3 * Copyright (C) 2004 Benjamin Herrenschmidt, IBM Corp.
4 * <benh@kernel.crashing.org>
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
12 #include <linux/errno.h>
13 #include <linux/sched.h>
14 #include <linux/kernel.h>
16 #include <linux/smp.h>
17 #include <linux/stddef.h>
18 #include <linux/unistd.h>
19 #include <linux/slab.h>
20 #include <linux/user.h>
21 #include <linux/elf.h>
22 #include <linux/security.h>
23 #include <linux/bootmem.h>
24 #include <linux/memblock.h>
26 #include <asm/pgtable.h>
27 #include <asm/processor.h>
29 #include <asm/mmu_context.h>
31 #include <asm/machdep.h>
32 #include <asm/cputable.h>
33 #include <asm/sections.h>
34 #include <asm/firmware.h>
36 #include <asm/vdso_datapage.h>
43 #define DBG(fmt...) printk(fmt)
48 /* Max supported size for symbol names */
49 #define MAX_SYMNAME 64
51 /* The alignment of the vDSO */
52 #define VDSO_ALIGNMENT (1 << 16)
54 extern char vdso32_start
, vdso32_end
;
55 static void *vdso32_kbase
= &vdso32_start
;
56 static unsigned int vdso32_pages
;
57 static struct page
**vdso32_pagelist
;
58 unsigned long vdso32_sigtramp
;
59 unsigned long vdso32_rt_sigtramp
;
62 extern char vdso64_start
, vdso64_end
;
63 static void *vdso64_kbase
= &vdso64_start
;
64 static unsigned int vdso64_pages
;
65 static struct page
**vdso64_pagelist
;
66 unsigned long vdso64_rt_sigtramp
;
67 #endif /* CONFIG_PPC64 */
69 static int vdso_ready
;
72 * The vdso data page (aka. systemcfg for old ppc64 fans) is here.
73 * Once the early boot kernel code no longer needs to muck around
74 * with it, it will become dynamically allocated
77 struct vdso_data data
;
79 } vdso_data_store __page_aligned_data
;
80 struct vdso_data
*vdso_data
= &vdso_data_store
.data
;
82 /* Format of the patch table */
85 unsigned long ftr_mask
, ftr_value
;
90 /* Table of functions to patch based on the CPU type/revision
92 * Currently, we only change sync_dicache to do nothing on processors
93 * with a coherent icache
95 static struct vdso_patch_def vdso_patches
[] = {
97 CPU_FTR_COHERENT_ICACHE
, CPU_FTR_COHERENT_ICACHE
,
98 "__kernel_sync_dicache", "__kernel_sync_dicache_p5"
102 "__kernel_gettimeofday", NULL
106 "__kernel_clock_gettime", NULL
110 "__kernel_clock_getres", NULL
114 "__kernel_get_tbfreq", NULL
118 "__kernel_time", NULL
123 * Some infos carried around for each of them during parsing at
128 Elf32_Ehdr
*hdr
; /* ptr to ELF */
129 Elf32_Sym
*dynsym
; /* ptr to .dynsym section */
130 unsigned long dynsymsize
; /* size of .dynsym section */
131 char *dynstr
; /* ptr to .dynstr section */
132 unsigned long text
; /* offset of .text section in .so */
139 unsigned long dynsymsize
;
146 static void dump_one_vdso_page(struct page
*pg
, struct page
*upg
)
148 printk("kpg: %p (c:%d,f:%08lx)", __va(page_to_pfn(pg
) << PAGE_SHIFT
),
151 if (upg
&& !IS_ERR(upg
) /* && pg != upg*/) {
152 printk(" upg: %p (c:%d,f:%08lx)", __va(page_to_pfn(upg
)
160 static void dump_vdso_pages(struct vm_area_struct
* vma
)
164 if (!vma
|| is_32bit_task()) {
165 printk("vDSO32 @ %016lx:\n", (unsigned long)vdso32_kbase
);
166 for (i
=0; i
<vdso32_pages
; i
++) {
167 struct page
*pg
= virt_to_page(vdso32_kbase
+
169 struct page
*upg
= (vma
&& vma
->vm_mm
) ?
