| 1 | /* $Id: SUPLibAll.cpp 54226 2015-02-16 22:52:18Z vboxsync $ */
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| 2 | /** @file
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| 3 | * VirtualBox Support Library - All Contexts Code.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2014 Oracle Corporation
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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 (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | *
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| 17 | * The contents of this file may alternatively be used under the terms
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| 18 | * of the Common Development and Distribution License Version 1.0
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| 19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 20 | * VirtualBox OSE distribution, in which case the provisions of the
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| 21 | * CDDL are applicable instead of those of the GPL.
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| 22 | *
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| 23 | * You may elect to license modified versions of this file under the
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| 24 | * terms and conditions of either the GPL or the CDDL or both.
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| 25 | */
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| 26 |
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| 27 | /*******************************************************************************
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| 28 | * Header Files *
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| 29 | *******************************************************************************/
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| 30 | #include <VBox/sup.h>
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| 31 | #ifdef IN_RING0
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| 32 | # include <iprt/mp.h>
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| 33 | #endif
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| 34 | #if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)
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| 35 | # include <iprt/asm-amd64-x86.h>
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| 36 | #endif
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| 37 |
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| 38 |
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| 39 | #if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)
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| 40 |
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| 41 | /**
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| 42 | * The slow case for SUPReadTsc where we need to apply deltas.
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| 43 | *
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| 44 | * Must only be called when deltas are applicable, so please do not call it
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| 45 | * directly.
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| 46 | *
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| 47 | * @returns TSC with delta applied.
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| 48 | *
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| 49 | * @remarks May be called with interrupts disabled in ring-0! This is why the
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| 50 | * ring-0 code doesn't attempt to figure the delta.
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| 51 | *
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| 52 | * @internal
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| 53 | */
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| 54 | SUPDECL(uint64_t) SUPReadTscWithDelta(void)
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| 55 | {
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| 56 | PSUPGLOBALINFOPAGE pGip = g_pSUPGlobalInfoPage;
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| 57 | Assert(GIP_ARE_TSC_DELTAS_APPLICABLE(pGip));
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| 58 |
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| 59 | /** @todo Check out the rdtscp optimization, ASMGetApicId is very expensive. */
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| 60 |
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| 61 | # ifdef IN_RING3
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| 62 | /*
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| 63 | * Read the TSC and delta.
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| 64 | */
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| 65 | uint32_t cTries = 0;
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| 66 | for (;;)
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| 67 | {
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| 68 | uint8_t idApic = ASMGetApicId();
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| 69 | uint64_t uTsc = ASMReadTSC();
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| 70 | int64_t iTscDelta = pGip->aCPUs[pGip->aiCpuFromApicId[idApic]].i64TSCDelta;
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| 71 | if (RT_LIKELY( idApic == ASMGetApicId()
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| 72 | || cTries >= 10))
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| 73 | {
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| 74 | /*
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| 75 | * If the delta is valid, apply it.
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| 76 | */
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| 77 | if (RT_LIKELY(iTscDelta != INT64_MAX))
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| 78 | return uTsc - iTscDelta;
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| 79 |
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| 80 | /*
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| 81 | * The delta needs calculating, call supdrv to get the TSC.
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| 82 | */
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| 83 | int rc = SUPR3ReadTsc(&uTsc, NULL);
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| 84 | if (RT_SUCCESS(rc))
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| 85 | return uTsc;
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| 86 | AssertMsgFailed(("SUPR3ReadTsc -> %Rrc\n", rc));
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| 87 |
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| 88 | /* That didn't work, just return something half useful... */
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| 89 | return ASMReadTSC();
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| 90 | }
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| 91 | cTries++;
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| 92 | }
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| 93 | # else
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| 94 | /*
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| 95 | * Read the TSC and delta.
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| 96 | */
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| 97 | RTCCUINTREG uFlags = ASMIntDisableFlags();
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| 98 | # ifdef IN_RING0
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| 99 | int iCpuSet = RTMpCpuIdToSetIndex(RTMpCpuId());
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| 100 | uint16_t iGipCpu = (unsigned)iCpuSet < RT_ELEMENTS(pGip->aiCpuFromCpuSetIdx)
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| 101 | ? pGip->aiCpuFromCpuSetIdx[iCpuSet] : UINT16_MAX;
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| 102 | # else
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| 103 | uint16_t idApic = ASMGetApicId(); /** @todo this could probably be eliminated in RC if we really wanted to... */
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| 104 | uint16_t iGipCpu = (unsigned)idApic < RT_ELEMENTS(pGip->aiCpuFromApicId) /* for the future */
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| 105 | ? pGip->aiCpuFromApicId[idApic] : UINT16_MAX;
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| 106 | # endif
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| 107 | int64_t iTscDelta = (unsigned)iGipCpu < pGip->cCpus ? pGip->aCPUs[iGipCpu].i64TSCDelta : INT64_MAX;
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| 108 | uint64_t uTsc = ASMReadTSC();
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| 109 | ASMSetFlags(uFlags);
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| 110 |
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| 111 | /*
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| 112 | * If the delta is valid, apply it, otherwise ignore it (really shouldn't
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| 113 | * happen in these contexts!).
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| 114 | */
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| 115 | if (RT_LIKELY(iTscDelta != INT64_MAX))
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| 116 | return uTsc - iTscDelta;
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| 117 | # ifdef IN_RING0
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| 118 | AssertMsgFailed(("iCpuSet=%d (%#x) iGipCpu=%#x\n", iCpuSet, iCpuSet, iGipCpu));
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| 119 | # else
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| 120 | AssertMsgFailed(("idApic=%#x iGipCpu=%#x\n", idApic, iGipCpu));
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| 121 | # endif
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| 122 | return uTsc;
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| 123 | # endif
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| 124 | }
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| 125 |
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| 126 | #endif /* RT_ARCH_AMD64 || RT_ARCH_X86 */
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| 127 |
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