void)
531 u64 ramdisk_image = boot_params.hdr.ramdisk_image;
532 u64 ramdisk_size = boot_params.hdr.ramdisk_size;
533 u64 end_of_lowmem = max_low_pfn << PAGE_SHIFT;
535 unsigned long slop, clen, mapaddr;
538 if (!do_relocate_initrd)
541 ramdisk_here = initrd_start - PAGE_OFFSET;
543 q = (char *)initrd_start;
545 /* Copy any lowmem portion of the initrd */
546 if (ramdisk_image < end_of_lowmem) {
547 clen = end_of_lowmem - ramdisk_image;
548 p = (char *)__va(ramdisk_image);
551 /* need to free these low pages...*/
552 printk(KERN_INFO "Freeing old partial RAMDISK %08llx-%08llx\n",
553 ramdisk_image, ramdisk_image + clen - 1);
554 free_bootmem(ramdisk_image, clen);
555 ramdisk_image += clen;
556 ramdisk_size -= clen;
559 /* Copy the highmem portion of the initrd */
560 while (ramdisk_size) {
561 slop = ramdisk_image & ~PAGE_MASK;
563 if (clen > MAX_MAP_CHUNK-slop)
564 clen = MAX_MAP_CHUNK-slop;
565 mapaddr = ramdisk_image & PAGE_MASK;
566 p = early_ioremap(mapaddr, clen+slop);
567 memcpy(q, p+slop, clen);
568 early_iounmap(p, clen+slop);
570 ramdisk_image += clen;
571 ramdisk_size -= clen;
573 /* high pages is not converted by early_res_to_bootmem */
574 ramdisk_image = boot_params.hdr.ramdisk_image;
575 ramdisk_size = boot_params.hdr.ramdisk_size;
576 printk(KERN_INFO "Copied RAMDISK from %016llx - %016llx to %08llx - %08llx\n",
577 ramdisk_image, ramdisk_image + ramdisk_size - 1,
578 ramdisk_here, ramdisk_here + ramdisk_size - 1);
581 #endif /* CONFIG_BLK_DEV_INITRD */
583 void __init setup_bootmem_allocator(void)
585 unsigned long bootmap_size, bootmap;
587 * Initialize the boot-time allocator (with low memory only):
589 bootmap_size = bootmem_bootmap_pages(max_low_pfn)<<PAGE_SHIFT;
590 bootmap = find_e820_area(min_low_pfn<<PAGE_SHIFT,
591 max_pfn_mapped<<PAGE_SHIFT, bootmap_size,
594 panic("Cannot find bootmem map of size %ld\n", bootmap_size);
595 reserve_early(bootmap, bootmap + bootmap_size, "BOOTMAP");
596 #ifdef CONFIG_BLK_DEV_INITRD
599 bootmap_size = init_bootmem(bootmap >> PAGE_SHIFT, max_low_pfn);
600 printk(KERN_INFO " mapped low ram: 0 - %08lx\n",
601 max_pfn_mapped<<PAGE_SHIFT);
602 printk(KERN_INFO " low ram: %08lx - %08lx\n",
603 min_low_pfn<<PAGE_SHIFT, max_low_pfn<<PAGE_SHIFT);
604 printk(KERN_INFO " bootmap %08lx - %08lx\n",
605 bootmap, bootmap + bootmap_size);
606 register_bootmem_low_pages(max_low_pfn);
607 early_res_to_bootmem(0, max_low_pfn<<PAGE_SHIFT);
609 #ifdef CONFIG_ACPI_SLEEP
611 * Reserve low memory region for sleep support.
613 acpi_reserve_bootmem();
615 #ifdef CONFIG_X86_FIND_SMP_CONFIG
617 * Find and reserve possible boot-time SMP configuration:
621 reserve_crashkernel();
623 reserve_ibft_region();
627 * The node 0 pgdat is initialized before all of these because
628 * it's needed for bootmem. node>0 pgdats have their virtual
629 * space allocated before the pagetables are in place to access
630 * them, so they can't be cleared then.
632 * This should all compile down to nothing when NUMA is off.
634 static void __init remapped_pgdat_init(void)
638 for_each_online_node(nid) {
640 memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
645 static void set_mca_bus(int x)
650 static void set_mca_bus(int x) { }
655 * In the golden day, when everything among i386 and x86_64 will be
656 * integrated, this will not live here
658 void *x86_cpu_to_node_map_early_ptr;
659 int x86_cpu_to_node_map_init[NR_CPUS] = {
660 [0 ... NR_CPUS-1] = NUMA_NO_NODE
662 DEFINE_PER_CPU(int, x86_cpu_to_node_map) = NUMA_NO_NODE;
666 * Determine if we were loaded by an EFI loader. If so, then we have also been
667 * passed the efi memmap, systab, etc., so we should use these data structures
668 * for initialization. Note, the efi init code path is determined by the
669 * global efi_enabled. This allows the same kernel image to be used on existing
670 * systems (with a traditional BIOS) as well as on EFI systems.
