2 * linux/arch/x86_64/mm/init.c
4 * Copyright (C) 1995 Linus Torvalds
5 * Copyright (C) 2000 Pavel Machek <pavel@ucw.cz>
6 * Copyright (C) 2002,2003 Andi Kleen <ak@suse.de>
9 #include <linux/signal.h>
10 #include <linux/sched.h>
11 #include <linux/kernel.h>
12 #include <linux/errno.h>
13 #include <linux/string.h>
14 #include <linux/types.h>
15 #include <linux/ptrace.h>
16 #include <linux/mman.h>
18 #include <linux/swap.h>
19 #include <linux/smp.h>
20 #include <linux/init.h>
21 #include <linux/initrd.h>
22 #include <linux/pagemap.h>
23 #include <linux/bootmem.h>
24 #include <linux/proc_fs.h>
25 #include <linux/pci.h>
26 #include <linux/pfn.h>
27 #include <linux/poison.h>
28 #include <linux/dma-mapping.h>
29 #include <linux/module.h>
30 #include <linux/memory_hotplug.h>
31 #include <linux/nmi.h>
32 #include <linux/gfp.h>
34 #include <asm/processor.h>
35 #include <asm/bios_ebda.h>
36 #include <asm/system.h>
37 #include <asm/uaccess.h>
38 #include <asm/pgtable.h>
39 #include <asm/pgalloc.h>
41 #include <asm/fixmap.h>
45 #include <asm/mmu_context.h>
46 #include <asm/proto.h>
48 #include <asm/sections.h>
49 #include <asm/kdebug.h>
51 #include <asm/cacheflush.h>
53 #include <linux/bootmem.h>
55 static unsigned long dma_reserve __initdata
;
57 static int __init
parse_direct_gbpages_off(char *arg
)
62 early_param("nogbpages", parse_direct_gbpages_off
);
64 static int __init
parse_direct_gbpages_on(char *arg
)
69 early_param("gbpages", parse_direct_gbpages_on
);
72 * NOTE: pagetable_init alloc all the fixmap pagetables contiguous on the
73 * physical space so we can cache the place of the first one and move
74 * around without checking the pgd every time.
77 pteval_t __supported_pte_mask __read_mostly
= ~_PAGE_IOMAP
;
78 EXPORT_SYMBOL_GPL(__supported_pte_mask
);
80 int force_personality32
;
84 * Control non executable heap for 32bit processes.
85 * To control the stack too use noexec=off
87 * on PROT_READ does not imply PROT_EXEC for 32-bit processes (default)
88 * off PROT_READ implies PROT_EXEC
90 static int __init
nonx32_setup(char *str
)
92 if (!strcmp(str
, "on"))
93 force_personality32
&= ~READ_IMPLIES_EXEC
;
94 else if (!strcmp(str
, "off"))
95 force_personality32
|= READ_IMPLIES_EXEC
;
98 __setup("noexec32=", nonx32_setup
);
101 * NOTE: This function is marked __ref because it calls __init function
102 * (alloc_bootmem_pages). It's safe to do it ONLY when after_bootmem == 0.
