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/nodemask.h>
43 #include <linux/kexec.h>
44 #include <linux/crash_dump.h>
45 #include <linux/dmi.h>
46 #include <linux/pfn.h>
47 #include <linux/pci.h>
48 #include <linux/init_ohci1394_dma.h>
50 #include <video/edid.h>
55 #include <asm/mpspec.h>
56 #include <asm/mmzone.h>
57 #include <asm/setup.h>
58 #include <asm/arch_hooks.h>
59 #include <asm/sections.h>
60 #include <asm/io_apic.h>
64 #include <setup_arch.h>
65 #include <bios_ebda.h>
66 #include <asm/cacheflush.h>
68 /* This value is set up by the early boot code to point to the value
69 immediately after the boot time page tables. It contains a *physical*
70 address, and must not be in the .bss segment! */
71 unsigned long init_pg_tables_end __initdata = ~0UL;
76 static struct resource data_resource = {
77 .name = "Kernel data",
80 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
83 static struct resource code_resource = {
84 .name = "Kernel code",
87 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
90 static struct resource bss_resource = {
94 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
97 static struct resource video_ram_resource = {
98 .name = "Video RAM area",
101 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
104 static struct resource standard_io_resources[] = { {
108 .flags = IORESOURCE_BUSY | IORESOURCE_IO
113 .flags = IORESOURCE_BUSY | IORESOURCE_IO
118 .flags = IORESOURCE_BUSY | IORESOURCE_IO
123 .flags = IORESOURCE_BUSY | IORESOURCE_IO
128 .flags = IORESOURCE_BUSY | IORESOURCE_IO
130 .name = "dma page reg",
133 .flags = IORESOURCE_BUSY | IORESOURCE_IO
138 .flags = IORESOURCE_BUSY | IORESOURCE_IO
143 .flags = IORESOURCE_BUSY | IORESOURCE_IO
148 .flags = IORESOURCE_BUSY | IORESOURCE_IO
151 /* cpu data as detected by the assembly code in head.S */
152 struct cpuinfo_x86 new_cpu_data __cpuinitdata = { 0, 0, 0, 0, -1, 1, 0, 0, -1 };
153 /* common cpu data for all cpus */
154 struct cpuinfo_x86 boot_cpu_data __read_mostly = { 0, 0, 0, 0, -1, 1, 0, 0, -1 };
155 EXPORT_SYMBOL(boot_cpu_data);
157 unsigned long mmu_cr4_features;
159 /* for MCA, but anyone else can use it if they want */
160 unsigned int machine_id;
161 unsigned int machine_submodel_id;
162 unsigned int BIOS_revision;
163 unsigned int mca_pentium_flag;
165 /* Boot loader ID as an integer, for the benefit of proc_dointvec */
168 /* user-defined highmem size */
169 static unsigned int highmem_pages = -1;
174 struct screen_info screen_info;
175 EXPORT_SYMBOL(screen_info);
176 struct apm_info apm_info;
177 EXPORT_SYMBOL(apm_info);
178 struct edid_info edid_info;
179 EXPORT_SYMBOL_GPL(edid_info);
180 struct ist_info ist_info;
181 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
182 defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
183 EXPORT_SYMBOL(ist_info);
186 extern void early_cpu_init(void);
187 extern int root_mountflags;
189 unsigned long saved_videomode;
191 #define RAMDISK_IMAGE_START_MASK 0x07FF
192 #define RAMDISK_PROMPT_FLAG 0x8000
193 #define RAMDISK_LOAD_FLAG 0x4000
195 static char __initdata command_line[COMMAND_LINE_SIZE];
197 #ifndef CONFIG_DEBUG_BOOT_PARAMS
198 struct boot_params __initdata boot_params;
200 struct boot_params boot_params;
203 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
205 #ifdef CONFIG_EDD_MODULE
209 * copy_edd() - Copy the BIOS EDD information
210 * from boot_params into a safe place.
