GITS_UMSIR ITS Unmapped MSI register when GITS_TYPER.UMSI == '1' GIC ITS control 0x0048 GITS_UMSIR RO Provides the DeviceID and EventID of the unmapped MSI that set GITS_STATUSR.UMSI. GITS GITS_UMSIR is a 64-bit register. DeviceID 63 32 63:32 DeviceID of MSI that set GITS_STATUSR.UMSI to 1. If GITS_STATUSR.UMSI is 0, this field is UNKNOWN. EventID 31 0 31:0 EventID of MSI that set GITS_STATUSR.UMSI to 1. If GITS_STATUSR.UMSI is 0, this field is UNKNOWN. 2026-03-26 20:27:25 2026-03_rel