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>
77 #include <asm/arch_hooks.h>
79 #include <asm/sections.h>
81 #include <asm/io_apic.h>
84 #include <setup_arch.h>
85 #include <asm/bios_ebda.h>
86 #include <asm/cacheflush.h>
87 #include <asm/processor.h>
90 #include <asm/system.h>
91 #include <asm/vsyscall.h>
95 #include <asm/iommu.h>
97 #include <asm/mmu_context.h>
98 #include <asm/proto.h>
100 #include <mach_apic.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>
115 #ifndef CONFIG_DEBUG_BOOT_PARAMS
116 struct boot_params __initdata boot_params
;
118 struct boot_params boot_params
;
124 static struct resource data_resource
= {
125 .name
= "Kernel data",
128 .flags
= IORESOURCE_BUSY
| IORESOURCE_MEM
131 static struct resource code_resource
= {
132 .name
= "Kernel code",
135 .flags
= IORESOURCE_BUSY
| IORESOURCE_MEM
138 static struct resource bss_resource
= {
139 .name
= "Kernel bss",
142 .flags
= IORESOURCE_BUSY
| IORESOURCE_MEM
147 /* This value is set up by the early boot code to point to the value
148 immediately after the boot time page tables. It contains a *physical*
149 address, and must not be in the .bss segment! */
150 unsigned long init_pg_tables_start __initdata
= ~0UL;
151 unsigned long init_pg_tables_end __initdata
= ~0UL;
153 static struct resource video_ram_resource
= {
154 .name
= "Video RAM area",
157 .flags
= IORESOURCE_BUSY
| IORESOURCE_MEM
160 /* cpu data as detected by the assembly code in head.S */
161 struct cpuinfo_x86 new_cpu_data __cpuinitdata
= {0, 0, 0, 0, -1, 1, 0, 0, -1};
162 /* common cpu data for all cpus */
163 struct cpuinfo_x86 boot_cpu_data __read_mostly
= {0, 0, 0, 0, -1, 1, 0, 0, -1};
164 EXPORT_SYMBOL(boot_cpu_data
);
165 static void set_mca_bus(int x
)
172 unsigned int def_to_bigsmp
;
174 /* for MCA, but anyone else can use it if they want */
175 unsigned int machine_id
;
176 unsigned int machine_submodel_id
;
177 unsigned int BIOS_revision
;
179 struct apm_info apm_info
;
180 EXPORT_SYMBOL(apm_info
);
182 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
183 defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
184 struct ist_info ist_info
;
185 EXPORT_SYMBOL(ist_info
);
187 struct ist_info ist_info
;
191 struct cpuinfo_x86 boot_cpu_data __read_mostly
;
192 EXPORT_SYMBOL(boot_cpu_data
);
196 #if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64)
197 unsigned long mmu_cr4_features
;
199 unsigned long mmu_cr4_features
= X86_CR4_PAE
;
202 /* Boot loader ID as an integer, for the benefit of proc_dointvec */
209 char dmi_alloc_data
[DMI_MAX_DATA
];
214 struct screen_info screen_info
;
215 EXPORT_SYMBOL(screen_info
);
216 struct edid_info edid_info
;
217 EXPORT_SYMBOL_GPL(edid_info
);
219 extern int root_mountflags
;
221 unsigned long saved_video_mode
;
223 #define RAMDISK_IMAGE_START_MASK 0x07FF
224 #define RAMDISK_PROMPT_FLAG 0x8000
225 #define RAMDISK_LOAD_FLAG 0x4000
227 static char __initdata command_line
[COMMAND_LINE_SIZE
];
228 #ifdef CONFIG_CMDLINE_BOOL
229 static char __initdata builtin_cmdline
[COMMAND_LINE_SIZE
] = CONFIG_CMDLINE
;
232 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
234 #ifdef CONFIG_EDD_MODULE
238 * copy_edd() - Copy the BIOS EDD information
239 * from boot_params into a safe place.
