1 #ifndef __PARISC_MMU_CONTEXT_H
2 #define __PARISC_MMU_CONTEXT_H
5 #include <linux/sched.h>
6 #include <asm/atomic.h>
7 #include <asm/pgalloc.h>
8 #include <asm/pgtable.h>
9 #include <asm-generic/mm_hooks.h>
11 static inline void enter_lazy_tlb(struct mm_struct
*mm
, struct task_struct
*tsk
)
15 /* on PA-RISC, we actually have enough contexts to justify an allocator
18 extern unsigned long alloc_sid(void);
19 extern void free_sid(unsigned long);
22 init_new_context(struct task_struct
*tsk
, struct mm_struct
*mm
)
24 BUG_ON(atomic_read(&mm
->mm_users
) != 1);
26 mm
->context
= alloc_sid();
31 destroy_context(struct mm_struct
*mm
)
33 free_sid(mm
->context
);
37 static inline unsigned long __space_to_prot(mm_context_t ctx
)
39 #if SPACEID_SHIFT == 0
42 return context
>> (SPACEID_SHIFT
- 1);
46 static inline void load_context(mm_context_t context
)
49 mtctl(__space_to_prot(context
), 8);
52 static inline void switch_mm(struct mm_struct
*prev
, struct mm_struct
*next
, struct task_struct
*tsk
)
56 mtctl(__pa(next
->pgd
), 25);
57 load_context(next
->context
);
61 #define deactivate_mm(tsk,mm) do { } while (0)
63 static inline void activate_mm(struct mm_struct
*prev
, struct mm_struct
*next
)
66 * Activate_mm is our one chance to allocate a space id
67 * for a new mm created in the exec path. There's also
68 * some lazy tlb stuff, which is currently dead code, but
69 * we only allocate a space id if one hasn't been allocated
70 * already, so we should be OK.
73 BUG_ON(next
== &init_mm
); /* Should never happen */
75 if (next
->context
== 0)
76 next
->context
= alloc_sid();
78 switch_mm(prev
,next
,current
);