1 /* $NetBSD: memset.S,v 1.1 2005/12/20 19:28:49 christos Exp $ */
4 * Copyright 2003 Wasabi Systems, Inc.
7 * Written by Steve C. Woodford for Wasabi Systems, Inc.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 * must display the following acknowledgement:
19 * This product includes software developed for the NetBSD Project by
20 * Wasabi Systems, Inc.
21 * 4. The name of Wasabi Systems, Inc. may not be used to endorse
22 * or promote products derived from this software without specific prior
25 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
35 * POSSIBILITY OF SUCH DAMAGE.
38 * Copyright (c) 1995 Mark Brinicombe.
39 * All rights reserved.
41 * Redistribution and use in source and binary forms, with or without
42 * modification, are permitted provided that the following conditions
44 * 1. Redistributions of source code must retain the above copyright
45 * notice, this list of conditions and the following disclaimer.
46 * 2. Redistributions in binary form must reproduce the above copyright
47 * notice, this list of conditions and the following disclaimer in the
48 * documentation and/or other materials provided with the distribution.
49 * 3. All advertising materials mentioning features or use of this software
50 * must display the following acknowledgement:
51 * This product includes software developed by Mark Brinicombe.
52 * 4. The name of the company nor the name of the author may be used to
53 * endorse or promote products derived from this software without specific
54 * prior written permission.
56 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
57 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
58 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
59 * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
60 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
61 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
62 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
63 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
64 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
65 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
69 #include <machine/asm.h>
72 * memset: Sets a block of memory to the specified value
77 * r2 - number of bytes to write
83 /* LINTSTUB: Func: void bzero(void *, size_t) */
87 /* LINTSTUB: Func: void *memset(void *, int, size_t) */
89 and r3, r1, #0xff /* We deal with bytes */
92 cmp r1, #0x04 /* Do we have less than 4 bytes */
94 blt .Lmemset_lessthanfour
96 /* Ok first we will word align the address */
97 ands r2, ip, #0x03 /* Get the bottom two bits */
98 bne .Lmemset_wordunaligned /* The address is not word aligned */
100 /* We are now word aligned */
101 .Lmemset_wordaligned:
103 orr r3, r3, r3, lsl #8 /* Extend value to 16-bits */
106 tst ip, #0x04 /* Quad-align for Xscale */
111 orr r3, r3, r3, lsl #16 /* Extend value to 32-bits */
114 subne r1, r1, #0x04 /* Quad-align if necessary */
115 strne r3, [ip], #0x04
118 blt .Lmemset_loop4 /* If less than 16 then use words */
119 mov r2, r3 /* Duplicate data */
120 cmp r1, #0x80 /* If < 128 then skip the big loop */
123 /* Do 128 bytes at a time */
127 strged r2, [ip], #0x08
128 strged r2, [ip], #0x08
129 strged r2, [ip], #0x08
130 strged r2, [ip], #0x08
131 strged r2, [ip], #0x08
132 strged r2, [ip], #0x08
133 strged r2, [ip], #0x08
134 strged r2, [ip], #0x08
135 strged r2, [ip], #0x08
136 strged r2, [ip], #0x08
137 strged r2, [ip], #0x08
138 strged r2, [ip], #0x08
139 strged r2, [ip], #0x08
140 strged r2, [ip], #0x08
141 strged r2, [ip], #0x08
142 strged r2, [ip], #0x08
162 RETc(eq) /* Zero length so just exit */
164 add r1, r1, #0x80 /* Adjust for extra sub */
166 /* Do 32 bytes at a time */
170 strged r2, [ip], #0x08
171 strged r2, [ip], #0x08
172 strged r2, [ip], #0x08
173 strged r2, [ip], #0x08
181 RETc(eq) /* Zero length so just exit */
183 adds r1, r1, #0x10 /* Partially adjust for extra sub */
185 /* Deal with 16 bytes or more */
187 strged r2, [ip], #0x08
188 strged r2, [ip], #0x08
193 RETc(eq) /* Zero length so just exit */
195 addlt r1, r1, #0x10 /* Possibly adjust for extra sub */
197 /* We have at least 4 bytes so copy as words */
200 strge r3, [ip], #0x04
202 RETc(eq) /* Zero length so just exit */
205 /* Compensate for 64-bit alignment check */
213 strb r3, [ip], #0x01 /* Set 1 byte */
214 strgeb r3, [ip], #0x01 /* Set another byte */
215 strgtb r3, [ip] /* and a third */
218 .Lmemset_wordunaligned:
220 strb r3, [ip], #0x01 /* Set 1 byte */
222 strgeb r3, [ip], #0x01 /* Set another byte */
224 strgtb r3, [ip], #0x01 /* and a third */
225 cmp r1, #0x04 /* More than 4 bytes left? */
226 bge .Lmemset_wordaligned /* Yup */
228 .Lmemset_lessthanfour:
230 RETc(eq) /* Zero length so exit */
231 strb r3, [ip], #0x01 /* Set 1 byte */
233 strgeb r3, [ip], #0x01 /* Set another byte */
234 strgtb r3, [ip] /* and a third */