213 static inline void copy_edd(void)
215 memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer,
216 sizeof(edd.mbr_signature));
217 memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
218 edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
219 edd.edd_info_nr = boot_params.eddbuf_entries;
222 static inline void copy_edd(void)
227 int __initdata user_defined_memmap = 0;
230 * "mem=nopentium" disables the 4MB page tables.
231 * "mem=XXX[kKmM]" defines a memory region from HIGH_MEM
232 * to <mem>, overriding the bios size.
233 * "memmap=XXX[KkmM]@XXX[KkmM]" defines a memory region from
234 * <start> to <start>+<mem>, overriding the bios size.
236 * HPA tells me bootloaders need to parse mem=, so no new
237 * option should be mem= [also see Documentation/i386/boot.txt]
239 static int __init parse_mem(char *arg)
244 if (strcmp(arg, "nopentium") == 0) {
245 setup_clear_cpu_cap(X86_FEATURE_PSE);
247 /* If the user specifies memory size, we
248 * limit the BIOS-provided memory map to
249 * that size. exactmap can be used to specify
250 * the exact map. mem=number can be used to
251 * trim the existing memory map.
253 unsigned long long mem_size;
255 mem_size = memparse(arg, &arg);
256 limit_regions(mem_size);
257 user_defined_memmap = 1;
261 early_param("mem", parse_mem);
263 #ifdef CONFIG_PROC_VMCORE
264 /* elfcorehdr= specifies the location of elf core header
265 * stored by the crashed kernel.
267 static int __init parse_elfcorehdr(char *arg)
272 elfcorehdr_addr = memparse(arg, &arg);
275 early_param("elfcorehdr", parse_elfcorehdr);
276 #endif /* CONFIG_PROC_VMCORE */
279 * highmem=size forces highmem to be exactly 'size' bytes.
280 * This works even on boxes that have no highmem otherwise.
281 * This also works to reduce highmem size on bigger boxes.
283 static int __init parse_highmem(char *arg)
288 highmem_pages = memparse(arg, &arg) >> PAGE_SHIFT;
291 early_param("highmem", parse_highmem);
294 * vmalloc=size forces the vmalloc area to be exactly 'size'
295 * bytes. This can be used to increase (or decrease) the
296 * vmalloc area - the default is 128m.
298 static int __init parse_vmalloc(char *arg)
303 __VMALLOC_RESERVE = memparse(arg, &arg);
306 early_param("vmalloc", parse_vmalloc);
309 * reservetop=size reserves a hole at the top of the kernel address space which
310 * a hypervisor can load into later. Needed for dynamically loaded hypervisors,
311 * so relocating the fixmap can be done before paging initialization.
313 static int __init parse_reservetop(char *arg)
315 unsigned long address;
320 address = memparse(arg, &arg);
321 reserve_top_address(address);
324 early_param("reservetop", parse_reservetop);
327 * Determine low and high memory ranges:
329 unsigned long __init find_max_low_pfn(void)
331 unsigned long max_low_pfn;
333 max_low_pfn = max_pfn;
334 if (max_low_pfn > MAXMEM_PFN) {
335 if (highmem_pages == -1)
336 highmem_pages = max_pfn - MAXMEM_PFN;
337 if (highmem_pages + MAXMEM_PFN < max_pfn)
338 max_pfn = MAXMEM_PFN + highmem_pages;
339 if (highmem_pages + MAXMEM_PFN > max_pfn) {
340 printk("only %luMB highmem pages available, ignoring highmem size of %uMB.\n", pages_to_mb(max_pfn - MAXMEM_PFN), pages_to_mb(highmem_pages));
343 max_low_pfn = MAXMEM_PFN;
344 #ifndef CONFIG_HIGHMEM
345 /* Maximum memory usable is what is directly addressable */
346 printk(KERN_WARNING "Warning only %ldMB will be used.\n",
348 if (max_pfn > MAX_NONPAE_PFN)
