linux/arch/powerpc/kernel/vdso.c
Linus Torvalds 0195c00244 Disintegrate and delete asm/system.h
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Merge tag 'split-asm_system_h-for-linus-20120328' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-asm_system

Pull "Disintegrate and delete asm/system.h" from David Howells:
 "Here are a bunch of patches to disintegrate asm/system.h into a set of
  separate bits to relieve the problem of circular inclusion
  dependencies.

  I've built all the working defconfigs from all the arches that I can
  and made sure that they don't break.

  The reason for these patches is that I recently encountered a circular
  dependency problem that came about when I produced some patches to
  optimise get_order() by rewriting it to use ilog2().

  This uses bitops - and on the SH arch asm/bitops.h drags in
  asm-generic/get_order.h by a circuituous route involving asm/system.h.

  The main difficulty seems to be asm/system.h.  It holds a number of
  low level bits with no/few dependencies that are commonly used (eg.
  memory barriers) and a number of bits with more dependencies that
  aren't used in many places (eg.  switch_to()).

  These patches break asm/system.h up into the following core pieces:

    (1) asm/barrier.h

        Move memory barriers here.  This already done for MIPS and Alpha.

    (2) asm/switch_to.h

        Move switch_to() and related stuff here.

    (3) asm/exec.h

        Move arch_align_stack() here.  Other process execution related bits
        could perhaps go here from asm/processor.h.

    (4) asm/cmpxchg.h

        Move xchg() and cmpxchg() here as they're full word atomic ops and
        frequently used by atomic_xchg() and atomic_cmpxchg().

    (5) asm/bug.h

        Move die() and related bits.

    (6) asm/auxvec.h

        Move AT_VECTOR_SIZE_ARCH here.

  Other arch headers are created as needed on a per-arch basis."

Fixed up some conflicts from other header file cleanups and moving code
around that has happened in the meantime, so David's testing is somewhat
weakened by that.  We'll find out anything that got broken and fix it..

* tag 'split-asm_system_h-for-linus-20120328' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-asm_system: (38 commits)
  Delete all instances of asm/system.h
  Remove all #inclusions of asm/system.h
  Add #includes needed to permit the removal of asm/system.h
  Move all declarations of free_initmem() to linux/mm.h
  Disintegrate asm/system.h for OpenRISC
  Split arch_align_stack() out from asm-generic/system.h
  Split the switch_to() wrapper out of asm-generic/system.h
  Move the asm-generic/system.h xchg() implementation to asm-generic/cmpxchg.h
  Create asm-generic/barrier.h
  Make asm-generic/cmpxchg.h #include asm-generic/cmpxchg-local.h
  Disintegrate asm/system.h for Xtensa
  Disintegrate asm/system.h for Unicore32 [based on ver #3, changed by gxt]
  Disintegrate asm/system.h for Tile
  Disintegrate asm/system.h for Sparc
  Disintegrate asm/system.h for SH
  Disintegrate asm/system.h for Score
  Disintegrate asm/system.h for S390
  Disintegrate asm/system.h for PowerPC
  Disintegrate asm/system.h for PA-RISC
  Disintegrate asm/system.h for MN10300
  ...
2012-03-28 15:58:21 -07:00

