GICV_IIDR, Virtual Machine CPU Interface Identification Register

The GICV_IIDR characteristics are:

Purpose

Provides information about the implementer and revision of the virtual CPU interface.

This register is part of the GIC virtual CPU interface registers functional group.

Usage constraints

This register is accessible as follows:

Security disabledSecureNon-secure
RORORO

Configuration

This register is available in all configurations of the GIC. If the GIC implementation supports two Security states this register is Common.

Attributes

GICV_IIDR is a 32-bit register.

Field descriptions

The GICV_IIDR bit assignments are:

313029282726252423222120191817161514131211109876543210
ProductIDArchitecture_versionRevisionImplementer

ProductID, bits [31:20]

An IMPLEMENTATION DEFINED product identifier.

Architecture_version, bits [19:16]

The version of the GIC architecture that is implemented.

Architecture_versionMeaning
0001

GICv1.

0010

GICv2.

0011

GICv3 memory-mapped interface supported. Support for the System register interface is discoverable from PE registers ID_PFR1 and ID_AA64PFR0_EL1.

0100

GICv4 memory-mapped interface supported. Support for the System register interface is discoverable from PE registers ID_PFR1 and ID_AA64PFR0_EL1.

Other values are reserved.

Revision, bits [15:12]

An IMPLEMENTATION DEFINED revision number for the CPU interface.

Implementer, bits [11:0]

Contains the JEP106 code of the company that implemented the CPU interface.

Accessing the GICV_IIDR

GICV_IIDR can be accessed through its memory-mapped interface:

ComponentOffset
GIC Virtual CPU interface 0x00FC



18/04/2017 17:00

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