104 static __ref
void *spp_getpage(void)
109 ptr
= (void *) get_zeroed_page(GFP_ATOMIC
| __GFP_NOTRACK
);
111 ptr
= alloc_bootmem_pages(PAGE_SIZE
);
113 if (!ptr
|| ((unsigned long)ptr
& ~PAGE_MASK
)) {
114 panic("set_pte_phys: cannot allocate page data %s\n",
115 after_bootmem
? "after bootmem" : "");
118 pr_debug("spp_getpage %p\n", ptr
);
123 static pud_t
*fill_pud(pgd_t
*pgd
, unsigned long vaddr
)
125 if (pgd_none(*pgd
)) {
126 pud_t
*pud
= (pud_t
*)spp_getpage();
127 pgd_populate(&init_mm
, pgd
, pud
);
128 if (pud
!= pud_offset(pgd
, 0))
129 printk(KERN_ERR
"PAGETABLE BUG #00! %p <-> %p\n",
130 pud
, pud_offset(pgd
, 0));
132 return pud_offset(pgd
, vaddr
);
135 static pmd_t
*fill_pmd(pud_t
*pud
, unsigned long vaddr
)
137 if (pud_none(*pud
)) {
138 pmd_t
*pmd
= (pmd_t
*) spp_getpage();
139 pud_populate(&init_mm
, pud
, pmd
);
140 if (pmd
!= pmd_offset(pud
, 0))
141 printk(KERN_ERR
"PAGETABLE BUG #01! %p <-> %p\n",
142 pmd
, pmd_offset(pud
, 0));
144 return pmd_offset(pud
, vaddr
);
147 static pte_t
*fill_pte(pmd_t
*pmd
, unsigned long vaddr
)
149 if (pmd_none(*pmd
)) {
150 pte_t
*pte
= (pte_t
*) spp_getpage();
151 pmd_populate_kernel(&init_mm
, pmd
, pte
);
152 if (pte
!= pte_offset_kernel(pmd
, 0))
153 printk(KERN_ERR
"PAGETABLE BUG #02!\n");
155 return pte_offset_kernel(pmd
, vaddr
);
158 void set_pte_vaddr_pud(pud_t
*pud_page
, unsigned long vaddr
, pte_t new_pte
)
164 pud
= pud_page
+ pud_index(vaddr
);
165 pmd
= fill_pmd(pud
, vaddr
);
166 pte
= fill_pte(pmd
, vaddr
);
168 set_pte(pte
, new_pte
);
171 * It's enough to flush this one mapping.
172 * (PGE mappings get flushed as well)
174 __flush_tlb_one(vaddr
);
177 void set_pte_vaddr(unsigned long vaddr
, pte_t pteval
)
182 pr_debug("set_pte_vaddr %lx to %lx\n", vaddr
, native_pte_val(pteval
));
184 pgd
= pgd_offset_k(vaddr
);
185 if (pgd_none(*pgd
)) {
187 "PGD FIXMAP MISSING, it should be setup in head.S!\n");
190 pud_page
= (pud_t
*)pgd_page_vaddr(*pgd
);
191 set_pte_vaddr_pud(pud_page
, vaddr
, pteval
);
194 pmd_t
* __init
populate_extra_pmd(unsigned long vaddr
)
199 pgd
= pgd_offset_k(vaddr
);
200 pud
= fill_pud(pgd
, vaddr
);
201 return fill_pmd(pud
, vaddr
);
204 pte_t
* __init
populate_extra_pte(unsigned long vaddr
)
208 pmd
= populate_extra_pmd(vaddr
);
209 return fill_pte(pmd
, vaddr
);
213 * Create large page table mappings for a range of physical addresses.
215 static void __init
__init_extra_mapping(unsigned long phys
, unsigned long size
,
222 BUG_ON((phys
& ~PMD_MASK
) || (size
& ~PMD_MASK
));
223 for (; size
; phys
+= PMD_SIZE
, size
-= PMD_SIZE
) {
224 pgd
= pgd_offset_k((unsigned long)__va(phys
));
225 if (pgd_none(*pgd
)) {
226 pud
= (pud_t
*) spp_getpage();
227 set_pgd(pgd
, __pgd(__pa(pud
) | _KERNPG_TABLE
|
230 pud
= pud_offset(pgd
, (unsigned long)__va(phys
));
231 if (pud_none(*pud
)) {
232 pmd
= (pmd_t
*) spp_getpage();
233 set_pud(pud
, __pud(__pa(pmd
) | _KERNPG_TABLE
|
236 pmd
= pmd_offset(pud
, phys
);
237 BUG_ON(!pmd_none(*pmd
));
238 set_pmd(pmd
, __pmd(phys
| pgprot_val(prot
)));
242 void __init
init_extra_mapping_wb(unsigned long phys
, unsigned long size
)
244 __init_extra_mapping(phys
, size
, PAGE_KERNEL_LARGE
);
247 void __init
init_extra_mapping_uc(unsigned long phys
, unsigned long size
)
249 __init_extra_mapping(phys
, size
, PAGE_KERNEL_LARGE_NOCACHE
);
253 * The head.S code sets up the kernel high mapping:
255 * from __START_KERNEL_map to __START_KERNEL_map + size (== _end-_text)
257 * phys_addr holds the negative offset to the kernel, which is added
258 * to the compile time generated pmds. This results in invalid pmds up
259 * to the point where we hit the physaddr 0 mapping.
