Ryan Houdek fd4f6b8020 FEXCore: Dynamically scale TSC ...

When I implemented TSC scaling originally, I chose a scale factor of 128
because it basically covered the range of devices we cared about without
going too high. I also only tested devices that had a TSC scale factor
from 19.2Mhz to 34Mhz. Turns out there is hardware that also has a 48Mhz
cycle counter, which cause them to effectively have a 6.1Ghz cycle
counter, which is kind of absurd.

Instead of a fixed scale, just calculate the amount of scaling we need
to get >= the minimum threshold of 1Ghz. This will change the shift from
7 to 5 or 6 for the faster cycle counter devices.

Of course if someone wants to know the scale factor they can still use
cpuid function 15h to know it.

Fixes #4026

2024-09-03 13:41:31 -07:00

..

Context.cpp

FEXCore: Pass HostFeatures in to CreateNewContext directly

2024-08-08 21:02:41 -07:00

Context.h

FEXCore: Dynamically scale TSC

2024-09-03 13:41:31 -07:00