170 follow_page(vma
, vma
->vm_start
+ i
*PAGE_SIZE
, 0)
172 dump_one_vdso_page(pg
, upg
);
175 if (!vma
|| !is_32bit_task()) {
176 printk("vDSO64 @ %016lx:\n", (unsigned long)vdso64_kbase
);
177 for (i
=0; i
<vdso64_pages
; i
++) {
178 struct page
*pg
= virt_to_page(vdso64_kbase
+
180 struct page
*upg
= (vma
&& vma
->vm_mm
) ?
181 follow_page(vma
, vma
->vm_start
+ i
*PAGE_SIZE
, 0)
183 dump_one_vdso_page(pg
, upg
);
190 * This is called from binfmt_elf, we create the special vma for the
191 * vDSO and insert it into the mm struct tree
193 int arch_setup_additional_pages(struct linux_binprm
*bprm
, int uses_interp
)
195 struct mm_struct
*mm
= current
->mm
;
196 struct page
**vdso_pagelist
;
197 unsigned long vdso_pages
;
198 unsigned long vdso_base
;
205 if (is_32bit_task()) {
206 vdso_pagelist
= vdso32_pagelist
;
207 vdso_pages
= vdso32_pages
;
208 vdso_base
= VDSO32_MBASE
;
210 vdso_pagelist
= vdso64_pagelist
;
211 vdso_pages
= vdso64_pages
;
213 * On 64bit we don't have a preferred map address. This
214 * allows get_unmapped_area to find an area near other mmaps
215 * and most likely share a SLB entry.
220 vdso_pagelist
= vdso32_pagelist
;
221 vdso_pages
= vdso32_pages
;
222 vdso_base
= VDSO32_MBASE
;
225 current
->mm
->context
.vdso_base
= 0;
227 /* vDSO has a problem and was disabled, just don't "enable" it for the
232 /* Add a page to the vdso size for the data page */
236 * pick a base address for the vDSO in process space. We try to put it
237 * at vdso_base which is the "natural" base for it, but we might fail
238 * and end up putting it elsewhere.
239 * Add enough to the size so that the result can be aligned.
241 down_write(&mm
->mmap_sem
);
242 vdso_base
= get_unmapped_area(NULL
, vdso_base
,
243 (vdso_pages
<< PAGE_SHIFT
) +
244 ((VDSO_ALIGNMENT
- 1) & PAGE_MASK
),
246 if (IS_ERR_VALUE(vdso_base
)) {
251 /* Add required alignment. */
252 vdso_base
= ALIGN(vdso_base
, VDSO_ALIGNMENT
);
255 * Put vDSO base into mm struct. We need to do this before calling
256 * install_special_mapping or the perf counter mmap tracking code
257 * will fail to recognise it as a vDSO (since arch_vma_name fails).
259 current
->mm
->context
.vdso_base
= vdso_base
;
262 * our vma flags don't have VM_WRITE so by default, the process isn't
263 * allowed to write those pages.
264 * gdb can break that with ptrace interface, and thus trigger COW on
265 * those pages but it's then your responsibility to never do that on
266 * the "data" page of the vDSO or you'll stop getting kernel updates
267 * and your nice userland gettimeofday will be totally dead.
268 * It's fine to use that for setting breakpoints in the vDSO code
271 rc
= install_special_mapping(mm
, vdso_base
, vdso_pages
<< PAGE_SHIFT
,
273 VM_MAYREAD
|VM_MAYWRITE
|VM_MAYEXEC
,
276 current
->mm
->context
.vdso_base
= 0;
280 up_write(&mm
->mmap_sem
);
284 up_write(&mm
->mmap_sem
);
288 const char *arch_vma_name(struct vm_area_struct
*vma
)
290 if (vma
->vm_mm
&& vma
->vm_start
== vma
->vm_mm
->context
.vdso_base
)
297 static void * __init
find_section32(Elf32_Ehdr
*ehdr
, const char *secname
,
304 /* Grab section headers and strings so we can tell who is who */
