Augustin Cavalier bb2808d615 bootloader: Implement TSC calibration via hypervisor CPUID leaf. ... While debugging some problems on the HaikuPorts build VMs, mmlr noticed their clocks had an alarming amount of drift. This prompted an investigation into TSC calibration mechanisms, and the discovery that there is a VM-specific one which we did not implement. This mechanism is more accurate than counting cycles on VMs where cycles can be "stolen" (the probable cause of the aforementioned clock drift.) Tested in VMware (works out of the box) and on QEMU/KVM (may need TSC frequency specified or a host with invariant TSC.) Change-Id: I4ccfdb2e4e2621404ec9026e7106c02bf96faf18 Reviewed-on: https://review.haiku-os.org/c/haiku/+/7063 Reviewed-by: waddlesplash <waddlesplash@gmail.com>		2023-10-25 00:53:55 +00:00
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arch_cpu.h	bootloader: Implement TSC calibration via hypervisor CPUID leaf.	2023-10-25 00:53:55 +00:00
arch_hpet.h