532 lines
12 KiB
C
532 lines
12 KiB
C
/*
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* Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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* Licensed under the GPL
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*/
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#include "linux/mm.h"
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#include "asm/pgtable.h"
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#include "asm/tlbflush.h"
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#include "as-layout.h"
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#include "mem_user.h"
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#include "os.h"
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#include "skas.h"
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#include "tlb.h"
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static int add_mmap(unsigned long virt, unsigned long phys, unsigned long len,
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unsigned int prot, struct host_vm_op *ops, int *index,
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int last_filled, union mm_context *mmu, void **flush,
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int (*do_ops)(union mm_context *, struct host_vm_op *,
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int, int, void **))
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{
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__u64 offset;
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struct host_vm_op *last;
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int fd, ret = 0;
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fd = phys_mapping(phys, &offset);
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if (*index != -1) {
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last = &ops[*index];
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if ((last->type == MMAP) &&
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(last->u.mmap.addr + last->u.mmap.len == virt) &&
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(last->u.mmap.prot == prot) && (last->u.mmap.fd == fd) &&
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(last->u.mmap.offset + last->u.mmap.len == offset)) {
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last->u.mmap.len += len;
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return 0;
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}
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}
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if (*index == last_filled) {
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ret = (*do_ops)(mmu, ops, last_filled, 0, flush);
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*index = -1;
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}
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ops[++*index] = ((struct host_vm_op) { .type = MMAP,
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.u = { .mmap = {
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.addr = virt,
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.len = len,
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.prot = prot,
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.fd = fd,
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.offset = offset }
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} });
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return ret;
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}
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static int add_munmap(unsigned long addr, unsigned long len,
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struct host_vm_op *ops, int *index, int last_filled,
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union mm_context *mmu, void **flush,
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int (*do_ops)(union mm_context *, struct host_vm_op *,
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int, int, void **))
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{
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struct host_vm_op *last;
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int ret = 0;
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if (*index != -1) {
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last = &ops[*index];
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if ((last->type == MUNMAP) &&
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(last->u.munmap.addr + last->u.mmap.len == addr)) {
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last->u.munmap.len += len;
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return 0;
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}
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}
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if (*index == last_filled) {
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ret = (*do_ops)(mmu, ops, last_filled, 0, flush);
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*index = -1;
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}
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ops[++*index] = ((struct host_vm_op) { .type = MUNMAP,
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.u = { .munmap = {
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.addr = addr,
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.len = len } } });
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return ret;
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}
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static int add_mprotect(unsigned long addr, unsigned long len,
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unsigned int prot, struct host_vm_op *ops, int *index,
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int last_filled, union mm_context *mmu, void **flush,
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int (*do_ops)(union mm_context *, struct host_vm_op *,
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int, int, void **))
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{
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struct host_vm_op *last;
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int ret = 0;
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if (*index != -1) {
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last = &ops[*index];
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if ((last->type == MPROTECT) &&
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(last->u.mprotect.addr + last->u.mprotect.len == addr) &&
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(last->u.mprotect.prot == prot)) {
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last->u.mprotect.len += len;
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return 0;
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}
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}
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if (*index == last_filled) {
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ret = (*do_ops)(mmu, ops, last_filled, 0, flush);
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*index = -1;
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}
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ops[++*index] = ((struct host_vm_op) { .type = MPROTECT,
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.u = { .mprotect = {
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.addr = addr,
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.len = len,
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.prot = prot } } });
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return ret;
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}
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#define ADD_ROUND(n, inc) (((n) + (inc)) & ~((inc) - 1))
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static inline int update_pte_range(pmd_t *pmd, unsigned long addr,
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unsigned long end, struct host_vm_op *ops,
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int last_op, int *op_index, int force,
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union mm_context *mmu, void **flush,
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int (*do_ops)(union mm_context *,
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struct host_vm_op *, int, int,
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void **))
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{
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pte_t *pte;
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int r, w, x, prot, ret = 0;
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pte = pte_offset_kernel(pmd, addr);
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do {
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r = pte_read(*pte);
