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/memblock.h>
35 #include <linux/seq_file.h>
36 #include <linux/console.h>
37 #include <linux/mca.h>
38 #include <linux/root_dev.h>
39 #include <linux/highmem.h>
40 #include <linux/module.h>
41 #include <linux/efi.h>
42 #include <linux/init.h>
43 #include <linux/edd.h>
44 #include <linux/iscsi_ibft.h>
45 #include <linux/nodemask.h>
46 #include <linux/kexec.h>
47 #include <linux/dmi.h>
48 #include <linux/pfn.h>
49 #include <linux/pci.h>
50 #include <asm/pci-direct.h>
51 #include <linux/init_ohci1394_dma.h>
52 #include <linux/kvm_para.h>
54 #include <linux/errno.h>
55 #include <linux/kernel.h>
56 #include <linux/stddef.h>
57 #include <linux/unistd.h>
58 #include <linux/ptrace.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>
106 #include <asm/olpc_ofw.h>
108 #include <asm/percpu.h>
109 #include <asm/topology.h>
110 #include <asm/apicdef.h>
113 #include <asm/numa_64.h>
118 * end_pfn only includes RAM, while max_pfn_mapped includes all e820 entries.
119 * The direct mapping extends to max_pfn_mapped, so that we can directly access
120 * apertures, ACPI and other tables without having to play with fixmaps.
122 unsigned long max_low_pfn_mapped
;
123 unsigned long max_pfn_mapped
;
126 RESERVE_BRK(dmi_alloc
, 65536);
129 unsigned int boot_cpu_id __read_mostly
;
131 static __initdata
unsigned long _brk_start
= (unsigned long)__brk_base
;
132 unsigned long _brk_end
= (unsigned long)__brk_base
;
135 int default_cpu_present_to_apicid(int mps_cpu
)
137 return __default_cpu_present_to_apicid(mps_cpu
);
140 int default_check_phys_apicid_present(int phys_apicid
)
142 return __default_check_phys_apicid_present(phys_apicid
);
146 #ifndef CONFIG_DEBUG_BOOT_PARAMS
147 struct boot_params __initdata boot_params
;
149 struct boot_params boot_params
;
155 static struct resource data_resource
= {
156 .name
= "Kernel data",
159 .flags
= IORESOURCE_BUSY
| IORESOURCE_MEM
162 static struct resource code_resource
= {
163 .name
= "Kernel code",
166 .flags
= IORESOURCE_BUSY
| IORESOURCE_MEM
169 static struct resource bss_resource
= {
170 .name
= "Kernel bss",
173 .flags
= IORESOURCE_BUSY
| IORESOURCE_MEM
178 /* cpu data as detected by the assembly code in head.S */
179 struct cpuinfo_x86 new_cpu_data __cpuinitdata
= {0, 0, 0, 0, -1, 1, 0, 0, -1};
180 /* common cpu data for all cpus */
181 struct cpuinfo_x86 boot_cpu_data __read_mostly
= {0, 0, 0, 0, -1, 1, 0, 0, -1};
182 EXPORT_SYMBOL(boot_cpu_data
);
183 static void set_mca_bus(int x
)
190 unsigned int def_to_bigsmp
;
192 /* for MCA, but anyone else can use it if they want */
193 unsigned int machine_id
;
194 unsigned int machine_submodel_id
;
195 unsigned int BIOS_revision
;
197 struct apm_info apm_info
;
198 EXPORT_SYMBOL(apm_info
);
200 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
201 defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
202 struct ist_info ist_info
;
203 EXPORT_SYMBOL(ist_info
);
205 struct ist_info ist_info
;
209 struct cpuinfo_x86 boot_cpu_data __read_mostly
= {
210 .x86_phys_bits
= MAX_PHYSMEM_BITS
,
212 EXPORT_SYMBOL(boot_cpu_data
);
216 #if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64)
217 unsigned long mmu_cr4_features
;
219 unsigned long mmu_cr4_features
= X86_CR4_PAE
;
222 /* Boot loader ID and version as integers, for the benefit of proc_dointvec */
223 int bootloader_type
, bootloader_version
;
228 struct screen_info screen_info
;
229 EXPORT_SYMBOL(screen_info
);
230 struct edid_info edid_info
;
231 EXPORT_SYMBOL_GPL(edid_info
);
233 extern int root_mountflags
;
235 unsigned long saved_video_mode
;
237 #define RAMDISK_IMAGE_START_MASK 0x07FF
238 #define RAMDISK_PROMPT_FLAG 0x8000
239 #define RAMDISK_LOAD_FLAG 0x4000
241 static char __initdata command_line
[COMMAND_LINE_SIZE
];
242 #ifdef CONFIG_CMDLINE_BOOL
243 static char __initdata builtin_cmdline
[COMMAND_LINE_SIZE
] = CONFIG_CMDLINE
;
246 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
248 #ifdef CONFIG_EDD_MODULE
252 * copy_edd() - Copy the BIOS EDD information
253 * from boot_params into a safe place.
