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authorNico Huber <nico.huber@secunet.com>2019-07-03 15:48:54 +0200
committerPatrick Georgi <pgeorgi@google.com>2020-11-02 06:24:33 +0000
commitbc2c12c72834a5b24fadd13d24df93298199dda1 (patch)
tree8e2f928012a4ca3c004015746b8636aaa3424d7f /src/acpi
parent5c9d82bd7337a73f67c7ca83d0d7489e636d1b7b (diff)
libpayload/x86: Try to discover invariant TSC rate
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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