| 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 | |