1 /*- 2 * Copyright (c) 2005 David Xu <davidxu@freebsd.org> 3 * Copyright (c) 2015 Ruslan Bukin <br@bsdpad.com> 4 * All rights reserved. 5 * 6 * Portions of this software were developed by SRI International and the 7 * University of Cambridge Computer Laboratory under DARPA/AFRL contract 8 * FA8750-10-C-0237 ("CTSRD"), as part of the DARPA CRASH research programme. 9 * 10 * Portions of this software were developed by the University of Cambridge 11 * Computer Laboratory as part of the CTSRD Project, with support from the 12 * UK Higher Education Innovation Fund (HEIF). 13 * 14 * Redistribution and use in source and binary forms, with or without 15 * modification, are permitted provided that the following conditions 16 * are met: 17 * 1. Redistributions of source code must retain the above copyright 18 * notice, this list of conditions and the following disclaimer. 19 * 2. Redistributions in binary form must reproduce the above copyright 20 * notice, this list of conditions and the following disclaimer in the 21 * documentation and/or other materials provided with the distribution. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * $FreeBSD$ 36 */ 37 38 /* 39 * Machine-dependent thread prototypes/definitions. 40 */ 41 #ifndef _PTHREAD_MD_H_ 42 #define _PTHREAD_MD_H_ 43 44 #include <sys/types.h> 45 #include <stddef.h> 46 47 #define CPU_SPINWAIT 48 #define DTV_OFFSET offsetof(struct tcb, tcb_dtv) 49 #define TP_OFFSET sizeof(struct tcb) 50 51 /* 52 * Variant I tcb. The structure layout is fixed, don't blindly 53 * change it! 54 */ 55 struct tcb { 56 void *tcb_dtv; 57 struct pthread *tcb_thread; 58 }; 59 60 /* Called from the thread to set its private data. */ 61 static __inline void 62 _tcb_set(struct tcb *tcb) 63 { 64 65 __asm __volatile("mv tp, %0" :: "r"((uint8_t *)tcb + TP_OFFSET)); 66 } 67 68 /* 69 * Get the current tcb. 70 */ 71 static __inline struct tcb * 72 _tcb_get(void) 73 { 74 register uint8_t *_tp; 75 76 __asm __volatile("mv %0, tp" : "=r"(_tp)); 77 78 return ((struct tcb *)(_tp - TP_OFFSET)); 79 } 80 81 extern struct pthread *_thr_initial; 82 83 static __inline struct pthread * 84 _get_curthread(void) 85 { 86 87 if (_thr_initial) 88 return (_tcb_get()->tcb_thread); 89 return (NULL); 90 } 91 92 #endif /* _PTHREAD_MD_H_ */ 93