#ifndef _ASM_M32R_MMU_CONTEXT_H #define _ASM_M32R_MMU_CONTEXT_H #ifdef __KERNEL__ #include <asm/m32r.h> #define MMU_CONTEXT_ASID_MASK (0x000000FF) #define MMU_CONTEXT_VERSION_MASK (0xFFFFFF00) #define MMU_CONTEXT_FIRST_VERSION (0x00000100) #define NO_CONTEXT (0x00000000) #ifndef __ASSEMBLY__ #include <asm/atomic.h> #include <asm/pgalloc.h> #include <asm/mmu.h> #include <asm/tlbflush.h> #include <asm-generic/mm_hooks.h> /* * Cache of MMU context last used. */ #ifndef CONFIG_SMP extern unsigned long mmu_context_cache_dat; #define mmu_context_cache mmu_context_cache_dat #define mm_context(mm) mm->context #else /* not CONFIG_SMP */ extern unsigned long mmu_context_cache_dat[]; #define mmu_context_cache mmu_context_cache_dat[smp_processor_id()] #define mm_context(mm) mm->context[smp_processor_id()] #endif /* not CONFIG_SMP */ #define set_tlb_tag(entry, tag) (*entry = (tag & PAGE_MASK)|get_asid()) #define set_tlb_data(entry, data) (*entry = (data | _PAGE_PRESENT)) #ifdef CONFIG_MMU #define enter_lazy_tlb(mm, tsk) do { } while (0) static inline void get_new_mmu_context(struct mm_struct *mm) { unsigned long mc = ++mmu_context_cache; if (!(mc & MMU_CONTEXT_ASID_MASK)) { /* We exhaust ASID of this version. Flush all TLB and start new cycle. */ local_flush_tlb_all(); /* Fix version if needed. Note that we avoid version #0 to distingush NO_CONTEXT. */ if (!mc) mmu_context_cache = mc = MMU_CONTEXT_FIRST_VERSION; } mm_context(mm) = mc; } /* * Get MMU context if needed. */ static inline void get_mmu_context(struct mm_struct *mm) { if (mm) { unsigned long mc = mmu_context_cache; /* Check if we have old version of context. If it's old, we need to get new context with new version. */ if ((mm_context(mm) ^ mc) & MMU_CONTEXT_VERSION_MASK) get_new_mmu_context(mm); } } /* * Initialize the context related info for a new mm_struct * instance. */ static inline int init_new_context(struct task_struct *tsk, struct mm_struct *mm) { #ifndef CONFIG_SMP mm->context = NO_CONTEXT; #else /* CONFIG_SMP */ int num_cpus = num_online_cpus(); int i; for (i = 0 ; i < num_cpus ; i++) mm->context[i] = NO_CONTEXT; #endif /* CONFIG_SMP */ return 0; } /* * Destroy context related info for an mm_struct that is about * to be put to rest. */ #define destroy_context(mm) do { } while (0) static inline void set_asid(unsigned long asid) { *(volatile unsigned long *)MASID = (asid & MMU_CONTEXT_ASID_MASK); } static inline unsigned long get_asid(void) { unsigned long asid; asid = *(volatile long *)MASID; asid &= MMU_CONTEXT_ASID_MASK; return asid; } /* * After we have set current->mm to a new value, this activates * the context for the new mm so we see the new mappings. */ static inline void activate_context(struct mm_struct *mm) { get_mmu_context(mm); set_asid(mm_context(mm) & MMU_CONTEXT_ASID_MASK); } static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, struct task_struct *tsk) { #ifdef CONFIG_SMP int cpu = smp_processor_id(); #endif /* CONFIG_SMP */ if (prev != next) { #ifdef CONFIG_SMP cpu_set(cpu, next->cpu_vm_mask); #endif /* CONFIG_SMP */ /* Set MPTB = next->pgd */ *(volatile unsigned long *)MPTB = (unsigned long)next->pgd; activate_context(next); } #ifdef CONFIG_SMP else if (!cpu_test_and_set(cpu, next->cpu_vm_mask)) activate_context(next); #endif /* CONFIG_SMP */ } #define deactivate_mm(tsk, mm) do { } while (0) #define activate_mm(prev, next) \ switch_mm((prev), (next), NULL) #else /* not CONFIG_MMU */ #define get_mmu_context(mm) do { } while (0) #define init_new_context(tsk,mm) (0) #define destroy_context(mm) do { } while (0) #define set_asid(asid) do { } while (0) #define get_asid() (0) #define activate_context(mm) do { } while (0) #define switch_mm(prev,next,tsk) do { } while (0) #define deactivate_mm(mm,tsk) do { } while (0) #define activate_mm(prev,next) do { } while (0) #define enter_lazy_tlb(mm,tsk) do { } while (0) #endif /* not CONFIG_MMU */ #endif /* not __ASSEMBLY__ */ #endif /* __KERNEL__ */ #endif /* _ASM_M32R_MMU_CONTEXT_H */