2 * Copyright (C) 1995 Linus Torvalds
4 * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999
6 * Memory region support
7 * David Parsons <orc@pell.chi.il.us>, July-August 1999
9 * Added E820 sanitization routine (removes overlapping memory regions);
10 * Brian Moyle <bmoyle@mvista.com>, February 2001
12 * Moved CPU detection code to cpu/${cpu}.c
13 * Patrick Mochel <mochel@osdl.org>, March 2002
15 * Provisions for empty E820 memory regions (reported by certain BIOSes).
16 * Alex Achenbach <xela@slit.de>, December 2002.
21 * This file handles the architecture-dependent parts of initialization
24 #include <linux/sched.h>
26 #include <linux/mmzone.h>
27 #include <linux/screen_info.h>
28 #include <linux/ioport.h>
29 #include <linux/acpi.h>
30 #include <linux/apm_bios.h>
31 #include <linux/initrd.h>
32 #include <linux/bootmem.h>
33 #include <linux/seq_file.h>
34 #include <linux/console.h>
35 #include <linux/mca.h>
36 #include <linux/root_dev.h>
37 #include <linux/highmem.h>
38 #include <linux/module.h>
39 #include <linux/efi.h>
40 #include <linux/init.h>
41 #include <linux/edd.h>
42 #include <linux/iscsi_ibft.h>
43 #include <linux/nodemask.h>
44 #include <linux/kexec.h>
45 #include <linux/crash_dump.h>
46 #include <linux/dmi.h>
47 #include <linux/pfn.h>
48 #include <linux/pci.h>
49 #include <linux/init_ohci1394_dma.h>
50 #include <linux/kvm_para.h>
52 #include <video/edid.h>
57 #include <asm/mpspec.h>
58 #include <asm/mmzone.h>
59 #include <asm/setup.h>
60 #include <asm/arch_hooks.h>
61 #include <asm/sections.h>
62 #include <asm/io_apic.h>
66 #include <setup_arch.h>
67 #include <asm/bios_ebda.h>
68 #include <asm/cacheflush.h>
69 #include <asm/processor.h>
71 /* This value is set up by the early boot code to point to the value
72 immediately after the boot time page tables. It contains a *physical*
73 address, and must not be in the .bss segment! */
74 unsigned long init_pg_tables_end __initdata
= ~0UL;
79 static struct resource data_resource
= {
80 .name
= "Kernel data",
83 .flags
= IORESOURCE_BUSY
| IORESOURCE_MEM
86 static struct resource code_resource
= {
87 .name
= "Kernel code",
90 .flags
= IORESOURCE_BUSY
| IORESOURCE_MEM
93 static struct resource bss_resource
= {
97 .flags
= IORESOURCE_BUSY
| IORESOURCE_MEM
100 static struct resource video_ram_resource
= {
101 .name
= "Video RAM area",
104 .flags
= IORESOURCE_BUSY
| IORESOURCE_MEM
107 static struct resource standard_io_resources
[] = { {
111 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
116 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
121 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
126 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
131 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
136 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
138 .name
= "dma page reg",
141 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
146 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
151 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
156 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
159 /* cpu data as detected by the assembly code in head.S */
160 struct cpuinfo_x86 new_cpu_data __cpuinitdata
= { 0, 0, 0, 0, -1, 1, 0, 0, -1 };
161 /* common cpu data for all cpus */
162 struct cpuinfo_x86 boot_cpu_data __read_mostly
= { 0, 0, 0, 0, -1, 1, 0, 0, -1 };
163 EXPORT_SYMBOL(boot_cpu_data
);
165 unsigned int def_to_bigsmp
;
167 #ifndef CONFIG_X86_PAE
168 unsigned long mmu_cr4_features
;
170 unsigned long mmu_cr4_features
= X86_CR4_PAE
;
173 /* for MCA, but anyone else can use it if they want */
174 unsigned int machine_id
;
175 unsigned int machine_submodel_id
;
176 unsigned int BIOS_revision
;
178 /* Boot loader ID as an integer, for the benefit of proc_dointvec */
181 /* user-defined highmem size */
182 static unsigned int highmem_pages
= -1;
187 struct screen_info screen_info
;
188 EXPORT_SYMBOL(screen_info
);
189 struct apm_info apm_info
;
190 EXPORT_SYMBOL(apm_info
);
191 struct edid_info edid_info
;
192 EXPORT_SYMBOL_GPL(edid_info
);
193 struct ist_info ist_info
;
194 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
195 defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
196 EXPORT_SYMBOL(ist_info
);
199 extern void early_cpu_init(void);
200 extern int root_mountflags
;
202 unsigned long saved_video_mode
;
204 #define RAMDISK_IMAGE_START_MASK 0x07FF
205 #define RAMDISK_PROMPT_FLAG 0x8000
206 #define RAMDISK_LOAD_FLAG 0x4000
208 static char __initdata command_line
[COMMAND_LINE_SIZE
];
210 #ifndef CONFIG_DEBUG_BOOT_PARAMS
211 struct boot_params __initdata boot_params
;
213 struct boot_params boot_params
;
216 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
218 #ifdef CONFIG_EDD_MODULE
222 * copy_edd() - Copy the BIOS EDD information
223 * from boot_params into a safe place.
