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>
101 #include <asm/hypervisor.h>
103 #include <asm/percpu.h>
104 #include <asm/topology.h>
105 #include <asm/apicdef.h>
107 #include <asm/numa_64.h>
114 #ifndef CONFIG_DEBUG_BOOT_PARAMS
115 struct boot_params __initdata boot_params
;
117 struct boot_params boot_params
;
123 static struct resource data_resource
= {
124 .name
= "Kernel data",
127 .flags
= IORESOURCE_BUSY
| IORESOURCE_MEM
130 static struct resource code_resource
= {
131 .name
= "Kernel code",
134 .flags
= IORESOURCE_BUSY
| IORESOURCE_MEM
137 static struct resource bss_resource
= {
138 .name
= "Kernel bss",
141 .flags
= IORESOURCE_BUSY
| IORESOURCE_MEM
146 /* This value is set up by the early boot code to point to the value
147 immediately after the boot time page tables. It contains a *physical*
148 address, and must not be in the .bss segment! */
149 unsigned long init_pg_tables_start __initdata
= ~0UL;
150 unsigned long init_pg_tables_end __initdata
= ~0UL;
152 static struct resource video_ram_resource
= {
153 .name
= "Video RAM area",
156 .flags
= IORESOURCE_BUSY
| IORESOURCE_MEM
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
);
164 static void set_mca_bus(int x
)
171 unsigned int def_to_bigsmp
;
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 struct apm_info apm_info
;
179 EXPORT_SYMBOL(apm_info
);
181 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
182 defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
183 struct ist_info ist_info
;
184 EXPORT_SYMBOL(ist_info
);
186 struct ist_info ist_info
;
190 struct cpuinfo_x86 boot_cpu_data __read_mostly
;
191 EXPORT_SYMBOL(boot_cpu_data
);
195 #if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64)
196 unsigned long mmu_cr4_features
;
198 unsigned long mmu_cr4_features
= X86_CR4_PAE
;
201 /* Boot loader ID as an integer, for the benefit of proc_dointvec */
208 char dmi_alloc_data
[DMI_MAX_DATA
];
213 struct screen_info screen_info
;
214 EXPORT_SYMBOL(screen_info
);
215 struct edid_info edid_info
;
216 EXPORT_SYMBOL_GPL(edid_info
);
218 extern int root_mountflags
;
220 unsigned long saved_video_mode
;
222 #define RAMDISK_IMAGE_START_MASK 0x07FF
223 #define RAMDISK_PROMPT_FLAG 0x8000
224 #define RAMDISK_LOAD_FLAG 0x4000
226 static char __initdata command_line
[COMMAND_LINE_SIZE
];
227 #ifdef CONFIG_CMDLINE_BOOL
228 static char __initdata builtin_cmdline
[COMMAND_LINE_SIZE
] = CONFIG_CMDLINE
;
231 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
233 #ifdef CONFIG_EDD_MODULE
237 * copy_edd() - Copy the BIOS EDD information
238 * from boot_params into a safe place.
