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