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Processor Configuration Registers
212 Datasheet, Volume 2
2.15.29 IOTLB_REG—IOTLB Invalidate Register
Register to control page-table entry caching. The act of writing the upper byte of the
IOTLB_REG with IVT field set causes the hardware to perform the IOTLB invalidation.
There is an IOTLB_REG for each IOTLB Invalidation unit supported by hardware.
B/D/F/Type: 0/0/0/VC0PREMAP
Address Offset: 108–10Fh
Reset Value: 0000000000000000h
Access: RW, RO
Bit Attr
Reset
Value
Description
63 RW 0b
Invalidate IOTLB (IVT)
Software requests IOTLB invalidation by setting this field.
Software must also set the requested invalidation granularity by
programming the IIRG field.
Hardware clears the IVT field to indicate the invalidation request is complete.
Hardware also indicates the granularity at which the invalidation operation
was performed through the IAIG field. Software must not submit another
invalidation request through this register while the IVT field is set, nor
update the associated Invalidate Address register.
Software must not submit IOTLB invalidation requests through any of the
IOTLB invalidation units when there is a context-cache invalidation request
pending at this DMA-remapping hardware unit.
When more than one IOTLB invalidation units are supported by a DMA-
remapping hardware unit, software may submit IOTLB invalidation request
through any of the currently free units while there are pending requests on
other units.
Refer to the VTd specification for software programming requirements.
Hardware implementations reporting write-buffer flushing requirement
(RWBF=1 in Capability register) must implicitly perform a write buffer
flushing before reporting invalidation complete to software through the IVT
field.
Refer to the VTd specification for write buffer flushing requirements.
62:60 RW 0h
IOTLB Invalidation Request Granularity (IIRG)
When requesting hardware to invalidate the IOTLB (by setting the IVT field),
software writes the requested invalidation granularity through this IIRG field.
Following are the encodings for the IIRG field.
000 = Reserved.
001 = Global invalidation request.
010 = Domain-selective invalidation request. The target domain-id must be
specified in the DID field.
011 = Domain-page-selective invalidation request. The target address, mask
and invalidation hint must be specified in the Invalidate Address
register, and the domain-id must be provided in the DID field.
100–111 = Reserved.
Hardware implementations may process an invalidation request by
performing invalidation at a coarser granularity than requested. Hardware
indicates completion of the invalidation request by clearing the IVT field. At
this time, the granularity at which actual invalidation was performed is
reported through the IAIG field.
- Datasheet – Volume 2 1
- Legal Lines and Disclaimers 2
- Contents 3
- 4 Datasheet, Volume 2 4
- Datasheet, Volume 2 5 5
- 6 Datasheet, Volume 2 6
- Datasheet, Volume 2 7 7
- 8 Datasheet, Volume 2 8
- Datasheet, Volume 2 9 9
- 10 Datasheet, Volume 2 10
- Datasheet, Volume 2 11 11
- Revision History 12
- 1 Introduction 13
- Introduction 14
- 2 Processor Configuration 15
- 2.2 System Address Map 17
- 18 Datasheet, Volume 2 18
- 2.2.1 Legacy Address Range 19
- Datasheet, Volume 2 21 21
- 2.2.2.2 TSEG 22
- 2.2.2.5 Pre-allocated Memory 23
- 2.2.2.7 Intel 24
- Management Engine (Intel 24
- ME) UMA 24
- Datasheet, Volume 2 25 25
- 2.2.2.10 High BIOS Area 26
- Datasheet, Volume 2 27 27
- 2.2.3.1 Programming Model 28
- HOST/SYSTEM VIEW 29
- PHYSICAL MEMORY 29
- (DRAM CONTROLLER VIEW) 29
- Datasheet, Volume 2 33 33
- 34 Datasheet, Volume 2 34
- 2.2.9 I/O Address Space 35
- 36 Datasheet, Volume 2 36
- Datasheet, Volume 2 37 37
- 2.4 Configuration Mechanisms 38
- Datasheet, Volume 2 39 39
- 40 Datasheet, Volume 2 40
- Datasheet, Volume 2 41 41
- 42 Datasheet, Volume 2 42
- Datasheet, Volume 2 43 43
- 2.6 I/O Mapped Registers 44
- 2.7.6 CC—Class Code Register 49
- TXT Lockable 54
- 1:0 to 11b 56
- 4) from 58
- B0h, bits 15:4) 58
- 2.8 MCHBAR Registers 66
- 00h RW 67
- Register Symbol Register Name 67
- 208–209h 73
- 20A–20Bh 74
- 24D–24Fh 74
- 250-251h 75
- 252–255h 76
- 256–257h 77
- 258–25Ah 77
- 269–26Eh 79
- 298–29Bh 82
- 29C–29Fh 84
- 2B4–2B7h 84
- 600–601h 86
- 602–603h 86
- 604–605h 86
- 64D–64Fh 88
- 650–651h 88
- 652–655h 89
- 656–657h 90
- 658–65Ah 90
- 660–663h 91
- 6B4–6B7h 93
- C20–C27h 94
- 1001–1002h 94
- 1004–1005h 95
- 101E–101Fh 100
- Register 107
- 10EC–10EDh 108
- 2C20–2C22h 109
- 2.9 EPBAR Registers 110
- 2.10 PCI Device 1 Registers 115
- PCI device 117
- Port Command Register 140
- 11:10 RW-O 11b 143
- OS's during run time 155
- 104–107h 156
- 108–10Bh 157
- 10C–10Dh 157
- 110–113h 158
- 23 RO 0b Reserved 158
- 114–117h 158
- 11A–11Bh 159
- 2.12 DMIBAR Registers 161
- Declaration Capability 169
- 2.13.6 CC—Class Code Register 177
- Range Address Register 179
- GMADR register 180
- 2.14 Device 2 I/O Registers 183
- 100–107h 211
- 108–10Fh 212
- 200–20Fh 214
- F00–F03h 215
- F04–F07h 216
- Dedication 217
- F08–F0Bh 218
- FFC–FFFh 219
- 2.16 DMI VC1 REMAP Registers 221
- 2.17.2 GFXPLL1—GFX PLL BIOS 254
- 2.18 GFXVTBAR Registers 255
- Address Register 281
- 2.19 PCI Device 6 Registers 288
- 2.19.45 RSTS—Root Status 327
- 2.21 Intel 332
- Specific Registers 332
- 110–117h 333
- 330–337h 333
- Lower Half Register 334
- Upper Half Register 334
- QuickPath Architecture 335
- System Address Decode 335
- Register Description 335
- QPI Link 0 Registers 340
- QPI Physical 0 Registers 341
- 3.4 PCI Standard Registers 342
- 3.4.4 CCR—Class Code Register 344
- Identification Register 345
- 3.4.7 PCICMD—Command Register 346
- 3.5.1 MAX_RTIDS 349
- 3.6.1 SAD_PAM0123 349
- 3.6.2 SAD_PAM456 351
- 3.6.3 SAD_HEN 352
- 3.6.4 SAD_SMRAM 353
- 3.6.5 SAD_PCIEXBAR 354
- 3.7 Intel 356
- QPI Link Registers 356
- 3.8 Intel 357
- QPI Physical Layer Registers 357
- 360 Datasheet, Volume 2 360
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