349 printk(KERN_WARNING "Use a HIGHMEM64G enabled kernel.\n");
351 printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n");
352 max_pfn = MAXMEM_PFN;
353 #else /* !CONFIG_HIGHMEM */
354 #ifndef CONFIG_HIGHMEM64G
355 if (max_pfn > MAX_NONPAE_PFN) {
356 max_pfn = MAX_NONPAE_PFN;
357 printk(KERN_WARNING "Warning only 4GB will be used.\n");
358 printk(KERN_WARNING "Use a HIGHMEM64G enabled kernel.\n");
360 #endif /* !CONFIG_HIGHMEM64G */
361 #endif /* !CONFIG_HIGHMEM */
363 if (highmem_pages == -1)
365 #ifdef CONFIG_HIGHMEM
366 if (highmem_pages >= max_pfn) {
367 printk(KERN_ERR "highmem size specified (%uMB) is bigger than pages available (%luMB)!.\n", pages_to_mb(highmem_pages), pages_to_mb(max_pfn));
371 if (max_low_pfn-highmem_pages < 64*1024*1024/PAGE_SIZE){
372 printk(KERN_ERR "highmem size %uMB results in smaller than 64MB lowmem, ignoring it.\n", pages_to_mb(highmem_pages));
375 max_low_pfn -= highmem_pages;
379 printk(KERN_ERR "ignoring highmem size on non-highmem kernel!\n");
386 * workaround for Dell systems that neglect to reserve EBDA
388 static void __init reserve_ebda_region(void)
391 addr = get_bios_ebda();
393 reserve_bootmem(addr, PAGE_SIZE, BOOTMEM_DEFAULT);
396 #ifndef CONFIG_NEED_MULTIPLE_NODES
397 void __init setup_bootmem_allocator(void);
398 static unsigned long __init setup_memory(void)
401 * partially used pages are not usable - thus
402 * we are rounding upwards:
404 min_low_pfn = PFN_UP(init_pg_tables_end);
408 max_low_pfn = find_max_low_pfn();
410 #ifdef CONFIG_HIGHMEM
411 highstart_pfn = highend_pfn = max_pfn;
412 if (max_pfn > max_low_pfn) {
413 highstart_pfn = max_low_pfn;
415 printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
416 pages_to_mb(highend_pfn - highstart_pfn));
417 num_physpages = highend_pfn;
418 high_memory = (void *) __va(highstart_pfn * PAGE_SIZE - 1) + 1;
420 num_physpages = max_low_pfn;
421 high_memory = (void *) __va(max_low_pfn * PAGE_SIZE - 1) + 1;
423 #ifdef CONFIG_FLATMEM
424 max_mapnr = num_physpages;
426 printk(KERN_NOTICE "%ldMB LOWMEM available.\n",
427 pages_to_mb(max_low_pfn));
429 setup_bootmem_allocator();
434 void __init zone_sizes_init(void)
436 unsigned long max_zone_pfns[MAX_NR_ZONES];
437 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
438 max_zone_pfns[ZONE_DMA] =
439 virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
440 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
441 #ifdef CONFIG_HIGHMEM
442 max_zone_pfns[ZONE_HIGHMEM] = highend_pfn;
443 add_active_range(0, 0, highend_pfn);
445 add_active_range(0, 0, max_low_pfn);
448 free_area_init_nodes(max_zone_pfns);
451 extern unsigned long __init setup_memory(void);
452 extern void zone_sizes_init(void);
453 #endif /* !CONFIG_NEED_MULTIPLE_NODES */
455 static inline unsigned long long get_total_mem(void)
457 unsigned long long total;
459 total = max_low_pfn - min_low_pfn;
460 #ifdef CONFIG_HIGHMEM
461 total += highend_pfn - highstart_pfn;
464 return total << PAGE_SHIFT;
468 static void __init reserve_crashkernel(void)
470 unsigned long long total_mem;
471 unsigned long long crash_size, crash_base;
474 total_mem = get_total_mem();
476 ret = parse_crashkernel(boot_command_line, total_mem,
477 &crash_size, &crash_base);
478 if (ret == 0 && crash_size > 0) {
479 if (crash_base > 0) {
480 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
481 "for crashkernel (System RAM: %ldMB)\n",
482 (unsigned long)(crash_size >> 20),
