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/dmi.h>
46 #include <linux/pfn.h>
47 #include <linux/pci.h>
48 #include <asm/pci-direct.h>
49 #include <linux/init_ohci1394_dma.h>
50 #include <linux/kvm_para.h>
52 #include <linux/errno.h>
53 #include <linux/kernel.h>
54 #include <linux/stddef.h>
55 #include <linux/unistd.h>
56 #include <linux/ptrace.h>
57 #include <linux/slab.h>
58 #include <linux/user.h>
59 #include <linux/delay.h>
61 #include <linux/kallsyms.h>
62 #include <linux/cpufreq.h>
63 #include <linux/dma-mapping.h>
64 #include <linux/ctype.h>
65 #include <linux/uaccess.h>
67 #include <linux/percpu.h>
68 #include <linux/crash_dump.h>
70 #include <video/edid.h>
75 #include <asm/mpspec.h>
76 #include <asm/setup.h>
78 #include <asm/timer.h>
79 #include <asm/i8259.h>
80 #include <asm/sections.h>
82 #include <asm/io_apic.h>
85 #include <asm/setup_arch.h>
86 #include <asm/bios_ebda.h>
87 #include <asm/cacheflush.h>
88 #include <asm/processor.h>
91 #include <asm/system.h>
92 #include <asm/vsyscall.h>
96 #include <asm/iommu.h>
98 #include <asm/mmu_context.h>
99 #include <asm/proto.h>
101 #include <asm/paravirt.h>
102 #include <asm/hypervisor.h>
104 #include <asm/percpu.h>
105 #include <asm/topology.h>
106 #include <asm/apicdef.h>
108 #include <asm/numa_64.h>
112 * end_pfn only includes RAM, while max_pfn_mapped includes all e820 entries.
113 * The direct mapping extends to max_pfn_mapped, so that we can directly access
114 * apertures, ACPI and other tables without having to play with fixmaps.
116 unsigned long max_low_pfn_mapped
;
117 unsigned long max_pfn_mapped
;
119 RESERVE_BRK(dmi_alloc
, 65536);
121 unsigned int boot_cpu_id __read_mostly
;
123 static __initdata
unsigned long _brk_start
= (unsigned long)__brk_base
;
124 unsigned long _brk_end
= (unsigned long)__brk_base
;
127 int default_cpu_present_to_apicid(int mps_cpu
)
129 return __default_cpu_present_to_apicid(mps_cpu
);
132 int default_check_phys_apicid_present(int phys_apicid
)
134 return __default_check_phys_apicid_present(phys_apicid
);
138 #ifndef CONFIG_DEBUG_BOOT_PARAMS
139 struct boot_params __initdata boot_params
;
141 struct boot_params boot_params
;
147 static struct resource data_resource
= {
148 .name
= "Kernel data",
151 .flags
= IORESOURCE_BUSY
| IORESOURCE_MEM
154 static struct resource code_resource
= {
155 .name
= "Kernel code",
158 .flags
= IORESOURCE_BUSY
| IORESOURCE_MEM
161 static struct resource bss_resource
= {
162 .name
= "Kernel bss",
165 .flags
= IORESOURCE_BUSY
| IORESOURCE_MEM
170 /* cpu data as detected by the assembly code in head.S */
171 struct cpuinfo_x86 new_cpu_data __cpuinitdata
= {0, 0, 0, 0, -1, 1, 0, 0, -1};
172 /* common cpu data for all cpus */
173 struct cpuinfo_x86 boot_cpu_data __read_mostly
= {0, 0, 0, 0, -1, 1, 0, 0, -1};
174 EXPORT_SYMBOL(boot_cpu_data
);
175 static void set_mca_bus(int x
)
182 unsigned int def_to_bigsmp
;
184 /* for MCA, but anyone else can use it if they want */
185 unsigned int machine_id
;
186 unsigned int machine_submodel_id
;
187 unsigned int BIOS_revision
;
189 struct apm_info apm_info
;
190 EXPORT_SYMBOL(apm_info
);
192 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
193 defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
194 struct ist_info ist_info
;
195 EXPORT_SYMBOL(ist_info
);
197 struct ist_info ist_info
;
