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/sfi.h>
31 #include <linux/apm_bios.h>
32 #include <linux/initrd.h>
33 #include <linux/bootmem.h>
34 #include <linux/seq_file.h>
35 #include <linux/console.h>
36 #include <linux/mca.h>
37 #include <linux/root_dev.h>
38 #include <linux/highmem.h>
39 #include <linux/module.h>
40 #include <linux/efi.h>
41 #include <linux/init.h>
42 #include <linux/edd.h>
43 #include <linux/iscsi_ibft.h>
44 #include <linux/nodemask.h>
45 #include <linux/kexec.h>
46 #include <linux/dmi.h>
47 #include <linux/pfn.h>
48 #include <linux/pci.h>
49 #include <asm/pci-direct.h>
50 #include <linux/init_ohci1394_dma.h>
51 #include <linux/kvm_para.h>
53 #include <linux/errno.h>
54 #include <linux/kernel.h>
55 #include <linux/stddef.h>
56 #include <linux/unistd.h>
57 #include <linux/ptrace.h>
58 #include <linux/slab.h>
59 #include <linux/user.h>
60 #include <linux/delay.h>
62 #include <linux/kallsyms.h>
63 #include <linux/cpufreq.h>
64 #include <linux/dma-mapping.h>
65 #include <linux/ctype.h>
66 #include <linux/uaccess.h>
68 #include <linux/percpu.h>
69 #include <linux/crash_dump.h>
70 #include <linux/tboot.h>
72 #include <video/edid.h>
76 #include <asm/trampoline.h>
78 #include <asm/mpspec.h>
79 #include <asm/setup.h>
81 #include <asm/timer.h>
82 #include <asm/i8259.h>
83 #include <asm/sections.h>
85 #include <asm/io_apic.h>
88 #include <asm/setup_arch.h>
89 #include <asm/bios_ebda.h>
90 #include <asm/cacheflush.h>
91 #include <asm/processor.h>
94 #include <asm/system.h>
95 #include <asm/vsyscall.h>
99 #include <asm/iommu.h>
100 #include <asm/gart.h>
101 #include <asm/mmu_context.h>
102 #include <asm/proto.h>
104 #include <asm/paravirt.h>
105 #include <asm/hypervisor.h>
107 #include <asm/percpu.h>
108 #include <asm/topology.h>
109 #include <asm/apicdef.h>
112 #include <asm/numa_64.h>
117 * end_pfn only includes RAM, while max_pfn_mapped includes all e820 entries.
118 * The direct mapping extends to max_pfn_mapped, so that we can directly access
119 * apertures, ACPI and other tables without having to play with fixmaps.
121 unsigned long max_low_pfn_mapped
;
122 unsigned long max_pfn_mapped
;
124 RESERVE_BRK(dmi_alloc
, 65536);
126 unsigned int boot_cpu_id __read_mostly
;
128 static __initdata
unsigned long _brk_start
= (unsigned long)__brk_base
;
129 unsigned long _brk_end
= (unsigned long)__brk_base
;
132 int default_cpu_present_to_apicid(int mps_cpu
)
134 return __default_cpu_present_to_apicid(mps_cpu
);
137 int default_check_phys_apicid_present(int phys_apicid
)
139 return __default_check_phys_apicid_present(phys_apicid
);
143 #ifndef CONFIG_DEBUG_BOOT_PARAMS
144 struct boot_params __initdata boot_params
;
146 struct boot_params boot_params
;
152 static struct resource data_resource
= {
153 .name
= "Kernel data",
156 .flags
= IORESOURCE_BUSY
| IORESOURCE_MEM
159 static struct resource code_resource
= {
160 .name
= "Kernel code",
163 .flags
= IORESOURCE_BUSY
| IORESOURCE_MEM
166 static struct resource bss_resource
= {
167 .name
= "Kernel bss",
170 .flags
= IORESOURCE_BUSY
| IORESOURCE_MEM
175 /* cpu data as detected by the assembly code in head.S */
176 struct cpuinfo_x86 new_cpu_data __cpuinitdata
= {0, 0, 0, 0, -1, 1, 0, 0, -1};
177 /* common cpu data for all cpus */
178 struct cpuinfo_x86 boot_cpu_data __read_mostly
= {0, 0, 0, 0, -1, 1, 0, 0, -1};
179 EXPORT_SYMBOL(boot_cpu_data
);
180 static void set_mca_bus(int x
