Linux 2.6.25-rc4
[linux-2.6/next.git] / arch / x86 / kernel / setup_32.c
bloba1d7071a51c91c472d4c2926018906dd47e31344
1 /*
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>
25 #include <linux/mm.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>
52 #include <asm/mtrr.h>
53 #include <asm/apic.h>
54 #include <asm/e820.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>
61 #include <asm/ist.h>
62 #include <asm/io.h>
63 #include <asm/vmi.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;
74 * Machine setup..
76 static struct resource data_resource = {
77 .name = "Kernel data",
78 .start = 0,
79 .end = 0,
80 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
83 static struct resource code_resource = {
84 .name = "Kernel code",
85 .start = 0,
86 .end = 0,
87 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
90 static struct resource bss_resource = {
91 .name = "Kernel bss",
92 .start = 0,
93 .end = 0,
94 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
97 static struct resource video_ram_resource = {
98 .name = "Video RAM area",
99 .start = 0xa0000,
100 .end = 0xbffff,
101 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
104 static struct resource standard_io_resources[] = { {
105 .name = "dma1",
106 .start = 0x0000,
107 .end = 0x001f,
108 .flags = IORESOURCE_BUSY | IORESOURCE_IO
109 }, {
110 .name = "pic1",
111 .start = 0x0020,
112 .end = 0x0021,
113 .flags = IORESOURCE_BUSY | IORESOURCE_IO
114 }, {
115 .name = "timer0",
116 .start = 0x0040,
117 .end = 0x0043,
118 .flags = IORESOURCE_BUSY | IORESOURCE_IO
119 }, {
120 .name = "timer1",
121 .start = 0x0050,
122 .end = 0x0053,
123 .flags = IORESOURCE_BUSY | IORESOURCE_IO
124 }, {
125 .name = "keyboard",
126 .start = 0x0060,
127 .end = 0x006f,
128 .flags = IORESOURCE_BUSY | IORESOURCE_IO
129 }, {
130 .name = "dma page reg",
131 .start = 0x0080,
132 .end = 0x008f,
133 .flags = IORESOURCE_BUSY | IORESOURCE_IO
134 }, {
135 .name = "pic2",
136 .start = 0x00a0,
137 .end = 0x00a1,
138 .flags = IORESOURCE_BUSY | IORESOURCE_IO
139 }, {
140 .name = "dma2",
141 .start = 0x00c0,
142 .end = 0x00df,
143 .flags = IORESOURCE_BUSY | IORESOURCE_IO
144 }, {
145 .name = "fpu",
146 .start = 0x00f0,
147 .end = 0x00ff,
148 .flags = IORESOURCE_BUSY | IORESOURCE_IO
149 } };
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 #ifndef CONFIG_X86_PAE
158 unsigned long mmu_cr4_features;
159 #else
160 unsigned long mmu_cr4_features = X86_CR4_PAE;
161 #endif
163 /* for MCA, but anyone else can use it if they want */
164 unsigned int machine_id;
165 unsigned int machine_submodel_id;
166 unsigned int BIOS_revision;
168 /* Boot loader ID as an integer, for the benefit of proc_dointvec */
169 int bootloader_type;
171 /* user-defined highmem size */
172 static unsigned int highmem_pages = -1;
175 * Setup options
177 struct screen_info screen_info;
178 EXPORT_SYMBOL(screen_info);
179 struct apm_info apm_info;
180 EXPORT_SYMBOL(apm_info);
181 struct edid_info edid_info;
182 EXPORT_SYMBOL_GPL(edid_info);
183 struct ist_info ist_info;
184 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
185 defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
186 EXPORT_SYMBOL(ist_info);
187 #endif
189 extern void early_cpu_init(void);
190 extern int root_mountflags;
192 unsigned long saved_videomode;
194 #define RAMDISK_IMAGE_START_MASK 0x07FF
195 #define RAMDISK_PROMPT_FLAG 0x8000
196 #define RAMDISK_LOAD_FLAG 0x4000
198 static char __initdata command_line[COMMAND_LINE_SIZE];
200 #ifndef CONFIG_DEBUG_BOOT_PARAMS
201 struct boot_params __initdata boot_params;
202 #else
203 struct boot_params boot_params;
204 #endif
206 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
207 struct edd edd;
208 #ifdef CONFIG_EDD_MODULE
209 EXPORT_SYMBOL(edd);
210 #endif
212 * copy_edd() - Copy the BIOS EDD information
213 * from boot_params into a safe place.
