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US 8,243,088 B2Granted
Two dimensional memory access controller
AssigneePresagis
InventorJim Jonas
Life of this patent
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Abstract
A data processing system may include a display, the display having a display surface, and logic to modify the address signals of a graphics processing unit (GPU) if the address signals do not fall within a two-dimensional range of authorized pixel locations corresponding to a subset of the display surface, and to propagate the address signals unmodified to a display memory otherwise.
Claims13
A data processing system including a display, the display having a display surface, the system comprising:
- logic to derive a two dimensional pixel location on a display screen from address signals of a graphics processing unit (GPU);
- logic to compare the derived two dimensional pixel location to a two dimensional range of authorized pixel locations corresponding to a subset of a display surface;
- logic to modify the address signals of a graphics processing unit (GPU) if the address signals do not fall within the two-dimensional range of authorized pixel locations corresponding to the subset of the display surface, and to propagate the address signals unmodified to a display memory otherwise.
A data processing system including a display, the display having a display surface, the system comprising:
- logic to intercept addresses between a graphics processing unit (GPU) and a display memory, and to modify values of unauthorized addresses but not modify values of authorized addresses;
- wherein it is determined if the addresses are authorized addresses by deriving a two dimensional pixel location on a display screen from the addresses, and comparing the derived two dimensional pixel location to a two dimensional range of authorized pixel locations corresponding to a subset of the display surface.
Dependencies are inferred from the claim text.