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/root_dev.h>
38 #include <linux/highmem.h>
39 #include <linux/export.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>
52 #include <linux/dma-contiguous.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>
71 #include <linux/jiffies.h>
72 #include <linux/mem_encrypt.h>
74 #include <linux/usb/xhci-dbgp.h>
75 #include <video/edid.h>
79 #include <asm/realmode.h>
80 #include <asm/e820/api.h>
81 #include <asm/mpspec.h>
82 #include <asm/setup.h>
84 #include <asm/timer.h>
85 #include <asm/i8259.h>
86 #include <asm/sections.h>
87 #include <asm/io_apic.h>
89 #include <asm/setup_arch.h>
90 #include <asm/bios_ebda.h>
91 #include <asm/cacheflush.h>
92 #include <asm/processor.h>
94 #include <asm/kasan.h>
96 #include <asm/vsyscall.h>
100 #include <asm/iommu.h>
101 #include <asm/gart.h>
102 #include <asm/mmu_context.h>
103 #include <asm/proto.h>
105 #include <asm/paravirt.h>
106 #include <asm/hypervisor.h>
107 #include <asm/olpc_ofw.h>
109 #include <asm/percpu.h>
110 #include <asm/topology.h>
111 #include <asm/apicdef.h>
112 #include <asm/amd_nb.h>
114 #include <asm/alternative.h>
115 #include <asm/prom.h>
116 #include <asm/microcode.h>
117 #include <asm/mmu_context.h>
118 #include <asm/kaslr.h>
119 #include <asm/unwind.h>
122 * max_low_pfn_mapped: highest direct mapped pfn under 4GB
123 * max_pfn_mapped: highest direct mapped pfn over 4GB
125 * The direct mapping only covers E820_TYPE_RAM regions, so the ranges and gaps are
126 * represented by pfn_mapped
128 unsigned long max_low_pfn_mapped
;
129 unsigned long max_pfn_mapped
;
132 RESERVE_BRK(dmi_alloc
, 65536);
136 static __initdata
unsigned long _brk_start
= (unsigned long)__brk_base
;
137 unsigned long _brk_end
= (unsigned long)__brk_base
;
139 struct boot_params boot_params
;
144 static struct resource data_resource
= {
145 .name
= "Kernel data",
148 .flags
= IORESOURCE_BUSY
| IORESOURCE_SYSTEM_RAM
151 static struct resource code_resource
= {
152 .name
= "Kernel code",
155 .flags
= IORESOURCE_BUSY
| IORESOURCE_SYSTEM_RAM
158 static struct resource bss_resource
= {
159 .name
= "Kernel bss",
162 .flags
= IORESOURCE_BUSY
| IORESOURCE_SYSTEM_RAM
167 /* cpu data as detected by the assembly code in head_32.S */
168 struct cpuinfo_x86 new_cpu_data
;
170 /* common cpu data for all cpus */
171 struct cpuinfo_x86 boot_cpu_data __read_mostly
;
172 EXPORT_SYMBOL(boot_cpu_data
);
174 unsigned int def_to_bigsmp
;
176 /* for MCA, but anyone else can use it if they want */
177 unsigned int machine_id
;
178 unsigned int machine_submodel_id
;
179 unsigned int BIOS_revision
;
181 struct apm_info apm_info
;
182 EXPORT_SYMBOL(apm_info
);
184 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
185 defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
186 struct ist_info ist_info
;
187 EXPORT_SYMBOL(ist_info
);
189 struct ist_info ist_info
;
193 struct cpuinfo_x86 boot_cpu_data __read_mostly
= {
194 .x86_phys_bits
= MAX_PHYSMEM_BITS
,
196 EXPORT_SYMBOL(boot_cpu_data
);
200 #if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64)
201 __visible
unsigned long mmu_cr4_features __ro_after_init
;
203 __visible
unsigned long mmu_cr4_features __ro_after_init
= X86_CR4_PAE
;
206 /* Boot loader ID and version as integers, for the benefit of proc_dointvec */
207 int bootloader_type
, bootloader_version
;
212 struct screen_info screen_info
;
213 EXPORT_SYMBOL(screen_info
);
214 struct edid_info edid_info
;
215 EXPORT_SYMBOL_GPL(edid_info
);
217 extern int root_mountflags
;
219 unsigned long saved_video_mode
;
221 #define RAMDISK_IMAGE_START_MASK 0x07FF
222 #define RAMDISK_PROMPT_FLAG 0x8000
223 #define RAMDISK_LOAD_FLAG 0x4000
225 static char __initdata command_line
[COMMAND_LINE_SIZE
];
226 #ifdef CONFIG_CMDLINE_BOOL
227 static char __initdata builtin_cmdline
[COMMAND_LINE_SIZE
] = CONFIG_CMDLINE
;
230 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
232 #ifdef CONFIG_EDD_MODULE
236 * copy_edd() - Copy the BIOS EDD information
237 * from boot_params into a safe place.
