summaryrefslogtreecommitdiffstats
path: root/arch/arm64/mm/cache.S
blob: 58b5a906ff786781dfeae9155865345181c585e2 (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
/*
 * Cache maintenance
 *
 * Copyright (C) 2001 Deep Blue Solutions Ltd.
 * Copyright (C) 2012 ARM Ltd.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <linux/errno.h>
#include <linux/linkage.h>
#include <linux/init.h>
#include <asm/assembler.h>
#include <asm/cpufeature.h>
#include <asm/alternative.h>

/*
 *	flush_icache_range(start,end)
 *
 *	Ensure that the I and D caches are coherent within specified region.
 *	This is typically used when code has been written to a memory region,
 *	and will be executed.
 *
 *	- start   - virtual start address of region
 *	- end     - virtual end address of region
 */
ENTRY(flush_icache_range)
	/* FALLTHROUGH */

/*
 *	__flush_cache_user_range(start,end)
 *
 *	Ensure that the I and D caches are coherent within specified region.
 *	This is typically used when code has been written to a memory region,
 *	and will be executed.
 *
 *	- start   - virtual start address of region
 *	- end     - virtual end address of region
 */
ENTRY(__flush_cache_user_range)
	dcache_line_size x2, x3
	sub	x3, x2, #1
	bic	x4, x0, x3
1:
user_alt 9f, "dc cvau, x4",  "dc civac, x4",  ARM64_WORKAROUND_CLEAN_CACHE
	add	x4, x4, x2
	cmp	x4, x1
	b.lo	1b
	dsb	ish

	icache_line_size x2, x3
	sub	x3, x2, #1
	bic	x4, x0, x3
1:
USER(9f, ic	ivau, x4	)		// invalidate I line PoU
	add	x4, x4, x2
	cmp	x4, x1
	b.lo	1b
	dsb	ish
	isb
	mov	x0, #0
	ret
9:
	mov	x0, #-EFAULT
	ret
ENDPROC(flush_icache_range)
ENDPROC(__flush_cache_user_range)

/*
 *	__flush_dcache_area(kaddr, size)
 *
 *	Ensure that any D-cache lines for the interval [kaddr, kaddr+size)
 *	are cleaned and invalidated to the PoC.
 *
 *	- kaddr   - kernel address
 *	- size    - size in question
 */
ENTRY(__flush_dcache_area)
	dcache_by_line_op civac, sy, x0, x1, x2, x3
	ret
ENDPIPROC(__flush_dcache_area)

/*
 *	__clean_dcache_area_pou(kaddr, size)
 *
 * 	Ensure that any D-cache lines for the interval [kaddr, kaddr+size)
 * 	are cleaned to the PoU.
 *
 *	- kaddr   - kernel address
 *	- size    - size in question
 */
ENTRY(__clean_dcache_area_pou)
	dcache_by_line_op cvau, ish, x0, x1, x2, x3
	ret
ENDPROC(__clean_dcache_area_pou)

/*
 *	__dma_inv_area(start, size)
 *	- start   - virtual start address of region
 *	- size    - size in question
 */
__dma_inv_area:
	add	x1, x1, x0
	/* FALLTHROUGH */

/*
 *	__inval_cache_range(start, end)
 *	- start   - start address of region
 *	- end     - end address of region
 */
ENTRY(__inval_cache_range)
	dcache_line_size x2, x3
	sub	x3, x2, #1
	tst	x1, x3				// end cache line aligned?
	bic	x1, x1, x3
	b.eq	1f
	dc	civac, x1			// clean & invalidate D / U line
1:	tst	x0, x3				// start cache line aligned?
	bic	x0, x0, x3
	b.eq	2f
	dc	civac, x0			// clean & invalidate D / U line
	b	3f
2:	dc	ivac, x0			// invalidate D / U line
3:	add	x0, x0, x2
	cmp	x0, x1
	b.lo	2b
	dsb	sy
	ret
ENDPIPROC(__inval_cache_range)
ENDPROC(__dma_inv_area)

/*
 *	__clean_dcache_area_poc(kaddr, size)
 *
 * 	Ensure that any D-cache lines for the interval [kaddr, kaddr+size)
 * 	are cleaned to the PoC.
 *
 *	- kaddr   - kernel address
 *	- size    - size in question
 */
ENTRY(__clean_dcache_area_poc)
	/* FALLTHROUGH */

/*
 *	__dma_clean_area(start, size)
 *	- start   - virtual start address of region
 *	- size    - size in question
 */
__dma_clean_area:
	dcache_by_line_op cvac, sy, x0, x1, x2, x3
	ret
ENDPIPROC(__clean_dcache_area_poc)
ENDPROC(__dma_clean_area)

/*
 *	__dma_flush_area(start, size)
 *
 *	clean & invalidate D / U line
 *
 *	- start   - virtual start address of region
 *	- size    - size in question
 */
ENTRY(__dma_flush_area)
	dcache_by_line_op civac, sy, x0, x1, x2, x3
	ret
ENDPIPROC(__dma_flush_area)

/*
 *	__dma_map_area(start, size, dir)
 *	- start	- kernel virtual start address
 *	- size	- size of region
 *	- dir	- DMA direction
 */
ENTRY(__dma_map_area)
	cmp	w2, #DMA_FROM_DEVICE
	b.eq	__dma_inv_area
	b	__dma_clean_area
ENDPIPROC(__dma_map_area)

/*
 *	__dma_unmap_area(start, size, dir)
 *	- start	- kernel virtual start address
 *	- size	- size of region
 *	- dir	- DMA direction
 */
ENTRY(__dma_unmap_area)
	cmp	w2, #DMA_TO_DEVICE
	b.ne	__dma_inv_area
	ret
ENDPIPROC(__dma_unmap_area)