261 * We limit the mappings to the region from _text to _end. _end is
262 * rounded up to the 2MB boundary. This catches the invalid pmds as
263 * well, as they are located before _text:
265 void __init
cleanup_highmap(void)
267 unsigned long vaddr
= __START_KERNEL_map
;
268 unsigned long end
= roundup((unsigned long)_end
, PMD_SIZE
) - 1;
269 pmd_t
*pmd
= level2_kernel_pgt
;
270 pmd_t
*last_pmd
= pmd
+ PTRS_PER_PMD
;
272 for (; pmd
< last_pmd
; pmd
++, vaddr
+= PMD_SIZE
) {
275 if (vaddr
< (unsigned long) _text
|| vaddr
> end
)
276 set_pmd(pmd
, __pmd(0));
280 static __ref
void *alloc_low_page(unsigned long *phys
)
282 unsigned long pfn
= e820_table_end
++;
286 adr
= (void *)get_zeroed_page(GFP_ATOMIC
| __GFP_NOTRACK
);
292 if (pfn
>= e820_table_top
)
293 panic("alloc_low_page: ran out of memory");
295 adr
= early_memremap(pfn
* PAGE_SIZE
, PAGE_SIZE
);
296 memset(adr
, 0, PAGE_SIZE
);
297 *phys
= pfn
* PAGE_SIZE
;
301 static __ref
void unmap_low_page(void *adr
)
306 early_iounmap(adr
, PAGE_SIZE
);
309 static unsigned long __meminit
310 phys_pte_init(pte_t
*pte_page
, unsigned long addr
, unsigned long end
,
314 unsigned long last_map_addr
= end
;
317 pte_t
*pte
= pte_page
+ pte_index(addr
);
319 for(i
= pte_index(addr
); i
< PTRS_PER_PTE
; i
++, addr
+= PAGE_SIZE
, pte
++) {
322 if (!after_bootmem
) {
323 for(; i
< PTRS_PER_PTE
; i
++, pte
++)
324 set_pte(pte
, __pte(0));
330 * We will re-use the existing mapping.
331 * Xen for example has some special requirements, like mapping
332 * pagetable pages as RO. So assume someone who pre-setup
333 * these mappings are more intelligent.
341 printk(" pte=%p addr=%lx pte=%016lx\n",
342 pte
, addr
, pfn_pte(addr
>> PAGE_SHIFT
, PAGE_KERNEL
).pte
);
344 set_pte(pte
, pfn_pte(addr
>> PAGE_SHIFT
, prot
));
345 last_map_addr
= (addr
& PAGE_MASK
) + PAGE_SIZE
;
348 update_page_count(PG_LEVEL_4K
, pages
);
350 return last_map_addr
;
353 static unsigned long __meminit
354 phys_pte_update(pmd_t
*pmd
, unsigned long address
, unsigned long end
,
357 pte_t
*pte
= (pte_t
*)pmd_page_vaddr(*pmd
);
359 return phys_pte_init(pte
, address
, end
, prot
);
362 static unsigned long __meminit
363 phys_pmd_init(pmd_t
*pmd_page
, unsigned long address
, unsigned long end
,
364 unsigned long page_size_mask
, pgprot_t prot
)
366 unsigned long pages
= 0;
367 unsigned long last_map_addr
= end
;
369 int i
= pmd_index(address
);
371 for (; i
< PTRS_PER_PMD
; i
++, address
+= PMD_SIZE
) {
372 unsigned long pte_phys
;
373 pmd_t
*pmd
= pmd_page
+ pmd_index(address
);
375 pgprot_t new_prot
