tree b40c972d2a8c0a188db3528ccbe73f8e73fbe230
parent 97272946a72d8d4855693772a65cc8c05874fda3
author Andre Przywara <andre.przywara@arm.com> 1668706243 +0000
committer Andre Przywara <andre.przywara@arm.com> 1679492002 +0000

refactor(cpufeat): enable FEAT_ECV for FEAT_STATE_CHECKED

At the moment we only support FEAT_ECV to be either unconditionally
compiled in, or to be not supported at all.

Add support for runtime detection (ENABLE_FEAT_ECV=2), by splitting
is_feat_ecv_present() into an ID register reading function and a second
function to report the support status. That function considers both
build time settings and runtime information (if needed), and is used
before we access the CNTPOFF_EL2 system register.
Also move the context saving code from assembly to C, and use the new
is_feat_ecv_supported() function to guard its execution.

Change the FVP platform default to the now supported dynamic option (=2),
so the right decision can be made by the code at runtime.

Change-Id: I4acd5384929f1902b62a87ae073aafa1472cd66b
Signed-off-by: Andre Przywara <andre.przywara@arm.com>