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>
96 #include <asm/mmu_context.h>
97 #include <asm/proto.h>
99 #include <mach_apic.h>
100 #include <asm/paravirt.h>
102 #include <asm/percpu.h>
103 #include <asm/topology.h>
104 #include <asm/apicdef.h>
106 #include <asm/numa_64.h>
113 #ifndef CONFIG_DEBUG_BOOT_PARAMS
114 struct boot_params __initdata boot_params
;
116 struct boot_params boot_params
;
122 static struct resource data_resource
= {
123 .name
= "Kernel data",
126 .flags
= IORESOURCE_BUSY
| IORESOURCE_MEM
129 static struct resource code_resource
= {
130 .name
= "Kernel code",
133 .flags
= IORESOURCE_BUSY
| IORESOURCE_MEM
136 static struct resource bss_resource
= {
137 .name
= "Kernel bss",
140 .flags
= IORESOURCE_BUSY
| IORESOURCE_MEM
145 /* This value is set up by the early boot code to point to the value
146 immediately after the boot time page tables. It contains a *physical*
147 address, and must not be in the .bss segment! */
148 unsigned long init_pg_tables_start __initdata
= ~0UL;
149 unsigned long init_pg_tables_end __initdata
= ~0UL;
151 static struct resource video_ram_resource
= {
152 .name
= "Video RAM area",
155 .flags
= IORESOURCE_BUSY
| IORESOURCE_MEM
158 /* cpu data as detected by the assembly code in head.S */
159 struct cpuinfo_x86 new_cpu_data __cpuinitdata
= {0, 0, 0, 0, -1, 1, 0, 0, -1};
160 /* common cpu data for all cpus */
161 struct cpuinfo_x86 boot_cpu_data __read_mostly
= {0, 0, 0, 0, -1, 1, 0, 0, -1};
162 EXPORT_SYMBOL(boot_cpu_data
);
163 static void set_mca_bus(int x
)
170 unsigned int def_to_bigsmp
;
172 /* for MCA, but anyone else can use it if they want */
173 unsigned int machine_id
;
174 unsigned int machine_submodel_id
;
175 unsigned int BIOS_revision
;
177 struct apm_info apm_info
;
178 EXPORT_SYMBOL(apm_info
);
180 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
181 defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
182 struct ist_info ist_info
;
183 EXPORT_SYMBOL(ist_info
);
185 struct ist_info ist_info
;
189 struct cpuinfo_x86 boot_cpu_data __read_mostly
;
190 EXPORT_SYMBOL(boot_cpu_data
);
194 #if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64)
195 unsigned long mmu_cr4_features
;
197 unsigned long mmu_cr4_features
= X86_CR4_PAE
;
200 /* Boot loader ID as an integer, for the benefit of proc_dointvec */
207 char dmi_alloc_data
[DMI_MAX_DATA
];
212 struct screen_info screen_info
;
213 EXPORT_SYMBOL(screen_info
);
214 struct edid_info edid_info
;
215 EXPORT_SYMBOL_GPL(edid_info
);
217 extern int root_mountflags
;
219 unsigned long saved_video_mode
;
221 #define RAMDISK_IMAGE_START_MASK 0x07FF
222 #define RAMDISK_PROMPT_FLAG 0x8000
223 #define RAMDISK_LOAD_FLAG 0x4000
225 static char __initdata command_line
[COMMAND_LINE_SIZE
];
226 #ifdef CONFIG_CMDLINE_BOOL
227 static char __initdata builtin_cmdline
[COMMAND_LINE_SIZE
] = CONFIG_CMDLINE
;
230 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
232 #ifdef CONFIG_EDD_MODULE
236 * copy_edd() - Copy the BIOS EDD information
237 * from boot_params into a safe place.