= prot
;
377 if (address
>= end
) {
378 if (!after_bootmem
) {
379 for (; i
< PTRS_PER_PMD
; i
++, pmd
++)
380 set_pmd(pmd
, __pmd(0));
386 if (!pmd_large(*pmd
)) {
387 spin_lock(&init_mm
.page_table_lock
);
388 last_map_addr
= phys_pte_update(pmd
, address
,
390 spin_unlock(&init_mm
.page_table_lock
);
394 * If we are ok with PG_LEVEL_2M mapping, then we will
395 * use the existing mapping,
397 * Otherwise, we will split the large page mapping but
398 * use the same existing protection bits except for
399 * large page, so that we don't violate Intel's TLB
400 * Application note (317080) which says, while changing
401 * the page sizes, new and old translations should
402 * not differ with respect to page frame and
405 if (page_size_mask
& (1 << PG_LEVEL_2M
)) {
409 new_prot
= pte_pgprot(pte_clrhuge(*(pte_t
*)pmd
));
412 if (page_size_mask
& (1<<PG_LEVEL_2M
)) {
414 spin_lock(&init_mm
.page_table_lock
);
415 set_pte((pte_t
*)pmd
,
416 pfn_pte(address
>> PAGE_SHIFT
,
417 __pgprot(pgprot_val(prot
) | _PAGE_PSE
)));
418 spin_unlock(&init_mm
.page_table_lock
);
419 last_map_addr
= (address
& PMD_MASK
) + PMD_SIZE
;
423 pte
= alloc_low_page(&pte_phys
);
424 last_map_addr
= phys_pte_init(pte
, address
, end
, new_prot
);
427 spin_lock(&init_mm
.page_table_lock
);
428 pmd_populate_kernel(&init_mm
, pmd
, __va(pte_phys
));
429 spin_unlock(&init_mm
.page_table_lock
);
431 update_page_count(PG_LEVEL_2M
, pages
);
432 return last_map_addr
;
435 static unsigned long __meminit
436 phys_pmd_update(pud_t
*pud
, unsigned long address
, unsigned long end
,
437 unsigned long page_size_mask
, pgprot_t prot
)
439 pmd_t
*pmd
= pmd_offset(pud
, 0);
440 unsigned long last_map_addr
;
442 last_map_addr
= phys_pmd_init(pmd
, address
, end
, page_size_mask
, prot
);
444 return last_map_addr
;
447 static unsigned long __meminit
448 phys_pud_init(pud_t
*pud_page
, unsigned long addr
, unsigned long end
,
449 unsigned long page_size_mask
)
451 unsigned long pages
= 0;
452 unsigned long last_map_addr
= end
;
453 int i
= pud_index(addr
);
455 for (; i
< PTRS_PER_PUD
; i
++, addr
= (addr
& PUD_MASK
) + PUD_SIZE
) {
456 unsigned long pmd_phys
;
457 pud_t
*pud
= pud_page
+ pud_index(addr
);
459 pgprot_t prot
= PAGE_KERNEL
;
464 if (!after_bootmem
&&
465 !e820_any_mapped(addr
, addr
+PUD_SIZE
, 0)) {
466 set_pud(pud
, __pud(0));
471 if (!pud_large(*pud
)) {
472 last_map_addr
= phys_pmd_update(pud
, addr
, end
,
473 page_size_mask
, prot
);
477 * If we are ok with PG_LEVEL_1G mapping, then we will
478 * use the existing mapping.
