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- #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;
- 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
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