242 static inline void copy_edd(void)
244 memcpy(edd
.mbr_signature
, boot_params
.edd_mbr_sig_buffer
,
245 sizeof(edd
.mbr_signature
));
246 memcpy(edd
.edd_info
, boot_params
.eddbuf
, sizeof(edd
.edd_info
));
247 edd
.mbr_signature_nr
= boot_params
.edd_mbr_sig_buf_entries
;
248 edd
.edd_info_nr
= boot_params
.eddbuf_entries
;
251 static inline void copy_edd(void)
256 #ifdef CONFIG_BLK_DEV_INITRD
260 #define MAX_MAP_CHUNK (NR_FIX_BTMAPS << PAGE_SHIFT)
261 static void __init
relocate_initrd(void)
264 u64 ramdisk_image
= boot_params
.hdr
.ramdisk_image
;
265 u64 ramdisk_size
= boot_params
.hdr
.ramdisk_size
;
266 u64 end_of_lowmem
= max_low_pfn
<< PAGE_SHIFT
;
268 unsigned long slop
, clen
, mapaddr
;
271 /* We need to move the initrd down into lowmem */
272 ramdisk_here
= find_e820_area(0, end_of_lowmem
, ramdisk_size
,
275 if (ramdisk_here
== -1ULL)
276 panic("Cannot find place for new RAMDISK of size %lld\n",
279 /* Note: this includes all the lowmem currently occupied by
280 the initrd, we rely on that fact to keep the data intact. */
281 reserve_early(ramdisk_here
, ramdisk_here
+ ramdisk_size
,
283 initrd_start
= ramdisk_here
+ PAGE_OFFSET
;
284 initrd_end
= initrd_start
+ ramdisk_size
;
285 printk(KERN_INFO
"Allocated new RAMDISK: %08llx - %08llx\n",
286 ramdisk_here
, ramdisk_here
+ ramdisk_size
);
288 q
= (char *)initrd_start
;
290 /* Copy any lowmem portion of the initrd */
291 if (ramdisk_image
< end_of_lowmem
) {
292 clen
= end_of_lowmem
- ramdisk_image
;
293 p
= (char *)__va(ramdisk_image
);
296 ramdisk_image
+= clen
;
297 ramdisk_size
-= clen
;
300 /* Copy the highmem portion of the initrd */
301 while (ramdisk_size
) {
302 slop
= ramdisk_image
& ~PAGE_MASK
;
304 if (clen
> MAX_MAP_CHUNK
-slop
)
305 clen
= MAX_MAP_CHUNK
-slop
;
306 mapaddr
= ramdisk_image
& PAGE_MASK
;
307 p
= early_memremap(mapaddr
, clen
+slop
);
308 memcpy(q
, p
+slop
, clen
);
309 early_iounmap(p
, clen
+slop
);
311 ramdisk_image
+= clen
;
312 ramdisk_size
-= clen
;
314 /* high pages is not converted by early_res_to_bootmem */
315 ramdisk_image
= boot_params
.hdr
.ramdisk_image
;
316 ramdisk_size
= boot_params
.hdr
.ramdisk_size
;
317 printk(KERN_INFO
"Move RAMDISK from %016llx - %016llx to"
318 " %08llx - %08llx\n",
319 ramdisk_image
, ramdisk_image
+ ramdisk_size
- 1,
320 ramdisk_here
, ramdisk_here
+ ramdisk_size
- 1);
324 static void __init
reserve_initrd(void)
326 u64 ramdisk_image
= boot_params
.hdr
.ramdisk_image
;
327 u64 ramdisk_size
= boot_params
.hdr
.ramdisk_size
;
328 u64 ramdisk_end
= ramdisk_image
+ ramdisk_size
;
329 u64 end_of_lowmem
= max_low_pfn
<< PAGE_SHIFT
;
331 if (!boot_params
.hdr
.type_of_loader
||
332 !ramdisk_image
|| !ramdisk_size
)
333 return; /* No initrd provided by bootloader */
337 if (ramdisk_size
>= (end_of_lowmem
>>1)) {
338 free_early(ramdisk_image
, ramdisk_end
);
339 printk(KERN_ERR
"initrd too large to handle, "
340 "disabling initrd\n");
344 printk(KERN_INFO
"RAMDISK: %08llx - %08llx\n", ramdisk_image
,
348 if (ramdisk_end
<= end_of_lowmem
) {
349 /* All in lowmem, easy case */
351 * don't need to reserve again, already reserved early
352 * in i386_start_kernel
354 initrd_start
= ramdisk_image
+ PAGE_OFFSET
;
355 initrd_end
= initrd_start
+ ramdisk_size
;
362 printk(KERN_ERR
"initrd extends beyond end of memory "
363 "(0x%08llx > 0x%08llx)\ndisabling initrd\n",
364 ramdisk_end
, end_of_lowmem
);
367 free_early(ramdisk_image
, ramdisk_end
);
370 static void __init
reserve_initrd(void)
