Architecture Features
=====================

The Arm architecture evolves through versioning, with new architectural features being introduced
almost every year listed in `Feature_description`_. While most of these features require no control at EL3, some demand explicit
configuration of EL3 control registers to enable their use at lower Exception Levels. For features
with EL3 controls, it is relatively straightforward to examine the code and determine whether TF-A
supports them. However, for features that are transparent to EL3, it is more challenging to confirm
whether they have been analyzed and verified as not requiring changes in TF-A.

This document serves as a central reference point to track and clarify the support status of
architectural features within TF-A.

This document organizes features according to the yearly updates, while the specific architecture
versions (8.X, 9.X) to which they apply can be found in `Feature_description`_

.. note::

   **Status legend** —

   * ``OK``: TF-A has explicit support;
   * ``NA``: Transparent from EL3 (no EL3 changes required);
   * ``NO``: Analyzed but decided not to implement;
   * ``WIP``: Implementation in progress;
   * *(empty)*: Not analyzed.

2025 Extensions
---------------

+-------------------------+--------+
| Feature                 | Status |
+=========================+========+
| FEAT_GCIE               |        |
+-------------------------+--------+
| FEAT_GCIE_LEGACY        |        |
+-------------------------+--------+
| FEAT_F16F32DOT          |        |
+-------------------------+--------+
| FEAT_F16F32MM           |        |
+-------------------------+--------+
| FEAT_F16MM              |        |
+-------------------------+--------+
| FEAT_SVE_B16MM          |        |
+-------------------------+--------+
| FEAT_SME2p3             |        |
+-------------------------+--------+
| FEAT_MTE_EIRG           |  NA    |
+-------------------------+--------+
| FEAT_MTETC              |        |
+-------------------------+--------+
| FEAT_SVE2p3             |        |
+-------------------------+--------+
| FEAT_SCR2               |        |
+-------------------------+--------+
| FEAT_LSCP               |        |
+-------------------------+--------+
| FEAT_MPAMv2_VID         |        |
+-------------------------+--------+
| FEAT_MPAMv2_MSC         |        |
+-------------------------+--------+
| FEAT_MPAMv2_MSC_MON_SEC |        |
+-------------------------+--------+
| FEAT_MPAMv2_ALT_ID      |        |
+-------------------------+--------+
| FEAT_MPAMv2             |        |
+-------------------------+--------+
| FEAT_FDIT               |        |
+-------------------------+--------+
| FEAT_CMH                |        |
+-------------------------+--------+
| FEAT_EAESR              |        |
+-------------------------+--------+
| FEAT_TLBID              |        |
+-------------------------+--------+
| FEAT_SRMASK2            |        |
+-------------------------+--------+
| FEAT_BBML3              |        |
+-------------------------+--------+
| FEAT_NV3                |        |
+-------------------------+--------+
| FEAT_PAuth_EnhCtl       |        |
+-------------------------+--------+
| FEAT_LORRL              |        |
+-------------------------+--------+

