xref: /freebsd/lib/libthr/arch/powerpc/include/pthread_md.h (revision 39beb93c3f8bdbf72a61fda42300b5ebed7390c8)
1 /*
2  * Copyright 2004 by Peter Grehan. All rights reserved.
3  *
4  * Redistribution and use in source and binary forms, with or without
5  * modification, are permitted provided that the following conditions
6  * are met:
7  * 1. Redistributions of source code must retain the above copyright
8  *    notice, this list of conditions and the following disclaimer.
9  * 2. Redistributions in binary form must reproduce the above copyright
10  *    notice, this list of conditions and the following disclaimer in the
11  *    documentation and/or other materials provided with the distribution.
12  * 3. The name of the author may not be used to endorse or promote products
13  *    derived from this software without specific prior written permission.
14  *
15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
20  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
21  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
22  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
23  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25  * SUCH DAMAGE.
26  *
27  * $FreeBSD$
28  */
29 
30 /*
31  * Machine-dependent thread prototypes/definitions.
32  */
33 #ifndef _PTHREAD_MD_H_
34 #define	_PTHREAD_MD_H_
35 
36 #include <stddef.h>
37 #include <sys/types.h>
38 
39 #define	CPU_SPINWAIT
40 
41 #define	DTV_OFFSET		offsetof(struct tcb, tcb_dtv)
42 #define	TP_OFFSET		0x7008
43 
44 /*
45  * Variant I tcb. The structure layout is fixed, don't blindly
46  * change it.
47  * %r2 points to end of the structure.
48  */
49 struct tcb {
50 	void			*tcb_dtv;
51 	struct pthread		*tcb_thread;
52 };
53 
54 struct tcb	*_tcb_ctor(struct pthread *, int);
55 void		_tcb_dtor(struct tcb *);
56 
57 static __inline void
58 _tcb_set(struct tcb *tcb)
59 {
60 	register uint8_t *_tp __asm__("%r2");
61 
62 	__asm __volatile("mr %0,%1" : "=r"(_tp) :
63 	    "r"((uint8_t *)tcb + TP_OFFSET));
64 }
65 
66 static __inline struct tcb *
67 _tcb_get(void)
68 {
69 	register uint8_t *_tp __asm__("%r2");
70 
71 	return ((struct tcb *)(_tp - TP_OFFSET));
72 }
73 
74 extern struct pthread *_thr_initial;
75 
76 static __inline struct pthread *
77 _get_curthread(void)
78 {
79 	if (_thr_initial)
80 		return (_tcb_get()->tcb_thread);
81 	return (NULL);
82 }
83 
84 #endif /* _PTHREAD_MD_H_ */
85