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GICR_CLRLPIR, Clear LPI Pending Register

The GICR_CLRLPIR characteristics are:


Clears the pending state of the specified LPI.


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 == 0b0 access to this register is WO.
  • When IsAccessSecure() access to this register is WO.
  • When !IsAccessSecure() access to this register is WO.