osfmk/i386/tsc.h

   1 /*
   2  * Copyright (c) 2004-2007 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*
  29  * @OSF_COPYRIGHT@
  30  */
  31 /*
  32  * @APPLE_FREE_COPYRIGHT@
  33  */
  34 /*
  35  *      File:           tsc.h
  36  *      Purpose:        Contains the TSC initialization and conversion
  37  *                      factors.
  38  */
  39 #ifdef KERNEL_PRIVATE
  40 #ifndef _I386_TSC_H_
  41 #define _I386_TSC_H_
  42
  43 #define BASE_NHM_CLOCK_SOURCE   133333333ULL
  44 #define IA32_PERF_STS           0x198
  45 #define SLOW_TSC_THRESHOLD      1000067800      /* TSC is too slow for regular nanotime() algorithm */
  46
  47 #ifndef ASSEMBLER
  48 extern uint64_t busFCvtt2n;
  49 extern uint64_t busFCvtn2t;
  50 extern uint64_t tscFreq;
  51 extern uint64_t tscFCvtt2n;
  52 extern uint64_t tscFCvtn2t;
  53 extern uint64_t tscGranularity;
  54 extern uint64_t bus2tsc;
  55 extern uint64_t busFreq;
  56 extern uint32_t flex_ratio;
  57 extern uint32_t flex_ratio_min;
  58 extern uint32_t flex_ratio_max;
  59
  60 struct tscInfo
  61 {
  62         uint64_t        busFCvtt2n;
  63         uint64_t        busFCvtn2t;
  64         uint64_t        tscFreq;
  65         uint64_t        tscFCvtt2n;
  66         uint64_t        tscFCvtn2t;
  67         uint64_t        tscGranularity;
  68         uint64_t        bus2tsc;
  69         uint64_t        busFreq;
  70         uint32_t        flex_ratio;
  71         uint32_t        flex_ratio_min;
  72         uint32_t        flex_ratio_max;
  73 };
  74 typedef struct tscInfo tscInfo_t;
  75
  76 extern void tsc_get_info(tscInfo_t *info);
  77
  78 extern void tsc_init(void);
  79 #endif /* ASSEMBLER */
  80 #endif /* _I386_TSC_H_ */
  81 #endif /* KERNEL_PRIVATE */