×

Paged memory management unit having stack change control register

  • US 4,766,537 A
  • Filed: 01/02/1986
  • Issued: 08/23/1988
  • Est. Priority Date: 01/02/1986
  • Status: Expired due to Term
First Claim
Patent Images

1. In a paged memory management unit (PMMU) which cooperates with a processor to provide access by a calling module to called module, each of said modules having a selected one of a plurality of access levels and being allocated a new stack area by the processor in response to the processor receiving a change stack signal, the improvement comprising:

  • storage means for selectively storing a stack change indicator for each of said access levels, each of said indicators being selectively set in response to a respective signal from said processor; and

    control means, responsive to said storage means, for providing said change stack signal to said processor if any stack change indicator in said storage means corresponding to an access level between the access level of the calling module and the access level of the called module, including the access level of the called module, is set.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×