2024 Extensions
---------------

+-----------------------+--------+
| Feature               | Status |
+=======================+========+
| FEAT_PMUv3_EXTPMN     |        |
+-----------------------+--------+
| FEAT_SPEv1p5          |        |
+-----------------------+--------+
| FEAT_SPE_EXC          |        |
+-----------------------+--------+
| FEAT_SPE_nVM          |        |
+-----------------------+--------+
| FEAT_TRBEv1p1         |        |
+-----------------------+--------+
| FEAT_TRBE_EXC         |        |
+-----------------------+--------+
| FEAT_SME_MOP4         |        |
+-----------------------+--------+
| FEAT_SME_TMOP         |        |
+-----------------------+--------+
| FEAT_PoPS             |        |
+-----------------------+--------+
| FEAT_SME2p2           |        |
+-----------------------+--------+
| FEAT_CMPBR            |        |
+-----------------------+--------+
| FEAT_SSVE_AES         |        |
+-----------------------+--------+
| FEAT_RME_GPC3         |  WIP   |
+-----------------------+--------+
| FEAT_RME_GDI          |  WIP   |
+-----------------------+--------+
| FEAT_SVE2p2           |        |
+-----------------------+--------+
| FEAT_SSVE_BitPerm     |        |
+-----------------------+--------+
| FEAT_SSVE_FEXPA       |        |
+-----------------------+--------+
| FEAT_SVE_AES2         |        |
+-----------------------+--------+
| FEAT_LSFE             |        |
+-----------------------+--------+
| FEAT_FPRCVT           |        |
+-----------------------+--------+
| FEAT_SVE_F16F32MM     |        |
+-----------------------+--------+
| FEAT_F8F16MM          |        |
+-----------------------+--------+
| FEAT_F8F32MM          |        |
+-----------------------+--------+
| FEAT_SVE_BFSCALE      |        |
+-----------------------+--------+
| FEAT_OCCMO            |        |
+-----------------------+--------+
| FEAT_LS64WB           |        |
+-----------------------+--------+
| FEAT_AMU_EXTACR       |        |
+-----------------------+--------+
| FEAT_MPAM_MSC_DOMAINS |        |
+-----------------------+--------+
| FEAT_MPAM_MSC_DCTRL   |        |
+-----------------------+--------+
| FEAT_MPAM_PE_BW_CTRL  |   OK   |
+-----------------------+--------+
| FEAT_PCDPHINT         |        |
+-----------------------+--------+
| FEAT_SRMASK           |        |
+-----------------------+--------+
| FEAT_IDTE3            |   WIP  |
+-----------------------+--------+
| FEAT_UINJ             |   WIP  |
+-----------------------+--------+
| FEAT_NV2p1            |        |
+-----------------------+--------+
| FEAT_LSUI             |        |
+-----------------------+--------+

2023 Extensions
---------------

+-------------------+--------+
| Feature           | Status |
+===================+========+
| FEAT_E2H0         |   NA   |
+-------------------+--------+
| FEAT_SME_LUTv2    |   NA   |
+-------------------+--------+
| FEAT_LUT          |   NA   |
+-------------------+--------+
| FEAT_FAMINMAX     |   NA   |
+-------------------+--------+
| FEAT_FPMR         |   OK   |
+-------------------+--------+
| FEAT_FP8          |   NA   |
+-------------------+--------+
| FEAT_FP8FMA       |   NA   |
+-------------------+--------+
| FEAT_SSVE_FP8FMA  |   NA   |
+-------------------+--------+
| FEAT_FP8DOT4      |   NA   |
+-------------------+--------+
| FEAT_SSVE_FP8DOT4 |   NA   |
+-------------------+--------+
| FEAT_FP8DOT2      |   NA   |
+-------------------+--------+
| FEAT_SSVE_FP8DOT2 |   NA   |
+-------------------+--------+
| FEAT_SME_F8F16    |   NA   |
+-------------------+--------+
| FEAT_SME_F8F32    |   NA   |
+-------------------+--------+
| FEAT_CPA          |   NA   |
+-------------------+--------+
| FEAT_CPA2         |   OK   |
+-------------------+--------+
| FEAT_STEP2        |        |
+-------------------+--------+
| FEAT_BWE2         |   NA   |
+-------------------+--------+
| FEAT_SPE_FPF      |   NA   |
+-------------------+--------+
| FEAT_SPE_EFT      |   NA   |
+-------------------+--------+
| FEAT_PMUv3_TH2    |   NA   |
+-------------------+--------+
| FEAT_SPMU2        |   NA   |
+-------------------+--------+
| FEAT_E3DSE        |        |
+-------------------+--------+
| FEAT_PMUv3_SME    |   NA   |
+-------------------+--------+
| FEAT_SPE_SME      |   NA   |
+-------------------+--------+
| FEAT_SPE_ALTCLK   |   NA   |
+-------------------+--------+
| FEAT_HDBSS        |        |
+-------------------+--------+
| FEAT_HACDBS       |        |
+-------------------+--------+
| FEAT_TLBIW        |   NA   |
+-------------------+--------+
| FEAT_ASID2        |   NA   |
+-------------------+--------+
| FEAT_RME_GPC2     |   WIP  |
+-------------------+--------+
| FEAT_FGWTE3       |   OK   |
+-------------------+--------+
| FEAT_PAuth_LR     |   OK   |
+-------------------+--------+
| FEAT_ETS3         |   NA   |
+-------------------+--------+

