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mmu_context.h

#ifndef __PARISC_MMU_CONTEXT_H
#define __PARISC_MMU_CONTEXT_H

#include <linux/mm.h>
#include <linux/sched.h>
#include <asm/atomic.h>
#include <asm/pgalloc.h>
#include <asm/pgtable.h>
#include <asm-generic/mm_hooks.h>

static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
{
}

/* on PA-RISC, we actually have enough contexts to justify an allocator
 * for them.  prumpf */

extern unsigned long alloc_sid(void);
extern void free_sid(unsigned long);

static inline int
init_new_context(struct task_struct *tsk, struct mm_struct *mm)
{
      BUG_ON(atomic_read(&mm->mm_users) != 1);

      mm->context = alloc_sid();
      return 0;
}

static inline void
destroy_context(struct mm_struct *mm)
{
      free_sid(mm->context);
      mm->context = 0;
}

static inline void load_context(mm_context_t context)
{
      mtsp(context, 3);
#if SPACEID_SHIFT == 0
      mtctl(context << 1,8);
#else
      mtctl(context >> (SPACEID_SHIFT - 1),8);
#endif
}

static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, struct task_struct *tsk)
{

      if (prev != next) {
            mtctl(__pa(next->pgd), 25);
            load_context(next->context);
      }
}

#define deactivate_mm(tsk,mm) do { } while (0)

static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
{
      /*
       * Activate_mm is our one chance to allocate a space id
       * for a new mm created in the exec path. There's also
       * some lazy tlb stuff, which is currently dead code, but
       * we only allocate a space id if one hasn't been allocated
       * already, so we should be OK.
       */

      BUG_ON(next == &init_mm); /* Should never happen */

      if (next->context == 0)
          next->context = alloc_sid();

      switch_mm(prev,next,current);
}
#endif

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