bitmap.h revision fdb8cf8c1b80da286f448f5e748b65f9115d7043
/*
* 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 */