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/config.h"
  10 #include "linux/mm.h"
  11 #include "asm/page.h"
  12 #include "asm/pgtable.h"
  13 #include "asm/mmu.h"
  14 #include "user_util.h"
  15 #include "mem_user.h"
  16 #include "mem.h"
  17 #include "skas.h"
  18 #include "os.h"
  19 #include "tlb.h"
  20
  21 static void do_ops(union mm_context *mmu, struct host_vm_op *ops, int last)
  22 {
  23         struct host_vm_op *op;
  24         int i;
  25
  26         for(i = 0; i <= last; i++){
  27                 op = &ops[i];
  28                 switch(op->type){
  29                 case MMAP:
  30                         map(&mmu->skas.id, op->u.mmap.addr, op->u.mmap.len,
  31                             op->u.mmap.r, op->u.mmap.w, op->u.mmap.x,
  32                             op->u.mmap.fd, op->u.mmap.offset);
  33                         break;
  34                 case MUNMAP:
  35                         unmap(&mmu->skas.id, (void *) op->u.munmap.addr,
  36                               op->u.munmap.len);
  37                         break;
  38                 case MPROTECT:
  39                         protect(&mmu->skas.id, op->u.mprotect.addr,
  40                                 op->u.mprotect.len, op->u.mprotect.r,
  41                                 op->u.mprotect.w, op->u.mprotect.x);
  42                         break;
  43                 default:
  44                         printk("Unknown op type %d in do_ops\n", op->type);
  45                         break;
  46                 }
  47         }
  48 }
  49
  50 extern int proc_mm;
  51
  52 static void fix_range(struct mm_struct *mm, unsigned long start_addr,
  53                       unsigned long end_addr, int force)
  54 {
  55         if(!proc_mm && (end_addr > CONFIG_STUB_START))
  56                 end_addr = CONFIG_STUB_START;
  57
  58         fix_range_common(mm, start_addr, end_addr, force, do_ops);
  59 }
  60
  61 void __flush_tlb_one_skas(unsigned long addr)
  62 {
  63         flush_tlb_kernel_range_common(addr, addr + PAGE_SIZE);
  64 }
  65
  66 void flush_tlb_range_skas(struct vm_area_struct *vma, unsigned long start,
  67                      unsigned long end)
  68 {
  69         if(vma->vm_mm == NULL)
  70                 flush_tlb_kernel_range_common(start, end);
  71         else fix_range(vma->vm_mm, start, end, 0);
  72 }
  73
  74 void flush_tlb_mm_skas(struct mm_struct *mm)
  75 {
  76         unsigned long end;
  77
  78         /* Don't bother flushing if this address space is about to be
  79          * destroyed.
  80          */
  81         if(atomic_read(&mm->mm_users) == 0)
  82                 return;
  83
  84         end = proc_mm ? task_size : CONFIG_STUB_START;
  85         fix_range(mm, 0, end, 0);
  86 }
  87
  88 void force_flush_all_skas(void)
  89 {
  90         unsigned long end = proc_mm ? task_size : CONFIG_STUB_START;
  91         fix_range(current->mm, 0, end, 1);
  92 }