241 static inline void copy_edd(void)
243 memcpy(edd
.mbr_signature
, boot_params
.edd_mbr_sig_buffer
,
244 sizeof(edd
.mbr_signature
));
245 memcpy(edd
.edd_info
, boot_params
.eddbuf
, sizeof(edd
.edd_info
));
246 edd
.mbr_signature_nr
= boot_params
.edd_mbr_sig_buf_entries
;
247 edd
.edd_info_nr
= boot_params
.eddbuf_entries
;
250 static inline void copy_edd(void)
255 #ifdef CONFIG_BLK_DEV_INITRD
259 #define MAX_MAP_CHUNK (NR_FIX_BTMAPS << PAGE_SHIFT)
260 static void __init
relocate_initrd(void)
263 u64 ramdisk_image
= boot_params
.hdr
.ramdisk_image
;
264 u64 ramdisk_size
= boot_params
.hdr
.ramdisk_size
;
265 u64 end_of_lowmem
= max_low_pfn
<< PAGE_SHIFT
;
267 unsigned long slop
, clen
, mapaddr
;
270 /* We need to move the initrd down into lowmem */
271 ramdisk_here
= find_e820_area(0, end_of_lowmem
, ramdisk_size
,
274 if (ramdisk_here
== -1ULL)
275 panic("Cannot find place for new RAMDISK of size %lld\n",
278 /* Note: this includes all the lowmem currently occupied by
279 the initrd, we rely on that fact to keep the data intact. */
280 reserve_early(ramdisk_here
, ramdisk_here
+ ramdisk_size
,
282 initrd_start
= ramdisk_here
+ PAGE_OFFSET
;
283 initrd_end
= initrd_start
+ ramdisk_size
;
284 printk(KERN_INFO
"Allocated new RAMDISK: %08llx - %08llx\n",
285 ramdisk_here
, ramdisk_here
+ ramdisk_size
);
287 q
= (char *)initrd_start
;
289 /* Copy any lowmem portion of the initrd */
290 if (ramdisk_image
< end_of_lowmem
) {
291 clen
= end_of_lowmem
- ramdisk_image
;
292 p
= (char *)__va(ramdisk_image
);
295 ramdisk_image
+= clen
;
296 ramdisk_size
-= clen
;
299 /* Copy the highmem portion of the initrd */
300 while (ramdisk_size
) {
301 slop
= ramdisk_image
& ~PAGE_MASK
;
303 if (clen
> MAX_MAP_CHUNK
-slop
)
304 clen
= MAX_MAP_CHUNK
-slop
;
305 mapaddr
= ramdisk_image
& PAGE_MASK
;
306 p
= early_memremap(mapaddr
, clen
+slop
);
307 memcpy(q
, p
+slop
, clen
);
308 early_iounmap(p
, clen
+slop
);
310 ramdisk_image
+= clen
;
311 ramdisk_size
-= clen
;
313 /* high pages is not converted by early_res_to_bootmem */
314 ramdisk_image
= boot_params
.hdr
.ramdisk_image
;
315 ramdisk_size
= boot_params
.hdr
.ramdisk_size
;
316 printk(KERN_INFO
"Move RAMDISK from %016llx - %016llx to"
317 " %08llx - %08llx\n",
318 ramdisk_image
, ramdisk_image
+ ramdisk_size
- 1,
319 ramdisk_here
, ramdisk_here
+ ramdisk_size
- 1);
323 static void __init
reserve_initrd(void)
325 u64 ramdisk_image
= boot_params
.hdr
.ramdisk_image
;
326 u64 ramdisk_size
= boot_params
.hdr
.ramdisk_size
;
327 u64 ramdisk_end
= ramdisk_image
+ ramdisk_size
;
328 u64 end_of_lowmem
= max_low_pfn
<< PAGE_SHIFT
;
330 if (!boot_params
.hdr
.type_of_loader
||
331 !ramdisk_image
|| !ramdisk_size
)
332 return; /* No initrd provided by bootloader */
336 if (ramdisk_size
>= (end_of_lowmem
>>1)) {
337 free_early(ramdisk_image
, ramdisk_end
);
338 printk(KERN_ERR
"initrd too large to handle, "
339 "disabling initrd\n");
343 printk(KERN_INFO
"RAMDISK: %08llx - %08llx\n", ramdisk_image
,
347 if (ramdisk_end
<= end_of_lowmem
) {
348 /* All in lowmem, easy case */
350 * don't need to reserve again, already reserved early
351 * in i386_start_kernel
353 initrd_start
= ramdisk_image
+ PAGE_OFFSET
;
354 initrd_end
= initrd_start
+ ramdisk_size
;
361 printk(KERN_ERR
"initrd extends beyond end of memory "
362 "(0x%08llx > 0x%08llx)\ndisabling initrd\n",
363 ramdisk_end
, end_of_lowmem
);
366 free_early(ramdisk_image
