/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 * Copyright 2014 Nexenta Systems, Inc.  All rights reserved.
 */

#ifndef _ASM_BITMAP_H
#define _ASM_BITMAP_H

#include <sys/ccompile.h>
#include <sys/types.h>

#ifdef  __cplusplus
extern "C" {
#endif

#if !defined(__lint) && defined(__GNUC__)

#if defined(__amd64)
#define __SUF   "q"
#elif defined(__i386)
#define __SUF   "l"
#else
#error "port me"
#endif

extern __GNU_INLINE int
highbit(ulong_t i)
{
        long value;
        uint8_t zf;

        __asm__(
            "bsr" __SUF " %2,%0;"
            "setz %1"
            : "=r" (value), "=q" (zf)
            : "mr" (i)
            : "cc");

        return (zf ? 0 : (value + 1));
}

extern __GNU_INLINE int
lowbit(ulong_t i)
{
        long value;
        uint8_t zf;

        __asm__(
            "bsf" __SUF " %2,%0;"
            "setz %1"
            : "=r" (value), "=q" (zf)
            : "mr" (i)
            : "cc");

        return (zf ? 0 : (value + 1));
}

extern __GNU_INLINE uint_t
atomic_btr32(uint32_t *memory, uint_t bitnum)
{
        uint8_t value;

        __asm__ __volatile__(
            "lock;"
            "btrl %2,%0;"
            "setc %1"
            : "+m" (*memory), "=r" (value)
            : "ir" (bitnum)
            : "cc");

        return ((uint_t)value);
}

#undef __SUF

#endif  /* !__lint && __GNUC__ */

#ifdef  __cplusplus
}
#endif

#endif  /* _ASM_BITMAP_H */