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Kernel: Disable x86 RDTSC instruction in userspace
It's still possible to read the TSC via the read_tsc() syscall, but we will now clear some of the bottom bits for unprivileged users.
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6 changed files with 25 additions and 1 deletions
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@ -526,6 +526,7 @@ bool g_cpu_supports_pae;
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bool g_cpu_supports_pge;
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bool g_cpu_supports_smep;
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bool g_cpu_supports_sse;
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bool g_cpu_supports_tsc;
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bool g_cpu_supports_umip;
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void detect_cpu_features()
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@ -534,6 +535,7 @@ void detect_cpu_features()
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g_cpu_supports_pae = (processor_info.edx() & (1 << 6));
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g_cpu_supports_pge = (processor_info.edx() & (1 << 13));
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g_cpu_supports_sse = (processor_info.edx() & (1 << 25));
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g_cpu_supports_tsc = (processor_info.edx() & (1 << 4));
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CPUID extended_processor_info(0x80000001);
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g_cpu_supports_nx = (extended_processor_info.edx() & (1 << 20));
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