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>
51 #include <video/edid.h>
56 #include <asm/mpspec.h>
57 #include <asm/mmzone.h>
58 #include <asm/setup.h>
59 #include <asm/arch_hooks.h>
60 #include <asm/sections.h>
61 #include <asm/io_apic.h>
65 #include <setup_arch.h>
66 #include <asm/bios_ebda.h>
67 #include <asm/cacheflush.h>
68 #include <asm/processor.h>
70 /* This value is set up by the early boot code to point to the value
71 immediately after the boot time page tables. It contains a *physical*
72 address, and must not be in the .bss segment! */
73 unsigned long init_pg_tables_end __initdata = ~0UL;
78 static struct resource data_resource = {
79 .name = "Kernel data",
82 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
85 static struct resource code_resource = {
86 .name = "Kernel code",
89 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
92 static struct resource bss_resource = {
96 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
99 static struct resource video_ram_resource = {
100 .name = "Video RAM area",
103 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
106 static struct resource standard_io_resources[] = { {
110 .flags = IORESOURCE_BUSY | IORESOURCE_IO
115 .flags = IORESOURCE_BUSY | IORESOURCE_IO
120 .flags = IORESOURCE_BUSY | IORESOURCE_IO
125 .flags = IORESOURCE_BUSY | IORESOURCE_IO
130 .flags = IORESOURCE_BUSY | IORESOURCE_IO
132 .name = "dma page reg",
135 .flags = IORESOURCE_BUSY | IORESOURCE_IO
140 .flags = IORESOURCE_BUSY | IORESOURCE_IO
145 .flags = IORESOURCE_BUSY | IORESOURCE_IO
150 .flags = IORESOURCE_BUSY | IORESOURCE_IO
153 /* cpu data as detected by the assembly code in head.S */
154 struct cpuinfo_x86 new_cpu_data __cpuinitdata = { 0, 0, 0, 0, -1, 1, 0, 0, -1 };
155 /* common cpu data for all cpus */
156 struct cpuinfo_x86 boot_cpu_data __read_mostly = { 0, 0, 0, 0, -1, 1, 0, 0, -1 };
157 EXPORT_SYMBOL(boot_cpu_data);
159 unsigned int def_to_bigsmp;
161 #ifndef CONFIG_X86_PAE
162 unsigned long mmu_cr4_features;
164 unsigned long mmu_cr4_features = X86_CR4_PAE;
167 /* for MCA, but anyone else can use it if they want */
168 unsigned int machine_id;
169 unsigned int machine_submodel_id;
170 unsigned int BIOS_revision;
172 /* Boot loader ID as an integer, for the benefit of proc_dointvec */
175 /* user-defined highmem size */
176 static unsigned int highmem_pages = -1;
181 struct screen_info screen_info;
182 EXPORT_SYMBOL(screen_info);
183 struct apm_info apm_info;
184 EXPORT_SYMBOL(apm_info);
185 struct edid_info edid_info;
186 EXPORT_SYMBOL_GPL(edid_info);
187 struct ist_info ist_info;
188 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
189 defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
190 EXPORT_SYMBOL(ist_info);
193 extern void early_cpu_init(void);
194 extern int root_mountflags;
196 unsigned long saved_video_mode;
198 #define RAMDISK_IMAGE_START_MASK 0x07FF
199 #define RAMDISK_PROMPT_FLAG 0x8000
200 #define RAMDISK_LOAD_FLAG 0x4000
202 static char __initdata command_line[COMMAND_LINE_SIZE];
204 #ifndef CONFIG_DEBUG_BOOT_PARAMS
205 struct boot_params __initdata boot_params;
207 struct boot_params boot_params;
210 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
212 #ifdef CONFIG_EDD_MODULE
216 * copy_edd() - Copy the BIOS EDD information
217 * from boot_params into a safe place.
220 static inline void copy_edd(void)
222 memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer,
223 sizeof(edd.mbr_signature));
224 memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
225 edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
226 edd.edd_info_nr = boot_params.eddbuf_entries;
229 static inline void copy_edd(void)
234 int __initdata user_defined_memmap;
237 * "mem=nopentium" disables the 4MB page tables.
