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
  38 struct cpu;
  39
  40 extern __GNU_INLINE struct cpu *
  41 curcpup(void)
  42 {
  43         struct cpu *__value;
  44
  45 #if defined(__amd64)
  46         __asm__ __volatile__(
  47             "movq %%gs:0x10,%0"         /* CPU_SELF */
  48             : "=r" (__value));
  49 #elif defined(__i386)
  50         __asm__ __volatile__(
  51             "movl %%gs:0xc,%0"          /* CPU_SELF */
  52             : "=r" (__value));
  53 #else
  54 #error  "port me"
  55 #endif
  56         return (__value);
  57 }
  58
  59
  60 #ifdef  __cplusplus
  61 }
  62 #endif
  63
  64 #endif  /* _ASM_CPUVAR_H */