216 static inline void copy_edd(void)
218 memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer,
219 sizeof(edd.mbr_signature));
220 memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
221 edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
222 edd.edd_info_nr = boot_params.eddbuf_entries;
224 #else
225 static inline void copy_edd(void)
228 #endif
230 int __initdata user_defined_memmap = 0;
233 * "mem=nopentium" disables the 4MB page tables.
234 * "mem=XXX[kKmM]" defines a memory region from HIGH_MEM
235 * to <mem>, overriding the bios size.
236 * "memmap=XXX[KkmM]@XXX[KkmM]" defines a memory region from
237 * <start> to <start>+<mem>, overriding the bios size.
239 * HPA tells me bootloaders need to parse mem=, so no new
240 * option should be mem= [also see Documentation/i386/boot.txt]
242 static int __init parse_mem(char *arg)
244 if (!arg)
245 return -EINVAL;
247 if (strcmp(arg, "nopentium") == 0) {
248 setup_clear_cpu_cap(X86_FEATURE_PSE);
249 } else {
250 /* If the user specifies memory size, we
251 * limit the BIOS-provided memory map to
252 * that size. exactmap can be used to specify
253 * the exact map. mem=number can be used to
254 * trim the existing memory map.
256 unsigned long long mem_size;
258 mem_size = memparse(arg, &arg);
259 limit_regions(mem_size);
260 user_defined_memmap = 1;
262 return 0;
264 early_param("mem", parse_mem);
266 #ifdef CONFIG_PROC_VMCORE
267 /* elfcorehdr= specifies the location of elf core header
268 * stored by the crashed kernel.
270 static int __init parse_elfcorehdr(char *arg)
272 if (!arg)
273 return -EINVAL;
275 elfcorehdr_addr = memparse(arg, &arg);
276 return 0;
278 early_param("elfcorehdr", parse_elfcorehdr);
279 #endif /* CONFIG_PROC_VMCORE */
282 * highmem=size forces highmem to be exactly 'size' bytes.
283 * This works even on boxes that have no highmem otherwise.
284 * This also works to reduce highmem size on bigger boxes.
286 static int __init parse_highmem(char *arg)
288 if (!arg)
289 return -EINVAL;
291 highmem_pages = memparse(arg, &arg) >> PAGE_SHIFT;
292 return 0;
294 early_param("highmem", parse_highmem);
297 * vmalloc=size forces the vmalloc area to be exactly 'size'
298 * bytes. This can be used to increase (or decrease) the
299 * vmalloc area - the default is 128m.
301 static int __init parse_vmalloc(char *arg)
303 if (!arg)
304 return -EINVAL;
306 __VMALLOC_RESERVE = memparse(arg, &arg);
307 return 0;
309 early_param("vmalloc", parse_vmalloc);
312 * reservetop=size reserves a hole at the top of the kernel address space which
313 * a hypervisor can load into later. Needed for dynamically loaded hypervisors,
314 * so relocating the fixmap can be done before paging initialization.
316 static int __init parse_reservetop(char *arg)
318 unsigned long address;
320 if (!arg)
321 return -EINVAL;
323 address = memparse(arg, &arg);
324 reserve_top_address(address);
325 return 0;
327 early_param("reservetop", parse_reservetop);
330 * Determine low and high memory ranges:
332 unsigned long __init find_max_low_pfn(void)
334 unsigned long max_low_pfn;
336 max_low_pfn = max_pfn;
337 if (max_low_pfn > MAXMEM_PFN) {
338 if (highmem_pages == -1)
339 highmem_pages = max_pfn - MAXMEM_PFN;
340 if (highmem_pages + MAXMEM_PFN < max_pfn)
341 max_pfn = MAXMEM_PFN + highmem_pages;
342 if (highmem_pages + MAXMEM_PFN > max_pfn) {
343 printk("only %luMB highmem pages available, ignoring highmem size of %uMB.\n", pages_to_mb(max_pfn - MAXMEM_PFN), pages_to_mb(highmem_pages));
344 highmem_pages = 0;
346 max_low_pfn = MAXMEM_PFN;
347 #ifndef CONFIG_HIGHMEM
348 /* Maximum memory usable is what is directly addressable */
349 printk(KERN_WARNING "Warning only %ldMB will be used.\n",
