LXR linux/arch/parisc/include/asm/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 <linux/sched.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 systems not just the N class.
  16 */
  17extern spinlock_t pa_tlb_lock;
  18
  19#define purge_tlb_start(flags)  spin_lock_irqsave(&pa_tlb_lock, flags)
  20#define purge_tlb_end(flags)    spin_unlock_irqrestore(&pa_tlb_lock, flags)
  21
  22extern void flush_tlb_all(void);
  23extern void flush_tlb_all_local(void *);
  24
  25#define smp_flush_tlb_all()     flush_tlb_all()
  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
  43static inline void flush_tlb_mm(struct mm_struct *mm)
  44{
  45        BUG_ON(mm == &init_mm); /* Should never happen */
  46
  47#if 1 || defined(CONFIG_SMP)
  48        flush_tlb_all();
  49#else
  50        /* FIXME: currently broken, causing space id and protection ids
  51         *  to go out of sync, resulting in faults on userspace accesses.
  52         */
  53        if (mm) {
  54                if (mm->context != 0)
  55                        free_sid(mm->context);
  56                mm->context = alloc_sid();
  57                if (mm == current->active_mm)
  58                        load_context(mm->context);
  59        }
  60#endif
  61}
  62
  63static inline void flush_tlb_page(struct vm_area_struct *vma,
  64        unsigned long addr)
  65{
  66        unsigned long flags, sid;
  67
  68        /* For one page, it's not worth testing the split_tlb variable */
  69
  70        mb();
  71        sid = vma->vm_mm->context;
  72        purge_tlb_start(flags);
  73        mtsp(sid, 1);
  74        pdtlb(addr);
  75        pitlb(addr);
  76        purge_tlb_end(flags);
  77}
  78
  79void __flush_tlb_range(unsigned long sid,
  80        unsigned long start, unsigned long end);
  81
  82#define flush_tlb_range(vma,start,end) __flush_tlb_range((vma)->vm_mm->context,start,end)
  83
  84#define flush_tlb_kernel_range(start, end) __flush_tlb_range(0,start,end)
  85
  86#endif
  87