User's Manual

Intel® 815 Chipset: Graphics Controller PRM, Rev 1.0
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11.2.14. GFXCMDPARSER_LOAD_SCAN_LINES_EXCL
This instruction is used to initialize the scan line window registers in the Display engine. If the display
refresh is outside this window, the display engine asserts a signal that is used by the instruction parser to
process the WAIT_FOR_EVENT instruction. This instruction overrides any previous INCL instruction.
The format is:
Word Bits Description
0 31:29 Client: 000 – Instruction Parser
28:23 Instruction Target: 13h
22:6 Reserved.
5:0 DWord Length: 00h
1 31:16 Start Scan Line Number. (Line 0 is the first line of the display frame)
15:0 End Scan Line Number. (Line 0 is the first line of the display frame)
11.2.15. GFXCMDPARSER_STORE_DWORD_IMM
This instruction immediately causes a system write of the data word in the packet to the address which is
also in the instruction packet. Note: All store DWords will invalidate the host - graphics pre-fetch cache.
The GFXCMDPARSER_STORE_DWORD_IMM instruction format is:
DWord Bit Description
0 31:29 Client: 000 – Instruction Parser
28:23 Instruction Target: 20h
22:6 Reserved.
5:0 DWord Length: 01h
1 31:2 Address: DWord aligned. The hardware only uses bits 31:2.
1:0 Reserved. MBZ
2 31:0 Data Word
11.2.16. GFXCMDPARSER_STORE_DWORD_INDEX
This instruction immediately causes a system write of the data word in the packet to the address which is
provided in the Hardware Status Page Address Register at offset specified.
Note: All store DWords will invalidate the host-graphics prefetch cache.
DWord Bit Description
0 31:29 Client: 000 – Instruction Parser
28:23 Instruction Target: 21h
22:6 Reserved: 0000h
5:0 Dword Length: 01h
1 31:12 Reserved.
11:2 Dword Offset into a page: A (11:2)
1:0 Reserved.
2 31:0 Data Word