305 sechdrs
= (void *)ehdr
+ ehdr
->e_shoff
;
306 secnames
= (void *)ehdr
+ sechdrs
[ehdr
->e_shstrndx
].sh_offset
;
308 /* Find the section they want */
309 for (i
= 1; i
< ehdr
->e_shnum
; i
++) {
310 if (strcmp(secnames
+sechdrs
[i
].sh_name
, secname
) == 0) {
312 *size
= sechdrs
[i
].sh_size
;
313 return (void *)ehdr
+ sechdrs
[i
].sh_offset
;
320 static Elf32_Sym
* __init
find_symbol32(struct lib32_elfinfo
*lib
,
324 char name
[MAX_SYMNAME
], *c
;
326 for (i
= 0; i
< (lib
->dynsymsize
/ sizeof(Elf32_Sym
)); i
++) {
327 if (lib
->dynsym
[i
].st_name
== 0)
329 strlcpy(name
, lib
->dynstr
+ lib
->dynsym
[i
].st_name
,
331 c
= strchr(name
, '@');
334 if (strcmp(symname
, name
) == 0)
335 return &lib
->dynsym
[i
];
340 /* Note that we assume the section is .text and the symbol is relative to
343 static unsigned long __init
find_function32(struct lib32_elfinfo
*lib
,
346 Elf32_Sym
*sym
= find_symbol32(lib
, symname
);
349 printk(KERN_WARNING
"vDSO32: function %s not found !\n",
353 return sym
->st_value
- VDSO32_LBASE
;
356 static int __init
vdso_do_func_patch32(struct lib32_elfinfo
*v32
,
357 struct lib64_elfinfo
*v64
,
358 const char *orig
, const char *fix
)
360 Elf32_Sym
*sym32_gen
, *sym32_fix
;
362 sym32_gen
= find_symbol32(v32
, orig
);
363 if (sym32_gen
== NULL
) {
364 printk(KERN_ERR
"vDSO32: Can't find symbol %s !\n", orig
);
368 sym32_gen
->st_name
= 0;
371 sym32_fix
= find_symbol32(v32
, fix
);
372 if (sym32_fix
== NULL
) {
373 printk(KERN_ERR
"vDSO32: Can't find symbol %s !\n", fix
);
376 sym32_gen
->st_value
= sym32_fix
->st_value
;
377 sym32_gen
->st_size
= sym32_fix
->st_size
;
378 sym32_gen
->st_info
= sym32_fix
->st_info
;
379 sym32_gen
->st_other
= sym32_fix
->st_other
;
380 sym32_gen
->st_shndx
= sym32_fix
->st_shndx
;
388 static void * __init
find_section64(Elf64_Ehdr
*ehdr
, const char *secname
,
395 /* Grab section headers and strings so we can tell who is who */
396 sechdrs
= (void *)ehdr
+ ehdr
->e_shoff
;
397 secnames
= (void *)ehdr
+ sechdrs
[ehdr
->e_shstrndx
].sh_offset
;
399 /* Find the section they want */
400 for (i
= 1; i
< ehdr
->e_shnum
; i
++) {
401 if (strcmp(secnames
+sechdrs
[i
].sh_name
, secname
) == 0) {
403 *size
= sechdrs
[i
].sh_size
;
404 return (void *)ehdr
+ sechdrs
[i
].sh_offset
;
412 static Elf64_Sym
* __init
find_symbol64(struct lib64_elfinfo
*lib
,
416 char name
[MAX_SYMNAME
], *c
;
418 for (i
= 0; i
< (lib
->dynsymsize
/ sizeof(Elf64_Sym
)); i
++) {
419 if (lib
->dynsym
[i
].st_name
== 0)
421 strlcpy(name
, lib
->dynstr
+ lib
->dynsym
[i
].st_name
,
423 c
= strchr(name
, '@');
426 if (strcmp(symname
, name
) == 0)
427 return &lib
->dynsym
[i
];
432 /* Note that we assume the section is .text and the symbol is relative to
435 static unsigned long __init
find_function64(struct lib64_elfinfo
*lib
,
438 Elf64_Sym
*sym
= find_symbol64(lib
, symname
);
441 printk(KERN_WARNING
"vDSO64: function %s not found !\n",
445 #ifdef VDS64_HAS_DESCRIPTORS
446 return *((u64
*)(vdso64_kbase
+ sym
->st_value
- VDSO64_LBASE
)) -
449 return sym
->st_value
- VDSO64_LBASE
;
453 static int __init
vdso_do_func_patch64(struct lib32_elfinfo
*v32