2022 Extensions
---------------

+--------------------------+--------+
| Feature                  | Status |
+==========================+========+
| FEAT_BWE                 |        |
+--------------------------+--------+
| FEAT_ADERR               |        |
+--------------------------+--------+
| FEAT_ANERR               |        |
+--------------------------+--------+
| FEAT_DoubleFault2        |        |
+--------------------------+--------+
| FEAT_PFAR                |   OK   |
+--------------------------+--------+
| FEAT_RASv2               |        |
+--------------------------+--------+
| FEAT_CSSC                |        |
+--------------------------+--------+
| FEAT_RPRFM               |        |
+--------------------------+--------+
| FEAT_PRFMSLC             |        |
+--------------------------+--------+
| FEAT_SPECRES2            |        |
+--------------------------+--------+
| FEAT_CLRBHB              |        |
+--------------------------+--------+
| FEAT_ECBHB               |   NA   |
+--------------------------+--------+
| FEAT_SME2p1              |        |
+--------------------------+--------+
| FEAT_SME_F16F16          |        |
+--------------------------+--------+
| FEAT_SVE_B16B16          |        |
+--------------------------+--------+
| FEAT_SME_B16B16          |        |
+--------------------------+--------+
| FEAT_FGT2                |   OK   |
+--------------------------+--------+
| FEAT_MTE4                |   NA   |
+--------------------------+--------+
| FEAT_MTE_CANONICAL_TAGS  |   NA   |
+--------------------------+--------+
| FEAT_MTE_NO_ADDRESS_TAGS |   NA   |
+--------------------------+--------+
| FEAT_MTE_TAGGED_FAR      |        |
+--------------------------+--------+
| FEAT_MTE_PERM            |   NA   |
+--------------------------+--------+
| FEAT_MTE_STORE_ONLY      |   NA   |
+--------------------------+--------+
| FEAT_ITE                 |        |
+--------------------------+--------+
| FEAT_TRBE_EXT            |        |
+--------------------------+--------+
| FEAT_TRBE_MPAM           |        |
+--------------------------+--------+
| FEAT_ETEv1p3             |        |
+--------------------------+--------+
| FEAT_GCS                 |   OK   |
+--------------------------+--------+
| FEAT_CHK                 |        |
+--------------------------+--------+
| FEAT_SPE_DPFZS           |        |
+--------------------------+--------+
| FEAT_SPE_CRR             |        |
+--------------------------+--------+
| FEAT_EBEP                |   WIP  |
+--------------------------+--------+
| FEAT_SEBEP               |   OK   |
+--------------------------+--------+
| FEAT_PMUv3_SS            |        |
+--------------------------+--------+
| FEAT_SPMU                |        |
+--------------------------+--------+
| FEAT_PMUv3_ICNTR         |        |
+--------------------------+--------+
| FEAT_PMUv3p9             |        |
+--------------------------+--------+
| FEAT_SVE2p1              |        |
+--------------------------+--------+
| FEAT_Debugv8p9           |   OK   |
+--------------------------+--------+
| FEAT_ABLE                |        |
+--------------------------+--------+
| FEAT_PCSRv8p9            |        |
+--------------------------+--------+
| FEAT_LRCPC3              |        |
+--------------------------+--------+
| FEAT_SPEv1p4             |        |
+--------------------------+--------+
| FEAT_SPE_FDS             |        |
+--------------------------+--------+
| FEAT_PMUv3_EDGE          |        |
+--------------------------+--------+
| FEAT_D128                |   OK   |
+--------------------------+--------+
| FEAT_AIE                 |   OK   |
+--------------------------+--------+
| FEAT_S1PIE               |   OK   |
+--------------------------+--------+
| FEAT_ATS1A               |        |
+--------------------------+--------+
| FEAT_S1POE               |   OK   |
+--------------------------+--------+
| FEAT_S2PIE               |   OK   |
+--------------------------+--------+
| FEAT_S2POE               |   OK   |
+--------------------------+--------+
| FEAT_SYSREG128           |   OK   |
+--------------------------+--------+
| FEAT_SYSINSTR128         |        |
+--------------------------+--------+
| FEAT_LSE128              |        |
+--------------------------+--------+
| FEAT_HAFT                |        |
+--------------------------+--------+
| FEAT_THE                 |   OK   |
+--------------------------+--------+
| FEAT_LVA3                |        |
+--------------------------+--------+
| FEAT_MTE_ASYNC           |        |
+--------------------------+--------+
| FEAT_EDHSR               |        |
+--------------------------+--------+
| FEAT_AMU_EXT64           |        |
+--------------------------+--------+