240 static inline void copy_edd(void)
242 memcpy(edd
.mbr_signature
, boot_params
.edd_mbr_sig_buffer
,
243 sizeof(edd
.mbr_signature
));
244 memcpy(edd
.edd_info
, boot_params
.eddbuf
, sizeof(edd
.edd_info
));
245 edd
.mbr_signature_nr
= boot_params
.edd_mbr_sig_buf_entries
;
246 edd
.edd_info_nr
= boot_params
.eddbuf_entries
;
249 static inline void copy_edd(void)
254 #ifdef CONFIG_BLK_DEV_INITRD
258 #define MAX_MAP_CHUNK (NR_FIX_BTMAPS << PAGE_SHIFT)
259 static void __init
relocate_initrd(void)
262 u64 ramdisk_image
= boot_params
.hdr
.ramdisk_image
;
263 u64 ramdisk_size
= boot_params
.hdr
.ramdisk_size
;
264 u64 end_of_lowmem
= max_low_pfn
<< PAGE_SHIFT
;
266 unsigned long slop
, clen
, mapaddr
;
269 /* We need to move the initrd down into lowmem */
270 ramdisk_here
= find_e820_area(0, end_of_lowmem
, ramdisk_size
,
273 if (ramdisk_here
== -1ULL)
274 panic("Cannot find place for new RAMDISK of size %lld\n",
277 /* Note: this includes all the lowmem currently occupied by
278 the initrd, we rely on that fact to keep the data intact. */
279 reserve_early(ramdisk_here
, ramdisk_here
+ ramdisk_size
,
281 initrd_start
= ramdisk_here
+ PAGE_OFFSET
;
282 initrd_end
= initrd_start
+ ramdisk_size
;
283 printk(KERN_INFO
"Allocated new RAMDISK: %08llx - %08llx\n",
284 ramdisk_here
, ramdisk_here
+ ramdisk_size
);
286 q
= (char *)initrd_start
;
288 /* Copy any lowmem portion of the initrd */
289 if (ramdisk_image
< end_of_lowmem
) {
290 clen
= end_of_lowmem
- ramdisk_image
;
291 p
= (char *)__va(ramdisk_image
);
294 ramdisk_image
+= clen
;
295 ramdisk_size
-= clen
;
298 /* Copy the highmem portion of the initrd */
299 while (ramdisk_size
) {
300 slop
= ramdisk_image
& ~PAGE_MASK
;
302 if (clen
> MAX_MAP_CHUNK
-slop
)
303 clen
= MAX_MAP_CHUNK
-slop
;
304 mapaddr
= ramdisk_image
& PAGE_MASK
;
305 p
= early_ioremap(mapaddr
, clen
+slop
);
306 memcpy(q
, p
+slop
, clen
);
307 early_iounmap(p
, clen
+slop
);
309 ramdisk_image
+= clen
;
310 ramdisk_size
-= clen
;
312 /* high pages is not converted by early_res_to_bootmem */
313 ramdisk_image
= boot_params
.hdr
.ramdisk_image
;
314 ramdisk_size
= boot_params
.hdr
.ramdisk_size
;
315 printk(KERN_INFO
"Move RAMDISK from %016llx - %016llx to"
316 " %08llx - %08llx\n",
317 ramdisk_image
, ramdisk_image
+ ramdisk_size
- 1,
318 ramdisk_here
, ramdisk_here
+ ramdisk_size
- 1);
322 static void __init
reserve_initrd(void)
324 u64 ramdisk_image
= boot_params
.hdr
.ramdisk_image
;
325 u64 ramdisk_size
= boot_params
.hdr
.ramdisk_size
;
326 u64 ramdisk_end
= ramdisk_image
+ ramdisk_size
;
327 u64 end_of_lowmem