226 static inline void copy_edd(void)
228 memcpy(edd
.mbr_signature
, boot_params
.edd_mbr_sig_buffer
,
229 sizeof(edd
.mbr_signature
));
230 memcpy(edd
.edd_info
, boot_params
.eddbuf
, sizeof(edd
.edd_info
));
231 edd
.mbr_signature_nr
= boot_params
.edd_mbr_sig_buf_entries
;
232 edd
.edd_info_nr
= boot_params
.eddbuf_entries
;
235 static inline void copy_edd(void)
240 #ifdef CONFIG_PROC_VMCORE
241 /* elfcorehdr= specifies the location of elf core header
242 * stored by the crashed kernel.
244 static int __init
parse_elfcorehdr(char *arg
)
249 elfcorehdr_addr
= memparse(arg
, &arg
);
252 early_param("elfcorehdr", parse_elfcorehdr
);
253 #endif /* CONFIG_PROC_VMCORE */
256 * highmem=size forces highmem to be exactly 'size' bytes.
257 * This works even on boxes that have no highmem otherwise.
258 * This also works to reduce highmem size on bigger boxes.
260 static int __init
parse_highmem(char *arg
)
265 highmem_pages
= memparse(arg
, &arg
) >> PAGE_SHIFT
;
268 early_param("highmem", parse_highmem
);
271 * vmalloc=size forces the vmalloc area to be exactly 'size'
272 * bytes. This can be used to increase (or decrease) the
273 * vmalloc area - the default is 128m.
275 static int __init
parse_vmalloc(char *arg
)
280 __VMALLOC_RESERVE
= memparse(arg
, &arg
);
283 early_param("vmalloc", parse_vmalloc
);
286 * reservetop=size reserves a hole at the top of the kernel address space which
287 * a hypervisor can load into later. Needed for dynamically loaded hypervisors,
288 * so relocating the fixmap can be done before paging initialization.
