GICM_TYPER, Distributor MSI Type Register

The GICM_TYPER characteristics are:

Purpose

Provides information about what features the GIC implementation supports.

Configuration

This register is available in all configurations of the GIC. When GICD_CTLR.DS==0, this register is Common.

Attributes

GICM_TYPER is a 32-bit register.

Field descriptions

313029282726252423222120191817161514131211109876543210
ValidCLRSRINTIDRES0NumSPIs

Valid, bit [31]

Reports whether GICM_TYPER content is valid.

ValidMeaning
0b0

GICM_TYPER reports no information on the capabilities of the GICM frame, all other fields are RES0.

0b1

GICM_TYPER reports information on capabilities of GICM frame.

CLR, bit [30]

Reports whether MSI clear registers are supported.

CLRMeaning
0b0

MSI clear registers not implemented.

0b1

MSI clear registers implemented.

SR, bit [29]

Reports whether Secure aliases of MSI registers are supported.

SRMeaning
0b0

Secure aliases of MSI registers not implemented.

0b1

Secure aliases of MSI registers implemented.

INTID, bits [28:16]

INTID of the first SPI assigned to this GICM frame.

Bits [15:11]

Reserved, RES0.

NumSPIs, bits [10:0]

Number of SPIs assigned to this GICM frame.

Accessing GICM_TYPER

GICM_TYPER can be accessed through the memory-mapped interfaces:

ComponentFrameOffsetInstance
GIC DistributorMSI_base0x0004GICM_TYPER

Accesses on this interface are RO.


04/07/2023 11:24; 1b994cb0b8c6d1ae5a9a15edbc8bd6ce3b5c7d68

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