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>
37 #include <asm/setup.h>
42 #define DBG(fmt...) printk(fmt)
47 /* Max supported size for symbol names */
48 #define MAX_SYMNAME 64
50 /* The alignment of the vDSO */
51 #define VDSO_ALIGNMENT (1 << 16)
53 extern char vdso32_start
, vdso32_end
;
54 static void *vdso32_kbase
= &vdso32_start
;
55 static unsigned int vdso32_pages
;
56 static struct page
**vdso32_pagelist
;
57 unsigned long vdso32_sigtramp
;
58 unsigned long vdso32_rt_sigtramp
;
61 extern char vdso64_start
, vdso64_end
;
62 static void *vdso64_kbase
= &vdso64_start
;
63 static unsigned int vdso64_pages
;
64 static struct page
**vdso64_pagelist
;
65 unsigned long vdso64_rt_sigtramp
;
66 #endif /* CONFIG_PPC64 */
68 static int vdso_ready
;
71 * The vdso data page (aka. systemcfg for old ppc64 fans) is here.
72 * Once the early boot kernel code no longer needs to muck around
73 * with it, it will become dynamically allocated
76 struct vdso_data data
;
78 } vdso_data_store __page_aligned_data
;
79 struct vdso_data
*vdso_data
= &vdso_data_store
.data
;
81 /* Format of the patch table */
84 unsigned long ftr_mask
, ftr_value
;
89 /* Table of functions to patch based on the CPU type/revision
91 * Currently, we only change sync_dicache to do nothing on processors
92 * with a coherent icache
94 static struct vdso_patch_def vdso_patches
[] = {
96 CPU_FTR_COHERENT_ICACHE
, CPU_FTR_COHERENT_ICACHE
,
97 "__kernel_sync_dicache", "__kernel_sync_dicache_p5"
101 "__kernel_gettimeofday", NULL
105 "__kernel_clock_gettime", NULL
109 "__kernel_clock_getres", NULL
113 "__kernel_get_tbfreq", NULL
117 "__kernel_time", NULL
122 * Some infos carried around for each of them during parsing at
127 Elf32_Ehdr
*hdr
; /* ptr to ELF */
128 Elf32_Sym
*dynsym
; /* ptr to .dynsym section */
129 unsigned long dynsymsize
; /* size of .dynsym section */
130 char *dynstr
; /* ptr to .dynstr section */
131 unsigned long text
; /* offset of .text section in .so */
138 unsigned long dynsymsize
;
145 static void dump_one_vdso_page(struct page
*pg
, struct page
*upg
)
147 printk("kpg: %p (c:%d,f:%08lx)", __va(page_to_pfn(pg
) << PAGE_SHIFT
),
150 if (upg
&& !IS_ERR(upg
) /* && pg != upg*/) {
151 printk(" upg: %p (c:%d,f:%08lx)", __va(page_to_pfn(upg
)
159 static void dump_vdso_pages(struct vm_area_struct
* vma
)
163 if (!vma
|| is_32bit_task()) {
164 printk("vDSO32 @ %016lx:\n", (unsigned long)vdso32_kbase
);
165 for (i
=0; i
<vdso32_pages
; i
++) {
166 struct page
*pg
= virt_to_page(vdso32_kbase
+
168 struct page
*upg
= (vma
&& vma
->vm_mm
) ?
169 follow_page(vma
, vma
->vm_start
+ i
*PAGE_SIZE
, 0)
171 dump_one_vdso_page(pg
, upg
);
174 if (!vma
|| !is_32bit_task()) {
175 printk("vDSO64 @ %016lx:\n", (unsigned long)vdso64_kbase
);
176 for (i
=0; i
<vdso64_pages
; i
++) {
177 struct page
*pg
= virt_to_page(vdso64_kbase
+
179 struct page
*upg
= (vma
&& vma
->vm_mm
) ?