290 static int __init
parse_reservetop(char *arg
)
292 unsigned long address
;
297 address
= memparse(arg
, &arg
);
298 reserve_top_address(address
);
301 early_param("reservetop", parse_reservetop
);
304 * Determine low and high memory ranges:
306 unsigned long __init
find_max_low_pfn(void)
308 unsigned long max_low_pfn
;
310 max_low_pfn
= max_pfn
;
311 if (max_low_pfn
> MAXMEM_PFN
) {
312 if (highmem_pages
== -1)
313 highmem_pages
= max_pfn
- MAXMEM_PFN
;
314 if (highmem_pages
+ MAXMEM_PFN
< max_pfn
)
315 max_pfn
= MAXMEM_PFN
+ highmem_pages
;
316 if (highmem_pages
+ MAXMEM_PFN
> max_pfn
) {
317 printk("only %luMB highmem pages available, ignoring highmem size of %uMB.\n", pages_to_mb(max_pfn
- MAXMEM_PFN
), pages_to_mb(highmem_pages
));
320 max_low_pfn
= MAXMEM_PFN
;
321 #ifndef CONFIG_HIGHMEM
322 /* Maximum memory usable is what is directly addressable */
323 printk(KERN_WARNING
"Warning only %ldMB will be used.\n",
325 if (max_pfn
> MAX_NONPAE_PFN
)
326 printk(KERN_WARNING
"Use a HIGHMEM64G enabled kernel.\n");
328 printk(KERN_WARNING
"Use a HIGHMEM enabled kernel.\n");
329 max_pfn
= MAXMEM_PFN
;
330 #else /* !CONFIG_HIGHMEM */
331 #ifndef CONFIG_HIGHMEM64G
332 if (max_pfn
> MAX_NONPAE_PFN
) {
333 max_pfn
= MAX_NONPAE_PFN
;
334 printk(KERN_WARNING
"Warning only 4GB will be used.\n");
335 printk(KERN_WARNING
"Use a HIGHMEM64G enabled kernel.\n");
337 #endif /* !CONFIG_HIGHMEM64G */
338 #endif /* !CONFIG_HIGHMEM */
340 if (highmem_pages
== -1)
342 #ifdef CONFIG_HIGHMEM
343 if (highmem_pages
>= max_pfn
) {
344 printk(KERN_ERR
"highmem size specified (%uMB) is bigger than pages available (%luMB)!.\n", pages_to_mb(highmem_pages
), pages_to_mb(max_pfn
));
348 if (max_low_pfn
-highmem_pages
< 64*1024*1024/PAGE_SIZE
){
349 printk(KERN_ERR
"highmem size %uMB results in smaller than 64MB lowmem, ignoring it.\n", pages_to_mb(highmem_pages
));
352 max_low_pfn
-= highmem_pages
;
356 printk(KERN_ERR
"ignoring highmem size on non-highmem kernel!\n");
362 #define BIOS_LOWMEM_KILOBYTES 0x413
365 * The BIOS places the EBDA/XBDA at the top of conventional
366 * memory, and usually decreases the reported amount of
367 * conventional memory (int 0x12) too. This also contains a
368 * workaround for Dell systems that neglect to reserve EBDA.
369 * The same workaround also avoids a problem with the AMD768MPX
370 * chipset: reserve a page before VGA to prevent PCI prefetch
371 * into it (errata #56). Usually the page is reserved anyways,
372 * unless you have no PS/2 mouse plugged in.
374 static void __init
reserve_ebda_region(void)
376 unsigned int lowmem
, ebda_addr
;
378 /* To determine the position of the EBDA and the */
379 /* end of conventional memory, we need to look at */
380 /* the BIOS data area. In a paravirtual environment */
381 /* that area is absent. We'll just have to assume */
382 /* that the paravirt case can handle memory setup */
383 /* correctly, without our help. */
384 if (paravirt_enabled())
387 /* end of low (conventional) memory */
388 lowmem
= *(unsigned short *)__va(BIOS_LOWMEM_KILOBYTES
);
391 /* start of EBDA area */
392 ebda_addr
= get_bios_ebda();
394 /* Fixup: bios puts an EBDA in the top 64K segment */
395 /* of conventional memory, but does not adjust lowmem. */
