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