Intel 815 manual Opcode 01h, Opcode 02h, Reserved MBZ

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Intel® 815 Chipset: Graphics Controller PRM, Rev 1.0

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11.2.2.GFXCMDPARSER_BREAKPOINT_INTERRUPT

This instruction will generate a breakpoint interrupt and cause the parser to stop until the interrupt is cleared by writing the Interrupt Identity Register. If the interrupting event is masked through the IMR, the parser continues parsing. However, if the event is unmasked in the IMR and the interrupt is not enabled through the IER, the parser halts until the IIR is cleared. In this case the software has to poll the IIR to check for this condition and clear the IIR as an interrupt will not occur.

DWord

Bit

Description

 

 

 

0

31:29

Client: 000 – Instruction Parser

 

 

 

 

28:23

Opcode: 01h

 

 

 

 

22:0

Reserved. MBZ

 

 

 

11.2.3.GFXCMDPARSER_USER_INTERRUPT

This instruction will generate a user-defined interrupt if the interrupt is enabled and not masked. The parser continues parsing after processing this instruction. If a user interrupt is currently outstanding (not yet cleared in the IIR) this packet has no effect.

Dword

Bit

Description

 

 

 

0

31:29

Client: 000 – Instruction Parser

 

 

 

 

28:23

Opcode: 02h

 

 

 

 

22:0

“Reserved MBZ”

 

 

 

154

Page 154
Image 154
Intel 815 manual Opcode 01h, Opcode 02h, Reserved MBZ