396 if ((lowmem
- ebda_addr
) <= 0x10000)
399 /* Fixup: bios does not report an EBDA at all. */
400 /* Some old Dells seem to need 4k anyhow (bugzilla 2990) */
401 if ((ebda_addr
== 0) && (lowmem
>= 0x9f000))
404 /* Paranoia: should never happen, but... */
405 if ((lowmem
== 0) || (lowmem
>= 0x100000))
408 /* reserve all memory between lowmem and the 1MB mark */
409 reserve_bootmem(lowmem
, 0x100000 - lowmem
, BOOTMEM_DEFAULT
);
412 #ifndef CONFIG_NEED_MULTIPLE_NODES
413 static void __init
setup_bootmem_allocator(void);
414 static unsigned long __init
setup_memory(void)
417 * partially used pages are not usable - thus
418 * we are rounding upwards:
420 min_low_pfn
= PFN_UP(init_pg_tables_end
);
422 max_low_pfn
= find_max_low_pfn();
424 #ifdef CONFIG_HIGHMEM
425 highstart_pfn
= highend_pfn
= max_pfn
;
426 if (max_pfn
> max_low_pfn
) {
427 highstart_pfn
= max_low_pfn
;
429 printk(KERN_NOTICE
"%ldMB HIGHMEM available.\n",
430 pages_to_mb(highend_pfn
- highstart_pfn
));
431 num_physpages
= highend_pfn
;
432 high_memory
= (void *) __va(highstart_pfn
* PAGE_SIZE
- 1) + 1;
434 num_physpages
= max_low_pfn
;
435 high_memory
= (void *) __va(max_low_pfn
* PAGE_SIZE
- 1) + 1;
437 #ifdef CONFIG_FLATMEM
438 max_mapnr
= num_physpages
;
440 printk(KERN_NOTICE
"%ldMB LOWMEM available.\n",
441 pages_to_mb(max_low_pfn
));
443 setup_bootmem_allocator();
448 static void __init
zone_sizes_init(void)
450 unsigned long max_zone_pfns
[MAX_NR_ZONES
];
451 memset(max_zone_pfns
, 0, sizeof(max_zone_pfns
));
452 max_zone_pfns
[ZONE_DMA
] =
453 virt_to_phys((char *)MAX_DMA_ADDRESS
) >> PAGE_SHIFT
;
454 max_zone_pfns
[ZONE_NORMAL
] = max_low_pfn
;
455 #ifdef CONFIG_HIGHMEM
456 max_zone_pfns
[ZONE_HIGHMEM
] = highend_pfn
;
457 add_active_range(0, 0, highend_pfn
);
459 add_active_range(0, 0, max_low_pfn
);
462 free_area_init_nodes(max_zone_pfns
);
465 extern unsigned long __init
setup_memory(void);
466 extern void zone_sizes_init(void);
467 #endif /* !CONFIG_NEED_MULTIPLE_NODES */
469 static inline unsigned long long get_total_mem(void)
471 unsigned long long total
;
473 total
= max_low_pfn
- min_low_pfn
;
474 #ifdef CONFIG_HIGHMEM
475 total
+= highend_pfn
- highstart_pfn
;
478 return total
<< PAGE_SHIFT
;
482 static void __init
reserve_crashkernel(void)
484 unsigned long long total_mem
;
485 unsigned long long crash_size
, crash_base
;
488 total_mem
= get_total_mem();
490 ret
= parse_crashkernel(boot_command_line
, total_mem
,
491 &crash_size
, &crash_base
);
492 if (ret
== 0 && crash_size
> 0) {
493 if (crash_base
> 0) {
494 printk(KERN_INFO
"Reserving %ldMB of memory at %ldMB "
495 "for crashkernel (System RAM: %ldMB)\n",
496 (unsigned long)(crash_size
>> 20),
497 (unsigned long)(crash_base
>> 20),
498 (unsigned long)(total_mem
>> 20));
499 crashk_res
.start
= crash_base
;
500 crashk_res
.end
= crash_base
+ crash_size
- 1;
501 reserve_bootmem(crash_base
, crash_size
,
504 printk(KERN_INFO
"crashkernel reservation failed - "
505 "you have to specify a base address\n");
509 static inline void __init
reserve_crashkernel(void)
513 #ifdef CONFIG_BLK_DEV_INITRD
515 static bool do_relocate_initrd
= false;
517 static void __init
reserve_initrd(void)
519 unsigned long ramdisk_image
