Intel B940 Datasheet Page 225

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Datasheet, Volume 2 225
Processor Configuration Registers
2.16.3 ECAP_REG—Extended Capability Register
This register reports DMA-remapping hardware extended capabilities.
6RO 1b
Protected High-Memory Region (PHMR)
0 = Protected high-memory region not supported.
1 = Protected high-memory region is supported.
5RO 1b
Protected Low-Memory Region (PLMR)
0 = Protected low-memory region not supported.
1 = Protected low-memory region is supported.
4RO 1b
Required Write-Buffer Flushing (RWBF)
0 = No write-buffer flushing needed to ensure changes to memory-resident
structures are visible to hardware.
1 = Software must explicitly flush the write buffers to ensure updates made
to memory-resident DMA-remapping structures are visible to hardware.
Refer to the VTd specification for more details on write buffer flushing
requirements.
3RO 0b
Advanced Fault Logging (AFL)
0 = Advanced fault logging not supported. Only primary fault logging is
supported.
1 = Advanced fault logging is supported.
2:0 RO 010b
Number of domains supported (ND)
000b = Hardware supports 4-bit domain-ids with support for up to 16
domains.
001b = Hardware supports 6-bit domain-ids with support for up to 64
domains.
010b = Hardware supports 8-bit domain-ids with support for up to 256
domains.
011b = Hardware supports 10-bit domain-ids with support for up to 1024
domains.
100b = Hardware supports 12-bit domain-ids with support for up to 4K
domains.
100b = Hardware supports 14-bit domain-ids with support for up to 16K
domains.
110b = Hardware supports 16-bit domain-ids with support for up to 64K
domains.
111b =Reserved.
B/D/F/Type: 0/0/0/DMIVC1REMAP
Address Offset: 8–Fh
Reset Value: 00C9008020E30272h
Access: RO
Bit Attr
Reset
Value
Description
B/D/F/Type: 0/0/0/DMIVC1REMAP
Address Offset: 10–17h
Reset Value: 0000000000001000h
Access: RO
Bit Attr
Reset
Value
Description
63:24 RO
00000000
00h
Reserved
23:20 RO 0h
Maximum Handle Mask Value (MHMV)
The value in this field indicates the maximum supported value for the Handle
Mask (HM) field in the interrupt entry cache invalidation descriptor
(iec_inv_dsc).
This field is valid only when the IR field is reported as set to 1.
19:18 RO 00b Reserved
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