1 /*-
2  * Copyright (c) 2005 David Xu <davidxu@freebsd.org>.
3  * Copyright (c) 2014 the FreeBSD Foundation
4  * All rights reserved.
5  *
6  * Portions of this software were developed by Andrew Turner
7  * under sponsorship from the FreeBSD Foundation
8  *
9  * Redistribution and use in source and binary forms, with or without
10  * modification, are permitted provided that the following conditions
11  * are met:
12  *
13  * 1. Redistributions of source code must retain the above copyright
14  *    notice, this list of conditions and the following disclaimer.
15  * 2. Redistributions in binary form must reproduce the above copyright
16  *    notice, this list of conditions and the following disclaimer in the
17  *    documentation and/or other materials provided with the distribution.
18  *
19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29  *
30  * $FreeBSD$
31  */
32 
33 /*
34  * Machine-dependent thread prototypes/definitions.
35  */
36 #ifndef _PTHREAD_MD_H_
37 #define	_PTHREAD_MD_H_
38 
39 #include <sys/types.h>
40 #include <machine/sysarch.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  */
50 struct tcb {
51 	void			*tcb_dtv;
52 	struct pthread		*tcb_thread;
53 };
54 
55 /* Called from the thread to set its private data. */
56 static __inline void
57 _tcb_set(struct tcb *tcb)
58 {
59 
60 	__asm __volatile("msr	tpidr_el0, %x0" :: "r" (tcb));
61 }
62 
63 /*
64  * Get the current tcb.
65  */
66 static __inline struct tcb *
67 _tcb_get(void)
68 {
69 	struct tcb *tcb;
70 
71 	__asm __volatile("mrs	%x0, tpidr_el0" : "=r" (tcb));
72 	return (tcb);
73 }
74 
75 extern struct pthread *_thr_initial;
76 
77 static __inline struct pthread *
78 _get_curthread(void)
79 {
80 
81 	return (_tcb_get()->tcb_thread);
82 }
83 
84 #endif /* _PTHREAD_MD_H_ */
85