350 MAXMEM>>20);
351 if (max_pfn > MAX_NONPAE_PFN)
352 printk(KERN_WARNING "Use a HIGHMEM64G enabled kernel.\n");
353 else
354 printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n");
355 max_pfn = MAXMEM_PFN;
356 #else /* !CONFIG_HIGHMEM */
357 #ifndef CONFIG_HIGHMEM64G
358 if (max_pfn > MAX_NONPAE_PFN) {
359 max_pfn = MAX_NONPAE_PFN;
360 printk(KERN_WARNING "Warning only 4GB will be used.\n");
361 printk(KERN_WARNING "Use a HIGHMEM64G enabled kernel.\n");
363 #endif /* !CONFIG_HIGHMEM64G */
364 #endif /* !CONFIG_HIGHMEM */
365 } else {
366 if (highmem_pages == -1)
367 highmem_pages = 0;
368 #ifdef CONFIG_HIGHMEM
369 if (highmem_pages >= max_pfn) {
370 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 highmem_pages = 0;
373 if (highmem_pages) {
374 if (max_low_pfn-highmem_pages < 64*1024*1024/PAGE_SIZE){
375 printk(KERN_ERR "highmem size %uMB results in smaller than 64MB lowmem, ignoring it.\n", pages_to_mb(highmem_pages));
376 highmem_pages = 0;
378 max_low_pfn -= highmem_pages;
380 #else
381 if (highmem_pages)
382 printk(KERN_ERR "ignoring highmem size on non-highmem kernel!\n");
383 #endif
385 return max_low_pfn;
389 * workaround for Dell systems that neglect to reserve EBDA
391 static void __init reserve_ebda_region(void)
393 unsigned int addr;
394 addr = get_bios_ebda();
395 if (addr)
396 reserve_bootmem(addr, PAGE_SIZE, BOOTMEM_DEFAULT);
399 #ifndef CONFIG_NEED_MULTIPLE_NODES
400 void __init setup_bootmem_allocator(void);
401 static unsigned long __init setup_memory(void)
404 * partially used pages are not usable - thus
405 * we are rounding upwards:
407 min_low_pfn = PFN_UP(init_pg_tables_end);
409 find_max_pfn();
411 max_low_pfn = find_max_low_pfn();
413 #ifdef CONFIG_HIGHMEM
414 highstart_pfn = highend_pfn = max_pfn;
415 if (max_pfn > max_low_pfn) {
416 highstart_pfn = max_low_pfn;
418 printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
419 pages_to_mb(highend_pfn - highstart_pfn));
420 num_physpages = highend_pfn;
421 high_memory = (void *) __va(highstart_pfn * PAGE_SIZE - 1) + 1;
422 #else
423 num_physpages = max_low_pfn;
424 high_memory = (void *) __va(max_low_pfn * PAGE_SIZE - 1) + 1;
425 #endif
426 #ifdef CONFIG_FLATMEM
427 max_mapnr = num_physpages;
428 #endif
429 printk(KERN_NOTICE "%ldMB LOWMEM available.\n",
430 pages_to_mb(max_low_pfn));
432 setup_bootmem_allocator();
434 return max_low_pfn;
437 void __init zone_sizes_init(void)
439 unsigned long max_zone_pfns[MAX_NR_ZONES];
440 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
441 max_zone_pfns[ZONE_DMA] =
442 virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
443 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
444 #ifdef CONFIG_HIGHMEM
445 max_zone_pfns[ZONE_HIGHMEM] = highend_pfn;
446 add_active_range(0, 0, highend_pfn);
447 #else
448 add_active_range(0, 0, max_low_pfn);
449 #endif
451 free_area_init_nodes(max_zone_pfns);
453 #else
454 extern unsigned long __init setup_memory(void);
455 extern void zone_sizes_init(void);
456 #endif /* !CONFIG_NEED_MULTIPLE_NODES */
458 static inline unsigned long long get_total_mem(void)
460 unsigned long long total;
462 total = max_low_pfn - min_low_pfn;
463 #ifdef CONFIG_HIGHMEM
464 total += highend_pfn - highstart_pfn;
465 #endif
467 return total << PAGE_SHIFT;
470 #ifdef CONFIG_KEXEC
471 static void __init reserve_crashkernel(void)
473 unsigned long long total_mem;
474 unsigned long long crash_size, crash_base;
475 int ret;
477 total_mem = get_total_mem();
479 ret = parse_crashkernel(boot_command_line, total_mem,
480 &crash_size, &crash_base);
481 if (ret == 0 && crash_size > 0) {
482 if (crash_base > 0) {
483 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
484 "for crashkernel (System RAM: %ldMB)\n",