= max_low_pfn
<< PAGE_SHIFT
;
329 if (!boot_params
.hdr
.type_of_loader
||
330 !ramdisk_image
|| !ramdisk_size
)
331 return; /* No initrd provided by bootloader */
335 if (ramdisk_size
>= (end_of_lowmem
>>1)) {
336 free_early(ramdisk_image
, ramdisk_end
);
337 printk(KERN_ERR
"initrd too large to handle, "
338 "disabling initrd\n");
342 printk(KERN_INFO
"RAMDISK: %08llx - %08llx\n", ramdisk_image
,
346 if (ramdisk_end
<= end_of_lowmem
) {
347 /* All in lowmem, easy case */
349 * don't need to reserve again, already reserved early
350 * in i386_start_kernel
352 initrd_start
= ramdisk_image
+ PAGE_OFFSET
;
353 initrd_end
= initrd_start
+ ramdisk_size
;
360 printk(KERN_ERR
"initrd extends beyond end of memory "
361 "(0x%08llx > 0x%08llx)\ndisabling initrd\n",
362 ramdisk_end
, end_of_lowmem
);
365 free_early(ramdisk_image
, ramdisk_end
);
368 static void __init
reserve_initrd(void)
371 #endif /* CONFIG_BLK_DEV_INITRD */
373 static void __init
parse_setup_data(void)
375 struct setup_data
*data
;
378 if (boot_params
.hdr
.version
< 0x0209)
380 pa_data
= boot_params
.hdr
.setup_data
;
382 data
= early_ioremap(pa_data
, PAGE_SIZE
);
383 switch (data
->type
) {
385 parse_e820_ext(data
, pa_data
);
390 pa_data
= data
->next
;
391 early_iounmap(data
, PAGE_SIZE
);
395 static void __init
e820_reserve_setup_data(void)
397 struct setup_data
*data
;
401 if (boot_params
.hdr
.version
< 0x0209)
403 pa_data
= boot_params
.hdr
.setup_data
;
405 data
= early_ioremap(pa_data
, sizeof(*data
));
406 e820_update_range(pa_data
, sizeof(*data
)+data
->len
,
407 E820_RAM
, E820_RESERVED_KERN
);
409 pa_data
= data
->next
;
410 early_iounmap(data
, sizeof(*data
));
415 sanitize_e820_map(e820
.map
, ARRAY_SIZE(e820
.map
), &e820
.nr_map
);
416 memcpy(&e820_saved
, &e820
, sizeof(struct e820map
));
417 printk(KERN_INFO
"extended physical RAM map:\n");
418 e820_print_map("reserve setup_data");
421 static void __init
reserve_early_setup_data(void)
423 struct setup_data
*data
;
427 if (boot_params
.hdr
.version
< 0x0209)
429 pa_data
= boot_params
.hdr
.setup_data
;
431 data
= early_ioremap(pa_data
, sizeof(*data
));
432 sprintf(buf
, "setup data %x", data
->type
);
433 reserve_early(pa_data
, pa_data
+sizeof(*data
)+data
->len
, buf
);
434 pa_data
= data
->next
;
435 early_iounmap(data
, sizeof(*data
));
440 * --------- Crashkernel reservation ------------------------------
446 * Reserve @size bytes of crashkernel memory at any suitable offset.
448 * @size: Size of the crashkernel memory to reserve.
449 * Returns the base address on success, and -1ULL on failure.