201 struct cpuinfo_x86 boot_cpu_data __read_mostly
= {
202 .x86_phys_bits
= MAX_PHYSMEM_BITS
,
204 EXPORT_SYMBOL(boot_cpu_data
);
208 #if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64)
209 unsigned long mmu_cr4_features
;
211 unsigned long mmu_cr4_features
= X86_CR4_PAE
;
214 /* Boot loader ID and version as integers, for the benefit of proc_dointvec */
215 int bootloader_type
, bootloader_version
;
220 struct screen_info screen_info
;
221 EXPORT_SYMBOL(screen_info
);
222 struct edid_info edid_info
;
223 EXPORT_SYMBOL_GPL(edid_info
);
225 extern int root_mountflags
;
227 unsigned long saved_video_mode
;
229 #define RAMDISK_IMAGE_START_MASK 0x07FF
230 #define RAMDISK_PROMPT_FLAG 0x8000
231 #define RAMDISK_LOAD_FLAG 0x4000
233 static char __initdata command_line
[COMMAND_LINE_SIZE
];
234 #ifdef CONFIG_CMDLINE_BOOL
235 static char __initdata builtin_cmdline
[COMMAND_LINE_SIZE
] = CONFIG_CMDLINE
;
238 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
240 #ifdef CONFIG_EDD_MODULE
244 * copy_edd() - Copy the BIOS EDD information
245 * from boot_params into a safe place.
248 static inline void copy_edd(void)
250 memcpy(edd
.mbr_signature
, boot_params
.edd_mbr_sig_buffer
,
251 sizeof(edd
.mbr_signature
));
252 memcpy(edd
.edd_info
, boot_params
.eddbuf
, sizeof(edd
.edd_info
));
253 edd
.mbr_signature_nr
= boot_params
.edd_mbr_sig_buf_entries
;
254 edd
.edd_info_nr
= boot_params
.eddbuf_entries
;
257 static inline void copy_edd(void)
262 void * __init
extend_brk(size_t size
, size_t align
)
264 size_t mask
= align
- 1;
267 BUG_ON(_brk_start
== 0);
268 BUG_ON(align
& mask
);
270 _brk_end
= (_brk_end
+ mask
) & ~mask
;
271 BUG_ON((char *)(_brk_end
+ size
) > __brk_limit
);
273 ret
= (void *)_brk_end
;
276 memset(ret
, 0, size
);
282 static void __init
init_gbpages(void)
284 if (direct_gbpages
&& cpu_has_gbpages
)
285 printk(KERN_INFO
"Using GB pages for direct mapping\n");
290 static inline void init_gbpages(void)
295 static void __init
reserve_brk(void)
297 if (_brk_end
> _brk_start
)
298 reserve_early(__pa(_brk_start
), __pa(_brk_end
), "BRK");
300 /* Mark brk area as locked down and no longer taking any
305 #ifdef CONFIG_BLK_DEV_INITRD
307 #define MAX_MAP_CHUNK (NR_FIX_BTMAPS << PAGE_SHIFT)
308 static void __init
relocate_initrd(void)
311 u64 ramdisk_image
= boot_params
.hdr
.ramdisk_image
;
312 u64 ramdisk_size
= boot_params
.hdr
.ramdisk_size
;
313 u64 end_of_lowmem
= max_low_pfn_mapped
<< PAGE_SHIFT
;
315 unsigned long slop
, clen
, mapaddr
;
318 /* We need to move the initrd down into lowmem */
319 ramdisk_here
= find_e820_area(0, end_of_lowmem
, ramdisk_size
,
322 if (ramdisk_here
== -1ULL)
323 panic("Cannot find place for new RAMDISK of size %lld\n",
326 /* Note: this includes all the lowmem currently occupied by
327 the initrd, we rely on that fact to keep the data intact. */
328 reserve_early(ramdisk_here
, ramdisk_here
+ ramdisk_size
,
330 initrd_start
= ramdisk_here
+ PAGE_OFFSET
;
331 initrd_end
= initrd_start
+ ramdisk_size
;
332 printk(KERN_INFO
"Allocated new RAMDISK: %08llx - %08llx\n",
333 ramdisk_here
, ramdisk_here
+ ramdisk_size
);
335 q
= (char *)initrd_start
;
337 /* Copy any lowmem portion of the initrd */
338 if (ramdisk_image
< end_of_lowmem
) {
339 clen
= end_of_lowmem
- ramdisk_image
;
340 p
= (char *)__va(ramdisk_image
);
343 ramdisk_image
+= clen
;
344 ramdisk_size
-= clen
;
347 /* Copy the highmem portion of the initrd */
348 while (ramdisk_size
) {
349 slop
= ramdisk_image
& ~PAGE_MASK
;
351 if (clen
> MAX_MAP_CHUNK
-slop
)
352 clen
= MAX_MAP_CHUNK
-slop
;
353 mapaddr
= ramdisk_image
& PAGE_MASK
;
354 p
= early_memremap(mapaddr
, clen
+slop
);
355 memcpy(q
, p
+slop
, clen
);
356 early_iounmap(p
, clen
+slop
);
358 ramdisk_image
+= clen
;
359 ramdisk_size
-= clen
;
361 /* high pages is not converted by early_res_to_bootmem */
362 ramdisk_image
= boot_params
.hdr
.ramdisk_image
;
363 ramdisk_size
= boot_params
.hdr
.ramdisk_size
;
364 printk(KERN_INFO
"Move RAMDISK from %016llx - %016llx to"
365 " %08llx - %08llx\n",
366 ramdisk_image
, ramdisk_image
+ ramdisk_size
- 1,
367 ramdisk_here
, ramdisk_here
+ ramdisk_size
- 1);
370 static void __init
reserve_initrd(void)
372 u64 ramdisk_image
= boot_params
.hdr
.ramdisk_image
;
373 u64 ramdisk_size
= boot_params
.hdr
.ramdisk_size
;
374 u64 ramdisk_end
= ramdisk_image
+ ramdisk_size
;
375 u64 end_of_lowmem
= max_low_pfn_mapped
<< PAGE_SHIFT
;
377 if (!boot_params
.hdr
.type_of_loader
||
378 !ramdisk_image
|| !ramdisk_size
)
379 return; /* No initrd provided by bootloader */
383 if (ramdisk_size
>= (end_of_lowmem
>>1)) {
384 free_early(ramdisk_image
, ramdisk_end
);
385 printk(KERN_ERR
"initrd too large to handle, "
386 "disabling initrd\n");
390 printk(KERN_INFO
"RAMDISK: %08llx - %08llx\n", ramdisk_image
,
394 if (ramdisk_end
<= end_of_lowmem
) {
395 /* All in lowmem, easy case */
397 * don't need to reserve again, already reserved early
398 * in i386_start_kernel
400 initrd_start
= ramdisk_image
+ PAGE_OFFSET
;
401 initrd_end
= initrd_start
+ ramdisk_size
;
407 free_early(ramdisk_image
, ramdisk_end
);
410 static void __init
reserve_initrd(void)
413 #endif /* CONFIG_BLK_DEV_INITRD */
415 static void __init
parse_setup_data(void)
417 struct setup_data
*data
;
420 if (boot_params
.hdr
.version
< 0x0209)
422 pa_data
= boot_params
.hdr
.setup_data
;
424 data
= early_memremap(pa_data
, PAGE_SIZE
);
425 switch (data
->type
) {
427 parse_e820_ext(data
, pa_data
);
432 pa_data
= data
->next
;
433 early_iounmap(data
, PAGE_SIZE
);
437 static void __init
e820_reserve_setup_data(void)
439 struct setup_data
*data
;
443 if (boot_params
.hdr
.version
< 0x0209)
445 pa_data
= boot_params
.hdr
.setup_data
;
447 data
= early_memremap(pa_data
, sizeof(*data
));
448 e820_update_range(pa_data
, sizeof(*data
)+data
->len
,
449 E820_RAM
, E820_RESERVED_KERN
);
451 pa_data
= data
->next
;
452 early_iounmap(data
, sizeof(*data
));
457 sanitize_e820_map(e820
.map
, ARRAY_SIZE(e820
.map
), &e820
.nr_map
);
458 memcpy(&e820_saved
, &e820
, sizeof(struct e820map
));
459 printk(KERN_INFO
"extended physical RAM map:\n");
460 e820_print_map("reserve setup_data");
463 static void __init
reserve_early_setup_data(void)
465 struct setup_data
*data
;
469 if (boot_params
.hdr
.version
< 0x0209)
471 pa_data
= boot_params
.hdr
.setup_data
;
473 data
= early_memremap(pa_data
, sizeof(*data
));
474 sprintf(buf
, "setup data %x", data
->type
);
475 reserve_early(pa_data
, pa_data
+sizeof(*data
)+data
->len
, buf
);
476 pa_data
= data
->next
;
477 early_iounmap(data
, sizeof(*data
));
482 * --------- Crashkernel reservation ------------------------------
488 * Reserve @size bytes of crashkernel memory at any suitable offset.
