Djam/arm-trusted-firmware
1
0
Fork 0
mirror of https://github.com/ARM-software/arm-trusted-firmware.git synced 2025-05-08 10:08:47 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

refactor(cpufeat): enable SYS_REG_TRACE for FEAT_STATE_CHECKED

Browse source 
At the moment we only support access to the trace unit by system
registers (SYS_REG_TRACE) to be either unconditionally compiled in, or
to be not supported at all.

Add support for runtime detection (ENABLE_SYS_REG_TRACE_FOR_NS=2), by
adding is_feat_sys_reg_trace_supported(). That function considers both
build time settings and runtime information (if needed), and is used
before we access SYS_REG_TRACE related registers.

The FVP platform decided to compile in support unconditionally (=1),
even though this is an optional feature, so it is not available with the
FVP model's default command line.
Change that to the now supported dynamic option (=2), so the right
decision can be made by the code at runtime.

Change-Id: I450a574a4f6bd9fc269887037049c94c906f54b2
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
This commit is contained in:
Andre Przywara 2022-11-17 16:42:09 +00:00
parent d7f3ed3655
commit 603a0c6fae
12 changed files with 80 additions and 51 deletions
Download patch file Download diff file Expand all files Collapse all files

5
docs/getting_started/build-options.rst
View file

@ -1079,10 +1079,11 @@ Common build options
``FEATURE_DETECTION`` mechanism. The default is 0 and it is automatically
disabled when the target architecture is AArch32.
- ``ENABLE_SYS_REG_TRACE_FOR_NS``: Boolean option to enable trace system
- ``ENABLE_SYS_REG_TRACE_FOR_NS``: Numeric value to enable trace system
registers access from NS ELs, NS-EL2 or NS-EL1 (when NS-EL2 is implemented
but unused). This feature is available if trace unit such as ETMv4.x, and
ETE(extending ETM feature) is implemented. This flag is disabled by default.
ETE(extending ETM feature) is implemented. This flag can take the values
0 to 2, to align with the ``FEATURE_DETECTION`` mechanism. The default is 0.
- ``ENABLE_TRF_FOR_NS``: Numeric value to enable trace filter control registers
access from NS ELs, NS-EL2 or NS-EL1 (when NS-EL2 is implemented but unused),