Intel 815 manual GC Register Memory Address Map, Address Offset Symbol Register Name Access

Intel® 815 Chipset: Graphics Controller PRM, Rev 1.0

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3.2.GC Register Memory Address Map

All GC registers are memory-mapped. In addition, the VGA and Extended VGA registers are I/O mapped.

Table 2.	Memory-Mapped Registers
	Address Offset	Symbol	Register Name	Access
	00000h−00FFFh		VGA and VGA Extended Registers	
			These registers are both memory and I/O mapped
			and are listed in the following table. Note that the I/O
			address and memory offset address are the same
			value for each register.
		Instruction and Interrupt Control Registers (01000h−02FFFh)
	01000h−01FFFh		Reserved. Do not write	
	02000h−0201Fh	FENCE[0:7]	Graphics Memory Fence Table Register [0:7]	R/W
	02020h−02023h	PGTBL_CTL	Page Table Control Register	R/W
	02024h−02027h	PGTBL_ER	Page Table Error Register	RO
	02028h−0202Bh	PGTBL_ERRMSK	Page Table Error Mask Register	R/W
	02030h–0207Fh	RINGBUF	Ring Buffer Registers	R/W
	02030h–0203Fh		Low Priority Ring Buffer (4 DWs)
	02040h–0204Fh		Interrupt Ring Buffer (4 DWs)
	02050h–0207Fh		Reserved
	02080h–02083h	HWS_PGA	Hardware Status Page Address Register	R/W
	02084h–02087h		Reserved	
	02088h–0208Bh	IPEIR	Instruction Parser Error Identification Register	RO
	0208Ch–0208Fh	IPEHR	Instruction Parser Error Header Register	RO
	02090h–02091h	INSTDONE	Instruction Stream Interface Done Register	RO
	02092h–02093h		Reserved	
	02094h–02097h	NOPID	NOP Identification Register	RO
	02098h−002099h	HWSTAM	Hardware Status Mask Register	R/W
	0209Ah–0209Fh		Reserved	
	020A0h−020A1h	IER	Interrupt Enable Register	R/W
	020A2h–020A3h		Reserved	
	020A4h−020A5h	IIR	Interrupt Identity Register	R/WC
	020A6h–020A7h		Reserved	
	020A8h−020A9h	IMR	Interrupt Mask Register	R/W
	020AAh–020ABh		Reserved	
	020ACh−020ADh	ISR	Interrupt Status Register	RO
	020AEh−020AFh		Reserved	
	020B0h−020B1h	EIR	Error Identity Register	R/WC
	020B2h−020B3h		Reserved	
	020B4h−020B5h	EMR	Error Mask Register	R/W
	020B6h−020B7h		Reserved	
	020B8h−020B9h	ESR	Error Status Register	RO
	020BAh−020BFh		Reserved	

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