ppc/pthreads/init_cpu_capabilities.c

   1 /*
   2  * Copyright (c) 2003 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25
  26 /* Initialize the "_cpu_capabilities" vector on PowerPC processors. */
  27
  28 #define __APPLE_API_PRIVATE
  29 #include <machine/cpu_capabilities.h>
  30 #undef  __APPLE_API_PRIVATE
  31
  32 int _cpu_has_altivec = 0;               // DEPRECATED: use _cpu_capabilities instead
  33 int _cpu_capabilities = 0;
  34
  35 __private_extern__ void
  36 _init_cpu_capabilities( void )
  37 {
  38     _cpu_capabilities = *(int*) _COMM_PAGE_CPU_CAPABILITIES;    // pull out of commpage
  39
  40     _cpu_has_altivec = (_cpu_capabilities & kHasAltivec) ? 1 : 0;
  41 }