830 lines
21 KiB
C

/*
* Copyright (C) 2004 Benjamin Herrenschmidt, IBM Corp.
* <benh@kernel.crashing.org>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/stddef.h>
#include <linux/unistd.h>
#include <linux/slab.h>
#include <linux/user.h>
#include <linux/elf.h>
#include <linux/security.h>
#include <linux/bootmem.h>
#include <linux/memblock.h>
#include <asm/pgtable.h>
#include <asm/processor.h>
#include <asm/mmu.h>
#include <asm/mmu_context.h>
#include <asm/prom.h>
#include <asm/machdep.h>
#include <asm/cputable.h>
#include <asm/sections.h>
#include <asm/firmware.h>
#include <asm/vdso.h>
#include <asm/vdso_datapage.h>
#include "setup.h"
#undef DEBUG
#ifdef DEBUG
#define DBG(fmt...) printk(fmt)
#else
#define DBG(fmt...)
#endif
/* Max supported size for symbol names */
#define MAX_SYMNAME 64
/* The alignment of the vDSO */
#define VDSO_ALIGNMENT (1 << 16)
extern char vdso32_start, vdso32_end;
static void *vdso32_kbase = &vdso32_start;
static unsigned int vdso32_pages;
static struct page **vdso32_pagelist;
unsigned long vdso32_sigtramp;
unsigned long vdso32_rt_sigtramp;
#ifdef CONFIG_PPC64
extern char vdso64_start, vdso64_end;
static void *vdso64_kbase = &vdso64_start;
static unsigned int vdso64_pages;
static struct page **vdso64_pagelist;
unsigned long vdso64_rt_sigtramp;
#endif /* CONFIG_PPC64 */
static int vdso_ready;
/*
* The vdso data page (aka. systemcfg for old ppc64 fans) is here.
* Once the early boot kernel code no longer needs to muck around
* with it, it will become dynamically allocated
*/
static union {
struct vdso_data data;
u8 page[PAGE_SIZE];
} vdso_data_store __page_aligned_data;
struct vdso_data *vdso_data = &vdso_data_store.data;
/* Format of the patch table */
struct vdso_patch_def
{
unsigned long ftr_mask, ftr_value;
const char *gen_name;
const char *fix_name;
};
/* Table of functions to patch based on the CPU type/revision
*
* Currently, we only change sync_dicache to do nothing on processors
* with a coherent icache
*/
static struct vdso_patch_def vdso_patches[] = {
{
CPU_FTR_COHERENT_ICACHE, CPU_FTR_COHERENT_ICACHE,
"__kernel_sync_dicache", "__kernel_sync_dicache_p5"
},
{
CPU_FTR_USE_TB, 0,
"__kernel_gettimeofday", NULL
},
{
CPU_FTR_USE_TB, 0,
"__kernel_clock_gettime", NULL
},
{
CPU_FTR_USE_TB, 0,
"__kernel_clock_getres", NULL
},
{
CPU_FTR_USE_TB, 0,
"__kernel_get_tbfreq", NULL
},
};
/*
* Some infos carried around for each of them during parsing at
* boot time.
*/
struct lib32_elfinfo
{
Elf32_Ehdr *hdr; /* ptr to ELF */
Elf32_Sym *dynsym; /* ptr to .dynsym section */
unsigned long dynsymsize; /* size of .dynsym section */
char *dynstr; /* ptr to .dynstr section */
unsigned long text; /* offset of .text section in .so */
};
struct lib64_elfinfo
{
Elf64_Ehdr *hdr;
Elf64_Sym *dynsym;
unsigned long dynsymsize;
char *dynstr;
unsigned long text;
};
#ifdef __DEBUG
static void dump_one_vdso_page(struct page *pg, struct page *upg)
{
printk("kpg: %p (c:%d,f:%08lx)", __va(page_to_pfn(pg) << PAGE_SHIFT),
page_count(pg),
pg->flags);
if (upg && !IS_ERR(upg) /* && pg != upg*/) {
printk(" upg: %p (c:%d,f:%08lx)", __va(page_to_pfn(upg)
<< PAGE_SHIFT),
page_count(upg),
upg->flags);
}
printk("\n");
}
static void dump_vdso_pages(struct vm_area_struct * vma)
{
int i;
if (!vma || is_32bit_task()) {
