1 /* $OpenBSD: mplock.h,v 1.4 2020/04/15 08:09:00 mpi Exp $ */ 2 3 /* 4 * Copyright (c) 2004 Niklas Hallqvist. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #ifndef _POWERPC_MPLOCK_H_ 28 #define _POWERPC_MPLOCK_H_ 29 30 #define __USE_MI_MPLOCK 31 32 /* 33 * Really simple spinlock implementation with recursive capabilities. 34 * Correctness is paramount, no fancyness allowed. 35 */ 36 37 struct __ppc_lock { 38 volatile struct cpu_info *mpl_cpu; 39 volatile long mpl_count; 40 }; 41 42 #ifndef _LOCORE 43 44 void __ppc_lock_init(struct __ppc_lock *); 45 void __ppc_lock(struct __ppc_lock *); 46 void __ppc_unlock(struct __ppc_lock *); 47 int __ppc_release_all(struct __ppc_lock *); 48 int __ppc_release_all_but_one(struct __ppc_lock *); 49 void __ppc_acquire_count(struct __ppc_lock *, int); 50 int __ppc_lock_held(struct __ppc_lock *, struct cpu_info *); 51 52 #endif 53 54 #endif /* !_POWERPC_MPLOCK_H */ 55