# SPDX-License-Identifier: (GPL-2.0 OR MIT)
%YAML 1.2
---
$id: http://devicetree.org/schemas/riscv/extensions.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: RISC-V ISA extensions

maintainers:
  - Paul Walmsley <paul.walmsley@sifive.com>
  - Palmer Dabbelt <palmer@sifive.com>
  - Conor Dooley <conor@kernel.org>

description: |
  RISC-V has a large number of extensions, some of which are "standard"
  extensions, meaning they are ratified by RISC-V International, and others
  are "vendor" extensions.
  This document defines properties that indicate whether a hart supports a
  given extension.
 
  Once a standard extension has been ratified, no changes in behaviour can be
  made without the creation of a new extension.
  The properties for standard extensions therefore map to their originally
  ratified states, with the exception of the I, Zicntr & Zihpm extensions.
  See the "i" property for more information.

select:
  properties:
    compatible:
      contains:
        const: riscv

properties:
  riscv,isa:
    description:
      Identifies the specific RISC-V instruction set architecture
      supported by the hart.  These are documented in the RISC-V
      User-Level ISA document, available from
      https://riscv.org/specifications/
 
      Due to revisions of the ISA specification, some deviations
      have arisen over time.
      Notably, riscv,isa was defined prior to the creation of the
      Zicntr, Zicsr, Zifencei and Zihpm extensions and thus "i"
      implies "zicntr_zicsr_zifencei_zihpm".
 
      While the isa strings in ISA specification are case
      insensitive, letters in the riscv,isa string must be all
      lowercase.
    $ref: /schemas/types.yaml#/definitions/string
    pattern: ^rv(?:64|32)imaf?d?q?c?b?k?j?p?v?h?(?:[hsxz](?:[0-9a-z])+)?(?:_[hsxz](?:[0-9a-z])+)*$
    deprecated: true

  riscv,isa-base:
    description:
      The base ISA implemented by this hart, as described by the 20191213
      version of the unprivileged ISA specification.
    enum:
      - rv32i
      - rv64i

  riscv,isa-extensions:
    $ref: /schemas/types.yaml#/definitions/string-array
    minItems: 1
    description: Extensions supported by the hart.
    items:
      anyOf:
        # single letter extensions, in canonical order
        - const: i
          description: |
            The base integer instruction set, as ratified in the 20191213
            version of the unprivileged ISA specification.
 
            This does not include Chapter 10, "Counters", which was moved into
            the Zicntr and Zihpm extensions after the ratification of the
            20191213 version of the unprivileged specification.

        - const: m
          description:
            The standard M extension for integer multiplication and division, as
            ratified in the 20191213 version of the unprivileged ISA
            specification.

        - const: a
          description:
            The standard A extension for atomic instructions, as ratified in the
            20191213 version of the unprivileged ISA specification.

        - const: f
          description:
            The standard F extension for single-precision floating point, as
            ratified in the 20191213 version of the unprivileged ISA
            specification.

        - const: d
          description:
            The standard D extension for double-precision floating-point, as
            ratified in the 20191213 version of the unprivileged ISA
            specification.

        - const: q
          description:
            The standard Q extension for quad-precision floating-point, as
            ratified in the 20191213 version of the unprivileged ISA
            specification.

        - const: c
          description:
            The standard C extension for compressed instructions, as ratified in
            the 20191213 version of the unprivileged ISA specification.

        - const: v
          description:
            The standard V extension for vector operations, as ratified
            in-and-around commit 7a6c8ae ("Fix text that describes vfmv.v.f
            encoding") of the riscv-v-spec.

        - const: h
          description:
            The standard H extension for hypervisors as ratified in the 20191213
            version of the privileged ISA specification.
 
        # multi-letter extensions, sorted alphanumerically
        - const: smaia
          description: |
            The standard Smaia supervisor-level extension for the advanced
            interrupt architecture for machine-mode-visible csr and behavioural
            changes to interrupts as frozen at commit ccbddab ("Merge pull
            request #42 from riscv/jhauser-2023-RC4") of riscv-aia.

