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_LOWMEM_KILOBYTES 0x413
395 * The BIOS places the EBDA/XBDA at the top of conventional
396 * memory, and usually decreases the reported amount of
397 * conventional memory (int 0x12) too. This also contains a
398 * workaround for Dell systems that neglect to reserve EBDA.
399 * The same workaround also avoids a problem with the AMD768MPX
400 * chipset: reserve a page before VGA to prevent PCI prefetch
401 * into it (errata #56). Usually the page is reserved anyways,
402 * unless you have no PS/2 mouse plugged in.
404 static void __init
reserve_ebda_region(void)
406 unsigned int lowmem
, ebda_addr
;
408 /* To determine the position of the EBDA and the */
409 /* end of conventional memory, we need to look at */
410 /* the BIOS data area. In a paravirtual environment */
411 /* that area is absent. We'll just have to assume */
412 /* that the paravirt case can handle memory setup */
413 /* correctly, without our help. */
414 if (paravirt_enabled())
417 /* end of low (conventional) memory */
418 lowmem
= *(unsigned short *)__va(BIOS_LOWMEM_KILOBYTES
);
421 /* start of EBDA area */
422 ebda_addr
= get_bios_ebda();
424 /* Fixup: bios puts an EBDA in the top 64K segment */
425 /* of conventional memory, but does not adjust lowmem. */
426 if ((lowmem
- ebda_addr
) <= 0x10000)
429 /* Fixup: bios does not report an EBDA at all. */
430 /* Some old Dells seem to need 4k anyhow (bugzilla 2990) */
431 if ((ebda_addr
== 0) && (lowmem
>= 0x9f000))
434 /* Paranoia: should never happen, but... */
435 if ((lowmem
== 0) || (lowmem
>= 0x100000))
438 /* reserve all memory between lowmem and the 1MB mark */
439 reserve_bootmem(lowmem
, 0x100000 - lowmem
, BOOTMEM_DEFAULT
);
442 #ifndef CONFIG_NEED_MULTIPLE_NODES
443 static void __init
setup_bootmem_allocator(void);
444 static unsigned long __init
setup_memory(void)
447 * partially used pages are not usable - thus
448 * we are rounding upwards:
450 min_low_pfn
= PFN_UP(init_pg_tables_end
);
452 max_low_pfn
= find_max_low_pfn();
454 #ifdef CONFIG_HIGHMEM
455 highstart_pfn
= highend_pfn
= max_pfn
;
456 if (max_pfn
> max_low_pfn
) {
457 highstart_pfn
= max_low_pfn
;
459 printk(KERN_NOTICE
"%ldMB HIGHMEM available.\n",
460 pages_to_mb(highend_pfn
- highstart_pfn
));
461 num_physpages
= highend_pfn
;
462 high_memory
= (void *) __va(highstart_pfn
* PAGE_SIZE
- 1) + 1;
464 num_physpages
= max_low_pfn
;
465 high_memory
= (void *) __va(max_low_pfn
* PAGE_SIZE
- 1) + 1;
467 #ifdef CONFIG_FLATMEM
468 max_mapnr
= num_physpages
;
470 printk(KERN_NOTICE
"%ldMB LOWMEM available.\n",
471 pages_to_mb(max_low_pfn
));
473 setup_bootmem_allocator();
478 static void __init
zone_sizes_init(void)
480 unsigned long max_zone_pfns
[MAX_NR_ZONES
];
481 memset(max_zone_pfns
, 0, sizeof(max_zone_pfns
));
482 max_zone_pfns
[ZONE_DMA
] =
483 virt_to_phys((char *)MAX_DMA_ADDRESS
) >> PAGE_SHIFT
;
484 max_zone_pfns
[ZONE_NORMAL
] = max_low_pfn
;
485 #ifdef CONFIG_HIGHMEM
486 max_zone_pfns
[ZONE_HIGHMEM
] = highend_pfn
;
487 add_active_range(0, 0, highend_pfn
);
489 add_active_range(0, 0, max_low_pfn
);
492 free_area_init_nodes(max_zone_pfns
);
495 extern unsigned long __init
setup_memory(void);
496 extern void zone_sizes_init(void);
497 #endif /* !CONFIG_NEED_MULTIPLE_NODES */
499 static inline unsigned long long get_total_mem(void)
501 unsigned long long total
;
503 total
= max_low_pfn
- min_low_pfn
;
504 #ifdef CONFIG_HIGHMEM
505 total
+= highend_pfn
- highstart_pfn
;
508 return total
<< PAGE_SHIFT
;
512 static void __init
reserve_crashkernel(void)
514 unsigned long long total_mem
;
515 unsigned long long crash_size
, crash_base
;
518 total_mem
= get_total_mem();
520 ret
= parse_crashkernel(boot_command_line
, total_mem
