lock.h revision 1.1.2.2
1 1.1.2.2 jdolecek /* $NetBSD: lock.h,v 1.1.2.2 2002/06/23 17:37:09 jdolecek Exp $ */ 2 1.1.2.2 jdolecek 3 1.1.2.2 jdolecek /*- 4 1.1.2.2 jdolecek * Copyright (c) 1998, 1999, 2000, 2001 The NetBSD Foundation, Inc. 5 1.1.2.2 jdolecek * All rights reserved. 6 1.1.2.2 jdolecek * 7 1.1.2.2 jdolecek * This code is derived from software contributed to The NetBSD Foundation 8 1.1.2.2 jdolecek * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility, 9 1.1.2.2 jdolecek * NASA Ames Research Center, and Matthew Fredette. 10 1.1.2.2 jdolecek * 11 1.1.2.2 jdolecek * Redistribution and use in source and binary forms, with or without 12 1.1.2.2 jdolecek * modification, are permitted provided that the following conditions 13 1.1.2.2 jdolecek * are met: 14 1.1.2.2 jdolecek * 1. Redistributions of source code must retain the above copyright 15 1.1.2.2 jdolecek * notice, this list of conditions and the following disclaimer. 16 1.1.2.2 jdolecek * 2. Redistributions in binary form must reproduce the above copyright 17 1.1.2.2 jdolecek * notice, this list of conditions and the following disclaimer in the 18 1.1.2.2 jdolecek * documentation and/or other materials provided with the distribution. 19 1.1.2.2 jdolecek * 3. All advertising materials mentioning features or use of this software 20 1.1.2.2 jdolecek * must display the following acknowledgement: 21 1.1.2.2 jdolecek * This product includes software developed by the NetBSD 22 1.1.2.2 jdolecek * Foundation, Inc. and its contributors. 23 1.1.2.2 jdolecek * 4. Neither the name of The NetBSD Foundation nor the names of its 24 1.1.2.2 jdolecek * contributors may be used to endorse or promote products derived 25 1.1.2.2 jdolecek * from this software without specific prior written permission. 26 1.1.2.2 jdolecek * 27 1.1.2.2 jdolecek * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 28 1.1.2.2 jdolecek * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 29 1.1.2.2 jdolecek * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 30 1.1.2.2 jdolecek * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 31 1.1.2.2 jdolecek * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 32 1.1.2.2 jdolecek * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 33 1.1.2.2 jdolecek * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 34 1.1.2.2 jdolecek * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 35 1.1.2.2 jdolecek * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 36 1.1.2.2 jdolecek * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 37 1.1.2.2 jdolecek * POSSIBILITY OF SUCH DAMAGE. 38 1.1.2.2 jdolecek */ 39 1.1.2.2 jdolecek 40 1.1.2.2 jdolecek /* 41 1.1.2.2 jdolecek * Machine-dependent spin lock operations. 