/*
* Copyright (c) 2000-2013 Apple 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@
*/
/*
* Copyright (C) 1998 Apple Computer
* All Rights Reserved
*/
/*
* @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.
*/
/*
* Bit-mask manipulation routines
*/
#ifndef _I386_BIT_ROUTINES_H_
#define _I386_BIT_ROUTINES_H_
#ifdef MACH_KERNEL_PRIVATE
/*
* General bit-lock routines.
*/
#define bit_lock(bit,l) \
__asm__ volatile(" jmp 1f \n \
0: btl %0, %1 \n \
jb 0b \n \
1: lock \n \
btsl %0,%1 \n \
jb 0b" : \
: \
"r" (bit), "m" (*(volatile int *)(l)) : \
"memory");
#define bit_unlock(bit,l) \
__asm__ volatile(" lock \n \
btrl %0,%1" : \
: \
"r" (bit), "m" (*(volatile int *)(l)));
/*
* Set or clear individual bits in a long word.
* The locked access is needed only to lock access
* to the word, not to individual bits.
*/
#define i_bit_set(bit,l) \
__asm__ volatile(" lock \n \
btsl %0,%1" : \
: \
"r" (bit), "m" (*(volatile int *)(l)));
#define i_bit_clear(bit,l) \
__asm__ volatile(" lock \n \
btrl %0,%1" : \
: \
"r" (bit), "m" (*(volatile int *)(l)));
static inline void atomic_incl(volatile long * p, long delta)
{
__asm__ volatile (" lock \n \
add %0,%1" : \
: \
"r" (delta), "m" (*(volatile long *)p));
}
static inline void atomic_decl(volatile long * p, long delta)
{
__asm__ volatile (" lock \n \
sub %0,%1" : \
: \
"r" (delta), "m" (*(volatile long *)p));
}
static inline int atomic_decl_and_test(volatile long * p, long delta)
{
uint8_t ret;
__asm__ volatile (
" lock \n\t"
" sub %1,%2 \n\t"
" sete %0"
: "=qm" (ret)
: "r" (delta), "m" (*(volatile long *)p));
return ret;
}
#endif /* MACH_KERNEL_PRIVATE */
#endif /* _I386_BIT_ROUTINES_H_ */