180 follow_page(vma
, vma
->vm_start
+ i
*PAGE_SIZE
, 0)
182 dump_one_vdso_page(pg
, upg
);
189 * This is called from binfmt_elf, we create the special vma for the
190 * vDSO and insert it into the mm struct tree
192 int arch_setup_additional_pages(struct linux_binprm
*bprm
, int uses_interp
)
194 struct mm_struct
*mm
= current
->mm
;
195 struct page
**vdso_pagelist
;
196 unsigned long vdso_pages
;
197 unsigned long vdso_base
;
204 if (is_32bit_task()) {
205 vdso_pagelist
= vdso32_pagelist
;
206 vdso_pages
= vdso32_pages
;
207 vdso_base
= VDSO32_MBASE
;
209 vdso_pagelist
= vdso64_pagelist
;
210 vdso_pages
= vdso64_pages
;
212 * On 64bit we don't have a preferred map address. This
213 * allows get_unmapped_area to find an area near other mmaps
214 * and most likely share a SLB entry.
219 vdso_pagelist
= vdso32_pagelist
;
220 vdso_pages
= vdso32_pages
;
221 vdso_base
= VDSO32_MBASE
;
224 current
->mm
->context
.vdso_base
= 0;
226 /* vDSO has a problem and was disabled, just don't "enable" it for the
231 /* Add a page to the vdso size for the data page */
235 * pick a base address for the vDSO in process space. We try to put it
236 * at vdso_base which is the "natural" base for it, but we might fail
237 * and end up putting it elsewhere.
238 * Add enough to the size so that the result can be aligned.
240 down_write(&mm
->mmap_sem
);
241 vdso_base
= get_unmapped_area(NULL
, vdso_base
,
242 (vdso_pages
<< PAGE_SHIFT
) +
243 ((VDSO_ALIGNMENT
- 1) & PAGE_MASK
),
245 if (IS_ERR_VALUE(vdso_base
)) {
250 /* Add required alignment. */
251 vdso_base
= ALIGN(vdso_base
, VDSO_ALIGNMENT
);
254 * Put vDSO base into mm struct. We need to do this before calling
255 * install_special_mapping or the perf counter mmap tracking code
256 * will fail to recognise it as a vDSO (since arch_vma_name fails).
258 current
->mm
->context
.vdso_base
= vdso_base
;
261 * our vma flags don't have VM_WRITE so by default, the process isn't
262 * allowed to write those pages.
263 * gdb can break that with ptrace interface, and thus trigger COW on
264 * those pages but it's then your responsibility to never do that on
265 * the "data" page of the vDSO or you'll stop getting kernel updates
266 * and your nice userland gettimeofday will be totally dead.
267 * It's fine to use that for setting breakpoints in the vDSO code
270 rc
= install_special_mapping(mm
, vdso_base
, vdso_pages
<< PAGE_SHIFT
,
272 VM_MAYREAD
|VM_MAYWRITE
|VM_MAYEXEC
,
275 current
->mm
->context
.vdso_base
= 0;
279 up_write(&mm
->mmap_sem
);
283 up_write(&mm
->mmap_sem
);
287 const char *arch_vma_name(struct vm_area_struct
*vma
)
289 if (vma
->vm_mm
&& vma
->vm_start
== vma
->vm_mm
->context
.vdso_base
)
296 static void * __init
find_section32(Elf32_Ehdr
*ehdr
, const char *secname
,
303 /* Grab section headers and strings so we can tell who is who */
304 sechdrs
= (void *)ehdr
+ ehdr
->e_shoff
;
305 secnames
= (void *)ehdr
+ sechdrs
[ehdr
->e_shstrndx
].sh_offset
;
307 /* Find the section they want */
308 for (i
= 1; i
< ehdr
->e_shnum
; i
++) {
309 if (strcmp(secnames
+sechdrs
