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refactor(mte): remove mte, mte_perm

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Currently both FEAT_MTE and FEAT_MTE_PERM aren't used for enabling
of any feature bits in EL3. So remove both FEAT handling.

All mte regs that are currently context saved/restored are needed
only when FEAT_MTE2 is enabled, so move to usage of FEAT_MTE2 and
remove FEAT_MTE usage.

BREAKING CHANGE: Any platform or downstream code trying to use
SCR_EL3.ATA bit(26) will see failures as this is now moved to be
used only with FEAT_MTE2 with
commit@ef0d0e5478a3f19cbe70a378b9b184036db38fe2

Change-Id: Id01e154156571f7792135639e17dc5c8d0e17cf8
Signed-off-by: Govindraj Raja <govindraj.raja@arm.com>
This commit is contained in:
Govindraj Raja 2024-03-07 14:42:20 -06:00
parent e7419780f7
commit c282384dbb
14 changed files with 31 additions and 66 deletions
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12
docs/getting_started/build-options.rst
View file

@ -340,23 +340,11 @@ Common build options
flag can take the values 0 to 2, to align with the ``ENABLE_FEAT``
mechanism. Default value is ``0``.
- ``ENABLE_FEAT_MTE``: Numeric value to enable Memory Tagging Extension
if the platform wants to use this feature at EL0 ``ENABLE_FEAT_MTE`` is
required. This flag can take values 0 to 2, to align with the ``ENABLE_FEAT``
feature detection mechanism. Default value is ``0``.
- ``ENABLE_FEAT_MTE2``: Numeric value to enable Memory Tagging Extension2
if the platform wants to use this feature and MTE2 is enabled at ELX.
This flag can take values 0 to 2, to align with the ``ENABLE_FEAT``
mechanism. Default value is ``0``.
- ``ENABLE_FEAT_MTE_PERM``: Numeric value to enable support for
``FEAT_MTE_PERM``, which introduces Allocation tag access permission to
memory region attributes. ``FEAT_MTE_PERM`` is a optional architectural
feature available from v8.9 and upwards. This flag can take the values 0 to
2, to align with the ``ENABLE_FEAT`` mechanism. Default value is
``0``.
- ``ENABLE_FEAT_PAN``: Numeric value to enable the ``FEAT_PAN`` (Privileged
Access Never) extension. ``FEAT_PAN`` adds a bit to PSTATE, generating a
permission fault for any privileged data access from EL1/EL2 to virtual