, ramdisk_end
);
369 static void __init
reserve_initrd(void)
372 #endif /* CONFIG_BLK_DEV_INITRD */
374 static void __init
parse_setup_data(void)
376 struct setup_data
*data
;
379 if (boot_params
.hdr
.version
< 0x0209)
381 pa_data
= boot_params
.hdr
.setup_data
;
383 data
= early_memremap(pa_data
, PAGE_SIZE
);
384 switch (data
->type
) {
386 parse_e820_ext(data
, pa_data
);
391 pa_data
= data
->next
;
392 early_iounmap(data
, PAGE_SIZE
);
396 static void __init
e820_reserve_setup_data(void)
398 struct setup_data
*data
;
402 if (boot_params
.hdr
.version
< 0x0209)
404 pa_data
= boot_params
.hdr
.setup_data
;
406 data
= early_memremap(pa_data
, sizeof(*data
));
407 e820_update_range(pa_data
, sizeof(*data
)+data
->len
,
408 E820_RAM
, E820_RESERVED_KERN
);
410 pa_data
= data
->next
;
411 early_iounmap(data
, sizeof(*data
));
416 sanitize_e820_map(e820
.map
, ARRAY_SIZE(e820
.map
), &e820
.nr_map
);
417 memcpy(&e820_saved
, &e820
, sizeof(struct e820map
));
418 printk(KERN_INFO
"extended physical RAM map:\n");
419 e820_print_map("reserve setup_data");
422 static void __init
reserve_early_setup_data(void)
424 struct setup_data
*data
;
428 if (boot_params
.hdr
.version
< 0x0209)
430 pa_data
= boot_params
.hdr
.setup_data
;
432 data
= early_memremap(pa_data
, sizeof(*data
));
433 sprintf(buf
, "setup data %x", data
->type
);
434 reserve_early(pa_data
, pa_data
+sizeof(*data
)+data
->len
, buf
);
435 pa_data
= data
->next
;
436 early_iounmap(data
, sizeof(*data
));
441 * --------- Crashkernel reservation ------------------------------
447 * Reserve @size bytes of crashkernel memory at any suitable offset.
449 * @size: Size of the crashkernel memory to reserve.
450 * Returns the base address on success, and -1ULL on failure.
452 unsigned long long __init
find_and_reserve_crashkernel(unsigned long long size
)
454 const unsigned long long alignment
= 16<<20; /* 16M */
455 unsigned long long start
= 0LL;
460 start
= find_e820_area(start
, ULONG_MAX
, size
, alignment
);
464 /* try to reserve it */
465 ret
= reserve_bootmem_generic(start
, size
, BOOTMEM_EXCLUSIVE
);
473 static inline unsigned long long get_total_mem(void)
475 unsigned long long total
;
477 total
= max_low_pfn
- min_low_pfn
;
478 #ifdef CONFIG_HIGHMEM
479 total
+= highend_pfn
- highstart_pfn
;
482 return total
<< PAGE_SHIFT
;
485 static void __init
reserve_crashkernel(void)
487 unsigned long long total_mem
;
488 unsigned long long crash_size
, crash_base
;
491 total_mem
= get_total_mem();
493 ret
= parse_crashkernel(boot_command_line
, total_mem
,
494 &crash_size
, &crash_base
);
495 if (ret
!= 0 || crash_size
<= 0)
498 /* 0 means: find the address automatically */
499 if (crash_base
<= 0) {
500 crash_base
= find_and_reserve_crashkernel(crash_size
);
501 if (crash_base
== -1ULL) {
502 pr_info("crashkernel reservation failed. "
503 "No suitable area found.\n");
507 ret
= reserve_bootmem_generic(crash_base
, crash_size
,
510 pr_info("crashkernel reservation failed - "
511 "memory is in use\n");
516 printk(KERN_INFO
"Reserving %ldMB of memory at %ldMB "
517 "for crashkernel (System RAM: %ldMB)\n",
518 (unsigned long)(crash_size
>> 20),
519 (unsigned long)(crash_base
>> 20),
520 (unsigned long)(total_mem
>> 20));
522 crashk_res
.start
= crash_base
;
523 crashk_res
.end
= crash_base
+ crash_size
- 1;
524 insert_resource(&iomem_resource
, &crashk_res
);
527 static void __init