printk("vDSO32 @ %016lx:\n", (unsigned long)vdso32_kbase);
for (i=0; i<vdso32_pages; i++) {
struct page *pg = virt_to_page(vdso32_kbase +
i*PAGE_SIZE);
struct page *upg = (vma && vma->vm_mm) ?
follow_page(vma, vma->vm_start + i*PAGE_SIZE, 0)
: NULL;
dump_one_vdso_page(pg, upg);
}
}
if (!vma || !is_32bit_task()) {
printk("vDSO64 @ %016lx:\n", (unsigned long)vdso64_kbase);
for (i=0; i<vdso64_pages; i++) {
struct page *pg = virt_to_page(vdso64_kbase +
i*PAGE_SIZE);
struct page *upg = (vma && vma->vm_mm) ?
follow_page(vma, vma->vm_start + i*PAGE_SIZE, 0)
: NULL;
dump_one_vdso_page(pg, upg);
}
}
}
#endif /* DEBUG */
/*
* This is called from binfmt_elf, we create the special vma for the
* vDSO and insert it into the mm struct tree
*/
int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
{
struct mm_struct *mm = current->mm;
struct page **vdso_pagelist;
unsigned long vdso_pages;
unsigned long vdso_base;
int rc;
if (!vdso_ready)
return 0;
#ifdef CONFIG_PPC64
if (is_32bit_task()) {
vdso_pagelist = vdso32_pagelist;
vdso_pages = vdso32_pages;
vdso_base = VDSO32_MBASE;
} else {
vdso_pagelist = vdso64_pagelist;
vdso_pages = vdso64_pages;
/*
* On 64bit we don't have a preferred map address. This
* allows get_unmapped_area to find an area near other mmaps
* and most likely share a SLB entry.
*/
vdso_base = 0;
}
#else
vdso_pagelist = vdso32_pagelist;
vdso_pages = vdso32_pages;
vdso_base = VDSO32_MBASE;
#endif
current->mm->context.vdso_base = 0;
/* vDSO has a problem and was disabled, just don't "enable" it for the
* process
*/
if (vdso_pages == 0)
return 0;
/* Add a page to the vdso size for the data page */
vdso_pages ++;
/*
* pick a base address for the vDSO in process space. We try to put it
* at vdso_base which is the "natural" base for it, but we might fail
* and end up putting it elsewhere.
* Add enough to the size so that the result can be aligned.
*/
down_write(&mm->mmap_sem);
vdso_base = get_unmapped_area(NULL, vdso_base,
(vdso_pages << PAGE_SHIFT) +
((VDSO_ALIGNMENT - 1) & PAGE_MASK),
0, 0);
if (IS_ERR_VALUE(vdso_base)) {
rc = vdso_base;
goto fail_mmapsem;
}
/* Add required alignment. */
vdso_base = ALIGN(vdso_base, VDSO_ALIGNMENT);
/*
* Put vDSO base into mm struct. We need to do this before calling
* install_special_mapping or the perf counter mmap tracking code
* will fail to recognise it as a vDSO (since arch_vma_name fails).
*/
current->mm->context.vdso_base = vdso_base;
/*
* our vma flags don't have VM_WRITE so by default, the process isn't
* allowed to write those pages.
* gdb can break that with ptrace interface, and thus trigger COW on
* those pages but it's then your responsibility to never do that on
* the "data" page of the vDSO or you'll stop getting kernel updates
* and your nice userland gettimeofday will be totally dead.
* It's fine to use that for setting breakpoints in the vDSO code
* pages though.
*/
rc = install_special_mapping(mm, vdso_base, vdso_pages << PAGE_SHIFT,
VM_READ|VM_EXEC|
VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC,
vdso_pagelist);
if (rc) {
current->mm->context.vdso_base = 0;
goto fail_mmapsem;
}
up_write(&mm->mmap_sem);
return 0;
fail_mmapsem:
up_write(&mm->mmap_sem);
return rc;
}
const char *arch_vma_name(struct vm_area_struct *vma)
{