)
187 unsigned int def_to_bigsmp
;
189 /* for MCA, but anyone else can use it if they want */
190 unsigned int machine_id
;
191 unsigned int machine_submodel_id
;
192 unsigned int BIOS_revision
;
194 struct apm_info apm_info
;
195 EXPORT_SYMBOL(apm_info
);
197 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
198 defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
199 struct ist_info ist_info
;
200 EXPORT_SYMBOL(ist_info
);
202 struct ist_info ist_info
;
206 struct cpuinfo_x86 boot_cpu_data __read_mostly
= {
207 .x86_phys_bits
= MAX_PHYSMEM_BITS
,
209 EXPORT_SYMBOL(boot_cpu_data
);
213 #if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64)
214 unsigned long mmu_cr4_features
;
216 unsigned long mmu_cr4_features
= X86_CR4_PAE
;
219 /* Boot loader ID and version as integers, for the benefit of proc_dointvec */
220 int bootloader_type
, bootloader_version
;
225 struct screen_info screen_info
;
226 EXPORT_SYMBOL(screen_info
);
227 struct edid_info edid_info
;
228 EXPORT_SYMBOL_GPL(edid_info
);
230 extern int root_mountflags
;
232 unsigned long saved_video_mode
;
234 #define RAMDISK_IMAGE_START_MASK 0x07FF
235 #define RAMDISK_PROMPT_FLAG 0x8000
236 #define RAMDISK_LOAD_FLAG 0x4000
238 static char __initdata command_line
[COMMAND_LINE_SIZE
];
239 #ifdef CONFIG_CMDLINE_BOOL
240 static char __initdata builtin_cmdline
[COMMAND_LINE_SIZE
] = CONFIG_CMDLINE
;
243 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
245 #ifdef CONFIG_EDD_MODULE
249 * copy_edd() - Copy the BIOS EDD information
250 * from boot_params into a safe place.
253 static inline void __init
copy_edd(void)
255 memcpy(edd
.mbr_signature
, boot_params
.edd_mbr_sig_buffer
,
256 sizeof(edd
.mbr_signature
));
257 memcpy(edd
.edd_info
, boot_params
.eddbuf
, sizeof(edd
.edd_info
));
258 edd
.mbr_signature_nr
= boot_params
.edd_mbr_sig_buf_entries
;
259 edd
.edd_info_nr
= boot_params
.eddbuf_entries
;
262 static inline void __init
copy_edd(void)
267 void * __init
extend_brk(size_t size
, size_t align
)
269 size_t mask
= align
- 1;
272 BUG_ON(_brk_start
== 0);
273 BUG_ON(align
& mask
);
275 _brk_end
= (_brk_end
+ mask
) & ~mask
;
276 BUG_ON((char *)(_brk_end
+ size
) > __brk_limit
);
278 ret
= (void *)_brk_end
;
281 memset(ret
, 0, size
);
287 static void __init
init_gbpages(void)
289 if (direct_gbpages
&& cpu_has_gbpages
)
290 printk(KERN_INFO
"Using GB pages for direct mapping\n");
295 static inline void init_gbpages(void)
300 static void __init
reserve_brk(void)
302 if (_brk_end
> _brk_start
)
303 reserve_early(__pa(_brk_start
), __pa(_brk_end
), "BRK");
305 /* Mark brk area as locked down and no longer taking any
310 #ifdef CONFIG_BLK_DEV_INITRD
312 #define MAX_MAP_CHUNK (NR_FIX_BTMAPS << PAGE_SHIFT)
313 static void __init
relocate_initrd(void)
316 u64 ramdisk_image
= boot_params
.hdr
.ramdisk_image
;
317 u64 ramdisk_size
= boot_params
.hdr
.ramdisk_size
;
318 u64 end_of_lowmem
= max_low_pfn_mapped
<< PAGE_SHIFT
;
320 unsigned long slop
, clen
, mapaddr
;
323 /* We need to move the initrd down into lowmem */
324 ramdisk_here
= find_e820_area(0, end_of_lowmem
, ramdisk_size
,
327 if (ramdisk_here
== -1ULL)
328 panic("Cannot find place for new RAMDISK of size %lld\n",
331 /* Note: this includes all the lowmem currently occupied by
332 the initrd, we rely on that fact to keep the data intact. */
333 reserve_early(ramdisk_here
, ramdisk_here
+ ramdisk_size
,
