1 /* 2 * Copyright 2004 by Peter Grehan. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 3. The name of the author may not be used to endorse or promote products 13 * derived from this software without specific prior written permission. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 20 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 21 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 22 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 23 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 * 27 * $FreeBSD$ 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 39 #define CPU_SPINWAIT 40 41 #define DTV_OFFSET offsetof(struct tcb, tcb_dtv) 42 #define TP_OFFSET 0x7008 43 44 /* 45 * Variant I tcb. The structure layout is fixed, don't blindly 46 * change it. 47 * %r2 points to end of the structure. 48 */ 49 struct tcb { 50 void *tcb_dtv; 51 struct pthread *tcb_thread; 52 }; 53 54 struct tcb *_tcb_ctor(struct pthread *, int); 55 void _tcb_dtor(struct tcb *); 56 57 static __inline void 58 _tcb_set(struct tcb *tcb) 59 { 60 register uint8_t *_tp __asm__("%r2"); 61 62 __asm __volatile("mr %0,%1" : "=r"(_tp) : 63 "r"((uint8_t *)tcb + TP_OFFSET)); 64 } 65 66 static __inline struct tcb * 67 _tcb_get(void) 68 { 69 register uint8_t *_tp __asm__("%r2"); 70 71 return ((struct tcb *)(_tp - TP_OFFSET)); 72 } 73 74 extern struct pthread *_thr_initial; 75 76 static __inline struct pthread * 77 _get_curthread(void) 78 { 79 if (_thr_initial) 80 return (_tcb_get()->tcb_thread); 81 return (NULL); 82 } 83 84 #endif /* _PTHREAD_MD_H_ */ 85