451 unsigned long long __init
find_and_reserve_crashkernel(unsigned long long size
)
453 const unsigned long long alignment
= 16<<20; /* 16M */
454 unsigned long long start
= 0LL;
459 start
= find_e820_area(start
, ULONG_MAX
, size
, alignment
);
463 /* try to reserve it */
464 ret
= reserve_bootmem_generic(start
, size
, BOOTMEM_EXCLUSIVE
);
472 static inline unsigned long long get_total_mem(void)
474 unsigned long long total
;
476 total
= max_low_pfn
- min_low_pfn
;
477 #ifdef CONFIG_HIGHMEM
478 total
+= highend_pfn
- highstart_pfn
;
481 return total
<< PAGE_SHIFT
;
484 static void __init
reserve_crashkernel(void)
486 unsigned long long total_mem
;
487 unsigned long long crash_size
, crash_base
;
490 total_mem
= get_total_mem();
492 ret
= parse_crashkernel(boot_command_line
, total_mem
,
493 &crash_size
, &crash_base
);
494 if (ret
!= 0 || crash_size
<= 0)
497 /* 0 means: find the address automatically */
498 if (crash_base
<= 0) {
499 crash_base
= find_and_reserve_crashkernel(crash_size
);
500 if (crash_base
== -1ULL) {
501 pr_info("crashkernel reservation failed. "
502 "No suitable area found.\n");
506 ret
= reserve_bootmem_generic(crash_base
, crash_size
,
509 pr_info("crashkernel reservation failed - "
510 "memory is in use\n");
515 printk(KERN_INFO
"Reserving %ldMB of memory at %ldMB "
516 "for crashkernel (System RAM: %ldMB)\n",
517 (unsigned long)(crash_size
>> 20),
518 (unsigned long)(crash_base
>> 20),
519 (unsigned long)(total_mem
>> 20));
521 crashk_res
.start
= crash_base
;
522 crashk_res
.end
= crash_base
+ crash_size
- 1;
523 insert_resource(&iomem_resource
, &crashk_res
);
526 static void __init
reserve_crashkernel(void)
531 static struct resource standard_io_resources
[] = {
532 { .name
= "dma1", .start
= 0x00, .end
= 0x1f,
533 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
534 { .name
= "pic1", .start
= 0x20, .end
= 0x21,
535 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
536 { .name
= "timer0", .start
= 0x40, .end
= 0x43,
537 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
538 { .name
= "timer1", .start
= 0x50, .end
= 0x53,
539 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
540 { .name
= "keyboard", .start
= 0x60, .end
= 0x60,
541 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
542 { .name
= "keyboard", .start
= 0x64, .end
= 0x64,
543 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
544 { .name
= "dma page reg", .start
= 0x80, .end
= 0x8f,
545 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
546 { .name
= "pic2", .start
= 0xa0, .end
= 0xa1,
547 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
548 { .name
= "dma2", .start
= 0xc0, .end
= 0xdf,
549 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
550 { .name
= "fpu", .start
= 0xf0, .end
= 0xff,
551 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
}
554 static void __init
reserve_standard_io_resources(void)
558 /* request I/O space for devices used on all i[345]86 PCs */
559 for (i
= 0; i
< ARRAY_SIZE(standard_io_resources
); i
++)
560 request_resource(&ioport_resource
, &standard_io_resources
[i
]);
564 #ifdef CONFIG_PROC_VMCORE
565 /* elfcorehdr= specifies the location of elf core header
566 * stored by the crashed kernel. This option will be passed
567 * by kexec loader to the capture kernel.
569 static int __init
setup_elfcorehdr(char *arg
)
574 elfcorehdr_addr
= memparse(arg
, &end
);
575 return end
> arg
? 0 : -EINVAL
;
577 early_param("elfcorehdr", setup_elfcorehdr
);
580 static struct x86_quirks default_x86_quirks __initdata
;
582 struct x86_quirks
*x86_quirks __initdata
= &default_x86_quirks
;
585 * Determine if we were loaded by an EFI loader. If so, then we have also been
586 * passed the efi memmap, systab, etc., so we should use these data structures
587 * for initialization. Note, the efi init code path is determined by the
588 * global efi_enabled. This allows the same kernel image to be used on existing
589 * systems (with a traditional BIOS) as well as on EFI systems.
592 * setup_arch - architecture-specific boot-time initializations
594 * Note: On x86_64, fixmaps are ready for use even before this is called.
