Intel B940 Datasheet Page 287

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Datasheet, Volume 2 287
Processor Configuration Registers
2.18.30 VTPOLICY—VT Policy Register
B/D/F/Type: 0/2/0/GFXVTBAR
Address Offset: FFC–FFFh
Reset Value: 4000_0000h
Access: RW-L, RW-O, RO
Bit Attr
Reset
Value
Description
31 RW-O 0b
DMA Remap Engine Policy Lock-Down (DMAR_LCKDN)
This register bit protects all the DMA remap engine specific policy
configuration registers. Once this bit is set by software, all the DMA remap
engine registers within the range F00h to FFCh will be read-only. This bit can
only be clear through platform reset.
30 RO 1b
CI VT Level 2 Cache allocation mode (CIL2TLBMODE)
1 = Uniform replacement algorithm.
29 RW-L 0b
CI VT Level 2 Cache Disable (CIL2TLBDIS)
This bit will disable caching of Level 2 HPA completions within CI if set.
28 RW-L 0b
CI VT Level 1 Cache Disable (CIL1TLBDIS)
This bit will disable caching of Level 1 HPA completions within CI if set.
0 = Level 1 IOTLB is enabled and will be used to cache level 1 page table
translations
1 = Level 1 IOTLB is disabled and will not be used to cache level 1 page
table translation.
27 RW-L 0b
CI Remap Engine Policy Control (CIR_CTL)
cic_scr_reserved_fault_en.
0 = "Default" Hardware support's reserved field programming faults in root,
context and page translation structure (that is, fault code of Ah, Bh, Ch).
1 = Hardware ignores reserved field programming faults in the root, context
and page translation structure.
26:5 RO 0h Reserved
4RW-L 0b
Level 1 Allocation Mode Selection (L1ALOCMODE)
0 = Enables Round Robin re-allocation mode.
1 = Enables LRU re-allocation mode.
3RW-L 0b
Level 1 Cache LRU mode Selection (L1LRUMODE)
0 = Enables the LRU scheme to use a first avail starting from entry 0 to find
one of the oldest entries when more than 1 are available.
1 = Enables the LRU scheme to use a first avail starting from a round robin
selected entry.
2RW-L 0b
Context Cache Disable (CCDIS)
0 = Context Cache is enabled and will be used to cache context translations
1 = Context Cache is disabled and will not be used to cache context
translation.
1RW-L 0b
Level 1 IOTLB Disable (L1TLBDIS)
0 = Level 1 IOTLB is enabled and will be used to cache level 1 page table
translations
1 = Level 1 IOTLB is disabled and will not be used to cache level 1 page
table translation.
0RW-L 0b
Level 3 IOTLB Disable (L3TLBDIS)
0 = Level 3 IOTLB is enabled and will be used to cache level 3 page table
translations
1 = Level 3 IOTLB is disabled and will not be used to cache level 3 page
table translation.
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