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Merge pull request #3779 from Sonicadvance1/cpuinfo_cyclecounter

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Linux: Calculate cycle counter frequency for cpuinfo
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Ryan Houdek 2024-06-29 11:58:32 -07:00 committed by GitHub
commit 76f3391ebc
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1 changed files with 11 additions and 1 deletions
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12
Source/Tools/LinuxEmulation/LinuxSyscalls/EmulatedFiles/EmulatedFiles.cpp
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@ -375,6 +375,16 @@ fextl::string GenerateCPUInfo(FEXCore::Context::Context* ctx, uint32_t CPUCores)
FLAG(res_7.edx & (1 << 28), "flush_l1d") FLAG(res_7.edx & (1 << 29), "arch_capabilities")
}
// Get the cycle counter frequency from CPUID function 15h.
auto res_15 = ctx->RunCPUIDFunction(0x15, 0);
// Frequency is calculated in Hz, we need to convert it to megahertz since FEX is guaranteed to return >= 1Ghz.
constexpr double HzInMhz = 1000000.0;
double Frequency = 1.0 / (static_cast<double>(res_15.eax) / (static_cast<double>(res_15.ebx) * static_cast<double>(res_15.ecx)));
Frequency /= HzInMhz;
// Generate the cycle counter frequency string in the format expected by cpuinfo.
// ex: `4000.000`
const auto FrequencyString = fextl::fmt::format("{:.3f}", Frequency);
for (int i = 0; i < CPUCores; ++i) {
cpu_stream << "processor\t: " << i << std::endl; // Logical id
cpu_stream << "vendor_id\t: " << vendorid.Str << std::endl;
@ -392,7 +402,7 @@ fextl::string GenerateCPUInfo(FEXCore::Context::Context* ctx, uint32_t CPUCores)
cpu_stream << "model name\t: " << modelname.Str << std::endl;
cpu_stream << "stepping\t: " << info.Stepping << std::endl;
cpu_stream << "microcode\t: 0x0" << std::endl;
cpu_stream << "cpu MHz\t\t: 3000" << std::endl;
cpu_stream << "cpu MHz\t\t: " << FrequencyString << std::endl;
cpu_stream << "cache size\t: 512 KB" << std::endl;
cpu_stream << "physical id\t: 0" << std::endl; // Socket id (always 0 for a single socket system)
cpu_stream << "siblings\t: " << CPUCores << std::endl; // Number of logical cores