490 * @size: Size of the crashkernel memory to reserve.
491 * Returns the base address on success, and -1ULL on failure.
494 unsigned long long __init
find_and_reserve_crashkernel(unsigned long long size
)
496 const unsigned long long alignment
= 16<<20; /* 16M */
497 unsigned long long start
= 0LL;
502 start
= find_e820_area(start
, ULONG_MAX
, size
, alignment
);
506 /* try to reserve it */
507 ret
= reserve_bootmem_generic(start
, size
, BOOTMEM_EXCLUSIVE
);
515 static inline unsigned long long get_total_mem(void)
517 unsigned long long total
;
519 total
= max_low_pfn
- min_low_pfn
;
520 #ifdef CONFIG_HIGHMEM
521 total
+= highend_pfn
- highstart_pfn
;
524 return total
<< PAGE_SHIFT
;
527 static void __init
reserve_crashkernel(void)
529 unsigned long long total_mem
;
530 unsigned long long crash_size
, crash_base
;
533 total_mem
= get_total_mem();
535 ret
= parse_crashkernel(boot_command_line
, total_mem
,
536 &crash_size
, &crash_base
);
537 if (ret
!= 0 || crash_size
<= 0)
540 /* 0 means: find the address automatically */
541 if (crash_base
<= 0) {
542 crash_base
= find_and_reserve_crashkernel(crash_size
);
543 if (crash_base
== -1ULL) {
544 pr_info("crashkernel reservation failed. "
545 "No suitable area found.\n");
549 ret
= reserve_bootmem_generic(crash_base
, crash_size
,
552 pr_info("crashkernel reservation failed - "
553 "memory is in use\n");
558 printk(KERN_INFO
"Reserving %ldMB of memory at %ldMB "
559 "for crashkernel (System RAM: %ldMB)\n",
560 (unsigned long)(crash_size
>> 20),
561 (unsigned long)(crash_base
>> 20),
562 (unsigned long)(total_mem
>> 20));
564 crashk_res
.start
= crash_base
;
565 crashk_res
.end
= crash_base
+ crash_size
- 1;
566 insert_resource(&iomem_resource
, &crashk_res
);
569 static void __init
reserve_crashkernel(void)
574 static struct resource standard_io_resources
[] = {
575 { .name
= "dma1", .start
= 0x00, .end
= 0x1f,
576 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
577 { .name
= "pic1", .start
= 0x20, .end
= 0x21,
578 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
579 { .name
= "timer0", .start
= 0x40, .end
= 0x43,
580 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
581 { .name
= "timer1", .start
= 0x50, .end
= 0x53,
582 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
583 { .name
= "keyboard", .start
= 0x60, .end
= 0x60,
584 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
585 { .name
= "keyboard", .start
= 0x64, .end
= 0x64,
586 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
587 { .name
= "dma page reg", .start
= 0x80, .end
= 0x8f,
588 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
589 { .name
= "pic2", .start
= 0xa0, .end
= 0xa1,
590 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
591 { .name
= "dma2", .start
= 0xc0, .end
= 0xdf,
592 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
593 { .name
= "fpu", .start
= 0xf0, .end
= 0xff,
594 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
}
597 void __init
reserve_standard_io_resources(void)
601 /* request I/O space for devices used on all i[345]86 PCs */
602 for (i
= 0; i
< ARRAY_SIZE(standard_io_resources
); i
++)
603 request_resource(&ioport_resource
, &standard_io_resources
[i
]);
608 * Note: elfcorehdr_addr is not just limited to vmcore. It is also used by
609 * is_kdump_kernel() to determine if we are booting after a panic. Hence
610 * ifdef it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE.