,
521 &crash_size
, &crash_base
);
522 if (ret
== 0 && crash_size
> 0) {
523 if (crash_base
> 0) {
524 printk(KERN_INFO
"Reserving %ldMB of memory at %ldMB "
525 "for crashkernel (System RAM: %ldMB)\n",
526 (unsigned long)(crash_size
>> 20),
527 (unsigned long)(crash_base
>> 20),
528 (unsigned long)(total_mem
>> 20));
529 crashk_res
.start
= crash_base
;
530 crashk_res
.end
= crash_base
+ crash_size
- 1;
531 reserve_bootmem(crash_base
, crash_size
,
534 printk(KERN_INFO
"crashkernel reservation failed - "
535 "you have to specify a base address\n");
539 static inline void __init
reserve_crashkernel(void)
543 #ifdef CONFIG_BLK_DEV_INITRD
545 static bool do_relocate_initrd
= false;
547 static void __init
reserve_initrd(void)
549 unsigned long ramdisk_image
= boot_params
.hdr
.ramdisk_image
;
550 unsigned long ramdisk_size
= boot_params
.hdr
.ramdisk_size
;
551 unsigned long ramdisk_end
= ramdisk_image
+ ramdisk_size
;
552 unsigned long end_of_lowmem
= max_low_pfn
<< PAGE_SHIFT
;
553 unsigned long ramdisk_here
;
557 if (!boot_params
.hdr
.type_of_loader
||
558 !ramdisk_image
|| !ramdisk_size
)
559 return; /* No initrd provided by bootloader */
561 if (ramdisk_end
< ramdisk_image
) {
562 printk(KERN_ERR
"initrd wraps around end of memory, "
563 "disabling initrd\n");
566 if (ramdisk_size
>= end_of_lowmem
/2) {
567 printk(KERN_ERR
"initrd too large to handle, "
568 "disabling initrd\n");
571 if (ramdisk_end
<= end_of_lowmem
) {
572 /* All in lowmem, easy case */
573 reserve_bootmem(ramdisk_image
, ramdisk_size
, BOOTMEM_DEFAULT
);
574 initrd_start
= ramdisk_image
+ PAGE_OFFSET
;
575 initrd_end
= initrd_start
+ramdisk_size
;
579 /* We need to move the initrd down into lowmem */
580 ramdisk_here
= (end_of_lowmem
- ramdisk_size
) & PAGE_MASK
;
582 /* Note: this includes all the lowmem currently occupied by
583 the initrd, we rely on that fact to keep the data intact. */
584 reserve_bootmem(ramdisk_here
, ramdisk_size
, BOOTMEM_DEFAULT
);
585 initrd_start
= ramdisk_here
+ PAGE_OFFSET
;
586 initrd_end
= initrd_start
+ ramdisk_size
;
588 do_relocate_initrd
= true;
591 #define MAX_MAP_CHUNK (NR_FIX_BTMAPS << PAGE_SHIFT)
593 static void __init
relocate_initrd(void)
595 unsigned long ramdisk_image
= boot_params
.hdr
.ramdisk_image
;
596 unsigned long ramdisk_size
= boot_params
.hdr
.ramdisk_size
;
597 unsigned long end_of_lowmem
= max_low_pfn
<< PAGE_SHIFT
;
598 unsigned long ramdisk_here
;
599 unsigned long slop
, clen
, mapaddr
;
602 if (!do_relocate_initrd
)
605 ramdisk_here
= initrd_start
- PAGE_OFFSET
;
607 q
= (char *)initrd_start
;
609 /* Copy any lowmem portion of the initrd */
610 if (ramdisk_image
< end_of_lowmem
) {
611 clen
= end_of_lowmem
- ramdisk_image
;
612 p
= (char *)__va(ramdisk_image
);
615 ramdisk_image
+= clen
;
616 ramdisk_size
-= clen
;
619 /* Copy the highmem portion of the initrd */
620 while (ramdisk_size
) {
621 slop
= ramdisk_image
& ~PAGE_MASK
;
623 if (clen
> MAX_MAP_CHUNK
-slop
)
624 clen
= MAX_MAP_CHUNK
-slop
;
625 mapaddr
= ramdisk_image
& PAGE_MASK
;
626 p
= early_ioremap(mapaddr
, clen
+slop
);
627 memcpy(q
, p
+slop
, clen
);
628 early_iounmap(p
, clen
+slop
);
630 ramdisk_image
+= clen
;
631 ramdisk_size
-= clen
;
635 #endif /* CONFIG_BLK_DEV_INITRD */
637 void __init
setup_bootmem_allocator(void)
639 unsigned long bootmap_size
;
641 * Initialize the boot-time allocator (with low memory only):
643 bootmap_size
= init_bootmem(min_low_pfn
, max_low_pfn
);
645 register_bootmem_low_pages(max_low_pfn
);
648 * Reserve the bootmem bitmap itself as well. We do this in two
649 * steps (first step was init_bootmem()) because this catches
650 * the (very unlikely) case of us accidentally initializing the
651 * bootmem allocator with an invalid RAM area.
