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GICR_CLRLPIR, Clear LPI Pending Register

The GICR_CLRLPIR characteristics are:


Clears the pending state of the specified LPI.


This register is present only when FEAT_GICv4p1 is implemented. Otherwise, direct accesses to GICR_CLRLPIR are RES0.

A copy of this register is provided for each Redistributor.


GICR_CLRLPIR is a 64-bit register.

Field descriptions

The GICR_CLRLPIR bit assignments are:


Bits [63:32]

Reserved, RES0.

pINTID, bits [31:0]

The INTID of the physical LPI.


The size of this field is IMPLEMENTATION DEFINED, and is specified by the GICD_TYPER.IDbits field. Unimplemented bits are RES0.

Accessing the GICR_CLRLPIR

When written with a 32-bit write the data is zero-extended to 64 bits.

This register is mandatory in an implementation that supports LPIs and does not include an ITS. The functionality of this register is IMPLEMENTATION DEFINED in an implementation that does include an ITS.

Writes to this register have no effect if any of the following apply:

  • GICR_CTLR.EnableLPIs == 0.
  • The pINTID value specifies an unimplemented LPI.
  • The pINTID value specifies an LPI that is not pending.

GICR_CLRLPIR can be accessed through the memory-mapped interfaces:

GIC RedistributorRD_base0x0048GICR_CLRLPIR

This interface is accessible as follows:

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