335 initrd_start
= ramdisk_here
+ PAGE_OFFSET
;
336 initrd_end
= initrd_start
+ ramdisk_size
;
337 printk(KERN_INFO
"Allocated new RAMDISK: %08llx - %08llx\n",
338 ramdisk_here
, ramdisk_here
+ ramdisk_size
);
340 q
= (char *)initrd_start
;
342 /* Copy any lowmem portion of the initrd */
343 if (ramdisk_image
< end_of_lowmem
) {
344 clen
= end_of_lowmem
- ramdisk_image
;
345 p
= (char *)__va(ramdisk_image
);
348 ramdisk_image
+= clen
;
349 ramdisk_size
-= clen
;
352 /* Copy the highmem portion of the initrd */
353 while (ramdisk_size
) {
354 slop
= ramdisk_image
& ~PAGE_MASK
;
356 if (clen
> MAX_MAP_CHUNK
-slop
)
357 clen
= MAX_MAP_CHUNK
-slop
;
358 mapaddr
= ramdisk_image
& PAGE_MASK
;
359 p
= early_memremap(mapaddr
, clen
+slop
);
360 memcpy(q
, p
+slop
, clen
);
361 early_iounmap(p
, clen
+slop
);
363 ramdisk_image
+= clen
;
364 ramdisk_size
-= clen
;
366 /* high pages is not converted by early_res_to_bootmem */
367 ramdisk_image
= boot_params
.hdr
.ramdisk_image
;
368 ramdisk_size
= boot_params
.hdr
.ramdisk_size
;
369 printk(KERN_INFO
"Move RAMDISK from %016llx - %016llx to"
370 " %08llx - %08llx\n",
371 ramdisk_image
, ramdisk_image
+ ramdisk_size
- 1,
372 ramdisk_here
, ramdisk_here
+ ramdisk_size
- 1);
375 static void __init
reserve_initrd(void)
377 u64 ramdisk_image
= boot_params
.hdr
.ramdisk_image
;
378 u64 ramdisk_size
= boot_params
.hdr
.ramdisk_size
;
379 u64 ramdisk_end
= ramdisk_image
+ ramdisk_size
;
380 u64 end_of_lowmem
= max_low_pfn_mapped
<< PAGE_SHIFT
;
382 if (!boot_params
.hdr
.type_of_loader
||
383 !ramdisk_image
|| !ramdisk_size
)
384 return; /* No initrd provided by bootloader */
388 if (ramdisk_size
>= (end_of_lowmem
>>1)) {
389 free_early(ramdisk_image
, ramdisk_end
);
390 printk(KERN_ERR
"initrd too large to handle, "
391 "disabling initrd\n");
395 printk(KERN_INFO
"RAMDISK: %08llx - %08llx\n", ramdisk_image
,
399 if (ramdisk_end
<= end_of_lowmem
) {
400 /* All in lowmem, easy case */
402 * don't need to reserve again, already reserved early
403 * in i386_start_kernel
405 initrd_start
= ramdisk_image
+ PAGE_OFFSET
;
406 initrd_end
= initrd_start
+ ramdisk_size
;
412 free_early(ramdisk_image
, ramdisk_end
);
415 static void __init
reserve_initrd(void)
418 #endif /* CONFIG_BLK_DEV_INITRD */
420 static void __init
parse_setup_data(void)
422 struct setup_data
*data
;
425 if (boot_params
.hdr
.version
< 0x0209)
427 pa_data
= boot_params
.hdr
.setup_data
;
429 data
= early_memremap(pa_data
, PAGE_SIZE
);
430 switch (data
->type
) {
432 parse_e820_ext(data
, pa_data
);
437 pa_data
= data
->next
;
438 early_iounmap(data
, PAGE_SIZE
);
442 static void __init
e820_reserve_setup_data(void)
444 struct setup_data
*data
;
448 if (boot_params
.hdr
.version
< 0x0209)
450 pa_data
= boot_params
.hdr
.setup_data
;
452 data
= early_memremap(pa_data
, sizeof(*data
));
453 e820_update_range(pa_data
, sizeof(*data
)+data
->len
,
454 E820_RAM
, E820_RESERVED_KERN
);
456 pa_data
= data
->next
;
457 early_iounmap(data
, sizeof(*data
));
462 sanitize_e820_map(e820
.map
, ARRAY_SIZE(e820
.map
), &e820
.nr_map
);
463 memcpy(&e820_saved
, &e820
, sizeof(struct e820map
));
464 printk(KERN_INFO
"extended physical RAM map:\n");
465 e820_print_map("reserve setup_data");
468 static void __init
reserve_early_setup_data(void)
470 struct setup_data
*data
;
474 if (boot_params
.hdr
.version
< 0x0209)
476 pa_data
= boot_params
.hdr
.setup_data