485 (unsigned long)(crash_size >> 20),
486 (unsigned long)(crash_base >> 20),
487 (unsigned long)(total_mem >> 20));
488 crashk_res.start = crash_base;
489 crashk_res.end = crash_base + crash_size - 1;
490 reserve_bootmem(crash_base, crash_size,
491 BOOTMEM_DEFAULT);
492 } else
493 printk(KERN_INFO "crashkernel reservation failed - "
494 "you have to specify a base address\n");
497 #else
498 static inline void __init reserve_crashkernel(void)
500 #endif
502 #ifdef CONFIG_BLK_DEV_INITRD
504 static bool do_relocate_initrd = false;
506 static void __init reserve_initrd(void)
508 unsigned long ramdisk_image = boot_params.hdr.ramdisk_image;
509 unsigned long ramdisk_size = boot_params.hdr.ramdisk_size;
510 unsigned long ramdisk_end = ramdisk_image + ramdisk_size;
511 unsigned long end_of_lowmem = max_low_pfn << PAGE_SHIFT;
512 unsigned long ramdisk_here;
514 initrd_start = 0;
516 if (!boot_params.hdr.type_of_loader ||
517 !ramdisk_image || !ramdisk_size)
518 return; /* No initrd provided by bootloader */
520 if (ramdisk_end < ramdisk_image) {
521 printk(KERN_ERR "initrd wraps around end of memory, "
522 "disabling initrd\n");
523 return;
525 if (ramdisk_size >= end_of_lowmem/2) {
526 printk(KERN_ERR "initrd too large to handle, "
527 "disabling initrd\n");
528 return;
530 if (ramdisk_end <= end_of_lowmem) {
531 /* All in lowmem, easy case */
532 reserve_bootmem(ramdisk_image, ramdisk_size, BOOTMEM_DEFAULT);
533 initrd_start = ramdisk_image + PAGE_OFFSET;
534 initrd_end = initrd_start+ramdisk_size;
535 return;
538 /* We need to move the initrd down into lowmem */
539 ramdisk_here = (end_of_lowmem - ramdisk_size) & PAGE_MASK;
541 /* Note: this includes all the lowmem currently occupied by
542 the initrd, we rely on that fact to keep the data intact. */
543 reserve_bootmem(ramdisk_here, ramdisk_size, BOOTMEM_DEFAULT);
544 initrd_start = ramdisk_here + PAGE_OFFSET;
545 initrd_end = initrd_start + ramdisk_size;
547 do_relocate_initrd = true;
550 #define MAX_MAP_CHUNK (NR_FIX_BTMAPS << PAGE_SHIFT)
552 static void __init relocate_initrd(void)
554 unsigned long ramdisk_image = boot_params.hdr.ramdisk_image;
555 unsigned long ramdisk_size = boot_params.hdr.ramdisk_size;
556 unsigned long end_of_lowmem = max_low_pfn << PAGE_SHIFT;
557 unsigned long ramdisk_here;
558 unsigned long slop, clen, mapaddr;
559 char *p, *q;
561 if (!do_relocate_initrd)
562 return;
564 ramdisk_here = initrd_start - PAGE_OFFSET;
566 q = (char *)initrd_start;
568 /* Copy any lowmem portion of the initrd */
569 if (ramdisk_image < end_of_lowmem) {
570 clen = end_of_lowmem - ramdisk_image;
571 p = (char *)__va(ramdisk_image);
572 memcpy(q, p, clen);
573 q += clen;
574 ramdisk_image += clen;
575 ramdisk_size -= clen;
578 /* Copy the highmem portion of the initrd */
579 while (ramdisk_size) {
580 slop = ramdisk_image & ~PAGE_MASK;
581 clen = ramdisk_size;
582 if (clen > MAX_MAP_CHUNK-slop)
583 clen = MAX_MAP_CHUNK-slop;
584 mapaddr = ramdisk_image & PAGE_MASK;
585 p = early_ioremap(mapaddr, clen+slop);
586 memcpy(q, p+slop, clen);
587 early_iounmap(p, clen+slop);
588 q += clen;
589 ramdisk_image += clen;
590 ramdisk_size -= clen;
594 #endif /* CONFIG_BLK_DEV_INITRD */
596 void __init setup_bootmem_allocator(void)
598 unsigned long bootmap_size;
600 * Initialize the boot-time allocator (with low memory only):
602 bootmap_size = init_bootmem(min_low_pfn, max_low_pfn);
604 register_bootmem_low_pages(max_low_pfn);
607 * Reserve the bootmem bitmap itself as well. We do this in two
608 * steps (first step was init_bootmem()) because this catches
609 * the (very unlikely) case of us accidentally initializing the
610 * bootmem allocator with an invalid RAM area.
