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      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