Address translation mechanism for multiple-sized pages

Details Address translation mechanism for multiple-sized pages Address translation mechanism for multiple-sized pages

Category

G - Physics

Subcategory

06

Subsubcategory

F

CPC

354/239

IPC codes

G06F 12/10 (2006.01)

Type

Patent

Patent number

CA 2005463

Description

A dynamic address translation mechanism includes a first directory-look-aside-table (DLAT) for 4KB page sizes and a second DLAT for 1MB page sizes. The page size does need not be known prior to DLAT presentation. When a virtual address is presented for translation, it is applied simultaneously to both DLATs for translation by either DLAT if it contains a page address entry corresponding to the virtual address presented. If a DLAT "miss" occurs, segment/page table searching is initiated. The DLAT page sizes are preferably made equal to the segment/page sizes and placed on 4KB and 1MB boundaries. Virtual page addresses lie within either a 1MB page or a 4KB page, and an entry for any virtual address can exist in only one (not both) of the DLATs.

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