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