| #ifndef __PARISC_MMU_CONTEXT_H |
| #define __PARISC_MMU_CONTEXT_H |
| |
| #include <linux/mm.h> |
| #include <linux/sched.h> |
| #include <linux/atomic.h> |
| #include <asm/pgalloc.h> |
| #include <asm/pgtable.h> |
| #include <asm-generic/mm_hooks.h> |
| |
| static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk) |
| { |
| } |
| |
| /* 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) |
| { |
| BUG_ON(atomic_read(&mm->mm_users) != 1); |
| |
| mm->context = alloc_sid(); |
| return 0; |
| } |
| |
| static inline void |
| destroy_context(struct mm_struct *mm) |
| { |
| free_sid(mm->context); |
| mm->context = 0; |
| } |
| |
| static inline unsigned long __space_to_prot(mm_context_t context) |
| { |
| #if SPACEID_SHIFT == 0 |
| return context << 1; |
| #else |
| return context >> (SPACEID_SHIFT - 1); |
| #endif |
| } |
| |
| static inline void load_context(mm_context_t context) |
| { |
| mtsp(context, 3); |
| mtctl(__space_to_prot(context), 8); |
| } |
| |
| static inline void switch_mm_irqs_off(struct mm_struct *prev, |
| struct mm_struct *next, struct task_struct *tsk) |
| { |
| if (prev != next) { |
| mtctl(__pa(next->pgd), 25); |
| load_context(next->context); |
| } |
| } |
| |
| static inline void switch_mm(struct mm_struct *prev, |
| struct mm_struct *next, struct task_struct *tsk) |
| { |
| unsigned long flags; |
| |
| if (prev == next) |
| return; |
| |
| local_irq_save(flags); |
| switch_mm_irqs_off(prev, next, tsk); |
| local_irq_restore(flags); |
| } |
| #define switch_mm_irqs_off switch_mm_irqs_off |
| |
| #define deactivate_mm(tsk,mm) do { } while (0) |
| |
| 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. |
| */ |
| |
| BUG_ON(next == &init_mm); /* Should never happen */ |
| |
| if (next->context == 0) |
| next->context = alloc_sid(); |
| |
| switch_mm(prev,next,current); |
| } |
| #endif |