1 #ifndef _M88K_MUTEX_H_ 2 #define _M88K_MUTEX_H_ 3 /* $OpenBSD: mutex.h,v 1.2 2014/02/02 20:31:10 kettenis Exp $ */ 4 5 /* 6 * Copyright (c) 2005, Miodrag Vallat. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 20 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 21 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 25 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 26 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 27 * POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30 struct mutex { 31 volatile int mtx_lock; /* mutex.S relies upon this field being first */ 32 int mtx_wantipl; 33 int mtx_oldipl; 34 void *mtx_cpu; 35 }; 36 37 /* 38 * To prevent lock ordering problems with the kernel lock, we need to 39 * make sure we block all interrupts that can grab the kernel lock. 40 * The simplest way to achieve this is to make sure mutexes always 41 * raise the interrupt priority level to the highest level that has 42 * interrupts that grab the kernel lock. 43 */ 44 #ifdef MULTIPROCESSOR 45 #define __MUTEX_IPL(ipl) \ 46 (((ipl) > IPL_NONE && (ipl) < IPL_TTY) ? IPL_TTY : (ipl)) 47 #else 48 #define __MUTEX_IPL(ipl) (ipl) 49 #endif 50 51 #define MUTEX_INITIALIZER(ipl) { 0, __MUTEX_IPL((ipl)), IPL_NONE, NULL } 52 53 void __mtx_init(struct mutex *, int); 54 #define mtx_init(mtx, ipl) __mtx_init((mtx), __MUTEX_IPL((ipl))) 55 56 #ifdef DIAGNOSTIC 57 58 #define MUTEX_ASSERT_LOCKED(mtx) \ 59 do { \ 60 if ((mtx)->mtx_lock == 0 || (mtx)->mtx_cpu != curcpu()) \ 61 panic("mutex %p not held in %s", (mtx), __func__); \ 62 } while (0) 63 64 #define MUTEX_ASSERT_UNLOCKED(mtx) \ 65 do { \ 66 if ((mtx)->mtx_lock != 0) \ 67 panic("mutex %p held in %s", (mtx), __func__); \ 68 } while (0) 69 70 #else 71 72 #define MUTEX_ASSERT_LOCKED(mtx) do { /* nothing */ } while (0) 73 #define MUTEX_ASSERT_UNLOCKED(mtx) do { /* nothing */ } while (0) 74 75 #endif 76 77 #define MUTEX_OLDIPL(mtx) (mtx)->mtx_oldipl 78 79 #endif /* _M88K_MUTEX_H_ */ 80