238 * "mem=XXX[kKmM]" defines a memory region from HIGH_MEM
239 * to <mem>, overriding the bios size.
240 * "memmap=XXX[KkmM]@XXX[KkmM]" defines a memory region from
241 * <start> to <start>+<mem>, overriding the bios size.
243 * HPA tells me bootloaders need to parse mem=, so no new
244 * option should be mem= [also see Documentation/i386/boot.txt]
246 static int __init parse_mem(char *arg)
251 if (strcmp(arg, "nopentium") == 0) {
252 setup_clear_cpu_cap(X86_FEATURE_PSE);
254 /* If the user specifies memory size, we
255 * limit the BIOS-provided memory map to
256 * that size. exactmap can be used to specify
257 * the exact map. mem=number can be used to
258 * trim the existing memory map.
260 unsigned long long mem_size;
262 mem_size = memparse(arg, &arg);
263 limit_regions(mem_size);
264 user_defined_memmap = 1;
268 early_param("mem", parse_mem);
270 #ifdef CONFIG_PROC_VMCORE
271 /* elfcorehdr= specifies the location of elf core header
272 * stored by the crashed kernel.
274 static int __init parse_elfcorehdr(char *arg)
279 elfcorehdr_addr = memparse(arg, &arg);
282 early_param("elfcorehdr", parse_elfcorehdr);
283 #endif /* CONFIG_PROC_VMCORE */
286 * highmem=size forces highmem to be exactly 'size' bytes.
287 * This works even on boxes that have no highmem otherwise.
288 * This also works to reduce highmem size on bigger boxes.
290 static int __init parse_highmem(char *arg)
295 highmem_pages = memparse(arg, &arg) >> PAGE_SHIFT;
298 early_param("highmem", parse_highmem);
301 * vmalloc=size forces the vmalloc area to be exactly 'size'
302 * bytes. This can be used to increase (or decrease) the
303 * vmalloc area - the default is 128m.
305 static int __init parse_vmalloc(char *arg)
310 __VMALLOC_RESERVE = memparse(arg, &arg);
313 early_param("vmalloc", parse_vmalloc);
316 * reservetop=size reserves a hole at the top of the kernel address space which
317 * a hypervisor can load into later. Needed for dynamically loaded hypervisors,
318 * so relocating the fixmap can be done before paging initialization.
320 static int __init parse_reservetop(char *arg)
322 unsigned long address;
327 address = memparse(arg, &arg);
328 reserve_top_address(address);
331 early_param("reservetop", parse_reservetop);
334 * Determine low and high memory ranges:
336 unsigned long __init find_max_low_pfn(void)
338 unsigned long max_low_pfn;
340 max_low_pfn = max_pfn;
341 if (max_low_pfn > MAXMEM_PFN) {
342 if (highmem_pages == -1)
343 highmem_pages = max_pfn - MAXMEM_PFN;
344 if (highmem_pages + MAXMEM_PFN < max_pfn)
345 max_pfn = MAXMEM_PFN + highmem_pages;
346 if (highmem_pages + MAXMEM_PFN > max_pfn) {
347 printk("only %luMB highmem pages available, ignoring highmem size of %uMB.\n", pages_to_mb(max_pfn - MAXMEM_PFN), pages_to_mb(highmem_pages));
350 max_low_pfn = MAXMEM_PFN;
351 #ifndef CONFIG_HIGHMEM
352 /* Maximum memory usable is what is directly addressable */
353 printk(KERN_WARNING "Warning only %ldMB will be used.\n",
355 if (max_pfn > MAX_NONPAE_PFN)
356 printk(KERN_WARNING "Use a HIGHMEM64G enabled kernel.\n");
358 printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n");
359 max_pfn = MAXMEM_PFN;
360 #else /* !CONFIG_HIGHMEM */
361 #ifndef CONFIG_HIGHMEM64G
362 if (max_pfn > MAX_NONPAE_PFN) {
363 max_pfn = MAX_NONPAE_PFN;
364 printk(KERN_WARNING "Warning only 4GB will be used.\n");
365 printk(KERN_WARNING "Use a HIGHMEM64G enabled kernel.\n");
