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authorMarshall Mohror <mohror64@gmail.com>2022-07-06 20:00:00 +0200
committerMarshall Mohror <mohror64@gmail.com>2022-07-06 20:00:00 +0200
commite71d457af923f373505729fe5a335e6768f6144a (patch)
tree535a7a3ddd28e3a98f5984e0730277cd74850cea /src/common/x64
parentcommon/x64: Use TSC clock rate from CPUID when available (diff)
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Diffstat (limited to 'src/common/x64')
-rw-r--r--src/common/x64/cpu_detect.cpp7
1 files changed, 5 insertions, 2 deletions
diff --git a/src/common/x64/cpu_detect.cpp b/src/common/x64/cpu_detect.cpp
index 4230b2da6..1a27532d4 100644
--- a/src/common/x64/cpu_detect.cpp
+++ b/src/common/x64/cpu_detect.cpp
@@ -170,8 +170,11 @@ static CPUCaps Detect() {
// The CPU model can be detected to use the values from turbostat
// https://github.com/torvalds/linux/blob/master/tools/power/x86/turbostat/turbostat.c#L5569
// but it's easier to just estimate the TSC tick rate for these cases.
- caps.tsc_frequency = static_cast<u64>(caps.crystal_frequency) *
- caps.tsc_crystal_ratio_numerator / caps.tsc_crystal_ratio_denominator;
+ if (caps.tsc_crystal_ratio_denominator) {
+ caps.tsc_frequency = static_cast<u64>(caps.crystal_frequency) *
+ caps.tsc_crystal_ratio_numerator /
+ caps.tsc_crystal_ratio_denominator;
+ }
}
if (max_std_fn >= 0x16) {