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