367 #endif /* !CONFIG_HIGHMEM64G */
368 #endif /* !CONFIG_HIGHMEM */
370 if (highmem_pages == -1)
372 #ifdef CONFIG_HIGHMEM
373 if (highmem_pages >= max_pfn) {
374 printk(KERN_ERR "highmem size specified (%uMB) is bigger than pages available (%luMB)!.\n", pages_to_mb(highmem_pages), pages_to_mb(max_pfn));
378 if (max_low_pfn-highmem_pages < 64*1024*1024/PAGE_SIZE){
379 printk(KERN_ERR "highmem size %uMB results in smaller than 64MB lowmem, ignoring it.\n", pages_to_mb(highmem_pages));
382 max_low_pfn -= highmem_pages;
386 printk(KERN_ERR "ignoring highmem size on non-highmem kernel!\n");
392 #define BIOS_EBDA_SEGMENT 0x40E
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 = *(unsigned short *)__va(BIOS_EBDA_SEGMENT);
426 /* Fixup: bios puts an EBDA in the top 64K segment */
427 /* of conventional memory, but does not adjust lowmem. */
428 if ((lowmem - ebda_addr) <= 0x10000)
431 /* Fixup: bios does not report an EBDA at all. */
432 /* Some old Dells seem to need 4k anyhow (bugzilla 2990) */
433 if ((ebda_addr == 0) && (lowmem >= 0x9f000))
436 /* Paranoia: should never happen, but... */
437 if ((lowmem == 0) || (lowmem >= 0x100000))
440 /* reserve all memory between lowmem and the 1MB mark */
441 reserve_bootmem(lowmem, 0x100000 - lowmem, BOOTMEM_DEFAULT);
444 #ifndef CONFIG_NEED_MULTIPLE_NODES
445 static void __init setup_bootmem_allocator(void);
446 static unsigned long __init setup_memory(void)
449 * partially used pages are not usable - thus
450 * we are rounding upwards:
452 min_low_pfn = PFN_UP(init_pg_tables_end);
454 max_low_pfn = find_max_low_pfn();
456 #ifdef CONFIG_HIGHMEM
457 highstart_pfn = highend_pfn = max_pfn;
458 if (max_pfn > max_low_pfn) {
459 highstart_pfn = max_low_pfn;
461 printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
462 pages_to_mb(highend_pfn - highstart_pfn));
463 num_physpages = highend_pfn;
464 high_memory = (void *) __va(highstart_pfn * PAGE_SIZE - 1) + 1;
466 num_physpages = max_low_pfn;
467 high_memory = (void *) __va(max_low_pfn * PAGE_SIZE - 1) + 1;
469 #ifdef CONFIG_FLATMEM
470 max_mapnr = num_physpages;
472 printk(KERN_NOTICE "%ldMB LOWMEM available.\n",
473 pages_to_mb(max_low_pfn));
475 setup_bootmem_allocator();
480 static void __init zone_sizes_init(void)
482 unsigned long max_zone_pfns[MAX_NR_ZONES];
483 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
484 max_zone_pfns[ZONE_DMA] =
485 virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
486 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
487 #ifdef CONFIG_HIGHMEM
488 max_zone_pfns[ZONE_HIGHMEM] = highend_pfn;
489 add_active_range(0, 0, highend_pfn);
491 add_active_range(0, 0, max_low_pfn);
494 free_area_init_nodes(max_zone_pfns);
497 extern unsigned long __init setup_memory(void);
498 extern void zone_sizes_init(void);
499 #endif /* !CONFIG_NEED_MULTIPLE_NODES */
501 static inline unsigned long long get_total_mem(void)
503 unsigned long long total;
505 total = max_low_pfn - min_low_pfn;
506 #ifdef CONFIG_HIGHMEM
507 total += highend_pfn - highstart_pfn;
510 return total << PAGE_SHIFT;
514 static void __init reserve_crashkernel(void)
516 unsigned long long total_mem;
517 unsigned long long crash_size, crash_base;
520 total_mem = get_total_mem();
522 ret = parse_crashkernel(boot_command_line, total_mem,
523 &crash_size, &crash_base);
524 if (ret == 0 && crash_size > 0) {
525 if (crash_base > 0) {
526 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
