[apple/xnu.git] / osfmk / x86_64 / bzero.s

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 * 
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */
 /*
 * @OSF_COPYRIGHT@
 */
/* 
 * Mach Operating System
 * Copyright (c) 1991,1990 Carnegie Mellon University
 * All Rights Reserved.
 * 
 * Permission to use, copy, modify and distribute this software and its
 * documentation is hereby granted, provided that both the copyright
 * notice and this permission notice appear in all copies of the
 * software, derivative works or modified versions, and any portions
 * thereof, and that both notices appear in supporting documentation.
 * 
 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
 * 
 * Carnegie Mellon requests users of this software to return to
 * 
 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
 *  School of Computer Science
 *  Carnegie Mellon University
 *  Pittsburgh PA 15213-3890
 * 
 * any improvements or extensions that they make and grant Carnegie Mellon
 * the rights to redistribute these changes.
 */
/*
 */

#include <i386/asm.h>

/*
 * void *memset(void * addr, int pattern, size_t length)
 */

ENTRY(memset)
	movq	%rdi, %r8
	movq	%rsi, %rax		/* move pattern (arg2) to rax */
	movb	%al,%ah			/* fill out pattern */
	movw	%ax,%cx
	shll	$16,%eax
	movw	%cx,%ax	
	mov		%eax, %ecx
	shlq	$32,%rax
	orq		%rcx, %rax 
	cld						/* reset direction flag */
	movq 	%rdx, %rcx		/* mov quads first */
	shrq	$3, %rcx
	rep
	stosq
	movq	%rdx,%rcx		/* mov bytes */
	andq	$7,%rcx
	rep
	stosb
	movq	%r8 ,%rax		/* returns its first argument */
	ret

/*
 * void bzero(char * addr, size_t length)
 */
Entry(blkclr)
ENTRY2(bzero,__bzero)
	movq	%rsi,%rcx
	xorq	%rax,%rax
	shrq	$3,%rcx
	cld
	rep
	stosq
	movq	%rsi,%rcx
	andq	$7,%rcx
	rep
	stosb
	ret
Commit	Line	Data
1c79356b A	1	/*
	2	* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
	3	*
2d21ac55	4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
1c79356b	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,
8f6c56a5 A	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	27	*/
b0d623f7	28	/*
1c79356b A	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
b0d623f7 A	59	#include <i386/asm.h>
b0d623f7 A	60
1c79356b	61	/*
b0d623f7	62	* void memset(void addr, int pattern, size_t length)
1c79356b	63	*/
1c79356b	64
b0d623f7 A	65	ENTRY(memset)
	66	movq %rdi, %r8
	67	movq %rsi, %rax /* move pattern (arg2) to rax */
	68	movb %al,%ah /* fill out pattern */
	69	movw %ax,%cx
	70	shll $16,%eax
	71	movw %cx,%ax
	72	mov %eax, %ecx
	73	shlq $32,%rax
	74	orq %rcx, %rax
	75	cld /* reset direction flag */
	76	movq %rdx, %rcx /* mov quads first */
	77	shrq $3, %rcx
	78	rep
	79	stosq
	80	movq %rdx,%rcx /* mov bytes */
	81	andq $7,%rcx
	82	rep
	83	stosb
	84	movq %r8 ,%rax /* returns its first argument */
	85	ret
1c79356b	86
b0d623f7 A	87	/*
	88	* void bzero(char * addr, size_t length)
	89	*/
	90	Entry(blkclr)
6d2010ae	91	ENTRY2(bzero,__bzero)
b0d623f7 A	92	movq %rsi,%rcx
	93	xorq %rax,%rax
	94	shrq $3,%rcx
	95	cld
	96	rep
	97	stosq
	98	movq %rsi,%rcx
	99	andq $7,%rcx
	100	rep
	101	stosb
	102	ret