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>
87 #include <asm/setup_arch.h>
88 #include <asm/bios_ebda.h>
89 #include <asm/cacheflush.h>
90 #include <asm/processor.h>
93 #include <asm/system.h>
94 #include <asm/vsyscall.h>
98 #include <asm/iommu.h>
100 #include <asm/mmu_context.h>
101 #include <asm/proto.h>
103 #include <asm/paravirt.h>
104 #include <asm/hypervisor.h>
105 #include <asm/olpc_ofw.h>
107 #include <asm/percpu.h>
108 #include <asm/topology.h>
109 #include <asm/apicdef.h>
110 #include <asm/amd_nb.h>
112 #include <asm/numa_64.h>
115 #include <asm/alternative.h>
116 #include <asm/prom.h>
119 * end_pfn only includes RAM, while max_pfn_mapped includes all e820 entries.
120 * The direct mapping extends to max_pfn_mapped, so that we can directly access
121 * apertures, ACPI and other tables without having to play with fixmaps.
123 unsigned long max_low_pfn_mapped
;
124 unsigned long max_pfn_mapped
;
127 RESERVE_BRK(dmi_alloc
, 65536);
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)
301 static void __init
cleanup_highmap(void)
306 static void __init
reserve_brk(void)
308 if (_brk_end
> _brk_start
)
309 memblock_x86_reserve_range(__pa(_brk_start
), __pa(_brk_end
), "BRK");
311 /* Mark brk area as locked down and no longer taking any
316 #ifdef CONFIG_BLK_DEV_INITRD
318 #define MAX_MAP_CHUNK (NR_FIX_BTMAPS << PAGE_SHIFT)
319 static void __init
relocate_initrd(void)
321 /* Assume only end is not page aligned */
322 u64 ramdisk_image
= boot_params
.hdr
.ramdisk_image
;
323 u64 ramdisk_size
= boot_params
.hdr
.ramdisk_size
;
324 u64 area_size
= PAGE_ALIGN(ramdisk_size
);
325 u64 end_of_lowmem
= max_low_pfn_mapped
<< PAGE_SHIFT
;
327 unsigned long slop
, clen
, mapaddr
;
330 /* We need to move the initrd down into lowmem */
331 ramdisk_here
= memblock_find_in_range(0, end_of_lowmem
, area_size
,
334 if (ramdisk_here
== MEMBLOCK_ERROR
)
335 panic("Cannot find place for new RAMDISK of size %lld\n",
338 /* Note: this includes all the lowmem currently occupied by
339 the initrd, we rely on that fact to keep the data intact. */
340 memblock_x86_reserve_range(ramdisk_here
, ramdisk_here
+ area_size
, "NEW RAMDISK");
341 initrd_start
= ramdisk_here
+ PAGE_OFFSET
;
342 initrd_end
= initrd_start
+ ramdisk_size
;
343 printk(KERN_INFO
"Allocated new RAMDISK: %08llx - %08llx\n",
344 ramdisk_here
, ramdisk_here
+ ramdisk_size
);
346 q
= (char *)initrd_start
;
348 /* Copy any lowmem portion of the initrd */
349 if (ramdisk_image
< end_of_lowmem
) {
350 clen
= end_of_lowmem
- ramdisk_image
;
351 p
= (char *)__va(ramdisk_image
);
354 ramdisk_image
+= clen
;
355 ramdisk_size
-= clen
;
358 /* Copy the highmem portion of the initrd */
359 while (ramdisk_size
) {
360 slop
= ramdisk_image
& ~PAGE_MASK
;
362 if (clen
> MAX_MAP_CHUNK
-slop
)
363 clen
= MAX_MAP_CHUNK
-slop
;
364 mapaddr
= ramdisk_image
& PAGE_MASK
;
365 p
= early_memremap(mapaddr
, clen
+slop
);
366 memcpy(q
, p
+slop
, clen
);
367 early_iounmap(p
, clen
+slop
);
369 ramdisk_image
+= clen
;
370 ramdisk_size
-= clen
;
372 /* high pages is not converted by early_res_to_bootmem */
373 ramdisk_image
= boot_params
.hdr
.ramdisk_image
;
374 ramdisk_size
= boot_params
.hdr
.ramdisk_size
;
375 printk(KERN_INFO
"Move RAMDISK from %016llx - %016llx to"
376 " %08llx - %08llx\n",
