1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2002 Daniel Eischen <deischen@freebsd.org>. 5 * Copyright (c) 2005 David Xu <davidxu@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. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 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 * $FreeBSD$ 30 */ 31 32 /* 33 * Machine-dependent thread prototypes/definitions. 34 */ 35 #ifndef _PTHREAD_MD_H_ 36 #define _PTHREAD_MD_H_ 37 38 #include <stddef.h> 39 #include <sys/types.h> 40 #include <machine/tls.h> 41 42 #define CPU_SPINWAIT __asm __volatile("pause") 43 44 /* For use in _Static_assert to check structs will fit in a page */ 45 #define THR_PAGE_SIZE_MIN PAGE_SIZE 46 47 static __inline struct pthread * 48 _get_curthread(void) 49 { 50 struct pthread *thr; 51 52 __asm __volatile("movl %%gs:%1, %0" : "=r" (thr) 53 : "m" (*(volatile u_int *)offsetof(struct tcb, tcb_thread))); 54 return (thr); 55 } 56 57 #define HAS__UMTX_OP_ERR 1 58 59 #endif 60