| 1 | /* $Id: TMAllCpu.cpp 23 2007-01-15 14:08:28Z 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 |
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| 31 | #include <VBox/param.h>
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| 32 | #include <VBox/err.h>
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| 33 | #include <iprt/assert.h>
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| 34 | #include <iprt/asm.h>
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| 35 |
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| 36 |
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| 37 | /**
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| 38 | * Resumes the CPU timestamp counter ticking.
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| 39 | *
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| 40 | * @returns VBox status code.
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| 41 | * @param pVM The VM to operate on.
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| 42 | */
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| 43 | TMDECL(int) TMCpuTickResume(PVM pVM)
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| 44 | {
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| 45 | if (!pVM->tm.s.fTSCTicking)
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| 46 | {
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| 47 | pVM->tm.s.fTSCTicking = true;
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| 48 | #ifndef TM_REAL_CPU_TICK
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| 49 | pVM->tm.s.u64TSCOffset = ASMReadTSC() - pVM->tm.s.u64TSC;
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| 50 | #endif
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| 51 | return VINF_SUCCESS;
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| 52 | }
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| 53 | AssertFailed();
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| 54 | return VERR_INTERNAL_ERROR;
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| 55 | }
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| 56 |
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| 57 |
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| 58 | /**
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| 59 | * Pauses the CPU timestamp counter ticking.
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| 60 | *
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| 61 | * @returns VBox status code.
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| 62 | * @param pVM The VM to operate on.
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| 63 | */
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| 64 | TMDECL(int) TMCpuTickPause(PVM pVM)
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| 65 | {
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| 66 | if (pVM->tm.s.fTSCTicking)
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| 67 | {
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| 68 | #ifndef TM_REAL_CPU_TICK
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| 69 | pVM->tm.s.u64TSC = ASMReadTSC() - pVM->tm.s.u64TSCOffset;
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| 70 | #endif
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| 71 | pVM->tm.s.fTSCTicking = false;
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| 72 | return VINF_SUCCESS;
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| 73 | }
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| 74 | AssertFailed();
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| 75 | return VERR_INTERNAL_ERROR;
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| 76 | }
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| 77 |
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| 78 |
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| 79 |
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| 80 | /**
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| 81 | * Read the current CPU timstamp counter.
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| 82 | *
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| 83 | * @returns Gets the CPU tsc.
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| 84 | * @param pVM The VM to operate on.
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| 85 | */
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| 86 | TMDECL(uint64_t) TMCpuTickGet(PVM pVM)
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| 87 | {
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| 88 | #ifdef TM_REAL_CPU_TICK
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| 89 | return ASMReadTSC();
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| 90 | #else
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| 91 | if (pVM->tm.s.fTSCTicking)
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| 92 | return ASMReadTSC() - pVM->tm.s.u64TSCOffset;
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| 93 | return pVM->tm.s.u64TSC;
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| 94 | #endif
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| 95 | }
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| 96 |
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| 97 |
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| 98 | /**
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| 99 | * Sets the current CPU timestamp counter.
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| 100 | *
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| 101 | * @returns VBox status code.
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| 102 | * @param pVM The VM to operate on.
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| 103 | * @param u64Tick The new timestamp value.
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| 104 | */
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| 105 | TMDECL(int) TMCpuTickSet(PVM pVM, uint64_t u64Tick)
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| 106 | {
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| 107 | Assert(!pVM->tm.s.fTSCTicking);
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| 108 | pVM->tm.s.u64TSC = u64Tick;
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| 109 | return VINF_SUCCESS;
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| 110 | }
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| 111 |
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| 112 |
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| 113 | /**
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| 114 | * Get the timestamp frequency.
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| 115 | *
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| 116 | * @returns Number of ticks per second.
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| 117 | * @param pVM The VM.
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| 118 | */
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| 119 | TMDECL(uint64_t) TMCpuTicksPerSecond(PVM pVM)
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| 120 | {
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| 121 | return pVM->tm.s.cTSCTicksPerSecond;
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| 122 | }
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| 123 |
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