483 (unsigned long)(crash_base >> 20),
484 (unsigned long)(total_mem >> 20));
485 crashk_res.start = crash_base;
486 crashk_res.end = crash_base + crash_size - 1;
487 reserve_bootmem(crash_base, crash_size,
490 printk(KERN_INFO "crashkernel reservation failed - "
491 "you have to specify a base address\n");
495 static inline void __init reserve_crashkernel(void)
499 #ifdef CONFIG_BLK_DEV_INITRD
501 static bool do_relocate_initrd = false;
503 static void __init reserve_initrd(void)
505 unsigned long ramdisk_image = boot_params.hdr.ramdisk_image;
506 unsigned long ramdisk_size = boot_params.hdr.ramdisk_size;
507 unsigned long ramdisk_end = ramdisk_image + ramdisk_size;
508 unsigned long end_of_lowmem = max_low_pfn << PAGE_SHIFT;
509 unsigned long ramdisk_here;
513 if (!boot_params.hdr.type_of_loader ||
514 !ramdisk_image || !ramdisk_size)
515 return; /* No initrd provided by bootloader */
517 if (ramdisk_end < ramdisk_image) {
518 printk(KERN_ERR "initrd wraps around end of memory, "
519 "disabling initrd\n");
522 if (ramdisk_size >= end_of_lowmem/2) {
523 printk(KERN_ERR "initrd too large to handle, "
524 "disabling initrd\n");
527 if (ramdisk_end <= end_of_lowmem) {
528 /* All in lowmem, easy case */
529 reserve_bootmem(ramdisk_image, ramdisk_size, BOOTMEM_DEFAULT);
530 initrd_start = ramdisk_image + PAGE_OFFSET;
531 initrd_end = initrd_start+ramdisk_size;
535 /* We need to move the initrd down into lowmem */
536 ramdisk_here = (end_of_lowmem - ramdisk_size) & PAGE_MASK;
538 /* Note: this includes all the lowmem currently occupied by
539 the initrd, we rely on that fact to keep the data intact. */
540 reserve_bootmem(ramdisk_here, ramdisk_size, BOOTMEM_DEFAULT);
541 initrd_start = ramdisk_here + PAGE_OFFSET;
542 initrd_end = initrd_start + ramdisk_size;
544 do_relocate_initrd = true;
547 #define MAX_MAP_CHUNK (NR_FIX_BTMAPS << PAGE_SHIFT)
549 static void __init relocate_initrd(void)
551 unsigned long ramdisk_image = boot_params.hdr.ramdisk_image;
552 unsigned long ramdisk_size = boot_params.hdr.ramdisk_size;
553 unsigned long end_of_lowmem = max_low_pfn << PAGE_SHIFT;
554 unsigned long ramdisk_here;
555 unsigned long slop, clen, mapaddr;
558 if (!do_relocate_initrd)
561 ramdisk_here = initrd_start - PAGE_OFFSET;
563 q = (char *)initrd_start;
565 /* Copy any lowmem portion of the initrd */
566 if (ramdisk_image < end_of_lowmem) {
567 clen = end_of_lowmem - ramdisk_image;
568 p = (char *)__va(ramdisk_image);
571 ramdisk_image += clen;
572 ramdisk_size -= clen;
575 /* Copy the highmem portion of the initrd */
576 while (ramdisk_size) {
577 slop = ramdisk_image & ~PAGE_MASK;
579 if (clen > MAX_MAP_CHUNK-slop)
580 clen = MAX_MAP_CHUNK-slop;
581 mapaddr = ramdisk_image & PAGE_MASK;
582 p = early_ioremap(mapaddr, clen+slop);
583 memcpy(q, p+slop, clen);
584 early_iounmap(p, clen+slop);
586 ramdisk_image += clen;
587 ramdisk_size -= clen;
591 #endif /* CONFIG_BLK_DEV_INITRD */
593 void __init setup_bootmem_allocator(void)
595 unsigned long bootmap_size;
597 * Initialize the boot-time allocator (with low memory only):
599 bootmap_size = init_bootmem(min_low_pfn, max_low_pfn);
601 register_bootmem_low_pages(max_low_pfn);
604 * Reserve the bootmem bitmap itself as well. We do this in two
605 * steps (first step was init_bootmem()) because this catches
606 * the (very unlikely) case of us accidentally initializing the
607 * bootmem allocator with an invalid RAM area.