597 void __init
setup_arch(char **cmdline_p
)
600 memcpy(&boot_cpu_data
, &new_cpu_data
, sizeof(new_cpu_data
));
601 visws_early_detect();
602 pre_setup_arch_hook();
604 printk(KERN_INFO
"Command line: %s\n", boot_command_line
);
608 early_ioremap_init();
610 ROOT_DEV
= old_decode_dev(boot_params
.hdr
.root_dev
);
611 screen_info
= boot_params
.screen_info
;
612 edid_info
= boot_params
.edid_info
;
614 apm_info
.bios
= boot_params
.apm_bios_info
;
615 ist_info
= boot_params
.ist_info
;
616 if (boot_params
.sys_desc_table
.length
!= 0) {
617 set_mca_bus(boot_params
.sys_desc_table
.table
[3] & 0x2);
618 machine_id
= boot_params
.sys_desc_table
.table
[0];
619 machine_submodel_id
= boot_params
.sys_desc_table
.table
[1];
620 BIOS_revision
= boot_params
.sys_desc_table
.table
[2];
623 saved_video_mode
= boot_params
.hdr
.vid_mode
;
624 bootloader_type
= boot_params
.hdr
.type_of_loader
;
626 #ifdef CONFIG_BLK_DEV_RAM
627 rd_image_start
= boot_params
.hdr
.ram_size
& RAMDISK_IMAGE_START_MASK
;
628 rd_prompt
= ((boot_params
.hdr
.ram_size
& RAMDISK_PROMPT_FLAG
) != 0);
629 rd_doload
= ((boot_params
.hdr
.ram_size
& RAMDISK_LOAD_FLAG
) != 0);
632 if (!strncmp((char *)&boot_params
.efi_info
.efi_loader_signature
,
648 /* update the e820_saved too */
649 e820_reserve_setup_data();
653 if (!boot_params
.hdr
.root_flags
)
654 root_mountflags
&= ~MS_RDONLY
;
655 init_mm
.start_code
= (unsigned long) _text
;
656 init_mm
.end_code
= (unsigned long) _etext
;
657 init_mm
.end_data
= (unsigned long) _edata
;
659 init_mm
.brk
= init_pg_tables_end
+ PAGE_OFFSET
;
661 init_mm
.brk
= (unsigned long) &_end
;
664 code_resource
.start
= virt_to_phys(_text
);
665 code_resource
.end
= virt_to_phys(_etext
)-1;
666 data_resource
.start
= virt_to_phys(_etext
);
667 data_resource
.end
= virt_to_phys(_edata
)-1;
668 bss_resource
.start
= virt_to_phys(&__bss_start
);
669 bss_resource
.end
= virt_to_phys(&__bss_stop
)-1;
671 #ifdef CONFIG_CMDLINE_BOOL
672 #ifdef CONFIG_CMDLINE_OVERRIDE
673 strlcpy(boot_command_line
, builtin_cmdline
, COMMAND_LINE_SIZE
);
675 if (builtin_cmdline
[0]) {
676 /* append boot loader cmdline to builtin */
677 strlcat(builtin_cmdline
, " ", COMMAND_LINE_SIZE
);
678 strlcat(builtin_cmdline
, boot_command_line
, COMMAND_LINE_SIZE
);
679 strlcpy(boot_command_line
, builtin_cmdline
, COMMAND_LINE_SIZE
);
684 strlcpy(command_line
, boot_command_line
, COMMAND_LINE_SIZE
);
685 *cmdline_p
= command_line
;
693 #if defined(CONFIG_VMI) && defined(CONFIG_X86_32)
695 * Must be before kernel pagetables are setup
696 * or fixmap area is touched.
