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 int do_ops(union mm_context *mmu, struct host_vm_op *ops, int last,
  22                   int finished, void **flush)
  23 {
  24         struct host_vm_op *op;
  25         int i, ret = 0;
  26
  27         for(i = 0; i <= last && !ret; i++){
  28                 op = &ops[i];
  29                 switch(op->type){
  30                 case MMAP:
  31                         ret = map(&mmu->skas.id, op->u.mmap.addr,
  32                                   op->u.mmap.len, op->u.mmap.r, op->u.mmap.w,
  33                                   op->u.mmap.x, op->u.mmap.fd,
  34                                   op->u.mmap.offset, finished, flush);
  35                         break;
  36                 case MUNMAP:
  37                         ret = unmap(&mmu->skas.id,
  38                                     (void *) op->u.munmap.addr,
  39                                     op->u.munmap.len, finished, flush);
  40                         break;
  41                 case MPROTECT:
  42                         ret = protect(&mmu->skas.id, op->u.mprotect.addr,
  43                                       op->u.mprotect.len, op->u.mprotect.r,
  44                                       op->u.mprotect.w, op->u.mprotect.x,
  45                                       finished, flush);
  46                         break;
  47                 default:
  48                         printk("Unknown op type %d in do_ops\n", op->type);
  49                         break;
  50                 }
  51         }
  52
  53         return ret;
  54 }
  55
  56 extern int proc_mm;
  57
  58 static void fix_range(struct mm_struct *mm, unsigned long start_addr,
  59                       unsigned long end_addr, int force)
  60 {
  61         if(!proc_mm && (end_addr > CONFIG_STUB_START))
  62                 end_addr = CONFIG_STUB_START;
  63
  64         fix_range_common(mm, start_addr, end_addr, force, do_ops);
  65 }
  66
  67 void __flush_tlb_one_skas(unsigned long addr)
  68 {
  69         flush_tlb_kernel_range_common(addr, addr + PAGE_SIZE);
  70 }
  71
  72 void flush_tlb_range_skas(struct vm_area_struct *vma, unsigned long start,
  73                      unsigned long end)
  74 {
  75         if(vma->vm_mm == NULL)
  76                 flush_tlb_kernel_range_common(start, end);
  77         else fix_range(vma->vm_mm, start, end, 0);
  78 }
  79
  80 void flush_tlb_mm_skas(struct mm_struct *mm)
  81 {
  82         unsigned long end;
  83
  84         /* Don't bother flushing if this address space is about to be
  85          * destroyed.
  86          */
  87         if(atomic_read(&mm->mm_users) == 0)
  88                 return;
  89
  90         end = proc_mm ? task_size : CONFIG_STUB_START;
  91         fix_range(mm, 0, end, 0);
  92 }
  93
  94 void force_flush_all_skas(void)
  95 {
  96         unsigned long end = proc_mm ? task_size : CONFIG_STUB_START;
  97         fix_range(current->mm, 0, end, 1);
  98 }