114 lines
2.6 KiB
C
114 lines
2.6 KiB
C
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#ifndef _ASM_SCORE_MMU_CONTEXT_H
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#define _ASM_SCORE_MMU_CONTEXT_H
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#include <linux/errno.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <asm-generic/mm_hooks.h>
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#include <asm/cacheflush.h>
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#include <asm/tlbflush.h>
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#include <asm/scoreregs.h>
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/*
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* For the fast tlb miss handlers, we keep a per cpu array of pointers
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* to the current pgd for each processor. Also, the proc. id is stuffed
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* into the context register.
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*/
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extern unsigned long asid_cache;
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extern unsigned long pgd_current;
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#define TLBMISS_HANDLER_SETUP_PGD(pgd) (pgd_current = (unsigned long)(pgd))
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#define TLBMISS_HANDLER_SETUP() \
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do { \
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write_c0_context(0); \
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TLBMISS_HANDLER_SETUP_PGD(swapper_pg_dir) \
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} while (0)
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/*
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* All unused by hardware upper bits will be considered
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* as a software asid extension.
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*/
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#define ASID_VERSION_MASK 0xfffff000
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#define ASID_FIRST_VERSION 0x1000
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/* PEVN --------- VPN ---------- --ASID--- -NA- */
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/* binary: 0000 0000 0000 0000 0000 0000 0001 0000 */
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/* binary: 0000 0000 0000 0000 0000 1111 1111 0000 */
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#define ASID_INC 0x10
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#define ASID_MASK 0xff0
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static inline void enter_lazy_tlb(struct mm_struct *mm,
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struct task_struct *tsk)
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{}
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static inline void
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get_new_mmu_context(struct mm_struct *mm)
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{
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unsigned long asid = asid_cache + ASID_INC;
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if (!(asid & ASID_MASK)) {
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local_flush_tlb_all(); /* start new asid cycle */
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if (!asid) /* fix version if needed */
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asid = ASID_FIRST_VERSION;
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}
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mm->context = asid;
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asid_cache = asid;
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}
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/*
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* Initialize the context related info for a new mm_struct
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* instance.
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*/
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static inline int
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init_new_context(struct task_struct *tsk, struct mm_struct *mm)
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{
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mm->context = 0;
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return 0;
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}
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static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
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struct task_struct *tsk)
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{
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unsigned long flags;
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local_irq_save(flags);
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if ((next->context ^ asid_cache) & ASID_VERSION_MASK)
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get_new_mmu_context(next);
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pevn_set(next->context);
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TLBMISS_HANDLER_SETUP_PGD(next->pgd);
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local_irq_restore(flags);
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}
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/*
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* Destroy context related info for an mm_struct that is about
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* to be put to rest.
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*/
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static inline void destroy_context(struct mm_struct *mm)
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{}
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static inline void
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deactivate_mm(struct task_struct *task, struct mm_struct *mm)
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{}
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/*
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* After we have set current->mm to a new value, this activates
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* the context for the new mm so we see the new mappings.
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*/
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static inline void
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activate_mm(struct mm_struct *prev, struct mm_struct *next)
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{
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unsigned long flags;
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local_irq_save(flags);
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get_new_mmu_context(next);
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pevn_set(next->context);
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TLBMISS_HANDLER_SETUP_PGD(next->pgd);
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local_irq_restore(flags);
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}
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#endif /* _ASM_SCORE_MMU_CONTEXT_H */
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