377 ramdisk_image
, ramdisk_image
+ ramdisk_size
- 1,
378 ramdisk_here
, ramdisk_here
+ ramdisk_size
- 1);
381 static void __init
reserve_initrd(void)
383 /* Assume only end is not page aligned */
384 u64 ramdisk_image
= boot_params
.hdr
.ramdisk_image
;
385 u64 ramdisk_size
= boot_params
.hdr
.ramdisk_size
;
386 u64 ramdisk_end
= PAGE_ALIGN(ramdisk_image
+ ramdisk_size
);
387 u64 end_of_lowmem
= max_low_pfn_mapped
<< PAGE_SHIFT
;
389 if (!boot_params
.hdr
.type_of_loader
||
390 !ramdisk_image
|| !ramdisk_size
)
391 return; /* No initrd provided by bootloader */
395 if (ramdisk_size
>= (end_of_lowmem
>>1)) {
396 memblock_x86_free_range(ramdisk_image
, ramdisk_end
);
397 printk(KERN_ERR
"initrd too large to handle, "
398 "disabling initrd\n");
402 printk(KERN_INFO
"RAMDISK: %08llx - %08llx\n", ramdisk_image
,
406 if (ramdisk_end
<= end_of_lowmem
) {
407 /* All in lowmem, easy case */
409 * don't need to reserve again, already reserved early
410 * in i386_start_kernel
412 initrd_start
= ramdisk_image
+ PAGE_OFFSET
;
413 initrd_end
= initrd_start
+ ramdisk_size
;
419 memblock_x86_free_range(ramdisk_image
, ramdisk_end
);
422 static void __init
reserve_initrd(void)
425 #endif /* CONFIG_BLK_DEV_INITRD */
427 static void __init
parse_setup_data(void)
429 struct setup_data
*data
;
432 if (boot_params
.hdr
.version
< 0x0209)
434 pa_data
= boot_params
.hdr
.setup_data
;
436 u32 data_len
, map_len
;
438 map_len
= max(PAGE_SIZE
- (pa_data
& ~PAGE_MASK
),
439 (u64
)sizeof(struct setup_data
));
440 data
= early_memremap(pa_data
, map_len
);
441 data_len
= data
->len
+ sizeof(struct setup_data
);
442 if (data_len
> map_len
) {
443 early_iounmap(data
, map_len
);
444 data
= early_memremap(pa_data
, data_len
);
448 switch (data
->type
) {
450 parse_e820_ext(data
);
458 pa_data
= data
->next
;
459 early_iounmap(data
, map_len
);
463 static void __init
e820_reserve_setup_data(void)
465 struct setup_data
*data
;
469 if (boot_params
.hdr
.version
< 0x0209)
471 pa_data
= boot_params
.hdr
.setup_data
;
473 data
= early_memremap(pa_data
, sizeof(*data
));
474 e820_update_range(pa_data
, sizeof(*data
)+data
->len
,
475 E820_RAM
, E820_RESERVED_KERN
);
477 pa_data
= data
->next
;
478 early_iounmap(data
, sizeof(*data
));
483 sanitize_e820_map(e820
.map
, ARRAY_SIZE(e820
.map
), &e820
.nr_map
);
484 memcpy(&e820_saved
, &e820
, sizeof(struct e820map
));
485 printk(KERN_INFO
"extended physical RAM map:\n");
486 e820_print_map("reserve setup_data");
489 static void __init
memblock_x86_reserve_range_setup_data(void)
491 struct setup_data
*data
;
495 if (boot_params
.hdr
.version
< 0x0209)
497 pa_data
= boot_params
.hdr
.setup_data
;
499 data
= early_memremap(pa_data
, sizeof(*data
));
500 sprintf(buf
, "setup data %x", data
->type
);
501 memblock_x86_reserve_range(pa_data
, pa_data
+sizeof(*data
)+data
->len
, buf
);
502 pa_data
= data
->next
;
503 early_iounmap(data
, sizeof(*data
));
508 * --------- Crashkernel reservation ------------------------------
513 static inline unsigned long long get_total_mem(void)
515 unsigned long long total
;
517 total
= max_pfn
- min_low_pfn
;
519 return total
<< PAGE_SHIFT
;
523 * Keep the crash kernel below this limit. On 32 bits earlier kernels
524 * would limit the kernel to the low 512 MiB due to mapping restrictions.