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w = pte_write(*pte);
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x = pte_exec(*pte);
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if (!pte_young(*pte)) {
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r = 0;
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w = 0;
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} else if (!pte_dirty(*pte)) {
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w = 0;
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}
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prot = ((r ? UM_PROT_READ : 0) | (w ? UM_PROT_WRITE : 0) |
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(x ? UM_PROT_EXEC : 0));
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if (force || pte_newpage(*pte)) {
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if (pte_present(*pte))
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ret = add_mmap(addr, pte_val(*pte) & PAGE_MASK,
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PAGE_SIZE, prot, ops, op_index,
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last_op, mmu, flush, do_ops);
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else ret = add_munmap(addr, PAGE_SIZE, ops, op_index,
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last_op, mmu, flush, do_ops);
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}
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else if (pte_newprot(*pte))
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ret = add_mprotect(addr, PAGE_SIZE, prot, ops, op_index,
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last_op, mmu, flush, do_ops);
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*pte = pte_mkuptodate(*pte);
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} while (pte++, addr += PAGE_SIZE, ((addr != end) && !ret));
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return ret;
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}
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static inline int update_pmd_range(pud_t *pud, unsigned long addr,
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unsigned long end, struct host_vm_op *ops,
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int last_op, int *op_index, int force,
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union mm_context *mmu, void **flush,
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int (*do_ops)(union mm_context *,
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struct host_vm_op *, int, int,
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void **))
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{
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pmd_t *pmd;
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unsigned long next;
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int ret = 0;
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pmd = pmd_offset(pud, addr);
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do {
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next = pmd_addr_end(addr, end);
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if (!pmd_present(*pmd)) {
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if (force || pmd_newpage(*pmd)) {
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ret = add_munmap(addr, next - addr, ops,
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op_index, last_op, mmu,
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flush, do_ops);
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pmd_mkuptodate(*pmd);
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}
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}
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else ret = update_pte_range(pmd, addr, next, ops, last_op,
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op_index, force, mmu, flush,
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do_ops);
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} while (pmd++, addr = next, ((addr != end) && !ret));
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return ret;
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}
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static inline int update_pud_range(pgd_t *pgd, unsigned long addr,
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unsigned long end, struct host_vm_op *ops,
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int last_op, int *op_index, int force,
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union mm_context *mmu, void **flush,
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int (*do_ops)(union mm_context *,
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struct host_vm_op *, int, int,
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void **))
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{
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pud_t *pud;
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unsigned long next;
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int ret = 0;
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pud = pud_offset(pgd, addr);
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do {
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next = pud_addr_end(addr, end);
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if (!pud_present(*pud)) {
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if (force || pud_newpage(*pud)) {
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ret = add_munmap(addr, next - addr, ops,
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op_index, last_op, mmu,
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flush, do_ops);
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pud_mkuptodate(*pud);
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}
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}
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else ret = update_pmd_range(pud, addr, next, ops, last_op,
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op_index, force, mmu, flush,
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do_ops);
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} while (pud++, addr = next, ((addr != end) && !ret));
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return ret;
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}
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void fix_range_common(struct mm_struct *mm, unsigned long start_addr,
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unsigned long end_addr, int force,
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int (*do_ops)(union mm_context *, struct host_vm_op *,
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int, int, void **))
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{
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pgd_t *pgd;
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union mm_context *mmu = &mm->context;
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struct host_vm_op ops[1];
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unsigned long addr = start_addr, next;
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int ret = 0, last_op = ARRAY_SIZE(ops) - 1, op_index = -1;
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void *flush = NULL;
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ops[0].type = NONE;
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pgd = pgd_offset(mm, addr);
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do {
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next = pgd_addr_end(addr, end_addr);
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if (!pgd_present(*pgd)) {
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if (force || pgd_newpage(*pgd)) {
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ret = add_munmap(addr, next - addr, ops,
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&op_index, last_op, mmu,
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&flush, do_ops);
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pgd_mkuptodate(*pgd);
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}
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}
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else ret = update_pud_range(pgd, addr, next, ops, last_op,
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&op_index, force, mmu, &flush,
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do_ops);
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} while (pgd++, addr = next, ((addr != end_addr) && !ret));
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if (!ret)
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ret = (*do_ops)(mmu, ops, op_index, 1, &flush);
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/* This is not an else because ret is modified above */
