Universal PTE backlinks for page table accesses

Details Universal PTE backlinks for page table accesses Universal PTE backlinks for page table accesses

1996-05-03

1999-02-16

Chan, Eddie P.

Electrical computers and digital processing systems: memory

Address formation

Address mapping

G06F 1210

Patent

active

058731270

ABSTRACT:
A system for accessing page table entries is disclosed. The system provides access to a page table entry mapping a predetermined physical page of memory. The system includes a physical page data base having an entry for each physical page of memory. Each physical page data base entry contains backlink information regarding an associated physical page of memory. The present system obtains a physical page data base entry associated with the predetermined physical page of memory from the physical page data base. The system uses a reserved page table entry, for example mapped by shared space, to build a virtual window. The virtual window provides a virtual address that may be used to access the page table entry mapping the predetermined physical page of memory. The virtual address provided by the virtual window is mapped to physical memory by the reserved page table entry. In a further aspect of the invention, the present system determines whether the page table entry mapping the predetermined physical page of memory is accessible in the current process context. If the page table entry mapping the predetermined physical page of memory is not currently accessible, a virtual window is built using the reserved page table entry. If the page table entry mapping the predetermined physical page of memory is currently accessible, no virtual window is built. An organization of the page table into a tree structure is further disclosed.

REFERENCES:
patent: 5101485 (1992-03-01), Perazzoli, Jr.
patent: 5239635 (1993-08-01), Stewart et al.
patent: 5652854 (1997-07-01), Wong

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