240 static inline void __init
copy_edd(void)
242 memcpy(edd
.mbr_signature
, boot_params
.edd_mbr_sig_buffer
,
243 sizeof(edd
.mbr_signature
));
244 memcpy(edd
.edd_info
, boot_params
.eddbuf
, sizeof(edd
.edd_info
));
245 edd
.mbr_signature_nr
= boot_params
.edd_mbr_sig_buf_entries
;
246 edd
.edd_info_nr
= boot_params
.eddbuf_entries
;
249 static inline void __init
copy_edd(void)
254 void * __init
extend_brk(size_t size
, size_t align
)
256 size_t mask
= align
- 1;
259 BUG_ON(_brk_start
== 0);
260 BUG_ON(align
& mask
);
262 _brk_end
= (_brk_end
+ mask
) & ~mask
;
263 BUG_ON((char *)(_brk_end
+ size
) > __brk_limit
);
265 ret
= (void *)_brk_end
;
268 memset(ret
, 0, size
);
274 static void __init
cleanup_highmap(void)
279 static void __init
reserve_brk(void)
281 if (_brk_end
> _brk_start
)
282 memblock_reserve(__pa_symbol(_brk_start
),
283 _brk_end
- _brk_start
);
285 /* Mark brk area as locked down and no longer taking any
290 u64 relocated_ramdisk
;
292 #ifdef CONFIG_BLK_DEV_INITRD
294 static u64 __init
get_ramdisk_image(void)
296 u64 ramdisk_image
= boot_params
.hdr
.ramdisk_image
;
298 ramdisk_image
|= (u64
)boot_params
.ext_ramdisk_image
<< 32;
300 return ramdisk_image
;
302 static u64 __init
get_ramdisk_size(void)
304 u64 ramdisk_size
= boot_params
.hdr
.ramdisk_size
;
306 ramdisk_size
|= (u64
)boot_params
.ext_ramdisk_size
<< 32;
311 static void __init
relocate_initrd(void)
313 /* Assume only end is not page aligned */
314 u64 ramdisk_image
= get_ramdisk_image();
315 u64 ramdisk_size
= get_ramdisk_size();
316 u64 area_size
= PAGE_ALIGN(ramdisk_size
);
318 /* We need to move the initrd down into directly mapped mem */
319 relocated_ramdisk
= memblock_find_in_range(0, PFN_PHYS(max_pfn_mapped
),
320 area_size
, PAGE_SIZE
);
322 if (!relocated_ramdisk
)
323 panic("Cannot find place for new RAMDISK of size %lld\n",
326 /* Note: this includes all the mem currently occupied by
327 the initrd, we rely on that fact to keep the data intact. */
328 memblock_reserve(relocated_ramdisk
, area_size
);
329 initrd_start
= relocated_ramdisk
+ PAGE_OFFSET
;
330 initrd_end
= initrd_start
+ ramdisk_size
;
331 printk(KERN_INFO
"Allocated new RAMDISK: [mem %#010llx-%#010llx]\n",
332 relocated_ramdisk
, relocated_ramdisk
+ ramdisk_size
- 1);
334 copy_from_early_mem((void *)initrd_start
, ramdisk_image
, ramdisk_size
);
336 printk(KERN_INFO
"Move RAMDISK from [mem %#010llx-%#010llx] to"
337 " [mem %#010llx-%#010llx]\n",
338 ramdisk_image
, ramdisk_image
+ ramdisk_size
- 1,
339 relocated_ramdisk
, relocated_ramdisk
+ ramdisk_size
- 1);
342 static void __init
early_reserve_initrd(void)
344 /* Assume only end is not page aligned */
345 u64 ramdisk_image
= get_ramdisk_image();
346 u64 ramdisk_size
= get_ramdisk_size();
347 u64 ramdisk_end
= PAGE_ALIGN(ramdisk_image
+ ramdisk_size
);
349 if (!boot_params
.hdr
.type_of_loader
||
350 !ramdisk_image
|| !ramdisk_size
)
351 return; /* No initrd provided by bootloader */
353 memblock_reserve(ramdisk_image
, ramdisk_end
- ramdisk_image
);
355 static void __init
reserve_initrd(void)
357 /* Assume only end is not page aligned */
358 u64 ramdisk_image
= get_ramdisk_image();
359 u64 ramdisk_size
= get_ramdisk_size();
360 u64 ramdisk_end
= PAGE_ALIGN(ramdisk_image
+ ramdisk_size
);
363 if (!boot_params
.hdr
.type_of_loader
||
364 !ramdisk_image
|| !ramdisk_size
)
365 return; /* No initrd provided by bootloader */
368 * If SME is active, this memory will be marked encrypted by the
369 * kernel when it is accessed (including relocation). However, the
370 * ramdisk image was loaded decrypted by the bootloader, so make
371 * sure that it is encrypted before accessing it. For SEV the
372 * ramdisk will already be encrypted, so only do this for SME.
