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| author | Andre Przywara <andre.przywara@arm.com> | 2022-11-17 16:42:09 +0000 |
|---|---|---|
| committer | Andre Przywara <andre.przywara@arm.com> | 2023-03-22 13:33:22 +0000 |
| commit | 603a0c6faef4194bd58fd2104971e4100648ed1c (patch) | |
| tree | ac38eac04820a0536508f35f615f68ff2ad92f71 /docs/getting_started | |
| parent | d7f3ed3655b85223583d8c2d9e719f364266ef26 (diff) | |
| download | arm-trusted-firmware-603a0c6faef4194bd58fd2104971e4100648ed1c.tar.gz | |
refactor(cpufeat): enable SYS_REG_TRACE for FEAT_STATE_CHECKED
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>
Diffstat (limited to 'docs/getting_started')
| -rw-r--r-- | docs/getting_started/build-options.rst | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/docs/getting_started/build-options.rst b/docs/getting_started/build-options.rst index 9415871df..94c12defe 100644 --- a/docs/getting_started/build-options.rst +++ b/docs/getting_started/build-options.rst @@ -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), |