projects / apple / xnu.git / blame
| Commit | Line | Data |
|---|---|---|
| 1c79356b A |
1 | /* |
| 2 | * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. | |
| 3 | * | |
| 4 | * @APPLE_LICENSE_HEADER_START@ | |
| 5 | * | |
| 43866e37 A |
6 | * Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved. |
| 7 | * | |
| 8 | * This file contains Original Code and/or Modifications of Original Code | |
| 9 | * as defined in and that are subject to the Apple Public Source License | |
| 10 | * Version 2.0 (the 'License'). You may not use this file except in | |
| 11 | * compliance with the License. Please obtain a copy of the License at | |
| 12 | * http://www.opensource.apple.com/apsl/ and read it before using this | |
| 13 | * file. | |
| 14 | * | |
| 15 | * The Original Code and all software distributed under the License are | |
| 16 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER | |
| 1c79356b A |
17 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, |
| 18 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, | |
| 43866e37 A |
19 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. |
| 20 | * Please see the License for the specific language governing rights and | |
| 21 | * limitations under the License. | |
| 1c79356b A |
22 | * |
| 23 | * @APPLE_LICENSE_HEADER_END@ | |
| 24 | */ | |
| 25 | /* | |
| 26 | * @OSF_COPYRIGHT@ | |
| 27 | */ | |
| 28 | /* | |
| 29 | * Mach Operating System | |
| 30 | * Copyright (c) 1991,1990 Carnegie Mellon University | |
| 31 | * All Rights Reserved. | |
| 32 | * | |
| 33 | * Permission to use, copy, modify and distribute this software and its | |
| 34 | * documentation is hereby granted, provided that both the copyright | |
| 35 | * notice and this permission notice appear in all copies of the | |
| 36 | * software, derivative works or modified versions, and any portions | |
| 37 | * thereof, and that both notices appear in supporting documentation. | |
| 38 | * | |
| 39 | * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" | |
| 40 | * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR | |
| 41 | * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. | |
| 42 | * | |
| 43 | * Carnegie Mellon requests users of this software to return to | |
| 44 | * | |
| 45 | * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU | |
| 46 | * School of Computer Science | |
| 47 | * Carnegie Mellon University | |
| 48 | * Pittsburgh PA 15213-3890 | |
| 49 | * | |
| 50 | * any improvements or extensions that they make and grant Carnegie Mellon | |
| 51 | * the rights to redistribute these changes. | |
| 52 | */ | |
| 53 | /* | |
| 54 | */ | |
| 55 | ||
| 56 | #include <i386/asm.h> | |
| 57 | ||
| 58 | /* | |
| 59 | * void *memset(void * addr, int pattern, size_t length) | |
| 60 | */ | |
| 61 | ||
| 62 | ENTRY(memset) | |
| 63 | pushl %edi | |
| 64 | movl 4+ 4(%esp),%edi /* addr */ | |
| 65 | movb 4+ 8(%esp),%al /* pattern */ | |
| 66 | movl 4+ 12(%esp),%edx /* length */ | |
| 67 | movb %al,%ah | |
| 68 | movw %ax,%cx | |
| 69 | shll $16,%eax | |
| 70 | movw %cx,%ax | |
| 71 | cld | |
| 72 | /* zero longs */ | |
| 73 | movl %edx,%ecx | |
| 74 | shrl $2,%ecx | |
| 75 | rep | |
| 76 | stosl | |
| 77 | /* zero bytes */ | |
| 78 | movl %edx,%ecx | |
| 79 | andl $3,%ecx | |
| 80 | rep | |
| 81 | stosb | |
| 82 | movl 4+ 4(%esp),%eax /* returns its first argument */ | |
| 83 | popl %edi | |
| 84 | ret | |
| 85 | ||
| 86 | /* | |
| 87 | * void bzero(char * addr, unsigned int length) | |
| 88 | */ | |
| 89 | Entry(blkclr) | |
| 90 | ENTRY(bzero) | |
| 91 | pushl %edi | |
| 92 | movl 4+ 4(%esp),%edi /* addr */ | |
| 93 | movl 4+ 8(%esp),%edx /* length */ | |
| 94 | xorl %eax,%eax | |
| 95 | cld | |
| 96 | /* zero longs */ | |
| 97 | movl %edx,%ecx | |
| 98 | shrl $2,%ecx | |
| 99 | rep | |
| 100 | stosl | |
| 101 | /* zero bytes */ | |
| 102 | movl %edx,%ecx | |
| 103 | andl $3,%ecx | |
| 104 | rep | |
| 105 | stosb | |
| 106 | popl %edi | |
| 107 | ret |