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GITS_MPAMIDR, Report maximum PARTID and PMG Register

The GITS_MPAMIDR characteristics are:


Reports the maximum support PARTID and PMG values.


This register is present only when FEAT_GICv3p1 is implemented. Otherwise, direct accesses to GITS_MPAMIDR are RES0.

A copy of this register is provided for each ITS.

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


GITS_MPAMIDR is a 32-bit register.

Field descriptions

The GITS_MPAMIDR bit assignments are:


Bits [31:24]

Reserved, RES0.

PMGmax, bits [23:16]

Maximum PMG value supported.

PARTIDmax, bits [15:0]

Maximum PARTID value supported.

Accessing the GITS_MPAMIDR

GITS_MPAMIDR can be accessed through the memory-mapped interfaces:

GIC ITS control0x0010

This interface is accessible as follows:

  • When GICD_CTLR.DS == 0 accesses to this register are RO.
  • When an access is Secure accesses to this register are RO.
  • When an access is Non-secure accesses to this register are RO.