525 * On 64 bits, kexec-tools currently limits us to 896 MiB; increase this
526 * limit once kexec-tools are fixed.
529 # define CRASH_KERNEL_ADDR_MAX (512 << 20)
531 # define CRASH_KERNEL_ADDR_MAX (896 << 20)
534 static void __init
reserve_crashkernel(void)
536 unsigned long long total_mem
;
537 unsigned long long crash_size
, crash_base
;
540 total_mem
= get_total_mem();
542 ret
= parse_crashkernel(boot_command_line
, total_mem
,
543 &crash_size
, &crash_base
);
544 if (ret
!= 0 || crash_size
<= 0)
547 /* 0 means: find the address automatically */
548 if (crash_base
<= 0) {
549 const unsigned long long alignment
= 16<<20; /* 16M */
552 * kexec want bzImage is below CRASH_KERNEL_ADDR_MAX
554 crash_base
= memblock_find_in_range(alignment
,
555 CRASH_KERNEL_ADDR_MAX
, crash_size
, alignment
);
557 if (crash_base
== MEMBLOCK_ERROR
) {
558 pr_info("crashkernel reservation failed - No suitable area found.\n");
562 unsigned long long start
;
564 start
= memblock_find_in_range(crash_base
,
565 crash_base
+ crash_size
, crash_size
, 1<<20);
566 if (start
!= crash_base
) {
567 pr_info("crashkernel reservation failed - memory is in use.\n");
571 memblock_x86_reserve_range(crash_base
, crash_base
+ crash_size
, "CRASH KERNEL");
573 printk(KERN_INFO
"Reserving %ldMB of memory at %ldMB "
574 "for crashkernel (System RAM: %ldMB)\n",
575 (unsigned long)(crash_size
>> 20),
576 (unsigned long)(crash_base
>> 20),
577 (unsigned long)(total_mem
>> 20));
579 crashk_res
.start
= crash_base
;
580 crashk_res
.end
= crash_base
+ crash_size
- 1;
581 insert_resource(&iomem_resource
, &crashk_res
);
584 static void __init
reserve_crashkernel(void)
589 static struct resource standard_io_resources
[] = {
590 { .name
= "dma1", .start
= 0x00, .end
= 0x1f,
591 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
592 { .name
= "pic1", .start
= 0x20, .end
= 0x21,
593 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
594 { .name
= "timer0", .start
= 0x40, .end
= 0x43,
595 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
596 { .name
= "timer1", .start
= 0x50, .end
= 0x53,
597 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
598 { .name
= "keyboard", .start
= 0x60, .end
= 0x60,
599 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
600 { .name
= "keyboard", .start
= 0x64, .end
= 0x64,
601 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
602 { .name
= "dma page reg", .start
= 0x80, .end
= 0x8f,
603 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
604 { .name
= "pic2", .start
= 0xa0, .end
= 0xa1,
605 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
606 { .name
= "dma2", .start
= 0xc0, .end
= 0xdf,
607 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
608 { .name
= "fpu", .start
= 0xf0, .end
= 0xff,
609 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
}
612 void __init
reserve_standard_io_resources(void)
616 /* request I/O space for devices used on all i[345]86 PCs */
617 for (i
= 0; i
< ARRAY_SIZE(standard_io_resources
); i
++)
618 request_resource(&ioport_resource
, &standard_io_resources
[i
]);
623 * Note: elfcorehdr_addr is not just limited to vmcore. It is also used by
624 * is_kdump_kernel() to determine if we are booting after a panic. Hence
625 * ifdef it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE.
628 #ifdef CONFIG_CRASH_DUMP
629 /* elfcorehdr= specifies the location of elf core header
630 * stored by the crashed kernel. This option will be passed
631 * by kexec loader to the capture kernel.
