osfmk/i386/tsc.h

   1 /*
   2  * Copyright (c) 2004-2006 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*
  23  * @OSF_COPYRIGHT@
  24  */
  25 /*
  26  * @APPLE_FREE_COPYRIGHT@
  27  */
  28 /*
  29  *      File:           tsc.h
  30  *      Purpose:        Contains the TSC initialization and conversion
  31  *                      factors.
  32  */
  33 #ifdef KERNEL_PRIVATE
  34 #ifndef _I386_TSC_H_
  35 #define _I386_TSC_H_
  36
  37 #define BusRatioShift 40
  38 #define BusRatioMask 0x1F
  39 #define IA32_PERF_STS 0x198
  40
  41 extern uint64_t busFCvtt2n;
  42 extern uint64_t busFCvtn2t;
  43 extern uint64_t tscFreq;
  44 extern uint64_t tscFCvtt2n;
  45 extern uint64_t tscFCvtn2t;
  46 extern uint64_t tscGranularity;
  47 extern uint64_t bus2tsc;
  48
  49 struct tscInfo
  50 {
  51 uint64_t        busFCvtt2n;
  52 uint64_t        busFCvtn2t;
  53 uint64_t        tscFreq;
  54 uint64_t        tscFCvtt2n;
  55 uint64_t        tscFCvtn2t;
  56 uint64_t        tscGranularity;
  57 uint64_t        bus2tsc;
  58 };
  59 typedef struct tscInfo tscInfo_t;
  60
  61 extern void tsc_get_info(tscInfo_t *info);
  62
  63 extern void tsc_init(void);
  64
  65 #endif /* _I386_TSC_H_ */
  66 #endif /* KERNEL_PRIVATE */