613 #ifdef CONFIG_CRASH_DUMP
614 /* elfcorehdr= specifies the location of elf core header
615 * stored by the crashed kernel. This option will be passed
616 * by kexec loader to the capture kernel.
618 static int __init
setup_elfcorehdr(char *arg
)
623 elfcorehdr_addr
= memparse(arg
, &end
);
624 return end
> arg
? 0 : -EINVAL
;
626 early_param("elfcorehdr", setup_elfcorehdr
);
629 #ifdef CONFIG_X86_RESERVE_LOW_64K
630 static int __init
dmi_low_memory_corruption(const struct dmi_system_id
*d
)
633 "%s detected: BIOS may corrupt low RAM, working around it.\n",
636 e820_update_range(0, 0x10000, E820_RAM
, E820_RESERVED
);
637 sanitize_e820_map(e820
.map
, ARRAY_SIZE(e820
.map
), &e820
.nr_map
);
643 /* List of systems that have known low memory corruption BIOS problems */
644 static struct dmi_system_id __initdata bad_bios_dmi_table
[] = {
645 #ifdef CONFIG_X86_RESERVE_LOW_64K
647 .callback
= dmi_low_memory_corruption
,
650 DMI_MATCH(DMI_BIOS_VENDOR
, "American Megatrends Inc."),
654 .callback
= dmi_low_memory_corruption
,
655 .ident
= "Phoenix BIOS",
657 DMI_MATCH(DMI_BIOS_VENDOR
, "Phoenix Technologies"),
662 * AMI BIOS with low memory corruption was found on Intel DG45ID board.
663 * It hase different DMI_BIOS_VENDOR = "Intel Corp.", for now we will
664 * match only DMI_BOARD_NAME and see if there is more bad products
667 .callback
= dmi_low_memory_corruption
,
670 DMI_MATCH(DMI_BOARD_NAME
, "DG45ID"),
678 * Determine if we were loaded by an EFI loader. If so, then we have also been
679 * passed the efi memmap, systab, etc., so we should use these data structures
680 * for initialization. Note, the efi init code path is determined by the
681 * global efi_enabled. This allows the same kernel image to be used on existing
682 * systems (with a traditional BIOS) as well as on EFI systems.
685 * setup_arch - architecture-specific boot-time initializations
687 * Note: On x86_64, fixmaps are ready for use even before this is called.
