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 * $FreeBSD$
29 */
30
31/*
32 * Machine-dependent thread prototypes/definitions.
33 */
34#ifndef _PTHREAD_MD_H_
35#define	_PTHREAD_MD_H_
36
37#include <sys/types.h>
38#include <machine/sysarch.h>
39#include <stddef.h>
40
41#define	CPU_SPINWAIT
42#define	DTV_OFFSET		offsetof(struct tcb, tcb_dtv)
43
44/*
45 * Variant I tcb. The structure layout is fixed, don't blindly
46 * change it.
47 */
48struct tcb {
49	void			*tcb_dtv;	/* required by rtld */
50	struct pthread		*tcb_thread;	/* our hook */
51};
52
53/* Called from the thread to set its private data. */
54static __inline void
55_tcb_set(struct tcb *tcb)
56{
57#ifdef ARM_TP_ADDRESS
58	*((struct tcb **)ARM_TP_ADDRESS) = tcb;	/* avoids a system call */
59#else
60	sysarch(ARM_SET_TP, tcb);
61#endif
62}
63
64/*
65 * Get the current tcb.
66 */
67static __inline struct tcb *
68_tcb_get(void)
69{
70#ifdef ARM_TP_ADDRESS
71	return (*((struct tcb **)ARM_TP_ADDRESS));
72#else
73	struct tcb *tcb;
74
75	__asm __volatile("mrc  p15, 0, %0, c13, c0, 3"		\
76	   		 : "=r" (tcb));
77	return (tcb);
78#endif
79}
80
81static __inline struct pthread *
82_get_curthread(void)
83{
84	if (_thr_initial)
85		return (_tcb_get()->tcb_thread);
86	return (NULL);
87}
88
89#endif /* _PTHREAD_MD_H_ */
90