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
_tcb_set(struct tcb * tcb)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 *
_tcb_get(void)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 *
_get_curthread(void)78 _get_curthread(void)
79 {
80
81 return (_tcb_get()->tcb_thread);
82 }
83
84 #endif /* _PTHREAD_MD_H_ */
85