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GICR_MPAMIDR

GICR_MPAMIDR, Report maximum PARTID and PMG Register

The GICR_MPAMIDR characteristics are:

Purpose

Reports the maximum support PARTID and PMG values.

Configuration

This register is present only when GICv3.1 is implemented. Otherwise, direct accesses to GICR_MPAMIDR are RES0.

A copy of this register is provided for each Redistributor.

When GICR_TYPER.MPAM==0, this register is RES0.

Attributes

GICR_MPAMIDR is a 32-bit register.

Field descriptions

31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
RES0								PMGmax								PARTIDmax

Bits [31:24]

Reserved, RES0.

PMGmax, bits [23:16]

Maximum PMG value supported.

This field has an IMPLEMENTATION DEFINED value.

Access to this field is RO.

PARTIDmax, bits [15:0]

Maximum PARTID value supported.

This field has an IMPLEMENTATION DEFINED value.

Access to this field is RO.

Accessing GICR_MPAMIDR

GICR_MPAMIDR can be accessed through the memory-mapped interfaces:

Component	Frame	Offset	Instance
GIC Redistributor	RD_base	0x0018	GICR_MPAMIDR

Accesses to this register are RO.

2026-03-12 12:23:09, 2025-09_rel_asl1