usr/src/uts/intel/asm/cpuvar.h

   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_CPUVAR_H
  28 #define _ASM_CPUVAR_H
  29
  30 #include <sys/ccompile.h>
  31 #include <sys/types.h>
  32
  33 #ifdef  __cplusplus
  34 extern "C" {
  35 #endif
  36
  37 #if !defined(__lint) && defined(__GNUC__)
  38
  39 struct cpu;
  40
  41 extern __GNU_INLINE struct cpu *
  42 curcpup(void)
  43 {
  44         struct cpu *__value;
  45
  46 #if defined(__amd64)
  47         __asm__ __volatile__(
  48             "movq %%gs:0x10,%0"         /* CPU_SELF */
  49             : "=r" (__value));
  50 #elif defined(__i386)
  51         __asm__ __volatile__(
  52             "movl %%gs:0xc,%0"          /* CPU_SELF */
  53             : "=r" (__value));
  54 #else
  55 #error  "port me"
  56 #endif
  57         return (__value);
  58 }
  59
  60 #endif  /* !__lint && __GNUC__ */
  61
  62 #ifdef  __cplusplus
  63 }
  64 #endif
  65
  66 #endif  /* _ASM_CPUVAR_H */