,
454 struct lib64_elfinfo
*v64
,
455 const char *orig
, const char *fix
)
457 Elf64_Sym
*sym64_gen
, *sym64_fix
;
459 sym64_gen
= find_symbol64(v64
, orig
);
460 if (sym64_gen
== NULL
) {
461 printk(KERN_ERR
"vDSO64: Can't find symbol %s !\n", orig
);
465 sym64_gen
->st_name
= 0;
468 sym64_fix
= find_symbol64(v64
, fix
);
469 if (sym64_fix
== NULL
) {
470 printk(KERN_ERR
"vDSO64: Can't find symbol %s !\n", fix
);
473 sym64_gen
->st_value
= sym64_fix
->st_value
;
474 sym64_gen
->st_size
= sym64_fix
->st_size
;
475 sym64_gen
->st_info
= sym64_fix
->st_info
;
476 sym64_gen
->st_other
= sym64_fix
->st_other
;
477 sym64_gen
->st_shndx
= sym64_fix
->st_shndx
;
482 #endif /* CONFIG_PPC64 */
485 static __init
int vdso_do_find_sections(struct lib32_elfinfo
*v32
,
486 struct lib64_elfinfo
*v64
)
491 * Locate symbol tables & text section
494 v32
->dynsym
= find_section32(v32
->hdr
, ".dynsym", &v32
->dynsymsize
);
495 v32
->dynstr
= find_section32(v32
->hdr
, ".dynstr", NULL
);
496 if (v32
->dynsym
== NULL
|| v32
->dynstr
== NULL
) {
497 printk(KERN_ERR
"vDSO32: required symbol section not found\n");
500 sect
= find_section32(v32
->hdr
, ".text", NULL
);
502 printk(KERN_ERR
"vDSO32: the .text section was not found\n");
505 v32
->text
= sect
- vdso32_kbase
;
508 v64
->dynsym
= find_section64(v64
->hdr
, ".dynsym", &v64
->dynsymsize
);
509 v64
->dynstr
= find_section64(v64
->hdr
, ".dynstr", NULL
);
510 if (v64
->dynsym
== NULL
|| v64
->dynstr
== NULL
) {
511 printk(KERN_ERR
"vDSO64: required symbol section not found\n");
514 sect
= find_section64(v64
->hdr
, ".text", NULL
);
516 printk(KERN_ERR
"vDSO64: the .text section was not found\n");
519 v64
->text
= sect
- vdso64_kbase
;
520 #endif /* CONFIG_PPC64 */
525 static __init
void vdso_setup_trampolines(struct lib32_elfinfo
*v32
,
526 struct lib64_elfinfo
*v64
)
529 * Find signal trampolines
533 vdso64_rt_sigtramp
= find_function64(v64
, "__kernel_sigtramp_rt64");
535 vdso32_sigtramp
= find_function32(v32
, "__kernel_sigtramp32");
536 vdso32_rt_sigtramp
= find_function32(v32
, "__kernel_sigtramp_rt32");
539 static __init
int vdso_fixup_datapage(struct lib32_elfinfo
*v32
,
540 struct lib64_elfinfo
*v64
)
546 sym64
= find_symbol64(v64
, "__kernel_datapage_offset");
548 printk(KERN_ERR
"vDSO64: Can't find symbol "
549 "__kernel_datapage_offset !\n");
552 *((int *)(vdso64_kbase
+ sym64
->st_value
- VDSO64_LBASE
)) =
553 (vdso64_pages
<< PAGE_SHIFT
) -
554 (sym64
->st_value
- VDSO64_LBASE
);
555 #endif /* CONFIG_PPC64 */
557 sym32
= find_symbol32(v32
, "__kernel_datapage_offset");
559 printk(KERN_ERR
"vDSO32: Can't find symbol "
560 "__kernel_datapage_offset !\n");
563 *((int *)(vdso32_kbase
+ (sym32
->st_value
- VDSO32_LBASE
))) =
564 (vdso32_pages
<< PAGE_SHIFT
) -
565 (sym32
->st_value
- VDSO32_LBASE
);
571 static __init
int vdso_fixup_features(struct lib32_elfinfo
*v32
,
572 struct lib64_elfinfo
*v64
)
575 unsigned long size32
;
579 unsigned long size64
;
581 start64
= find_section64(v64
->hdr
, "__ftr_fixup", &size64
);
583 do_feature_fixups(cur_cpu_spec
->cpu_features
,
584 start64
, start64
+ size64
);
586 start64
= find_section64(v64
->hdr
