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Annotation of sys/lib/libkern/arch/amd64/scanc.S, Revision 1.1

1.1     ! nbrk        1: /*     $NetBSD: scanc.S,v 1.1 2001/06/19 00:22:47 fvdl Exp $   */
        !             2:
        !             3: /*-
        !             4:  * Copyright (c) 1998 The NetBSD Foundation, Inc.
        !             5:  * All rights reserved.
        !             6:  *
        !             7:  * This code is derived from software contributed to The NetBSD Foundation
        !             8:  * by Charles M. Hannum.
        !             9:  *
        !            10:  * Redistribution and use in source and binary forms, with or without
        !            11:  * modification, are permitted provided that the following conditions
        !            12:  * are met:
        !            13:  * 1. Redistributions of source code must retain the above copyright
        !            14:  *    notice, this list of conditions and the following disclaimer.
        !            15:  * 2. Redistributions in binary form must reproduce the above copyright
        !            16:  *    notice, this list of conditions and the following disclaimer in the
        !            17:  *    documentation and/or other materials provided with the distribution.
        !            18:  * 3. All advertising materials mentioning features or use of this software
        !            19:  *    must display the following acknowledgement:
        !            20:  *        This product includes software developed by the NetBSD
        !            21:  *        Foundation, Inc. and its contributors.
        !            22:  * 4. Neither the name of The NetBSD Foundation nor the names of its
        !            23:  *    contributors may be used to endorse or promote products derived
        !            24:  *    from this software without specific prior written permission.
        !            25:  *
        !            26:  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
        !            27:  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
        !            28:  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
        !            29:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
        !            30:  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
        !            31:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
        !            32:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
        !            33:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
        !            34:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
        !            35:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
        !            36:  * POSSIBILITY OF SUCH DAMAGE.
        !            37:  */
        !            38:
        !            39: /*
        !            40:  * Adapted for NetBSD/x86_64 by Frank van der Linden <fvdl@wasabisystems.com>
        !            41:  */
        !            42:
        !            43: #include <machine/asm.h>
        !            44:
        !            45: ENTRY(scanc)
        !            46:        movq    %rdx,%r11
        !            47:        movb    %cl,%dl
        !            48:        movl    %edi,%ecx
        !            49:        testl   %ecx,%ecx
        !            50:        jz      2f
        !            51:        movq    %r11,%rdi
        !            52:        xorq    %rax,%rax
        !            53:        cld
        !            54: 1:
        !            55:        lodsb
        !            56:        testb   %dl,(%rax,%rdi)
        !            57:        jnz     2f
        !            58:        decl    %ecx
        !            59:        jnz     1b
        !            60: 2:
        !            61:        movl    %ecx,%eax
        !            62:        ret