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
  11 /* This is for the serialisation of PxTLB broadcasts.  At least on the
  12  * N class systems, only one PxTLB inter processor broadcast can be
  13  * active at any one time on the Merced bus.  This tlb purge
  14  * synchronisation is fairly lightweight and harmless so we activate
  15  * it on all SMP systems not just the N class.  We also need to have
  16  * preemption disabled on uniprocessor machines, and spin_lock does that
  17  * nicely.
  18  */
  19 extern spinlock_t pa_tlb_lock;
  20
  21 #define purge_tlb_start(x) spin_lock(&pa_tlb_lock)
  22 #define purge_tlb_end(x) spin_unlock(&pa_tlb_lock)
  23
  24 extern void flush_tlb_all(void);
  25
  26 /*
  27  * flush_tlb_mm()
  28  *
  29  * XXX This code is NOT valid for HP-UX compatibility processes,
  30  * (although it will probably work 99% of the time). HP-UX
  31  * processes are free to play with the space id's and save them
  32  * over long periods of time, etc. so we have to preserve the
  33  * space and just flush the entire tlb. We need to check the
  34  * personality in order to do that, but the personality is not
  35  * currently being set correctly.
  36  *
  37  * Of course, Linux processes could do the same thing, but
  38  * we don't support that (and the compilers, dynamic linker,
  39  * etc. do not do that).
  40  */
  41
  42 static inline void flush_tlb_mm(struct mm_struct *mm)
  43 {
  44         BUG_ON(mm == &init_mm); /* Should never happen */
  45
  46 #ifdef CONFIG_SMP
  47         flush_tlb_all();
  48 #else
  49         if (mm) {
  50                 if (mm->context != 0)
  51                         free_sid(mm->context);
  52                 mm->context = alloc_sid();
  53                 if (mm == current->active_mm)
  54                         load_context(mm->context);
  55         }
  56 #endif
  57 }
  58
  59 extern __inline__ void flush_tlb_pgtables(struct mm_struct *mm, unsigned long start, unsigned long end)
  60 {
  61 }
  62
  63 static inline void flush_tlb_page(struct vm_area_struct *vma,
  64         unsigned long addr)
  65 {
  66         /* For one page, it's not worth testing the split_tlb variable */
  67
  68         mb();
  69         mtsp(vma->vm_mm->context,1);
  70         purge_tlb_start();
  71         pdtlb(addr);
  72         pitlb(addr);
  73         purge_tlb_end();
  74 }
  75
  76 static inline void flush_tlb_range(struct vm_area_struct *vma,
  77         unsigned long start, unsigned long end)
  78 {
  79         unsigned long npages;
  80
  81         npages = ((end - (start & PAGE_MASK)) + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
  82         if (npages >= 512)  /* 2MB of space: arbitrary, should be tuned */
  83                 flush_tlb_all();
  84         else {
  85                 mtsp(vma->vm_mm->context,1);
  86                 purge_tlb_start();
  87                 if (split_tlb) {
  88                         while (npages--) {
  89                                 pdtlb(start);
  90                                 pitlb(start);
  91                                 start += PAGE_SIZE;
  92                         }
  93                 } else {
  94                         while (npages--) {
  95                                 pdtlb(start);
  96                                 start += PAGE_SIZE;
  97                         }
  98                 }
  99                 purge_tlb_end();
 100         }
 101 }
 102
 103 #define flush_tlb_kernel_range(start, end) flush_tlb_all()
 104
 105 #endif