1/* 2 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. 3 * 4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5 * 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. 14 * 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 20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 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. 25 * 26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 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 65ENTRY(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/* 90 * void bzero(char * addr, unsigned int length) 91 */ 92Entry(blkclr) 93ENTRY(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 111