summaryrefslogtreecommitdiffstats
path: root/arch/m68k/include/asm/tlbflush_mm.h
blob: acb6bf21a321368024034a7678ad24f824e32bd6 (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
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
#ifndef _M68K_TLBFLUSH_H
#define _M68K_TLBFLUSH_H


#ifndef CONFIG_SUN3

#include <asm/current.h>

static inline void flush_tlb_kernel_page(void *addr)
{
	if (CPU_IS_040_OR_060) {
		mm_segment_t old_fs = get_fs();
		set_fs(KERNEL_DS);
		__asm__ __volatile__(".chip 68040\n\t"
				     "pflush (%0)\n\t"
				     ".chip 68k"
				     : : "a" (addr));
		set_fs(old_fs);
	} else if (CPU_IS_020_OR_030)
		__asm__ __volatile__("pflush #4,#4,(%0)" : : "a" (addr));
}

/*
 * flush all user-space atc entries.
 */
static inline void __flush_tlb(void)
{
	if (CPU_IS_040_OR_060)
		__asm__ __volatile__(".chip 68040\n\t"
				     "pflushan\n\t"
				     ".chip 68k");
	else if (CPU_IS_020_OR_030)
		__asm__ __volatile__("pflush #0,#4");
}

static inline void __flush_tlb040_one(unsigned long addr)
{
	__asm__ __volatile__(".chip 68040\n\t"
			     "pflush (%0)\n\t"
			     ".chip 68k"
			     : : "a" (addr));
}

static inline void __flush_tlb_one(unsigned long addr)
{
	if (CPU_IS_040_OR_060)
		__flush_tlb040_one(addr);
	else if (CPU_IS_020_OR_030)
		__asm__ __volatile__("pflush #0,#4,(%0)" : : "a" (addr));
}

#define flush_tlb() __flush_tlb()

/*
 * flush all atc entries (both kernel and user-space entries).
 */
static inline void flush_tlb_all(void)
{
	if (CPU_IS_040_OR_060)
		__asm__ __volatile__(".chip 68040\n\t"
				     "pflusha\n\t"
				     ".chip 68k");
	else if (CPU_IS_020_OR_030)
		__asm__ __volatile__("pflusha");
}

static inline void flush_tlb_mm(struct mm_struct *mm)
{
	if (mm == current->active_mm)
		__flush_tlb();
}

static inline void flush_tlb_page(struct vm_area_struct *vma, unsigned long addr)
{
	if (vma->vm_mm == current->active_mm) {
		mm_segment_t old_fs = get_fs();
		set_fs(USER_DS);
		__flush_tlb_one(addr);
		set_fs(old_fs);
	}
}

static inline void flush_tlb_range(struct vm_area_struct *vma,
				   unsigned long start, unsigned long end)
{
	if (vma->vm_mm == current->active_mm)
		__flush_tlb();
}

static inline void flush_tlb_kernel_range(unsigned long start, unsigned long end)
{
	flush_tlb_all();
}

#else


/* Reserved PMEGs. */
extern char sun3_reserved_pmeg[SUN3_PMEGS_NUM];
extern unsigned long pmeg_vaddr[SUN3_PMEGS_NUM];
extern unsigned char pmeg_alloc[SUN3_PMEGS_NUM];
extern unsigned char pmeg_ctx[SUN3_PMEGS_NUM];

/* Flush all userspace mappings one by one...  (why no flush command,
   sun?) */
static inline void flush_tlb_all(void)
{
       unsigned long addr;
       unsigned char ctx, oldctx;

       oldctx = sun3_get_context();
       for(addr = 0x00000000; addr < TASK_SIZE; addr += SUN3_PMEG_SIZE) {
	       for(ctx = 0; ctx < 8; ctx++) {
		       sun3_put_context(ctx);
		       sun3_put_segmap(addr, SUN3_INVALID_PMEG);
	       }
       }

       sun3_put_context(oldctx);
       /* erase all of the userspace pmeg maps, we've clobbered them
	  all anyway */
       for(addr = 0; addr < SUN3_INVALID_PMEG; addr++) {
	       if(pmeg_alloc[addr] == 1) {
		       pmeg_alloc[addr] = 0;
		       pmeg_ctx[addr] = 0;
		       pmeg_vaddr[addr] = 0;
	       }
       }

}

/* Clear user TLB entries within the context named in mm */
static inline void flush_tlb_mm (struct mm_struct *mm)
{
     unsigned char oldctx;
     unsigned char seg;
     unsigned long i;

     oldctx = sun3_get_context();
     sun3_put_context(mm->context);

     for(i = 0; i < TASK_SIZE; i += SUN3_PMEG_SIZE) {
	     seg = sun3_get_segmap(i);
	     if(seg == SUN3_INVALID_PMEG)
		     continue;

	     sun3_put_segmap(i, SUN3_INVALID_PMEG);
	     pmeg_alloc[seg] = 0;
	     pmeg_ctx[seg] = 0;
	     pmeg_vaddr[seg] = 0;
     }

     sun3_put_context(oldctx);

}

/* Flush a single TLB page. In this case, we're limited to flushing a
   single PMEG */
static inline void flush_tlb_page (struct vm_area_struct *vma,
				   unsigned long addr)
{
	unsigned char oldctx;
	unsigned char i;

	oldctx = sun3_get_context();
	sun3_put_context(vma->vm_mm->context);
	addr &= ~SUN3_PMEG_MASK;
	if((i = sun3_get_segmap(addr)) != SUN3_INVALID_PMEG)
	{
		pmeg_alloc[i] = 0;
		pmeg_ctx[i] = 0;
		pmeg_vaddr[i] = 0;
		sun3_put_segmap (addr,  SUN3_INVALID_PMEG);
	}
	sun3_put_context(oldctx);

}
/* Flush a range of pages from TLB. */

static inline void flush_tlb_range (struct vm_area_struct *vma,
		      unsigned long start, unsigned long end)
{
	struct mm_struct *mm = vma->vm_mm;
	unsigned char seg, oldctx;

	start &= ~SUN3_PMEG_MASK;

	oldctx = sun3_get_context();
	sun3_put_context(mm->context);

	while(start < end)
	{
		if((seg = sun3_get_segmap(start)) == SUN3_INVALID_PMEG)
		     goto next;
		if(pmeg_ctx[seg] == mm->context) {
			pmeg_alloc[seg] = 0;
			pmeg_ctx[seg] = 0;
			pmeg_vaddr[seg] = 0;
		}
		sun3_put_segmap(start, SUN3_INVALID_PMEG);
	next:
		start += SUN3_PMEG_SIZE;
	}
}

static inline void flush_tlb_kernel_range(unsigned long start, unsigned long end)
{
	flush_tlb_all();
}

/* Flush kernel page from TLB. */
static inline void flush_tlb_kernel_page (unsigned long addr)
{
	sun3_put_segmap (addr & ~(SUN3_PMEG_SIZE - 1), SUN3_INVALID_PMEG);
}

#endif

#endif /* _M68K_TLBFLUSH_H */
OpenPOWER on IntegriCloud