42 1.1.2.2 jdolecek */ 43 1.1.2.2 jdolecek 44 1.1.2.2 jdolecek #ifndef _HPPA_LOCK_H_ 45 1.1.2.2 jdolecek #define _HPPA_LOCK_H_ 46 1.1.2.2 jdolecek 47 1.1.2.2 jdolecek #ifdef MULTIPROCESSOR 48 1.1.2.2 jdolecek 49 1.1.2.2 jdolecek /* 50 1.1.2.2 jdolecek * Semaphores must be aligned on 16-byte boundaries on the PA-RISC. 51 1.1.2.2 jdolecek */ 52 1.1.2.2 jdolecek typedef __volatile struct { 53 1.1.2.2 jdolecek int32_t sem __attribute__ ((aligned (16))); 54 1.1.2.2 jdolecek } __cpu_simple_lock_t; 55 1.1.2.2 jdolecek 56 1.1.2.2 jdolecek 57 1.1.2.2 jdolecek static __inline void 58 1.1.2.2 jdolecek __cpu_simple_lock_init(__cpu_simple_lock_t *alp) 59 1.1.2.2 jdolecek { 60 1.1.2.2 jdolecek __asm __volatile( 61 1.1.2.2 jdolecek " ; BEGIN __cpu_simple_lock_init\n" 62 1.1.2.2 jdolecek " stw %1, %0 \n" 63 1.1.2.2 jdolecek " sync \n" 64 1.1.2.2 jdolecek " ; END __cpu_simple_lock_init" 65 1.1.2.2 jdolecek : "=m" (*alp->sem) 66 1.1.2.2 jdolecek : "r" (__SIMPLELOCK_UNLOCKED)); 67 1.1.2.2 jdolecek } 68 1.1.2.2 jdolecek 69 1.1.2.2 jdolecek static __inline void 70 1.1.2.2 jdolecek __cpu_simple_lock(__cpu_simple_lock_t *alp) 71 1.1.2.2 jdolecek { 72 1.1.2.2 jdolecek int32_t t0; 73 1.1.2.2 jdolecek 74 1.1.2.2 jdolecek /* 75 1.1.2.2 jdolecek * Note, if we detect that the lock is held when 76 1.1.2.2 jdolecek * we do the initial load-clear-word, we spin using 77 1.1.2.2 jdolecek * a non-locked load to save the coherency logic 78 1.1.2.2 jdolecek * some work. 79 1.1.2.2 jdolecek */ 80 1.1.2.2 jdolecek 81 1.1.2.2 jdolecek __asm __volatile( 82 1.1.2.2 jdolecek " ; BEGIN __cpu_simple_lock\n" 83 1.1.2.2 jdolecek " ldcw %1, %0 \n" 84 1.1.2.2 jdolecek " comb,<>,n %%r0,%0, 2f \n" 85 1.1.2.2 jdolecek "1: comb,=,n %%r0,%0, 1b \n" 86 1.1.2.2 jdolecek " ldw %1, %0 \n" 87 1.1.2.2 jdolecek " ldcw %1, %0 \n" 88 1.1.2.2 jdolecek " comb,=,n %%r0,%0, 1b \n" 89 1.1.2.2 jdolecek " ldw %1, %0 \n" 90 1.1.2.2 jdolecek "2: sync \n" 91 1.1.2.2 jdolecek " ; END __cpu_simple_lock\n" 92 1.1.2.2 jdolecek : "=r" (t0), "+m" (*alp->sem)); 93 1.1.2.2 jdolecek } 94 1.1.2.2 jdolecek 95 1.1.2.2 jdolecek static __inline int 96 1.1.2.2 jdolecek __cpu_simple_lock_try(__cpu_simple_lock_t *alp) 97 1.1.2.2 jdolecek { 98 1.1.2.2 jdolecek int32_t t0; 99 1.1.2.2 jdolecek 100 1.1.2.2 jdolecek __asm __volatile( 101 1.1.2.2 jdolecek " ; BEGIN __cpu_simple_lock_try\n" 102 1.1.2.2 jdolecek " ldcw %1, %0 \n" 103 1.1.2.2 jdolecek " sync \n" 104 1.1.2.2 jdolecek " ; END __cpu_simple_lock_try" 105 1.1.2.2 jdolecek : "=r" (t0), "+m" (*alp->sem)); 106 1.1.2.2 jdolecek return (t0 != 0); 107 1.1.2.2 jdolecek } 108 1.1.2.2 jdolecek 109 1.1.2.2 jdolecek static __inline void 110 1.1.2.2 jdolecek __cpu_simple_unlock(__cpu_simple_lock_t *alp) 111 1.1.2.2 jdolecek { 112 1.1.2.2 jdolecek __asm __volatile( 113 1.1.2.2 jdolecek " ; BEGIN __cpu_simple_unlock\n" 114 1.1.2.2 jdolecek " sync \n" 115 1.1.2.2 jdolecek " stw %1, %0 \n" 116 1.1.2.2 jdolecek " ; END __cpu_simple_unlock" 117 1.1.2.2 jdolecek : "+m" (*alp->sem) 118 1.1.2.2 jdolecek : "r" (__SIMPLELOCK_UNLOCKED)); 119 1.1.2.2 jdolecek } 120 1.1.2.2 jdolecek 121 1.1.2.2 jdolecek #else /* !MULTIPROCESSOR */ 122 1.1.2.2 jdolecek 123 1.1.2.2 jdolecek typedef __volatile int __cpu_simple_lock_t; 124 1.1.2.2 jdolecek 125 1.1.2.2 jdolecek #define __SIMPLELOCK_LOCKED 1 126 1.1.2.2 jdolecek #define __SIMPLELOCK_UNLOCKED 0 127 1.1.2.2 jdolecek 128 1.1.2.2 jdolecek #endif /* !MULTIPROCESSOR */ 129 1.1.2.2 jdolecek 130 1.1.2.2 jdolecek #endif /* _HPPA_LOCK_H_ */ 131
Indexes created Mon Oct 20 20:10:13 GMT 2025