= boot_params
.hdr
.ramdisk_image
;
520 unsigned long ramdisk_size
= boot_params
.hdr
.ramdisk_size
;
521 unsigned long ramdisk_end
= ramdisk_image
+ ramdisk_size
;
522 unsigned long end_of_lowmem
= max_low_pfn
<< PAGE_SHIFT
;
523 unsigned long ramdisk_here
;
527 if (!boot_params
.hdr
.type_of_loader
||
528 !ramdisk_image
|| !ramdisk_size
)
529 return; /* No initrd provided by bootloader */
531 if (ramdisk_end
< ramdisk_image
) {
532 printk(KERN_ERR
"initrd wraps around end of memory, "
533 "disabling initrd\n");
536 if (ramdisk_size
>= end_of_lowmem
/2) {
537 printk(KERN_ERR
"initrd too large to handle, "
538 "disabling initrd\n");
541 if (ramdisk_end
<= end_of_lowmem
) {
542 /* All in lowmem, easy case */
543 reserve_bootmem(ramdisk_image
, ramdisk_size
, BOOTMEM_DEFAULT
);
544 initrd_start
= ramdisk_image
+ PAGE_OFFSET
;
545 initrd_end
= initrd_start
+ramdisk_size
;
549 /* We need to move the initrd down into lowmem */
550 ramdisk_here
= (end_of_lowmem
- ramdisk_size
) & PAGE_MASK
;
552 /* Note: this includes all the lowmem currently occupied by
553 the initrd, we rely on that fact to keep the data intact. */
554 reserve_bootmem(ramdisk_here
, ramdisk_size
, BOOTMEM_DEFAULT
);
555 initrd_start
= ramdisk_here
+ PAGE_OFFSET
;
556 initrd_end
= initrd_start
+ ramdisk_size
;
558 do_relocate_initrd
= true;
561 #define MAX_MAP_CHUNK (NR_FIX_BTMAPS << PAGE_SHIFT)
563 static void __init
relocate_initrd(void)
565 unsigned long ramdisk_image
= boot_params
.hdr
.ramdisk_image
;
566 unsigned long ramdisk_size
= boot_params
.hdr
.ramdisk_size
;
567 unsigned long end_of_lowmem
= max_low_pfn
<< PAGE_SHIFT
;
568 unsigned long ramdisk_here
;
569 unsigned long slop
, clen
, mapaddr
;
572 if (!do_relocate_initrd
)
575 ramdisk_here
= initrd_start
- PAGE_OFFSET
;
577 q
= (char *)initrd_start
;
579 /* Copy any lowmem portion of the initrd */
580 if (ramdisk_image
< end_of_lowmem
) {
581 clen
= end_of_lowmem
- ramdisk_image
;
582 p
= (char *)__va(ramdisk_image
);
585 ramdisk_image
+= clen
;
586 ramdisk_size
-= clen
;
589 /* Copy the highmem portion of the initrd */
590 while (ramdisk_size
) {
591 slop
= ramdisk_image
& ~PAGE_MASK
;
593 if (clen
> MAX_MAP_CHUNK
-slop
)
594 clen
= MAX_MAP_CHUNK
-slop
;
595 mapaddr
= ramdisk_image
& PAGE_MASK
;
596 p
= early_ioremap(mapaddr
, clen
+slop
);
597 memcpy(q
, p
+slop
, clen
);
598 early_iounmap(p
, clen
+slop
);
600 ramdisk_image
+= clen
;
601 ramdisk_size
-= clen
;
605 #endif /* CONFIG_BLK_DEV_INITRD */
607 void __init
setup_bootmem_allocator(void)
609 unsigned long bootmap_size
;
611 * Initialize the boot-time allocator (with low memory only):
613 bootmap_size
= init_bootmem(min_low_pfn
, max_low_pfn
);
615 register_bootmem_low_pages(max_low_pfn
);
618 * Reserve the bootmem bitmap itself as well. We do this in two
619 * steps (first step was init_bootmem()) because this catches
620 * the (very unlikely) case of us accidentally initializing the
621 * bootmem allocator with an invalid RAM area.
623 reserve_bootmem(__pa_symbol(_text
), (PFN_PHYS(min_low_pfn
) +
624 bootmap_size
+ PAGE_SIZE
-1) - __pa_symbol(_text
),
628 * reserve physical page 0 - it's a special BIOS page on many boxes,
629 * enabling clean reboots, SMP operation, laptop functions.
