1 /*- 2 * Copyright (c) 2005 David Xu <davidxu@freebsd.org>. 3 * Copyright (c) 2014 the FreeBSD Foundation 4 * All rights reserved. 5 * 6 * Portions of this software were developed by Andrew Turner 7 * under sponsorship from the FreeBSD Foundation 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 * 30 * $FreeBSD$ 31 */ 32 33 /* 34 * Machine-dependent thread prototypes/definitions. 35 */ 36 #ifndef _PTHREAD_MD_H_ 37 #define _PTHREAD_MD_H_ 38 39 #include <sys/types.h> 40 #include <machine/sysarch.h> 41 #include <stddef.h> 42 43 #define CPU_SPINWAIT 44 #define DTV_OFFSET offsetof(struct tcb, tcb_dtv) 45 46 /* 47 * Variant I tcb. The structure layout is fixed, don't blindly 48 * change it. 49 */ 50 struct tcb { 51 void *tcb_dtv; 52 struct pthread *tcb_thread; 53 }; 54 55 /* Called from the thread to set its private data. */ 56 static __inline void 57 _tcb_set(struct tcb *tcb) 58 { 59 60 __asm __volatile("msr tpidr_el0, %x0" :: "r" (tcb)); 61 } 62 63 /* 64 * Get the current tcb. 65 */ 66 static __inline struct tcb * 67 _tcb_get(void) 68 { 69 struct tcb *tcb; 70 71 __asm __volatile("mrs %x0, tpidr_el0" : "=r" (tcb)); 72 return (tcb); 73 } 74 75 extern struct pthread *_thr_initial; 76 77 static __inline struct pthread * 78 _get_curthread(void) 79 { 80 81 return (_tcb_get()->tcb_thread); 82 } 83 84 #endif /* _PTHREAD_MD_H_ */ 85