projects / apple / xnu.git / blame
| Commit | Line | Data |
|---|---|---|
| 1c79356b A |
1 | /* |
| 2 | * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. | |
| 3 | * | |
| 2d21ac55 | 4 | * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ |
| 8f6c56a5 | 5 | * |
| 2d21ac55 A |
6 | * This file contains Original Code and/or Modifications of Original Code |
| 7 | * as defined in and that are subject to the Apple Public Source License | |
| 8 | * Version 2.0 (the 'License'). You may not use this file except in | |
| 9 | * compliance with the License. The rights granted to you under the License | |
| 10 | * may not be used to create, or enable the creation or redistribution of, | |
| 11 | * unlawful or unlicensed copies of an Apple operating system, or to | |
| 12 | * circumvent, violate, or enable the circumvention or violation of, any | |
| 13 | * terms of an Apple operating system software license agreement. | |
| 8f6c56a5 | 14 | * |
| 2d21ac55 A |
15 | * Please obtain a copy of the License at |
| 16 | * http://www.opensource.apple.com/apsl/ and read it before using this file. | |
| 17 | * | |
| 18 | * The Original Code and all software distributed under the License are | |
| 19 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER | |
| 8f6c56a5 A |
20 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, |
| 21 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, | |
| 2d21ac55 A |
22 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. |
| 23 | * Please see the License for the specific language governing rights and | |
| 24 | * limitations under the License. | |
| 8f6c56a5 | 25 | * |
| 2d21ac55 | 26 | * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ |
| 1c79356b A |
27 | */ |
| 28 | /* | |
| 29 | * @OSF_COPYRIGHT@ | |
| 30 | */ | |
| 31 | /* | |
| 32 | * Mach Operating System | |
| 33 | * Copyright (c) 1991,1990 Carnegie Mellon University | |
| 34 | * All Rights Reserved. | |
| 35 | * | |
| 36 | * Permission to use, copy, modify and distribute this software and its | |
| 37 | * documentation is hereby granted, provided that both the copyright | |
| 38 | * notice and this permission notice appear in all copies of the | |
| 39 | * software, derivative works or modified versions, and any portions | |
| 40 | * thereof, and that both notices appear in supporting documentation. | |
| 41 | * | |
| 42 | * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" | |
| 43 | * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR | |
| 44 | * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. | |
| 45 | * | |
| 46 | * Carnegie Mellon requests users of this software to return to | |
| 47 | * | |
| 48 | * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU | |
| 49 | * School of Computer Science | |
| 50 | * Carnegie Mellon University | |
| 51 | * Pittsburgh PA 15213-3890 | |
| 52 | * | |
| 53 | * any improvements or extensions that they make and grant Carnegie Mellon | |
| 54 | * the rights to redistribute these changes. | |
| 55 | */ | |
| 56 | /* | |
| 57 | */ | |
| 58 | ||
| 59 | #include <i386/asm.h> | |
| 60 | ||
| 61 | /* | |
| 62 | * void *memset(void * addr, int pattern, size_t length) | |
| 63 | */ | |
| 64 | ||
| 65 | ENTRY(memset) | |
| 66 | pushl %edi | |
| 67 | movl 4+ 4(%esp),%edi /* addr */ | |
| 68 | movb 4+ 8(%esp),%al /* pattern */ | |
| 69 | movl 4+ 12(%esp),%edx /* length */ | |
| 70 | movb %al,%ah | |
| 71 | movw %ax,%cx | |
| 72 | shll $16,%eax | |
| 73 | movw %cx,%ax | |
| 74 | cld | |
| 75 | /* zero longs */ | |
| 76 | movl %edx,%ecx | |
| 77 | shrl $2,%ecx | |
| 78 | rep | |
| 79 | stosl | |
| 80 | /* zero bytes */ | |
| 81 | movl %edx,%ecx | |
| 82 | andl $3,%ecx | |
| 83 | rep | |
| 84 | stosb | |
| 85 | movl 4+ 4(%esp),%eax /* returns its first argument */ | |
| 86 | popl %edi | |
| 87 | ret | |
| 88 | ||
| 89 | /* | |
| b0d623f7 | 90 | * void bzero(char * addr, size_t length) |
| 1c79356b A |
91 | */ |
| 92 | Entry(blkclr) | |
| 93 | ENTRY(bzero) | |
| 94 | pushl %edi | |
| 95 | movl 4+ 4(%esp),%edi /* addr */ | |
| 96 | movl 4+ 8(%esp),%edx /* length */ | |
| 97 | xorl %eax,%eax | |
| 98 | cld | |
| 99 | /* zero longs */ | |
| 100 | movl %edx,%ecx | |
| 101 | shrl $2,%ecx | |
| 102 | rep | |
| 103 | stosl | |
| 104 | /* zero bytes */ | |
| 105 | movl %edx,%ecx | |
| 106 | andl $3,%ecx | |
| 107 | rep | |
| 108 | stosb | |
| 109 | popl %edi | |
| 110 | ret |