527 "for crashkernel (System RAM: %ldMB)\n",
528 (unsigned long)(crash_size >> 20),
529 (unsigned long)(crash_base >> 20),
530 (unsigned long)(total_mem >> 20));
531 crashk_res.start = crash_base;
532 crashk_res.end = crash_base + crash_size - 1;
533 reserve_bootmem(crash_base, crash_size,
536 printk(KERN_INFO "crashkernel reservation failed - "
537 "you have to specify a base address\n");
541 static inline void __init reserve_crashkernel(void)
545 #ifdef CONFIG_BLK_DEV_INITRD
547 static bool do_relocate_initrd = false;
549 static void __init reserve_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 ramdisk_end = ramdisk_image + ramdisk_size;
554 unsigned long end_of_lowmem = max_low_pfn << PAGE_SHIFT;
555 unsigned long ramdisk_here;
559 if (!boot_params.hdr.type_of_loader ||
560 !ramdisk_image || !ramdisk_size)
561 return; /* No initrd provided by bootloader */
563 if (ramdisk_end < ramdisk_image) {
564 printk(KERN_ERR "initrd wraps around end of memory, "
565 "disabling initrd\n");
568 if (ramdisk_size >= end_of_lowmem/2) {
569 printk(KERN_ERR "initrd too large to handle, "
570 "disabling initrd\n");
573 if (ramdisk_end <= end_of_lowmem) {
574 /* All in lowmem, easy case */
575 reserve_bootmem(ramdisk_image, ramdisk_size, BOOTMEM_DEFAULT);
576 initrd_start = ramdisk_image + PAGE_OFFSET;
577 initrd_end = initrd_start+ramdisk_size;
581 /* We need to move the initrd down into lowmem */
582 ramdisk_here = (end_of_lowmem - ramdisk_size) & PAGE_MASK;
584 /* Note: this includes all the lowmem currently occupied by
585 the initrd, we rely on that fact to keep the data intact. */
586 reserve_bootmem(ramdisk_here, ramdisk_size, BOOTMEM_DEFAULT);
587 initrd_start = ramdisk_here + PAGE_OFFSET;
588 initrd_end = initrd_start + ramdisk_size;
590 do_relocate_initrd = true;
593 #define MAX_MAP_CHUNK (NR_FIX_BTMAPS << PAGE_SHIFT)
595 static void __init relocate_initrd(void)
597 unsigned long ramdisk_image = boot_params.hdr.ramdisk_image;
598 unsigned long ramdisk_size = boot_params.hdr.ramdisk_size;
599 unsigned long end_of_lowmem = max_low_pfn << PAGE_SHIFT;
600 unsigned long ramdisk_here;
601 unsigned long slop, clen, mapaddr;
604 if (!do_relocate_initrd)
607 ramdisk_here = initrd_start - PAGE_OFFSET;
609 q = (char *)initrd_start;
611 /* Copy any lowmem portion of the initrd */
612 if (ramdisk_image < end_of_lowmem) {
613 clen = end_of_lowmem - ramdisk_image;
614 p = (char *)__va(ramdisk_image);
617 ramdisk_image += clen;
618 ramdisk_size -= clen;
621 /* Copy the highmem portion of the initrd */
622 while (ramdisk_size) {
623 slop = ramdisk_image & ~PAGE_MASK;
625 if (clen > MAX_MAP_CHUNK-slop)
626 clen = MAX_MAP_CHUNK-slop;
627 mapaddr = ramdisk_image & PAGE_MASK;
628 p = early_ioremap(mapaddr, clen+slop);
629 memcpy(q, p+slop, clen);
630 early_iounmap(p, clen+slop);
632 ramdisk_image += clen;
633 ramdisk_size -= clen;
637 #endif /* CONFIG_BLK_DEV_INITRD */
639 void __init setup_bootmem_allocator(void)
641 unsigned long bootmap_size;
643 * Initialize the boot-time allocator (with low memory only):
645 bootmap_size = init_bootmem(min_low_pfn, max_low_pfn);
647 register_bootmem_low_pages(max_low_pfn);
650 * Reserve the bootmem bitmap itself as well. We do this in two
651 * steps (first step was init_bootmem()) because this catches
652 * the (very unlikely) case of us accidentally initializing the
653 * bootmem allocator with an invalid RAM area.
