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/******************************************************************************
Copyright (c) 2009-2012, Intel Corporation
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
3. Neither the name of the Intel Corporation nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
******************************************************************************/
/**@file*/
#ifndef TSC_HPP
#define TSC_HPP
#include <intrin.h>
#include <stdint.h>
/**
* @brief Gets the processor timestamp
* @return processor timestamp
*/
inline unsigned __int64 PLAT_rdtsc()
{
return __rdtsc();
}
#define CLOCK_INFO_CPUID_LEAF (0x15)
#define SYSTEM_CLOCK_24MHZ (24000000)
#define MAX_MODEL_LIST_LEN (2)
typedef struct
{
short model_list[MAX_MODEL_LIST_LEN+1]; // Terminate model list with -1
uint32_t clock_rate; // clock_rate of 0 is invalid
}
ModelNumberSystemClockRateMapping;
static ModelNumberSystemClockRateMapping ModelNumberSystemClockRateMap[] =
{
{{ 0x5E, 0x4E, -1 }, SYSTEM_CLOCK_24MHZ },
{{ -1 }, 0 },
};
/**
* @brief Gets the system clock frequency using CPU model number
* @param model_query model number to look up
* @return System frequency, or 0 on error
*/
inline uint32_t FindFrequencyByModel(uint8_t model_query) {
ModelNumberSystemClockRateMapping *map = ModelNumberSystemClockRateMap;
uint32_t ret = 0;
while (map->clock_rate != 0)
{
short *model = map->model_list;
while (*model != -1)
{
if (*model == model_query) {
ret = map->clock_rate;
break;
}
++model;
}
++map;
}
return ret;
}
/**
* @brief Gets the TSC frequnecy
* @param builtin whether device is connected to the Intel bus (not PCIE)
* @return TSC frequency, or 0 on error
*/
inline uint64_t getTSCFrequency( bool builtin ) {
int max_cpuid_level;
int tmp[4];
BOOL is_windows_10;
LARGE_INTEGER freq;
// Find the max cpuid level, and if possible find clock info
__cpuid(tmp, 0);
max_cpuid_level = tmp[0];
if (max_cpuid_level >= CLOCK_INFO_CPUID_LEAF)
__cpuid(tmp, CLOCK_INFO_CPUID_LEAF);
// Determine if the OS is Windows 10 or later.
{
OSVERSIONINFOEXW osvi = { sizeof(osvi), 0, 0, 0, 0, {0}, 0, 0 };
DWORDLONG const dwlConditionMask = VerSetConditionMask(0, VER_MAJORVERSION, VER_GREATER_EQUAL);
osvi.dwMajorVersion = 10;
// NOTE: VerifyVersionInfo returns false when called by applications that do not have a compatibility manifest for Windows 10,
// even when the current operating system version is Windows 10.
is_windows_10 = VerifyVersionInfoW(&osvi, VER_MAJORVERSION, dwlConditionMask) != FALSE;
}
// For pre-Win10 on 6th Generation or greater Intel CPUs the raw hardware
// clock will be returned, *else* use QPC for everything else
//
// EAX (tmp[0]) must be >= 1, See Intel SDM 17.15.4 "Invariant Time-keeping"
if (!is_windows_10 &&
max_cpuid_level >= CLOCK_INFO_CPUID_LEAF &&
tmp[0] >= 1 &&
builtin )
{
SYSTEM_INFO info;
GetSystemInfo(&info);
// Look at processor model (upper byte of revision) number to determine clock rate
return FindFrequencyByModel(info.wProcessorRevision >> 8);
}
if (QueryPerformanceFrequency(&freq))
return freq.QuadPart;
return 0;
}
#endif/*TSC_HPP*/
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