Home | History | Annotate | Line # | Download | only in linux 
      1 /*	$NetBSD: hardirq.h,v 1.3 2021/12/19 11:38:37 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/xcall.h>
     38 
     39 /*
     40  * synchronize_irq(irq)
     41  *
     42  *	Wait for all interrupt handlers servicing irq to complete on
     43  *	all CPUs.  We just do a low-priority cross-call broadcast to
     44  *	all CPUs, which can't run until interrupt handlers are done
     45  *	running.
     46  */
     47 static inline void
     48 synchronize_irq(int irq)
     49 {
     50 
     51 	if (!cold)
     52 		xc_barrier(0);
     53 }
     54 
     55 static inline void
     56 synchronize_hardirq(int irq)
     57 {
     58 
     59 	if (!cold)
     60 		xc_barrier(XC_HIGHPRI);
     61 }
     62 
     63 #endif	/* _LINUX_HARDIRQ_H_ */
     64