[i
].sh_name
, secname
) == 0) {
311 *size
= sechdrs
[i
].sh_size
;
312 return (void *)ehdr
+ sechdrs
[i
].sh_offset
;
319 static Elf32_Sym
* __init
find_symbol32(struct lib32_elfinfo
*lib
,
323 char name
[MAX_SYMNAME
], *c
;
325 for (i
= 0; i
< (lib
->dynsymsize
/ sizeof(Elf32_Sym
)); i
++) {
326 if (lib
->dynsym
[i
].st_name
== 0)
328 strlcpy(name
, lib
->dynstr
+ lib
->dynsym
[i
].st_name
,
330 c
= strchr(name
, '@');
333 if (strcmp(symname
, name
) == 0)
334 return &lib
->dynsym
[i
];
339 /* Note that we assume the section is .text and the symbol is relative to
342 static unsigned long __init
find_function32(struct lib32_elfinfo
*lib
,
345 Elf32_Sym
*sym
= find_symbol32(lib
, symname
);
348 printk(KERN_WARNING
"vDSO32: function %s not found !\n",
352 return sym
->st_value
- VDSO32_LBASE
;
355 static int __init
vdso_do_func_patch32(struct lib32_elfinfo
*v32
,
356 struct lib64_elfinfo
*v64
,
357 const char *orig
, const char *fix
)
359 Elf32_Sym
*sym32_gen
, *sym32_fix
;
361 sym32_gen
= find_symbol32(v32
, orig
);
362 if (sym32_gen
== NULL
) {
363 printk(KERN_ERR
"vDSO32: Can't find symbol %s !\n", orig
);
367 sym32_gen
->st_name
= 0;
370 sym32_fix
= find_symbol32(v32
, fix
);
371 if (sym32_fix
== NULL
) {
372 printk(KERN_ERR
"vDSO32: Can't find symbol %s !\n", fix
);
375 sym32_gen
->st_value
= sym32_fix
->st_value
;
376 sym32_gen
->st_size
= sym32_fix
->st_size
;
377 sym32_gen
->st_info
= sym32_fix
->st_info
;
378 sym32_gen
->st_other
= sym32_fix
->st_other
;
379 sym32_gen
->st_shndx
= sym32_fix
->st_shndx
;
387 static void * __init
find_section64(Elf64_Ehdr
*ehdr
, const char *secname
,
394 /* Grab section headers and strings so we can tell who is who */
395 sechdrs
= (void *)ehdr
+ ehdr
->e_shoff
;
396 secnames
= (void *)ehdr
+ sechdrs
[ehdr
->e_shstrndx
].sh_offset
;
398 /* Find the section they want */
399 for (i
= 1; i
< ehdr
->e_shnum
; i
++) {
400 if (strcmp(secnames
+sechdrs
[i
].sh_name
, secname
) == 0) {
402 *size
= sechdrs
[i
].sh_size
;
403 return (void *)ehdr
+ sechdrs
[i
].sh_offset
;
411 static Elf64_Sym
* __init
find_symbol64(struct lib64_elfinfo
*lib
,
415 char name
[MAX_SYMNAME
], *c
;
417 for (i
= 0; i
< (lib
->dynsymsize
/ sizeof(Elf64_Sym
)); i
++) {
418 if (lib
->dynsym
[i
].st_name
== 0)
420 strlcpy(name
, lib
->dynstr
+ lib
->dynsym
[i
].st_name
,
422 c
= strchr(name
, '@');
425 if (strcmp(symname
, name
) == 0)
426 return &lib
->dynsym
[i
];
431 /* Note that we assume the section is .text and the symbol is relative to
434 static unsigned long __init
find_function64(struct lib64_elfinfo
*lib
,
437 Elf64_Sym
*sym
= find_symbol64(lib
, symname
);
440 printk(KERN_WARNING
"vDSO64: function %s not found !\n",
444 #ifdef VDS64_HAS_DESCRIPTORS
445 return *((u64
*)(vdso64_kbase
+ sym
->st_value
- VDSO64_LBASE
)) -
448 return sym
->st_value
- VDSO64_LBASE
;
452 static int __init
vdso_do_func_patch64(struct lib32_elfinfo
*v32
,
453 struct lib64_elfinfo
*v64
,
454 const char *orig
, const char *fix
)
456 Elf64_Sym
*sym64_gen
, *sym64_fix
;
458 sym64_gen
= find_symbol64(v64
, orig
);
