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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> |
60063497 | 6 | #include <linux/atomic.h> |
1da177e4 LT |
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 | ||
70da2d96 | 37 | static inline unsigned long __space_to_prot(mm_context_t context) |
1da177e4 | 38 | { |
1da177e4 | 39 | #if SPACEID_SHIFT == 0 |
a60715f5 | 40 | return context << 1; |
1da177e4 | 41 | #else |
a60715f5 | 42 | return context >> (SPACEID_SHIFT - 1); |
1da177e4 LT |
43 | #endif |
44 | } | |
45 | ||
a60715f5 KM |
46 | static inline void load_context(mm_context_t context) |
47 | { | |
48 | mtsp(context, 3); | |
49 | mtctl(__space_to_prot(context), 8); | |
50 | } | |
51 | ||
1da177e4 LT |
52 | static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, struct task_struct *tsk) |
53 | { | |
54 | ||
55 | if (prev != next) { | |
56 | mtctl(__pa(next->pgd), 25); | |
57 | load_context(next->context); | |
58 | } | |
59 | } | |
60 | ||
61 | #define deactivate_mm(tsk,mm) do { } while (0) | |
62 | ||
63 | static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next) | |
64 | { | |
65 | /* | |
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. | |
71 | */ | |
72 | ||
73 | BUG_ON(next == &init_mm); /* Should never happen */ | |
74 | ||
75 | if (next->context == 0) | |
76 | next->context = alloc_sid(); | |
77 | ||
78 | switch_mm(prev,next,current); | |
79 | } | |
80 | #endif |