Hardware portrait mode support

A system for displaying data on a display, the system comprising:

• an addressable memory for holding data for display, wherein a region of the memory defines a display area having real first and second offsets;
• an interface for receiving a request to access data at a first address in the memory, wherein the first address specifies a position in the display area using a Virtual fist offset and the real second offset, wherein the real second offset is not equal to a power of two;
• and
• an address translator for receiving the request from the interface and selectively translating the request from the first address to a second address, wherein the second address specifies the position in the display area using the real first and second offsets.

A display subsystem for a computer system supporting first and second orientations of a display coupled to the computer system, the display subsystem comprising:

• a memory for holding display data, the memory comprising:
• a first access region adapted to hold display data for the first orientation of the display, wherein the first access region is defined by a first offset exceeding a first displayed extent of the display and a second offset equal to a second displayed extent of the display, wherein the second offset is not equal to a power of two;
• and
• a second access region separate from the first access region and adapted to hold display data for the second orientation of the display;
• and
• an address translator for receiving a memory request using the first and second offsets to specify an address in the first access region and for translating the memory request to reflect the first orientation of the display.

A display subsystem for a computer system supporting first and second orientations of a display coupled to the computer system, the display subsystem comprising:

• a memory for holding display data, the memory comprising:
• a first access region adapted to hold display data for the first orientation of the display, wherein the first access region is defined by X-ofst(Real), which defines an extent of the display in an X dimension, X-ofst(Virtual), which defines an extent in the X dimension exceeding X-ofst(Real), and Y-ofst, which defines an extent of the display in a Y dimension, and wherein the Y-ofst is not equal to a power of two;
• and
• a second access region separate from the first access region and adapted to hold display data for the second orientation of the display;
• and
• an interface for receiving memory requests from the computer system, the memory requests specifying addresses in the first and second access regions, wherein a memory request specifies an address in the first access region using X-ofst(Virtual) and Y-ofst.