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1 /*-
2  * Copyright (c) 1997 Berkeley Software Design, Inc. All rights reserved.
3  *
4  * Redistribution and use in source and binary forms, with or without
5  * modification, are permitted provided that the following conditions
6  * are met:
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
14  *    written permission.
15  *
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
26  * SUCH DAMAGE.
27  *
28  *      from BSDI $Id: mutex.h,v 2.7.2.35 2000/04/27 03:10:26 cp Exp $
29  * $FreeBSD$
30  */
31
32 #ifndef _MACHINE_MUTEX_H_
33 #define _MACHINE_MUTEX_H_
34
35 #ifdef LOCORE
36
37 /*
38  * Simple assembly macros to get and release non-recursive spin locks
39  */
40 #define MTX_ENTER(lck, rPSR, rOLD, rNEW, rLCK)          \
41         mov     rPSR=psr ;                              \
42         mov     rNEW=pcpup ;                            \
43         addl    rLCK=@ltoff(lck),gp ;;                  \
44         ld8     rLCK=[rLCK] ;;                          \
45         add     rLCK=MTX_LOCK,rLCK ;;                   \
46         rsm     psr.i ;                                 \
47         mov     ar.ccv=MTX_UNOWNED ;                    \
48         add     rNEW=PC_CURTHREAD,rNEW ;;               \
49         ld8     rNEW=[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 ;;                  \
54         ld8     rLCK=[rLCK] ;;                          \
55         add     rLCK=MTX_SAVEINTR,rLCK ;;               \
56         st4     [rLCK]=rPSR
57
58 #define MTX_EXIT(lck, rTMP, rLCK)                       \
59         mov     rTMP=MTX_UNOWNED ;                      \
60         addl    rLCK=@ltoff(lck),gp;;                   \
61         ld8     rLCK=[rLCK];;                           \
62         add     rLCK=MTX_LOCK,rLCK;;                    \
63         st8.rel [rLCK]=rTMP,MTX_SAVEINTR-MTX_LOCK ;;    \
64         ld4     rTMP=[rLCK] ;;                          \
65         mov     psr.l=rTMP ;;                           \
66         srlz.d
67
68 #endif  /* !LOCORE */
69
70 #endif  /* __MACHINE_MUTEX_H */