1 /* $NetBSD: memset.S,v 1.7 2013/12/02 21:21:33 joerg 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>
71 #if 0 && defined(__minix)
72 #if defined(__ARM_EABI__) && !defined(_BZERO)
79 STRONG_ALIAS(__aeabi_memset4, __aeabi_memset)
80 STRONG_ALIAS(__aeabi_memset8, __aeabi_memset)
87 STRONG_ALIAS(__aeabi_memclr4, __aeabi_memclr)
88 STRONG_ALIAS(__aeabi_memclr8, __aeabi_memclr)
90 #endif /* #if 0 && defined(__minix) */
93 * memset: Sets a block of memory to the specified value
98 * r2 - number of bytes to write
104 /* LINTSTUB: Func: void bzero(void *, size_t) */
109 /* LINTSTUB: Func: void *phys_memset(void *, int, size_t) */
112 /* LINTSTUB: Func: void *memset(void *, int, size_t) */
115 and r3, r1, #0xff /* We deal with bytes */
118 cmp r1, #0x04 /* Do we have less than 4 bytes */
120 blt .Lmemset_lessthanfour
122 /* Ok first we will word align the address */
123 ands r2, ip, #0x03 /* Get the bottom two bits */
124 bne .Lmemset_wordunaligned /* The address is not word aligned */
126 /* We are now word aligned */
127 .Lmemset_wordaligned:
129 orr r3, r3, r3, lsl #8 /* Extend value to 16-bits */
131 #ifdef _ARM_ARCH_DWORD_OK
132 tst ip, #0x04 /* Quad-align for Xscale */
137 orr r3, r3, r3, lsl #16 /* Extend value to 32-bits */
139 #ifdef _ARM_ARCH_DWORD_OK
140 subne r1, r1, #0x04 /* Quad-align if necessary */
141 strne r3, [ip], #0x04
144 blt .Lmemset_loop4 /* If less than 16 then use words */
145 mov r2, r3 /* Duplicate data */
146 cmp r1, #0x80 /* If < 128 then skip the big loop */
149 /* Do 128 bytes at a time */
152 #ifdef _ARM_ARCH_DWORD_OK
153 strdge r2, r3, [ip], #0x08
154 strdge r2, r3, [ip], #0x08
155 strdge r2, r3, [ip], #0x08
156 strdge r2, r3, [ip], #0x08
157 strdge r2, r3, [ip], #0x08
158 strdge r2, r3, [ip], #0x08
159 strdge r2, r3, [ip], #0x08
160 strdge r2, r3, [ip], #0x08
161 strdge r2, r3, [ip], #0x08
162 strdge r2, r3, [ip], #0x08
163 strdge r2, r3, [ip], #0x08
164 strdge r2, r3, [ip], #0x08
165 strdge r2, r3, [ip], #0x08
166 strdge r2, r3, [ip], #0x08
167 strdge r2, r3, [ip], #0x08
168 strdge r2, r3, [ip], #0x08
191 RETc(eq) /* Zero length so just exit */
193 add r1, r1, #0x80 /* Adjust for extra sub */
195 /* Do 32 bytes at a time */
198 #ifdef _ARM_ARCH_DWORD_OK
199 strdge r2, r3, [ip], #0x08
200 strdge r2, r3, [ip], #0x08
201 strdge r2, r3, [ip], #0x08
202 strdge r2, r3, [ip], #0x08
213 RETc(eq) /* Zero length so just exit */
215 adds r1, r1, #0x10 /* Partially adjust for extra sub */
217 /* Deal with 16 bytes or more */
218 #ifdef _ARM_ARCH_DWORD_OK
219 strdge r2, r3, [ip], #0x08
220 strdge r2, r3, [ip], #0x08
228 RETc(eq) /* Zero length so just exit */
230 addlt r1, r1, #0x10 /* Possibly adjust for extra sub */
232 /* We have at least 4 bytes so copy as words */
235 strge r3, [ip], #0x04
240 RETc(eq) /* Zero length so just exit */
242 #ifdef _ARM_ARCH_DWORD_OK
243 /* Compensate for 64-bit alignment check */
254 strb r3, [ip], #0x01 /* Set 1 byte */
255 strbge r3, [ip], #0x01 /* Set another byte */
256 strbgt r3, [ip] /* and a third */
262 .Lmemset_wordunaligned:
264 strb r3, [ip], #0x01 /* Set 1 byte */
266 strbge r3, [ip], #0x01 /* Set another byte */
268 strbgt r3, [ip], #0x01 /* and a third */
269 cmp r1, #0x04 /* More than 4 bytes left? */
270 bge .Lmemset_wordaligned /* Yup */
272 .Lmemset_lessthanfour:
277 RETc(eq) /* Zero length so exit */
278 strb r3, [ip], #0x01 /* Set 1 byte */
280 strbge r3, [ip], #0x01 /* Set another byte */
281 strbgt r3, [ip] /* and a third */
289 #if !defined(__minix)
297 LABEL(memset_fault) /* kernel can send us here */
301 LABEL(memset_fault_in_kernel) /* kernel can send us here */
302 mrc p15, 0, r0, c6, c0, 0 /* Read DFAR */