| 1 | /* $Id: TMAllCpu.cpp 1057 2007-02-23 20:38:37Z vboxsync $ */
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| 2 | /** @file
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| 3 | * TM - Timeout Manager, CPU Time, All Contexts.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006 InnoTek Systemberatung GmbH
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.virtualbox.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License as published by the Free Software Foundation,
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| 13 | * in version 2 as it comes in the "COPYING" file of the VirtualBox OSE
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| 14 | * distribution. VirtualBox OSE is distributed in the hope that it will
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| 15 | * be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | *
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| 17 | * If you received this file as part of a commercial VirtualBox
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| 18 | * distribution, then only the terms of your commercial VirtualBox
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| 19 | * license agreement apply instead of the previous paragraph.
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| 20 | */
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| 21 |
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| 22 |
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| 23 | /*******************************************************************************
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| 24 | * Header Files *
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| 25 | *******************************************************************************/
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| 26 | #define LOG_GROUP LOG_GROUP_TM
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| 27 | #include <VBox/tm.h>
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| 28 | #include "TMInternal.h"
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| 29 | #include <VBox/vm.h>
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| 30 | #include <VBox/sup.h>
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| 31 |
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| 32 | #include <VBox/param.h>
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| 33 | #include <VBox/err.h>
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| 34 | #include <iprt/assert.h>
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| 35 | #include <iprt/asm.h>
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| 36 |
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| 37 |
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| 38 | /**
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| 39 | * Gets the raw cpu tick from current virtual time.
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| 40 | */
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| 41 | DECLINLINE(uint64_t) tmCpuTickGetRawVirtual(PVM pVM)
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| 42 | {
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| 43 | uint64_t u64 = TMVirtualGet(pVM);
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| 44 | /** @todo calc tsc from virtual time. */
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| 45 | return u64;
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| 46 | }
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| 47 |
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| 48 |
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| 49 | /**
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| 50 | * Resumes the CPU timestamp counter ticking.
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| 51 | *
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| 52 | * @returns VBox status code.
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| 53 | * @param pVM The VM to operate on.
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| 54 | */
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| 55 | TMDECL(int) TMCpuTickResume(PVM pVM)
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| 56 | {
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| 57 | if (!pVM->tm.s.fTSCTicking)
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| 58 | {
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| 59 | pVM->tm.s.fTSCTicking = true;
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| 60 | if (pVM->tm.s.fTSCVirtualized)
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| 61 | {
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| 62 | if (pVM->tm.s.fTSCUseRealTSC)
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| 63 | pVM->tm.s.u64TSCOffset = ASMReadTSC() - pVM->tm.s.u64TSC;
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| 64 | else
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| 65 | pVM->tm.s.u64TSCOffset = tmCpuTickGetRawVirtual(pVM) - pVM->tm.s.u64TSC;
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| 66 | }
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| 67 | return VINF_SUCCESS;
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| 68 | }
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| 69 | AssertFailed();
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| 70 | return VERR_INTERNAL_ERROR;
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| 71 | }
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| 72 |
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| 73 |
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| 74 | /**
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| 75 | * Pauses the CPU timestamp counter ticking.
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| 76 | *
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| 77 | * @returns VBox status code.
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| 78 | * @param pVM The VM to operate on.
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| 79 | */
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| 80 | TMDECL(int) TMCpuTickPause(PVM pVM)
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| 81 | {
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| 82 | if (pVM->tm.s.fTSCTicking)
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| 83 | {
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| 84 | if (!pVM->tm.s.fTSCVirtualized)
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| 85 | {
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| 86 | if (pVM->tm.s.fTSCUseRealTSC)
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| 87 | pVM->tm.s.u64TSC = ASMReadTSC() - pVM->tm.s.u64TSCOffset;
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| 88 | else
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| 89 | pVM->tm.s.u64TSC = tmCpuTickGetRawVirtual(pVM) - pVM->tm.s.u64TSCOffset;
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| 90 | }
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| 91 | pVM->tm.s.fTSCTicking = false;
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| 92 | return VINF_SUCCESS;
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| 93 | }
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| 94 | AssertFailed();
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| 95 | return VERR_INTERNAL_ERROR;
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| 96 | }
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| 97 |
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| 98 |
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| 99 |
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| 100 | /**
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| 101 | * Read the current CPU timstamp counter.
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| 102 | *
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| 103 | * @returns Gets the CPU tsc.
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| 104 | * @param pVM The VM to operate on.
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| 105 | */
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| 106 | TMDECL(uint64_t) TMCpuTickGet(PVM pVM)
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| 107 | {
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| 108 | uint64_t u64;
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| 109 | if (pVM->tm.s.fTSCUseRealTSC)
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| 110 | u64 = ASMReadTSC();
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| 111 | else
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| 112 | {
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| 113 | if (pVM->tm.s.fTSCTicking)
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| 114 | {
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| 115 | if (pVM->tm.s.fTSCUseRealTSC)
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| 116 | u64 = ASMReadTSC() - pVM->tm.s.u64TSCOffset;
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| 117 | else
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| 118 | u64 = tmCpuTickGetRawVirtual(pVM) - pVM->tm.s.u64TSCOffset;
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| 119 | }
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| 120 | else
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| 121 | u64 = pVM->tm.s.u64TSC;
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| 122 | }
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| 123 | return u64;
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| 124 | }
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| 125 |
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| 126 |
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| 127 | /**
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| 128 | * Sets the current CPU timestamp counter.
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| 129 | *
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| 130 | * @returns VBox status code.
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| 131 | * @param pVM The VM to operate on.
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| 132 | * @param u64Tick The new timestamp value.
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| 133 | */
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| 134 | TMDECL(int) TMCpuTickSet(PVM pVM, uint64_t u64Tick)
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| 135 | {
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| 136 | Assert(!pVM->tm.s.fTSCTicking);
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| 137 | pVM->tm.s.u64TSC = u64Tick;
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| 138 | return VINF_SUCCESS;
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| 139 | }
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| 140 |
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| 141 |
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| 142 | /**
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| 143 | * Get the timestamp frequency.
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| 144 | *
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| 145 | * @returns Number of ticks per second.
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| 146 | * @param pVM The VM.
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| 147 | */
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| 148 | TMDECL(uint64_t) TMCpuTicksPerSecond(PVM pVM)
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| 149 | {
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| 150 | if (pVM->tm.s.fTSCUseRealTSC)
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| 151 | {
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| 152 | uint64_t cTSCTicksPerSecond = SUPGetCpuHzFromGIP(g_pSUPGlobalInfoPage);
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| 153 | if (RT_LIKELY(cTSCTicksPerSecond != ~(uint64_t)0))
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| 154 | return cTSCTicksPerSecond;
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| 155 | }
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| 156 | return pVM->tm.s.cTSCTicksPerSecond;
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| 157 | }
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| 158 |
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