[PATCH] uml: kill some useless vmalloc tlb flushing
[linux-2.6.git] / arch / um / kernel / skas / tlb.c
1 /* 
2  * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
3  * Copyright 2003 PathScale, Inc.
4  * Licensed under the GPL
5  */
6
7 #include "linux/stddef.h"
8 #include "linux/sched.h"
9 #include "linux/mm.h"
10 #include "asm/page.h"
11 #include "asm/pgtable.h"
12 #include "asm/mmu.h"
13 #include "user_util.h"
14 #include "mem_user.h"
15 #include "mem.h"
16 #include "skas.h"
17 #include "os.h"
18 #include "tlb.h"
19
20 static void do_ops(int fd, struct host_vm_op *ops, int last)
21 {
22         struct host_vm_op *op;
23         int i;
24
25         for(i = 0; i <= last; i++){
26                 op = &ops[i];
27                 switch(op->type){
28                 case MMAP:
29                         map(fd, op->u.mmap.addr, op->u.mmap.len,
30                             op->u.mmap.r, op->u.mmap.w, op->u.mmap.x,
31                             op->u.mmap.fd, op->u.mmap.offset);
32                         break;
33                 case MUNMAP:
34                         unmap(fd, (void *) op->u.munmap.addr,
35                               op->u.munmap.len);
36                         break;
37                 case MPROTECT:
38                         protect(fd, op->u.mprotect.addr, op->u.mprotect.len,
39                                 op->u.mprotect.r, op->u.mprotect.w,
40                                 op->u.mprotect.x);
41                         break;
42                 default:
43                         printk("Unknown op type %d in do_ops\n", op->type);
44                         break;
45                 }
46         }
47 }
48
49 static void fix_range(struct mm_struct *mm, unsigned long start_addr,
50                       unsigned long end_addr, int force)
51 {
52         int fd = mm->context.skas.mm_fd;
53
54         fix_range_common(mm, start_addr, end_addr, force, fd, do_ops);
55 }
56
57 void __flush_tlb_one_skas(unsigned long addr)
58 {
59         flush_tlb_kernel_range_common(addr, addr + PAGE_SIZE);
60 }
61
62 void flush_tlb_range_skas(struct vm_area_struct *vma, unsigned long start, 
63                      unsigned long end)
64 {
65         if(vma->vm_mm == NULL)
66                 flush_tlb_kernel_range_common(start, end);
67         else fix_range(vma->vm_mm, start, end, 0);
68 }
69
70 void flush_tlb_mm_skas(struct mm_struct *mm)
71 {
72         /* Don't bother flushing if this address space is about to be
73          * destroyed.
74          */
75         if(atomic_read(&mm->mm_users) == 0)
76                 return;
77
78         fix_range(mm, 0, host_task_size, 0);
79 }
80
81 void force_flush_all_skas(void)
82 {
83         fix_range(current->mm, 0, host_task_size, 1);
84 }