256 static inline void __init
copy_edd(void)
258 memcpy(edd
.mbr_signature
, boot_params
.edd_mbr_sig_buffer
,
259 sizeof(edd
.mbr_signature
));
260 memcpy(edd
.edd_info
, boot_params
.eddbuf
, sizeof(edd
.edd_info
));
261 edd
.mbr_signature_nr
= boot_params
.edd_mbr_sig_buf_entries
;
262 edd
.edd_info_nr
= boot_params
.eddbuf_entries
;
265 static inline void __init
copy_edd(void)
270 void * __init
extend_brk(size_t size
, size_t align
)
272 size_t mask
= align
- 1;
275 BUG_ON(_brk_start
== 0);
276 BUG_ON(align
& mask
);
278 _brk_end
= (_brk_end
+ mask
) & ~mask
;
279 BUG_ON((char *)(_brk_end
+ size
) > __brk_limit
);
281 ret
= (void *)_brk_end
;
284 memset(ret
, 0, size
);
290 static void __init
init_gbpages(void)
292 if (direct_gbpages
&& cpu_has_gbpages
)
293 printk(KERN_INFO
"Using GB pages for direct mapping\n");
298 static inline void init_gbpages(void)
303 static void __init
reserve_brk(void)
305 if (_brk_end
> _brk_start
)
306 memblock_x86_reserve_range(__pa(_brk_start
), __pa(_brk_end
), "BRK");
308 /* Mark brk area as locked down and no longer taking any
313 #ifdef CONFIG_BLK_DEV_INITRD
315 #define MAX_MAP_CHUNK (NR_FIX_BTMAPS << PAGE_SHIFT)
316 static void __init
relocate_initrd(void)
318 /* Assume only end is not page aligned */
319 u64 ramdisk_image
= boot_params
.hdr
.ramdisk_image
;
320 u64 ramdisk_size
= boot_params
.hdr
.ramdisk_size
;
321 u64 area_size
= PAGE_ALIGN(ramdisk_size
);
322 u64 end_of_lowmem
= max_low_pfn_mapped
<< PAGE_SHIFT
;
324 unsigned long slop
, clen
, mapaddr
;
327 /* We need to move the initrd down into lowmem */
328 ramdisk_here
= memblock_find_in_range(0, end_of_lowmem
, area_size
,
331 if (ramdisk_here
== MEMBLOCK_ERROR
)
332 panic("Cannot find place for new RAMDISK of size %lld\n",
335 /* Note: this includes all the lowmem currently occupied by
336 the initrd, we rely on that fact to keep the data intact. */
337 memblock_x86_reserve_range(ramdisk_here
, ramdisk_here
+ area_size
, "NEW RAMDISK");
338 initrd_start
= ramdisk_here
+ PAGE_OFFSET
;
339 initrd_end
= initrd_start
+ ramdisk_size
;
340 printk(KERN_INFO
"Allocated new RAMDISK: %08llx - %08llx\n",
341 ramdisk_here
, ramdisk_here
+ ramdisk_size
);
343 q
= (char *)initrd_start
;
345 /* Copy any lowmem portion of the initrd */
346 if (ramdisk_image
< end_of_lowmem
) {
347 clen
= end_of_lowmem
- ramdisk_image
;
348 p
= (char *)__va(ramdisk_image
);
351 ramdisk_image
+= clen
;
352 ramdisk_size
-= clen
;
355 /* Copy the highmem portion of the initrd */
356 while (ramdisk_size
) {
357 slop
= ramdisk_image
& ~PAGE_MASK
;
359 if (clen
> MAX_MAP_CHUNK
-slop
)
360 clen
= MAX_MAP_CHUNK
-slop
;
361 mapaddr
= ramdisk_image
& PAGE_MASK
;
362 p
= early_memremap(mapaddr
, clen
+slop
);
363 memcpy(q
, p
+slop
, clen
);
364 early_iounmap(p
, clen
+slop
);
366 ramdisk_image
+= clen
;
367 ramdisk_size
-= clen
;
369 /* high pages is not converted by early_res_to_bootmem */
370 ramdisk_image
= boot_params
.hdr
.ramdisk_image
;
371 ramdisk_size
= boot_params
.hdr
.ramdisk_size
;
372 printk(KERN_INFO
"Move RAMDISK from %016llx - %016llx to"