375 sme_early_encrypt(ramdisk_image
, ramdisk_end
- ramdisk_image
);
379 mapped_size
= memblock_mem_size(max_pfn_mapped
);
380 if (ramdisk_size
>= (mapped_size
>>1))
381 panic("initrd too large to handle, "
382 "disabling initrd (%lld needed, %lld available)\n",
383 ramdisk_size
, mapped_size
>>1);
385 printk(KERN_INFO
"RAMDISK: [mem %#010llx-%#010llx]\n", ramdisk_image
,
388 if (pfn_range_is_mapped(PFN_DOWN(ramdisk_image
),
389 PFN_DOWN(ramdisk_end
))) {
390 /* All are mapped, easy case */
391 initrd_start
= ramdisk_image
+ PAGE_OFFSET
;
392 initrd_end
= initrd_start
+ ramdisk_size
;
398 memblock_free(ramdisk_image
, ramdisk_end
- ramdisk_image
);
402 static void __init
early_reserve_initrd(void)
405 static void __init
reserve_initrd(void)
408 #endif /* CONFIG_BLK_DEV_INITRD */
410 static void __init
parse_setup_data(void)
412 struct setup_data
*data
;
413 u64 pa_data
, pa_next
;
415 pa_data
= boot_params
.hdr
.setup_data
;
417 u32 data_len
, data_type
;
419 data
= early_memremap(pa_data
, sizeof(*data
));
420 data_len
= data
->len
+ sizeof(struct setup_data
);
421 data_type
= data
->type
;
422 pa_next
= data
->next
;
423 early_memunmap(data
, sizeof(*data
));
427 e820__memory_setup_extended(pa_data
, data_len
);
433 parse_efi_setup(pa_data
, data_len
);
442 static void __init
memblock_x86_reserve_range_setup_data(void)
444 struct setup_data
*data
;
447 pa_data
= boot_params
.hdr
.setup_data
;
449 data
= early_memremap(pa_data
, sizeof(*data
));
450 memblock_reserve(pa_data
, sizeof(*data
) + data
->len
);
451 pa_data
= data
->next
;
452 early_memunmap(data
, sizeof(*data
));
457 * --------- Crashkernel reservation ------------------------------
460 #ifdef CONFIG_KEXEC_CORE
462 /* 16M alignment for crash kernel regions */
463 #define CRASH_ALIGN (16 << 20)
466 * Keep the crash kernel below this limit. On 32 bits earlier kernels
467 * would limit the kernel to the low 512 MiB due to mapping restrictions.
468 * On 64bit, old kexec-tools need to under 896MiB.
471 # define CRASH_ADDR_LOW_MAX (512 << 20)
472 # define CRASH_ADDR_HIGH_MAX (512 << 20)
474 # define CRASH_ADDR_LOW_MAX (896UL << 20)
475 # define CRASH_ADDR_HIGH_MAX MAXMEM
478 static int __init
reserve_crashkernel_low(void)
481 unsigned long long base
, low_base
= 0, low_size
= 0;
482 unsigned long total_low_mem
;
485 total_low_mem
= memblock_mem_size(1UL << (32 - PAGE_SHIFT
));
487 /* crashkernel=Y,low */
488 ret
= parse_crashkernel_low(boot_command_line
, total_low_mem
, &low_size
, &base
);
491 * two parts from lib/swiotlb.c:
492 * -swiotlb size: user-specified with swiotlb= or default.
494 * -swiotlb overflow buffer: now hardcoded to 32k. We round it
495 * to 8M for other buffers that may need to stay low too. Also
496 * make sure we allocate enough extra low memory so that we
497 * don't run out of DMA buffers for 32-bit devices.
