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linux-next/arch/um/kernel/tlb.c
Jeff Dike 6aa802ce6a uml: throw out CHOOSE_MODE
The next stage after removing code which depends on CONFIG_MODE_TT is removing
the CHOOSE_MODE abstraction, which provided both compile-time and run-time
branching to either tt-mode or skas-mode code.

This patch removes choose-mode.h and all inclusions of it, and replaces all
CHOOSE_MODE invocations with the skas branch.  This leaves a number of trivial
functions which will be dealt with in a later patch.

There are some changes in the uaccess and tls support which go somewhat beyond
this and eliminate some of the now-redundant functions.

Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-16 09:43:05 -07:00

408 lines
9.7 KiB
C

/*
* Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
* Licensed under the GPL
*/
#include "linux/mm.h"
#include "asm/page.h"
#include "asm/pgalloc.h"
#include "asm/pgtable.h"
#include "asm/tlbflush.h"
#include "mode_kern.h"
#include "as-layout.h"
#include "tlb.h"
#include "mem.h"
#include "mem_user.h"
#include "os.h"
static int add_mmap(unsigned long virt, unsigned long phys, unsigned long len,
unsigned int prot, struct host_vm_op *ops, int *index,
int last_filled, union mm_context *mmu, void **flush,
int (*do_ops)(union mm_context *, struct host_vm_op *,
int, int, void **))
{
__u64 offset;
struct host_vm_op *last;
int fd, ret = 0;
fd = phys_mapping(phys, &offset);
if(*index != -1){
last = &ops[*index];
if((last->type == MMAP) &&
(last->u.mmap.addr + last->u.mmap.len == virt) &&
(last->u.mmap.prot == prot) && (last->u.mmap.fd == fd) &&
(last->u.mmap.offset + last->u.mmap.len == offset)){
last->u.mmap.len += len;
return 0;
}
}
if(*index == last_filled){
ret = (*do_ops)(mmu, ops, last_filled, 0, flush);
*index = -1;
}
ops[++*index] = ((struct host_vm_op) { .type = MMAP,
.u = { .mmap = {
.addr = virt,
.len = len,
.prot = prot,
.fd = fd,
.offset = offset }
} });
return ret;
}
static int add_munmap(unsigned long addr, unsigned long len,
struct host_vm_op *ops, int *index, int last_filled,
union mm_context *mmu, void **flush,
int (*do_ops)(union mm_context *, struct host_vm_op *,
int, int, void **))
{
struct host_vm_op *last;
int ret = 0;
if(*index != -1){
last = &ops[*index];
if((last->type == MUNMAP) &&
(last->u.munmap.addr + last->u.mmap.len == addr)){
last->u.munmap.len += len;
return 0;
}
}
if(*index == last_filled){
ret = (*do_ops)(mmu, ops, last_filled, 0, flush);
*index = -1;
}
ops[++*index] = ((struct host_vm_op) { .type = MUNMAP,
.u = { .munmap = {
.addr = addr,
.len = len } } });
return ret;
}
static int add_mprotect(unsigned long addr, unsigned long len,
unsigned int prot, struct host_vm_op *ops, int *index,
int last_filled, union mm_context *mmu, void **flush,
int (*do_ops)(union mm_context *, struct host_vm_op *,
int, int, void **))
{
struct host_vm_op *last;
int ret = 0;
if(*index != -1){
last = &ops[*index];
if((last->type == MPROTECT) &&
(last->u.mprotect.addr + last->u.mprotect.len == addr) &&
(last->u.mprotect.prot == prot)){
last->u.mprotect.len += len;
return 0;
}
}
if(*index == last_filled){
ret = (*do_ops)(mmu, ops, last_filled, 0, flush);