373 " %08llx - %08llx\n",
374 ramdisk_image
, ramdisk_image
+ ramdisk_size
- 1,
375 ramdisk_here
, ramdisk_here
+ ramdisk_size
- 1);
378 static void __init
reserve_initrd(void)
380 /* Assume only end is not page aligned */
381 u64 ramdisk_image
= boot_params
.hdr
.ramdisk_image
;
382 u64 ramdisk_size
= boot_params
.hdr
.ramdisk_size
;
383 u64 ramdisk_end
= PAGE_ALIGN(ramdisk_image
+ ramdisk_size
);
384 u64 end_of_lowmem
= max_low_pfn_mapped
<< PAGE_SHIFT
;
386 if (!boot_params
.hdr
.type_of_loader
||
387 !ramdisk_image
|| !ramdisk_size
)
388 return; /* No initrd provided by bootloader */
392 if (ramdisk_size
>= (end_of_lowmem
>>1)) {
393 memblock_x86_free_range(ramdisk_image
, ramdisk_end
);
394 printk(KERN_ERR
"initrd too large to handle, "
395 "disabling initrd\n");
399 printk(KERN_INFO
"RAMDISK: %08llx - %08llx\n", ramdisk_image
,
403 if (ramdisk_end
<= end_of_lowmem
) {
404 /* All in lowmem, easy case */
406 * don't need to reserve again, already reserved early
407 * in i386_start_kernel
409 initrd_start
= ramdisk_image
+ PAGE_OFFSET
;
410 initrd_end
= initrd_start
+ ramdisk_size
;
416 memblock_x86_free_range(ramdisk_image
, ramdisk_end
);
419 static void __init
reserve_initrd(void)
422 #endif /* CONFIG_BLK_DEV_INITRD */
424 static void __init
parse_setup_data(void)
426 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
, PAGE_SIZE
);
434 switch (data
->type
) {
436 parse_e820_ext(data
, pa_data
);
441 pa_data
= data
->next
;
442 early_iounmap(data
, PAGE_SIZE
);
446 static void __init
e820_reserve_setup_data(void)
448 struct setup_data
*data
;
452 if (boot_params
.hdr
.version
< 0x0209)
454 pa_data
= boot_params
.hdr
.setup_data
;
456 data
= early_memremap(pa_data
, sizeof(*data
));
457 e820_update_range(pa_data
, sizeof(*data
)+data
->len
,
458 E820_RAM
, E820_RESERVED_KERN
);
460 pa_data
= data
->next
;
461 early_iounmap(data
, sizeof(*data
));
466 sanitize_e820_map(e820
.map
, ARRAY_SIZE(e820
.map
), &e820
.nr_map
);
467 memcpy(&e820_saved
, &e820
, sizeof(struct e820map
));
468 printk(KERN_INFO
"extended physical RAM map:\n");
469 e820_print_map("reserve setup_data");
472 static void __init
memblock_x86_reserve_range_setup_data(void)
474 struct setup_data
*data
;
478 if (boot_params
.hdr
.version
< 0x0209)
480 pa_data
= boot_params
.hdr
.setup_data
;
482 data
= early_memremap(pa_data
, sizeof(*data
));
483 sprintf(buf
, "setup data %x", data
->type
);
484 memblock_x86_reserve_range(pa_data
, pa_data
+sizeof(*data
)+data
->len
, buf
);
485 pa_data
= data
->next
;
486 early_iounmap(data
, sizeof(*data
));
491 * --------- Crashkernel reservation ------------------------------
496 static inline unsigned long long get_total_mem(void)
498 unsigned long long total
;
500 total
= max_pfn
- min_low_pfn
;
502 return total
<< PAGE_SHIFT
;
505 #define DEFAULT_BZIMAGE_ADDR_MAX 0x37FFFFFF
506 static void __init
reserve_crashkernel(void)
508 unsigned long long total_mem
;
509 unsigned long long crash_size
, crash_base
;
512 total_mem
= get_total_mem();
514 ret
= parse_crashkernel(boot_command_line
