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1da177e4 LT |
1 | #ifndef __M68K_MMU_CONTEXT_H |
2 | #define __M68K_MMU_CONTEXT_H | |
3 | ||
1da177e4 LT |
4 | |
5 | static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk) | |
6 | { | |
7 | } | |
8 | ||
9 | #ifndef CONFIG_SUN3 | |
10 | ||
11 | #include <asm/setup.h> | |
12 | #include <asm/page.h> | |
13 | #include <asm/pgalloc.h> | |
14 | ||
15 | static inline int init_new_context(struct task_struct *tsk, | |
16 | struct mm_struct *mm) | |
17 | { | |
18 | mm->context = virt_to_phys(mm->pgd); | |
19 | return 0; | |
20 | } | |
21 | ||
22 | #define destroy_context(mm) do { } while(0) | |
23 | ||
24 | static inline void switch_mm_0230(struct mm_struct *mm) | |
25 | { | |
26 | unsigned long crp[2] = { | |
27 | 0x80000000 | _PAGE_TABLE, mm->context | |
28 | }; | |
29 | unsigned long tmp; | |
30 | ||
31 | asm volatile (".chip 68030"); | |
32 | ||
33 | /* flush MC68030/MC68020 caches (they are virtually addressed) */ | |
34 | asm volatile ( | |
35 | "movec %%cacr,%0;" | |
36 | "orw %1,%0; " | |
37 | "movec %0,%%cacr" | |
38 | : "=d" (tmp) : "di" (FLUSH_I_AND_D)); | |
39 | ||
40 | /* Switch the root pointer. For a 030-only kernel, | |
41 | * avoid flushing the whole ATC, we only need to | |
42 | * flush the user entries. The 68851 does this by | |
43 | * itself. Avoid a runtime check here. | |
44 | */ | |
45 | asm volatile ( | |
46 | #ifdef CPU_M68030_ONLY | |
47 | "pmovefd %0,%%crp; " | |
48 | "pflush #0,#4" | |
49 | #else | |
50 | "pmove %0,%%crp" | |
51 | #endif | |
52 | : : "m" (crp[0])); | |
53 | ||
54 | asm volatile (".chip 68k"); | |
55 | } | |
56 | ||
57 | static inline void switch_mm_0460(struct mm_struct *mm) | |
58 | { | |
59 | asm volatile (".chip 68040"); | |
60 | ||
61 | /* flush address translation cache (user entries) */ | |
62 | asm volatile ("pflushan"); | |
63 | ||
64 | /* switch the root pointer */ | |
65 | asm volatile ("movec %0,%%urp" : : "r" (mm->context)); | |
66 | ||
67 | if (CPU_IS_060) { | |
68 | unsigned long tmp; | |
69 | ||
70 | /* clear user entries in the branch cache */ | |
71 | asm volatile ( | |
72 | "movec %%cacr,%0; " | |
73 | "orl %1,%0; " | |
74 | "movec %0,%%cacr" | |
75 | : "=d" (tmp): "di" (0x00200000)); | |
76 | } | |
77 | ||
78 | asm volatile (".chip 68k"); | |
79 | } | |
80 | ||
81 | static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, struct task_struct *tsk) | |
82 | { | |
83 | if (prev != next) { | |
84 | if (CPU_IS_020_OR_030) | |
85 | switch_mm_0230(next); | |
86 | else | |
87 | switch_mm_0460(next); | |
88 | } | |
89 | } | |
90 | ||
91 | #define deactivate_mm(tsk,mm) do { } while (0) | |
92 | ||
93 | static inline void activate_mm(struct mm_struct *prev_mm, | |
94 | struct mm_struct *next_mm) | |
95 | { | |
96 | next_mm->context = virt_to_phys(next_mm->pgd); | |
97 | ||
98 | if (CPU_IS_020_OR_030) | |
99 | switch_mm_0230(next_mm); | |
100 | else | |
101 | switch_mm_0460(next_mm); | |
102 | } | |
103 | ||
104 | #else /* CONFIG_SUN3 */ | |
105 | #include <asm/sun3mmu.h> | |
106 | #include <linux/sched.h> | |
107 | ||
108 | extern unsigned long get_free_context(struct mm_struct *mm); | |
109 | extern void clear_context(unsigned long context); | |
110 | ||
111 | /* set the context for a new task to unmapped */ | |
112 | static inline int init_new_context(struct task_struct *tsk, struct mm_struct *mm) | |
113 | { | |
114 | mm->context = SUN3_INVALID_CONTEXT; | |
115 | return 0; | |
116 | } | |
117 | ||
118 | /* find the context given to this process, and if it hasn't already | |
119 | got one, go get one for it. */ | |
120 | static inline void get_mmu_context(struct mm_struct *mm) | |
121 | { | |
122 | if(mm->context == SUN3_INVALID_CONTEXT) | |
123 | mm->context = get_free_context(mm); | |
124 | } | |
125 | ||
126 | /* flush context if allocated... */ | |
127 | static inline void destroy_context(struct mm_struct *mm) | |
128 | { | |
129 | if(mm->context != SUN3_INVALID_CONTEXT) | |
130 | clear_context(mm->context); | |
131 | } | |
132 | ||
133 | static inline void activate_context(struct mm_struct *mm) | |
134 | { | |
135 | get_mmu_context(mm); | |
136 | sun3_put_context(mm->context); | |
137 | } | |
138 | ||
139 | static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, struct task_struct *tsk) | |
140 | { | |
141 | activate_context(tsk->mm); | |
142 | } | |
143 | ||
144 | #define deactivate_mm(tsk,mm) do { } while (0) | |
145 | ||
146 | static inline void activate_mm(struct mm_struct *prev_mm, | |
147 | struct mm_struct *next_mm) | |
148 | { | |
149 | activate_context(next_mm); | |
150 | } | |
151 | ||
152 | #endif | |
153 | #endif |