*index = -1;
}
ops[++*index] = ((struct host_vm_op) { .type = MPROTECT,
.u = { .mprotect = {
.addr = addr,
.len = len,
.prot = prot } } });
return ret;
}
#define ADD_ROUND(n, inc) (((n) + (inc)) & ~((inc) - 1))
static inline int update_pte_range(pmd_t *pmd, unsigned long addr,
unsigned long end, struct host_vm_op *ops,
int last_op, int *op_index, int force,
union mm_context *mmu, void **flush,
int (*do_ops)(union mm_context *,
struct host_vm_op *, int, int,
void **))
{
pte_t *pte;
int r, w, x, prot, ret = 0;
pte = pte_offset_kernel(pmd, addr);
do {
r = pte_read(*pte);
w = pte_write(*pte);
x = pte_exec(*pte);
if (!pte_young(*pte)) {
r = 0;
w = 0;
} else if (!pte_dirty(*pte)) {
w = 0;
}
prot = ((r ? UM_PROT_READ : 0) | (w ? UM_PROT_WRITE : 0) |
(x ? UM_PROT_EXEC : 0));
if(force || pte_newpage(*pte)){
if(pte_present(*pte))
ret = add_mmap(addr, pte_val(*pte) & PAGE_MASK,
PAGE_SIZE, prot, ops, op_index,
last_op, mmu, flush, do_ops);
else ret = add_munmap(addr, PAGE_SIZE, ops, op_index,
last_op, mmu, flush, do_ops);
}
else if(pte_newprot(*pte))
ret = add_mprotect(addr, PAGE_SIZE, prot, ops, op_index,
last_op, mmu, flush, do_ops);
*pte = pte_mkuptodate(*pte);
} while (pte++, addr += PAGE_SIZE, ((addr != end) && !ret));
return ret;
}
static inline int update_pmd_range(pud_t *pud, unsigned long addr,
unsigned long end, struct host_vm_op *ops,
int last_op, int *op_index, int force,
union mm_context *mmu, void **flush,
int (*do_ops)(union mm_context *,
struct host_vm_op *, int, int,
void **))
{
pmd_t *pmd;
unsigned long next;
int ret = 0;
pmd = pmd_offset(pud, addr);
do {
next = pmd_addr_end(addr, end);
if(!pmd_present(*pmd)){
if(force || pmd_newpage(*pmd)){
ret = add_munmap(addr, next - addr, ops,
op_index, last_op, mmu,
flush, do_ops);
pmd_mkuptodate(*pmd);
}
}
else ret = update_pte_range(pmd, addr, next, ops, last_op,
op_index, force, mmu, flush,
do_ops);
} while (pmd++, addr = next, ((addr != end) && !ret));
return ret;
}
static inline int update_pud_range(pgd_t *pgd, unsigned long addr,
unsigned long end, struct host_vm_op *ops,
int last_op, int *op_index, int force,
union mm_context *mmu, void **flush,
int (*do_ops)(union mm_context *,
struct host_vm_op *, int, int,
void **))
{
pud_t *pud;
unsigned long next;
int ret = 0;
pud = pud_offset(pgd, addr);
do {
next = pud_addr_end(addr, end);
if(!pud_present(*pud)){
if(force || pud_newpage(*pud)){
ret = add_munmap(addr, next - addr, ops,
op_index, last_op, mmu,
flush, do_ops);
pud_mkuptodate(*pud);
}
}
else ret = update_pmd_range(pud, addr, next, ops, last_op,
op_index, force, mmu, flush,
do_ops);
} while (pud++, addr = next, ((addr != end) && !ret));
return ret;
}
void fix_range_common(struct mm_struct *mm, unsigned long start_addr,
unsigned long end_addr, int force,
int (*do_ops)(union mm_context *, struct host_vm_op *,
int, int, void **))
{
pgd_t *pgd;
union mm_context *mmu = &mm->context;
struct host_vm_op ops[1];
unsigned long addr = start_addr, next;
int ret = 0, last_op = ARRAY_SIZE(ops) - 1, op_index = -1;
void *flush = NULL;
ops[0].type = NONE;
pgd = pgd_offset(mm, addr);
do {
next = pgd_addr_end(addr, end_addr);
if(!pgd_present(*pgd)){
if (force || pgd_newpage(*pgd)){
