1 /* $NetBSD: smp.h,v 1.5 2023/12/29 22:58:23 chs 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_SMP_H_ 33 #define _LINUX_SMP_H_ 34 35 #include <sys/cpu.h> 36 #include <sys/systm.h> 37 #include <sys/xcall.h> 38 39 #define smp_processor_id() cpu_number() 40 41 static inline int 42 get_cpu(void) 43 { 44 45 kpreempt_disable(); 46 return cpu_index(curcpu()); 47 } 48 49 static inline void 50 put_cpu(void) 51 { 52 53 kpreempt_enable(); 54 } 55 56 static inline void 57 on_each_cpu_xc(void *a, void *b) 58 { 59 void (**fp)(void *) = a; 60 void *cookie = b; 61 62 (**fp)(cookie); 63 } 64 65 static inline void 66 on_each_cpu(void (*f)(void *), void *cookie, int wait) 67 { 68 uint64_t ticket; 69 70 ticket = xc_broadcast(0, &on_each_cpu_xc, &f, cookie); 71 if (wait) 72 xc_wait(ticket); 73 } 74 75 #endif /* _LINUX_SMP_H_ */ 76