发明授权
US5043878A System with real-time checking of privilege levels and the system's
state to allow access to internal resources of the system
失效
具有实时检查权限级别和系统状态的系统，以允许访问系统的内部资源
- 专利标题： System with real-time checking of privilege levels and the system's state to allow access to internal resources of the system
- 专利标题（中）： 具有实时检查权限级别和系统状态的系统，以允许访问系统的内部资源
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申请号： US393039申请日： 1989-08-09
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公开(公告)号： US5043878A公开(公告)日： 1991-08-27
- 发明人: Yasushi Ooi
- 申请人： Yasushi Ooi
- 申请人地址： JPX Tokyo
- 专利权人： NEC Corporation
- 当前专利权人： NEC Corporation
- 当前专利权人地址： JPX Tokyo
- 优先权： JPX60-29657 19850218
- 主分类号： G06F9/30
- IPC分类号： G06F9/30 ; G06F9/46
摘要：
A data processing apparatus has a plurality of execution status and is adapted to control in accordance with the respective execution conditions the allowance of the execution of an instruction requiring the reference to the internal resource. The processing apparatus also comprises a register for holding the execution status, and another register for holding information controlling the reference to the internal resource. A comparator responds to the contents of the first and second registers to output a signal indicating whether the reference is allowed or not. The output signal and a strobe signal are fed to a gate, which then controls an actual reference to the internal resource.
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