499 low_size
= max(swiotlb_size_or_default() + (8UL << 20), 256UL << 20);
501 /* passed with crashkernel=0,low ? */
506 low_base
= memblock_find_in_range(0, 1ULL << 32, low_size
, CRASH_ALIGN
);
508 pr_err("Cannot reserve %ldMB crashkernel low memory, please try smaller size.\n",
509 (unsigned long)(low_size
>> 20));
513 ret
= memblock_reserve(low_base
, low_size
);
515 pr_err("%s: Error reserving crashkernel low memblock.\n", __func__
);
519 pr_info("Reserving %ldMB of low memory at %ldMB for crashkernel (System low RAM: %ldMB)\n",
520 (unsigned long)(low_size
>> 20),
521 (unsigned long)(low_base
>> 20),
522 (unsigned long)(total_low_mem
>> 20));
524 crashk_low_res
.start
= low_base
;
525 crashk_low_res
.end
= low_base
+ low_size
- 1;
526 insert_resource(&iomem_resource
, &crashk_low_res
);
531 static void __init
reserve_crashkernel(void)
533 unsigned long long crash_size
, crash_base
, total_mem
;
537 total_mem
= memblock_phys_mem_size();
540 ret
= parse_crashkernel(boot_command_line
, total_mem
, &crash_size
, &crash_base
);
541 if (ret
!= 0 || crash_size
<= 0) {
542 /* crashkernel=X,high */
543 ret
= parse_crashkernel_high(boot_command_line
, total_mem
,
544 &crash_size
, &crash_base
);
545 if (ret
!= 0 || crash_size
<= 0)
550 /* 0 means: find the address automatically */
551 if (crash_base
<= 0) {
553 * Set CRASH_ADDR_LOW_MAX upper bound for crash memory,
554 * as old kexec-tools loads bzImage below that, unless
555 * "crashkernel=size[KMG],high" is specified.
557 crash_base
= memblock_find_in_range(CRASH_ALIGN
,
558 high
? CRASH_ADDR_HIGH_MAX
559 : CRASH_ADDR_LOW_MAX
,
560 crash_size
, CRASH_ALIGN
);
562 pr_info("crashkernel reservation failed - No suitable area found.\n");
567 unsigned long long start
;
569 start
= memblock_find_in_range(crash_base
,
570 crash_base
+ crash_size
,
571 crash_size
, 1 << 20);
572 if (start
!= crash_base
) {
573 pr_info("crashkernel reservation failed - memory is in use.\n");
577 ret
= memblock_reserve(crash_base
, crash_size
);
579 pr_err("%s: Error reserving crashkernel memblock.\n", __func__
);
583 if (crash_base
>= (1ULL << 32) && reserve_crashkernel_low()) {
584 memblock_free(crash_base
, crash_size
);
588 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel (System RAM: %ldMB)\n",
589 (unsigned long)(crash_size
>> 20),
590 (unsigned long)(crash_base
>> 20),
591 (unsigned long)(total_mem
>> 20));
593 crashk_res
.start
= crash_base
;
594 crashk_res
.end
= crash_base
+ crash_size
- 1;
595 insert_resource(&iomem_resource
, &crashk_res
);
598 static void __init
reserve_crashkernel(void)
603 static struct resource standard_io_resources
[] = {
604 { .name
= "dma1", .start
= 0x00, .end
= 0x1f,
605 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
606 { .name
= "pic1", .start
= 0x20, .end
= 0x21,
607 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
608 { .name
= "timer0", .start
= 0x40, .end
= 0x43,
609 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
610 { .name
= "timer1", .start
= 0x50, .end
= 0x53,
611 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
612 { .name
= "keyboard", .start
= 0x60, .end
= 0x60,
613 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
614 { .name
= "keyboard", .start
= 0x64, .end
= 0x64,
615 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
616 { .name
= "dma page reg", .start
= 0x80, .end
= 0x8f,
617 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
618 { .name
= "pic2", .start
= 0xa0, .end
= 0xa1,
619 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
620 { .name
= "dma2", .start
= 0xc0, .end
= 0xdf,
621 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
},
622 { .name
= "fpu", .start
= 0xf0, .end
= 0xff,
623 .flags
= IORESOURCE_BUSY
| IORESOURCE_IO
}
626 void __init
reserve_standard_io_resources(void)
630 /* request I/O space for devices used on all i[345]86 PCs */
631 for (i
= 0; i
< ARRAY_SIZE(standard_io_resources
); i
++)
632 request_resource(&ioport_resource
, &standard_io_resources
[i
]);
636 static __init
void reserve_ibft_region(void)
638 unsigned long addr
, size
= 0;
640 addr
= find_ibft_region(&size
);
643 memblock_reserve(addr
, size
);
646 static bool __init
snb_gfx_workaround_needed(void)
651 static const __initconst u16 snb_ids
[] = {
661 /* Assume no if something weird is going on with PCI */
662 if (!early_pci_allowed())
665 vendor
= read_pci_config_16(0, 2, 0, PCI_VENDOR_ID
);
666 if (vendor
!= 0x8086)
669 devid
= read_pci_config_16(0, 2, 0, PCI_DEVICE_ID
);
670 for (i
= 0; i
< ARRAY_SIZE(snb_ids
); i
++)
671 if (devid
== snb_ids
[i
])
679 * Sandy Bridge graphics has trouble with certain ranges, exclude
680 * them from allocation.
