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Diffstat (limited to 'src/VBox/ValidationKit/bootsectors/bs3-timing-1-32.c32')
| -rw-r--r-- | src/VBox/ValidationKit/bootsectors/bs3-timing-1-32.c32 | 363 |
1 files changed, 363 insertions, 0 deletions
diff --git a/src/VBox/ValidationKit/bootsectors/bs3-timing-1-32.c32 b/src/VBox/ValidationKit/bootsectors/bs3-timing-1-32.c32 new file mode 100644 index 00000000..95befae9 --- /dev/null +++ b/src/VBox/ValidationKit/bootsectors/bs3-timing-1-32.c32 @@ -0,0 +1,363 @@ +/* $Id: bs3-timing-1-32.c32 $ */ +/** @file + * BS3Kit - bs3-timinig-1, 32-bit C code. + */ + +/* + * Copyright (C) 2007-2023 Oracle and/or its affiliates. + * + * This file is part of VirtualBox base platform packages, as + * available from https://www.virtualbox.org. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, in version 3 of the + * License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <https://www.gnu.org/licenses>. + * + * The contents of this file may alternatively be used under the terms + * of the Common Development and Distribution License Version 1.0 + * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included + * in the VirtualBox distribution, in which case the provisions of the + * CDDL are applicable instead of those of the GPL. + * + * You may elect to license modified versions of this file under the + * terms and conditions of either the GPL or the CDDL or both. + * + * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0 + */ + + +/********************************************************************************************************************************* +* Header Files * +*********************************************************************************************************************************/ +#ifndef STANDALONE_EXECUTABLE +# include <bs3kit.h> +#endif +#include <iprt/asm-amd64-x86.h> +#include <iprt/asm-math.h> +#include <iprt/asm.h> +#include <iprt/uint128.h> + + +/********************************************************************************************************************************* +* Structures and Typedefs * +*********************************************************************************************************************************/ +/** TSC timing results. */ +typedef struct BS3TIMING1RESULT +{ + /** Number of nanoseconds elapsed while testing. */ + uint64_t cNsElapsed; + /** Number of CPU ticks elapsed while testing. */ + uint64_t cTicksElapsed; + /** The minium number of ticks between TSC reads. */ + uint64_t cTicksMin; + /** The maximum number of ticks between TSC reads. */ + uint64_t cTicksMax; + /** The sum of all TSC read deltas. */ + uint64_t cTicksSum; + /** Number of loops (TSC read deltas). */ + uint64_t cTotalLoops; + /** Number of times TSC moved backwards. */ + uint64_t cBackwards; + /** Approx log2(cTicks) distribution. */ + uint64_t aDistribution[65]; +} BS3TIMING1RESULT; + + +/********************************************************************************************************************************* +* Global Variables * +*********************************************************************************************************************************/ +/** The total result. */ +static BS3TIMING1RESULT g_TotalResult; + +/** Set if history wrapped (i.e. table is full). */ +static bool g_fBigHistoryWrapped = false; +/** The next history entry. */ +static uint32_t g_iBigHistory; +/** History of large gaps. */ +static struct { uint64_t uTsc, cTicksDelta; } g_aBigHistory[384]; + + + +/** + * Pretty prints + */ +static void bs3Timing1_PrintTicks(uint64_t cTicks, uint64_t uCpuFreq) +{ + if (uCpuFreq > _128M) + { + if (cTicks >= uCpuFreq * 1000) + Bs3TestPrintf("%'RU64s", cTicks / uCpuFreq); + else + { + const char *pszUnit; + uint64_t uValue; + if (cTicks >= uCpuFreq) + { + pszUnit = "s"; + uValue = (cTicks * RT_MS_1SEC) / uCpuFreq; + } + else if (cTicks * RT_MS_1SEC >= uCpuFreq) + { + pszUnit = "ms"; + uValue = (cTicks * RT_US_1SEC) / uCpuFreq; + } + else if (cTicks * RT_US_1SEC >= uCpuFreq) + { + pszUnit = "us"; + uValue = (cTicks * RT_NS_1SEC) / uCpuFreq; + } + else if (cTicks * RT_NS_1SEC >= uCpuFreq) + { + pszUnit = "ns"; + uValue = (cTicks * UINT64_C(1000000000000)) / uCpuFreq; + } + else + { + Bs3TestPrintf("%'RU64ps", (cTicks * UINT64_C(1000000000000)) / uCpuFreq); + return; + } + Bs3TestPrintf("%u.