Virtual storage dynamic address translation mechanism for multip

Details Virtual storage dynamic address translation mechanism for multip Virtual storage dynamic address translation mechanism for multip

1988-12-15

1991-10-15

Lee, Thomas C.

Boots, shoes, and leggings

3642563, 3642565, 364254, 3642543, 3642546, 3642564, 3642548, 3642591, 3642604, 364452, 364955, 364956, 364957, 3649571, 3649573, 3649612, G06F 1206, G06F 1208, G06F 1210, G06F 926

Patent

active

050580035

ABSTRACT:
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.

REFERENCES:
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patent: 4961135 (1990-10-01), Uchihori
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