Intel B940 Datasheet Page 253
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Datasheet, Volume 2 253
Processor Configuration Registers
2.17 Graphics Control Registers
2.17.1 MGGC—Graphics Control Register
All the Bits in this register are Intel TXT lockable.
B/D/F/Type: 0/2/0/PCI
Address Offset: 52–53h
Reset Value: 0030h
Access: RO
Bit Attr
Reset
Value
Description
15:12 RO 0h Reserved
11:8 RO 0h
GTT Graphics Memory Size (GGMS)
This field is used to select the amount of main memory that is pre-allocated
to support the Internal Graphics Translation Table. The BIOS ensures that
memory is pre-allocated only when Internal graphics is enabled.
GSM is assumed to be a contiguous physical DRAM space with DSM, and
BIOS needs to allocate a contiguous memory chunk. Hardware will drive the
base of GSM from DSM only using the GSM size programmed in the register.
0h = No memory pre-allocated. GTT cycles (Memory and IO) are not
claimed.
1h = No VT mode, 1 MB of memory pre-allocated for GTT.
3h = No VT mode, 2 MB of memory pre-allocated for GTT.
9h = VT mode, 2 MB of memory pre-allocated for 1 MB of Global GTT and 1
MB for Shadow GTT.
Ah = VT mode, 3 MB of memory pre-allocated for 1.5 MB of Global GTT and
1.5 MB for Shadow GTT.
Bh = VT mode, 4 MB of memory pre-allocated for 2 MB of Global GTT and 2
MB for Shadow GTT.
All unspecified encodings of this register field are reserved, hardware
functionality is not ensured if used.
7:4 RO 0011b
Graphics Mode Select (GMS)
This field is used to select the amount of main memory that is pre-allocated
to support the Internal Graphics device in VGA (non-linear) and Native
(linear) modes. The BIOS ensures that memory is pre-allocated only when
Internal graphics is enabled.
0h = No memory pre-allocated. Device 2 (IGD) does not claim VGA cycles
(Memory and IO), and the Sub-Class Code field within Device 2 function
0 Class Code register is 80h.
1h = DVMT (UMA) mode, 1 MB of memory pre-allocated for frame buffer.
2h = DVMT (UMA) mode, 4 MB of memory pre-allocated for frame buffer.
3h = DVMT (UMA) mode, 8 MB of memory pre-allocated for frame buffer.
4h = DVMT (UMA) mode, 16 MB of memory pre-allocated for frame buffer.
5h = DVMT (UMA) mode, 32 MB of memory pre-allocated for frame buffer.
6h = DVMT (UMA) mode, 48 MB of memory pre-allocated for frame buffer.
7h = DVMT (UMA) mode, 64 MB of memory pre-allocated for frame buffer.
8h = DVMT (UMA) mode, 128 MB of memory pre-allocated for frame buffer.
9h = DVMT (UMA) mode, 256 MB of memory pre-allocated for frame buffer.
BIOS Requirement: BIOS must not set this field to 000 if IVD (bit 1 of this
register) is 0.
3:2 RO 00b Reserved
- 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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