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         flush_tlb_kernel_range_common(start_vm, end_vm);
  80 }
  81
  82 void force_flush_all_skas(void)
  83 {
  84         fix_range(current->mm, 0, host_task_size, 1);
  85 }