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We can skip the PIT-based TSC calibration if we can derive the invariant TSC rate from CPUID/MSR data. This is necessary if the PIT is disabled, which is the default, for instance, on Coffee Lake CPUs. This implementation should cover all Intel Core i processors at least. For older processors, we fall back to the PIT calibration. Change-Id: Ic6607ee2a8b41c2be9dc1bb4f1e23e652bb33889 Signed-off-by: Nico Huber <nico.huber@secunet.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/34170 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Angel Pons <th3fanbus@gmail.com> Reviewed-by: Michael Niewöhner <foss@mniewoehner.de> |
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