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