Virtual address window for accessing physical memory in a comput

Details Virtual address window for accessing physical memory in a comput Virtual address window for accessing physical memory in a comput

1997-08-29

2000-04-25

Nguyen, Hiep T

Electrical computers and digital processing systems: memory

Address formation

Address mapping

711 6, 711165, 711206, 711209, G06F 1210

Patent

active

06055617&

ABSTRACT:
Physical memory is accessed by associating identified memory with a window of virtual address space whose size and location are specified by an application program. In the typical application of the invention, the virtual window is smaller in size than the associated memory. One or more virtually-windowed address translations are then established between portions of the windowed address space and the corresponding portions of the physical memory. Additional physical memory can be accessed with the same virtual address space by establishing new virtually-windowed address translations with other portions of the physical memory. In the preferred embodiment of the invention, the physical memory is identified, attached to the virtual window, and the address translation is established by the computer's operating system in response to a series of system calls from an application program. These calls permit the application program such as a database program to access a physical data space that is larger in size than the program's virtual address space.

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