2021 Extensions
---------------

+------------------+--------+
| Feature          | Status |
+==================+========+
| FEAT_SME2        |   OK   |
+------------------+--------+
| FEAT_MEC         |   OK   |
+------------------+--------+
| FEAT_BRBEv1p1    |   WIP  |
+------------------+--------+
| FEAT_CMOW        |   NA   |
+------------------+--------+
| FEAT_Debugv8p8   |   NA   |
+------------------+--------+
| FEAT_HBC         |   NA   |
+------------------+--------+
| FEAT_MOPS        |   OK   |
+------------------+--------+
| FEAT_NMI         |   OK   |
+------------------+--------+
| FEAT_SPEv1p3     |   NA   |
+------------------+--------+
| FEAT_TIDCP1      |   NA   |
+------------------+--------+
| FEAT_PMUv3_TH    |   NA   |
+------------------+--------+
| FEAT_PMUv3p8     |   NA   |
+------------------+--------+
| FEAT_SCTLR2      |   OK   |
+------------------+--------+
| FEAT_TCR2        |   OK   |
+------------------+--------+
| FEAT_PMUv3_EXT64 |   NA   |
+------------------+--------+


2020 Extensions
---------------

+---------------------+--------+
| Feature             | Status |
+=====================+========+
| FEAT_EBF16          |   NA   |
+---------------------+--------+
| FEAT_ETEv1p1        |   NA   |
+---------------------+--------+
| FEAT_HCX            |   OK   |
+---------------------+--------+
| FEAT_PAN3           |   OK   |
+---------------------+--------+
| FEAT_WFxT           |   NA   |
+---------------------+--------+
| FEAT_XS             |   NO   |
+---------------------+--------+
| FEAT_AFP            |   NA   |
+---------------------+--------+
| FEAT_RPRES          |   NA   |
+---------------------+--------+
| FEAT_LPA2           |   NO   |
+---------------------+--------+
| FEAT_LS64           |   NA   |
+---------------------+--------+
| FEAT_LS64_V         |   NA   |
+---------------------+--------+
| FEAT_LS64_ACCDATA   |   OK   |
+---------------------+--------+
| FEAT_MTE3           |   NA   |
+---------------------+--------+
| FEAT_MTE_ASYM_FAULT |   NA   |
+---------------------+--------+
| FEAT_SPEv1p2        |   OK   |
+---------------------+--------+
| FEAT_SPE_FnE        |   NA   |
+---------------------+--------+
| FEAT_SPE_PBT        |   OK   |
+---------------------+--------+
| FEAT_PMUv3p7        |   OK   |
+---------------------+--------+

.. _Feature_description: https://developer.arm.com/documentation/109697/latest/