655 reserve_bootmem(__pa_symbol(_text), (PFN_PHYS(min_low_pfn) +
656 bootmap_size + PAGE_SIZE-1) - __pa_symbol(_text),
660 * reserve physical page 0 - it's a special BIOS page on many boxes,
661 * enabling clean reboots, SMP operation, laptop functions.
663 reserve_bootmem(0, PAGE_SIZE, BOOTMEM_DEFAULT);
665 /* reserve EBDA region */
666 reserve_ebda_region();
670 * But first pinch a few for the stack/trampoline stuff
671 * FIXME: Don't need the extra page at 4K, but need to fix
672 * trampoline before removing it. (see the GDT stuff)
674 reserve_bootmem(PAGE_SIZE, PAGE_SIZE, BOOTMEM_DEFAULT);
676 #ifdef CONFIG_ACPI_SLEEP
678 * Reserve low memory region for sleep support.
680 acpi_reserve_bootmem();
682 #ifdef CONFIG_X86_FIND_SMP_CONFIG
684 * Find and reserve possible boot-time SMP configuration:
688 #ifdef CONFIG_BLK_DEV_INITRD
692 reserve_crashkernel();
694 reserve_ibft_region();
698 * The node 0 pgdat is initialized before all of these because
699 * it's needed for bootmem. node>0 pgdats have their virtual
700 * space allocated before the pagetables are in place to access
701 * them, so they can't be cleared then.
703 * This should all compile down to nothing when NUMA is off.
705 static void __init remapped_pgdat_init(void)
709 for_each_online_node(nid) {
711 memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
716 static void set_mca_bus(int x)
721 static void set_mca_bus(int x) { }
724 /* Overridden in paravirt.c if CONFIG_PARAVIRT */
725 char * __init __attribute__((weak)) memory_setup(void)
727 return machine_specific_memory_setup();
732 * In the golden day, when everything among i386 and x86_64 will be
733 * integrated, this will not live here
735 void *x86_cpu_to_node_map_early_ptr;
736 int x86_cpu_to_node_map_init[NR_CPUS] = {
737 [0 ... NR_CPUS-1] = NUMA_NO_NODE
739 DEFINE_PER_CPU(int, x86_cpu_to_node_map) = NUMA_NO_NODE;
743 * Determine if we were loaded by an EFI loader. If so, then we have also been
744 * passed the efi memmap, systab, etc., so we should use these data structures
745 * for initialization. Note, the efi init code path is determined by the
746 * global efi_enabled. This allows the same kernel image to be used on existing
747 * systems (with a traditional BIOS) as well as on EFI systems.