653 reserve_bootmem(__pa_symbol(_text
), (PFN_PHYS(min_low_pfn
) +
654 bootmap_size
+ PAGE_SIZE
-1) - __pa_symbol(_text
),
658 * reserve physical page 0 - it's a special BIOS page on many boxes,
659 * enabling clean reboots, SMP operation, laptop functions.
661 reserve_bootmem(0, PAGE_SIZE
, BOOTMEM_DEFAULT
);
663 /* reserve EBDA region */
664 reserve_ebda_region();
668 * But first pinch a few for the stack/trampoline stuff
669 * FIXME: Don't need the extra page at 4K, but need to fix
670 * trampoline before removing it. (see the GDT stuff)
672 reserve_bootmem(PAGE_SIZE
, PAGE_SIZE
, BOOTMEM_DEFAULT
);
674 #ifdef CONFIG_ACPI_SLEEP
676 * Reserve low memory region for sleep support.
678 acpi_reserve_bootmem();
680 #ifdef CONFIG_X86_FIND_SMP_CONFIG
682 * Find and reserve possible boot-time SMP configuration:
686 #ifdef CONFIG_BLK_DEV_INITRD
690 reserve_crashkernel();
692 reserve_ibft_region();
696 * The node 0 pgdat is initialized before all of these because
697 * it's needed for bootmem. node>0 pgdats have their virtual
698 * space allocated before the pagetables are in place to access
699 * them, so they can't be cleared then.
701 * This should all compile down to nothing when NUMA is off.
703 static void __init
remapped_pgdat_init(void)
707 for_each_online_node(nid
) {
709 memset(NODE_DATA(nid
), 0, sizeof(struct pglist_data
));
714 static void set_mca_bus(int x
)
719 static void set_mca_bus(int x
) { }
722 /* Overridden in paravirt.c if CONFIG_PARAVIRT */
723 char * __init
__attribute__((weak
)) memory_setup(void)
725 return machine_specific_memory_setup();
730 * In the golden day, when everything among i386 and x86_64 will be
731 * integrated, this will not live here
733 void *x86_cpu_to_node_map_early_ptr
;
734 int x86_cpu_to_node_map_init
[NR_CPUS
] = {
735 [0 ... NR_CPUS
-1] = NUMA_NO_NODE
737 DEFINE_PER_CPU(int, x86_cpu_to_node_map
) = NUMA_NO_NODE
;
741 * Determine if we were loaded by an EFI loader. If so, then we have also been
742 * passed the efi memmap, systab, etc., so we should use these data structures
743 * for initialization. Note, the efi init code path is determined by the
744 * global efi_enabled. This allows the same kernel image to be used on existing
745 * systems (with a traditional BIOS) as well as on EFI systems.
747 void __init
setup_arch(char **cmdline_p
)
749 unsigned long max_low_pfn
;
751 memcpy(&boot_cpu_data
, &new_cpu_data
, sizeof(new_cpu_data
));
752 pre_setup_arch_hook();
754 early_ioremap_init();
757 if (!strncmp((char *)&boot_params
.efi_info
.efi_loader_signature
,
762 ROOT_DEV
= old_decode_dev(boot_params
.hdr
.root_dev
);
763 screen_info
= boot_params
.screen_info
;
764 edid_info
= boot_params
.edid_info
;
765 apm_info
.bios
= boot_params
.apm_bios_info
;
766 ist_info
= boot_params
.ist_info
;
767 saved_video_mode
= boot_params
.hdr
.vid_mode
;
768 if( boot_params
.sys_desc_table
.length
!= 0 ) {
769 set_mca_bus(boot_params
.sys_desc_table
.table
[3] & 0x2);
770 machine_id
= boot_params
.sys_desc_table
.table
[0];
771 machine_submodel_id
= boot_params
.sys_desc_table
.table
[1];
772 BIOS_revision
= boot_params
.sys_desc_table
.table
[2];
774 bootloader_type
= boot_params
.hdr
.type_of_loader
;
776 #ifdef CONFIG_BLK_DEV_RAM
777 rd_image_start
= boot_params
.hdr
.ram_size
& RAMDISK_IMAGE_START_MASK
;
778 rd_prompt
= ((boot_params
.hdr
.ram_size
& RAMDISK_PROMPT_FLAG
) != 0);
779 rd_doload
= ((boot_params
.hdr
.ram_size
& RAMDISK_LOAD_FLAG
) != 0);
783 printk(KERN_INFO
"BIOS-provided physical RAM map:\n");
784 print_memory_map(memory_setup());
788 if (!boot_params
.hdr
.root_flags
)
789 root_mountflags
&= ~MS_RDONLY
;
790 init_mm