633 static int __init
setup_elfcorehdr(char *arg
)
638 elfcorehdr_addr
= memparse(arg
, &end
);
639 return end
> arg
? 0 : -EINVAL
;
641 early_param("elfcorehdr", setup_elfcorehdr
);
644 static __init
void reserve_ibft_region(void)
646 unsigned long addr
, size
= 0;
648 addr
= find_ibft_region(&size
);
651 memblock_x86_reserve_range(addr
, addr
+ size
, "* ibft");
654 static unsigned reserve_low
= CONFIG_X86_RESERVE_LOW
<< 10;
656 static void __init
trim_bios_range(void)
659 * A special case is the first 4Kb of memory;
660 * This is a BIOS owned area, not kernel ram, but generally
661 * not listed as such in the E820 table.
663 * This typically reserves additional memory (64KiB by default)
664 * since some BIOSes are known to corrupt low memory. See the
665 * Kconfig help text for X86_RESERVE_LOW.
667 e820_update_range(0, ALIGN(reserve_low
, PAGE_SIZE
),
668 E820_RAM
, E820_RESERVED
);
671 * special case: Some BIOSen report the PC BIOS
672 * area (640->1Mb) as ram even though it is not.
675 e820_remove_range(BIOS_BEGIN
, BIOS_END
- BIOS_BEGIN
, E820_RAM
, 1);
676 sanitize_e820_map(e820
.map
, ARRAY_SIZE(e820
.map
), &e820
.nr_map
);
679 static int __init
parse_reservelow(char *p
)
681 unsigned long long size
;
686 size
= memparse(p
, &p
);
699 early_param("reservelow", parse_reservelow
);
702 * Determine if we were loaded by an EFI loader. If so, then we have also been
703 * passed the efi memmap, systab, etc., so we should use these data structures
704 * for initialization. Note, the efi init code path is determined by the
705 * global efi_enabled. This allows the same kernel image to be used on existing
706 * systems (with a traditional BIOS) as well as on EFI systems.
709 * setup_arch - architecture-specific boot-time initializations
711 * Note: On x86_64, fixmaps are ready for use even before this is called.
714 void __init
setup_arch(char **cmdline_p
)
719 memcpy(&boot_cpu_data
, &new_cpu_data
, sizeof(new_cpu_data
));
720 visws_early_detect();
723 * copy kernel address range established so far and switch
724 * to the proper swapper page table
726 clone_pgd_range(swapper_pg_dir
+ KERNEL_PGD_BOUNDARY
,
727 initial_page_table
+ KERNEL_PGD_BOUNDARY
,
730 load_cr3(swapper_pg_dir
);
733 printk(KERN_INFO
"Command line: %s\n", boot_command_line
);
737 * If we have OLPC OFW, we might end up relocating the fixmap due to
738 * reserve_top(), so do this before touching the ioremap area.
744 early_ioremap_init();
746 setup_olpc_ofw_pgd();
748 ROOT_DEV
= old_decode_dev(boot_params
.hdr
.root_dev
);
749 screen_info
= boot_params
.screen_info
;
750 edid_info
= boot_params
.edid_info
;
752 apm_info
.bios
= boot_params
.apm_bios_info
;
753 ist_info
= boot_params
.ist_info
;
754 if (boot_params
.sys_desc_table
.length
!= 0) {
755 set_mca_bus(boot_params
.sys_desc_table
.table
[3] & 0x2);
756 machine_id
= boot_params
.sys_desc_table
