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      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
     35 extern "C" {
     36 #endif
     37 
     38 #if !defined(__lint) && defined(__GNUC__)
     39 
     40 struct _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 
     49 extern __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