#ifndef __PARISC_MMU_CONTEXT_H #define __PARISC_MMU_CONTEXT_H #include <linux/mm.h> #include <linux/sched.h> #include <asm/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 void load_context(mm_context_t context) { mtsp(context, 3); #if SPACEID_SHIFT == 0 mtctl(context << 1,8); #else mtctl(context >> (SPACEID_SHIFT - 1),8); #endif } static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, struct task_struct *tsk) { if (prev != next) { mtctl(__pa(next->pgd), 25); load_context(next->context); } } #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