480 * Otherwise, we will split the gbpage mapping but use
481 * the same existing protection bits except for large
482 * page, so that we don't violate Intel's TLB
483 * Application note (317080) which says, while changing
484 * the page sizes, new and old translations should
485 * not differ with respect to page frame and
488 if (page_size_mask
& (1 << PG_LEVEL_1G
)) {
492 prot
= pte_pgprot(pte_clrhuge(*(pte_t
*)pud
));
495 if (page_size_mask
& (1<<PG_LEVEL_1G
)) {
497 spin_lock(&init_mm
.page_table_lock
);
498 set_pte((pte_t
*)pud
,
499 pfn_pte(addr
>> PAGE_SHIFT
, PAGE_KERNEL_LARGE
));
500 spin_unlock(&init_mm
.page_table_lock
);
501 last_map_addr
= (addr
& PUD_MASK
) + PUD_SIZE
;
505 pmd
= alloc_low_page(&pmd_phys
);
506 last_map_addr
= phys_pmd_init(pmd
, addr
, end
, page_size_mask
,
510 spin_lock(&init_mm
.page_table_lock
);
511 pud_populate(&init_mm
, pud
, __va(pmd_phys
));
512 spin_unlock(&init_mm
.page_table_lock
);
516 update_page_count(PG_LEVEL_1G
, pages
);
518 return last_map_addr
;
521 static unsigned long __meminit
522 phys_pud_update(pgd_t
*pgd
, unsigned long addr
, unsigned long end
,
523 unsigned long page_size_mask
)
527 pud
= (pud_t
*)pgd_page_vaddr(*pgd
);
529 return phys_pud_init(pud
, addr
, end
, page_size_mask
);
532 unsigned long __meminit
533 kernel_physical_mapping_init(unsigned long start
,
535 unsigned long page_size_mask
)
538 unsigned long next
, last_map_addr
= end
;
540 start
= (unsigned long)__va(start
);
541 end
= (unsigned long)__va(end
);
543 for (; start
< end
; start
= next
) {
544 pgd_t
*pgd
= pgd_offset_k(start
);
545 unsigned long pud_phys
;
548 next
= (start
+ PGDIR_SIZE
) & PGDIR_MASK
;
553 last_map_addr
= phys_pud_update(pgd
, __pa(start
),
554 __pa(end
), page_size_mask
);
558 pud
= alloc_low_page(&pud_phys
);
559 last_map_addr
= phys_pud_init(pud
, __pa(start
), __pa(next
),
563 spin_lock(&init_mm
.page_table_lock
);
564 pgd_populate(&init_mm
, pgd
, __va(pud_phys
));
565 spin_unlock(&init_mm
.page_table_lock
);
569 return last_map_addr
;
573 void __init
initmem_init(unsigned long start_pfn
, unsigned long end_pfn
,
576 #ifndef CONFIG_NO_BOOTMEM
577 unsigned long bootmap_size
, bootmap
;
579 bootmap_size
= bootmem_bootmap_pages(end_pfn
)<<PAGE_SHIFT
;
580 bootmap
= find_e820_area(0, end_pfn
<<PAGE_SHIFT
, bootmap_size
,
583 panic("Cannot find bootmem map of size %ld\n", bootmap_size
);
584 reserve_early(bootmap
, bootmap
+ bootmap_size
, "BOOTMAP");
585 /* don't touch min_low_pfn */
586 bootmap_size
= init_bootmem_node(NODE_DATA(0), bootmap
>> PAGE_SHIFT
,
588 e820_register_active_regions(0, start_pfn
, end_pfn
);
589 free_bootmem_with_active_regions(0, end_pfn
);
591 e820_register_active_regions(0, start_pfn
, end_pfn
);
596 void __init
paging_init(void)
598 unsigned long max_zone_pfns
[MAX_NR_ZONES
];
600 memset(max_zone_pfns
, 0, sizeof(max_zone_pfns
));
601 max_zone_pfns
[ZONE_DMA
] = MAX_DMA_PFN
;
602 max_zone_pfns
[ZONE_DMA32
] = MAX_DMA32_PFN
;
603 max_zone_pfns
[ZONE_NORMAL
] = max_pfn
;
605 sparse_memory_present_with_active_regions(MAX_NUMNODES
);
609 * clear the default setting with node 0
610 * note: don't use nodes_clear here, that is really clearing when
611 * numa support is not compiled in, and later node_set_state
612 * will not set it back.