459 if (sym64_gen
== NULL
) {
460 printk(KERN_ERR
"vDSO64: Can't find symbol %s !\n", orig
);
464 sym64_gen
->st_name
= 0;
467 sym64_fix
= find_symbol64(v64
, fix
);
468 if (sym64_fix
== NULL
) {
469 printk(KERN_ERR
"vDSO64: Can't find symbol %s !\n", fix
);
472 sym64_gen
->st_value
= sym64_fix
->st_value
;
473 sym64_gen
->st_size
= sym64_fix
->st_size
;
474 sym64_gen
->st_info
= sym64_fix
->st_info
;
475 sym64_gen
->st_other
= sym64_fix
->st_other
;
476 sym64_gen
->st_shndx
= sym64_fix
->st_shndx
;
481 #endif /* CONFIG_PPC64 */
484 static __init
int vdso_do_find_sections(struct lib32_elfinfo
*v32
,
485 struct lib64_elfinfo
*v64
)
490 * Locate symbol tables & text section
493 v32
->dynsym
= find_section32(v32
->hdr
, ".dynsym", &v32
->dynsymsize
);
494 v32
->dynstr
= find_section32(v32
->hdr
, ".dynstr", NULL
);
495 if (v32
->dynsym
== NULL
|| v32
->dynstr
== NULL
) {
496 printk(KERN_ERR
"vDSO32: required symbol section not found\n");
499 sect
= find_section32(v32
->hdr
, ".text", NULL
);
501 printk(KERN_ERR
"vDSO32: the .text section was not found\n");
504 v32
->text
= sect
- vdso32_kbase
;
507 v64
->dynsym
= find_section64(v64
->hdr
, ".dynsym", &v64
->dynsymsize
);
508 v64
->dynstr
= find_section64(v64
->hdr
, ".dynstr", NULL
);
509 if (v64
->dynsym
== NULL
|| v64
->dynstr
== NULL
) {
510 printk(KERN_ERR
"vDSO64: required symbol section not found\n");
513 sect
= find_section64(v64
->hdr
, ".text", NULL
);
515 printk(KERN_ERR
"vDSO64: the .text section was not found\n");
518 v64
->text
= sect
- vdso64_kbase
;
519 #endif /* CONFIG_PPC64 */
524 static __init
void vdso_setup_trampolines(struct lib32_elfinfo
*v32
,
525 struct lib64_elfinfo
*v64
)
528 * Find signal trampolines
532 vdso64_rt_sigtramp
= find_function64(v64
, "__kernel_sigtramp_rt64");
534 vdso32_sigtramp
= find_function32(v32
, "__kernel_sigtramp32");
535 vdso32_rt_sigtramp
= find_function32(v32
, "__kernel_sigtramp_rt32");
538 static __init
int vdso_fixup_datapage(struct lib32_elfinfo
*v32
,
539 struct lib64_elfinfo
*v64
)
545 sym64
= find_symbol64(v64
, "__kernel_datapage_offset");
547 printk(KERN_ERR
"vDSO64: Can't find symbol "
548 "__kernel_datapage_offset !\n");
551 *((int *)(vdso64_kbase
+ sym64
->st_value
- VDSO64_LBASE
)) =
552 (vdso64_pages
<< PAGE_SHIFT
) -
553 (sym64
->st_value
- VDSO64_LBASE
);
554 #endif /* CONFIG_PPC64 */
556 sym32
= find_symbol32(v32
, "__kernel_datapage_offset");
558 printk(KERN_ERR
"vDSO32: Can't find symbol "
559 "__kernel_datapage_offset !\n");
562 *((int *)(vdso32_kbase
+ (sym32
->st_value
- VDSO32_LBASE
))) =
563 (vdso32_pages
<< PAGE_SHIFT
) -
564 (sym32
->st_value
- VDSO32_LBASE
);
570 static __init
int vdso_fixup_features(struct lib32_elfinfo
*v32
,
571 struct lib64_elfinfo
*v64
)
574 unsigned long size32
;
578 unsigned long size64
;
580 start64
= find_section64(v64
->hdr
, "__ftr_fixup", &size64
);
582 do_feature_fixups(cur_cpu_spec
->cpu_features
,
583 start64
, start64
+ size64
);
585 start64
= find_section64(v64
->hdr
, "__mmu_ftr_fixup", &size64
);
587 do_feature_fixups(cur_cpu_spec
->mmu_features
,