682 static void __init
trim_snb_memory(void)
684 static const __initconst
unsigned long bad_pages
[] = {
693 if (!snb_gfx_workaround_needed())
696 printk(KERN_DEBUG
"reserving inaccessible SNB gfx pages\n");
699 * Reserve all memory below the 1 MB mark that has not
700 * already been reserved.
702 memblock_reserve(0, 1<<20);
704 for (i
= 0; i
< ARRAY_SIZE(bad_pages
); i
++) {
705 if (memblock_reserve(bad_pages
[i
], PAGE_SIZE
))
706 printk(KERN_WARNING
"failed to reserve 0x%08lx\n",
712 * Here we put platform-specific memory range workarounds, i.e.
713 * memory known to be corrupt or otherwise in need to be reserved on
714 * specific platforms.
716 * If this gets used more widely it could use a real dispatch mechanism.
718 static void __init
trim_platform_memory_ranges(void)
723 static void __init
trim_bios_range(void)
726 * A special case is the first 4Kb of memory;
727 * This is a BIOS owned area, not kernel ram, but generally
728 * not listed as such in the E820 table.
730 * This typically reserves additional memory (64KiB by default)
731 * since some BIOSes are known to corrupt low memory. See the
732 * Kconfig help text for X86_RESERVE_LOW.
734 e820__range_update(0, PAGE_SIZE
, E820_TYPE_RAM
, E820_TYPE_RESERVED
);
737 * special case: Some BIOSen report the PC BIOS
738 * area (640->1Mb) as ram even though it is not.
741 e820__range_remove(BIOS_BEGIN
, BIOS_END
- BIOS_BEGIN
, E820_TYPE_RAM
, 1);
743 e820__update_table(e820_table
);
746 /* called before trim_bios_range() to spare extra sanitize */
747 static void __init
e820_add_kernel_range(void)
749 u64 start
= __pa_symbol(_text
);
750 u64 size
= __pa_symbol(_end
) - start
;
753 * Complain if .text .data and .bss are not marked as E820_TYPE_RAM and
754 * attempt to fix it by adding the range. We may have a confused BIOS,
755 * or the user may have used memmap=exactmap or memmap=xxM$yyM to
756 * exclude kernel range. If we really are running on top non-RAM,
757 * we will crash later anyways.
759 if (e820__mapped_all(start
, start
+ size
, E820_TYPE_RAM
))
762 pr_warn(".text .data .bss are not marked as E820_TYPE_RAM!\n");
763 e820__range_remove(start
, size
, E820_TYPE_RAM
, 0);
764 e820__range_add(start
, size
, E820_TYPE_RAM
);
767 static unsigned reserve_low
= CONFIG_X86_RESERVE_LOW
<< 10;
769 static int __init
parse_reservelow(char *p
)
771 unsigned long long size
;
776 size
= memparse(p
, &p
);
789 early_param("reservelow", parse_reservelow
);
791 static void __init
trim_low_memory_range(void)
793 memblock_reserve(0, ALIGN(reserve_low
, PAGE_SIZE
));
797 * Dump out kernel offset information on panic.
800 dump_kernel_offset(struct notifier_block
*self
, unsigned long v
, void *p
)
802 if (kaslr_enabled()) {
803 pr_emerg("Kernel Offset: 0x%lx from 0x%lx (relocation range: 0x%lx-0x%lx)\n",
809 pr_emerg("Kernel Offset: disabled\n");
816 * Determine if we were loaded by an EFI loader. If so, then we have also been
817 * passed the efi memmap, systab, etc., so we should use these data structures
818 * for initialization. Note, the efi init code path is determined by the
819 * global efi_enabled. This allows the same kernel image to be used on existing
820 * systems (with a traditional BIOS) as well as on EFI systems.
823 * setup_arch - architecture-specific boot-time initializations
825 * Note: On x86_64, fixmaps are ready for use even before this is called.
828 void __init
setup_arch(char **cmdline_p
)
830 memblock_reserve(__pa_symbol(_text
),
831 (unsigned long)__bss_stop
- (unsigned long)_text
);
833 early_reserve_initrd();
836 * At this point everything still needed from the boot loader
837 * or BIOS or kernel text should be early reserved or marked not
838 * RAM in e820. All other memory is free game.
842 memcpy(&boot_cpu_data
, &new_cpu_data
, sizeof(new_cpu_data
));
845 * copy kernel address range established so far and switch
846 * to the proper swapper page table
848 clone_pgd_range(swapper_pg_dir
+ KERNEL_PGD_BOUNDARY
,
849 initial_page_table
+ KERNEL_PGD_BOUNDARY
,
852 load_cr3(swapper_pg_dir
);
854 * Note: Quark X1000 CPUs advertise PGE incorrectly and require
855 * a cr3 based tlb flush, so the following __flush_tlb_all()
856 * will not flush anything because the cpu quirk which clears
857 * X86_FEATURE_PGE has not been invoked yet. Though due to the
858 * load_cr3() above the TLB has been flushed already. The
859 * quirk is invoked before subsequent calls to __flush_tlb_all()
860 * so proper operation is guaranteed.
