Patent attributes
In a computer system, an address range is defined within the memory map. Addresses within the address range are mapped to other addresses within the memory map using an address relocation mechanism (e.g. the GART mechanism). The address range is divided into two portions. A graphics device may use the first portion to address a contiguous address space, and the addresses are remapped to other address using the address relocation mechanism. Particularly, the contiguous address space used by the graphics device may be remapped to non-contiguous pages elsewhere in the memory map. Other peripheral devices may use the second portion when performing data transfers to portions of the memory map above a predefined limit. The predefined limit may be the highest memory location in the memory map for which the peripheral device is capable of directly generating the address (e.g. 4 GB for a 32 bit address).