ret = add_munmap(addr, next - addr, ops,
&op_index, last_op, mmu,
&flush, do_ops);
pgd_mkuptodate(*pgd);
}
}
else ret = update_pud_range(pgd, addr, next, ops, last_op,
&op_index, force, mmu, &flush,
do_ops);
} while (pgd++, addr = next, ((addr != end_addr) && !ret));
if(!ret)
ret = (*do_ops)(mmu, ops, op_index, 1, &flush);
/* This is not an else because ret is modified above */
if(ret) {
printk("fix_range_common: failed, killing current process\n");
force_sig(SIGKILL, current);
}
}
int flush_tlb_kernel_range_common(unsigned long start, unsigned long end)
{
struct mm_struct *mm;
pgd_t *pgd;
pud_t *pud;
pmd_t *pmd;
pte_t *pte;
unsigned long addr, last;
int updated = 0, err;
mm = &init_mm;
for(addr = start; addr < end;){
pgd = pgd_offset(mm, addr);
if(!pgd_present(*pgd)){
last = ADD_ROUND(addr, PGDIR_SIZE);
if(last > end)
last = end;
if(pgd_newpage(*pgd)){
updated = 1;
err = os_unmap_memory((void *) addr,
last - addr);
if(err < 0)
panic("munmap failed, errno = %d\n",
-err);
}
addr = last;
continue;
}
pud = pud_offset(pgd, addr);
if(!pud_present(*pud)){
last = ADD_ROUND(addr, PUD_SIZE);
if(last > end)
last = end;
if(pud_newpage(*pud)){
updated = 1;
err = os_unmap_memory((void *) addr,
last - addr);
if(err < 0)
panic("munmap failed, errno = %d\n",
-err);
}
addr = last;
continue;
}
pmd = pmd_offset(pud, addr);
if(!pmd_present(*pmd)){
last = ADD_ROUND(addr, PMD_SIZE);
if(last > end)
last = end;
if(pmd_newpage(*pmd)){
updated = 1;
err = os_unmap_memory((void *) addr,
last - addr);
if(err < 0)
panic("munmap failed, errno = %d\n",
-err);
}
addr = last;
continue;
}
pte = pte_offset_kernel(pmd, addr);
if(!pte_present(*pte) || pte_newpage(*pte)){
updated = 1;
err = os_unmap_memory((void *) addr,
PAGE_SIZE);
if(err < 0)
panic("munmap failed, errno = %d\n",
-err);
if(pte_present(*pte))
map_memory(addr,
pte_val(*pte) & PAGE_MASK,
PAGE_SIZE, 1, 1, 1);
}
else if(pte_newprot(*pte)){
updated = 1;
os_protect_memory((void *) addr, PAGE_SIZE, 1, 1, 1);
}
addr += PAGE_SIZE;
}
return(updated);
}
pgd_t *pgd_offset_proc(struct mm_struct *mm, unsigned long address)
{
return(pgd_offset(mm, address));
}
pud_t *pud_offset_proc(pgd_t *pgd, unsigned long address)
{
return(pud_offset(pgd, address));
}
pmd_t *pmd_offset_proc(pud_t *pud, unsigned long address)
{
return(pmd_offset(pud, address));
}
pte_t *pte_offset_proc(pmd_t *pmd, unsigned long address)
{
return(pte_offset_kernel(pmd, address));
}
pte_t *addr_pte(struct task_struct *task, unsigned long addr)
{
pgd_t *pgd = pgd_offset(task->mm, addr);
pud_t *pud = pud_offset(pgd, addr);
pmd_t *pmd = pmd_offset(pud, addr);
return(pte_offset_map(pmd, addr));
}
void flush_tlb_all(void)
{
flush_tlb_mm(current->mm);
}
void flush_tlb_kernel_range(unsigned long start, unsigned long end)
{
flush_tlb_kernel_range_common(start, end);
}
void flush_tlb_kernel_vm(void)
{
flush_tlb_kernel_range_common(start_vm, end_vm);
}
void __flush_tlb_one(unsigned long addr)
{
__flush_tlb_one_skas(addr);
}
void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
unsigned long end)
{
flush_tlb_range_skas(vma, start, end);
}
void flush_tlb_mm(struct mm_struct *mm)
{
flush_tlb_mm_skas(mm);
}
void force_flush_all(void)
{
force_flush_all_skas();
}