864 printk(KERN_INFO
"Command line: %s\n", boot_command_line
);
868 * If we have OLPC OFW, we might end up relocating the fixmap due to
869 * reserve_top(), so do this before touching the ioremap area.
873 idt_setup_early_traps();
875 early_ioremap_init();
877 setup_olpc_ofw_pgd();
879 ROOT_DEV
= old_decode_dev(boot_params
.hdr
.root_dev
);
880 screen_info
= boot_params
.screen_info
;
881 edid_info
= boot_params
.edid_info
;
883 apm_info
.bios
= boot_params
.apm_bios_info
;
884 ist_info
= boot_params
.ist_info
;
886 saved_video_mode
= boot_params
.hdr
.vid_mode
;
887 bootloader_type
= boot_params
.hdr
.type_of_loader
;
888 if ((bootloader_type
>> 4) == 0xe) {
889 bootloader_type
&= 0xf;
890 bootloader_type
|= (boot_params
.hdr
.ext_loader_type
+0x10) << 4;
892 bootloader_version
= bootloader_type
& 0xf;
893 bootloader_version
|= boot_params
.hdr
.ext_loader_ver
<< 4;
895 #ifdef CONFIG_BLK_DEV_RAM
896 rd_image_start
= boot_params
.hdr
.ram_size
& RAMDISK_IMAGE_START_MASK
;
897 rd_prompt
= ((boot_params
.hdr
.ram_size
& RAMDISK_PROMPT_FLAG
) != 0);
898 rd_doload
= ((boot_params
.hdr
.ram_size
& RAMDISK_LOAD_FLAG
) != 0);
901 if (!strncmp((char *)&boot_params
.efi_info
.efi_loader_signature
,
902 EFI32_LOADER_SIGNATURE
, 4)) {
903 set_bit(EFI_BOOT
, &efi
.flags
);
904 } else if (!strncmp((char *)&boot_params
.efi_info
.efi_loader_signature
,
905 EFI64_LOADER_SIGNATURE
, 4)) {
906 set_bit(EFI_BOOT
, &efi
.flags
);
907 set_bit(EFI_64BIT
, &efi
.flags
);
910 if (efi_enabled(EFI_BOOT
))
911 efi_memblock_x86_reserve_range();
914 x86_init
.oem
.arch_setup();
916 iomem_resource
.end
= (1ULL << boot_cpu_data
.x86_phys_bits
) - 1;
917 e820__memory_setup();
922 if (!boot_params
.hdr
.root_flags
)
923 root_mountflags
&= ~MS_RDONLY
;
924 init_mm
.start_code
= (unsigned long) _text
;
925 init_mm
.end_code
= (unsigned long) _etext
;
926 init_mm
.end_data
= (unsigned long) _edata
;
927 init_mm
.brk
= _brk_end
;
929 mpx_mm_init(&init_mm
);
931 code_resource
.start
= __pa_symbol(_text
);
932 code_resource
.end
= __pa_symbol(_etext
)-1;
933 data_resource
.start
= __pa_symbol(_etext
);
934 data_resource
.end
= __pa_symbol(_edata
)-1;
935 bss_resource
.start
= __pa_symbol(__bss_start
);
936 bss_resource
.end
= __pa_symbol(__bss_stop
)-1;
938 #ifdef CONFIG_CMDLINE_BOOL
939 #ifdef CONFIG_CMDLINE_OVERRIDE
940 strlcpy(boot_command_line
, builtin_cmdline
, COMMAND_LINE_SIZE
);
942 if (builtin_cmdline
[0]) {
943 /* append boot loader cmdline to builtin */
944 strlcat(builtin_cmdline
, " ", COMMAND_LINE_SIZE
);
945 strlcat(builtin_cmdline
, boot_command_line
, COMMAND_LINE_SIZE
);
946 strlcpy(boot_command_line
, builtin_cmdline
, COMMAND_LINE_SIZE
);
951 strlcpy(command_line
, boot_command_line
, COMMAND_LINE_SIZE
);
952 *cmdline_p
= command_line
;
955 * x86_configure_nx() is called before parse_early_param() to detect
956 * whether hardware doesn't support NX (so that the early EHCI debug
957 * console setup can safely call set_fixmap()). It may then be called
958 * again from within noexec_setup() during parsing early parameters
959 * to honor the respective command line option.
