2 * Copyright (c) 1997 Berkeley Software Design, Inc. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * 3. Berkeley Software Design Inc's name may not be used to endorse or
13 * promote products derived from this software without specific prior
16 * THIS SOFTWARE IS PROVIDED BY BERKELEY SOFTWARE DESIGN INC ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL BERKELEY SOFTWARE DESIGN INC BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * from BSDI $Id: mutex.h,v 2.7.2.35 2000/04/27 03:10:26 cp Exp $
32 #ifndef _MACHINE_MUTEX_H_
33 #define _MACHINE_MUTEX_H_
38 * Simple assembly macros to get and release non-recursive spin locks
40 #define MTX_ENTER(lck, rPSR, rOLD, rNEW, rLCK) \
43 addl rLCK=@ltoff(lck),gp ;; \
45 add rLCK=MTX_LOCK,rLCK ;; \
47 mov ar.ccv=MTX_UNOWNED ; \
48 add rNEW=PC_CURTHREAD,rNEW ;; \
50 1: cmpxchg8.acq rOLD=[rLCK],rNEW,ar.ccv ;; \
51 cmp.eq p1,p0=MTX_UNOWNED,rOLD ;; \
52 (p1) br.cond.spnt.few 1b ;; \
53 addl rLCK=@ltoff(lck),gp ;; \
55 add rLCK=MTX_SAVEINTR,rLCK ;; \
58 #define MTX_EXIT(lck, rTMP, rLCK) \
59 mov rTMP=MTX_UNOWNED ; \
60 addl rLCK=@ltoff(lck),gp;; \
62 add rLCK=MTX_LOCK,rLCK;; \
63 st8.rel [rLCK]=rTMP,MTX_SAVEINTR-MTX_LOCK ;; \
70 #endif /* __MACHINE_MUTEX_H */