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Annotation of sys/arch/m68k/m68k/copypage.s, Revision 1.1

1.1     ! nbrk        1: /*     $OpenBSD: copypage.s,v 1.4 2005/09/25 22:27:15 miod Exp $       */
        !             2: /*     $NetBSD: copypage.s,v 1.4 1997/05/30 01:34:49 jtc Exp $ */
        !             3:
        !             4: /*-
        !             5:  * Copyright (c) 1997 The NetBSD Foundation, Inc.
        !             6:  * All rights reserved.
        !             7:  *
        !             8:  * This code is derived from software contributed to The NetBSD Foundation
        !             9:  * by J.T. Conklin <jtc@netbsd.org> and
        !            10:  * by Hiroshi Horitomo <horimoto@cs-aoi.cs.sist.ac.jp>
        !            11:  *
        !            12:  * Redistribution and use in source and binary forms, with or without
        !            13:  * modification, are permitted provided that the following conditions
        !            14:  * are met:
        !            15:  * 1. Redistributions of source code must retain the above copyright
        !            16:  *    notice, this list of conditions and the following disclaimer.
        !            17:  * 2. Redistributions in binary form must reproduce the above copyright
        !            18:  *    notice, this list of conditions and the following disclaimer in the
        !            19:  *    documentation and/or other materials provided with the distribution.
        !            20:  * 3. All advertising materials mentioning features or use of this software
        !            21:  *    must display the following acknowledgement:
        !            22:  *        This product includes software developed by the NetBSD
        !            23:  *        Foundation, Inc. and its contributors.
        !            24:  * 4. Neither the name of The NetBSD Foundation nor the names of its
        !            25:  *    contributors may be used to endorse or promote products derived
        !            26:  *    from this software without specific prior written permission.
        !            27:  *
        !            28:  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
        !            29:  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
        !            30:  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
        !            31:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
        !            32:  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
        !            33:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
        !            34:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
        !            35:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
        !            36:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
        !            37:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
        !            38:  * POSSIBILITY OF SUCH DAMAGE.
        !            39:  */
        !            40:
        !            41: /*
        !            42:  * Optimized functions for copying/clearing a whole page.
        !            43:  */
        !            44:
        !            45: #include <machine/asm.h>
        !            46: #include "assym.h"
        !            47:
        !            48:        .file   "copypage.s"
        !            49:        .text
        !            50:
        !            51: /*
        !            52:  * copypage040(fromaddr, toaddr)
        !            53:  *
        !            54:  * Optimized version of bcopy for a single page-aligned NBPG byte copy,
        !            55:  * using instructions only available on the mc68040 and later.
        !            56:  */
        !            57: #if defined(M68040) || defined(M68060)
        !            58: ENTRY(copypage040)
        !            59:        movl    sp@(4),a0               | source address
        !            60:        movl    sp@(8),a1               | destination address
        !            61:        movw    #NBPG/32-1,d0           | number of 32 byte chunks - 1
        !            62: Lm16loop:
        !            63:        .long   0xf6209000              | move16 a0@+,a1@+
        !            64:        .long   0xf6209000              | move16 a0@+,a1@+
        !            65:        dbf     d0,Lm16loop
        !            66:        rts
        !            67: #endif /* M68040 || M68060 */
        !            68:
        !            69: /*
        !            70:  * copypage(fromaddr, toaddr)
        !            71:  *
        !            72:  * Optimized version of bcopy for a single page-aligned NBPG byte copy.
        !            73:  */
        !            74: ENTRY(copypage)
        !            75:        movl    sp@(4),a0               | source address
        !            76:        movl    sp@(8),a1               | destination address
        !            77:        movw    #NBPG/32-1,d0           | number of 32 byte chunks - 1
        !            78: Lmlloop:
        !            79:        movl    a0@+,a1@+
        !            80:        movl    a0@+,a1@+
        !            81:        movl    a0@+,a1@+
        !            82:        movl    a0@+,a1@+
        !            83:        movl    a0@+,a1@+
        !            84:        movl    a0@+,a1@+
        !            85:        movl    a0@+,a1@+
        !            86:        movl    a0@+,a1@+
        !            87:        dbf     d0,Lmlloop
        !            88:        rts
        !            89:
        !            90: /*
        !            91:  * zeropage(addr)
        !            92:  *
        !            93:  * Optimized version of bzero for a single page-aligned NBPG byte zero.
        !            94:  */
        !            95: ENTRY(zeropage)
        !            96:        movl    sp@(4),a0               | dest address
        !            97:        movql   #NBPG/256-1,d0          | number of 256 byte chunks - 1
        !            98:        movml   d2-d7,sp@-
        !            99:        movql   #0,d1
        !           100:        movql   #0,d2
        !           101:        movql   #0,d3
        !           102:        movql   #0,d4
        !           103:        movql   #0,d5
        !           104:        movql   #0,d6
        !           105:        movql   #0,d7
        !           106:        movl    d1,a1
        !           107:        lea     a0@(NBPG),a0
        !           108: Lzloop:
        !           109:        movml   d1-d7/a1,a0@-
        !           110:        movml   d1-d7/a1,a0@-
        !           111:        movml   d1-d7/a1,a0@-
        !           112:        movml   d1-d7/a1,a0@-
        !           113:        movml   d1-d7/a1,a0@-
        !           114:        movml   d1-d7/a1,a0@-
        !           115:        movml   d1-d7/a1,a0@-
        !           116:        movml   d1-d7/a1,a0@-
        !           117:        dbf     d0,Lzloop
        !           118:        movml   sp@+,d2-d7
        !           119:        rts