;
478 data
= early_memremap(pa_data
, sizeof(*data
));
479 sprintf(buf
, "setup data %x", data
->type
);
480 reserve_early(pa_data
, pa_data
+sizeof(*data
)+data
->len
, buf
);
481 pa_data
= data
->next
;
482 early_iounmap(data
, sizeof(*data
));
487 * --------- Crashkernel reservation ------------------------------
492 static inline unsigned long long get_total_mem(void)
494 unsigned long long total
;
496 total
= max_pfn
- min_low_pfn
;
498 return total
<< PAGE_SHIFT
;
501 static void __init
reserve_crashkernel(void)
503 unsigned long long total_mem
;
504 unsigned long long crash_size
, crash_base
;
507 total_mem
= get_total_mem();
509 ret
= parse_crashkernel(boot_command_line
, total_mem
,
510 &crash_size
, &crash_base
);
511 if (ret
!= 0 || crash_size
<= 0)
514 /* 0 means: find the address automatically */
515 if (crash_base
<= 0) {
516 const unsigned long long alignment
= 16<<20; /* 16M */
518 crash_base
= find_e820_area(alignment
, ULONG_MAX
, crash_size
,
520 if (crash_base
== -1ULL) {
521 pr_info("crashkernel reservation failed - No suitable area found.\n");
525 unsigned long long start
;
527 start
= find_e820_area(crash_base
, ULONG_MAX
, crash_size
,
529 if (start
!= crash_base
) {
530 pr_info("crashkernel reservation failed - memory is in use.\n");
534 reserve_early(crash_base
, crash_base
+ crash_size
, "CRASH KERNEL");
536 printk(KERN_INFO
"Reserving %ldMB of memory at %ldMB "
537 "for crashkernel (System RAM: %ldMB)\n",
538 (unsigned long)(crash_size
>> 20),
539 (unsigned long)(crash_base
>> 20),
540 (unsigned long)(total_mem
>> 20));
542 crashk_res
.start
= crash_base
;
543 crashk_res
.end
= crash_base
+ crash_size
- 1;
544 insert_resource(&iomem_resource
, &crashk_res
);
547 static void __init
reserve_crashkernel(void)
552 static struct resource standard_io_resources
[] = {
553 { .name
= "dma1", .start
= 0x00, .end
= 0x1f,
554 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
555 { .name
= "pic1", .start
= 0x20, .end
= 0x21,
556 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
557 { .name
= "timer0", .start
= 0x40, .end
= 0x43,
558 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
559 { .name
= "timer1", .start
= 0x50, .end
= 0x53,
560 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
561 { .name
= "keyboard", .start
= 0x60, .end
= 0x60,
562 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
563 { .name
= "keyboard", .start
= 0x64, .end
= 0x64,
564 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
565 { .name
= "dma page reg", .start
= 0x80, .end
= 0x8f,
566 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
567 { .name
= "pic2", .start
= 0xa0, .end
= 0xa1,
568 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
569 { .name
= "dma2", .start
= 0xc0, .end
= 0xdf,
570 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
571 { .name
= "fpu", .start
= 0xf0, .end
= 0xff,
572 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
}
575 void __init
reserve_standard_io_resources(void)
579 /* request I/O space for devices used on all i[345]86 PCs */
580 for (i
= 0; i
< ARRAY_SIZE(standard_io_resources
); i
++)
581 request_resource(&ioport_resource
, &standard_io_resources
[i
]);
586 * Note: elfcorehdr_addr is not just limited to vmcore. It is also used by
587 * is_kdump_kernel() to determine if we are booting after a panic. Hence
588 * ifdef it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE.