, "__mmu_ftr_fixup", &size64
);
588 do_feature_fixups(cur_cpu_spec
->mmu_features
,
589 start64
, start64
+ size64
);
591 start64
= find_section64(v64
->hdr
, "__fw_ftr_fixup", &size64
);
593 do_feature_fixups(powerpc_firmware_features
,
594 start64
, start64
+ size64
);
596 start64
= find_section64(v64
->hdr
, "__lwsync_fixup", &size64
);
598 do_lwsync_fixups(cur_cpu_spec
->cpu_features
,
599 start64
, start64
+ size64
);
600 #endif /* CONFIG_PPC64 */
602 start32
= find_section32(v32
->hdr
, "__ftr_fixup", &size32
);
604 do_feature_fixups(cur_cpu_spec
->cpu_features
,
605 start32
, start32
+ size32
);
607 start32
= find_section32(v32
->hdr
, "__mmu_ftr_fixup", &size32
);
609 do_feature_fixups(cur_cpu_spec
->mmu_features
,
610 start32
, start32
+ size32
);
613 start32
= find_section32(v32
->hdr
, "__fw_ftr_fixup", &size32
);
615 do_feature_fixups(powerpc_firmware_features
,
616 start32
, start32
+ size32
);
617 #endif /* CONFIG_PPC64 */
619 start32
= find_section32(v32
->hdr
, "__lwsync_fixup", &size32
);
621 do_lwsync_fixups(cur_cpu_spec
->cpu_features
,
622 start32
, start32
+ size32
);
627 static __init
int vdso_fixup_alt_funcs(struct lib32_elfinfo
*v32
,
628 struct lib64_elfinfo
*v64
)
632 for (i
= 0; i
< ARRAY_SIZE(vdso_patches
); i
++) {
633 struct vdso_patch_def
*patch
= &vdso_patches
[i
];
634 int match
= (cur_cpu_spec
->cpu_features
& patch
->ftr_mask
)
639 DBG("replacing %s with %s...\n", patch
->gen_name
,
640 patch
->fix_name
? "NONE" : patch
->fix_name
);
643 * Patch the 32 bits and 64 bits symbols. Note that we do not
644 * patch the "." symbol on 64 bits.
645 * It would be easy to do, but doesn't seem to be necessary,
646 * patching the OPD symbol is enough.
648 vdso_do_func_patch32(v32
, v64
, patch
->gen_name
,
651 vdso_do_func_patch64(v32
, v64
, patch
->gen_name
,
653 #endif /* CONFIG_PPC64 */
660 static __init
int vdso_setup(void)
662 struct lib32_elfinfo v32
;
663 struct lib64_elfinfo v64
;
665 v32
.hdr
= vdso32_kbase
;
667 v64
.hdr
= vdso64_kbase
;
669 if (vdso_do_find_sections(&v32
, &v64
))
672 if (vdso_fixup_datapage(&v32
, &v64
))
675 if (vdso_fixup_features(&v32
, &v64
))
678 if (vdso_fixup_alt_funcs(&v32
, &v64
))
681 vdso_setup_trampolines(&v32
, &v64
);
687 * Called from setup_arch to initialize the bitmap of available
688 * syscalls in the systemcfg page
690 static void __init
vdso_setup_syscall_map(void)
693 extern unsigned long *sys_call_table
;
694 extern unsigned long sys_ni_syscall
;
697 for (i
= 0; i
< __NR_syscalls
; i
++) {
699 if (sys_call_table
[i
*2] != sys_ni_syscall
)
700 vdso_data
->syscall_map_64
[i
>> 5] |=
701 0x80000000UL
>> (i
& 0x1f);
702 if (sys_call_table
[i
*2+1] != sys_ni_syscall
)
703 vdso_data
->syscall_map_32
[i
>> 5] |=
704 0x80000000UL
>> (i
& 0x1f);
705 #else /* CONFIG_PPC64 */
706 if (sys_call_table
[i
] != sys_ni_syscall
)
707 vdso_data
->syscall_map_32
[i
>> 5] |=
708 0x80000000UL
>> (i
& 0x1f);
709 #endif /* CONFIG_PPC64 */
714 int vdso_getcpu_init(void)
716 unsigned long cpu
, node
, val
;
719 * SPRG3 contains the CPU in the bottom 16 bits and the NUMA node in
720 * the next 16 bits. The VDSO uses this to implement getcpu().
