include/asm-parisc/tlbflush.h

   1 #ifndef _PARISC_TLBFLUSH_H
   2 #define _PARISC_TLBFLUSH_H
   3
   4 /* TLB flushing routines.... */
   5
   6 #include <linux/mm.h>
   7 #include <asm/mmu_context.h>
   8
   9 extern void flush_tlb_all(void);
  10
  11 /*
  12  * flush_tlb_mm()
  13  *
  14  * XXX This code is NOT valid for HP-UX compatibility processes,
  15  * (although it will probably work 99% of the time). HP-UX
  16  * processes are free to play with the space id's and save them
  17  * over long periods of time, etc. so we have to preserve the
  18  * space and just flush the entire tlb. We need to check the
  19  * personality in order to do that, but the personality is not
  20  * currently being set correctly.
  21  *
  22  * Of course, Linux processes could do the same thing, but
  23  * we don't support that (and the compilers, dynamic linker,
  24  * etc. do not do that).
  25  */
  26
  27 static inline void flush_tlb_mm(struct mm_struct *mm)
  28 {
  29         if (mm == &init_mm) BUG(); /* Should never happen */
  30
  31 #ifdef CONFIG_SMP
  32         flush_tlb_all();
  33 #else
  34         if (mm) {
  35                 if (mm->context != 0)
  36                         free_sid(mm->context);
  37                 mm->context = alloc_sid();
  38                 if (mm == current->active_mm)
  39                         load_context(mm->context);
  40         }
  41 #endif
  42 }
  43
  44 extern __inline__ void flush_tlb_pgtables(struct mm_struct *mm, unsigned long start, unsigned long end)
  45 {
  46 }
  47
  48 static inline void flush_tlb_page(struct vm_area_struct *vma,
  49         unsigned long addr)
  50 {
  51         /* For one page, it's not worth testing the split_tlb variable */
  52
  53         mtsp(vma->vm_mm->context,1);
  54         pdtlb(addr);
  55         pitlb(addr);
  56 }
  57
  58 static inline void flush_tlb_range(struct vm_area_struct *vma,
  59         unsigned long start, unsigned long end)
  60 {
  61         unsigned long npages;
  62
  63         npages = ((end - (start & PAGE_MASK)) + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
  64         if (npages >= 512)  /* XXX arbitrary, should be tuned */
  65                 flush_tlb_all();
  66         else {
  67
  68                 mtsp(vma->vm_mm->context,1);
  69                 if (split_tlb) {
  70                         while (npages--) {
  71                                 pdtlb(start);
  72                                 pitlb(start);
  73                                 start += PAGE_SIZE;
  74                         }
  75                 } else {
  76                         while (npages--) {
  77                                 pdtlb(start);
  78                                 start += PAGE_SIZE;
  79                         }
  80                 }
  81         }
  82 }
  83
  84 #define flush_tlb_kernel_range(start, end) flush_tlb_all()
  85
  86 #endif