1 /* $NetBSD: ipi.h,v 1.3 2015/01/18 23:16:35 rmind Exp $ */ 2 3 /*- 4 * Copyright (c) 2014 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Mindaugas Rasiukevicius. 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 _SYS_IPI_H_ 33 #define _SYS_IPI_H_ 34 35 #if !defined(_KERNEL) && !defined(_KMEMUSER) 36 #error "not supposed to be exposed to userland" 37 #endif 38 39 typedef void (*ipi_func_t)(void *); 40 41 typedef struct { 42 /* Public: function handler and an argument. */ 43 ipi_func_t func; 44 void * arg; 45 46 /* Private (internal) elements. */ 47 volatile u_int _pending; 48 } ipi_msg_t; 49 50 /* 51 * Internal constants and implementation hooks. 52 * 53 * IPI_MAXREG: the maximum number of asynchronous handlers which can 54 * be registered on the system (normally, this should not be high). 55 */ 56 #define IPI_MAXREG 32 57 58 #define IPI_BITW_SHIFT 5 59 #define IPI_BITW_MASK (32 - 1) 60 #define IPI_BITWORDS (IPI_MAXREG >> IPI_BITW_SHIFT) 61 62 void ipi_sysinit(void); 63 void ipi_cpu_handler(void); 64 void cpu_ipi(struct cpu_info *); 65 66 /* Public interface: asynchronous IPIs. */ 67 u_int ipi_register(ipi_func_t, void *); 68 void ipi_unregister(u_int); 69 void ipi_trigger(u_int, struct cpu_info *); 70 void ipi_trigger_multi(u_int, const kcpuset_t *); 71 72 /* Public interface: synchronous IPIs. */ 73 void ipi_unicast(ipi_msg_t *, struct cpu_info *); 74 void ipi_multicast(ipi_msg_t *, const kcpuset_t *); 75 void ipi_broadcast(ipi_msg_t *); 76 void ipi_wait(ipi_msg_t *); 77 78 #endif 79