588 start64
, start64
+ size64
);
590 start64
= find_section64(v64
->hdr
, "__fw_ftr_fixup", &size64
);
592 do_feature_fixups(powerpc_firmware_features
,
593 start64
, start64
+ size64
);
595 start64
= find_section64(v64
->hdr
, "__lwsync_fixup", &size64
);
597 do_lwsync_fixups(cur_cpu_spec
->cpu_features
,
598 start64
, start64
+ size64
);
599 #endif /* CONFIG_PPC64 */
601 start32
= find_section32(v32
->hdr
, "__ftr_fixup", &size32
);
603 do_feature_fixups(cur_cpu_spec
->cpu_features
,
604 start32
, start32
+ size32
);
606 start32
= find_section32(v32
->hdr
, "__mmu_ftr_fixup", &size32
);
608 do_feature_fixups(cur_cpu_spec
->mmu_features
,
609 start32
, start32
+ size32
);
612 start32
= find_section32(v32
->hdr
, "__fw_ftr_fixup", &size32
);
614 do_feature_fixups(powerpc_firmware_features
,
615 start32
, start32
+ size32
);
616 #endif /* CONFIG_PPC64 */
618 start32
= find_section32(v32
->hdr
, "__lwsync_fixup", &size32
);
620 do_lwsync_fixups(cur_cpu_spec
->cpu_features
,
621 start32
, start32
+ size32
);
626 static __init
int vdso_fixup_alt_funcs(struct lib32_elfinfo
*v32
,
627 struct lib64_elfinfo
*v64
)
631 for (i
= 0; i
< ARRAY_SIZE(vdso_patches
); i
++) {
632 struct vdso_patch_def
*patch
= &vdso_patches
[i
];
633 int match
= (cur_cpu_spec
->cpu_features
& patch
->ftr_mask
)
638 DBG("replacing %s with %s...\n", patch
->gen_name
,
639 patch
->fix_name
? "NONE" : patch
->fix_name
);
642 * Patch the 32 bits and 64 bits symbols. Note that we do not
643 * patch the "." symbol on 64 bits.
644 * It would be easy to do, but doesn't seem to be necessary,
645 * patching the OPD symbol is enough.
647 vdso_do_func_patch32(v32
, v64
, patch
->gen_name
,
650 vdso_do_func_patch64(v32
, v64
, patch
->gen_name
,
652 #endif /* CONFIG_PPC64 */
659 static __init
int vdso_setup(void)
661 struct lib32_elfinfo v32
;
662 struct lib64_elfinfo v64
;
664 v32
.hdr
= vdso32_kbase
;
666 v64
.hdr
= vdso64_kbase
;
668 if (vdso_do_find_sections(&v32
, &v64
))
671 if (vdso_fixup_datapage(&v32
, &v64
))
674 if (vdso_fixup_features(&v32
, &v64
))
677 if (vdso_fixup_alt_funcs(&v32
, &v64
))
680 vdso_setup_trampolines(&v32
, &v64
);
686 * Called from setup_arch to initialize the bitmap of available
687 * syscalls in the systemcfg page
689 static void __init
vdso_setup_syscall_map(void)
692 extern unsigned long *sys_call_table
;
693 extern unsigned long sys_ni_syscall
;
696 for (i
= 0; i
< __NR_syscalls
; i
++) {
698 if (sys_call_table
[i
*2] != sys_ni_syscall
)
699 vdso_data
->syscall_map_64
[i
>> 5] |=
700 0x80000000UL
>> (i
& 0x1f);
701 if (sys_call_table
[i
*2+1] != sys_ni_syscall
)
702 vdso_data
->syscall_map_32
[i
>> 5] |=
703 0x80000000UL
>> (i
& 0x1f);
704 #else /* CONFIG_PPC64 */
705 if (sys_call_table
[i
] != sys_ni_syscall
)
706 vdso_data
->syscall_map_32
[i
>> 5] |=
707 0x80000000UL
>> (i
& 0x1f);
708 #endif /* CONFIG_PPC64 */
713 int vdso_getcpu_init(void)
715 unsigned long cpu
, node
, val
;
718 * SPRG_VDSO contains the CPU in the bottom 16 bits and the NUMA node
719 * in the next 16 bits. The VDSO uses this to implement getcpu().