.table
[0];
757 machine_submodel_id
= boot_params
.sys_desc_table
.table
[1];
758 BIOS_revision
= boot_params
.sys_desc_table
.table
[2];
761 saved_video_mode
= boot_params
.hdr
.vid_mode
;
762 bootloader_type
= boot_params
.hdr
.type_of_loader
;
763 if ((bootloader_type
>> 4) == 0xe) {
764 bootloader_type
&= 0xf;
765 bootloader_type
|= (boot_params
.hdr
.ext_loader_type
+0x10) << 4;
767 bootloader_version
= bootloader_type
& 0xf;
768 bootloader_version
|= boot_params
.hdr
.ext_loader_ver
<< 4;
770 #ifdef CONFIG_BLK_DEV_RAM
771 rd_image_start
= boot_params
.hdr
.ram_size
& RAMDISK_IMAGE_START_MASK
;
772 rd_prompt
= ((boot_params
.hdr
.ram_size
& RAMDISK_PROMPT_FLAG
) != 0);
773 rd_doload
= ((boot_params
.hdr
.ram_size
& RAMDISK_LOAD_FLAG
) != 0);
776 if (!strncmp((char *)&boot_params
.efi_info
.efi_loader_signature
,
784 efi_memblock_x86_reserve_range();
788 x86_init
.oem
.arch_setup();
790 iomem_resource
.end
= (1ULL << boot_cpu_data
.x86_phys_bits
) - 1;
793 /* update the e820_saved too */
794 e820_reserve_setup_data();
798 if (!boot_params
.hdr
.root_flags
)
799 root_mountflags
&= ~MS_RDONLY
;
800 init_mm
.start_code
= (unsigned long) _text
;
801 init_mm
.end_code
= (unsigned long) _etext
;
802 init_mm
.end_data
= (unsigned long) _edata
;
803 init_mm
.brk
= _brk_end
;
805 code_resource
.start
= virt_to_phys(_text
);
806 code_resource
.end
= virt_to_phys(_etext
)-1;
807 data_resource
.start
= virt_to_phys(_etext
);
808 data_resource
.end
= virt_to_phys(_edata
)-1;
809 bss_resource
.start
= virt_to_phys(&__bss_start
);
810 bss_resource
.end
= virt_to_phys(&__bss_stop
)-1;
812 #ifdef CONFIG_CMDLINE_BOOL
813 #ifdef CONFIG_CMDLINE_OVERRIDE
814 strlcpy(boot_command_line
, builtin_cmdline
, COMMAND_LINE_SIZE
);
816 if (builtin_cmdline
[0]) {
817 /* append boot loader cmdline to builtin */
818 strlcat(builtin_cmdline
, " ", COMMAND_LINE_SIZE
);
819 strlcat(builtin_cmdline
, boot_command_line
, COMMAND_LINE_SIZE
);
820 strlcpy(boot_command_line
, builtin_cmdline
, COMMAND_LINE_SIZE
);
825 strlcpy(command_line
, boot_command_line
, COMMAND_LINE_SIZE
);
826 *cmdline_p
= command_line
;
829 * x86_configure_nx() is called before parse_early_param() to detect
830 * whether hardware doesn't support NX (so that the early EHCI debug
831 * console setup can safely call set_fixmap()). It may then be called
832 * again from within noexec_setup() during parsing early parameters
833 * to honor the respective command line option.
841 /* after early param, so could get panic from serial */
842 memblock_x86_reserve_range_setup_data();
844 if (acpi_mps_check()) {
845 #ifdef CONFIG_X86_LOCAL_APIC
848 setup_clear_cpu_cap(X86_FEATURE_APIC
);
852 if (pci_early_dump_regs
)
853 early_dump_pci_devices();
856 finish_e820_parsing();
864 * VMware detection requires dmi to be available, so this
865 * needs to be done after dmi_scan_machine, for the BP.