690 void __init
setup_arch(char **cmdline_p
)
693 memcpy(&boot_cpu_data
, &new_cpu_data
, sizeof(new_cpu_data
));
694 visws_early_detect();
696 printk(KERN_INFO
"Command line: %s\n", boot_command_line
);
699 /* VMI may relocate the fixmap; do this before touching ioremap area */
703 early_ioremap_init();
705 ROOT_DEV
= old_decode_dev(boot_params
.hdr
.root_dev
);
706 screen_info
= boot_params
.screen_info
;
707 edid_info
= boot_params
.edid_info
;
709 apm_info
.bios
= boot_params
.apm_bios_info
;
710 ist_info
= boot_params
.ist_info
;
711 if (boot_params
.sys_desc_table
.length
!= 0) {
712 set_mca_bus(boot_params
.sys_desc_table
.table
[3] & 0x2);
713 machine_id
= boot_params
.sys_desc_table
.table
[0];
714 machine_submodel_id
= boot_params
.sys_desc_table
.table
[1];
715 BIOS_revision
= boot_params
.sys_desc_table
.table
[2];
718 saved_video_mode
= boot_params
.hdr
.vid_mode
;
719 bootloader_type
= boot_params
.hdr
.type_of_loader
;
720 if ((bootloader_type
>> 4) == 0xe) {
721 bootloader_type
&= 0xf;
722 bootloader_type
|= (boot_params
.hdr
.ext_loader_type
+0x10) << 4;
724 bootloader_version
= bootloader_type
& 0xf;
725 bootloader_version
|= boot_params
.hdr
.ext_loader_ver
<< 4;
727 #ifdef CONFIG_BLK_DEV_RAM
728 rd_image_start
= boot_params
.hdr
.ram_size
& RAMDISK_IMAGE_START_MASK
;
729 rd_prompt
= ((boot_params
.hdr
.ram_size
& RAMDISK_PROMPT_FLAG
) != 0);
730 rd_doload
= ((boot_params
.hdr
.ram_size
& RAMDISK_LOAD_FLAG
) != 0);
733 if (!strncmp((char *)&boot_params
.efi_info
.efi_loader_signature
,
745 x86_init
.oem
.arch_setup();
749 /* update the e820_saved too */
750 e820_reserve_setup_data();
754 if (!boot_params
.hdr
.root_flags
)
755 root_mountflags
&= ~MS_RDONLY
;
756 init_mm
.start_code
= (unsigned long) _text
;
757 init_mm
.end_code
= (unsigned long) _etext
;
758 init_mm
.end_data
= (unsigned long) _edata
;
759 init_mm
.brk
= _brk_end
;
761 code_resource
.start
= virt_to_phys(_text
);
762 code_resource
.end
= virt_to_phys(_etext
)-1;
763 data_resource
.start
= virt_to_phys(_etext
);
764 data_resource
.end
= virt_to_phys(_edata
)-1;
765 bss_resource
.start
= virt_to_phys(&__bss_start
);
766 bss_resource
.end
= virt_to_phys(&__bss_stop
)-1;
768 #ifdef CONFIG_CMDLINE_BOOL
769 #ifdef CONFIG_CMDLINE_OVERRIDE
770 strlcpy(boot_command_line
, builtin_cmdline
, COMMAND_LINE_SIZE
);
772 if (builtin_cmdline
[0]) {
773 /* append boot loader cmdline to builtin */
774 strlcat(builtin_cmdline
, " ", COMMAND_LINE_SIZE
);
775 strlcat(builtin_cmdline
, boot_command_line
, COMMAND_LINE_SIZE
);
776 strlcpy(boot_command_line
, builtin_cmdline
, COMMAND_LINE_SIZE
);
781 strlcpy(command_line
, boot_command_line
, COMMAND_LINE_SIZE
);
782 *cmdline_p
= command_line
;
790 /* Must be before kernel pagetables are setup */
793 /* after early param, so could get panic from serial */
794 reserve_early_setup_data();
796 if (acpi_mps_check()) {
797 #ifdef CONFIG_X86_LOCAL_APIC
800 setup_clear_cpu_cap(X86_FEATURE_APIC
);
804 if (pci_early_dump_regs
)
805 early_dump_pci_devices();
808 finish_e820_parsing();
815 dmi_check_system(bad_bios_dmi_table
);
818 * VMware detection requires dmi to be available, so this
819 * needs to be done after dmi_scan_machine, for the BP.
