1/*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright 2004 by Peter Grehan. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. The name of the author may not be used to endorse or promote products 15 * derived from this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 22 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 24 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 25 * 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 41#define CPU_SPINWAIT 42 43#define DTV_OFFSET offsetof(struct tcb, tcb_dtv) 44#ifdef __powerpc64__ 45#define TP_OFFSET 0x7010 46#else 47#define TP_OFFSET 0x7008 48#endif 49 50/* 51 * Variant I tcb. The structure layout is fixed, don't blindly 52 * change it. 53 * %r2 (32-bit) or %r13 (64-bit) points to end of the structure. 54 */ 55struct tcb { 56 void *tcb_dtv; 57 struct pthread *tcb_thread; 58}; 59 60static __inline void 61_tcb_set(struct tcb *tcb) 62{ 63#ifdef __powerpc64__ 64 __asm __volatile("mr 13,%0" :: 65 "r"((uint8_t *)tcb + TP_OFFSET)); 66#else 67 __asm __volatile("mr 2,%0" :: 68 "r"((uint8_t *)tcb + TP_OFFSET)); 69#endif 70} 71 72static __inline struct tcb * 73_tcb_get(void) 74{ 75 register uint8_t *_tp; 76#ifdef __powerpc64__ 77 __asm __volatile("mr %0,13" : "=r"(_tp)); 78#else 79 __asm __volatile("mr %0,2" : "=r"(_tp)); 80#endif 81 82 return ((struct tcb *)(_tp - TP_OFFSET)); 83} 84 85static __inline struct pthread * 86_get_curthread(void) 87{ 88 if (_thr_initial) 89 return (_tcb_get()->tcb_thread); 90 return (NULL); 91} 92 93#endif /* _PTHREAD_MD_H_ */ 94