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 | * | |
| 6 | * The contents of this file constitute Original Code as defined in and | |
| 7 | * are subject to the Apple Public Source License Version 1.1 (the | |
| 8 | * "License"). You may not use this file except in compliance with the | |
| 9 | * License. Please obtain a copy of the License at | |
| 10 | * http://www.apple.com/publicsource and read it before using this file. | |
| 11 | * | |
| 12 | * This Original Code and all software distributed under the License are | |
| 13 | * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER | |
| 14 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, | |
| 15 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, | |
| 16 | * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the | |
| 17 | * License for the specific language governing rights and limitations | |
| 18 | * under the License. | |
| 19 | * | |
| 20 | * @APPLE_LICENSE_HEADER_END@ | |
| 21 | */ | |
| 22 | /* | |
| 23 | * @OSF_COPYRIGHT@ | |
| 24 | */ | |
| 25 | /* | |
| 26 | * Mach Operating System | |
| 27 | * Copyright (c) 1991,1990 Carnegie Mellon University | |
| 28 | * All Rights Reserved. | |
| 29 | * | |
| 30 | * Permission to use, copy, modify and distribute this software and its | |
| 31 | * documentation is hereby granted, provided that both the copyright | |
| 32 | * notice and this permission notice appear in all copies of the | |
| 33 | * software, derivative works or modified versions, and any portions | |
| 34 | * thereof, and that both notices appear in supporting documentation. | |
| 35 | * | |
| 36 | * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" | |
| 37 | * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR | |
| 38 | * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. | |
| 39 | * | |
| 40 | * Carnegie Mellon requests users of this software to return to | |
| 41 | * | |
| 42 | * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU | |
| 43 | * School of Computer Science | |
| 44 | * Carnegie Mellon University | |
| 45 | * Pittsburgh PA 15213-3890 | |
| 46 | * | |
| 47 | * any improvements or extensions that they make and grant Carnegie Mellon | |
| 48 | * the rights to redistribute these changes. | |
| 49 | */ | |
| 50 | /* | |
| 51 | */ | |
| 52 | ||
| 53 | #include <i386/asm.h> | |
| 54 | ||
| 55 | /* | |
| 56 | * void *memset(void * addr, int pattern, size_t length) | |
| 57 | */ | |
| 58 | ||
| 59 | ENTRY(memset) | |
| 60 | pushl %edi | |
| 61 | movl 4+ 4(%esp),%edi /* addr */ | |
| 62 | movb 4+ 8(%esp),%al /* pattern */ | |
| 63 | movl 4+ 12(%esp),%edx /* length */ | |
| 64 | movb %al,%ah | |
| 65 | movw %ax,%cx | |
| 66 | shll $16,%eax | |
| 67 | movw %cx,%ax | |
| 68 | cld | |
| 69 | /* zero longs */ | |
| 70 | movl %edx,%ecx | |
| 71 | shrl $2,%ecx | |
| 72 | rep | |
| 73 | stosl | |
| 74 | /* zero bytes */ | |
| 75 | movl %edx,%ecx | |
| 76 | andl $3,%ecx | |
| 77 | rep | |
| 78 | stosb | |
| 79 | movl 4+ 4(%esp),%eax /* returns its first argument */ | |
| 80 | popl %edi | |
| 81 | ret | |
| 82 | ||
| 83 | /* | |
| 84 | * void bzero(char * addr, unsigned int length) | |
| 85 | */ | |
| 86 | Entry(blkclr) | |
| 87 | ENTRY(bzero) | |
| 88 | pushl %edi | |
| 89 | movl 4+ 4(%esp),%edi /* addr */ | |
| 90 | movl 4+ 8(%esp),%edx /* length */ | |
| 91 | xorl %eax,%eax | |
| 92 | cld | |
| 93 | /* zero longs */ | |
| 94 | movl %edx,%ecx | |
| 95 | shrl $2,%ecx | |
| 96 | rep | |
| 97 | stosl | |
| 98 | /* zero bytes */ | |
| 99 | movl %edx,%ecx | |
| 100 | andl $3,%ecx | |
| 101 | rep | |
| 102 | stosb | |
| 103 | popl %edi | |
| 104 | ret |