821 init_hypervisor_platform();
823 x86_init
.resources
.probe_roms();
825 /* after parse_early_param, so could debug it */
826 insert_resource(&iomem_resource
, &code_resource
);
827 insert_resource(&iomem_resource
, &data_resource
);
828 insert_resource(&iomem_resource
, &bss_resource
);
832 if (ppro_with_ram_bug()) {
833 e820_update_range(0x70000000ULL
, 0x40000ULL
, E820_RAM
,
835 sanitize_e820_map(e820
.map
, ARRAY_SIZE(e820
.map
), &e820
.nr_map
);
836 printk(KERN_INFO
"fixed physical RAM map:\n");
837 e820_print_map("bad_ppro");
840 early_gart_iommu_check();
844 * partially used pages are not usable - thus
845 * we are rounding upwards:
847 max_pfn
= e820_end_of_ram_pfn();
849 /* preallocate 4k for mptable mpc */
850 early_reserve_e820_mpc_new();
851 /* update e820 for memory not covered by WB MTRRs */
853 if (mtrr_trim_uncached_memory(max_pfn
))
854 max_pfn
= e820_end_of_ram_pfn();
857 /* max_low_pfn get updated here */
858 find_low_pfn_range();
860 num_physpages
= max_pfn
;
864 /* How many end-of-memory variables you have, grandma! */
865 /* need this before calling reserve_initrd */
866 if (max_pfn
> (1UL<<(32 - PAGE_SHIFT
)))
867 max_low_pfn
= e820_end_of_low_ram_pfn();
869 max_low_pfn
= max_pfn
;
871 high_memory
= (void *)__va(max_pfn
* PAGE_SIZE
- 1) + 1;
872 max_pfn_mapped
= KERNEL_IMAGE_SIZE
>> PAGE_SHIFT
;
875 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
876 setup_bios_corruption_check();
879 printk(KERN_DEBUG
"initial memory mapped : 0 - %08lx\n",
880 max_pfn_mapped
<<PAGE_SHIFT
);
886 /* max_pfn_mapped is updated here */
887 max_low_pfn_mapped
= init_memory_mapping(0, max_low_pfn
<<PAGE_SHIFT
);
888 max_pfn_mapped
= max_low_pfn_mapped
;
891 if (max_pfn
> max_low_pfn
) {
892 max_pfn_mapped
= init_memory_mapping(1UL<<32,
893 max_pfn
<<PAGE_SHIFT
);
894 /* can we preseve max_low_pfn ?*/
895 max_low_pfn
= max_pfn
;
900 * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
903 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
904 if (init_ohci1394_dma_early
)
905 init_ohci1394_dma_on_all_controllers();
915 * Parse the ACPI tables for possible boot-time SMP configuration.
917 acpi_boot_table_init();
919 early_acpi_boot_init();
921 #ifdef CONFIG_ACPI_NUMA
923 * Parse SRAT to discover nodes.
928 initmem_init(0, max_pfn
);
930 #ifdef CONFIG_ACPI_SLEEP
932 * Reserve low memory region for sleep support.
934 acpi_reserve_bootmem();
937 * Find and reserve possible boot-time SMP configuration:
941 reserve_crashkernel();
945 * dma32_reserve_bootmem() allocates bootmem which may conflict
946 * with the crashkernel command line, so do that after
947 * reserve_crashkernel()
949 dma32_reserve_bootmem();
952 reserve_ibft_region();
954 #ifdef CONFIG_KVM_CLOCK
958 x86_init
.paging
.pagetable_setup_start(swapper_pg_dir
);
960 x86_init
.paging
.pagetable_setup_done(swapper_pg_dir
);
966 generic_apic_probe();
971 * Read APIC and some other early information from ACPI tables.
976 * get boot-time SMP configuration:
978 if (smp_found_config
)
981 prefill_possible_map();
987 init_apic_mappings();
988 ioapic_init_mappings();
990 /* need to wait for io_apic is mapped */
995 e820_reserve_resources();
996 e820_mark_nosave_regions(max_low_pfn
);
998 x86_init
.resources
.reserve_resources();
1003 #if defined(CONFIG_VGA_CONSOLE)
1004 if (!efi_enabled
|| (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY
))
1005 conswitchp
= &vga_con
;
1006 #elif defined(CONFIG_DUMMY_CONSOLE)
1007 conswitchp
= &dummy_con
;
1010 x86_init
.oem
.banner();
1013 #ifdef CONFIG_X86_32
1015 static struct resource video_ram_resource
= {
1016 .name
= "Video RAM area",
1019 .flags
= IORESOURCE_BUSY
| IORESOURCE_MEM
1022 void __init
i386_reserve_resources(void)
1024 request_resource(&iomem_resource
, &video_ram_resource
);
1025 reserve_standard_io_resources();
1028 #endif /* CONFIG_X86_32 */