Intel® 815 Chipset: Graphics Controller PRM, Rev 1.0

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11.2.7.GFXCMDPARSER _DEST_BUFFER_INFO

The GFXCMDPARSER DEST_BUFFER_INFO instruction is used to specify the information about the destination buffer. This is an "immediate" instruction and therefore software must ensure that the Rendering Engine and the local cache are flushed prior to modifying the destination buffer information. The format is:

Dword

Bit

 

Description

 

 

 

0

31:29

Client: 000 – Instruction Parser

 

 

 

 

28:23

Opcode: 15h

 

 

 

 

22:6

Reserved: 00000h

 

 

 

 

5:0

DWORD_LENGTH: 00h

 

 

 

1

31:26

Reserved.

 

 

 

 

25:12

Base Address: This is the base address of the rendered scene in linear space. The

 

 

Memory Interface unit uses this address in conjunction with the Memory Fence Table

 

 

Registers to determine the virtual (Tiled) address of the dest buffer. This surface

 

 

address (linear) must be at least 4 KB aligned. in addition it must be 4 times pitch

 

 

aligned aligned.

 

 

 

 

11:2

Reserved. MBZ

 

 

 

 

1:0

Pitch: This is the pitch of the Back Buffer. This is used by the TLB in computing the

 

 

absolute address of the color requests.

 

 

00

= 512 bytes

 

 

01

= 1 KB

 

 

10

= 2 KB

 

 

11

= 4 KB

 

 

 

 

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Image 157
Intel 815 manual Opcode 15h, Reserved 00000h, Dwordlength 00h