, total_mem
,
515 &crash_size
, &crash_base
);
516 if (ret
!= 0 || crash_size
<= 0)
519 /* 0 means: find the address automatically */
520 if (crash_base
<= 0) {
521 const unsigned long long alignment
= 16<<20; /* 16M */
524 * kexec want bzImage is below DEFAULT_BZIMAGE_ADDR_MAX
526 crash_base
= memblock_find_in_range(alignment
,
527 DEFAULT_BZIMAGE_ADDR_MAX
, crash_size
, alignment
);
529 if (crash_base
== MEMBLOCK_ERROR
) {
530 pr_info("crashkernel reservation failed - No suitable area found.\n");
534 unsigned long long start
;
536 start
= memblock_find_in_range(crash_base
,
537 crash_base
+ crash_size
, crash_size
, 1<<20);
538 if (start
!= crash_base
) {
539 pr_info("crashkernel reservation failed - memory is in use.\n");
543 memblock_x86_reserve_range(crash_base
, crash_base
+ crash_size
, "CRASH KERNEL");
545 printk(KERN_INFO
"Reserving %ldMB of memory at %ldMB "
546 "for crashkernel (System RAM: %ldMB)\n",
547 (unsigned long)(crash_size
>> 20),
548 (unsigned long)(crash_base
>> 20),
549 (unsigned long)(total_mem
>> 20));
551 crashk_res
.start
= crash_base
;
552 crashk_res
.end
= crash_base
+ crash_size
- 1;
553 insert_resource(&iomem_resource
, &crashk_res
);
556 static void __init
reserve_crashkernel(void)
561 static struct resource standard_io_resources
[] = {
562 { .name
= "dma1", .start
= 0x00, .end
= 0x1f,
563 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
564 { .name
= "pic1", .start
= 0x20, .end
= 0x21,
565 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
566 { .name
= "timer0", .start
= 0x40, .end
= 0x43,
567 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
568 { .name
= "timer1", .start
= 0x50, .end
= 0x53,
569 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
570 { .name
= "keyboard", .start
= 0x60, .end
= 0x60,
571 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
572 { .name
= "keyboard", .start
= 0x64, .end
= 0x64,
573 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
574 { .name
= "dma page reg", .start
= 0x80, .end
= 0x8f,
575 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
576 { .name
= "pic2", .start
= 0xa0, .end
= 0xa1,
577 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
578 { .name
= "dma2", .start
= 0xc0, .end
= 0xdf,
579 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
580 { .name
= "fpu", .start
= 0xf0, .end
= 0xff,
581 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
}
584 void __init
reserve_standard_io_resources(void)
588 /* request I/O space for devices used on all i[345]86 PCs */
589 for (i
= 0; i
< ARRAY_SIZE(standard_io_resources
); i
++)
590 request_resource(&ioport_resource
, &standard_io_resources
[i
]);
595 * Note: elfcorehdr_addr is not just limited to vmcore. It is also used by
596 * is_kdump_kernel() to determine if we are booting after a panic. Hence
597 * ifdef it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE.
600 #ifdef CONFIG_CRASH_DUMP
601 /* elfcorehdr= specifies the location of elf core header
602 * stored by the crashed kernel. This option will be passed
603 * by kexec loader to the capture kernel.