612 reserve_bootmem(__pa_symbol(_text), (PFN_PHYS(min_low_pfn) +
613 bootmap_size + PAGE_SIZE-1) - __pa_symbol(_text),
614 BOOTMEM_DEFAULT);
617 * reserve physical page 0 - it's a special BIOS page on many boxes,
618 * enabling clean reboots, SMP operation, laptop functions.
620 reserve_bootmem(0, PAGE_SIZE, BOOTMEM_DEFAULT);
622 /* reserve EBDA region, it's a 4K region */
623 reserve_ebda_region();
625 /* could be an AMD 768MPX chipset. Reserve a page before VGA to prevent
626 PCI prefetch into it (errata #56). Usually the page is reserved anyways,
627 unless you have no PS/2 mouse plugged in. */
628 if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD &&
629 boot_cpu_data.x86 == 6)
630 reserve_bootmem(0xa0000 - 4096, 4096, BOOTMEM_DEFAULT);
632 #ifdef CONFIG_SMP
634 * But first pinch a few for the stack/trampoline stuff
635 * FIXME: Don't need the extra page at 4K, but need to fix
636 * trampoline before removing it. (see the GDT stuff)
638 reserve_bootmem(PAGE_SIZE, PAGE_SIZE, BOOTMEM_DEFAULT);
639 #endif
640 #ifdef CONFIG_ACPI_SLEEP
642 * Reserve low memory region for sleep support.
644 acpi_reserve_bootmem();
645 #endif
646 #ifdef CONFIG_X86_FIND_SMP_CONFIG
648 * Find and reserve possible boot-time SMP configuration:
650 find_smp_config();
651 #endif
652 #ifdef CONFIG_BLK_DEV_INITRD
653 reserve_initrd();
654 #endif
655 numa_kva_reserve();
656 reserve_crashkernel();
660 * The node 0 pgdat is initialized before all of these because
661 * it's needed for bootmem. node>0 pgdats have their virtual
662 * space allocated before the pagetables are in place to access
663 * them, so they can't be cleared then.
665 * This should all compile down to nothing when NUMA is off.
667 static void __init remapped_pgdat_init(void)
669 int nid;
671 for_each_online_node(nid) {
672 if (nid != 0)
673 memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
677 #ifdef CONFIG_MCA
678 static void set_mca_bus(int x)
680 MCA_bus = x;
682 #else
683 static void set_mca_bus(int x) { }
684 #endif
686 /* Overridden in paravirt.c if CONFIG_PARAVIRT */
687 char * __init __attribute__((weak)) memory_setup(void)
689 return machine_specific_memory_setup();
693 * Determine if we were loaded by an EFI loader. If so, then we have also been
694 * passed the efi memmap, systab, etc., so we should use these data structures
695 * for initialization. Note, the efi init code path is determined by the
696 * global efi_enabled. This allows the same kernel image to be used on existing
697 * systems (with a traditional BIOS) as well as on EFI systems.
