#ifndef __M68K_MMU_CONTEXT_H #define __M68K_MMU_CONTEXT_H #include <asm-generic/mm_hooks.h> static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk) { } #ifndef CONFIG_SUN3 #include <asm/setup.h> #include <asm/page.h> #include <asm/pgalloc.h> static inline int init_new_context(struct task_struct *tsk, struct mm_struct *mm) { mm->context = virt_to_phys(mm->pgd); return 0; } #define destroy_context(mm) do { } while(0) static inline void switch_mm_0230(struct mm_struct *mm) { unsigned long crp[2] = { 0x80000000 | _PAGE_TABLE, mm->context }; unsigned long tmp; asm volatile (".chip 68030"); /* flush MC68030/MC68020 caches (they are virtually addressed) */ asm volatile ( "movec %%cacr,%0;" "orw %1,%0; " "movec %0,%%cacr" : "=d" (tmp) : "di" (FLUSH_I_AND_D)); /* Switch the root pointer. For a 030-only kernel, * avoid flushing the whole ATC, we only need to * flush the user entries. The 68851 does this by * itself. Avoid a runtime check here. */ asm volatile ( #ifdef CPU_M68030_ONLY "pmovefd %0,%%crp; " "pflush #0,#4" #else "pmove %0,%%crp" #endif : : "m" (crp[0])); asm volatile (".chip 68k"); } static inline void switch_mm_0460(struct mm_struct *mm) { asm volatile (".chip 68040"); /* flush address translation cache (user entries) */ asm volatile ("pflushan"); /* switch the root pointer */ asm volatile ("movec %0,%%urp" : : "r" (mm->context)); if (CPU_IS_060) { unsigned long tmp; /* clear user entries in the branch cache */ asm volatile ( "movec %%cacr,%0; " "orl %1,%0; " "movec %0,%%cacr" : "=d" (tmp): "di" (0x00200000)); } asm volatile (".chip 68k"); } static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, struct task_struct *tsk) { if (prev != next) { if (CPU_IS_020_OR_030) switch_mm_0230(next); else switch_mm_0460(next); } } #define deactivate_mm(tsk,mm) do { } while (0) static inline void activate_mm(struct mm_struct *prev_mm, struct mm_struct *next_mm) { next_mm->context = virt_to_phys(next_mm->pgd); if (CPU_IS_020_OR_030) switch_mm_0230(next_mm); else switch_mm_0460(next_mm); } #else /* CONFIG_SUN3 */ #include <asm/sun3mmu.h> #include <linux/sched.h> extern unsigned long get_free_context(struct mm_struct *mm); extern void clear_context(unsigned long context); /* set the context for a new task to unmapped */ static inline int init_new_context(struct task_struct *tsk, struct mm_struct *mm) { mm->context = SUN3_INVALID_CONTEXT; return 0; } /* find the context given to this process, and if it hasn't already got one, go get one for it. */ static inline void get_mmu_context(struct mm_struct *mm) { if(mm->context == SUN3_INVALID_CONTEXT) mm->context = get_free_context(mm); } /* flush context if allocated... */ static inline void destroy_context(struct mm_struct *mm) { if(mm->context != SUN3_INVALID_CONTEXT) clear_context(mm->context); } static inline void activate_context(struct mm_struct *mm) { get_mmu_context(mm); sun3_put_context(mm->context); } static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, struct task_struct *tsk) { activate_context(tsk->mm); } #define deactivate_mm(tsk,mm) do { } while (0) static inline void activate_mm(struct mm_struct *prev_mm, struct mm_struct *next_mm) { activate_context(next_mm); } #endif #endif