605 static int __init
setup_elfcorehdr(char *arg
)
610 elfcorehdr_addr
= memparse(arg
, &end
);
611 return end
> arg
? 0 : -EINVAL
;
613 early_param("elfcorehdr", setup_elfcorehdr
);
616 static __init
void reserve_ibft_region(void)
618 unsigned long addr
, size
= 0;
620 addr
= find_ibft_region(&size
);
623 memblock_x86_reserve_range(addr
, addr
+ size
, "* ibft");
626 #ifdef CONFIG_X86_RESERVE_LOW_64K
627 static int __init
dmi_low_memory_corruption(const struct dmi_system_id
*d
)
630 "%s detected: BIOS may corrupt low RAM, working around it.\n",
633 e820_update_range(0, 0x10000, E820_RAM
, E820_RESERVED
);
634 sanitize_e820_map(e820
.map
, ARRAY_SIZE(e820
.map
), &e820
.nr_map
);
640 /* List of systems that have known low memory corruption BIOS problems */
641 static struct dmi_system_id __initdata bad_bios_dmi_table
[] = {
642 #ifdef CONFIG_X86_RESERVE_LOW_64K
644 .callback
= dmi_low_memory_corruption
,
647 DMI_MATCH(DMI_BIOS_VENDOR
, "American Megatrends Inc."),
651 .callback
= dmi_low_memory_corruption
,
652 .ident
= "Phoenix BIOS",
654 DMI_MATCH(DMI_BIOS_VENDOR
, "Phoenix Technologies"),
658 .callback
= dmi_low_memory_corruption
,
659 .ident
= "Phoenix/MSC BIOS",
661 DMI_MATCH(DMI_BIOS_VENDOR
, "Phoenix/MSC"),
665 * AMI BIOS with low memory corruption was found on Intel DG45ID and
667 * It has a different DMI_BIOS_VENDOR = "Intel Corp.", for now we will
668 * match only DMI_BOARD_NAME and see if there is more bad products
672 .callback
= dmi_low_memory_corruption
,
675 DMI_MATCH(DMI_BOARD_NAME
, "DG45ID"),
679 .callback
= dmi_low_memory_corruption
,
682 DMI_MATCH(DMI_BOARD_NAME
, "DG45FC"),
686 * The Dell Inspiron Mini 1012 has DMI_BIOS_VENDOR = "Dell Inc.", so
687 * match on the product name.
690 .callback
= dmi_low_memory_corruption
,
691 .ident
= "Phoenix BIOS",
693 DMI_MATCH(DMI_PRODUCT_NAME
, "Inspiron 1012"),
700 static void __init
trim_bios_range(void)
703 * A special case is the first 4Kb of memory;
704 * This is a BIOS owned area, not kernel ram, but generally
705 * not listed as such in the E820 table.
707 e820_update_range(0, PAGE_SIZE
, E820_RAM
, E820_RESERVED
);
709 * special case: Some BIOSen report the PC BIOS
710 * area (640->1Mb) as ram even though it is not.
713 e820_remove_range(BIOS_BEGIN
, BIOS_END
- BIOS_BEGIN
, E820_RAM
, 1);
714 sanitize_e820_map(e820
.map
, ARRAY_SIZE(e820
.map
), &e820
.nr_map
);
717 static u64 __init
get_max_mapped(void)
719 u64 end
= max_pfn_mapped
;
727 * Determine if we were loaded by an EFI loader. If so, then we have also been
728 * passed the efi memmap, systab, etc., so we should use these data structures
729 * for initialization. Note, the efi init code path is determined by the
730 * global efi_enabled. This allows the same kernel image to be used on existing
731 * systems (with a traditional BIOS) as well as on EFI systems.
734 * setup_arch - architecture-specific boot-time initializations
736 * Note: On x86_64, fixmaps are ready for use even before this is called.
739 void __init
setup_arch(char **cmdline_p
)
745 memcpy(&boot_cpu_data
, &new_cpu_data
, sizeof(new_cpu_data
));
746 visws_early_detect();
748 printk(KERN_INFO
"Command line: %s\n", boot_command_line
);
751 /* VMI may relocate the fixmap; do this before touching ioremap area */
754 /* OFW also may relocate the fixmap */
759 early_ioremap_init();
