summaryrefslogtreecommitdiffstats
path: root/arch/m68k/include/asm/mmu_context_mm.h
blob: 894dacbcee145df5c79b147393c7282a9edfef06 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
#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
OpenPOWER on IntegriCloud