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The GITS_TYPER characteristics are:
Specifies the features that an ITS supports.
GITS_TYPER is a 64-bit register.
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 |
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 |
RES0 | INV | UMSIirq | UMSI | nID | SVPET | VMAPP | VSGI | MPAM | VMOVP | CIL | CIDbits | ||||||||||||||||||||
HCC | RES0 | PTA | SEIS | Devbits | ID_bits | ITT_entry_size | IMPLEMENTATION DEFINED | CCT | Virtual | Physical |
Reserved, RES0.
ITS cache invalidation behavior on disable.
INV | Meaning |
---|---|
0b0 | It is IMPLEMENTATION DEFINED whether ITS caches are invalidated on clearing GITS_CTLR.Enabled and GITS_BASER<n>.Valid. |
0b1 | ITS caches are invalidated on clearing GITS_CTLR.Enabled and GITS_BASER<n>.Valid. |
If GITS_TYPER.INV is 1, after the following sequence:
There is no cached information from the ITS memory structure pointed to by GITS_BASER<n>.
Indicates support for generating an interrupt on receiving unmapped MSI.
UMSIirq | Meaning |
---|---|
0b0 | Interrupt on unmapped MSI not supported. |
0b1 | Interrupt on unmapped MSI is supported. |
If GITS_TYPER.UMSI is 0, this field is RES0.
Indicates suport for reporting receipt of unmapped MSIs.
UMSI | Meaning |
---|---|
0b0 | Reporting of unmapped MSIs is not supported. |
0b1 | Reporting of unmapped MSIs is supported. |
nID
nID | Meaning |
---|---|
0b0 | Individual doorbell interrupt supported. |
0b1 | Individual doorbell interrupt not supported. |
Reserved, RES0.
SVPET
SVPET | Meaning |
---|---|
0b00 | vPE Table is not shared with Redistributors. |
0b01 | vPE Table is shared with the groups of Redistributors indicated by GITS_MPIDR.Aff3. |
0b10 | vPE Table is shared with the groups of Redistributors indicated by GITS_MPIDR fields Aff3 and Aff2. |
0b11 | vPE Table is shared with the groups of Redistributors indicated by GITS_MPIDR fields Aff3, Aff2 and Aff1. |
Reserved, RES0.
VMAPP
VMAPP | Meaning |
---|---|
0b0 | FEAT_GICv4 VMAPP command layout. |
0b1 | FEAT_GICv4p1 VMAPP command layout. |
Reserved, RES0.
VSGI
VSGI | Meaning |
---|---|
0b0 | Direct injection of SGIs is not supported. |
0b1 | Direct injection of SGIs is supported. |
Reserved, RES0.
MPAM
MPAM | Meaning |
---|---|
0b0 | MPAM is not supported. |
0b1 | MPAM is supported. |
Reserved, RES0.
Indicates the form of the VMOVP command.
VMOVP | Meaning |
---|---|
0b0 | When moving a vPE, software must issue a VMOVP on all ITSs that have mappings for that vPE. The ITSList and Sequence Number fields in the VMOVP command must ensure synchronization, otherwise behavior is UNPREDICTABLE. |
0b1 | When moving a vPE, software must only issue a VMOVP on one of the ITSs that has a mapping for that vPE. The ITSList and Sequence Number fields in the VMOVP command are RES0. |
Collection ID Limit.
CIL | Meaning |
---|---|
0b0 | ITS supports 16-bit Collection ID, GITS_TYPER.CIDbits is RES0. |
0b1 | GITS_TYPER.CIDbits indicates supported Collection ID size |
In implementations that do not support Collections in external memory, this bit is RES0 and the number of Collections supported is reported by GITS_TYPER.HCC.
Number of Collection ID bits.
Hardware Collection Count. The number of interrupt collections supported by the ITS without provisioning of external memory.
Collections held in hardware are unmapped at reset.
Reserved, RES0.
Physical Target Addresses. Indicates the format of the target address:
PTA | Meaning |
---|---|
0b0 | The target address corresponds to the PE number specified by GICR_TYPER.Processor_Number. |
0b1 | The target address corresponds to the base physical address of the required Redistributor. |
For more information, see 'RDbase' in ARM® Generic Interrupt Controller Architecture Specification, GIC architecture version 3.0 and version 4.0 (ARM IHI 0069).
SEI support. Indicates whether the virtual CPU interface supports generation of SEIs:
SEIS | Meaning |
---|---|
0b0 | The ITS does not support local generation of SEIs. |
0b1 | The ITS supports local generation of SEIs. |
The number of DeviceID bits implemented, minus one.
The number of EventID bits implemented, minus one.
Read-only. Indicates the number of bytes per translation table entry, minus one.
For more information about the ITS command 'MAPD', see MAPD.
IMPLEMENTATION DEFINED.
Cumulative Collection Tables.
CCT | Meaning |
---|---|
0b0 | The total number of supported collections is determined by the number of collections held in memory only. |
0b1 | The total number of supported collections is determined by number of collections that are held in memory and the number indicated by GITS_TYPER.HCC. |
If GITS_TYPER.HCC == 0, or if memory backed collections are not supported (all GITS_BASER<n>.Type != 100), this bit is RES0.
Indicates whether the ITS supports virtual LPIs and direct injection of virtual LPIs:
Virtual | Meaning |
---|---|
0b0 | The ITS does not support virtual LPIs or direct injection of virtual LPIs. |
0b1 | The ITS supports virtual LPIs and direct injection of virtual LPIs. |
Reserved, RES0.
Indicates whether the ITS supports physical LPIs:
Physical | Meaning |
---|---|
0b0 | The ITS does not support physical LPIs. |
0b1 | The ITS supports physical LPIs. |
This field is RES1, indicating that the ITS supports physical LPIs.
Component | Offset | Instance |
---|---|---|
GIC ITS control | 0x0008 | GITS_TYPER |
This interface is accessible as follows:
30/06/2021 1509:2239; 2a17f7750cfd1ab239f20f6cf29877ba8041794f4f5dd962f4e34e1ac282f76da4d6e7fc4cab087e
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