631 reserve_bootmem(0, PAGE_SIZE
, BOOTMEM_DEFAULT
);
633 /* reserve EBDA region */
634 reserve_ebda_region();
638 * But first pinch a few for the stack/trampoline stuff
639 * FIXME: Don't need the extra page at 4K, but need to fix
640 * trampoline before removing it. (see the GDT stuff)
642 reserve_bootmem(PAGE_SIZE
, PAGE_SIZE
, BOOTMEM_DEFAULT
);
644 #ifdef CONFIG_ACPI_SLEEP
646 * Reserve low memory region for sleep support.
648 acpi_reserve_bootmem();
650 #ifdef CONFIG_X86_FIND_SMP_CONFIG
652 * Find and reserve possible boot-time SMP configuration:
656 #ifdef CONFIG_BLK_DEV_INITRD
660 reserve_crashkernel();
662 reserve_ibft_region();
666 * The node 0 pgdat is initialized before all of these because
667 * it's needed for bootmem. node>0 pgdats have their virtual
668 * space allocated before the pagetables are in place to access
669 * them, so they can't be cleared then.
671 * This should all compile down to nothing when NUMA is off.
673 static void __init
remapped_pgdat_init(void)
677 for_each_online_node(nid
) {
679 memset(NODE_DATA(nid
), 0, sizeof(struct pglist_data
));
684 static void set_mca_bus(int x
)
689 static void set_mca_bus(int x
) { }
694 * In the golden day, when everything among i386 and x86_64 will be
695 * integrated, this will not live here
697 void *x86_cpu_to_node_map_early_ptr
;
698 int x86_cpu_to_node_map_init
[NR_CPUS
] = {
699 [0 ... NR_CPUS
-1] = NUMA_NO_NODE
701 DEFINE_PER_CPU(int, x86_cpu_to_node_map
) = NUMA_NO_NODE
;
705 * Determine if we were loaded by an EFI loader. If so, then we have also been
706 * passed the efi memmap, systab, etc., so we should use these data structures
707 * for initialization. Note, the efi init code path is determined by the
708 * global efi_enabled. This allows the same kernel image to be used on existing
709 * systems (with a traditional BIOS) as well as on EFI systems.
711 void __init
setup_arch(char **cmdline_p
)
713 unsigned long max_low_pfn
;
715 memcpy(&boot_cpu_data
, &new_cpu_data
, sizeof(new_cpu_data
));
716 pre_setup_arch_hook();
718 early_ioremap_init();
721 if (!strncmp((char *)&boot_params
.efi_info
.efi_loader_signature
,
726 ROOT_DEV
= old_decode_dev(boot_params
.hdr
.root_dev
);
727 screen_info
= boot_params
.screen_info
;
728 edid_info
= boot_params
.edid_info
;
729 apm_info
.bios
= boot_params
.apm_bios_info
;
730 ist_info
= boot_params
.ist_info
;
731 saved_video_mode
= boot_params
.hdr
.vid_mode
;
732 if( boot_params
.sys_desc_table
.length
!= 0 ) {
733 set_mca_bus(boot_params
.sys_desc_table
.table
[3] & 0x2);
734 machine_id
= boot_params
.sys_desc_table
.table
[0];
735 machine_submodel_id
= boot_params
.sys_desc_table
.table
[1];
736 BIOS_revision
= boot_params
.sys_desc_table
.table
[2];
738 bootloader_type
= boot_params
.hdr
.type_of_loader
;
740 #ifdef CONFIG_BLK_DEV_RAM
741 rd_image_start
= boot_params
.hdr
.ram_size
& RAMDISK_IMAGE_START_MASK
;
742 rd_prompt
= ((boot_params
.hdr
.ram_size
& RAMDISK_PROMPT_FLAG
) != 0);
743 rd_doload
= ((boot_params
.hdr
.ram_size
& RAMDISK_LOAD_FLAG
) != 0);
751 if (!boot_params
.hdr
.root_flags
)
752 root_mountflags
&= ~MS_RDONLY
;
753 init_mm
.start_code
= (unsigned long) _text
;
754 init_mm
.end_code
= (unsigned long) _etext
;
755 init_mm
.end_data
= (unsigned long) _edata
;
756 init_mm
.brk
= init_pg_tables_end
+ PAGE_OFFSET
;
758 code_resource
.start
= virt_to_phys(_text
);
759 code_resource
.end
= virt_to_phys(_etext
)-1;
760 data_resource
.start
= virt_to_phys(_etext
);
761 data_resource
.end
= virt_to_phys(_edata
)-1;
762 bss_resource
.start
= virt_to_phys(&__bss_start
);
763 bss_resource
.end
= virt_to_phys(&__bss_stop
)-1;
767 finish_e820_parsing();
769 strlcpy(command_line
, boot_command_line
, COMMAND_LINE_SIZE
);
770 *cmdline_p
= command_line
;
775 /* update e820 for memory not covered by WB MTRRs */
776 propagate_e820_map();
778 if (mtrr_trim_uncached_memory(max_pfn
))
779 propagate_e820_map();
781 max_low_pfn
= setup_memory();
783 #ifdef CONFIG_KVM_CLOCK
789 * Must be after max_low_pfn is determined, and before kernel
790 * pagetables are setup.