591 #ifdef CONFIG_CRASH_DUMP
592 /* elfcorehdr= specifies the location of elf core header
593 * stored by the crashed kernel. This option will be passed
594 * by kexec loader to the capture kernel.
596 static int __init
setup_elfcorehdr(char *arg
)
601 elfcorehdr_addr
= memparse(arg
, &end
);
602 return end
> arg
? 0 : -EINVAL
;
604 early_param("elfcorehdr", setup_elfcorehdr
);
607 #ifdef CONFIG_X86_RESERVE_LOW_64K
608 static int __init
dmi_low_memory_corruption(const struct dmi_system_id
*d
)
611 "%s detected: BIOS may corrupt low RAM, working around it.\n",
614 e820_update_range(0, 0x10000, E820_RAM
, E820_RESERVED
);
615 sanitize_e820_map(e820
.map
, ARRAY_SIZE(e820
.map
), &e820
.nr_map
);
621 /* List of systems that have known low memory corruption BIOS problems */
622 static struct dmi_system_id __initdata bad_bios_dmi_table
[] = {
623 #ifdef CONFIG_X86_RESERVE_LOW_64K
625 .callback
= dmi_low_memory_corruption
,
628 DMI_MATCH(DMI_BIOS_VENDOR
, "American Megatrends Inc."),
632 .callback
= dmi_low_memory_corruption
,
633 .ident
= "Phoenix BIOS",
635 DMI_MATCH(DMI_BIOS_VENDOR
, "Phoenix Technologies"),
639 .callback
= dmi_low_memory_corruption
,
640 .ident
= "Phoenix/MSC BIOS",
642 DMI_MATCH(DMI_BIOS_VENDOR
, "Phoenix/MSC"),
646 * AMI BIOS with low memory corruption was found on Intel DG45ID and
648 * It has a different DMI_BIOS_VENDOR = "Intel Corp.", for now we will
649 * match only DMI_BOARD_NAME and see if there is more bad products
653 .callback
= dmi_low_memory_corruption
,
656 DMI_MATCH(DMI_BOARD_NAME
, "DG45ID"),
660 .callback
= dmi_low_memory_corruption
,
663 DMI_MATCH(DMI_BOARD_NAME
, "DG45FC"),
670 static void __init
trim_bios_range(void)
673 * A special case is the first 4Kb of memory;
674 * This is a BIOS owned area, not kernel ram, but generally
675 * not listed as such in the E820 table.
677 e820_update_range(0, PAGE_SIZE
, E820_RAM
, E820_RESERVED
);
679 * special case: Some BIOSen report the PC BIOS
680 * area (640->1Mb) as ram even though it is not.
683 e820_remove_range(BIOS_BEGIN
, BIOS_END
- BIOS_BEGIN
, E820_RAM
, 1);
684 sanitize_e820_map(e820
.map
, ARRAY_SIZE(e820
.map
), &e820
.nr_map
);
688 * Determine if we were loaded by an EFI loader. If so, then we have also been
689 * passed the efi memmap, systab, etc., so we should use these data structures
690 * for initialization. Note, the efi init code path is determined by the
691 * global efi_enabled. This allows the same kernel image to be used on existing
692 * systems (with a traditional BIOS) as well as on EFI systems.
695 * setup_arch - architecture-specific boot-time initializations
697 * Note: On x86_64, fixmaps are ready for use even before this is called.