701 /* after early param, so could get panic from serial */
702 reserve_early_setup_data();
704 if (acpi_mps_check()) {
705 #ifdef CONFIG_X86_LOCAL_APIC
708 setup_clear_cpu_cap(X86_FEATURE_APIC
);
712 if (pci_early_dump_regs
)
713 early_dump_pci_devices();
716 finish_e820_parsing();
722 /* after parse_early_param, so could debug it */
723 insert_resource(&iomem_resource
, &code_resource
);
724 insert_resource(&iomem_resource
, &data_resource
);
725 insert_resource(&iomem_resource
, &bss_resource
);
731 if (ppro_with_ram_bug()) {
732 e820_update_range(0x70000000ULL
, 0x40000ULL
, E820_RAM
,
734 sanitize_e820_map(e820
.map
, ARRAY_SIZE(e820
.map
), &e820
.nr_map
);
735 printk(KERN_INFO
"fixed physical RAM map:\n");
736 e820_print_map("bad_ppro");
739 early_gart_iommu_check();
743 * partially used pages are not usable - thus
744 * we are rounding upwards:
746 max_pfn
= e820_end_of_ram_pfn();
748 /* preallocate 4k for mptable mpc */
749 early_reserve_e820_mpc_new();
750 /* update e820 for memory not covered by WB MTRRs */
752 if (mtrr_trim_uncached_memory(max_pfn
))
753 max_pfn
= e820_end_of_ram_pfn();
756 /* max_low_pfn get updated here */
757 find_low_pfn_range();
759 num_physpages
= max_pfn
;
764 /* How many end-of-memory variables you have, grandma! */
765 /* need this before calling reserve_initrd */
766 if (max_pfn
> (1UL<<(32 - PAGE_SHIFT
)))
767 max_low_pfn
= e820_end_of_low_ram_pfn();
769 max_low_pfn
= max_pfn
;
771 high_memory
= (void *)__va(max_pfn
* PAGE_SIZE
- 1) + 1;
774 /* max_pfn_mapped is updated here */
775 max_low_pfn_mapped
= init_memory_mapping(0, max_low_pfn
<<PAGE_SHIFT
);
776 max_pfn_mapped
= max_low_pfn_mapped
;
779 if (max_pfn
> max_low_pfn
) {
780 max_pfn_mapped
= init_memory_mapping(1UL<<32,
781 max_pfn
<<PAGE_SHIFT
);
782 /* can we preseve max_low_pfn ?*/
783 max_low_pfn
= max_pfn
;
788 * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
791 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
792 if (init_ohci1394_dma_early
)
793 init_ohci1394_dma_on_all_controllers();
807 * Parse the ACPI tables for possible boot-time SMP configuration.
809 acpi_boot_table_init();
811 #ifdef CONFIG_ACPI_NUMA
813 * Parse SRAT to discover nodes.
818 initmem_init(0, max_pfn
);
820 #ifdef CONFIG_ACPI_SLEEP
822 * Reserve low memory region for sleep support.
824 acpi_reserve_bootmem();
826 #ifdef CONFIG_X86_FIND_SMP_CONFIG
828 * Find and reserve possible boot-time SMP configuration:
832 reserve_crashkernel();
836 * dma32_reserve_bootmem() allocates bootmem which may conflict
837 * with the crashkernel command line, so do that after
838 * reserve_crashkernel()
840 dma32_reserve_bootmem();
843 reserve_ibft_region();
845 #ifdef CONFIG_KVM_CLOCK
849 paravirt_pagetable_setup_start(swapper_pg_dir
);
851 paravirt_pagetable_setup_done(swapper_pg_dir
);
852 paravirt_post_allocator_init();
858 #ifdef CONFIG_X86_GENERICARCH
859 generic_apic_probe();
865 * Read APIC and some other early information from ACPI tables.
869 #if defined(CONFIG_X86_MPPARSE) || defined(CONFIG_X86_VISWS)
871 * get boot-time SMP configuration:
873 if (smp_found_config
)
877 prefill_possible_map();
882 init_apic_mappings();
883 ioapic_init_mappings();
887 e820_reserve_resources();
888 e820_mark_nosave_regions(max_low_pfn
);
891 request_resource(&iomem_resource
, &video_ram_resource
);
893 reserve_standard_io_resources();
898 #if defined(CONFIG_VGA_CONSOLE)
899 if (!efi_enabled
|| (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY
))
900 conswitchp
= &vga_con
;
901 #elif defined(CONFIG_DUMMY_CONSOLE)
902 conswitchp
= &dummy_con
;