        - const: smstateen
          description: |
            The standard Smstateen extension for controlling access to CSRs
            added by other RISC-V extensions in H/S/VS/U/VU modes and as
            ratified at commit a28bfae (Ratified (#7)) of riscv-state-enable.

        - const: ssaia
          description: |
            The standard Ssaia supervisor-level extension for the advanced
            interrupt architecture for supervisor-mode-visible csr and
            behavioural changes to interrupts as frozen at commit ccbddab
            ("Merge pull request #42 from riscv/jhauser-2023-RC4") of riscv-aia.

        - const: sscofpmf
          description: |
            The standard Sscofpmf supervisor-level extension for count overflow
            and mode-based filtering as ratified at commit 01d1df0 ("Add ability
            to manually trigger workflow. (#2)") of riscv-count-overflow.

        - const: sstc
          description: |
            The standard Sstc supervisor-level extension for time compare as
            ratified at commit 3f9ed34 ("Add ability to manually trigger
            workflow. (#2)") of riscv-time-compare.

        - const: svinval
          description:
            The standard Svinval supervisor-level extension for fine-grained
            address-translation cache invalidation as ratified in the 20191213
            version of the privileged ISA specification.

        - const: svnapot
          description:
            The standard Svnapot supervisor-level extensions for napot
            translation contiguity as ratified in the 20191213 version of the
            privileged ISA specification.

        - const: svpbmt
          description:
            The standard Svpbmt supervisor-level extensions for page-based
            memory types as ratified in the 20191213 version of the privileged
            ISA specification.

        - const: zacas
          description: |
            The Zacas extension for Atomic Compare-and-Swap (CAS) instructions
            is supported as ratified at commit 5059e0ca641c ("update to
            ratified") of the riscv-zacas.

        - const: zba
          description: |
            The standard Zba bit-manipulation extension for address generation
            acceleration instructions as ratified at commit 6d33919 ("Merge pull
            request #158 from hirooih/clmul-fix-loop-end-condition") of
            riscv-bitmanip.

        - const: zbb
          description: |
            The standard Zbb bit-manipulation extension for basic bit-manipulation
            as ratified at commit 6d33919 ("Merge pull request #158 from
            hirooih/clmul-fix-loop-end-condition") of riscv-bitmanip.

        - const: zbc
          description: |
            The standard Zbc bit-manipulation extension for carry-less
            multiplication as ratified at commit 6d33919 ("Merge pull request
            #158 from hirooih/clmul-fix-loop-end-condition") of riscv-bitmanip.

        - const: zbkb
          description:
            The standard Zbkb bitmanip instructions for cryptography as ratified
            in version 1.0 of RISC-V Cryptography Extensions Volume I
            specification.

        - const: zbkc
          description:
            The standard Zbkc carry-less multiply instructions as ratified
            in version 1.0 of RISC-V Cryptography Extensions Volume I
            specification.

        - const: zbkx
          description:
            The standard Zbkx crossbar permutation instructions as ratified
            in version 1.0 of RISC-V Cryptography Extensions Volume I
            specification.

        - const: zbs
          description: |
            The standard Zbs bit-manipulation extension for single-bit
            instructions as ratified at commit 6d33919 ("Merge pull request #158
            from hirooih/clmul-fix-loop-end-condition") of riscv-bitmanip.

        - const: zfa
          description:
            The standard Zfa extension for additional floating point
            instructions, as ratified in commit 056b6ff ("Zfa is ratified") of
            riscv-isa-manual.

        - const: zfh
          description:
            The standard Zfh extension for 16-bit half-precision binary
            floating-point instructions, as ratified in commit 64074bc ("Update
            version numbers for Zfh/Zfinx") of riscv-isa-manual.

        - const: zfhmin
          description:
            The standard Zfhmin extension which provides minimal support for
            16-bit half-precision binary floating-point instructions, as ratified
            in commit 64074bc ("Update version numbers for Zfh/Zfinx") of
            riscv-isa-manual.

        - const: zk
          description:
            The standard Zk Standard Scalar cryptography extension as ratified
            in version 1.0 of RISC-V Cryptography Extensions Volume I
            specification.