722 WARN_ON_ONCE(cpu
> 0xffff);
724 node
= cpu_to_node(cpu
);
725 WARN_ON_ONCE(node
> 0xffff);
727 val
= (cpu
& 0xfff) | ((node
& 0xffff) << 16);
728 mtspr(SPRN_SPRG_VDSO_WRITE
, val
);
729 get_paca()->sprg_vdso
= val
;
735 /* We need to call this before SMP init */
736 early_initcall(vdso_getcpu_init
);
739 static int __init
vdso_init(void)
745 * Fill up the "systemcfg" stuff for backward compatibility
747 strcpy((char *)vdso_data
->eye_catcher
, "SYSTEMCFG:PPC64");
748 vdso_data
->version
.major
= SYSTEMCFG_MAJOR
;
749 vdso_data
->version
.minor
= SYSTEMCFG_MINOR
;
750 vdso_data
->processor
= mfspr(SPRN_PVR
);
752 * Fake the old platform number for pSeries and add
753 * in LPAR bit if necessary
755 vdso_data
->platform
= 0x100;
756 if (firmware_has_feature(FW_FEATURE_LPAR
))
757 vdso_data
->platform
|= 1;
758 vdso_data
->physicalMemorySize
= memblock_phys_mem_size();
759 vdso_data
->dcache_size
= ppc64_caches
.dsize
;
760 vdso_data
->dcache_line_size
= ppc64_caches
.dline_size
;
761 vdso_data
->icache_size
= ppc64_caches
.isize
;
762 vdso_data
->icache_line_size
= ppc64_caches
.iline_size
;
764 /* XXXOJN: Blocks should be added to ppc64_caches and used instead */
765 vdso_data
->dcache_block_size
= ppc64_caches
.dline_size
;
766 vdso_data
->icache_block_size
= ppc64_caches
.iline_size
;
767 vdso_data
->dcache_log_block_size
= ppc64_caches
.log_dline_size
;
768 vdso_data
->icache_log_block_size
= ppc64_caches
.log_iline_size
;
771 * Calculate the size of the 64 bits vDSO
773 vdso64_pages
= (&vdso64_end
- &vdso64_start
) >> PAGE_SHIFT
;
774 DBG("vdso64_kbase: %p, 0x%x pages\n", vdso64_kbase
, vdso64_pages
);
776 vdso_data
->dcache_block_size
= L1_CACHE_BYTES
;
777 vdso_data
->dcache_log_block_size
= L1_CACHE_SHIFT
;
778 vdso_data
->icache_block_size
= L1_CACHE_BYTES
;
779 vdso_data
->icache_log_block_size
= L1_CACHE_SHIFT
;
780 #endif /* CONFIG_PPC64 */
784 * Calculate the size of the 32 bits vDSO
786 vdso32_pages
= (&vdso32_end
- &vdso32_start
) >> PAGE_SHIFT
;
787 DBG("vdso32_kbase: %p, 0x%x pages\n", vdso32_kbase
, vdso32_pages
);
791 * Setup the syscall map in the vDOS
793 vdso_setup_syscall_map();
796 * Initialize the vDSO images in memory, that is do necessary
797 * fixups of vDSO symbols, locate trampolines, etc...
800 printk(KERN_ERR
"vDSO setup failure, not enabled !\n");
808 /* Make sure pages are in the correct state */
809 vdso32_pagelist
= kzalloc(sizeof(struct page
*) * (vdso32_pages
+ 2),
811 BUG_ON(vdso32_pagelist
== NULL
);
812 for (i
= 0; i
< vdso32_pages
; i
++) {
813 struct page
*pg
= virt_to_page(vdso32_kbase
+ i
*PAGE_SIZE
);
814 ClearPageReserved(pg
);
816 vdso32_pagelist
[i
] = pg
;
818 vdso32_pagelist
[i
++] = virt_to_page(vdso_data
);
819 vdso32_pagelist
[i
] = NULL
;
822 vdso64_pagelist
= kzalloc(sizeof(struct page
*) * (vdso64_pages
+ 2),
824 BUG_ON(vdso64_pagelist
== NULL
);
825 for (i
= 0; i
< vdso64_pages
; i
++) {
826 struct page
*pg
= virt_to_page(vdso64_kbase
+ i
*PAGE_SIZE
);
827 ClearPageReserved(pg
);
829 vdso64_pagelist
[i
] = pg
;
831 vdso64_pagelist
[i
++] = virt_to_page(vdso_data
);
832 vdso64_pagelist
[i
] = NULL
;
833 #endif /* CONFIG_PPC64 */
835 get_page(virt_to_page(vdso_data
));
842 arch_initcall(vdso_init
);
844 int in_gate_area_no_mm(unsigned long addr
)
849 int in_gate_area(struct mm_struct
*mm
, unsigned long addr
)
854 struct vm_area_struct
*get_gate_vma(struct mm_struct
*mm
)