Specification Sheet
Datasheet, Volume 2 of 2 309
VC0PREMAP Registers
10.3 Extended Capability Register (ECAP)—Offset 10h
Register to report remapping hardware extended capabilities
Access Method
Default: F050DAh
Type: MEM
(Size: 64 bits)
Offset: [B:0, D:0, F:0] + 10h
6
3
6
0
5
6
5
2
4
8
4
4
4
0
3
6
3
2
2
8
2
4
2
0
1
6
1
2
8
4
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
0
0
0
0
0
1
0
1
0
0
0
0
1
1
0
1
1
0
1
0
RSVD
PSS
EAFS
NWFS
POT
SRS
ERS
PRS
PASID
DIS
NEST
MTS
ECS
MHMV
RSVD
IRO
SC
PT
RSVD
EIM
IR
DT
QI
C
Bit
Range
Default &
Access
Field Name (ID): Description
63:40
0h
RO
Reserved (RSVD): Reserved.
39:35
0h
RO
PSS: This field reports the PASID size supported by the remapping hardware for
requests with- PASID. A value of N in this field indicates hardware supports PASID field
of N+1 bits (For example, value of 7 in this field, indicates 8-bit PASIDs are
supported). Requests-with-PASID with PASID value beyond the limit specified by this
field are treated as error by the remapping hardware. This field is valid only when
PASID field is reported as Set.
34
0h
RO
EAFS:
0: Hardware does not support the extended-accessed (EA) bit in first-level paging-
structure entries.
1: Hardware supports the extendedaccessed (EA) bit in first-level paging-structure
entries. This field is valid only when PASID field is reported as Set.
33
0h
RO
NWFS:
0: Hardware ignores the "No Write" (NW) flag in Device-TLB translation requests, and
behaves as if NW is always 0.
1: Hardware supports the "No Write" (NW) flag in Device-TLB translation requests.
This field is valid only when Device-TLB support (DT) field is reported as Set.
32
0h
RO
POT:
0: Hardware does not support PASID-only Translation Type in extended-context-
entries
1: Hardware supports PASID-only Translation Type in extended-context-entries
31
0h
RO
SRS:
0: H/W does not support requests-with-PASID seeking supervisor privilege
1: H/W supports requests-with-PASID seeking supervisor privilege
30
0h
RO
ERS:
0: H/W does not support requests seeking execute permission
1: H/W supports requests seeking execute permission
29
0h
RO
PRS:
0: Hardware does not support Page Requests
1: Hardware supports Page Requests