1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License").  You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22/*
23 * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
24 * Use is subject to license terms.
25 */
26
27#ifndef _ASM_THREAD_H
28#define	_ASM_THREAD_H
29
30#pragma ident	"%Z%%M%	%I%	%E% SMI"
31
32#include <sys/types.h>
33
34#ifdef	__cplusplus
35extern "C" {
36#endif
37
38#if !defined(__lint) && defined(__GNUC__)
39
40struct _kthread;
41
42/*
43 * 0x10 is offsetof(struct cpu, cpu_thread)
44 * 0x18 is the same thing for the _LP64 version.
45 * (It's also the value of CPU_THREAD in assym.h)
46 * Yuck.
47 */
48
49extern __inline__ struct _kthread *threadp(void)
50{
51	void *__value;
52
53#if defined(__amd64)
54	__asm__ __volatile__(
55	    "movq %%gs:0x18,%0"		/* CPU_THREAD */
56	    : "=r" (__value));
57#elif defined(__i386)
58	__asm__ __volatile__(
59	    "movl %%gs:0x10,%0"		/* CPU_THREAD */
60	    : "=r" (__value));
61#else
62#error	"port me"
63#endif
64	return (__value);
65}
66
67#endif	/* !__lint && __GNUC__ */
68
69#ifdef	__cplusplus
70}
71#endif
72
73#endif	/* _ASM_THREAD_H */
74