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GITS_UMSIR, ITS Unmapped MSI register
The GITS_UMSIR characteristics are:
Purpose
Provides the DeviceID and EventID of the unmapped MSI that set GITS_STATUSR.UMSI.
Configuration
This register is present only when GITS_TYPER.UMSI == 1. Otherwise, direct accesses to GITS_UMSIR are RES0.
Attributes
GITS_UMSIR is a 64-bit register.
Field descriptions
The GITS_UMSIR bit assignments are:
| 63 | 62 | 61 | 60 | 59 | 58 | 57 | 56 | 55 | 54 | 53 | 52 | 51 | 50 | 49 | 48 | 47 | 46 | 45 | 44 | 43 | 42 | 41 | 40 | 39 | 38 | 37 | 36 | 35 | 34 | 33 | 32 |
| DeviceID | |||||||||||||||||||||||||||||||
| EventID | |||||||||||||||||||||||||||||||
| 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
DeviceID, bits [63:32]
DeviceID of MSI that set GITS_STATUSR.UMSI to 1.
If GITS_STATUSR.UMSI is 0, this field is UNKNOWN.
EventID, bits [31:0]
EventID of MSI that set GITS_STATUSR.UMSI to 1.
If GITS_STATUSR.UMSI is 0, this field is UNKNOWN.
Accessing the GITS_UMSIR
GITS_UMSIR can be accessed through the memory-mapped interfaces:
| Component | Offset | Instance |
|---|---|---|
| GIC ITS control | 0x0028 | GITS_UMSIR |
This interface is accessible as follows:
- When GICD_CTLR.DS == 0 accesses to this register are RO.
- When an access is Secure accesses to this register are RW.
- When an access is Non-secure accesses to this register are RW.