Accelerated Graphics Port Interface Specification

AGP3.0 Interface Specification
Rev. 1.0
142
5.9.6 GARTLO: AGP GART POINTER
Offset: CAPPTR + 18h
Size: 4 bytes
Table 73: GART Pointer
Bits Access Field Description
31:12 RW-D’0 baselo Bits[31:12] of the start of the Graphics AGP aperture Remapping
Table (GART). As a minimum the GART must be aligned on a 4KB
boundary
11:4 RZ-IW Reserved Reserved
3:0 RZ-IW Reserved Reserved
5.9.7 GARTHI: AGP GART POINTER HIGH
Offset: CAPPTR + 1Ch
Size: 4 bytes
Table 74: AGP Gart Pointer
Bits Access Field Description
31:0 R-W-D’0 basehi Bits[63:32] of the start of the Graphics AGP aperture Remapping
Table (GART). Software writes all zeroes in this register for systems
that only support 32-bit physical addresses.