797 * NOTE: before this point _nobody_ is allowed to allocate
798 * any memory using the bootmem allocator. Although the
799 * allocator is now initialised only the first 8Mb of the kernel
800 * virtual address space has been mapped. All allocations before
801 * paging_init() has completed must use the alloc_bootmem_low_pages()
802 * variant (which allocates DMA'able memory) and care must be taken
803 * not to exceed the 8Mb limit.
807 smp_alloc_memory(); /* AP processor realmode stacks in low memory*/
812 * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
815 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
816 if (init_ohci1394_dma_early
)
817 init_ohci1394_dma_on_all_controllers();
820 remapped_pgdat_init();
825 * NOTE: at this point the bootmem allocator is fully available.
828 #ifdef CONFIG_BLK_DEV_INITRD
832 paravirt_post_allocator_init();
838 #ifdef CONFIG_X86_SMP
840 * setup to use the early static init tables during kernel startup
841 * X86_SMP will exclude sub-arches that don't deal well with it.
843 x86_cpu_to_apicid_early_ptr
= (void *)x86_cpu_to_apicid_init
;
844 x86_bios_cpu_apicid_early_ptr
= (void *)x86_bios_cpu_apicid_init
;
846 x86_cpu_to_node_map_early_ptr
= (void *)x86_cpu_to_node_map_init
;
850 #ifdef CONFIG_X86_GENERICARCH
851 generic_apic_probe();
856 * Parse the ACPI tables for possible boot-time SMP configuration.
858 acpi_boot_table_init();
866 #if defined(CONFIG_SMP) && defined(CONFIG_X86_PC)
868 printk(KERN_WARNING
"More than 8 CPUs detected and "
869 "CONFIG_X86_PC cannot handle it.\nUse "
870 "CONFIG_X86_GENERICARCH or CONFIG_X86_BIGSMP.\n");
873 #ifdef CONFIG_X86_LOCAL_APIC
874 if (smp_found_config
)
879 e820_mark_nosave_regions();
882 #if defined(CONFIG_VGA_CONSOLE)
883 if (!efi_enabled
|| (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY
))
884 conswitchp
= &vga_con
;
885 #elif defined(CONFIG_DUMMY_CONSOLE)
886 conswitchp
= &dummy_con
;
892 * Request address space for all standard resources
894 * This is called just before pcibios_init(), which is also a
895 * subsys_initcall, but is linked in later (in arch/i386/pci/common.c).
897 static int __init
request_standard_resources(void)
901 printk(KERN_INFO
"Setting up standard PCI resources\n");
902 init_iomem_resources(&code_resource
, &data_resource
, &bss_resource
);
904 request_resource(&iomem_resource
, &video_ram_resource
);
906 /* request I/O space for devices used on all i[345]86 PCs */
907 for (i
= 0; i
< ARRAY_SIZE(standard_io_resources
); i
++)
908 request_resource(&ioport_resource
, &standard_io_resources
[i
]);
912 subsys_initcall(request_standard_resources
);