        - const: zkn
          description:
            The standard Zkn NIST algorithm suite extensions as ratified in
            version 1.0 of RISC-V Cryptography Extensions Volume I
            specification.

        - const: zknd
          description: |
            The standard Zknd for NIST suite: AES decryption instructions as
            ratified in version 1.0 of RISC-V Cryptography Extensions Volume I
            specification.

        - const: zkne
          description: |
            The standard Zkne for NIST suite: AES encryption instructions as
            ratified in version 1.0 of RISC-V Cryptography Extensions Volume I
            specification.

        - const: zknh
          description: |
            The standard Zknh for NIST suite: hash function instructions as
            ratified in version 1.0 of RISC-V Cryptography Extensions Volume I
            specification.

        - const: zkr
          description:
            The standard Zkr entropy source extension as ratified in version
            1.0 of RISC-V Cryptography Extensions Volume I specification.
            This string being present means that the CSR associated to this
            extension is accessible at the privilege level to which that
            device-tree has been provided.

        - const: zks
          description:
            The standard Zks ShangMi algorithm suite extensions as ratified in
            version 1.0 of RISC-V Cryptography Extensions Volume I
            specification.

        - const: zksed
          description: |
            The standard Zksed for ShangMi suite: SM4 block cipher instructions
            as ratified in version 1.0 of RISC-V Cryptography Extensions
            Volume I specification.

        - const: zksh
          description: |
            The standard Zksh for ShangMi suite: SM3 hash function instructions
            as ratified in version 1.0 of RISC-V Cryptography Extensions
            Volume I specification.

        - const: zkt
          description:
            The standard Zkt for data independent execution latency as ratified
            in version 1.0 of RISC-V Cryptography Extensions Volume I
            specification.

        - const: zicbom
          description:
            The standard Zicbom extension for base cache management operations as
            ratified in commit 3dd606f ("Create cmobase-v1.0.pdf") of riscv-CMOs.

        - const: zicbop
          description:
            The standard Zicbop extension for cache-block prefetch instructions
            as ratified in commit 3dd606f ("Create cmobase-v1.0.pdf") of
            riscv-CMOs.

        - const: zicboz
          description:
            The standard Zicboz extension for cache-block zeroing as ratified
            in commit 3dd606f ("Create cmobase-v1.0.pdf") of riscv-CMOs.

        - const: zicntr
          description:
            The standard Zicntr extension for base counters and timers, as
            ratified in the 20191213 version of the unprivileged ISA
            specification.

        - const: zicond
          description:
            The standard Zicond extension for conditional arithmetic and
            conditional-select/move operations as ratified in commit 95cf1f9
            ("Add changes requested by Ved during signoff") of riscv-zicond.

        - const: zicsr
          description: |
            The standard Zicsr extension for control and status register
            instructions, as ratified in the 20191213 version of the
            unprivileged ISA specification.
 
            This does not include Chapter 10, "Counters", which documents
            special case read-only CSRs, that were moved into the Zicntr and
            Zihpm extensions after the ratification of the 20191213 version of
            the unprivileged specification.

        - const: zifencei
          description:
            The standard Zifencei extension for instruction-fetch fence, as
            ratified in the 20191213 version of the unprivileged ISA
            specification.

        - const: zihintpause
          description:
            The standard Zihintpause extension for pause hints, as ratified in
            commit d8ab5c7 ("Zihintpause is ratified") of the riscv-isa-manual.

        - const: zihintntl
          description:
            The standard Zihintntl extension for non-temporal locality hints, as
            ratified in commit 0dc91f5 ("Zihintntl is ratified") of the
            riscv-isa-manual.

        - const: zihpm
          description:
            The standard Zihpm extension for hardware performance counters, as
            ratified in the 20191213 version of the unprivileged ISA
            specification.

        - const: ztso
          description:
            The standard Ztso extension for total store ordering, as ratified
            in commit 2e5236 ("Ztso is now ratified.") of the
            riscv-isa-manual.

        - const: zvbb
          description:
            The standard Zvbb extension for vectored basic bit-manipulation
            instructions, as ratified in commit 56ed795 ("Update
            riscv-crypto-spec-vector.adoc") of riscv-crypto.

