tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * arch/xtensa/mm/misc.S
3 *
4 * Miscellaneous assembly functions.
5 *
6 * This file is subject to the terms and conditions of the GNU General Public
7 * License. See the file "COPYING" in the main directory of this archive
8 * for more details.
9 *
10 * Copyright (C) 2001 - 2005 Tensilica Inc.
11 *
12 * Chris Zankel <chris@zankel.net>
13 */
14
15/* Note: we might want to implement some of the loops as zero-overhead-loops,
16 * where applicable and if supported by the processor.
17 */
18
19#include <linux/linkage.h>
20#include <asm/page.h>
21#include <asm/pgtable.h>
22#include <asm/asmmacro.h>
23#include <asm/cacheasm.h>
24
25/* clear_page (page) */
26
27ENTRY(clear_page)
28 entry a1, 16
29 addi a4, a2, PAGE_SIZE
30 movi a3, 0
31
321: s32i a3, a2, 0
33 s32i a3, a2, 4
34 s32i a3, a2, 8
35 s32i a3, a2, 12
36 s32i a3, a2, 16
37 s32i a3, a2, 20
38 s32i a3, a2, 24
39 s32i a3, a2, 28
40 addi a2, a2, 32
41 blt a2, a4, 1b
42
43 retw
44
45/*
46 * copy_page (void *to, void *from)
47 * a2 a3
48 */
49
50ENTRY(copy_page)
51 entry a1, 16
52 addi a4, a2, PAGE_SIZE
53
541: l32i a5, a3, 0
55 l32i a6, a3, 4
56 l32i a7, a3, 8
57 s32i a5, a2, 0
58 s32i a6, a2, 4
59 s32i a7, a2, 8
60 l32i a5, a3, 12
61 l32i a6, a3, 16
62 l32i a7, a3, 20
63 s32i a5, a2, 12
64 s32i a6, a2, 16
65 s32i a7, a2, 20
66 l32i a5, a3, 24
67 l32i a6, a3, 28
68 s32i a5, a2, 24
69 s32i a6, a2, 28
70 addi a2, a2, 32
71 addi a3, a3, 32
72 blt a2, a4, 1b
73
74 retw
75
76/*
77 * void __invalidate_icache_page(ulong start)
78 */
79
80ENTRY(__invalidate_icache_page)
81 entry sp, 16
82
83 ___invalidate_icache_page a2 a3
84 isync
85
86 retw
87
88/*
89 * void __invalidate_dcache_page(ulong start)
90 */
91
92ENTRY(__invalidate_dcache_page)
93 entry sp, 16
94
95 ___invalidate_dcache_page a2 a3
96 dsync
97
98 retw
99
100/*
101 * void __flush_invalidate_dcache_page(ulong start)
102 */
103
104ENTRY(__flush_invalidate_dcache_page)
105 entry sp, 16
106
107 ___flush_invalidate_dcache_page a2 a3
108
109 dsync
110 retw
111
112/*
113 * void __flush_dcache_page(ulong start)
114 */
115
116ENTRY(__flush_dcache_page)
117 entry sp, 16
118
119 ___flush_dcache_page a2 a3
120
121 dsync
122 retw
123
124
125
126/*
127 * void __invalidate_icache_range(ulong start, ulong size)
128 */
129
130ENTRY(__invalidate_icache_range)
131 entry sp, 16
132
133 ___invalidate_icache_range a2 a3 a4
134 isync
135
136 retw
137
138/*
139 * void __flush_invalidate_dcache_range(ulong start, ulong size)
140 */
141
142ENTRY(__flush_invalidate_dcache_range)
143 entry sp, 16
144
145 ___flush_invalidate_dcache_range a2 a3 a4
146 dsync
147
148 retw
149
150/*
151 * void _flush_dcache_range(ulong start, ulong size)
152 */
153
154ENTRY(__flush_dcache_range)
155 entry sp, 16
156
157 ___flush_dcache_range a2 a3 a4
158 dsync
159
160 retw
161
162/*
163 * void _invalidate_dcache_range(ulong start, ulong size)
164 */
165
166ENTRY(__invalidate_dcache_range)
167 entry sp, 16
168
169 ___invalidate_dcache_range a2 a3 a4
170
171
172 retw
173
174/*
175 * void _invalidate_icache_all(void)
176 */
177
178ENTRY(__invalidate_icache_all)
179 entry sp, 16
180
181 ___invalidate_icache_all a2 a3
182 isync
183
184 retw
185
186/*
187 * void _flush_invalidate_dcache_all(void)
188 */
189
190ENTRY(__flush_invalidate_dcache_all)
191 entry sp, 16
192
193 ___flush_invalidate_dcache_all a2 a3
194 dsync
195
196 retw
197
198/*
199 * void _invalidate_dcache_all(void)
200 */
201
202ENTRY(__invalidate_dcache_all)
203 entry sp, 16
204
205 ___invalidate_dcache_all a2 a3
206 dsync
207
208 retw
209