1 /* $NetBSD: hardirq.h,v 1.2 2018/08/27 13:37:37 riastradh Exp $ */ 2 3 /*- 4 * Copyright (c) 2018 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Taylor R. Campbell. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #ifndef _LINUX_HARDIRQ_H_ 33 #define _LINUX_HARDIRQ_H_ 34 35 #include <sys/types.h> 36 #include <sys/kernel.h> 37 #include <sys/null.h> 38 #include <sys/xcall.h> 39 40 static inline void 41 synchronize_irq_xc(void *a, void *b) 42 { 43 } 44 45 /* 46 * synchronize(irq) 47 * 48 * Wait for all interrupt handlers servicing irq to complete on 49 * all CPUs. We just do a low-priority cross-call broadcast to 50 * all CPUs, which can't run until interrupt handlers are done 51 * running. 52 */ 53 static inline void 54 synchronize_irq(int irq) 55 { 56 57 if (!cold) 58 xc_wait(xc_broadcast(0, synchronize_irq_xc, NULL, NULL)); 59 } 60 61 #endif /* _LINUX_HARDIRQ_H_ */ 62