373 #endif /* CONFIG_BLK_DEV_INITRD */
375 static void __init
parse_setup_data(void)
377 struct setup_data
*data
;
380 if (boot_params
.hdr
.version
< 0x0209)
382 pa_data
= boot_params
.hdr
.setup_data
;
384 data
= early_memremap(pa_data
, PAGE_SIZE
);
385 switch (data
->type
) {
387 parse_e820_ext(data
, pa_data
);
392 pa_data
= data
->next
;
393 early_iounmap(data
, PAGE_SIZE
);
397 static void __init
e820_reserve_setup_data(void)
399 struct setup_data
*data
;
403 if (boot_params
.hdr
.version
< 0x0209)
405 pa_data
= boot_params
.hdr
.setup_data
;
407 data
= early_memremap(pa_data
, sizeof(*data
));
408 e820_update_range(pa_data
, sizeof(*data
)+data
->len
,
409 E820_RAM
, E820_RESERVED_KERN
);
411 pa_data
= data
->next
;
412 early_iounmap(data
, sizeof(*data
));
417 sanitize_e820_map(e820
.map
, ARRAY_SIZE(e820
.map
), &e820
.nr_map
);
418 memcpy(&e820_saved
, &e820
, sizeof(struct e820map
));
419 printk(KERN_INFO
"extended physical RAM map:\n");
420 e820_print_map("reserve setup_data");
423 static void __init
reserve_early_setup_data(void)
425 struct setup_data
*data
;
429 if (boot_params
.hdr
.version
< 0x0209)
431 pa_data
= boot_params
.hdr
.setup_data
;
433 data
= early_memremap(pa_data
, sizeof(*data
));
434 sprintf(buf
, "setup data %x", data
->type
);
435 reserve_early(pa_data
, pa_data
+sizeof(*data
)+data
->len
, buf
);
436 pa_data
= data
->next
;
437 early_iounmap(data
, sizeof(*data
));
442 * --------- Crashkernel reservation ------------------------------
448 * Reserve @size bytes of crashkernel memory at any suitable offset.
450 * @size: Size of the crashkernel memory to reserve.
451 * Returns the base address on success, and -1ULL on failure.
454 unsigned long long __init
find_and_reserve_crashkernel(unsigned long long size
)
456 const unsigned long long alignment
= 16<<20; /* 16M */
457 unsigned long long start
= 0LL;
462 start
= find_e820_area(start
, ULONG_MAX
, size
, alignment
);
466 /* try to reserve it */
467 ret
= reserve_bootmem_generic(start
, size
, BOOTMEM_EXCLUSIVE
);
475 static inline unsigned long long get_total_mem(void)
477 unsigned long long total
;
479 total
= max_low_pfn
- min_low_pfn
;
480 #ifdef CONFIG_HIGHMEM
481 total
+= highend_pfn
- highstart_pfn
;
484 return total
<< PAGE_SHIFT
;
487 static void __init
reserve_crashkernel(void)
489 unsigned long long total_mem
;
490 unsigned long long crash_size
, crash_base
;
493 total_mem
= get_total_mem();
495 ret
= parse_crashkernel(boot_command_line
, total_mem
,
496 &crash_size
, &crash_base
);
497 if (ret
!= 0 || crash_size
<= 0)
500 /* 0 means: find the address automatically */
501 if (crash_base
<= 0) {
502 crash_base
= find_and_reserve_crashkernel(crash_size
);
503 if (crash_base
== -1ULL) {
504 pr_info("crashkernel reservation failed. "
505 "No suitable area found.\n");
509 ret
= reserve_bootmem_generic(crash_base
, crash_size
,
512 pr_info("crashkernel reservation failed - "
513 "memory is in use\n");
518 printk(KERN_INFO
"Reserving %ldMB of memory at %ldMB "
519 "for crashkernel (System RAM: %ldMB)\n",
520 (unsigned long)(crash_size
>> 20),
521 (unsigned long)(crash_base
>> 20),
522 (unsigned long)(total_mem
>> 20));
524 crashk_res
.start
= crash_base
;
525 crashk_res
.end
= crash_base
+ crash_size
- 1;
526 insert_resource(&iomem_resource
, &crashk_res
);
529 static void __init
reserve_crashkernel(void)
534 static struct resource standard_io_resources
[] = {
535 { .name
= "dma1", .start
= 0x00, .end
= 0x1f,
536 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