761 setup_olpc_ofw_pgd();
763 ROOT_DEV
= old_decode_dev(boot_params
.hdr
.root_dev
);
764 screen_info
= boot_params
.screen_info
;
765 edid_info
= boot_params
.edid_info
;
767 apm_info
.bios
= boot_params
.apm_bios_info
;
768 ist_info
= boot_params
.ist_info
;
769 if (boot_params
.sys_desc_table
.length
!= 0) {
770 set_mca_bus(boot_params
.sys_desc_table
.table
[3] & 0x2);
771 machine_id
= boot_params
.sys_desc_table
.table
[0];
772 machine_submodel_id
= boot_params
.sys_desc_table
.table
[1];
773 BIOS_revision
= boot_params
.sys_desc_table
.table
[2];
776 saved_video_mode
= boot_params
.hdr
.vid_mode
;
777 bootloader_type
= boot_params
.hdr
.type_of_loader
;
778 if ((bootloader_type
>> 4) == 0xe) {
779 bootloader_type
&= 0xf;
780 bootloader_type
|= (boot_params
.hdr
.ext_loader_type
+0x10) << 4;
782 bootloader_version
= bootloader_type
& 0xf;
783 bootloader_version
|= boot_params
.hdr
.ext_loader_ver
<< 4;
785 #ifdef CONFIG_BLK_DEV_RAM
786 rd_image_start
= boot_params
.hdr
.ram_size
& RAMDISK_IMAGE_START_MASK
;
787 rd_prompt
= ((boot_params
.hdr
.ram_size
& RAMDISK_PROMPT_FLAG
) != 0);
788 rd_doload
= ((boot_params
.hdr
.ram_size
& RAMDISK_LOAD_FLAG
) != 0);
791 if (!strncmp((char *)&boot_params
.efi_info
.efi_loader_signature
,
799 efi_memblock_x86_reserve_range();
803 x86_init
.oem
.arch_setup();
807 /* update the e820_saved too */
808 e820_reserve_setup_data();
812 if (!boot_params
.hdr
.root_flags
)
813 root_mountflags
&= ~MS_RDONLY
;
814 init_mm
.start_code
= (unsigned long) _text
;
815 init_mm
.end_code
= (unsigned long) _etext
;
816 init_mm
.end_data
= (unsigned long) _edata
;
817 init_mm
.brk
= _brk_end
;
819 code_resource
.start
= virt_to_phys(_text
);
820 code_resource
.end
= virt_to_phys(_etext
)-1;
821 data_resource
.start
= virt_to_phys(_etext
);
822 data_resource
.end
= virt_to_phys(_edata
)-1;
823 bss_resource
.start
= virt_to_phys(&__bss_start
);
824 bss_resource
.end
= virt_to_phys(&__bss_stop
)-1;
826 #ifdef CONFIG_CMDLINE_BOOL
827 #ifdef CONFIG_CMDLINE_OVERRIDE
828 strlcpy(boot_command_line
, builtin_cmdline
, COMMAND_LINE_SIZE
);
830 if (builtin_cmdline
[0]) {
831 /* append boot loader cmdline to builtin */
832 strlcat(builtin_cmdline
, " ", COMMAND_LINE_SIZE
);
833 strlcat(builtin_cmdline
, boot_command_line
, COMMAND_LINE_SIZE
);
834 strlcpy(boot_command_line
, builtin_cmdline
, COMMAND_LINE_SIZE
);
839 strlcpy(command_line
, boot_command_line
, COMMAND_LINE_SIZE
);
840 *cmdline_p
= command_line
;
843 * x86_configure_nx() is called before parse_early_param() to detect
844 * whether hardware doesn't support NX (so that the early EHCI debug
845 * console setup can safely call set_fixmap()). It may then be called
846 * again from within noexec_setup() during parsing early parameters
847 * to honor the respective command line option.
855 /* Must be before kernel pagetables are setup */
858 /* after early param, so could get panic from serial */
859 memblock_x86_reserve_range_setup_data();
861 if (acpi_mps_check()) {
862 #ifdef CONFIG_X86_LOCAL_APIC
865 setup_clear_cpu_cap(X86_FEATURE_APIC
);
869 if (pci_early_dump_regs
)
870 early_dump_pci_devices();
873 finish_e820_parsing();
880 dmi_check_system(bad_bios_dmi_table
);
883 * VMware detection requires dmi to be available, so this
884 * needs to be done after dmi_scan_machine, for the BP.
