include/asm-ia64/tlbflush.h

   1 #ifndef _ASM_IA64_TLBFLUSH_H
   2 #define _ASM_IA64_TLBFLUSH_H
   3
   4 /*
   5  * Copyright (C) 2002 Hewlett-Packard Co
   6  *      David Mosberger-Tang <davidm@hpl.hp.com>
   7  */
   8
   9
  10 #include <linux/mm.h>
  11
  12 #include <asm/intrinsics.h>
  13 #include <asm/mmu_context.h>
  14 #include <asm/page.h>
  15
  16 /*
  17  * Now for some TLB flushing routines.  This is the kind of stuff that
  18  * can be very expensive, so try to avoid them whenever possible.
  19  */
  20
  21 /*
  22  * Flush everything (kernel mapping may also have changed due to
  23  * vmalloc/vfree).
  24  */
  25 extern void local_flush_tlb_all (void);
  26
  27 #ifdef CONFIG_SMP
  28   extern void smp_flush_tlb_all (void);
  29   extern void smp_flush_tlb_mm (struct mm_struct *mm);
  30 # define flush_tlb_all()        smp_flush_tlb_all()
  31 #else
  32 # define flush_tlb_all()        local_flush_tlb_all()
  33 #endif
  34
  35 static inline void
  36 local_finish_flush_tlb_mm (struct mm_struct *mm)
  37 {
  38         if (mm == current->active_mm)
  39                 activate_context(mm);
  40 }
  41
  42 /*
  43  * Flush a specified user mapping.  This is called, e.g., as a result of fork() and
  44  * exit().  fork() ends up here because the copy-on-write mechanism needs to write-protect
  45  * the PTEs of the parent task.
  46  */
  47 static inline void
  48 flush_tlb_mm (struct mm_struct *mm)
  49 {
  50         if (!mm)
  51                 return;
  52
  53         set_bit(mm->context, ia64_ctx.flushmap);
  54         mm->context = 0;
  55
  56         if (atomic_read(&mm->mm_users) == 0)
  57                 return;         /* happens as a result of exit_mmap() */
  58
  59 #ifdef CONFIG_SMP
  60         smp_flush_tlb_mm(mm);
  61 #else
  62         local_finish_flush_tlb_mm(mm);
  63 #endif
  64 }
  65
  66 extern void flush_tlb_range (struct vm_area_struct *vma, unsigned long start, unsigned long end);
  67
  68 /*
  69  * Page-granular tlb flush.
  70  */
  71 static inline void
  72 flush_tlb_page (struct vm_area_struct *vma, unsigned long addr)
  73 {
  74 #ifdef CONFIG_SMP
  75         flush_tlb_range(vma, (addr & PAGE_MASK), (addr & PAGE_MASK) + PAGE_SIZE);
  76 #else
  77         if (vma->vm_mm == current->active_mm)
  78                 ia64_ptcl(addr, (PAGE_SHIFT << 2));
  79         else
  80                 vma->vm_mm->context = 0;
  81 #endif
  82 }
  83
  84 /*
  85  * Flush the TLB entries mapping the virtually mapped linear page
  86  * table corresponding to address range [START-END).
  87  */
  88 static inline void
  89 flush_tlb_pgtables (struct mm_struct *mm, unsigned long start, unsigned long end)
  90 {
  91         /*
  92          * Deprecated.  The virtual page table is now flushed via the normal gather/flush
  93          * interface (see tlb.h).
  94          */
  95 }
  96
  97 #define flush_tlb_kernel_range(start, end)      flush_tlb_all() /* XXX fix me */
  98
  99 #endif /* _ASM_IA64_TLBFLUSH_H */