723 WARN_ON_ONCE(cpu
> 0xffff);
725 node
= cpu_to_node(cpu
);
726 WARN_ON_ONCE(node
> 0xffff);
728 val
= (cpu
& 0xfff) | ((node
& 0xffff) << 16);
729 mtspr(SPRN_SPRG3
, val
);
730 get_paca()->sprg3
= val
;
736 /* We need to call this before SMP init */
737 early_initcall(vdso_getcpu_init
);
740 static int __init
vdso_init(void)
746 * Fill up the "systemcfg" stuff for backward compatibility
748 strcpy((char *)vdso_data
->eye_catcher
, "SYSTEMCFG:PPC64");
749 vdso_data
->version
.major
= SYSTEMCFG_MAJOR
;
750 vdso_data
->version
.minor
= SYSTEMCFG_MINOR
;
751 vdso_data
->processor
= mfspr(SPRN_PVR
);
753 * Fake the old platform number for pSeries and add
754 * in LPAR bit if necessary
756 vdso_data
->platform
= 0x100;
757 if (firmware_has_feature(FW_FEATURE_LPAR
))
758 vdso_data
->platform
|= 1;
759 vdso_data
->physicalMemorySize
= memblock_phys_mem_size();
760 vdso_data
->dcache_size
= ppc64_caches
.dsize
;
761 vdso_data
->dcache_line_size
= ppc64_caches
.dline_size
;
762 vdso_data
->icache_size
= ppc64_caches
.isize
;
763 vdso_data
->icache_line_size
= ppc64_caches
.iline_size
;
765 /* XXXOJN: Blocks should be added to ppc64_caches and used instead */
766 vdso_data
->dcache_block_size
= ppc64_caches
.dline_size
;
767 vdso_data
->icache_block_size
= ppc64_caches
.iline_size
;
768 vdso_data
->dcache_log_block_size
= ppc64_caches
.log_dline_size
;
769 vdso_data
->icache_log_block_size
= ppc64_caches
.log_iline_size
;
772 * Calculate the size of the 64 bits vDSO
774 vdso64_pages
= (&vdso64_end
- &vdso64_start
) >> PAGE_SHIFT
;
775 DBG("vdso64_kbase: %p, 0x%x pages\n", vdso64_kbase
, vdso64_pages
);
777 vdso_data
->dcache_block_size
= L1_CACHE_BYTES
;
778 vdso_data
->dcache_log_block_size
= L1_CACHE_SHIFT
;
779 vdso_data
->icache_block_size
= L1_CACHE_BYTES
;
780 vdso_data
->icache_log_block_size
= L1_CACHE_SHIFT
;
781 #endif /* CONFIG_PPC64 */
785 * Calculate the size of the 32 bits vDSO
787 vdso32_pages
= (&vdso32_end
- &vdso32_start
) >> PAGE_SHIFT
;
788 DBG("vdso32_kbase: %p, 0x%x pages\n", vdso32_kbase
, vdso32_pages
);
792 * Setup the syscall map in the vDOS
794 vdso_setup_syscall_map();
797 * Initialize the vDSO images in memory, that is do necessary
798 * fixups of vDSO symbols, locate trampolines, etc...
801 printk(KERN_ERR
"vDSO setup failure, not enabled !\n");
809 /* Make sure pages are in the correct state */
810 vdso32_pagelist
= kzalloc(sizeof(struct page
*) * (vdso32_pages
+ 2),
812 BUG_ON(vdso32_pagelist
== NULL
);
813 for (i
= 0; i
< vdso32_pages
; i
++) {
814 struct page
*pg
= virt_to_page(vdso32_kbase
+ i
*PAGE_SIZE
);
815 ClearPageReserved(pg
);
817 vdso32_pagelist
[i
] = pg
;
819 vdso32_pagelist
[i
++] = virt_to_page(vdso_data
);
820 vdso32_pagelist
[i
] = NULL
;
823 vdso64_pagelist
= kzalloc(sizeof(struct page
*) * (vdso64_pages
+ 2),
825 BUG_ON(vdso64_pagelist
== NULL
);
826 for (i
= 0; i
< vdso64_pages
; i
++) {
827 struct page
*pg
= virt_to_page(vdso64_kbase
+ i
*PAGE_SIZE
);
828 ClearPageReserved(pg
);
830 vdso64_pagelist
[i
] = pg
;
832 vdso64_pagelist
[i
++] = virt_to_page(vdso_data
);
833 vdso64_pagelist
[i
] = NULL
;
834 #endif /* CONFIG_PPC64 */
836 get_page(virt_to_page(vdso_data
));
843 arch_initcall(vdso_init
);
845 int in_gate_area_no_mm(unsigned long addr
)
850 int in_gate_area(struct mm_struct
*mm
, unsigned long addr
)
855 struct vm_area_struct
*get_gate_vma(struct mm_struct
*mm
)