reserve_crashkernel(void)
532 static struct resource standard_io_resources
[] = {
533 { .name
= "dma1", .start
= 0x00, .end
= 0x1f,
534 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
535 { .name
= "pic1", .start
= 0x20, .end
= 0x21,
536 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
537 { .name
= "timer0", .start
= 0x40, .end
= 0x43,
538 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
539 { .name
= "timer1", .start
= 0x50, .end
= 0x53,
540 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
541 { .name
= "keyboard", .start
= 0x60, .end
= 0x60,
542 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
543 { .name
= "keyboard", .start
= 0x64, .end
= 0x64,
544 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
545 { .name
= "dma page reg", .start
= 0x80, .end
= 0x8f,
546 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
547 { .name
= "pic2", .start
= 0xa0, .end
= 0xa1,
548 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
549 { .name
= "dma2", .start
= 0xc0, .end
= 0xdf,
550 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
551 { .name
= "fpu", .start
= 0xf0, .end
= 0xff,
552 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
}
555 static void __init
reserve_standard_io_resources(void)
559 /* request I/O space for devices used on all i[345]86 PCs */
560 for (i
= 0; i
< ARRAY_SIZE(standard_io_resources
); i
++)
561 request_resource(&ioport_resource
, &standard_io_resources
[i
]);
566 * Note: elfcorehdr_addr is not just limited to vmcore. It is also used by
567 * is_kdump_kernel() to determine if we are booting after a panic. Hence
568 * ifdef it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE.
571 #ifdef CONFIG_CRASH_DUMP
572 /* elfcorehdr= specifies the location of elf core header
573 * stored by the crashed kernel. This option will be passed
574 * by kexec loader to the capture kernel.
576 static int __init
setup_elfcorehdr(char *arg
)
581 elfcorehdr_addr
= memparse(arg
, &end
);
582 return end
> arg
? 0 : -EINVAL
;
584 early_param("elfcorehdr", setup_elfcorehdr
);
587 static struct x86_quirks default_x86_quirks __initdata
;
589 struct x86_quirks
*x86_quirks __initdata
= &default_x86_quirks
;
592 * Some BIOSes seem to corrupt the low 64k of memory during events
593 * like suspend/resume and unplugging an HDMI cable. Reserve all
594 * remaining free memory in that area and fill it with a distinct
597 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
598 #define MAX_SCAN_AREAS 8
600 static int __read_mostly memory_corruption_check
= -1;
602 static unsigned __read_mostly corruption_check_size
= 64*1024;
603 static unsigned __read_mostly corruption_check_period
= 60; /* seconds */
605 static struct e820entry scan_areas
[MAX_SCAN_AREAS
];
606 static int num_scan_areas
;
609 static int set_corruption_check(char *arg
)
613 memory_corruption_check
= simple_strtol(arg
, &end
, 10);
615 return (*end
== 0) ? 0 : -EINVAL
;
617 early_param("memory_corruption_check", set_corruption_check
);
619 static int set_corruption_check_period(char *arg
)
623 corruption_check_period
= simple_strtoul(arg
, &end
, 10);
625 return (*end
== 0) ? 0 : -EINVAL
;
627 early_param("memory_corruption_check_period", set_corruption_check_period
);
629 static int set_corruption_check_size(char *arg
)
634 size
= memparse(arg
, &end
);
637 corruption_check_size
= size
;
639 return (size
== corruption_check_size
) ? 0 : -EINVAL
;
