1 /* $OpenBSD: mplock.h,v 1.7 2024/09/04 07:54:51 mglocker 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 * __ppc_lock exists because pte_spill_r() can't use __mp_lock. 34 * Really simple spinlock implementation with recursive capabilities. 35 * Correctness is paramount, no fanciness allowed. 36 */ 37 38 struct __ppc_lock { 39 struct cpu_info *volatile mpl_cpu; 40 long mpl_count; 41 }; 42 43 #ifndef _LOCORE 44 45 #define PPC_LOCK_INITIALIZER { NULL, 0 } 46 47 void __ppc_lock(struct __ppc_lock *); 48 void __ppc_unlock(struct __ppc_lock *); 49 50 #endif 51 52 #endif /* !_POWERPC_MPLOCK_H */ 53