projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | #ifndef __PARISC_MMU_CONTEXT_H |
| 2 | #define __PARISC_MMU_CONTEXT_H | |
| 3 | ||
| 4 | #include <linux/mm.h> | |
| e8edc6e0 | 5 | #include <linux/sched.h> |
| 1da177e4 LT |
6 | #include <asm/atomic.h> |
| 7 | #include <asm/pgalloc.h> | |
| 8 | #include <asm/pgtable.h> | |
| d6dd61c8 | 9 | #include <asm-generic/mm_hooks.h> |
| 1da177e4 LT |
10 | |
| 11 | static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk) | |
| 12 | { | |
| 13 | } | |
| 14 | ||
| 15 | /* on PA-RISC, we actually have enough contexts to justify an allocator | |
| 16 | * for them. prumpf */ | |
| 17 | ||
| 18 | extern unsigned long alloc_sid(void); | |
| 19 | extern void free_sid(unsigned long); | |
| 20 | ||
| 21 | static inline int | |
| 22 | init_new_context(struct task_struct *tsk, struct mm_struct *mm) | |
| 23 | { | |
| 24 | BUG_ON(atomic_read(&mm->mm_users) != 1); | |
| 25 | ||
| 26 | mm->context = alloc_sid(); | |
| 27 | return 0; | |
| 28 | } | |
| 29 | ||
| 30 | static inline void | |
| 31 | destroy_context(struct mm_struct *mm) | |
| 32 | { | |
| 33 | free_sid(mm->context); | |
| 34 | mm->context = 0; | |
| 35 | } | |
| 36 | ||
| 37 | static inline void load_context(mm_context_t context) | |
| 38 | { | |
| 39 | mtsp(context, 3); | |
| 40 | #if SPACEID_SHIFT == 0 | |
| 41 | mtctl(context << 1,8); | |
| 42 | #else | |
| 43 | mtctl(context >> (SPACEID_SHIFT - 1),8); | |
| 44 | #endif | |
| 45 | } | |
| 46 | ||
| 47 | static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, struct task_struct *tsk) | |
| 48 | { | |
| 49 | ||
| 50 | if (prev != next) { | |
| 51 | mtctl(__pa(next->pgd), 25); | |
| 52 | load_context(next->context); | |
| 53 | } | |
| 54 | } | |
| 55 | ||
| 56 | #define deactivate_mm(tsk,mm) do { } while (0) | |
| 57 | ||
| 58 | static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next) | |
| 59 | { | |
| 60 | /* | |
| 61 | * Activate_mm is our one chance to allocate a space id | |
| 62 | * for a new mm created in the exec path. There's also | |
| 63 | * some lazy tlb stuff, which is currently dead code, but | |
| 64 | * we only allocate a space id if one hasn't been allocated | |
| 65 | * already, so we should be OK. | |
| 66 | */ | |
| 67 | ||
| 68 | BUG_ON(next == &init_mm); /* Should never happen */ | |
| 69 | ||
| 70 | if (next->context == 0) | |
| 71 | next->context = alloc_sid(); | |
| 72 | ||
| 73 | switch_mm(prev,next,current); | |
| 74 | } | |
| 75 | #endif |