672 void __init setup_arch(char **cmdline_p)
674 unsigned long max_low_pfn;
676 memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
677 pre_setup_arch_hook();
679 early_ioremap_init();
682 if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
687 ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
688 screen_info = boot_params.screen_info;
689 edid_info = boot_params.edid_info;
690 apm_info.bios = boot_params.apm_bios_info;
691 ist_info = boot_params.ist_info;
692 saved_video_mode = boot_params.hdr.vid_mode;
693 if( boot_params.sys_desc_table.length != 0 ) {
694 set_mca_bus(boot_params.sys_desc_table.table[3] & 0x2);
695 machine_id = boot_params.sys_desc_table.table[0];
696 machine_submodel_id = boot_params.sys_desc_table.table[1];
697 BIOS_revision = boot_params.sys_desc_table.table[2];
699 bootloader_type = boot_params.hdr.type_of_loader;
701 #ifdef CONFIG_BLK_DEV_RAM
702 rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
703 rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
704 rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
712 if (!boot_params.hdr.root_flags)
713 root_mountflags &= ~MS_RDONLY;
714 init_mm.start_code = (unsigned long) _text;
715 init_mm.end_code = (unsigned long) _etext;
716 init_mm.end_data = (unsigned long) _edata;
717 init_mm.brk = init_pg_tables_end + PAGE_OFFSET;
719 code_resource.start = virt_to_phys(_text);
720 code_resource.end = virt_to_phys(_etext)-1;
721 data_resource.start = virt_to_phys(_etext);
722 data_resource.end = virt_to_phys(_edata)-1;
723 bss_resource.start = virt_to_phys(&__bss_start);
724 bss_resource.end = virt_to_phys(&__bss_stop)-1;
728 finish_e820_parsing();
730 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
731 *cmdline_p = command_line;
736 /* update e820 for memory not covered by WB MTRRs */
739 if (mtrr_trim_uncached_memory(max_pfn))
742 max_low_pfn = setup_memory();
744 #ifdef CONFIG_KVM_CLOCK
750 * Must be after max_low_pfn is determined, and before kernel
751 * pagetables are setup.
758 * NOTE: before this point _nobody_ is allowed to allocate
759 * any memory using the bootmem allocator. Although the
760 * allocator is now initialised only the first 8Mb of the kernel
761 * virtual address space has been mapped. All allocations before
762 * paging_init() has completed must use the alloc_bootmem_low_pages()
763 * variant (which allocates DMA'able memory) and care must be taken
764 * not to exceed the 8Mb limit.
770 * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
773 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
774 if (init_ohci1394_dma_early)
775 init_ohci1394_dma_on_all_controllers();
778 remapped_pgdat_init();
783 * NOTE: at this point the bootmem allocator is fully available.
786 #ifdef CONFIG_BLK_DEV_INITRD
790 paravirt_post_allocator_init();
796 #ifdef CONFIG_X86_SMP
798 * setup to use the early static init tables during kernel startup
799 * X86_SMP will exclude sub-arches that don't deal well with it.
801 x86_cpu_to_apicid_early_ptr = (void *)x86_cpu_to_apicid_init;
802 x86_bios_cpu_apicid_early_ptr = (void *)x86_bios_cpu_apicid_init;
804 x86_cpu_to_node_map_early_ptr = (void *)x86_cpu_to_node_map_init;
808 #ifdef CONFIG_X86_GENERICARCH
809 generic_apic_probe();
814 * Parse the ACPI tables for possible boot-time SMP configuration.
816 acpi_boot_table_init();
824 #if defined(CONFIG_SMP) && defined(CONFIG_X86_PC)
826 printk(KERN_WARNING "More than 8 CPUs detected and "
827 "CONFIG_X86_PC cannot handle it.\nUse "
828 "CONFIG_X86_GENERICARCH or CONFIG_X86_BIGSMP.\n");
831 #if defined(CONFIG_X86_MPPARSE) || defined(CONFIG_X86_VISWS)
832 if (smp_found_config)
837 e820_mark_nosave_regions(max_low_pfn);
840 #if defined(CONFIG_VGA_CONSOLE)
841 if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
842 conswitchp = &vga_con;
843 #elif defined(CONFIG_DUMMY_CONSOLE)
844 conswitchp = &dummy_con;
850 * Request address space for all standard resources
852 * This is called just before pcibios_init(), which is also a
853 * subsys_initcall, but is linked in later (in arch/i386/pci/common.c).
855 static int __init request_standard_resources(void)
859 printk(KERN_INFO "Setting up standard PCI resources\n");
860 init_iomem_resources(&code_resource, &data_resource, &bss_resource);
862 request_resource(&iomem_resource, &video_ram_resource);
864 /* request I/O space for devices used on all i[345]86 PCs */
865 for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
866 request_resource(&ioport_resource, &standard_io_resources[i]);
870 subsys_initcall(request_standard_resources);