614 node_clear_state(0, N_NORMAL_MEMORY
);
616 free_area_init_nodes(max_zone_pfns
);
620 * Memory hotplug specific functions
622 #ifdef CONFIG_MEMORY_HOTPLUG
624 * After memory hotplug the variables max_pfn, max_low_pfn and high_memory need
627 static void update_end_of_memory_vars(u64 start
, u64 size
)
629 unsigned long end_pfn
= PFN_UP(start
+ size
);
631 if (end_pfn
> max_pfn
) {
633 max_low_pfn
= end_pfn
;
634 high_memory
= (void *)__va(max_pfn
* PAGE_SIZE
- 1) + 1;
639 * Memory is added always to NORMAL zone. This means you will never get
640 * additional DMA/DMA32 memory.
642 int arch_add_memory(int nid
, u64 start
, u64 size
)
644 struct pglist_data
*pgdat
= NODE_DATA(nid
);
645 struct zone
*zone
= pgdat
->node_zones
+ ZONE_NORMAL
;
646 unsigned long last_mapped_pfn
, start_pfn
= start
>> PAGE_SHIFT
;
647 unsigned long nr_pages
= size
>> PAGE_SHIFT
;
650 last_mapped_pfn
= init_memory_mapping(start
, start
+ size
);
651 if (last_mapped_pfn
> max_pfn_mapped
)
652 max_pfn_mapped
= last_mapped_pfn
;
654 ret
= __add_pages(nid
, zone
, start_pfn
, nr_pages
);
657 /* update max_pfn, max_low_pfn and high_memory */
658 update_end_of_memory_vars(start
, size
);
662 EXPORT_SYMBOL_GPL(arch_add_memory
);
664 #if !defined(CONFIG_ACPI_NUMA) && defined(CONFIG_NUMA)
665 int memory_add_physaddr_to_nid(u64 start
)
669 EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid
);
672 #endif /* CONFIG_MEMORY_HOTPLUG */
674 static struct kcore_list kcore_vsyscall
;
676 void __init
mem_init(void)
678 long codesize
, reservedpages
, datasize
, initsize
;
679 unsigned long absent_pages
;
683 /* clear_bss() already clear the empty_zero_page */
687 /* this will put all low memory onto the freelists */
689 totalram_pages
= numa_free_all_bootmem();
691 totalram_pages
= free_all_bootmem();
694 absent_pages
= absent_pages_in_range(0, max_pfn
);
695 reservedpages
= max_pfn
- totalram_pages
- absent_pages
;
698 codesize
= (unsigned long) &_etext
- (unsigned long) &_text
;
699 datasize
= (unsigned long) &_edata
- (unsigned long) &_etext
;
700 initsize
= (unsigned long) &__init_end
- (unsigned long) &__init_begin
;
702 /* Register memory areas for /proc/kcore */
703 kclist_add(&kcore_vsyscall
, (void *)VSYSCALL_START
,
704 VSYSCALL_END
- VSYSCALL_START
, KCORE_OTHER
);
706 printk(KERN_INFO
"Memory: %luk/%luk available (%ldk kernel code, "
707 "%ldk absent, %ldk reserved, %ldk data, %ldk init)\n",
708 nr_free_pages() << (PAGE_SHIFT
-10),
709 max_pfn
<< (PAGE_SHIFT
-10),
711 absent_pages
<< (PAGE_SHIFT
-10),
712 reservedpages
<< (PAGE_SHIFT
-10),
717 #ifdef CONFIG_DEBUG_RODATA
718 const int rodata_test_data
= 0xC3;
719 EXPORT_SYMBOL_GPL(rodata_test_data
);
721 int kernel_set_to_readonly
;
723 void set_kernel_text_rw(void)
725 unsigned long start
= PFN_ALIGN(_text
);
726 unsigned long end
= PFN_ALIGN(__stop___ex_table
);
728 if (!kernel_set_to_readonly
)
731 pr_debug("Set kernel text: %lx - %lx for read write\n",
735 * Make the kernel identity mapping for text RW. Kernel text
736 * mapping will always be RO. Refer to the comment in
737 * static_protections() in pageattr.c
739 set_memory_rw(start
, (end
- start
) >> PAGE_SHIFT
);
742 void set_kernel_text_ro(void)
744 unsigned long start
= PFN_ALIGN(_text
);
745 unsigned long end
= PFN_ALIGN(__stop___ex_table
);
747 if (!kernel_set_to_readonly
)
750 pr_debug("Set kernel text: %lx - %lx for read only\n",
754 * Set the kernel identity mapping for text RO.