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if (ret) {
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printk(KERN_ERR "fix_range_common: failed, killing current "
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"process\n");
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force_sig(SIGKILL, current);
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}
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}
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int flush_tlb_kernel_range_common(unsigned long start, unsigned long end)
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{
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struct mm_struct *mm;
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pgd_t *pgd;
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pud_t *pud;
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pmd_t *pmd;
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pte_t *pte;
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unsigned long addr, last;
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int updated = 0, err;
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mm = &init_mm;
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for (addr = start; addr < end;) {
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pgd = pgd_offset(mm, addr);
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if (!pgd_present(*pgd)) {
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last = ADD_ROUND(addr, PGDIR_SIZE);
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if (last > end)
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last = end;
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if (pgd_newpage(*pgd)) {
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updated = 1;
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err = os_unmap_memory((void *) addr,
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last - addr);
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if (err < 0)
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panic("munmap failed, errno = %d\n",
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-err);
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}
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addr = last;
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continue;
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}
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pud = pud_offset(pgd, addr);
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if (!pud_present(*pud)) {
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last = ADD_ROUND(addr, PUD_SIZE);
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if (last > end)
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last = end;
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if (pud_newpage(*pud)) {
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updated = 1;
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err = os_unmap_memory((void *) addr,
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last - addr);
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if (err < 0)
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panic("munmap failed, errno = %d\n",
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-err);
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}
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addr = last;
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continue;
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}
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pmd = pmd_offset(pud, addr);
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if (!pmd_present(*pmd)) {
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last = ADD_ROUND(addr, PMD_SIZE);
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if (last > end)
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last = end;
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if (pmd_newpage(*pmd)) {
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updated = 1;
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err = os_unmap_memory((void *) addr,
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last - addr);
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if (err < 0)
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panic("munmap failed, errno = %d\n",
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-err);
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}
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addr = last;
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continue;
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}
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pte = pte_offset_kernel(pmd, addr);
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if (!pte_present(*pte) || pte_newpage(*pte)) {
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updated = 1;
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err = os_unmap_memory((void *) addr,
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PAGE_SIZE);
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if (err < 0)
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panic("munmap failed, errno = %d\n",
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-err);
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if (pte_present(*pte))
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map_memory(addr,
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pte_val(*pte) & PAGE_MASK,
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PAGE_SIZE, 1, 1, 1);
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}
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else if (pte_newprot(*pte)) {
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updated = 1;
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os_protect_memory((void *) addr, PAGE_SIZE, 1, 1, 1);
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}
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addr += PAGE_SIZE;
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}
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return updated;
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}
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void flush_tlb_page(struct vm_area_struct *vma, unsigned long address)
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{
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pgd_t *pgd;
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pud_t *pud;
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pmd_t *pmd;
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pte_t *pte;
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struct mm_struct *mm = vma->vm_mm;
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void *flush = NULL;
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int r, w, x, prot, err = 0;
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struct mm_id *mm_id;
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address &= PAGE_MASK;
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pgd = pgd_offset(mm, address);
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if (!pgd_present(*pgd))
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goto kill;
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pud = pud_offset(pgd, address);
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if (!pud_present(*pud))
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goto kill;
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pmd = pmd_offset(pud, address);
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if (!pmd_present(*pmd))
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goto kill;
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pte = pte_offset_kernel(pmd, address);
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r = pte_read(*pte);
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w = pte_write(*pte);
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x = pte_exec(*pte);
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if (!pte_young(*pte)) {
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r = 0;
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w = 0;
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} else if (!pte_dirty(*pte)) {
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w = 0;
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}
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mm_id = &mm->context.skas.id;
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prot = ((r ? UM_PROT_READ : 0) | (w ? UM_PROT_WRITE : 0) |
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(x ? UM_PROT_EXEC : 0));
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if (pte_newpage(*pte)) {
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if (pte_present(*pte)) {
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unsigned long long offset;