537 { .name
= "pic1", .start
= 0x20, .end
= 0x21,
538 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
539 { .name
= "timer0", .start
= 0x40, .end
= 0x43,
540 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
541 { .name
= "timer1", .start
= 0x50, .end
= 0x53,
542 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
543 { .name
= "keyboard", .start
= 0x60, .end
= 0x60,
544 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
545 { .name
= "keyboard", .start
= 0x64, .end
= 0x64,
546 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
547 { .name
= "dma page reg", .start
= 0x80, .end
= 0x8f,
548 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
549 { .name
= "pic2", .start
= 0xa0, .end
= 0xa1,
550 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
551 { .name
= "dma2", .start
= 0xc0, .end
= 0xdf,
552 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
553 { .name
= "fpu", .start
= 0xf0, .end
= 0xff,
554 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
}
557 static void __init
reserve_standard_io_resources(void)
561 /* request I/O space for devices used on all i[345]86 PCs */
562 for (i
= 0; i
< ARRAY_SIZE(standard_io_resources
); i
++)
563 request_resource(&ioport_resource
, &standard_io_resources
[i
]);
568 * Note: elfcorehdr_addr is not just limited to vmcore. It is also used by
569 * is_kdump_kernel() to determine if we are booting after a panic. Hence
570 * ifdef it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE.
573 #ifdef CONFIG_CRASH_DUMP
574 /* elfcorehdr= specifies the location of elf core header
575 * stored by the crashed kernel. This option will be passed
576 * by kexec loader to the capture kernel.
578 static int __init
setup_elfcorehdr(char *arg
)
583 elfcorehdr_addr
= memparse(arg
, &end
);
584 return end
> arg
? 0 : -EINVAL
;
586 early_param("elfcorehdr", setup_elfcorehdr
);
589 static int __init
default_update_genapic(void)
591 #ifdef CONFIG_X86_SMP
592 if (!apic
->wakeup_cpu
)
593 apic
->wakeup_cpu
= wakeup_secondary_cpu_via_init
;
599 static struct x86_quirks default_x86_quirks __initdata
= {
600 .update_genapic
= default_update_genapic
,
603 struct x86_quirks
*x86_quirks __initdata
= &default_x86_quirks
;
605 #ifdef CONFIG_X86_RESERVE_LOW_64K
606 static int __init
dmi_low_memory_corruption(const struct dmi_system_id
*d
)
609 "%s detected: BIOS may corrupt low RAM, working it around.\n",
612 e820_update_range(0, 0x10000, E820_RAM
, E820_RESERVED
);
613 sanitize_e820_map(e820
.map
, ARRAY_SIZE(e820
.map
), &e820
.nr_map
);
619 /* List of systems that have known low memory corruption BIOS problems */
620 static struct dmi_system_id __initdata bad_bios_dmi_table
[] = {
621 #ifdef CONFIG_X86_RESERVE_LOW_64K
623 .callback
= dmi_low_memory_corruption
,
626 DMI_MATCH(DMI_BIOS_VENDOR
, "American Megatrends Inc."),
630 .callback
= dmi_low_memory_corruption
,
631 .ident
= "Phoenix BIOS",
633 DMI_MATCH(DMI_BIOS_VENDOR
, "Phoenix Technologies"),
641 * Determine if we were loaded by an EFI loader. If so, then we have also been
642 * passed the efi memmap, systab, etc., so we should use these data structures
643 * for initialization. Note, the efi init code path is determined by the
644 * global efi_enabled. This allows the same kernel image to be used on existing
645 * systems (with a traditional BIOS) as well as on EFI systems.
648 * setup_arch - architecture-specific boot-time initializations
650 * Note: On x86_64, fixmaps are ready for use even before this is called.
