include/asm-parisc/tlbflush.h

   1 #ifndef _PARISC_TLBFLUSH_H
   2 #define _PARISC_TLBFLUSH_H
   3
   4 /* TLB flushing routines.... */
   5
   6 #include <linux/config.h>
   7 #include <linux/mm.h>
   8 #include <asm/mmu_context.h>
   9
  10 extern void flush_tlb_all(void);
  11
  12 /*
  13  * flush_tlb_mm()
  14  *
  15  * XXX This code is NOT valid for HP-UX compatibility processes,
  16  * (although it will probably work 99% of the time). HP-UX
  17  * processes are free to play with the space id's and save them
  18  * over long periods of time, etc. so we have to preserve the
  19  * space and just flush the entire tlb. We need to check the
  20  * personality in order to do that, but the personality is not
  21  * currently being set correctly.
  22  *
  23  * Of course, Linux processes could do the same thing, but
  24  * we don't support that (and the compilers, dynamic linker,
  25  * etc. do not do that).
  26  */
  27
  28 static inline void flush_tlb_mm(struct mm_struct *mm)
  29 {
  30         BUG_ON(mm == &init_mm); /* Should never happen */
  31
  32 #ifdef CONFIG_SMP
  33         flush_tlb_all();
  34 #else
  35         if (mm) {
  36                 if (mm->context != 0)
  37                         free_sid(mm->context);
  38                 mm->context = alloc_sid();
  39                 if (mm == current->active_mm)
  40                         load_context(mm->context);
  41         }
  42 #endif
  43 }
  44
  45 extern __inline__ void flush_tlb_pgtables(struct mm_struct *mm, unsigned long start, unsigned long end)
  46 {
  47 }
  48
  49 static inline void flush_tlb_page(struct vm_area_struct *vma,
  50         unsigned long addr)
  51 {
  52         /* For one page, it's not worth testing the split_tlb variable */
  53
  54         mb();
  55         mtsp(vma->vm_mm->context,1);
  56         purge_tlb_start();
  57         pdtlb(addr);
  58         pitlb(addr);
  59         purge_tlb_end();
  60 }
  61
  62 static inline void flush_tlb_range(struct vm_area_struct *vma,
  63         unsigned long start, unsigned long end)
  64 {
  65         unsigned long npages;
  66
  67
  68         npages = ((end - (start & PAGE_MASK)) + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
  69         if (npages >= 512)  /* XXX arbitrary, should be tuned */
  70                 flush_tlb_all();
  71         else {
  72
  73                 mtsp(vma->vm_mm->context,1);
  74                 if (split_tlb) {
  75                         purge_tlb_start();
  76                         while (npages--) {
  77                                 pdtlb(start);
  78                                 pitlb(start);
  79                                 start += PAGE_SIZE;
  80                         }
  81                         purge_tlb_end();
  82                 } else {
  83                         purge_tlb_start();
  84                         while (npages--) {
  85                                 pdtlb(start);
  86                                 start += PAGE_SIZE;
  87                         }
  88                         purge_tlb_end();
  89                 }
  90         }
  91 }
  92
  93 #define flush_tlb_kernel_range(start, end) flush_tlb_all()
  94
  95 #endif