965 #ifdef CONFIG_MEMORY_HOTPLUG
967 * Memory used by the kernel cannot be hot-removed because Linux
968 * cannot migrate the kernel pages. When memory hotplug is
969 * enabled, we should prevent memblock from allocating memory
972 * ACPI SRAT records all hotpluggable memory ranges. But before
973 * SRAT is parsed, we don't know about it.
975 * The kernel image is loaded into memory at very early time. We
976 * cannot prevent this anyway. So on NUMA system, we set any
977 * node the kernel resides in as un-hotpluggable.
979 * Since on modern servers, one node could have double-digit
980 * gigabytes memory, we can assume the memory around the kernel
981 * image is also un-hotpluggable. So before SRAT is parsed, just
982 * allocate memory near the kernel image to try the best to keep
983 * the kernel away from hotpluggable memory.
985 if (movable_node_is_enabled())
986 memblock_set_bottom_up(true);
991 /* after early param, so could get panic from serial */
992 memblock_x86_reserve_range_setup_data();
994 if (acpi_mps_check()) {
995 #ifdef CONFIG_X86_LOCAL_APIC
998 setup_clear_cpu_cap(X86_FEATURE_APIC
);
1002 if (pci_early_dump_regs
)
1003 early_dump_pci_devices();
1006 e820__reserve_setup_data();
1007 e820__finish_early_params();
1009 if (efi_enabled(EFI_BOOT
))
1014 dmi_set_dump_stack_arch_desc();
1017 * VMware detection requires dmi to be available, so this
1018 * needs to be done after dmi_scan_machine(), for the boot CPU.
1020 init_hypervisor_platform();
1022 x86_init
.resources
.probe_roms();
1024 /* after parse_early_param, so could debug it */
1025 insert_resource(&iomem_resource
, &code_resource
);
1026 insert_resource(&iomem_resource
, &data_resource
);
1027 insert_resource(&iomem_resource
, &bss_resource
);
1029 e820_add_kernel_range();
1031 #ifdef CONFIG_X86_32
1032 if (ppro_with_ram_bug()) {
1033 e820__range_update(0x70000000ULL
, 0x40000ULL
, E820_TYPE_RAM
,
1034 E820_TYPE_RESERVED
);
1035 e820__update_table(e820_table
);
1036 printk(KERN_INFO
"fixed physical RAM map:\n");
1037 e820__print_table("bad_ppro");
1040 early_gart_iommu_check();
1044 * partially used pages are not usable - thus
1045 * we are rounding upwards:
1047 max_pfn
= e820__end_of_ram_pfn();
1049 /* update e820 for memory not covered by WB MTRRs */
1051 if (mtrr_trim_uncached_memory(max_pfn
))
1052 max_pfn
= e820__end_of_ram_pfn();
1054 max_possible_pfn
= max_pfn
;
1057 * This call is required when the CPU does not support PAT. If
1058 * mtrr_bp_init() invoked it already via pat_init() the call has no
1064 * Define random base addresses for memory sections after max_pfn is
1065 * defined and before each memory section base is used.
1067 kernel_randomize_memory();
1069 #ifdef CONFIG_X86_32
1070 /* max_low_pfn get updated here */
1071 find_low_pfn_range();
1075 /* How many end-of-memory variables you have, grandma! */
1076 /* need this before calling reserve_initrd */
1077 if (max_pfn
> (1UL<<(32 - PAGE_SHIFT
)))
1078 max_low_pfn
= e820__end_of_low_ram_pfn();
1080 max_low_pfn
= max_pfn
;
1082 high_memory
= (void *)__va(max_pfn
* PAGE_SIZE
- 1) + 1;
1086 * Find and reserve possible boot-time SMP configuration:
1090 reserve_ibft_region();
1092 early_alloc_pgt_buf();
1095 * Need to conclude brk, before e820__memblock_setup()
1096 * it could use memblock_find_in_range, could overlap with
1103 memblock_set_current_limit(ISA_END_ADDRESS
);
1104 e820__memblock_setup();
1106 reserve_bios_regions();
1108 if (efi_enabled(EFI_MEMMAP
)) {
1114 * The EFI specification says that boot service code won't be
1115 * called after ExitBootServices(). This is, in fact, a lie.
