diff options
Diffstat (limited to 'daemons/gptp/windows/daemon_cl/tsc.hpp')
| -rw-r--r-- | daemons/gptp/windows/daemon_cl/tsc.hpp | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/daemons/gptp/windows/daemon_cl/tsc.hpp b/daemons/gptp/windows/daemon_cl/tsc.hpp index ed22752c..425205d3 100644 --- a/daemons/gptp/windows/daemon_cl/tsc.hpp +++ b/daemons/gptp/windows/daemon_cl/tsc.hpp @@ -95,13 +95,14 @@ inline uint32_t FindFrequencyByModel(uint8_t model_query) { /** * @brief Gets the TSC frequnecy - * @param millis time in miliseconds + * @param builtin whether device is connected to the Intel bus (not PCIE) * @return TSC frequency, or 0 on error */ -inline uint64_t getTSCFrequency( unsigned millis ) { +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); @@ -124,9 +125,11 @@ inline uint64_t getTSCFrequency( unsigned millis ) { // 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 && + if (!is_windows_10 && max_cpuid_level >= CLOCK_INFO_CPUID_LEAF && - tmp[0] >= 1) { + tmp[0] >= 1 && + builtin ) + { SYSTEM_INFO info; GetSystemInfo(&info); @@ -135,8 +138,6 @@ inline uint64_t getTSCFrequency( unsigned millis ) { return FindFrequencyByModel(info.wProcessorRevision >> 8); } - LARGE_INTEGER freq; - if (QueryPerformanceFrequency(&freq)) return freq.QuadPart; |