700 void __init
setup_arch(char **cmdline_p
)
706 memcpy(&boot_cpu_data
, &new_cpu_data
, sizeof(new_cpu_data
));
707 visws_early_detect();
709 printk(KERN_INFO
"Command line: %s\n", boot_command_line
);
712 /* VMI may relocate the fixmap; do this before touching ioremap area */
716 early_ioremap_init();
718 ROOT_DEV
= old_decode_dev(boot_params
.hdr
.root_dev
);
719 screen_info
= boot_params
.screen_info
;
720 edid_info
= boot_params
.edid_info
;
722 apm_info
.bios
= boot_params
.apm_bios_info
;
723 ist_info
= boot_params
.ist_info
;
724 if (boot_params
.sys_desc_table
.length
!= 0) {
725 set_mca_bus(boot_params
.sys_desc_table
.table
[3] & 0x2);
726 machine_id
= boot_params
.sys_desc_table
.table
[0];
727 machine_submodel_id
= boot_params
.sys_desc_table
.table
[1];
728 BIOS_revision
= boot_params
.sys_desc_table
.table
[2];
731 saved_video_mode
= boot_params
.hdr
.vid_mode
;
732 bootloader_type
= boot_params
.hdr
.type_of_loader
;
733 if ((bootloader_type
>> 4) == 0xe) {
734 bootloader_type
&= 0xf;
735 bootloader_type
|= (boot_params
.hdr
.ext_loader_type
+0x10) << 4;
737 bootloader_version
= bootloader_type
& 0xf;
738 bootloader_version
|= boot_params
.hdr
.ext_loader_ver
<< 4;
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);
746 if (!strncmp((char *)&boot_params
.efi_info
.efi_loader_signature
,
758 x86_init
.oem
.arch_setup();
762 /* update the e820_saved too */
763 e820_reserve_setup_data();
767 if (!boot_params
.hdr
.root_flags
)
768 root_mountflags
&= ~MS_RDONLY
;
769 init_mm
.start_code
= (unsigned long) _text
;
770 init_mm
.end_code
= (unsigned long) _etext
;
771 init_mm
.end_data
= (unsigned long) _edata
;
772 init_mm
.brk
= _brk_end
;
774 code_resource
.start
= virt_to_phys(_text
);
775 code_resource
.end
= virt_to_phys(_etext
)-1;
776 data_resource
.start
= virt_to_phys(_etext
);
777 data_resource
.end
= virt_to_phys(_edata
)-1;
778 bss_resource
.start
= virt_to_phys(&__bss_start
);
779 bss_resource
.end
= virt_to_phys(&__bss_stop
)-1;
781 #ifdef CONFIG_CMDLINE_BOOL
782 #ifdef CONFIG_CMDLINE_OVERRIDE
783 strlcpy(boot_command_line
, builtin_cmdline
, COMMAND_LINE_SIZE
);
785 if (builtin_cmdline
[0]) {
786 /* append boot loader cmdline to builtin */
787 strlcat(builtin_cmdline
, " ", COMMAND_LINE_SIZE
);
788 strlcat(builtin_cmdline
, boot_command_line
, COMMAND_LINE_SIZE
);
789 strlcpy(boot_command_line
, builtin_cmdline
, COMMAND_LINE_SIZE
);
794 strlcpy(command_line
, boot_command_line
, COMMAND_LINE_SIZE
);
795 *cmdline_p
= command_line
;
798 * x86_configure_nx() is called before parse_early_param() to detect
799 * whether hardware doesn't support NX (so that the early EHCI debug
800 * console setup can safely call set_fixmap()). It may then be called
801 * again from within noexec_setup() during parsing early parameters
802 * to honor the respective command line option.
810 /* Must be before kernel pagetables are setup */
813 /* after early param, so could get panic from serial */
814 reserve_early_setup_data();
816 if (acpi_mps_check()) {
817 #ifdef CONFIG_X86_LOCAL_APIC
820 setup_clear_cpu_cap(X86_FEATURE_APIC
);
824 if (pci_early_dump_regs
)
825 early_dump_pci_devices();
828 finish_e820_parsing();
835 dmi_check_system(bad_bios_dmi_table
);
838 * VMware detection requires dmi to be available, so this
839 * needs to be done after dmi_scan_machine, for the BP.