%03u%s (%'RU64 ticks)", (uint32_t)uValue / 1000, (uint32_t)uValue % 1000, pszUnit, cTicks); + } + } + else + Bs3TestPrintf("%'RU64 ticks", cTicks); +} + + +/** + * Prints a result. + * + * @param pResult The result to print. + * @param iRun The run (loop in qpc parlance). + * @param uVerbosity The verbosity level. + */ +static void bs3Timing1_PrintResult(BS3TIMING1RESULT const *pResult, unsigned iRun, unsigned uVerbosity) +{ + uint64_t uCpuFreq; + + /* + * Calc CPU frequency. + */ + if (pResult->cNsElapsed > 0 && pResult->cTicksElapsed > 0) + { +#if 1 + RTUINT128U Tmp1, Divisor, Result; + RTUInt128Div(&Result, + RTUInt128MulU64ByU64(&Tmp1, pResult->cTicksElapsed, RT_NS_1SEC), + RTUInt128AssignU64(&Divisor, pResult->cNsElapsed)); + uCpuFreq = Result.s.Lo; +#else + unsigned const cShift = pResult->cTicksElapsed < UINT64_C(0x000225C17D04) ? 0 + : pResult->cTicksElapsed < UINT64_C(0x00225C17D04D) ? 4 + : pResult->cTicksElapsed < UINT64_C(0x0225C17D04DA) ? 8 + : pResult->cTicksElapsed < UINT64_C(0x225C1D940BF6) ? 12 + : 16; + uCpuFreq = pResult->cTicksElapsed * ((uint64_t)RT_NS_1SEC >> cShift) / (pResult->cNsElapsed >> cShift); +#endif + } + else + uCpuFreq = 1; + + /* + * Report results. + * + * Note! in 32-bit and 16-bit mode, values 4G or higher gets formatted as + * hexadecimal to avoid 64-bit division. + */ + Bs3TestPrintf("Loop #%u: %'RU64 tests: ", iRun, pResult->cTotalLoops); + + Bs3TestPrintf("average "); + bs3Timing1_PrintTicks(pResult->cTicksSum / pResult->cTotalLoops, uCpuFreq); + Bs3TestPrintf(", min "); + bs3Timing1_PrintTicks(pResult->cTicksMin, uCpuFreq); + Bs3TestPrintf(", max "); + bs3Timing1_PrintTicks(pResult->cTicksMax, uCpuFreq); + Bs3TestPrintf("\n"); + + /* Distribution (tick delta log2-ish). */ + if (uVerbosity > 0) + { + unsigned iItem = 0; + unsigned i; + for (i = uVerbosity > 1 ? 0 : 5; i < RT_ELEMENTS(pResult->aDistribution); i++) + if (pResult->aDistribution[i] != 0) + { + if (iItem >= 6) + { + iItem = 0; + Bs3TestPrintf("\n"); + } + iItem++; + Bs3TestPrintf(" %'11RU64|2^%-2u", pResult->aDistribution[i], i); + } + if (uVerbosity > 1) + Bs3TestPrintf(iItem < 6 ? " (%'RU64 Hz)\n" : "\n (%'RU64 Hz)\n", uCpuFreq); + else + Bs3TestPrintf("\n"); + } + if (pResult->cBackwards != 0) + Bs3TestFailedF("TSC went backwards %'RU64 time(s)", pResult->cBackwards); +} + + +/** + * Do one TSC timing iteration. + * + * @param iRun The iteration number (loop). + * @param cSecs The number of seconds to sample TSCs. + * @param uVerbosity The noise level. + * @param iMinHistory The threshold level to put stuff in g_auTscHistory. + */ +static void bs3Timing1_Tsc_One(unsigned iRun, uint32_t cSecs, unsigned uVerbosity, unsigned iMinHistory) +{ + uint64_t const nsStart = Bs3TestNow(); + uint64_t const uTscStart = ASMReadTSC(); + uint64_t const nsDeadline = nsStart + cSecs * RT_NS_1SEC_64; + uint64_t cNsElapsed; + BS3TIMING1RESULT Result; + unsigned i; + + Bs3MemZero(&Result, sizeof(Result)); + Result.cTicksMin = UINT64_MAX; + + /* + * Test loop. + */ + do + { + unsigned cLoops = 100000 + 1; + Result.cTotalLoops += cLoops - 1; + while (--cLoops != 0) + { + uint64_t uTscPrev = ASMReadTSC(); + uint64_t uTscNow = ASMReadTSC(); + uint64_t cTicks = uTscNow - uTscPrev; + unsigned iBit; + + /* check that it doesn't go backwards*/ + if ((int64_t)cTicks < 0) + Result.cBackwards++; + + /* min/max/avg */ + Result.cTicksSum += cTicks; + if (cTicks < Result.cTicksMin) + Result.cTicksMin = cTicks; + if (cTicks > Result.cTicksMax) + Result.cTicksMax = cTicks; + + /* result distribution by most significant bit. */ + iBit = ASMBitLastSetU64(cTicks); + Result.aDistribution[iBit] += 1; + if (iBit < iMinHistory) + { /* likely */ } + else + { + g_aBigHistory[g_iBigHistory].uTsc = uTscPrev; + g_aBigHistory[g_iBigHistory].cTicksDelta = cTicks; + if (++g_iBigHistory >= RT_ELEMENTS(g_aBigHistory)) + { + g_iBigHistory = 0; + g_fBigHistoryWrapped = true; + } + } + } + } while ((cNsElapsed = Bs3TestNow()) < nsDeadline); + + Result.cTicksElapsed = ASMReadTSC() - uTscStart; + Result.cNsElapsed = cNsElapsed - nsStart; + + bs3Timing1_PrintResult(&Result, iRun, uVerbosity); + + /* Add to total. */ + g_TotalResult.cNsElapsed += Result.cNsElapsed; + g_TotalResult.cTicksElapsed += Result.cTicksElapsed; + if (Result.cTicksMin < g_TotalResult.cTicksMin || g_TotalResult.cTicksMin == 0) + g_TotalResult.cTicksMin = Result.cTicksMin; + if (Result.cTicksMax > g_TotalResult.cTicksMax) + g_TotalResult.cTicksMax += Result.cTicksMax; + g_TotalResult.cTicksSum += Result.cTicksSum; + g_TotalResult.cTotalLoops += Result.cTotalLoops; + g_TotalResult.cBackwards += Result.cBackwards; + for (i = 0; i < RT_ELEMENTS(Result.aDistribution); i++) + g_TotalResult.aDistribution[i] += Result.aDistribution[i]; +} + + +/** + * The TSC test driver. + * + * @param cLoops Number of test iterations. + * @param cSecs The number of seconds per iteration. + * @param uVerbosity How noisy we should be. + * @param iMinHistory The threshold for big gap history. + */ +static void bs3Timing1_Tsc_Driver(unsigned cLoops, unsigned cSecs, unsigned uVerbosity, unsigned iMinHistory) +{ + unsigned iLoop; + +#if 1 + /* + * Verify that the first/last bit in U64 works (didn't). + */ + iLoop = ASMBitLastSetU64( UINT64_C(0x1000100010001000)); if (iLoop != 61) Bs3TestFailedF("%d: iLoop=%d\n", __LINE__, iLoop); + iLoop = ASMBitFirstSetU64(UINT64_C(0x1000100010001000)); if (iLoop != 13) Bs3TestFailedF("%d: iLoop=%d\n", __LINE__, iLoop); + iLoop = ASMBitLastSetU64( UINT64_C(0x000ffff000000000)); if (iLoop != 52) Bs3TestFailedF("%d: iLoop=%d\n", __LINE__, iLoop); + iLoop = ASMBitFirstSetU64(UINT64_C(0x000ffff000000000)); if (iLoop != 37) Bs3TestFailedF("%d: iLoop=%d\n", __LINE__, iLoop); +#endif + + /* + * Do the work. + */ + Bs3TestPrintf("Running %u loops, %u second%s each...\n", cLoops, cSecs, cSecs != 1 ? "s" : ""); + for (iLoop = 1; iLoop <= cLoops; iLoop++) + bs3Timing1_Tsc_One(iLoop, cSecs, uVerbosity, iMinHistory); + + /* + * Report the total. + */ + Bs3TestPrintf("Total:\n"); + bs3Timing1_PrintResult(&g_TotalResult, iLoop, uVerbosity + 1); + + /* + * Dump the large gap history, if any. + */ + if (g_fBigHistoryWrapped || g_iBigHistory > 0) + { + uint32_t const iFirst = g_fBigHistoryWrapped ? g_iBigHistory : 0; + uint32_t const iEnd = g_iBigHistory; + uint64_t uTscPrev = g_aBigHistory[iFirst].uTsc; + uint32_t i = iFirst; + Bs3TestPrintf("Big gap history (TSC, prev delta, test delta|level):\n"); + do + { + Bs3TestPrintf(" %'RU64: %'14RU64 - %'14RU64|%u\n", g_aBigHistory[i].uTsc, g_aBigHistory[i].uTsc - uTscPrev, + g_aBigHistory[i].cTicksDelta, ASMBitLastSetU64(g_aBigHistory[i].cTicksDelta)); + uTscPrev = g_aBigHistory[i].uTsc; + if (++i >= RT_ELEMENTS(g_aBigHistory)) + i = 0; + } while (i != iEnd); + } + else + Bs3TestPrintf("No big gap history.\n"); +} + + +#ifndef STANDALONE_EXECUTABLE +BS3_DECL(void) bs3Timing1_Tsc_pe32(void) +{ + Bs3TestPrintf("bs3Timing1_Tsc_pe32\n"); + bs3Timing1_Tsc_Driver(60, 10 /*sec*/, 1 /*uVerbosity*/, 17); +} +#endif + +/* P.S. don't forget: VBoxManage setextradata bs3-timing-1 VBoxInternal/Devices/VMMDev/0/Config/TestingEnabled 1 */ + |