Paged memory management unit having stack change control registe

Details Paged memory management unit having stack change control registe Paged memory management unit having stack change control registe

1986-01-02

1988-08-23

Heckler, Thomas M.

Boots, shoes, and leggings

G06F 1214

Patent

active

047665378

ABSTRACT:
A paged memory management unit (PMMU) adapted to prevent unauthorized access by a calling module executing in a data processor to a called module having a higher access level. A Stack Change Control Register in the PMMU has a bit corresponding to each valid access level. If the PMMU determines that any bit in the Stack Change Control Register corresponding to an access level between the access level of the calling module and the called module, including the access level of the called module, is set, a Change Stack bit in a Status Register is set to indicate that the processor should allocate a new stack for the called module. Both the Stack Change Control Register and the Status Register are accessible to the processor.

REFERENCES:
patent: 3893084 (1975-07-01), Kotok et al.
patent: 4041462 (1977-07-01), Davis et al.
patent: 4366537 (1982-12-01), Heller et al.
patent: 4430701 (1984-02-01), Christian et al.
patent: 4454580 (1984-06-01), Page et al.

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