| #ifndef __PARISC_MMU_CONTEXT_H |
| #define __PARISC_MMU_CONTEXT_H |
| |
| #include <asm/pgalloc.h> |
| |
| static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk, unsigned cpu) |
| { |
| } |
| |
| /* on PA-RISC, we actually have enough contexts to justify an allocator |
| * for them. prumpf */ |
| |
| extern unsigned long alloc_sid(void); |
| extern void free_sid(unsigned long); |
| |
| static inline int |
| init_new_context(struct task_struct *tsk, struct mm_struct *mm) |
| { |
| if (atomic_read(&mm->mm_users) != 1) |
| BUG(); |
| |
| mm->context = alloc_sid(); |
| return 0; |
| } |
| |
| static inline void |
| destroy_context(struct mm_struct *mm) |
| { |
| free_sid(mm->context); |
| mm->context = 0; |
| } |
| |
| static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, struct task_struct *tsk, unsigned cpu) |
| { |
| |
| if (prev != next) { |
| mtctl(__pa(next->pgd), 25); |
| load_context(next->context); |
| } |
| } |
| |
| static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next) |
| { |
| /* |
| * Activate_mm is our one chance to allocate a space id |
| * for a new mm created in the exec path. There's also |
| * some lazy tlb stuff, which is currently dead code, but |
| * we only allocate a space id if one hasn't been allocated |
| * already, so we should be OK. |
| */ |
| |
| if (next == &init_mm) BUG(); /* Should never happen */ |
| |
| if (next->context == 0) |
| next->context = alloc_sid(); |
| |
| switch_mm(prev,next,current,0); |
| } |
| #endif |