arch/um/kernel/tt/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/kernel.h"
   9 #include "linux/sched.h"
  10 #include "linux/mm.h"
  11 #include "asm/page.h"
  12 #include "asm/pgtable.h"
  13 #include "asm/uaccess.h"
  14 #include "asm/tlbflush.h"
  15 #include "mem_user.h"
  16 #include "os.h"
  17 #include "tlb.h"
  18
  19 static int do_ops(union mm_context *mmu, struct host_vm_op *ops, int last,
  20                     int finished, void **flush)
  21 {
  22         struct host_vm_op *op;
  23         int i, ret=0;
  24
  25         for(i = 0; i <= last && !ret; i++){
  26                 op = &ops[i];
  27                 switch(op->type){
  28                 case MMAP:
  29                         ret = os_map_memory((void *) op->u.mmap.addr,
  30                                             op->u.mmap.fd, op->u.mmap.offset,
  31                                             op->u.mmap.len, op->u.mmap.r,
  32                                             op->u.mmap.w, op->u.mmap.x);
  33                         break;
  34                 case MUNMAP:
  35                         ret = os_unmap_memory((void *) op->u.munmap.addr,
  36                                               op->u.munmap.len);
  37                         break;
  38                 case MPROTECT:
  39                         ret = protect_memory(op->u.mprotect.addr,
  40                                              op->u.munmap.len,
  41                                              op->u.mprotect.r,
  42                                              op->u.mprotect.w,
  43                                              op->u.mprotect.x, 1);
  44                         protect_memory(op->u.mprotect.addr, op->u.munmap.len,
  45                                        op->u.mprotect.r, op->u.mprotect.w,
  46                                        op->u.mprotect.x, 1);
  47                         break;
  48                 default:
  49                         printk("Unknown op type %d in do_ops\n", op->type);
  50                         break;
  51                 }
  52         }
  53
  54         return ret;
  55 }
  56
  57 static void fix_range(struct mm_struct *mm, unsigned long start_addr,
  58                       unsigned long end_addr, int force)
  59 {
  60         if((current->thread.mode.tt.extern_pid != -1) &&
  61            (current->thread.mode.tt.extern_pid != os_getpid()))
  62                 panic("fix_range fixing wrong address space, current = 0x%p",
  63                       current);
  64
  65         fix_range_common(mm, start_addr, end_addr, force, do_ops);
  66 }
  67
  68 atomic_t vmchange_seq = ATOMIC_INIT(1);
  69
  70 void flush_tlb_kernel_range_tt(unsigned long start, unsigned long end)
  71 {
  72         if(flush_tlb_kernel_range_common(start, end))
  73                 atomic_inc(&vmchange_seq);
  74 }
  75
  76 void flush_tlb_kernel_vm_tt(void)
  77 {
  78         flush_tlb_kernel_range(start_vm, end_vm);
  79 }
  80
  81 void __flush_tlb_one_tt(unsigned long addr)
  82 {
  83         flush_tlb_kernel_range(addr, addr + PAGE_SIZE);
  84 }
  85
  86 void flush_tlb_range_tt(struct vm_area_struct *vma, unsigned long start,
  87                      unsigned long end)
  88 {
  89         if(vma->vm_mm != current->mm) return;
  90
  91         /* Assumes that the range start ... end is entirely within
  92          * either process memory or kernel vm
  93          */
  94         if((start >= start_vm) && (start < end_vm)){
  95                 if(flush_tlb_kernel_range_common(start, end))
  96                         atomic_inc(&vmchange_seq);
  97         }
  98         else fix_range(vma->vm_mm, start, end, 0);
  99 }
 100
 101 void flush_tlb_mm_tt(struct mm_struct *mm)
 102 {
 103         unsigned long seq;
 104
 105         if(mm != current->mm) return;
 106
 107         fix_range(mm, 0, STACK_TOP, 0);
 108
 109         seq = atomic_read(&vmchange_seq);
 110         if(current->thread.mode.tt.vm_seq == seq)
 111                 return;
 112         current->thread.mode.tt.vm_seq = seq;
 113         flush_tlb_kernel_range_common(start_vm, end_vm);
 114 }
 115
 116 void force_flush_all_tt(void)
 117 {
 118         fix_range(current->mm, 0, STACK_TOP, 1);
 119         flush_tlb_kernel_range_common(start_vm, end_vm);
 120 }