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/*
  26 * flush_tlb_mm()
  27 *
  28 * XXX This code is NOT valid for HP-UX compatibility processes,
  29 * (although it will probably work 99% of the time). HP-UX
  30 * processes are free to play with the space id's and save them
  31 * over long periods of time, etc. so we have to preserve the
  32 * space and just flush the entire tlb. We need to check the
  33 * personality in order to do that, but the personality is not
  34 * currently being set correctly.
  35 *
  36 * Of course, Linux processes could do the same thing, but
  37 * we don't support that (and the compilers, dynamic linker,
  38 * etc. do not do that).
  39 */
  40
  41static inline void flush_tlb_mm(struct mm_struct *mm)
  42{
  43        BUG_ON(mm == &init_mm); /* Should never happen */
  44
  45#if 1 || defined(CONFIG_SMP)
  46        flush_tlb_all();
  47#else
  48        /* FIXME: currently broken, causing space id and protection ids
  49         *  to go out of sync, resulting in faults on userspace accesses.
  50         */
  51        if (mm) {
  52                if (mm->context != 0)
  53                        free_sid(mm->context);
  54                mm->context = alloc_sid();
  55                if (mm == current->active_mm)
  56                        load_context(mm->context);
  57        }
  58#endif
  59}
  60
  61static inline void flush_tlb_page(struct vm_area_struct *vma,
  62        unsigned long addr)
  63{
  64        unsigned long flags;
  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(flags);
  71        pdtlb(addr);
  72        pitlb(addr);
  73        purge_tlb_end(flags);
  74}
  75
  76void __flush_tlb_range(unsigned long sid,
  77        unsigned long start, unsigned long end);
  78
  79#define flush_tlb_range(vma,start,end) __flush_tlb_range((vma)->vm_mm->context,start,end)
  80
  81#define flush_tlb_kernel_range(start, end) __flush_tlb_range(0,start,end)
  82
  83#endif
  84