756 set_memory_ro(start
, (end
- start
) >> PAGE_SHIFT
);
759 void mark_rodata_ro(void)
761 unsigned long start
= PFN_ALIGN(_text
);
762 unsigned long rodata_start
=
763 ((unsigned long)__start_rodata
+ PAGE_SIZE
- 1) & PAGE_MASK
;
764 unsigned long end
= (unsigned long) &__end_rodata_hpage_align
;
765 unsigned long text_end
= PAGE_ALIGN((unsigned long) &__stop___ex_table
);
766 unsigned long rodata_end
= PAGE_ALIGN((unsigned long) &__end_rodata
);
767 unsigned long data_start
= (unsigned long) &_sdata
;
769 printk(KERN_INFO
"Write protecting the kernel read-only data: %luk\n",
770 (end
- start
) >> 10);
771 set_memory_ro(start
, (end
- start
) >> PAGE_SHIFT
);
773 kernel_set_to_readonly
= 1;
776 * The rodata section (but not the kernel text!) should also be
779 set_memory_nx(rodata_start
, (end
- rodata_start
) >> PAGE_SHIFT
);
783 #ifdef CONFIG_CPA_DEBUG
784 printk(KERN_INFO
"Testing CPA: undo %lx-%lx\n", start
, end
);
785 set_memory_rw(start
, (end
-start
) >> PAGE_SHIFT
);
787 printk(KERN_INFO
"Testing CPA: again\n");
788 set_memory_ro(start
, (end
-start
) >> PAGE_SHIFT
);
791 free_init_pages("unused kernel memory",
792 (unsigned long) page_address(virt_to_page(text_end
)),
794 page_address(virt_to_page(rodata_start
)));
795 free_init_pages("unused kernel memory",
796 (unsigned long) page_address(virt_to_page(rodata_end
)),
797 (unsigned long) page_address(virt_to_page(data_start
)));
802 int __init
reserve_bootmem_generic(unsigned long phys
, unsigned long len
,
809 unsigned long pfn
= phys
>> PAGE_SHIFT
;
811 if (pfn
>= max_pfn
) {
813 * This can happen with kdump kernels when accessing
816 if (pfn
< max_pfn_mapped
)
819 printk(KERN_ERR
"reserve_bootmem: illegal reserve %lx %lu\n",
824 /* Should check here against the e820 map to avoid double free */
826 nid
= phys_to_nid(phys
);
827 next_nid
= phys_to_nid(phys
+ len
- 1);
829 ret
= reserve_bootmem_node(NODE_DATA(nid
), phys
, len
, flags
);
831 ret
= reserve_bootmem(phys
, len
, flags
);
837 reserve_bootmem(phys
, len
, flags
);
840 if (phys
+len
<= MAX_DMA_PFN
*PAGE_SIZE
) {
841 dma_reserve
+= len
/ PAGE_SIZE
;
842 set_dma_reserve(dma_reserve
);
848 int kern_addr_valid(unsigned long addr
)
850 unsigned long above
= ((long)addr
) >> __VIRTUAL_MASK_SHIFT
;
856 if (above
!= 0 && above
!= -1UL)
859 pgd
= pgd_offset_k(addr
);
863 pud
= pud_offset(pgd
, addr
);
867 pmd
= pmd_offset(pud
, addr
);
872 return pfn_valid(pmd_pfn(*pmd
));
874 pte
= pte_offset_kernel(pmd
, addr
);
878 return pfn_valid(pte_pfn(*pte
));
882 * A pseudo VMA to allow ptrace access for the vsyscall page. This only
