release/src-rt-6.x.4708/linux/linux-2.6.36/arch/ia64/include/asm/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 extern void setup_ptcg_sem(int max_purges, int from_palo);
  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   extern void smp_flush_tlb_cpumask (cpumask_t xcpumask);
  32 # define flush_tlb_all()        smp_flush_tlb_all()
  33 #else
  34 # define flush_tlb_all()        local_flush_tlb_all()
  35 # define smp_flush_tlb_cpumask(m) local_flush_tlb_all()
  36 #endif
  37
  38 static inline void
  39 local_finish_flush_tlb_mm (struct mm_struct *mm)
  40 {
  41         if (mm == current->active_mm)
  42                 activate_context(mm);
  43 }
  44
  45 /*
  46  * Flush a specified user mapping.  This is called, e.g., as a result of fork() and
  47  * exit().  fork() ends up here because the copy-on-write mechanism needs to write-protect
  48  * the PTEs of the parent task.
  49  */
  50 static inline void
  51 flush_tlb_mm (struct mm_struct *mm)
  52 {
  53         if (!mm)
  54                 return;
  55
  56         set_bit(mm->context, ia64_ctx.flushmap);
  57         mm->context = 0;
  58
  59         if (atomic_read(&mm->mm_users) == 0)
  60                 return;         /* happens as a result of exit_mmap() */
  61
  62 #ifdef CONFIG_SMP
  63         smp_flush_tlb_mm(mm);
  64 #else
  65         local_finish_flush_tlb_mm(mm);
  66 #endif
  67 }
  68
  69 extern void flush_tlb_range (struct vm_area_struct *vma, unsigned long start, unsigned long end);
  70
  71 /*
  72  * Page-granular tlb flush.
  73  */
  74 static inline void
  75 flush_tlb_page (struct vm_area_struct *vma, unsigned long addr)
  76 {
  77 #ifdef CONFIG_SMP
  78         flush_tlb_range(vma, (addr & PAGE_MASK), (addr & PAGE_MASK) + PAGE_SIZE);
  79 #else
  80         if (vma->vm_mm == current->active_mm)
  81                 ia64_ptcl(addr, (PAGE_SHIFT << 2));
  82         else
  83                 vma->vm_mm->context = 0;
  84 #endif
  85 }
  86
  87 /*
  88  * Flush the local TLB. Invoked from another cpu using an IPI.
  89  */
  90 #ifdef CONFIG_SMP
  91 void smp_local_flush_tlb(void);
  92 #else
  93 #define smp_local_flush_tlb()
  94 #endif
  95
  96 static inline void flush_tlb_kernel_range(unsigned long start,
  97                                           unsigned long end)
  98 {
  99         flush_tlb_all();
 100 }
 101
 102 #endif /* _ASM_IA64_TLBFLUSH_H */