653 void __init
setup_arch(char **cmdline_p
)
656 memcpy(&boot_cpu_data
, &new_cpu_data
, sizeof(new_cpu_data
));
657 visws_early_detect();
658 pre_setup_arch_hook();
660 printk(KERN_INFO
"Command line: %s\n", boot_command_line
);
663 /* VMI may relocate the fixmap; do this before touching ioremap area */
667 early_ioremap_init();
669 ROOT_DEV
= old_decode_dev(boot_params
.hdr
.root_dev
);
670 screen_info
= boot_params
.screen_info
;
671 edid_info
= boot_params
.edid_info
;
673 apm_info
.bios
= boot_params
.apm_bios_info
;
674 ist_info
= boot_params
.ist_info
;
675 if (boot_params
.sys_desc_table
.length
!= 0) {
676 set_mca_bus(boot_params
.sys_desc_table
.table
[3] & 0x2);
677 machine_id
= boot_params
.sys_desc_table
.table
[0];
678 machine_submodel_id
= boot_params
.sys_desc_table
.table
[1];
679 BIOS_revision
= boot_params
.sys_desc_table
.table
[2];
682 saved_video_mode
= boot_params
.hdr
.vid_mode
;
683 bootloader_type
= boot_params
.hdr
.type_of_loader
;
685 #ifdef CONFIG_BLK_DEV_RAM
686 rd_image_start
= boot_params
.hdr
.ram_size
& RAMDISK_IMAGE_START_MASK
;
687 rd_prompt
= ((boot_params
.hdr
.ram_size
& RAMDISK_PROMPT_FLAG
) != 0);
688 rd_doload
= ((boot_params
.hdr
.ram_size
& RAMDISK_LOAD_FLAG
) != 0);
691 if (!strncmp((char *)&boot_params
.efi_info
.efi_loader_signature
,
707 /* update the e820_saved too */
708 e820_reserve_setup_data();
712 if (!boot_params
.hdr
.root_flags
)
713 root_mountflags
&= ~MS_RDONLY
;
714 init_mm
.start_code
= (unsigned long) _text
;
715 init_mm
.end_code
= (unsigned long) _etext
;
716 init_mm
.end_data
= (unsigned long) _edata
;
718 init_mm
.brk
= init_pg_tables_end
+ PAGE_OFFSET
;
720 init_mm
.brk
= (unsigned long) &_end
;
723 code_resource
.start
= virt_to_phys(_text
);
724 code_resource
.end
= virt_to_phys(_etext
)-1;
725 data_resource
.start
= virt_to_phys(_etext
);
726 data_resource
.end
= virt_to_phys(_edata
)-1;
727 bss_resource
.start
= virt_to_phys(&__bss_start
);
728 bss_resource
.end
= virt_to_phys(&__bss_stop
)-1;
730 #ifdef CONFIG_CMDLINE_BOOL
731 #ifdef CONFIG_CMDLINE_OVERRIDE
732 strlcpy(boot_command_line
, builtin_cmdline
, COMMAND_LINE_SIZE
);
734 if (builtin_cmdline
[0]) {
735 /* append boot loader cmdline to builtin */
736 strlcat(builtin_cmdline
, " ", COMMAND_LINE_SIZE
);
737 strlcat(builtin_cmdline
, boot_command_line
, COMMAND_LINE_SIZE
);
738 strlcpy(boot_command_line
, builtin_cmdline
, COMMAND_LINE_SIZE
);
743 strlcpy(command_line
, boot_command_line
, COMMAND_LINE_SIZE
);
744 *cmdline_p
= command_line
;
752 /* Must be before kernel pagetables are setup */
755 /* after early param, so could get panic from serial */
756 reserve_early_setup_data();
758 if (acpi_mps_check()) {
759 #ifdef CONFIG_X86_LOCAL_APIC
762 setup_clear_cpu_cap(X86_FEATURE_APIC
);
766 if (pci_early_dump_regs
)
767 early_dump_pci_devices();
770 finish_e820_parsing();
774 dmi_check_system(bad_bios_dmi_table
);
777 * VMware detection requires dmi to be available, so this
778 * needs to be done after dmi_scan_machine, for the BP.