609 reserve_bootmem(__pa_symbol(_text), (PFN_PHYS(min_low_pfn) +
610 bootmap_size + PAGE_SIZE-1) - __pa_symbol(_text),
614 * reserve physical page 0 - it's a special BIOS page on many boxes,
615 * enabling clean reboots, SMP operation, laptop functions.
617 reserve_bootmem(0, PAGE_SIZE, BOOTMEM_DEFAULT);
619 /* reserve EBDA region, it's a 4K region */
620 reserve_ebda_region();
622 /* could be an AMD 768MPX chipset. Reserve a page before VGA to prevent
623 PCI prefetch into it (errata #56). Usually the page is reserved anyways,
624 unless you have no PS/2 mouse plugged in. */
625 if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD &&
626 boot_cpu_data.x86 == 6)
627 reserve_bootmem(0xa0000 - 4096, 4096, BOOTMEM_DEFAULT);
631 * But first pinch a few for the stack/trampoline stuff
632 * FIXME: Don't need the extra page at 4K, but need to fix
633 * trampoline before removing it. (see the GDT stuff)
635 reserve_bootmem(PAGE_SIZE, PAGE_SIZE, BOOTMEM_DEFAULT);
637 #ifdef CONFIG_ACPI_SLEEP
639 * Reserve low memory region for sleep support.
641 acpi_reserve_bootmem();
643 #ifdef CONFIG_X86_FIND_SMP_CONFIG
645 * Find and reserve possible boot-time SMP configuration:
649 #ifdef CONFIG_BLK_DEV_INITRD
653 reserve_crashkernel();
657 * The node 0 pgdat is initialized before all of these because
658 * it's needed for bootmem. node>0 pgdats have their virtual
659 * space allocated before the pagetables are in place to access
660 * them, so they can't be cleared then.
662 * This should all compile down to nothing when NUMA is off.
664 static void __init remapped_pgdat_init(void)
668 for_each_online_node(nid) {
670 memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
675 static void set_mca_bus(int x)
680 static void set_mca_bus(int x) { }
683 /* Overridden in paravirt.c if CONFIG_PARAVIRT */
684 char * __init __attribute__((weak)) memory_setup(void)
686 return machine_specific_memory_setup();
690 * Determine if we were loaded by an EFI loader. If so, then we have also been
691 * passed the efi memmap, systab, etc., so we should use these data structures
692 * for initialization. Note, the efi init code path is determined by the
693 * global efi_enabled. This allows the same kernel image to be used on existing
694 * systems (with a traditional BIOS) as well as on EFI systems.