749 void __init setup_arch(char **cmdline_p)
751 unsigned long max_low_pfn;
753 memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
754 pre_setup_arch_hook();
756 early_ioremap_init();
759 if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
764 ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
765 screen_info = boot_params.screen_info;
766 edid_info = boot_params.edid_info;
767 apm_info.bios = boot_params.apm_bios_info;
768 ist_info = boot_params.ist_info;
769 saved_video_mode = boot_params.hdr.vid_mode;
770 if( boot_params.sys_desc_table.length != 0 ) {
771 set_mca_bus(boot_params.sys_desc_table.table[3] & 0x2);
772 machine_id = boot_params.sys_desc_table.table[0];
773 machine_submodel_id = boot_params.sys_desc_table.table[1];
774 BIOS_revision = boot_params.sys_desc_table.table[2];
776 bootloader_type = boot_params.hdr.type_of_loader;
778 #ifdef CONFIG_BLK_DEV_RAM
779 rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
780 rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
781 rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
785 printk(KERN_INFO "BIOS-provided physical RAM map:\n");
786 print_memory_map(memory_setup());
790 if (!boot_params.hdr.root_flags)
791 root_mountflags &= ~MS_RDONLY;
792 init_mm.start_code = (unsigned long) _text;
793 init_mm.end_code = (unsigned long) _etext;
794 init_mm.end_data = (unsigned long) _edata;
795 init_mm.brk = init_pg_tables_end + PAGE_OFFSET;
797 code_resource.start = virt_to_phys(_text);
798 code_resource.end = virt_to_phys(_etext)-1;
799 data_resource.start = virt_to_phys(_etext);
800 data_resource.end = virt_to_phys(_edata)-1;
801 bss_resource.start = virt_to_phys(&__bss_start);
802 bss_resource.end = virt_to_phys(&__bss_stop)-1;
806 if (user_defined_memmap) {
807 printk(KERN_INFO "user-defined physical RAM map:\n");
808 print_memory_map("user");
811 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
812 *cmdline_p = command_line;
817 /* update e820 for memory not covered by WB MTRRs */
818 propagate_e820_map();
820 if (mtrr_trim_uncached_memory(max_pfn))
821 propagate_e820_map();
823 max_low_pfn = setup_memory();
827 * Must be after max_low_pfn is determined, and before kernel
828 * pagetables are setup.
834 * NOTE: before this point _nobody_ is allowed to allocate
835 * any memory using the bootmem allocator. Although the
836 * allocator is now initialised only the first 8Mb of the kernel
837 * virtual address space has been mapped. All allocations before
838 * paging_init() has completed must use the alloc_bootmem_low_pages()
839 * variant (which allocates DMA'able memory) and care must be taken
840 * not to exceed the 8Mb limit.
844 smp_alloc_memory(); /* AP processor realmode stacks in low memory*/
849 * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
852 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
853 if (init_ohci1394_dma_early)
854 init_ohci1394_dma_on_all_controllers();
857 remapped_pgdat_init();
862 * NOTE: at this point the bootmem allocator is fully available.
865 #ifdef CONFIG_BLK_DEV_INITRD
869 paravirt_post_allocator_init();
875 #ifdef CONFIG_X86_SMP
877 * setup to use the early static init tables during kernel startup
878 * X86_SMP will exclude sub-arches that don't deal well with it.
880 x86_cpu_to_apicid_early_ptr = (void *)x86_cpu_to_apicid_init;
881 x86_bios_cpu_apicid_early_ptr = (void *)x86_bios_cpu_apicid_init;
883 x86_cpu_to_node_map_early_ptr = (void *)x86_cpu_to_node_map_init;
887 #ifdef CONFIG_X86_GENERICARCH
888 generic_apic_probe();
893 * Parse the ACPI tables for possible boot-time SMP configuration.
895 acpi_boot_table_init();
903 #if defined(CONFIG_SMP) && defined(CONFIG_X86_PC)
905 printk(KERN_WARNING "More than 8 CPUs detected and "
906 "CONFIG_X86_PC cannot handle it.\nUse "
907 "CONFIG_X86_GENERICARCH or CONFIG_X86_BIGSMP.\n");
910 #ifdef CONFIG_X86_LOCAL_APIC
911 if (smp_found_config)
915 e820_register_memory();
916 e820_mark_nosave_regions();
919 #if defined(CONFIG_VGA_CONSOLE)
920 if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
921 conswitchp = &vga_con;
922 #elif defined(CONFIG_DUMMY_CONSOLE)
923 conswitchp = &dummy_con;
929 * Request address space for all standard resources
931 * This is called just before pcibios_init(), which is also a
932 * subsys_initcall, but is linked in later (in arch/i386/pci/common.c).
934 static int __init request_standard_resources(void)
938 printk(KERN_INFO "Setting up standard PCI resources\n");
939 init_iomem_resources(&code_resource, &data_resource, &bss_resource);
941 request_resource(&iomem_resource, &video_ram_resource);
943 /* request I/O space for devices used on all i[345]86 PCs */
944 for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
945 request_resource(&ioport_resource, &standard_io_resources[i]);
949 subsys_initcall(request_standard_resources);