886 init_hypervisor_platform();
888 x86_init
.resources
.probe_roms();
890 /* after parse_early_param, so could debug it */
891 insert_resource(&iomem_resource
, &code_resource
);
892 insert_resource(&iomem_resource
, &data_resource
);
893 insert_resource(&iomem_resource
, &bss_resource
);
897 if (ppro_with_ram_bug()) {
898 e820_update_range(0x70000000ULL
, 0x40000ULL
, E820_RAM
,
900 sanitize_e820_map(e820
.map
, ARRAY_SIZE(e820
.map
), &e820
.nr_map
);
901 printk(KERN_INFO
"fixed physical RAM map:\n");
902 e820_print_map("bad_ppro");
905 early_gart_iommu_check();
909 * partially used pages are not usable - thus
910 * we are rounding upwards:
912 max_pfn
= e820_end_of_ram_pfn();
914 /* update e820 for memory not covered by WB MTRRs */
916 if (mtrr_trim_uncached_memory(max_pfn
))
917 max_pfn
= e820_end_of_ram_pfn();
920 /* max_low_pfn get updated here */
921 find_low_pfn_range();
923 num_physpages
= max_pfn
;
927 /* How many end-of-memory variables you have, grandma! */
928 /* need this before calling reserve_initrd */
929 if (max_pfn
> (1UL<<(32 - PAGE_SHIFT
)))
930 max_low_pfn
= e820_end_of_low_ram_pfn();
932 max_low_pfn
= max_pfn
;
934 high_memory
= (void *)__va(max_pfn
* PAGE_SIZE
- 1) + 1;
935 max_pfn_mapped
= KERNEL_IMAGE_SIZE
>> PAGE_SHIFT
;
939 * Find and reserve possible boot-time SMP configuration:
943 reserve_ibft_region();
946 * Need to conclude brk, before memblock_x86_fill()
947 * it could use memblock_find_in_range, could overlap with
952 memblock
.current_limit
= get_max_mapped();
955 /* preallocate 4k for mptable mpc */
956 early_reserve_e820_mpc_new();
958 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
959 setup_bios_corruption_check();
962 printk(KERN_DEBUG
"initial memory mapped : 0 - %08lx\n",
963 max_pfn_mapped
<<PAGE_SHIFT
);
965 reserve_trampoline_memory();
967 #ifdef CONFIG_ACPI_SLEEP
969 * Reserve low memory region for sleep support.
970 * even before init_memory_mapping
972 acpi_reserve_wakeup_memory();
976 /* max_pfn_mapped is updated here */
977 max_low_pfn_mapped
= init_memory_mapping(0, max_low_pfn
<<PAGE_SHIFT
);
978 max_pfn_mapped
= max_low_pfn_mapped
;
981 if (max_pfn
> max_low_pfn
) {
982 max_pfn_mapped
= init_memory_mapping(1UL<<32,
983 max_pfn
<<PAGE_SHIFT
);
984 /* can we preseve max_low_pfn ?*/
985 max_low_pfn
= max_pfn
;
988 memblock
.current_limit
= get_max_mapped();
991 * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
994 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
995 if (init_ohci1394_dma_early
)
996 init_ohci1394_dma_on_all_controllers();
1001 reserve_crashkernel();
1008 * Parse the ACPI tables for possible boot-time SMP configuration.
1010 acpi_boot_table_init();
1012 early_acpi_boot_init();
1014 #ifdef CONFIG_ACPI_NUMA
1016 * Parse SRAT to discover nodes.
1018 acpi
= acpi_numa_init();
1021 #ifdef CONFIG_K8_NUMA
1023 k8
= !k8_numa_init(0, max_pfn
);
1026 initmem_init(0, max_pfn
, acpi
, k8
);
1027 memblock_find_dma_reserve();
1028 dma32_reserve_bootmem();
1030 #ifdef CONFIG_KVM_CLOCK
1034 x86_init
.paging
.pagetable_setup_start(swapper_pg_dir
);
1036 x86_init
.paging
.pagetable_setup_done(swapper_pg_dir
);
1038 setup_trampoline_page_table();
1042 #ifdef CONFIG_X86_64
1046 generic_apic_probe();
1051 * Read APIC and some other early information from ACPI tables.
1058 * get boot-time SMP configuration:
1060 if (smp_found_config
)
1063 prefill_possible_map();
1065 #ifdef CONFIG_X86_64
1069 init_apic_mappings();
1070 ioapic_init_mappings();
1072 /* need to wait for io_apic is mapped */
1073 probe_nr_irqs_gsi();
1077 e820_reserve_resources();
1078 e820_mark_nosave_regions(max_low_pfn
);
1080 x86_init
.resources
.reserve_resources();
1085 #if defined(CONFIG_VGA_CONSOLE)
1086 if (!efi_enabled
|| (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY
))
1087 conswitchp
= &vga_con
;
1088 #elif defined(CONFIG_DUMMY_CONSOLE)
1089 conswitchp
= &dummy_con
;
1092 x86_init
.oem
.banner();
1097 #ifdef CONFIG_X86_32
1099 static struct resource video_ram_resource
= {
1100 .name
= "Video RAM area",
1103 .flags
= IORESOURCE_BUSY
| IORESOURCE_MEM
1106 void __init
i386_reserve_resources(void)
1108 request_resource(&iomem_resource
, &video_ram_resource
);
1109 reserve_standard_io_resources();
1112 #endif /* CONFIG_X86_32 */