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