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authorMarshall Mohror <mohror64@gmail.com>2022-07-06 19:42:01 +0200
committerMarshall Mohror <mohror64@gmail.com>2022-07-06 19:42:01 +0200
commitb2ad4dd189135be9a87af86619d6f5854525f7fa (patch)
treed290710b8975e063db7c38ef497e46cfdc71301f /src/common/x64
parentMerge pull request #8486 from liushuyu/github-actions-verify (diff)
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Diffstat (limited to 'src/common/x64')
-rw-r--r--src/common/x64/cpu_detect.cpp13
-rw-r--r--src/common/x64/cpu_detect.h5
2 files changed, 18 insertions, 0 deletions
diff --git a/src/common/x64/cpu_detect.cpp b/src/common/x64/cpu_detect.cpp
index 322aa1f08..4230b2da6 100644
--- a/src/common/x64/cpu_detect.cpp
+++ b/src/common/x64/cpu_detect.cpp
@@ -161,6 +161,19 @@ static CPUCaps Detect() {
caps.invariant_tsc = Common::Bit<8>(cpu_id[3]);
}
+ if (max_std_fn >= 0x15) {
+ __cpuid(cpu_id, 0x15);
+ caps.tsc_crystal_ratio_denominator = cpu_id[0];
+ caps.tsc_crystal_ratio_numerator = cpu_id[1];
+ caps.crystal_frequency = cpu_id[2];
+ // Some CPU models might not return a crystal frequency.
+ // 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 (max_std_fn >= 0x16) {
__cpuid(cpu_id, 0x16);
caps.base_frequency = cpu_id[0];
diff --git a/src/common/x64/cpu_detect.h b/src/common/x64/cpu_detect.h
index 9bdc9dbfa..6830f3795 100644
--- a/src/common/x64/cpu_detect.h
+++ b/src/common/x64/cpu_detect.h
@@ -30,6 +30,11 @@ struct CPUCaps {
u32 max_frequency;
u32 bus_frequency;
+ u32 tsc_crystal_ratio_denominator;
+ u32 tsc_crystal_ratio_numerator;
+ u32 crystal_frequency;
+ u64 tsc_frequency; // Derived from the above three values
+
bool sse : 1;
bool sse2 : 1;
bool sse3 : 1;