Commit Graph

2 Commits

Author SHA1 Message Date
Andrei Warkentin
5ad2592ab3 UefiCpuPkg: CpuTimerDxeRiscV64: fix tick duration accounting
The TimerDxe implementation doesn't account for the physical
time passed due to timer handler execution or (perhaps even
more importantly) time spent with interrupts masked.

Other implementations (e.g. like the Arm one) do. If the
timer tick is always incremented at a fixed rate, then
you can slow down UEFI's perception of time by running
long sections of code in a critical section.

Cc: Daniel Schaefer <git@danielschaefer.me>
Reviewed-by: Sunil V L <sunilvl@ventanamicro.com>
Signed-off-by: Andrei Warkentin <andrei.warkentin@intel.com>
2023-03-08 18:10:34 +00:00
Sunil V L
98fa877efd UefiCpuPkg: Add CpuTimerDxeRiscV64 module
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=4076

This DXE module initializes the timer interrupt handler
and installs the Arch Timer protocol.

Cc: Eric Dong <eric.dong@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
Cc: Rahul Kumar <rahul1.kumar@intel.com>
Cc: Daniel Schaefer <git@danielschaefer.me>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Sunil V L <sunilvl@ventanamicro.com>
Acked-by: Abner Chang <abner.chang@amd.com>
Reviewed-by: Andrei Warkentin <andrei.warkentin@intel.com>
Acked-by: Ray Ni <ray.ni@Intel.com>
2023-02-16 05:53:28 +00:00