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GICR_INVLPIR, Redistributor Invalidate LPI Register

The GICR_INVLPIR characteristics are:


Invalidates the cached configuration data of a specified LPI, causing the GIC to reload the interrupt configuration from the physical LPI Configuration table at the address specified by GICR_PROPBASER.


A copy of this register is provided for each Redistributor.


GICR_INVLPIR is a 64-bit register.

Field descriptions

The GICR_INVLPIR bit assignments are:


Bits [63:32]

Reserved, RES0.

pINTID, bits [31:0]

The INTID of the physical LPI to be cleaned.


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


If any LPI has been forwarded to the PE and a valid write to GICR_INVLPIR is received, the Redistributor must ensure it reloads its properties from memory and apply any changes by retrieving and reforwarding the LPI as required. This has no effect on the forwarded LPI if it has already been activated.

Accessing the GICR_INVLPIR

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 is IMPLEMENTATION DEFINED in an implementation that does include an ITS.

Writes to this register have no effect if either:

  • The specified LPI is not currently stored in the local Redistributor.
  • The pINTID field corresponds to an unimplemented LPI.

GICR_INVLPIR can be accessed through the memory-mapped interfaces:

GIC RedistributorRD_base0x00A0GICR_INVLPIR

This interface is accessible as follows:

  • When GICD_CTLR.DS == 0b0 accesses to this register are WO.
  • When IsAccessSecure() accesses to this register are WO.
  • When !IsAccessSecure() accesses to this register are WO.