1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (C) 2003 David Xu <davidxu@freebsd.org> 5 * Copyright (c) 2001 Daniel Eischen <deischen@freebsd.org> 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Neither the name of the author nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 /* 31 * Machine-dependent thread prototypes/definitions. 32 */ 33 #ifndef _PTHREAD_MD_H_ 34 #define _PTHREAD_MD_H_ 35 36 #include <stddef.h> 37 #include <sys/types.h> 38 #include <machine/tls.h> 39 40 #define CPU_SPINWAIT __asm __volatile("pause") 41 42 /* For use in _Static_assert to check structs will fit in a page */ 43 #define THR_PAGE_SIZE_MIN PAGE_SIZE 44 45 static __inline struct pthread * 46 _get_curthread(void) 47 { 48 struct pthread *thr; 49 50 __asm __volatile("movq %%fs:%1, %0" : "=r" (thr) 51 : "m" (*(volatile u_long *)offsetof(struct tcb, tcb_thread))); 52 return (thr); 53 } 54 55 #endif 56