1/*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2005 David Xu <davidxu@freebsd.org>. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 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 ``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, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 * 28 * from: src/lib/libthr/arch/arm/include/pthread_md.h,v 1.3 2005/10/29 13:40:31 davidxu 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 <sys/types.h> 39#include <machine/sysarch.h> 40#include <machine/tls.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 */ 50struct tcb { 51 void *tcb_dtv; 52 struct pthread *tcb_thread; 53}; 54 55/* Called from the thread to set its private data. */ 56static __inline void 57_tcb_set(struct tcb *tcb) 58{ 59 60 sysarch(MIPS_SET_TLS, tcb); 61} 62 63/* 64 * Get the current tcb. 65 */ 66#ifdef TLS_USE_SYSARCH 67static __inline struct tcb * 68_tcb_get(void) 69{ 70 struct tcb *tcb; 71 72 sysarch(MIPS_GET_TLS, &tcb); 73 return tcb; 74} 75 76#else /* ! TLS_USE_SYSARCH */ 77 78# if defined(__mips_n64) 79static __inline struct tcb * 80_tcb_get(void) 81{ 82 uint64_t _rv; 83 84 __asm__ __volatile__ ( 85 ".set\tpush\n\t" 86 ".set\tmips64r2\n\t" 87 "rdhwr\t%0, $29\n\t" 88 ".set\tpop" 89 : "=r" (_rv)); 90 91 /* 92 * XXXSS See 'git show c6be4f4d2d1b71c04de5d3bbb6933ce2dbcdb317' 93 * 94 * Remove the offset since this really a request to get the TLS 95 * pointer via sysarch() (in theory). Of course, this may go away 96 * once the TLS code is rewritten. 97 */ 98 return (struct tcb *)(_rv - TLS_TP_OFFSET - TLS_TCB_SIZE); 99} 100# else /* mips 32 */ 101static __inline struct tcb * 102_tcb_get(void) 103{ 104 uint32_t _rv; 105 106 __asm__ __volatile__ ( 107 ".set\tpush\n\t" 108 ".set\tmips32r2\n\t" 109 "rdhwr\t%0, $29\n\t" 110 ".set\tpop" 111 : "=r" (_rv)); 112 113 /* 114 * XXXSS See 'git show c6be4f4d2d1b71c04de5d3bbb6933ce2dbcdb317' 115 * 116 * Remove the offset since this really a request to get the TLS 117 * pointer via sysarch() (in theory). Of course, this may go away 118 * once the TLS code is rewritten. 119 */ 120 return (struct tcb *)(_rv - TLS_TP_OFFSET - TLS_TCB_SIZE); 121} 122# endif /* ! __mips_n64 */ 123#endif /* ! TLS_USE_SYSARCH */ 124 125static __inline struct pthread * 126_get_curthread(void) 127{ 128 if (_thr_initial) 129 return (_tcb_get()->tcb_thread); 130 return (NULL); 131} 132 133#endif /* _PTHREAD_MD_H_ */ 134