Data buffer having separate lock bit storage array

Details Data buffer having separate lock bit storage array Data buffer having separate lock bit storage array

1983-12-12

1986-05-13

Springborn, Harvey E.

Boots, shoes, and leggings

G06F 1210, G06F 1214

Patent

active

045890927

ABSTRACT:
A separate lock bit array (LBA) is provided in combination with a translation lookaside buffer (TLB) in a data processing system such that the lock bits are stored in and accessed from the LBA. A segment register with a portion for an "S" bit is included and when S=1, a translation operation for the lock bits is performed in parallel with the TLB accessing by use and operation of the LBA. In such operation, when S=1, lower order virtual bits from a central processing unit (CPU) address register are applied to the LBA to select one of the rows of the LBA which consists of virtual address bits and lock bits. Segment identification bits from the segment register are combined with virtual bits from the CPU address register and are applied to first and second compare circuits. If there is a match in the first compare circuit with a first group of virtual bits from an LBA location, a first flag signal is generated and applied to a gate circuit to gate out a first associated group of lock bits from a first location. Likewise, the combination of bits are compared with VA'.sub.b bits in the second compare circuit, and if a match occurs in the second compare circuit, a second flag signal is produced which is applied to a gate to gate out a second associated group of lock bits from a second location of the LBA.

REFERENCES:
patent: 4037214 (1977-07-01), Birney et al.
patent: 4096573 (1978-06-01), Heller et al.
patent: 4136385 (1979-01-01), Gannon et al.
patent: 4145738 (1979-03-01), Inoue et al.
patent: 4170039 (1979-10-01), Beacom et al.
patent: 4332010 (1982-05-01), Messina et al.
patent: 4347565 (1982-08-01), Kaneda et al.
patent: 4400770 (1983-08-01), Chan et al.
U.S. pending application Ser. No. 246,788 filed 3/28/81 by Chan et al. Cache Locking Controls in a Multiprocessor.

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