if (vma->vm_mm && vma->vm_start == vma->vm_mm->context.vdso_base)
return "[vdso]";
return NULL;
}
static void * __init find_section32(Elf32_Ehdr *ehdr, const char *secname,
unsigned long *size)
{
Elf32_Shdr *sechdrs;
unsigned int i;
char *secnames;
/* Grab section headers and strings so we can tell who is who */
sechdrs = (void *)ehdr + ehdr->e_shoff;
secnames = (void *)ehdr + sechdrs[ehdr->e_shstrndx].sh_offset;
/* Find the section they want */
for (i = 1; i < ehdr->e_shnum; i++) {
if (strcmp(secnames+sechdrs[i].sh_name, secname) == 0) {
if (size)
*size = sechdrs[i].sh_size;
return (void *)ehdr + sechdrs[i].sh_offset;
}
}
*size = 0;
return NULL;
}
static Elf32_Sym * __init find_symbol32(struct lib32_elfinfo *lib,
const char *symname)
{
unsigned int i;
char name[MAX_SYMNAME], *c;
for (i = 0; i < (lib->dynsymsize / sizeof(Elf32_Sym)); i++) {
if (lib->dynsym[i].st_name == 0)
continue;
strlcpy(name, lib->dynstr + lib->dynsym[i].st_name,
MAX_SYMNAME);
c = strchr(name, '@');
if (c)
*c = 0;
if (strcmp(symname, name) == 0)
return &lib->dynsym[i];
}
return NULL;
}
/* Note that we assume the section is .text and the symbol is relative to
* the library base
*/
static unsigned long __init find_function32(struct lib32_elfinfo *lib,
const char *symname)
{
Elf32_Sym *sym = find_symbol32(lib, symname);
if (sym == NULL) {
printk(KERN_WARNING "vDSO32: function %s not found !\n",
symname);
return 0;
}
return sym->st_value - VDSO32_LBASE;
}
static int __init vdso_do_func_patch32(struct lib32_elfinfo *v32,
struct lib64_elfinfo *v64,
const char *orig, const char *fix)
{
Elf32_Sym *sym32_gen, *sym32_fix;
sym32_gen = find_symbol32(v32, orig);
if (sym32_gen == NULL) {
printk(KERN_ERR "vDSO32: Can't find symbol %s !\n", orig);
return -1;
}
if (fix == NULL) {
sym32_gen->st_name = 0;
return 0;
}
sym32_fix = find_symbol32(v32, fix);
if (sym32_fix == NULL) {
printk(KERN_ERR "vDSO32: Can't find symbol %s !\n", fix);
return -1;
}
sym32_gen->st_value = sym32_fix->st_value;
sym32_gen->st_size = sym32_fix->st_size;
sym32_gen->st_info = sym32_fix->st_info;
sym32_gen->st_other = sym32_fix->st_other;
sym32_gen->st_shndx = sym32_fix->st_shndx;
return 0;
}
#ifdef CONFIG_PPC64
static void * __init find_section64(Elf64_Ehdr *ehdr, const char *secname,
unsigned long *size)
{
Elf64_Shdr *sechdrs;
unsigned int i;
char *secnames;
/* Grab section headers and strings so we can tell who is who */
sechdrs = (void *)ehdr + ehdr->e_shoff;
secnames = (void *)ehdr + sechdrs[ehdr->e_shstrndx].sh_offset;
/* Find the section they want */
for (i = 1; i < ehdr->e_shnum; i++) {
if (strcmp(secnames+sechdrs[i].sh_name, secname) == 0) {
if (size)
*size = sechdrs[i].sh_size;
return (void *)ehdr + sechdrs[i].sh_offset;
}
}
if (size)
*size = 0;
return NULL;
}
static Elf64_Sym * __init find_symbol64(struct lib64_elfinfo *lib,
const char *symname)
{
unsigned int i;
char name[MAX_SYMNAME], *c;
for (i = 0; i < (lib->dynsymsize / sizeof(Elf64_Sym)); i++) {
if (lib->dynsym[i].st_name == 0)
continue;
strlcpy(name, lib->dynstr + lib->dynsym[i].st_name,
MAX_SYMNAME);
c = strchr(name, '@');
if (c)
*c = 0;
if (strcmp(symname, name) == 0)
return &lib->dynsym[i];
}
return NULL;
}
/* Note that we assume the section is .text and the symbol is relative to
* the library base
*/
