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