.start_code
= (unsigned long) _text
;
791 init_mm
.end_code
= (unsigned long) _etext
;
792 init_mm
.end_data
= (unsigned long) _edata
;
793 init_mm
.brk
= init_pg_tables_end
+ PAGE_OFFSET
;
795 code_resource
.start
= virt_to_phys(_text
);
796 code_resource
.end
= virt_to_phys(_etext
)-1;
797 data_resource
.start
= virt_to_phys(_etext
);
798 data_resource
.end
= virt_to_phys(_edata
)-1;
799 bss_resource
.start
= virt_to_phys(&__bss_start
);
800 bss_resource
.end
= virt_to_phys(&__bss_stop
)-1;
804 if (user_defined_memmap
) {
805 printk(KERN_INFO
"user-defined physical RAM map:\n");
806 print_memory_map("user");
809 strlcpy(command_line
, boot_command_line
, COMMAND_LINE_SIZE
);
810 *cmdline_p
= command_line
;
815 /* update e820 for memory not covered by WB MTRRs */
816 propagate_e820_map();
818 if (mtrr_trim_uncached_memory(max_pfn
))
819 propagate_e820_map();
821 max_low_pfn
= setup_memory();
825 * Must be after max_low_pfn is determined, and before kernel
826 * pagetables are setup.
832 * NOTE: before this point _nobody_ is allowed to allocate
833 * any memory using the bootmem allocator. Although the
834 * allocator is now initialised only the first 8Mb of the kernel
835 * virtual address space has been mapped. All allocations before
836 * paging_init() has completed must use the alloc_bootmem_low_pages()
837 * variant (which allocates DMA'able memory) and care must be taken
838 * not to exceed the 8Mb limit.
842 smp_alloc_memory(); /* AP processor realmode stacks in low memory*/
847 * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
850 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
851 if (init_ohci1394_dma_early
)
852 init_ohci1394_dma_on_all_controllers();
855 remapped_pgdat_init();
860 * NOTE: at this point the bootmem allocator is fully available.
863 #ifdef CONFIG_BLK_DEV_INITRD
867 paravirt_post_allocator_init();
873 #ifdef CONFIG_X86_SMP
875 * setup to use the early static init tables during kernel startup
876 * X86_SMP will exclude sub-arches that don't deal well with it.
878 x86_cpu_to_apicid_early_ptr
= (void *)x86_cpu_to_apicid_init
;
879 x86_bios_cpu_apicid_early_ptr
= (void *)x86_bios_cpu_apicid_init
;
881 x86_cpu_to_node_map_early_ptr
= (void *)x86_cpu_to_node_map_init
;
885 #ifdef CONFIG_X86_GENERICARCH
886 generic_apic_probe();
891 * Parse the ACPI tables for possible boot-time SMP configuration.
893 acpi_boot_table_init();
901 #if defined(CONFIG_SMP) && defined(CONFIG_X86_PC)
903 printk(KERN_WARNING
"More than 8 CPUs detected and "
904 "CONFIG_X86_PC cannot handle it.\nUse "
905 "CONFIG_X86_GENERICARCH or CONFIG_X86_BIGSMP.\n");
908 #ifdef CONFIG_X86_LOCAL_APIC
909 if (smp_found_config
)
913 e820_register_memory();
914 e820_mark_nosave_regions();
917 #if defined(CONFIG_VGA_CONSOLE)
918 if (!efi_enabled
|| (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY
))
919 conswitchp
= &vga_con
;
920 #elif defined(CONFIG_DUMMY_CONSOLE)
921 conswitchp
= &dummy_con
;
927 * Request address space for all standard resources
929 * This is called just before pcibios_init(), which is also a
930 * subsys_initcall, but is linked in later (in arch/i386/pci/common.c).
932 static int __init
request_standard_resources(void)
936 printk(KERN_INFO
"Setting up standard PCI resources\n");
937 init_iomem_resources(&code_resource
, &data_resource
, &bss_resource
);
939 request_resource(&iomem_resource
, &video_ram_resource
);
941 /* request I/O space for devices used on all i[345]86 PCs */
942 for (i
= 0; i
< ARRAY_SIZE(standard_io_resources
); i
++)
943 request_resource(&ioport_resource
, &standard_io_resources
[i
]);
947 subsys_initcall(request_standard_resources
);