641 early_param("memory_corruption_check_size", set_corruption_check_size
);
644 static void __init
setup_bios_corruption_check(void)
646 u64 addr
= PAGE_SIZE
; /* assume first page is reserved anyway */
648 if (memory_corruption_check
== -1) {
649 memory_corruption_check
=
650 #ifdef CONFIG_X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK
658 if (corruption_check_size
== 0)
659 memory_corruption_check
= 0;
661 if (!memory_corruption_check
)
664 corruption_check_size
= round_up(corruption_check_size
, PAGE_SIZE
);
666 while(addr
< corruption_check_size
&& num_scan_areas
< MAX_SCAN_AREAS
) {
668 addr
= find_e820_area_size(addr
, &size
, PAGE_SIZE
);
673 if ((addr
+ size
) > corruption_check_size
)
674 size
= corruption_check_size
- addr
;
679 e820_update_range(addr
, size
, E820_RAM
, E820_RESERVED
);
680 scan_areas
[num_scan_areas
].addr
= addr
;
681 scan_areas
[num_scan_areas
].size
= size
;
684 /* Assume we've already mapped this early memory */
685 memset(__va(addr
), 0, size
);
690 printk(KERN_INFO
"Scanning %d areas for low memory corruption\n",
695 static struct timer_list periodic_check_timer
;
697 void check_for_bios_corruption(void)
702 if (!memory_corruption_check
)
705 for(i
= 0; i
< num_scan_areas
; i
++) {
706 unsigned long *addr
= __va(scan_areas
[i
].addr
);
707 unsigned long size
= scan_areas
[i
].size
;
709 for(; size
; addr
++, size
-= sizeof(unsigned long)) {
712 printk(KERN_ERR
"Corrupted low memory at %p (%lx phys) = %08lx\n",
713 addr
, __pa(addr
), *addr
);
719 WARN(corruption
, KERN_ERR
"Memory corruption detected in low memory\n");
722 static void periodic_check_for_corruption(unsigned long data
)
724 check_for_bios_corruption();
725 mod_timer(&periodic_check_timer
, round_jiffies(jiffies
+ corruption_check_period
*HZ
));
728 void start_periodic_check_for_corruption(void)
730 if (!memory_corruption_check
|| corruption_check_period
== 0)
733 printk(KERN_INFO
"Scanning for low memory corruption every %d seconds\n",
734 corruption_check_period
);
736 init_timer(&periodic_check_timer
);
737 periodic_check_timer
.function
= &periodic_check_for_corruption
;
738 periodic_check_for_corruption(0);
742 static int __init
dmi_low_memory_corruption(const struct dmi_system_id
*d
)
745 "%s detected: BIOS may corrupt low RAM, working it around.\n",
748 e820_update_range(0, 0x10000, E820_RAM
, E820_RESERVED
);
749 sanitize_e820_map(e820
.map
, ARRAY_SIZE(e820
.map
), &e820
.nr_map
);
754 /* List of systems that have known low memory corruption BIOS problems */
755 static struct dmi_system_id __initdata bad_bios_dmi_table
[] = {
756 #ifdef CONFIG_X86_RESERVE_LOW_64K
758 .callback
= dmi_low_memory_corruption
,
761 DMI_MATCH(DMI_BIOS_VENDOR
, "American Megatrends Inc."),
765 .callback
= dmi_low_memory_corruption
,
766 .ident
= "Phoenix BIOS",
768 DMI_MATCH(DMI_BIOS_VENDOR
, "Phoenix Technologies, LTD"),
776 * Determine if we were loaded by an EFI loader. If so, then we have also been
777 * passed the efi memmap, systab, etc., so we should use these data structures
778 * for initialization. Note, the efi init code path is determined by the
779 * global efi_enabled. This allows the same kernel image to be used on existing
780 * systems (with a traditional BIOS) as well as on EFI systems.
783 * setup_arch - architecture-specific boot-time initializations
785 * Note: On x86_64, fixmaps are ready for use even before this is called.