883 * covers the 64bit vsyscall page now. 32bit has a real VMA now and does
884 * not need special handling anymore:
886 static struct vm_area_struct gate_vma
= {
887 .vm_start
= VSYSCALL_START
,
888 .vm_end
= VSYSCALL_START
+ (VSYSCALL_MAPPED_PAGES
* PAGE_SIZE
),
889 .vm_page_prot
= PAGE_READONLY_EXEC
,
890 .vm_flags
= VM_READ
| VM_EXEC
893 struct vm_area_struct
*get_gate_vma(struct task_struct
*tsk
)
895 #ifdef CONFIG_IA32_EMULATION
896 if (test_tsk_thread_flag(tsk
, TIF_IA32
))
902 int in_gate_area(struct task_struct
*task
, unsigned long addr
)
904 struct vm_area_struct
*vma
= get_gate_vma(task
);
909 return (addr
>= vma
->vm_start
) && (addr
< vma
->vm_end
);
913 * Use this when you have no reliable task/vma, typically from interrupt
914 * context. It is less reliable than using the task's vma and may give
917 int in_gate_area_no_task(unsigned long addr
)
919 return (addr
>= VSYSCALL_START
) && (addr
< VSYSCALL_END
);
922 const char *arch_vma_name(struct vm_area_struct
*vma
)
924 if (vma
->vm_mm
&& vma
->vm_start
== (long)vma
->vm_mm
->context
.vdso
)
926 if (vma
== &gate_vma
)
931 #ifdef CONFIG_SPARSEMEM_VMEMMAP
933 * Initialise the sparsemem vmemmap using huge-pages at the PMD level.
935 static long __meminitdata addr_start
, addr_end
;
936 static void __meminitdata
*p_start
, *p_end
;
937 static int __meminitdata node_start
;
940 vmemmap_populate(struct page
*start_page
, unsigned long size
, int node
)
942 unsigned long addr
= (unsigned long)start_page
;
943 unsigned long end
= (unsigned long)(start_page
+ size
);
949 for (; addr
< end
; addr
= next
) {
952 pgd
= vmemmap_pgd_populate(addr
, node
);
956 pud
= vmemmap_pud_populate(pgd
, addr
, node
);
961 next
= (addr
+ PAGE_SIZE
) & PAGE_MASK
;
962 pmd
= vmemmap_pmd_populate(pud
, addr
, node
);
967 p
= vmemmap_pte_populate(pmd
, addr
, node
);
972 addr_end
= addr
+ PAGE_SIZE
;
973 p_end
= p
+ PAGE_SIZE
;
975 next
= pmd_addr_end(addr
, end
);
977 pmd
= pmd_offset(pud
, addr
);
978 if (pmd_none(*pmd
)) {
981 p
= vmemmap_alloc_block_buf(PMD_SIZE
, node
);
985 entry
= pfn_pte(__pa(p
) >> PAGE_SHIFT
,
987 set_pmd(pmd
, __pmd(pte_val(entry
)));
989 /* check to see if we have contiguous blocks */
990 if (p_end
!= p
|| node_start
!= node
) {
992 printk(KERN_DEBUG
" [%lx-%lx] PMD -> [%p-%p] on node %d\n",
993 addr_start
, addr_end
-1, p_start
, p_end
-1, node_start
);
999 addr_end
= addr
+ PMD_SIZE
;
1000 p_end
= p
+ PMD_SIZE
;
1002 vmemmap_verify((pte_t
*)pmd
, node
, addr
, next
);
1009 void __meminit
vmemmap_populate_print_last(void)
1012 printk(KERN_DEBUG
" [%lx-%lx] PMD -> [%p-%p] on node %d\n",
1013 addr_start
, addr_end
-1, p_start
, p_end
-1, node_start
);