static unsigned long __init find_function64(struct lib64_elfinfo *lib,
const char *symname)
{
Elf64_Sym *sym = find_symbol64(lib, symname);
if (sym == NULL) {
printk(KERN_WARNING "vDSO64: function %s not found !\n",
symname);
return 0;
}
#ifdef VDS64_HAS_DESCRIPTORS
return *((u64 *)(vdso64_kbase + sym->st_value - VDSO64_LBASE)) -
VDSO64_LBASE;
#else
return sym->st_value - VDSO64_LBASE;
#endif
}
static int __init vdso_do_func_patch64(struct lib32_elfinfo *v32,
struct lib64_elfinfo *v64,
const char *orig, const char *fix)
{
Elf64_Sym *sym64_gen, *sym64_fix;
sym64_gen = find_symbol64(v64, orig);
if (sym64_gen == NULL) {
printk(KERN_ERR "vDSO64: Can't find symbol %s !\n", orig);
return -1;
}
if (fix == NULL) {
sym64_gen->st_name = 0;
return 0;
}
sym64_fix = find_symbol64(v64, fix);
if (sym64_fix == NULL) {
printk(KERN_ERR "vDSO64: Can't find symbol %s !\n", fix);
return -1;
}
sym64_gen->st_value = sym64_fix->st_value;
sym64_gen->st_size = sym64_fix->st_size;
sym64_gen->st_info = sym64_fix->st_info;
sym64_gen->st_other = sym64_fix->st_other;
sym64_gen->st_shndx = sym64_fix->st_shndx;
return 0;
}
#endif /* CONFIG_PPC64 */
static __init int vdso_do_find_sections(struct lib32_elfinfo *v32,
struct lib64_elfinfo *v64)
{
void *sect;
/*
* Locate symbol tables & text section
*/
v32->dynsym = find_section32(v32->hdr, ".dynsym", &v32->dynsymsize);
v32->dynstr = find_section32(v32->hdr, ".dynstr", NULL);
if (v32->dynsym == NULL || v32->dynstr == NULL) {
printk(KERN_ERR "vDSO32: required symbol section not found\n");
return -1;
}
sect = find_section32(v32->hdr, ".text", NULL);
if (sect == NULL) {
printk(KERN_ERR "vDSO32: the .text section was not found\n");
return -1;
}
v32->text = sect - vdso32_kbase;
#ifdef CONFIG_PPC64
v64->dynsym = find_section64(v64->hdr, ".dynsym", &v64->dynsymsize);
v64->dynstr = find_section64(v64->hdr, ".dynstr", NULL);
if (v64->dynsym == NULL || v64->dynstr == NULL) {
printk(KERN_ERR "vDSO64: required symbol section not found\n");
return -1;
}
sect = find_section64(v64->hdr, ".text", NULL);
if (sect == NULL) {
printk(KERN_ERR "vDSO64: the .text section was not found\n");
return -1;
}
v64->text = sect - vdso64_kbase;
#endif /* CONFIG_PPC64 */
return 0;
}
static __init void vdso_setup_trampolines(struct lib32_elfinfo *v32,
struct lib64_elfinfo *v64)
{
/*
* Find signal trampolines
*/
#ifdef CONFIG_PPC64
vdso64_rt_sigtramp = find_function64(v64, "__kernel_sigtramp_rt64");
#endif
vdso32_sigtramp = find_function32(v32, "__kernel_sigtramp32");
vdso32_rt_sigtramp = find_function32(v32, "__kernel_sigtramp_rt32");
}
static __init int vdso_fixup_datapage(struct lib32_elfinfo *v32,
struct lib64_elfinfo *v64)
{
Elf32_Sym *sym32;
#ifdef CONFIG_PPC64
Elf64_Sym *sym64;
sym64 = find_symbol64(v64, "__kernel_datapage_offset");
if (sym64 == NULL) {
printk(KERN_ERR "vDSO64: Can't find symbol "
"__kernel_datapage_offset !\n");
return -1;
}
*((int *)(vdso64_kbase + sym64->st_value - VDSO64_LBASE)) =
(vdso64_pages << PAGE_SHIFT) -
(sym64->st_value - VDSO64_LBASE);
#endif /* CONFIG_PPC64 */
sym32 = find_symbol32(v32, "__kernel_datapage_offset");
if (sym32 == NULL) {
printk(KERN_ERR "vDSO32: Can't find symbol "
"__kernel_datapage_offset !\n");
return -1;
}
*((int *)(vdso32_kbase + (sym32->st_value - VDSO32_LBASE))) =
