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