699 void __init setup_arch(char **cmdline_p)
701 unsigned long max_low_pfn;
703 memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
704 pre_setup_arch_hook();
705 early_cpu_init();
706 early_ioremap_init();
708 #ifdef CONFIG_EFI
709 if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
710 "EL32", 4))
711 efi_enabled = 1;
712 #endif
714 ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
715 screen_info = boot_params.screen_info;
716 edid_info = boot_params.edid_info;
717 apm_info.bios = boot_params.apm_bios_info;
718 ist_info = boot_params.ist_info;
719 saved_videomode = boot_params.hdr.vid_mode;
720 if( boot_params.sys_desc_table.length != 0 ) {
721 set_mca_bus(boot_params.sys_desc_table.table[3] & 0x2);
722 machine_id = boot_params.sys_desc_table.table[0];
723 machine_submodel_id = boot_params.sys_desc_table.table[1];
724 BIOS_revision = boot_params.sys_desc_table.table[2];
726 bootloader_type = boot_params.hdr.type_of_loader;
728 #ifdef CONFIG_BLK_DEV_RAM
729 rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
730 rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
731 rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
732 #endif
733 ARCH_SETUP
735 printk(KERN_INFO "BIOS-provided physical RAM map:\n");
736 print_memory_map(memory_setup());
738 copy_edd();
740 if (!boot_params.hdr.root_flags)
741 root_mountflags &= ~MS_RDONLY;
742 init_mm.start_code = (unsigned long) _text;
743 init_mm.end_code = (unsigned long) _etext;
744 init_mm.end_data = (unsigned long) _edata;
745 init_mm.brk = init_pg_tables_end + PAGE_OFFSET;
747 code_resource.start = virt_to_phys(_text);
748 code_resource.end = virt_to_phys(_etext)-1;
749 data_resource.start = virt_to_phys(_etext);
750 data_resource.end = virt_to_phys(_edata)-1;
751 bss_resource.start = virt_to_phys(&__bss_start);
752 bss_resource.end = virt_to_phys(&__bss_stop)-1;
754 parse_early_param();
756 if (user_defined_memmap) {
757 printk(KERN_INFO "user-defined physical RAM map:\n");
758 print_memory_map("user");
761 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
762 *cmdline_p = command_line;
764 if (efi_enabled)
765 efi_init();
767 max_low_pfn = setup_memory();
769 /* update e820 for memory not covered by WB MTRRs */
770 mtrr_bp_init();
771 if (mtrr_trim_uncached_memory(max_pfn))
772 max_low_pfn = setup_memory();
774 #ifdef CONFIG_VMI
776 * Must be after max_low_pfn is determined, and before kernel
777 * pagetables are setup.
779 vmi_init();
780 #endif
783 * NOTE: before this point _nobody_ is allowed to allocate
784 * any memory using the bootmem allocator. Although the
785 * allocator is now initialised only the first 8Mb of the kernel
786 * virtual address space has been mapped. All allocations before
787 * paging_init() has completed must use the alloc_bootmem_low_pages()
788 * variant (which allocates DMA'able memory) and care must be taken
789 * not to exceed the 8Mb limit.
792 #ifdef CONFIG_SMP
793 smp_alloc_memory(); /* AP processor realmode stacks in low memory*/
794 #endif
795 paging_init();
798 * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
801 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
802 if (init_ohci1394_dma_early)
803 init_ohci1394_dma_on_all_controllers();
804 #endif
806 remapped_pgdat_init();
807 sparse_init();
808 zone_sizes_init();
811 * NOTE: at this point the bootmem allocator is fully available.
814 #ifdef CONFIG_BLK_DEV_INITRD
815 relocate_initrd();
816 #endif
818 paravirt_post_allocator_init();
820 dmi_scan_machine();
822 io_delay_init();
824 #ifdef CONFIG_X86_GENERICARCH
825 generic_apic_probe();
826 #endif
828 #ifdef CONFIG_ACPI
830 * Parse the ACPI tables for possible boot-time SMP configuration.
832 acpi_boot_table_init();
833 #endif
835 early_quirks();
837 #ifdef CONFIG_ACPI
838 acpi_boot_init();
840 #if defined(CONFIG_SMP) && defined(CONFIG_X86_PC)
841 if (def_to_bigsmp)
842 printk(KERN_WARNING "More than 8 CPUs detected and "
843 "CONFIG_X86_PC cannot handle it.\nUse "
844 "CONFIG_X86_GENERICARCH or CONFIG_X86_BIGSMP.\n");
845 #endif
846 #endif
847 #ifdef CONFIG_X86_LOCAL_APIC
848 if (smp_found_config)
849 get_smp_config();
850 #endif
852 e820_register_memory();
853 e820_mark_nosave_regions();
855 #ifdef CONFIG_VT
856 #if defined(CONFIG_VGA_CONSOLE)
857 if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
858 conswitchp = &vga_con;
859 #elif defined(CONFIG_DUMMY_CONSOLE)
860 conswitchp = &dummy_con;
861 #endif
862 #endif
866 * Request address space for all standard resources
868 * This is called just before pcibios_init(), which is also a
869 * subsys_initcall, but is linked in later (in arch/i386/pci/common.c).
871 static int __init request_standard_resources(void)
873 int i;
875 printk(KERN_INFO "Setting up standard PCI resources\n");
876 init_iomem_resources(&code_resource, &data_resource, &bss_resource);
878 request_resource(&iomem_resource, &video_ram_resource);
880 /* request I/O space for devices used on all i[345]86 PCs */
881 for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
882 request_resource(&ioport_resource, &standard_io_resources[i]);
883 return 0;
886 subsys_initcall(request_standard_resources);