        - const: zvbc
          description:
            The standard Zvbc extension for vectored carryless multiplication
            instructions, as ratified in commit 56ed795 ("Update
            riscv-crypto-spec-vector.adoc") of riscv-crypto.

        - const: zvfh
          description:
            The standard Zvfh extension for vectored half-precision
            floating-point instructions, as ratified in commit e2ccd05
            ("Remove draft warnings from Zvfh[min]") of riscv-v-spec.

        - const: zvfhmin
          description:
            The standard Zvfhmin extension for vectored minimal half-precision
            floating-point instructions, as ratified in commit e2ccd05
            ("Remove draft warnings from Zvfh[min]") of riscv-v-spec.

        - const: zvkb
          description:
            The standard Zvkb extension for vector cryptography bit-manipulation
            instructions, as ratified in commit 56ed795 ("Update
            riscv-crypto-spec-vector.adoc") of riscv-crypto.

        - const: zvkg
          description:
            The standard Zvkg extension for vector GCM/GMAC instructions, as
            ratified in commit 56ed795 ("Update riscv-crypto-spec-vector.adoc")
            of riscv-crypto.

        - const: zvkn
          description:
            The standard Zvkn extension for NIST algorithm suite instructions, as
            ratified in commit 56ed795 ("Update riscv-crypto-spec-vector.adoc")
            of riscv-crypto.

        - const: zvknc
          description:
            The standard Zvknc extension for NIST algorithm suite with carryless
            multiply instructions, as ratified in commit 56ed795 ("Update
            riscv-crypto-spec-vector.adoc") of riscv-crypto.

        - const: zvkned
          description:
            The standard Zvkned extension for Vector AES block cipher
            instructions, as ratified in commit 56ed795 ("Update
            riscv-crypto-spec-vector.adoc") of riscv-crypto.

        - const: zvkng
          description:
            The standard Zvkng extension for NIST algorithm suite with GCM
            instructions, as ratified in commit 56ed795 ("Update
            riscv-crypto-spec-vector.adoc") of riscv-crypto.

        - const: zvknha
          description: |
            The standard Zvknha extension for NIST suite: vector SHA-2 secure,
            hash (SHA-256 only) instructions, as ratified in commit
            56ed795 ("Update riscv-crypto-spec-vector.adoc") of riscv-crypto.

        - const: zvknhb
          description: |
            The standard Zvknhb extension for NIST suite: vector SHA-2 secure,
            hash (SHA-256 and SHA-512) instructions, as ratified in commit
            56ed795 ("Update riscv-crypto-spec-vector.adoc") of riscv-crypto.

        - const: zvks
          description:
            The standard Zvks extension for ShangMi algorithm suite
            instructions, as ratified in commit 56ed795 ("Update
            riscv-crypto-spec-vector.adoc") of riscv-crypto.

        - const: zvksc
          description:
            The standard Zvksc extension for ShangMi algorithm suite with
            carryless multiplication instructions, as ratified in commit 56ed795
            ("Update riscv-crypto-spec-vector.adoc") of riscv-crypto.

        - const: zvksed
          description: |
            The standard Zvksed extension for ShangMi suite: SM4 block cipher
            instructions, as ratified in commit 56ed795 ("Update
            riscv-crypto-spec-vector.adoc") of riscv-crypto.

        - const: zvksh
          description: |
            The standard Zvksh extension for ShangMi suite: SM3 secure hash
            instructions, as ratified in commit 56ed795 ("Update
            riscv-crypto-spec-vector.adoc") of riscv-crypto.

        - const: zvksg
          description:
            The standard Zvksg extension for ShangMi algorithm suite with GCM
            instructions, as ratified in commit 56ed795 ("Update
            riscv-crypto-spec-vector.adoc") of riscv-crypto.

        - const: zvkt
          description:
            The standard Zvkt extension for vector data-independent execution
            latency, as ratified in commit 56ed795 ("Update
            riscv-crypto-spec-vector.adoc") of riscv-crypto.

additionalProperties: true
...