1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright 2004 by Peter Grehan. All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 * 3. The name of the author may not be used to endorse or promote products
15 *    derived from this software without specific prior written permission.
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,
22 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
24 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
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 <stddef.h>
39#include <sys/types.h>
40
41#define	CPU_SPINWAIT
42
43#define	DTV_OFFSET		offsetof(struct tcb, tcb_dtv)
44#ifdef __powerpc64__
45#define	TP_OFFSET		0x7010
46#else
47#define	TP_OFFSET		0x7008
48#endif
49
50/*
51 * Variant I tcb. The structure layout is fixed, don't blindly
52 * change it.
53 * %r2 (32-bit) or %r13 (64-bit) points to end of the structure.
54 */
55struct tcb {
56	void			*tcb_dtv;
57	struct pthread		*tcb_thread;
58};
59
60static __inline void
61_tcb_set(struct tcb *tcb)
62{
63#ifdef __powerpc64__
64	__asm __volatile("mr 13,%0" ::
65	    "r"((uint8_t *)tcb + TP_OFFSET));
66#else
67	__asm __volatile("mr 2,%0" ::
68	    "r"((uint8_t *)tcb + TP_OFFSET));
69#endif
70}
71
72static __inline struct tcb *
73_tcb_get(void)
74{
75	register uint8_t *_tp;
76#ifdef __powerpc64__
77	__asm __volatile("mr %0,13" : "=r"(_tp));
78#else
79	__asm __volatile("mr %0,2" : "=r"(_tp));
80#endif
81
82	return ((struct tcb *)(_tp - TP_OFFSET));
83}
84
85static __inline struct pthread *
86_get_curthread(void)
87{
88	if (_thr_initial)
89		return (_tcb_get()->tcb_thread);
90	return (NULL);
91}
92
93#endif /* _PTHREAD_MD_H_ */
94