780 init_hypervisor(&boot_cpu_data
);
786 /* after parse_early_param, so could debug it */
787 insert_resource(&iomem_resource
, &code_resource
);
788 insert_resource(&iomem_resource
, &data_resource
);
789 insert_resource(&iomem_resource
, &bss_resource
);
795 if (ppro_with_ram_bug()) {
796 e820_update_range(0x70000000ULL
, 0x40000ULL
, E820_RAM
,
798 sanitize_e820_map(e820
.map
, ARRAY_SIZE(e820
.map
), &e820
.nr_map
);
799 printk(KERN_INFO
"fixed physical RAM map:\n");
800 e820_print_map("bad_ppro");
803 early_gart_iommu_check();
807 * partially used pages are not usable - thus
808 * we are rounding upwards:
810 max_pfn
= e820_end_of_ram_pfn();
812 /* preallocate 4k for mptable mpc */
813 early_reserve_e820_mpc_new();
814 /* update e820 for memory not covered by WB MTRRs */
816 if (mtrr_trim_uncached_memory(max_pfn
))
817 max_pfn
= e820_end_of_ram_pfn();
820 /* max_low_pfn get updated here */
821 find_low_pfn_range();
823 num_physpages
= max_pfn
;
828 /* How many end-of-memory variables you have, grandma! */
829 /* need this before calling reserve_initrd */
830 if (max_pfn
> (1UL<<(32 - PAGE_SHIFT
)))
831 max_low_pfn
= e820_end_of_low_ram_pfn();
833 max_low_pfn
= max_pfn
;
835 high_memory
= (void *)__va(max_pfn
* PAGE_SIZE
- 1) + 1;
838 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
839 setup_bios_corruption_check();
842 /* max_pfn_mapped is updated here */
843 max_low_pfn_mapped
= init_memory_mapping(0, max_low_pfn
<<PAGE_SHIFT
);
844 max_pfn_mapped
= max_low_pfn_mapped
;
847 if (max_pfn
> max_low_pfn
) {
848 max_pfn_mapped
= init_memory_mapping(1UL<<32,
849 max_pfn
<<PAGE_SHIFT
);
850 /* can we preseve max_low_pfn ?*/
851 max_low_pfn
= max_pfn
;
856 * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
859 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
860 if (init_ohci1394_dma_early
)
861 init_ohci1394_dma_on_all_controllers();
873 * Parse the ACPI tables for possible boot-time SMP configuration.
875 acpi_boot_table_init();
877 early_acpi_boot_init();
879 #ifdef CONFIG_ACPI_NUMA
881 * Parse SRAT to discover nodes.
886 initmem_init(0, max_pfn
);
888 #ifdef CONFIG_ACPI_SLEEP
890 * Reserve low memory region for sleep support.
892 acpi_reserve_bootmem();
894 #ifdef CONFIG_X86_FIND_SMP_CONFIG
896 * Find and reserve possible boot-time SMP configuration:
900 reserve_crashkernel();
904 * dma32_reserve_bootmem() allocates bootmem which may conflict
905 * with the crashkernel command line, so do that after
906 * reserve_crashkernel()
908 dma32_reserve_bootmem();
911 reserve_ibft_region();
913 #ifdef CONFIG_KVM_CLOCK
917 paravirt_pagetable_setup_start(swapper_pg_dir
);
919 paravirt_pagetable_setup_done(swapper_pg_dir
);
920 paravirt_post_allocator_init();
926 #ifdef CONFIG_X86_GENERICARCH
927 generic_apic_probe();
933 * Read APIC and some other early information from ACPI tables.
937 #if defined(CONFIG_X86_MPPARSE) || defined(CONFIG_X86_VISWS)
939 * get boot-time SMP configuration:
941 if (smp_found_config
)
945 prefill_possible_map();
951 init_apic_mappings();
952 ioapic_init_mappings();
954 /* need to wait for io_apic is mapped */
959 e820_reserve_resources();
960 e820_mark_nosave_regions(max_low_pfn
);
963 request_resource(&iomem_resource
, &video_ram_resource
);
965 reserve_standard_io_resources();
970 #if defined(CONFIG_VGA_CONSOLE)
971 if (!efi_enabled
|| (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY
))
972 conswitchp
= &vga_con
;
973 #elif defined(CONFIG_DUMMY_CONSOLE)
974 conswitchp
= &dummy_con
;