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int fd;
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fd = phys_mapping(pte_val(*pte) & PAGE_MASK, &offset);
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err = map(mm_id, address, PAGE_SIZE, prot, fd, offset,
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1, &flush);
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}
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else err = unmap(mm_id, address, PAGE_SIZE, 1, &flush);
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}
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else if (pte_newprot(*pte))
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err = protect(mm_id, address, PAGE_SIZE, prot, 1, &flush);
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if (err)
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goto kill;
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*pte = pte_mkuptodate(*pte);
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return;
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kill:
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printk(KERN_ERR "Failed to flush page for address 0x%lx\n", address);
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force_sig(SIGKILL, current);
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}
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pgd_t *pgd_offset_proc(struct mm_struct *mm, unsigned long address)
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{
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return pgd_offset(mm, address);
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}
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pud_t *pud_offset_proc(pgd_t *pgd, unsigned long address)
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{
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return pud_offset(pgd, address);
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}
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pmd_t *pmd_offset_proc(pud_t *pud, unsigned long address)
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{
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return pmd_offset(pud, address);
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}
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pte_t *pte_offset_proc(pmd_t *pmd, unsigned long address)
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{
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return pte_offset_kernel(pmd, address);
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}
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pte_t *addr_pte(struct task_struct *task, unsigned long addr)
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{
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pgd_t *pgd = pgd_offset(task->mm, addr);
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pud_t *pud = pud_offset(pgd, addr);
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pmd_t *pmd = pmd_offset(pud, addr);
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return pte_offset_map(pmd, addr);
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}
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void flush_tlb_all(void)
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{
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flush_tlb_mm(current->mm);
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}
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void flush_tlb_kernel_range(unsigned long start, unsigned long end)
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{
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flush_tlb_kernel_range_common(start, end);
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}
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void flush_tlb_kernel_vm(void)
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{
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flush_tlb_kernel_range_common(start_vm, end_vm);
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}
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void __flush_tlb_one(unsigned long addr)
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{
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flush_tlb_kernel_range_common(addr, addr + PAGE_SIZE);
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}
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static int do_ops(union mm_context *mmu, struct host_vm_op *ops, int last,
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int finished, void **flush)
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{
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struct host_vm_op *op;
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int i, ret = 0;
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for (i = 0; i <= last && !ret; i++) {
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op = &ops[i];
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switch(op->type) {
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case MMAP:
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ret = map(&mmu->skas.id, op->u.mmap.addr,
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op->u.mmap.len, op->u.mmap.prot,
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op->u.mmap.fd, op->u.mmap.offset, finished,
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flush);
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break;
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case MUNMAP:
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ret = unmap(&mmu->skas.id, op->u.munmap.addr,
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op->u.munmap.len, finished, flush);
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break;
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case MPROTECT:
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ret = protect(&mmu->skas.id, op->u.mprotect.addr,
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op->u.mprotect.len, op->u.mprotect.prot,
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finished, flush);
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break;
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default:
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printk(KERN_ERR "Unknown op type %d in do_ops\n",
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op->type);
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break;
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}
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}
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return ret;
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}
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static void fix_range(struct mm_struct *mm, unsigned long start_addr,
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unsigned long end_addr, int force)
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{
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if (!proc_mm && (end_addr > CONFIG_STUB_START))
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end_addr = CONFIG_STUB_START;
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fix_range_common(mm, start_addr, end_addr, force, do_ops);
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}
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void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
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unsigned long end)
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{
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if (vma->vm_mm == NULL)
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flush_tlb_kernel_range_common(start, end);
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else fix_range(vma->vm_mm, start, end, 0);
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}
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void flush_tlb_mm(struct mm_struct *mm)
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{
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unsigned long end;
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/*
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* Don't bother flushing if this address space is about to be
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* destroyed.
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*/
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if (atomic_read(&mm->mm_users) == 0)
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return;
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end = proc_mm ? task_size : CONFIG_STUB_START;
|
|
fix_range(mm, 0, end, 0);
|
|
}
|
|
|
|
void force_flush_all(void)
|
|
{
|
|
struct mm_struct *mm = current->mm;
|
|
struct vm_area_struct *vma = mm->mmap;
|
|
|
|
while (vma != NULL) {
|
|
fix_range(mm, vma->vm_start, vma->vm_end, 1);
|
|
vma = vma->vm_next;
|
|
}
|
|
}
|