Apparatus to map virtual pages to disparate-sized, non-contiguous real pages

A method performed by a data processing system comprising a system processor, a graphics processor, and a memory coupled to the processors, the memory capable of storing real pages of size X, the memory storing an address translation driver comprising a plurality of address translation instructions, and at least one of the processors capable of executing selected ones of the address translation instructions and of executing instructions within an operating system organized in virtual pages of size Y, wherein X and Y are positive integers, and wherein Y is greater than X, the method comprising the following operations:

• mapping a virtual page into a plurality of non-contiguous real pages;
• wherein a virtual page is mapped into Z=Y/X non-contiguous real pages;
• wherein Z is not an integer;
• and
• wherein Z is rounded up to the nearest integer.

A data processing system comprising a system processor, a graphics processor, a local memory, and a main memory coupled to the processors and to the local memory, the main memory capable of storing real pages of size X, the local memory to store an address translation driver comprising a plurality of address translation instructions, and at least one of the processors capable of executing selected ones of the address translation instructions and of executing instructions within an operating system organized in virtual pages of size Y, wherein X and Y are positive integers, and wherein Y is greater than X, the address translation instructions comprising the following operations:

• determining the size X of the real pages by executing a first address translation operation including at least a first one of the plurality of address translation instructions;
• determining the size Y of the virtual pages by executing a second address translation operation including at least a second one of the plurality of address translation instructions;
• determining Z=Y/X by executing a third address translation operation including at least a third one of the plurality of address translation instructions;
• determining that Z is not an integer by executing a fourth address translation operation including at least a fourth one of the plurality of address translation instructions;
• rounding Z up to the nearest integer by executing a fifth address translation operation including at least a fifth one of the plurality of address translation instructions;
• and
• mapping a selected virtual page into Z non-contiguous real pages in a page table by executing a sixth address translation operation including at least a sixth one of the plurality of address translation instructions.

A computer-readable medium having computer-executable instructions that, when executed, result in operations being performed in a data processing system, the data processing system comprising a system processor, a graphics processor, and a memory coupled to the processors, the memory capable of storing real pages of size X, the memory storing an address translation driver comprising a plurality of address translation instructions, and at least one of the processors capable of executing selected ones of the address translation instructions and of executing instructions within an operating system organized in virtual pages of size Y, wherein X and Y are positive integers, and wherein Y is greater than X, the operations comprising:

• determining the size X of the real pages by executing a first address translation operation including at least a first one of the plurality of address translation instructions;
• determining the size Y of the virtual pages by executing a second address translation operation including at least a second one of the plurality of address translation instructions;
• determining Z=Y/X by executing a third address translation operation including at least a third one of the plurality of address translation instructions;
• determining that Z is not an integer by executing a fourth address translation operation including at least a fourth one of the plurality of address translation instructions;
• rounding Z up to the nearest integer by executing a fifth address translation operation including at least a fifth one of the plurality of address translation instructions;
• and
• mapping a selected virtual page into Z non-contiguous real pages in a page table by executing a sixth address translation operation including at least a sixth one of the plurality of address translation instructions.