User's Manual

Intel® 815 Chipset: Graphics Controller PRM, Rev 1.0
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16.1.6. HWS_PGA—Hardware Status Page Address Register
Address Offset: 02080h
Default Value: 1FFFF000h.
Access: Read/Write
Size: 32 bits
Hardware status page physical address. The programmed address should be 4 KB aligned. Bits [11:0] are
hardwired to 0. This Page will be used to report hardware status into system memory as follows.
Note: For the GMCH bits 31:29 must be “0”.
31 29 28 12 11 0
Must be 0s Base Physical Address of Status
Page [28:12]
0s (hardwired)
DWord
Offset
Description
0 Report Interrupt Status Register.
1 Report Low Priority Ring Head Pointer.
2 Report Interrupt Ring Head Pointer.
3 Reserved for other ring.
(1K-1): 4 Can be Written through indexed store DWord instruction.