788 void __init
setup_arch(char **cmdline_p
)
791 memcpy(&boot_cpu_data
, &new_cpu_data
, sizeof(new_cpu_data
));
792 visws_early_detect();
793 pre_setup_arch_hook();
795 printk(KERN_INFO
"Command line: %s\n", boot_command_line
);
799 early_ioremap_init();
801 ROOT_DEV
= old_decode_dev(boot_params
.hdr
.root_dev
);
802 screen_info
= boot_params
.screen_info
;
803 edid_info
= boot_params
.edid_info
;
805 apm_info
.bios
= boot_params
.apm_bios_info
;
806 ist_info
= boot_params
.ist_info
;
807 if (boot_params
.sys_desc_table
.length
!= 0) {
808 set_mca_bus(boot_params
.sys_desc_table
.table
[3] & 0x2);
809 machine_id
= boot_params
.sys_desc_table
.table
[0];
810 machine_submodel_id
= boot_params
.sys_desc_table
.table
[1];
811 BIOS_revision
= boot_params
.sys_desc_table
.table
[2];
814 saved_video_mode
= boot_params
.hdr
.vid_mode
;
815 bootloader_type
= boot_params
.hdr
.type_of_loader
;
817 #ifdef CONFIG_BLK_DEV_RAM
818 rd_image_start
= boot_params
.hdr
.ram_size
& RAMDISK_IMAGE_START_MASK
;
819 rd_prompt
= ((boot_params
.hdr
.ram_size
& RAMDISK_PROMPT_FLAG
) != 0);
820 rd_doload
= ((boot_params
.hdr
.ram_size
& RAMDISK_LOAD_FLAG
) != 0);
823 if (!strncmp((char *)&boot_params
.efi_info
.efi_loader_signature
,
839 /* update the e820_saved too */
840 e820_reserve_setup_data();
844 if (!boot_params
.hdr
.root_flags
)
845 root_mountflags
&= ~MS_RDONLY
;
846 init_mm
.start_code
= (unsigned long) _text
;
847 init_mm
.end_code
= (unsigned long) _etext
;
848 init_mm
.end_data
= (unsigned long) _edata
;
850 init_mm
.brk
= init_pg_tables_end
+ PAGE_OFFSET
;
852 init_mm
.brk
= (unsigned long) &_end
;
855 code_resource
.start
= virt_to_phys(_text
);
856 code_resource
.end
= virt_to_phys(_etext
)-1;
857 data_resource
.start
= virt_to_phys(_etext
);
858 data_resource
.end
= virt_to_phys(_edata
)-1;
859 bss_resource
.start
= virt_to_phys(&__bss_start
);
860 bss_resource
.end
= virt_to_phys(&__bss_stop
)-1;
862 #ifdef CONFIG_CMDLINE_BOOL
863 #ifdef CONFIG_CMDLINE_OVERRIDE
864 strlcpy(boot_command_line
, builtin_cmdline
, COMMAND_LINE_SIZE
);
866 if (builtin_cmdline
[0]) {
867 /* append boot loader cmdline to builtin */
868 strlcat(builtin_cmdline
, " ", COMMAND_LINE_SIZE
);
869 strlcat(builtin_cmdline
, boot_command_line
, COMMAND_LINE_SIZE
);
870 strlcpy(boot_command_line
, builtin_cmdline
, COMMAND_LINE_SIZE
);
875 strlcpy(command_line
, boot_command_line
, COMMAND_LINE_SIZE
);
876 *cmdline_p
= command_line
;
884 #if defined(CONFIG_VMI) && defined(CONFIG_X86_32)
886 * Must be before kernel pagetables are setup
887 * or fixmap area is touched.
892 /* after early param, so could get panic from serial */
893 reserve_early_setup_data();
895 if (acpi_mps_check()) {
896 #ifdef CONFIG_X86_LOCAL_APIC
899 setup_clear_cpu_cap(X86_FEATURE_APIC
);
903 if (pci_early_dump_regs
)
904 early_dump_pci_devices();
907 finish_e820_parsing();
911 dmi_check_system(bad_bios_dmi_table
);
914 * VMware detection requires dmi to be available, so this
915 * needs to be done after dmi_scan_machine, for the BP.
