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  */
  17 extern 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
  22 extern void flush_tlb_all(void);
  23 extern 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
  41 static 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
  61 static 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
  76 void __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