841 init_hypervisor_platform();
843 x86_init
.resources
.probe_roms();
845 /* after parse_early_param, so could debug it */
846 insert_resource(&iomem_resource
, &code_resource
);
847 insert_resource(&iomem_resource
, &data_resource
);
848 insert_resource(&iomem_resource
, &bss_resource
);
852 if (ppro_with_ram_bug()) {
853 e820_update_range(0x70000000ULL
, 0x40000ULL
, E820_RAM
,
855 sanitize_e820_map(e820
.map
, ARRAY_SIZE(e820
.map
), &e820
.nr_map
);
856 printk(KERN_INFO
"fixed physical RAM map:\n");
857 e820_print_map("bad_ppro");
860 early_gart_iommu_check();
864 * partially used pages are not usable - thus
865 * we are rounding upwards:
867 max_pfn
= e820_end_of_ram_pfn();
869 /* preallocate 4k for mptable mpc */
870 early_reserve_e820_mpc_new();
871 /* update e820 for memory not covered by WB MTRRs */
873 if (mtrr_trim_uncached_memory(max_pfn
))
874 max_pfn
= e820_end_of_ram_pfn();
877 /* max_low_pfn get updated here */
878 find_low_pfn_range();
880 num_physpages
= max_pfn
;
884 /* How many end-of-memory variables you have, grandma! */
885 /* need this before calling reserve_initrd */
886 if (max_pfn
> (1UL<<(32 - PAGE_SHIFT
)))
887 max_low_pfn
= e820_end_of_low_ram_pfn();
889 max_low_pfn
= max_pfn
;
891 high_memory
= (void *)__va(max_pfn
* PAGE_SIZE
- 1) + 1;
892 max_pfn_mapped
= KERNEL_IMAGE_SIZE
>> PAGE_SHIFT
;
895 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
896 setup_bios_corruption_check();
899 printk(KERN_DEBUG
"initial memory mapped : 0 - %08lx\n",
900 max_pfn_mapped
<<PAGE_SHIFT
);
905 * Find and reserve possible boot-time SMP configuration:
909 reserve_trampoline_memory();
911 #ifdef CONFIG_ACPI_SLEEP
913 * Reserve low memory region for sleep support.
914 * even before init_memory_mapping
916 acpi_reserve_wakeup_memory();
920 /* max_pfn_mapped is updated here */
921 max_low_pfn_mapped
= init_memory_mapping(0, max_low_pfn
<<PAGE_SHIFT
);
922 max_pfn_mapped
= max_low_pfn_mapped
;
925 if (max_pfn
> max_low_pfn
) {
926 max_pfn_mapped
= init_memory_mapping(1UL<<32,
927 max_pfn
<<PAGE_SHIFT
);
928 /* can we preseve max_low_pfn ?*/
929 max_low_pfn
= max_pfn
;
934 * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
937 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
938 if (init_ohci1394_dma_early
)
939 init_ohci1394_dma_on_all_controllers();
944 reserve_crashkernel();
951 * Parse the ACPI tables for possible boot-time SMP configuration.
953 acpi_boot_table_init();
955 early_acpi_boot_init();
957 #ifdef CONFIG_ACPI_NUMA
959 * Parse SRAT to discover nodes.
961 acpi
= acpi_numa_init();
964 #ifdef CONFIG_K8_NUMA
966 k8
= !k8_numa_init(0, max_pfn
);
969 initmem_init(0, max_pfn
, acpi
, k8
);
970 #ifndef CONFIG_NO_BOOTMEM
971 early_res_to_bootmem(0, max_low_pfn
<<PAGE_SHIFT
);
974 dma32_reserve_bootmem();
976 reserve_ibft_region();
978 #ifdef CONFIG_KVM_CLOCK
982 x86_init
.paging
.pagetable_setup_start(swapper_pg_dir
);
984 x86_init
.paging
.pagetable_setup_done(swapper_pg_dir
);
992 generic_apic_probe();
997 * Read APIC and some other early information from ACPI tables.
1004 * get boot-time SMP configuration:
1006 if (smp_found_config
)
1009 prefill_possible_map();
1011 #ifdef CONFIG_X86_64
1015 init_apic_mappings();
1016 ioapic_init_mappings();
1018 /* need to wait for io_apic is mapped */
1019 probe_nr_irqs_gsi();
1023 e820_reserve_resources();
1024 e820_mark_nosave_regions(max_low_pfn
);
1026 x86_init
.resources
.reserve_resources();
1031 #if defined(CONFIG_VGA_CONSOLE)
1032 if (!efi_enabled
|| (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY
))
1033 conswitchp
= &vga_con
;
1034 #elif defined(CONFIG_DUMMY_CONSOLE)
1035 conswitchp
= &dummy_con
;
1038 x86_init
.oem
.banner();
1043 #ifdef CONFIG_X86_32
1045 static struct resource video_ram_resource
= {
1046 .name
= "Video RAM area",
1049 .flags
= IORESOURCE_BUSY
| IORESOURCE_MEM
1052 void __init
i386_reserve_resources(void)
1054 request_resource(&iomem_resource
, &video_ram_resource
);
1055 reserve_standard_io_resources();
1058 #endif /* CONFIG_X86_32 */