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