G - Physics – 06 – F
Patent
G - Physics
06
F
354/239
G06F 9/46 (2006.01) G06F 12/10 (2006.01)
Patent
CA 2009717
ABSTRACT OF THE DISCLOSURE A multiprocessing system comprises a single translation lookaside buffer partitioned into a plurality of buffer areas, and a plurality of directory registers respectively corresponding to the buffer areas. Each register is partitioned into a first field and a second field having bit positions respectively assigned to processors. A directory controller selects one of the registers and writes a segmented virtual space identifier of a requesting processor into the first field of the selected register and a bit "1" into its second field in a position assigned to the requesting processor. If, during a nonshared-access mode, the directory controller accesses a buffer area corresponding to the selected register to load a copy of the translation tables from a main memory into the buffer area. During a shared-access mode, the directory controller searches all registers to detect a first one whose first field contains the segmented virtual space identifier of the requesting processor and whose second field contains a bit "1" in a position assigned to that processor and a second register whose first field contains the same identifier as the first and whose second field contains a bit "1" in a position assigned to a master processor to indicate the denial of access right. The bit "1" of the first register is reset to zero and a bit "1" is set in the second field of the second register in a position assigned to the requesting processor to indicate the grant of access right. In a subsequent, nonshared-access mode, one of the bits "1" in the second register is reset in a position assigned to the requesting processor and a copy of the translation tables is loaded into the buffer area corresponding to the register containing instructions issued from the requesting processor.
Corporation Nec
Smart & Biggar
LandOfFree
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