Commit feb5dba3 authored by Guodong Xu's avatar Guodong Xu Committed by Conor Dooley
Browse files

dt-bindings: riscv: Add Supm extension description 



Add description for the Supm extension. Supm indicates support for pointer
masking in user mode. Supm is mandatory for RVA23S64.

Add dependency check that Supm requires either Smnpm or Ssnpm.

The Supm extension is ratified in commit d70011dde6c2 ("Update to ratified
state") of riscv-j-extension.

Signed-off-by: default avatarGuodong Xu <guodong@riscstar.com>
Acked-by: default avatarConor Dooley <conor.dooley@microchip.com>
Signed-off-by: default avatarConor Dooley <conor.dooley@microchip.com>
parent 0aa19240

Documentation/devicetree/bindings/riscv/extensions.yaml

+27 −0
Original line number Diff line number Diff line
@@ -262,6 +262,23 @@ properties: 
            ratified in RISC-V Profiles Version 1.0, with commit b1d806605f87

            ("Updated to ratified state.")



        - const: supm

          description: |

            The standard Supm extension for pointer masking support in user

            mode (U-mode) as ratified at commit d70011dde6c2 ("Update to

            ratified state") of riscv-j-extension.



            Supm represents a combination of underlying hardware capability

            (Smnpm or Ssnpm), U-mode consumer privilege level, and M/S-mode

            software configuration that enables pointer masking for U-mode.



            DO NOT include this property in device trees targeting privileged

            system software (S-mode or M-mode).



            This property is only appropriate in device trees provided to

            U-mode software where the next-higher-privilege-mode supports

            Smnpm or Ssnpm and enables it for U-mode.



        - const: svade

          description: |

            The standard Svade supervisor-level extension for SW-managed PTE A/D
@@ -907,6 +924,16 @@ properties: 
        then:

          contains:

            const: b

      # Supm depends on Smnpm or Ssnpm

      - if:

          contains:

            const: supm

        then:

          oneOf:

            - contains:

                const: smnpm

            - contains:

                const: ssnpm

      # Za64rs and Ziccrse depend on Zalrsc or A

      - if:

          contains: