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/*
* Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
* Copyright 2003 PathScale, Inc.
* Licensed under the GPL
*/
#include "linux/stddef.h"
#include "linux/kernel.h"
#include "linux/sched.h"
#include "linux/mm.h"
#include "asm/page.h"
#include "asm/pgtable.h"
#include "asm/uaccess.h"
#include "asm/tlbflush.h"
#include "user_util.h"
#include "mem_user.h"
#include "os.h"
#include "tlb.h"
static void do_ops(union mm_context *mmu, struct host_vm_op *ops, int last)
{
struct host_vm_op *op;
int i;
for(i = 0; i <= last; i++){
op = &ops[i];
switch(op->type){
case MMAP:
os_map_memory((void *) op->u.mmap.addr, op->u.mmap.fd,
op->u.mmap.offset, op->u.mmap.len,
op->u.mmap.r, op->u.mmap.w,
op->u.mmap.x);
break;
case MUNMAP:
os_unmap_memory((void *) op->u.munmap.addr,
op->u.munmap.len);
break;
case MPROTECT:
protect_memory(op->u.mprotect.addr, op->u.munmap.len,
op->u.mprotect.r, op->u.mprotect.w,
op->u.mprotect.x, 1);
break;
default:
printk("Unknown op type %d in do_ops\n", op->type);
break;
}
}
}
static void fix_range(struct mm_struct *mm, unsigned long start_addr,
unsigned long end_addr, int force)
{
if((current->thread.mode.tt.extern_pid != -1) &&
(current->thread.mode.tt.extern_pid != os_getpid()))
panic("fix_range fixing wrong address space, current = 0x%p",
current);
fix_range_common(mm, start_addr, end_addr, force, do_ops);
}
atomic_t vmchange_seq = ATOMIC_INIT(1);
void flush_tlb_kernel_range_tt(unsigned long start, unsigned long end)
{
if(flush_tlb_kernel_range_common(start, end))
atomic_inc(&vmchange_seq);
}
static void protect_vm_page(unsigned long addr, int w, int must_succeed)
{
int err;
err = protect_memory(addr, PAGE_SIZE, 1, w, 1, must_succeed);
if(err == 0) return;
else if((err == -EFAULT) || (err == -ENOMEM)){
flush_tlb_kernel_range(addr, addr + PAGE_SIZE);
protect_vm_page(addr, w, 1);
}
else panic("protect_vm_page : protect failed, errno = %d\n", err);
}
void mprotect_kernel_vm(int w)
{
struct mm_struct *mm;
pgd_t *pgd;
pud_t *pud;
pmd_t *pmd;
pte_t *pte;
unsigned long addr;
mm = &init_mm;
for(addr = start_vm; addr < end_vm;){
pgd = pgd_offset(mm, addr);
pud = pud_offset(pgd, addr);
pmd = pmd_offset(pud, addr);
if(pmd_present(*pmd)){
pte = pte_offset_kernel(pmd, addr);
if(pte_present(*pte)) protect_vm_page(addr, w, 0);
addr += PAGE_SIZE;
}
else addr += PMD_SIZE;
}
}
void flush_tlb_kernel_vm_tt(void)
{
flush_tlb_kernel_range(start_vm, end_vm);
}
void __flush_tlb_one_tt(unsigned long addr)
{
flush_tlb_kernel_range(addr, addr + PAGE_SIZE);
}
void flush_tlb_range_tt(struct vm_area_struct *vma, unsigned long start,
unsigned long end)
{
if(vma->vm_mm != current->mm) return;
/* Assumes that the range start ... end is entirely within
* either process memory or kernel vm
*/
if((start >= start_vm) && (start < end_vm)){
if(flush_tlb_kernel_range_common(start, end))
atomic_inc(&vmchange_seq);
}
else fix_range(vma->vm_mm, start, end, 0);
}
void flush_tlb_mm_tt(struct mm_struct *mm)
{
unsigned long seq;
if(mm != current->mm) return;
fix_range(mm, 0, STACK_TOP, 0);
seq = atomic_read(&vmchange_seq);
if(current->thread.mode.tt.vm_seq == seq)
return;
current->thread.mode.tt.vm_seq = seq;
flush_tlb_kernel_range_common(start_vm, end_vm);
}
void force_flush_all_tt(void)
{
fix_range(current->mm, 0, STACK_TOP, 1);
flush_tlb_kernel_range_common(start_vm, end_vm);
}
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