917 init_hypervisor(&boot_cpu_data
);
923 /* after parse_early_param, so could debug it */
924 insert_resource(&iomem_resource
, &code_resource
);
925 insert_resource(&iomem_resource
, &data_resource
);
926 insert_resource(&iomem_resource
, &bss_resource
);
932 if (ppro_with_ram_bug()) {
933 e820_update_range(0x70000000ULL
, 0x40000ULL
, E820_RAM
,
935 sanitize_e820_map(e820
.map
, ARRAY_SIZE(e820
.map
), &e820
.nr_map
);
936 printk(KERN_INFO
"fixed physical RAM map:\n");
937 e820_print_map("bad_ppro");
940 early_gart_iommu_check();
944 * partially used pages are not usable - thus
945 * we are rounding upwards:
947 max_pfn
= e820_end_of_ram_pfn();
949 /* preallocate 4k for mptable mpc */
950 early_reserve_e820_mpc_new();
951 /* update e820 for memory not covered by WB MTRRs */
953 if (mtrr_trim_uncached_memory(max_pfn
))
954 max_pfn
= e820_end_of_ram_pfn();
957 /* max_low_pfn get updated here */
958 find_low_pfn_range();
960 num_physpages
= max_pfn
;
965 /* How many end-of-memory variables you have, grandma! */
966 /* need this before calling reserve_initrd */
967 if (max_pfn
> (1UL<<(32 - PAGE_SHIFT
)))
968 max_low_pfn
= e820_end_of_low_ram_pfn();
970 max_low_pfn
= max_pfn
;
972 high_memory
= (void *)__va(max_pfn
* PAGE_SIZE
- 1) + 1;
975 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
976 setup_bios_corruption_check();
979 /* max_pfn_mapped is updated here */
980 max_low_pfn_mapped
= init_memory_mapping(0, max_low_pfn
<<PAGE_SHIFT
);
981 max_pfn_mapped
= max_low_pfn_mapped
;
984 if (max_pfn
> max_low_pfn
) {
985 max_pfn_mapped
= init_memory_mapping(1UL<<32,
986 max_pfn
<<PAGE_SHIFT
);
987 /* can we preseve max_low_pfn ?*/
988 max_low_pfn
= max_pfn
;
993 * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
996 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
997 if (init_ohci1394_dma_early
)
998 init_ohci1394_dma_on_all_controllers();
1003 #ifdef CONFIG_X86_64
1010 * Parse the ACPI tables for possible boot-time SMP configuration.
1012 acpi_boot_table_init();
1014 early_acpi_boot_init();
1016 #ifdef CONFIG_ACPI_NUMA
1018 * Parse SRAT to discover nodes.
1023 initmem_init(0, max_pfn
);
1025 #ifdef CONFIG_ACPI_SLEEP
1027 * Reserve low memory region for sleep support.
1029 acpi_reserve_bootmem();
1031 #ifdef CONFIG_X86_FIND_SMP_CONFIG
1033 * Find and reserve possible boot-time SMP configuration:
1037 reserve_crashkernel();
1039 #ifdef CONFIG_X86_64
1041 * dma32_reserve_bootmem() allocates bootmem which may conflict
1042 * with the crashkernel command line, so do that after
1043 * reserve_crashkernel()
1045 dma32_reserve_bootmem();
1048 reserve_ibft_region();
1050 #ifdef CONFIG_KVM_CLOCK
1054 paravirt_pagetable_setup_start(swapper_pg_dir
);
1056 paravirt_pagetable_setup_done(swapper_pg_dir
);
1057 paravirt_post_allocator_init();
1059 #ifdef CONFIG_X86_64
1063 #ifdef CONFIG_X86_GENERICARCH
1064 generic_apic_probe();
1070 * Read APIC and some other early information from ACPI tables.
1074 #if defined(CONFIG_X86_MPPARSE) || defined(CONFIG_X86_VISWS)
1076 * get boot-time SMP configuration:
1078 if (smp_found_config
)
1082 prefill_possible_map();
1084 #ifdef CONFIG_X86_64
1088 init_apic_mappings();
1089 ioapic_init_mappings();
1091 /* need to wait for io_apic is mapped */
1092 nr_irqs
= probe_nr_irqs();
1096 e820_reserve_resources();
1097 e820_mark_nosave_regions(max_low_pfn
);
1099 #ifdef CONFIG_X86_32
1100 request_resource(&iomem_resource
, &video_ram_resource
);
1102 reserve_standard_io_resources();
1107 #if defined(CONFIG_VGA_CONSOLE)
1108 if (!efi_enabled
|| (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY
))
1109 conswitchp
= &vga_con
;
1110 #elif defined(CONFIG_DUMMY_CONSOLE)
1111 conswitchp
= &dummy_con
;