Intel® Core™ Ultra 200V Series Processors SOC I/O Registers
| ID | Date | Version | Classification |
|---|---|---|---|
| 831520 | 09/03/2024 | 001 | Public |
Invalidation Queue Head Register (IQH_REG_0_0_0_VTDBAR) – Offset 20080
Register indicating the invalidation queue head. This register is treated as Rsvd by implementations reporting Queued Invalidation (QI) as not supported in the Extended Capability register.
| Bit Range | Default | Access | Field Name and Description |
|---|---|---|---|
| 63:19 | 0h | RO | Reserved |
| 18:4 | 0h | RO/V | Queue Head (QH) Specifies the offset (128-bit or 256-bit aligned) to the invalidation queue for the command that will be fetched next by hardware When Descriptor Width (DW) field in Invalidation Queue Address Register (IQA_REG) is Set (256-bit descriptors), hardware treats bit-4 as reserved and will always write a value of 0 in the bit. Hardware resets this field to 0 whenever the queued invalidation is disabled (QIES field Clear in the Global Status register). |
| 3:0 | 0h | RO | Reserved |