1 #ifndef __M68K_MMU_CONTEXT_H 2 #define __M68K_MMU_CONTEXT_H 3 4 #include <asm-generic/mm_hooks.h> 5 6 static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk) 7 { 8 } 9 10 #ifdef CONFIG_MMU 11 #ifndef CONFIG_SUN3 12 13 #include <asm/setup.h> 14 #include <asm/page.h> 15 #include <asm/pgalloc.h> 16 17 static inline int init_new_context(struct task_struct *tsk, 18 struct mm_struct *mm) 19 { 20 mm->context = virt_to_phys(mm->pgd); 21 return 0; 22 } 23 24 #define destroy_context(mm) do { } while(0) 25 26 static inline void switch_mm_0230(struct mm_struct *mm) 27 { 28 unsigned long crp[2] = { 29 0x80000000 | _PAGE_TABLE, mm->context 30 }; 31 unsigned long tmp; 32 33 asm volatile (".chip 68030"); 34 35 /* flush MC68030/MC68020 caches (they are virtually addressed) */ 36 asm volatile ( 37 "movec %%cacr,%0;" 38 "orw %1,%0; " 39 "movec %0,%%cacr" 40 : "=d" (tmp) : "di" (FLUSH_I_AND_D)); 41 42 /* Switch the root pointer. For a 030-only kernel, 43 * avoid flushing the whole ATC, we only need to 44 * flush the user entries. The 68851 does this by 45 * itself. Avoid a runtime check here. 46 */ 47 asm volatile ( 48 #ifdef CPU_M68030_ONLY 49 "pmovefd %0,%%crp; " 50 "pflush #0,#4" 51 #else 52 "pmove %0,%%crp" 53 #endif 54 : : "m" (crp[0])); 55 56 asm volatile (".chip 68k"); 57 } 58 59 static inline void switch_mm_0460(struct mm_struct *mm) 60 { 61 asm volatile (".chip 68040"); 62 63 /* flush address translation cache (user entries) */ 64 asm volatile ("pflushan"); 65 66 /* switch the root pointer */ 67 asm volatile ("movec %0,%%urp" : : "r" (mm->context)); 68 69 if (CPU_IS_060) { 70 unsigned long tmp; 71 72 /* clear user entries in the branch cache */ 73 asm volatile ( 74 "movec %%cacr,%0; " 75 "orl %1,%0; " 76 "movec %0,%%cacr" 77 : "=d" (tmp): "di" (0x00200000)); 78 } 79 80 asm volatile (".chip 68k"); 81 } 82 83 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, struct task_struct *tsk) 84 { 85 if (prev != next) { 86 if (CPU_IS_020_OR_030) 87 switch_mm_0230(next); 88 else 89 switch_mm_0460(next); 90 } 91 } 92 93 #define deactivate_mm(tsk,mm) do { } while (0) 94 95 static inline void activate_mm(struct mm_struct *prev_mm, 96 struct mm_struct *next_mm) 97 { 98 next_mm->context = virt_to_phys(next_mm->pgd); 99 100 if (CPU_IS_020_OR_030) 101 switch_mm_0230(next_mm); 102 else 103 switch_mm_0460(next_mm); 104 } 105 106 #else /* CONFIG_SUN3 */ 107 #include <asm/sun3mmu.h> 108 #include <linux/sched.h> 109 110 extern unsigned long get_free_context(struct mm_struct *mm); 111 extern void clear_context(unsigned long context); 112 113 /* set the context for a new task to unmapped */ 114 static inline int init_new_context(struct task_struct *tsk, struct mm_struct *mm) 115 { 116 mm->context = SUN3_INVALID_CONTEXT; 117 return 0; 118 } 119 120 /* find the context given to this process, and if it hasn't already 121 got one, go get one for it. */ 122 static inline void get_mmu_context(struct mm_struct *mm) 123 { 124 if(mm->context == SUN3_INVALID_CONTEXT) 125 mm->context = get_free_context(mm); 126 } 127 128 /* flush context if allocated... */ 129 static inline void destroy_context(struct mm_struct *mm) 130 { 131 if(mm->context != SUN3_INVALID_CONTEXT) 132 clear_context(mm->context); 133 } 134 135 static inline void activate_context(struct mm_struct *mm) 136 { 137 get_mmu_context(mm); 138 sun3_put_context(mm->context); 139 } 140 141 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, struct task_struct *tsk) 142 { 143 activate_context(tsk->mm); 144 } 145 146 #define deactivate_mm(tsk,mm) do { } while (0) 147 148 static inline void activate_mm(struct mm_struct *prev_mm, 149 struct mm_struct *next_mm) 150 { 151 activate_context(next_mm); 152 } 153 154 #endif 155 #else /* !CONFIG_MMU */ 156 157 static inline int init_new_context(struct task_struct *tsk, struct mm_struct *mm) 158 { 159 return 0; 160 } 161 162 163 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, struct task_struct *tsk) 164 { 165 } 166 167 #define destroy_context(mm) do { } while (0) 168 #define deactivate_mm(tsk,mm) do { } while (0) 169 170 static inline void activate_mm(struct mm_struct *prev_mm, struct mm_struct *next_mm) 171 { 172 } 173 174 #endif /* CONFIG_MMU */ 175 #endif /* __M68K_MMU_CONTEXT_H */ 176