696 void __init setup_arch(char **cmdline_p)
698 unsigned long max_low_pfn;
700 memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
701 pre_setup_arch_hook();
703 early_ioremap_init();
706 if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
711 ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
712 screen_info = boot_params.screen_info;
713 edid_info = boot_params.edid_info;
714 apm_info.bios = boot_params.apm_bios_info;
715 ist_info = boot_params.ist_info;
716 saved_videomode = boot_params.hdr.vid_mode;
717 if( boot_params.sys_desc_table.length != 0 ) {
718 set_mca_bus(boot_params.sys_desc_table.table[3] & 0x2);
719 machine_id = boot_params.sys_desc_table.table[0];
720 machine_submodel_id = boot_params.sys_desc_table.table[1];
721 BIOS_revision = boot_params.sys_desc_table.table[2];
723 bootloader_type = boot_params.hdr.type_of_loader;
725 #ifdef CONFIG_BLK_DEV_RAM
726 rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
727 rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
728 rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
732 printk(KERN_INFO "BIOS-provided physical RAM map:\n");
733 print_memory_map(memory_setup());
737 if (!boot_params.hdr.root_flags)
738 root_mountflags &= ~MS_RDONLY;
739 init_mm.start_code = (unsigned long) _text;
740 init_mm.end_code = (unsigned long) _etext;
741 init_mm.end_data = (unsigned long) _edata;
742 init_mm.brk = init_pg_tables_end + PAGE_OFFSET;
744 code_resource.start = virt_to_phys(_text);
745 code_resource.end = virt_to_phys(_etext)-1;
746 data_resource.start = virt_to_phys(_etext);
747 data_resource.end = virt_to_phys(_edata)-1;
748 bss_resource.start = virt_to_phys(&__bss_start);
749 bss_resource.end = virt_to_phys(&__bss_stop)-1;
753 if (user_defined_memmap) {
754 printk(KERN_INFO "user-defined physical RAM map:\n");
755 print_memory_map("user");
758 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
759 *cmdline_p = command_line;
764 max_low_pfn = setup_memory();
766 /* update e820 for memory not covered by WB MTRRs */
768 if (mtrr_trim_uncached_memory(max_pfn))
769 max_low_pfn = setup_memory();
773 * Must be after max_low_pfn is determined, and before kernel
774 * pagetables are setup.
780 * NOTE: before this point _nobody_ is allowed to allocate
781 * any memory using the bootmem allocator. Although the
782 * allocator is now initialised only the first 8Mb of the kernel
783 * virtual address space has been mapped. All allocations before
784 * paging_init() has completed must use the alloc_bootmem_low_pages()
785 * variant (which allocates DMA'able memory) and care must be taken
786 * not to exceed the 8Mb limit.
790 smp_alloc_memory(); /* AP processor realmode stacks in low memory*/
795 * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
798 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
799 if (init_ohci1394_dma_early)
800 init_ohci1394_dma_on_all_controllers();
803 remapped_pgdat_init();
808 * NOTE: at this point the bootmem allocator is fully available.
811 #ifdef CONFIG_BLK_DEV_INITRD
815 paravirt_post_allocator_init();
821 #ifdef CONFIG_X86_GENERICARCH
822 generic_apic_probe();
827 * Parse the ACPI tables for possible boot-time SMP configuration.
829 acpi_boot_table_init();
837 #if defined(CONFIG_SMP) && defined(CONFIG_X86_PC)
839 printk(KERN_WARNING "More than 8 CPUs detected and "
840 "CONFIG_X86_PC cannot handle it.\nUse "
841 "CONFIG_X86_GENERICARCH or CONFIG_X86_BIGSMP.\n");
844 #ifdef CONFIG_X86_LOCAL_APIC
845 if (smp_found_config)
849 e820_register_memory();
850 e820_mark_nosave_regions();
853 #if defined(CONFIG_VGA_CONSOLE)
854 if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
855 conswitchp = &vga_con;
856 #elif defined(CONFIG_DUMMY_CONSOLE)
857 conswitchp = &dummy_con;
863 * Request address space for all standard resources
865 * This is called just before pcibios_init(), which is also a
866 * subsys_initcall, but is linked in later (in arch/i386/pci/common.c).
868 static int __init request_standard_resources(void)
872 printk(KERN_INFO "Setting up standard PCI resources\n");
873 init_iomem_resources(&code_resource, &data_resource, &bss_resource);
875 request_resource(&iomem_resource, &video_ram_resource);
877 /* request I/O space for devices used on all i[345]86 PCs */
878 for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
879 request_resource(&ioport_resource, &standard_io_resources[i]);
883 subsys_initcall(request_standard_resources);