867 init_hypervisor_platform();
869 x86_init
.resources
.probe_roms();
871 /* after parse_early_param, so could debug it */
872 insert_resource(&iomem_resource
, &code_resource
);
873 insert_resource(&iomem_resource
, &data_resource
);
874 insert_resource(&iomem_resource
, &bss_resource
);
878 if (ppro_with_ram_bug()) {
879 e820_update_range(0x70000000ULL
, 0x40000ULL
, E820_RAM
,
881 sanitize_e820_map(e820
.map
, ARRAY_SIZE(e820
.map
), &e820
.nr_map
);
882 printk(KERN_INFO
"fixed physical RAM map:\n");
883 e820_print_map("bad_ppro");
886 early_gart_iommu_check();
890 * partially used pages are not usable - thus
891 * we are rounding upwards:
893 max_pfn
= e820_end_of_ram_pfn();
895 /* update e820 for memory not covered by WB MTRRs */
897 if (mtrr_trim_uncached_memory(max_pfn
))
898 max_pfn
= e820_end_of_ram_pfn();
901 /* max_low_pfn get updated here */
902 find_low_pfn_range();
904 num_physpages
= max_pfn
;
908 /* How many end-of-memory variables you have, grandma! */
909 /* need this before calling reserve_initrd */
910 if (max_pfn
> (1UL<<(32 - PAGE_SHIFT
)))
911 max_low_pfn
= e820_end_of_low_ram_pfn();
913 max_low_pfn
= max_pfn
;
915 high_memory
= (void *)__va(max_pfn
* PAGE_SIZE
- 1) + 1;
919 * Find and reserve possible boot-time SMP configuration:
923 reserve_ibft_region();
926 * Need to conclude brk, before memblock_x86_fill()
927 * it could use memblock_find_in_range, could overlap with
934 memblock
.current_limit
= get_max_mapped();
937 /* preallocate 4k for mptable mpc */
938 early_reserve_e820_mpc_new();
940 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
941 setup_bios_corruption_check();
944 printk(KERN_DEBUG
"initial memory mapped : 0 - %08lx\n",
945 max_pfn_mapped
<<PAGE_SHIFT
);
951 /* max_pfn_mapped is updated here */
952 max_low_pfn_mapped
= init_memory_mapping(0, max_low_pfn
<<PAGE_SHIFT
);
953 max_pfn_mapped
= max_low_pfn_mapped
;
956 if (max_pfn
> max_low_pfn
) {
957 max_pfn_mapped
= init_memory_mapping(1UL<<32,
958 max_pfn
<<PAGE_SHIFT
);
959 /* can we preseve max_low_pfn ?*/
960 max_low_pfn
= max_pfn
;
963 memblock
.current_limit
= get_max_mapped();
966 * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
969 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
970 if (init_ohci1394_dma_early
)
971 init_ohci1394_dma_on_all_controllers();
976 reserve_crashkernel();
983 * Parse the ACPI tables for possible boot-time SMP configuration.
985 acpi_boot_table_init();
987 early_acpi_boot_init();
990 memblock_find_dma_reserve();
991 dma32_reserve_bootmem();
993 #ifdef CONFIG_KVM_CLOCK
997 x86_init
.paging
.pagetable_setup_start(swapper_pg_dir
);
999 x86_init
.paging
.pagetable_setup_done(swapper_pg_dir
);
1001 #ifdef CONFIG_X86_32
1002 /* sync back kernel address range */
1003 clone_pgd_range(initial_page_table
+ KERNEL_PGD_BOUNDARY
,
1004 swapper_pg_dir
+ KERNEL_PGD_BOUNDARY
,
1010 #ifdef CONFIG_X86_64
1014 generic_apic_probe();
1019 * Read APIC and some other early information from ACPI tables.
1026 * get boot-time SMP configuration:
1028 if (smp_found_config
)
1031 prefill_possible_map();
1035 init_apic_mappings();
1036 ioapic_and_gsi_init();
1040 e820_reserve_resources();
1041 e820_mark_nosave_regions(max_low_pfn
);
1043 x86_init
.resources
.reserve_resources();
1048 #if defined(CONFIG_VGA_CONSOLE)
1049 if (!efi_enabled
|| (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY
))
1050 conswitchp
= &vga_con
;
1051 #elif defined(CONFIG_DUMMY_CONSOLE)
1052 conswitchp
= &dummy_con
;
1055 x86_init
.oem
.banner();
1057 x86_init
.timers
.wallclock_init();
1061 local_irq_save(flags
);
1062 arch_init_ideal_nop5();
1063 local_irq_restore(flags
);
1066 #ifdef CONFIG_X86_32
1068 static struct resource video_ram_resource
= {
1069 .name
= "Video RAM area",
1072 .flags
= IORESOURCE_BUSY
| IORESOURCE_MEM
1075 void __init
i386_reserve_resources(void)
1077 request_resource(&iomem_resource
, &video_ram_resource
);
1078 reserve_standard_io_resources();
1081 #endif /* CONFIG_X86_32 */