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| -rw-r--r-- | docs/getting_started/build-internals.rst | 21 |
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diff --git a/docs/getting_started/build-internals.rst b/docs/getting_started/build-internals.rst new file mode 100644 index 0000000..390c367 --- /dev/null +++ b/docs/getting_started/build-internals.rst @@ -0,0 +1,21 @@ +Internal Build Options +====================== + +|TF-A| internally uses certain options that are not exposed directly through +:ref:`build-options <build options>` but enabled or disabled indirectly and +depends on certain options to be enabled or disabled. + +.. _build_options_internal: + +- ``CTX_INCLUDE_EL2_REGS``: This boolean option provides context save/restore + operations when entering/exiting an EL2 execution context. This is of primary + interest when Armv8.4-SecEL2 or RME extension is implemented. + Default is 0 (disabled). This option will be set to 1 (enabled) when ``SPD=spmd`` + and ``SPMD_SPM_AT_SEL2`` is set or when ``ENABLE_RME`` is set to 1 (enabled). + +- ``FFH_SUPPORT``: This boolean option provides support to enable Firmware First + handling (FFH) of External aborts and SError interrupts originating from lower + ELs which gets trapped in EL3. This option will be set to 1 (enabled) if + ``HANDLE_EA_EL3_FIRST_NS`` is set. Currently only NS world routes EA to EL3 but + in future when Secure/Realm wants to use FFH then they can introduce new macros + which will enable this option implicitly. |