1117 efi_reserve_boot_services();
1120 /* preallocate 4k for mptable mpc */
1121 e820__memblock_alloc_reserved_mpc_new();
1123 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
1124 setup_bios_corruption_check();
1127 #ifdef CONFIG_X86_32
1128 printk(KERN_DEBUG
"initial memory mapped: [mem 0x00000000-%#010lx]\n",
1129 (max_pfn_mapped
<<PAGE_SHIFT
) - 1);
1132 reserve_real_mode();
1134 trim_platform_memory_ranges();
1135 trim_low_memory_range();
1139 idt_setup_early_pf();
1142 * Update mmu_cr4_features (and, indirectly, trampoline_cr4_features)
1143 * with the current CR4 value. This may not be necessary, but
1144 * auditing all the early-boot CR4 manipulation would be needed to
1147 * Mask off features that don't work outside long mode (just
1150 mmu_cr4_features
= __read_cr4() & ~X86_CR4_PCIDE
;
1152 memblock_set_current_limit(get_max_mapped());
1155 * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
1158 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
1159 if (init_ohci1394_dma_early
)
1160 init_ohci1394_dma_on_all_controllers();
1162 /* Allocate bigger log buffer */
1165 if (efi_enabled(EFI_BOOT
)) {
1166 switch (boot_params
.secure_boot
) {
1167 case efi_secureboot_mode_disabled
:
1168 pr_info("Secure boot disabled\n");
1170 case efi_secureboot_mode_enabled
:
1171 pr_info("Secure boot enabled\n");
1174 pr_info("Secure boot could not be determined\n");
1181 acpi_table_upgrade();
1187 early_platform_quirks();
1190 * Parse the ACPI tables for possible boot-time SMP configuration.
1192 acpi_boot_table_init();
1194 early_acpi_boot_init();
1197 dma_contiguous_reserve(max_pfn_mapped
<< PAGE_SHIFT
);
1200 * Reserve memory for crash kernel after SRAT is parsed so that it
1201 * won't consume hotpluggable memory.
1203 reserve_crashkernel();
1205 memblock_find_dma_reserve();
1207 #ifdef CONFIG_KVM_GUEST
1211 tsc_early_delay_calibrate();
1212 if (!early_xdbc_setup_hardware())
1213 early_xdbc_register_console();
1215 x86_init
.paging
.pagetable_init();
1219 #ifdef CONFIG_X86_32
1220 /* sync back kernel address range */
1221 clone_pgd_range(initial_page_table
+ KERNEL_PGD_BOUNDARY
,
1222 swapper_pg_dir
+ KERNEL_PGD_BOUNDARY
,
1226 * sync back low identity map too. It is used for example
1227 * in the 32-bit EFI stub.
1229 clone_pgd_range(initial_page_table
,
1230 swapper_pg_dir
+ KERNEL_PGD_BOUNDARY
,
1231 min(KERNEL_PGD_PTRS
, KERNEL_PGD_BOUNDARY
));
1238 generic_apic_probe();
1243 * Read APIC and some other early information from ACPI tables.
1250 * get boot-time SMP configuration:
1255 * Systems w/o ACPI and mptables might not have it mapped the local
1256 * APIC yet, but prefill_possible_map() might need to access it.
1258 init_apic_mappings();
1260 prefill_possible_map();
1264 io_apic_init_mappings();
1266 x86_init
.hyper
.guest_late_init();
1268 e820__reserve_resources();
1269 e820__register_nosave_regions(max_low_pfn
);
1271 x86_init
.resources
.reserve_resources();
1273 e820__setup_pci_gap();
1276 #if defined(CONFIG_VGA_CONSOLE)
1277 if (!efi_enabled(EFI_BOOT
) || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY
))
1278 conswitchp
= &vga_con
;
1279 #elif defined(CONFIG_DUMMY_CONSOLE)
1280 conswitchp
= &dummy_con
;
1283 x86_init
.oem
.banner();
1285 x86_init
.timers
.wallclock_init();
1289 arch_init_ideal_nops();
1291 register_refined_jiffies(CLOCK_TICK_RATE
);
1294 if (efi_enabled(EFI_BOOT
))
1295 efi_apply_memmap_quirks();
1301 #ifdef CONFIG_X86_32
1303 static struct resource video_ram_resource
= {
1304 .name
= "Video RAM area",
1307 .flags
= IORESOURCE_BUSY
| IORESOURCE_MEM
1310 void __init
i386_reserve_resources(void)
1312 request_resource(&iomem_resource
, &video_ram_resource
);
1313 reserve_standard_io_resources();
1316 #endif /* CONFIG_X86_32 */
1318 static struct notifier_block kernel_offset_notifier
= {
1319 .notifier_call
= dump_kernel_offset
1322 static int __init
register_kernel_offset_dumper(void)
1324 atomic_notifier_chain_register(&panic_notifier_list
,
1325 &kernel_offset_notifier
);
1328 __initcall(register_kernel_offset_dumper
);
1330 void arch_show_smap(struct seq_file
*m
, struct vm_area_struct
*vma
)
1332 if (!boot_cpu_has(X86_FEATURE_OSPKE
))
1335 seq_printf(m
, "ProtectionKey: %8u\n", vma_pkey(vma
));