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GIC-v3: optional asymetric / legacy support

Vincent Siles

Hi,

how can I check if the GIC-v3 I am using has support for the optional asymetric / legacy support ?

Best,

V.

Parents
  • 0

    Hi,

    From §10.1.2 of the GICv3 Architecture Reference Manual (ARM IHI0069C):

    Legacy operation is a deprecated feature. In an implementation that does not support legacy operation the following

    bits, where implemented, are RAO/WI:

        • ICC_SRE_EL1.SRE.

        • ICC_SRE_EL2.SRE.

        • ICC_SRE_EL3.SRE.

        • ICC_SRE.SRE.

        • ICC_HSRE.SRE.

        • ICC_MSRE.SRE.

        • GICD_CTLR.ARE_NS.

        • GICD_CTLR.ARE_S.

    A consequence of this is that if a GICv3 implementation supports legacy operation, it will be in legacy mode at reset; so if you're not in legacy mode at reset, your GICv3 implementation does not support legacy operation.

    Hope that helps,

    Ash.

Reply
  • 0

    Hi,

    From §10.1.2 of the GICv3 Architecture Reference Manual (ARM IHI0069C):

    Legacy operation is a deprecated feature. In an implementation that does not support legacy operation the following

    bits, where implemented, are RAO/WI:

        • ICC_SRE_EL1.SRE.

        • ICC_SRE_EL2.SRE.

        • ICC_SRE_EL3.SRE.

        • ICC_SRE.SRE.

        • ICC_HSRE.SRE.

        • ICC_MSRE.SRE.

        • GICD_CTLR.ARE_NS.

        • GICD_CTLR.ARE_S.

    A consequence of this is that if a GICv3 implementation supports legacy operation, it will be in legacy mode at reset; so if you're not in legacy mode at reset, your GICv3 implementation does not support legacy operation.

    Hope that helps,

    Ash.

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