(vdso32_pages << PAGE_SHIFT) -
(sym32->st_value - VDSO32_LBASE);
return 0;
}
static __init int vdso_fixup_features(struct lib32_elfinfo *v32,
struct lib64_elfinfo *v64)
{
void *start32;
unsigned long size32;
#ifdef CONFIG_PPC64
void *start64;
unsigned long size64;
start64 = find_section64(v64->hdr, "__ftr_fixup", &size64);
if (start64)
do_feature_fixups(cur_cpu_spec->cpu_features,
start64, start64 + size64);
start64 = find_section64(v64->hdr, "__mmu_ftr_fixup", &size64);
if (start64)
do_feature_fixups(cur_cpu_spec->mmu_features,
start64, start64 + size64);
start64 = find_section64(v64->hdr, "__fw_ftr_fixup", &size64);
if (start64)
do_feature_fixups(powerpc_firmware_features,
start64, start64 + size64);
start64 = find_section64(v64->hdr, "__lwsync_fixup", &size64);
if (start64)
do_lwsync_fixups(cur_cpu_spec->cpu_features,
start64, start64 + size64);
#endif /* CONFIG_PPC64 */
start32 = find_section32(v32->hdr, "__ftr_fixup", &size32);
if (start32)
do_feature_fixups(cur_cpu_spec->cpu_features,
start32, start32 + size32);
start32 = find_section32(v32->hdr, "__mmu_ftr_fixup", &size32);
if (start32)
do_feature_fixups(cur_cpu_spec->mmu_features,
start32, start32 + size32);
#ifdef CONFIG_PPC64
start32 = find_section32(v32->hdr, "__fw_ftr_fixup", &size32);
if (start32)
do_feature_fixups(powerpc_firmware_features,
start32, start32 + size32);
#endif /* CONFIG_PPC64 */
start32 = find_section32(v32->hdr, "__lwsync_fixup", &size32);
if (start32)
do_lwsync_fixups(cur_cpu_spec->cpu_features,
start32, start32 + size32);
return 0;
}
static __init int vdso_fixup_alt_funcs(struct lib32_elfinfo *v32,
struct lib64_elfinfo *v64)
{
int i;
for (i = 0; i < ARRAY_SIZE(vdso_patches); i++) {
struct vdso_patch_def *patch = &vdso_patches[i];
int match = (cur_cpu_spec->cpu_features & patch->ftr_mask)
== patch->ftr_value;
if (!match)
continue;
DBG("replacing %s with %s...\n", patch->gen_name,
patch->fix_name ? "NONE" : patch->fix_name);
/*
* Patch the 32 bits and 64 bits symbols. Note that we do not
* patch the "." symbol on 64 bits.
* It would be easy to do, but doesn't seem to be necessary,
* patching the OPD symbol is enough.
*/
vdso_do_func_patch32(v32, v64, patch->gen_name,
patch->fix_name);
#ifdef CONFIG_PPC64
vdso_do_func_patch64(v32, v64, patch->gen_name,
patch->fix_name);
#endif /* CONFIG_PPC64 */
}
return 0;
}
static __init int vdso_setup(void)
{
struct lib32_elfinfo v32;
struct lib64_elfinfo v64;
v32.hdr = vdso32_kbase;
#ifdef CONFIG_PPC64
v64.hdr = vdso64_kbase;
#endif
if (vdso_do_find_sections(&v32, &v64))
return -1;
if (vdso_fixup_datapage(&v32, &v64))
return -1;
if (vdso_fixup_features(&v32, &v64))
return -1;
if (vdso_fixup_alt_funcs(&v32, &v64))
return -1;
vdso_setup_trampolines(&v32, &v64);
return 0;
}
/*
* Called from setup_arch to initialize the bitmap of available
* syscalls in the systemcfg page
*/
static void __init vdso_setup_syscall_map(void)
{
unsigned int i;
extern unsigned long *sys_call_table;
extern unsigned long sys_ni_syscall;
for (i = 0; i < __NR_syscalls; i++) {
#ifdef CONFIG_PPC64
if (sys_call_table[i*2] != sys_ni_syscall)
vdso_data->syscall_map_64[i >> 5] |=
0x80000000UL >> (i & 0x1f);
if (sys_call_table[i*2+1] != sys_ni_syscall)
vdso_data->syscall_map_32[i >> 5] |=
0x80000000UL >> (i & 0x1f);
#else /* CONFIG_PPC64 */
if (sys_call_table[i] != sys_ni_syscall)
vdso_data->syscall_map_32[i >> 5] |=
0x80000000UL >> (i & 0x1f);
#endif /* CONFIG_PPC64 */
}
}
static int __init vdso_init(void)
{
int i;
#ifdef CONFIG_PPC64
/*
* Fill up the "systemcfg" stuff for backward compatibility
*/
strcpy((char *)vdso_data->eye_catcher, "SYSTEMCFG:PPC64");
vdso_data->version.major = SYSTEMCFG_MAJOR;
vdso_data->version.minor = SYSTEMCFG_MINOR;
vdso_data->processor = mfspr(SPRN_PVR);
/*
* Fake the old platform number for pSeries and add
* in LPAR bit if necessary
*/
vdso_data->platform = 0x100;
if (firmware_has_feature(FW_FEATURE_LPAR))
vdso_data->platform |= 1;
vdso_data->physicalMemorySize = memblock_phys_mem_size();
vdso_data->dcache_size = ppc64_caches.dsize;
vdso_data->dcache_line_size = ppc64_caches.dline_size;
vdso_data->icache_size = ppc64_caches.isize;
vdso_data->icache_line_size = ppc64_caches.iline_size;
/* XXXOJN: Blocks should be added to ppc64_caches and used instead */
vdso_data->dcache_block_size = ppc64_caches.dline_size;
vdso_data->icache_block_size = ppc64_caches.iline_size;
vdso_data->dcache_log_block_size = ppc64_caches.log_dline_size;
vdso_data->icache_log_block_size = ppc64_caches.log_iline_size;
/*
* Calculate the size of the 64 bits vDSO
*/
vdso64_pages = (&vdso64_end - &vdso64_start) >> PAGE_SHIFT;
DBG("vdso64_kbase: %p, 0x%x pages\n", vdso64_kbase, vdso64_pages);
#else
vdso_data->dcache_block_size = L1_CACHE_BYTES;
vdso_data->dcache_log_block_size = L1_CACHE_SHIFT;
vdso_data->icache_block_size = L1_CACHE_BYTES;
vdso_data->icache_log_block_size = L1_CACHE_SHIFT;
#endif /* CONFIG_PPC64 */
/*
* Calculate the size of the 32 bits vDSO
*/
vdso32_pages = (&vdso32_end - &vdso32_start) >> PAGE_SHIFT;
DBG("vdso32_kbase: %p, 0x%x pages\n", vdso32_kbase, vdso32_pages);
/*
* Setup the syscall map in the vDOS
*/
vdso_setup_syscall_map();
/*
* Initialize the vDSO images in memory, that is do necessary
* fixups of vDSO symbols, locate trampolines, etc...
*/
if (vdso_setup()) {
printk(KERN_ERR "vDSO setup failure, not enabled !\n");
vdso32_pages = 0;
#ifdef CONFIG_PPC64
vdso64_pages = 0;
#endif
return 0;
}
/* Make sure pages are in the correct state */
vdso32_pagelist = kzalloc(sizeof(struct page *) * (vdso32_pages + 2),
GFP_KERNEL);
BUG_ON(vdso32_pagelist == NULL);
for (i = 0; i < vdso32_pages; i++) {
struct page *pg = virt_to_page(vdso32_kbase + i*PAGE_SIZE);
ClearPageReserved(pg);
get_page(pg);
vdso32_pagelist[i] = pg;
}
vdso32_pagelist[i++] = virt_to_page(vdso_data);
vdso32_pagelist[i] = NULL;
#ifdef CONFIG_PPC64
vdso64_pagelist = kzalloc(sizeof(struct page *) * (vdso64_pages + 2),
GFP_KERNEL);
BUG_ON(vdso64_pagelist == NULL);
for (i = 0; i < vdso64_pages; i++) {
struct page *pg = virt_to_page(vdso64_kbase + i*PAGE_SIZE);
ClearPageReserved(pg);
get_page(pg);
vdso64_pagelist[i] = pg;
}
vdso64_pagelist[i++] = virt_to_page(vdso_data);
vdso64_pagelist[i] = NULL;
#endif /* CONFIG_PPC64 */
get_page(virt_to_page(vdso_data));
smp_wmb();
vdso_ready = 1;
return 0;
}
arch_initcall(vdso_init);
int in_gate_area_no_mm(unsigned long addr)
{
return 0;
}
int in_gate_area(struct mm_struct *mm, unsigned long addr)
{
return 0;
}
struct vm_area_struct *get_gate_vma(struct mm_struct *mm)
{
return NULL;
}