GITS_STATUSR ITS Error Reporting Status Register GIC ITS control 0x0040 GITS_STATUSR RW Provides software with a mechanism to detect: Accesses to reserved locations. Writes to read-only locations. Reads of write-only locations. Unmapped MSIs. GITS GITS_STATUSR is a 32-bit register. 31 10 31:10 Reserved, RES0. Syndrome 9 6 9:6 Syndrome for the MSI that set GITS_STATUSR.UMSI to 1. An implementation might not support reporting all syndromes, and might report 0b0000 for any cause. This field is UNKNOWN when GITS_STATUSR.UMSI is 0. 0b0000 Unknown reason. 0b0010 DeviceID out of range. 0b0011 DeviceID unmapped. 0b0100 EventID out of range. 0b0101 EventID unmapped. 0b0111 Collection unmapped. 0b1001 vPEID unmapped. Overflow 5 5 5 Reports whether an unmapped MSI has been received while GITS_STATUSR.UMSI is 1. A software write of 1 to the bit clears it. A write of any other value is ignored. If GITS_TYPER.UMSI is 0, this field is RES0. 0b0 No unmapped MSIs have been received since GITS_STATUSR.UMSI set to 1. 0b1 At least one unmapped MSIs have been received since GITS_STATUSR.UMSI set to 1. UMSI 4 4 4 Reports whether an unmapped MSI has been received An unmapped MSI is defined as an MSI arriving at GITS_TRANSLATER for which there is insufficient mapping information for it to be forwarded to a Redistributor. It is IMPLEMENTATION DEFINED whether an INT command can be reported as an unmapped MSI. A software write of 1 to the bit clears it. A write of any other value is ignored. If GITS_TYPER.UMSI is 0, this field is RES0. 0b0 No unmapped MSIs have been received. 0b1 Unmapped MSI received. WROD 3 3 3 Write to an RO location. When a violation is detected, software must write 1 to this register to reset it. 0b0 Normal operation. 0b1 A write to an RO location has been detected. RWOD 2 2 2 Read of a WO location. When a violation is detected, software must write 1 to this register to reset it. 0b0 Normal operation. 0b1 A read of a WO location has been detected. WRD 1 1 1 Write to a reserved location. When a violation is detected, software must write 1 to this register to reset it. 0b0 Normal operation. 0b1 A write to a reserved location has been detected. RRD 0 0 0 Read of a reserved location. When a violation is detected, software must write 1 to this register to reset it. 0b0 Normal operation. 0b1 A read of a reserved location has been detected. This is an optional register. If the register is not implemented, the location is RAZ/WI. 2026-03-26 20:27:25 2026-03_rel