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    • 9. 发明授权
    • Method and apparatus for the flow control of devices
    • 用于设备流量控制的方法和装置
    • US5016161A
    • 1991-05-14
    • US413834
    • 1989-09-28
    • James Van LooSusan CarrieJerald EvansJeffrey Spirn
    • James Van LooSusan CarrieJerald EvansJeffrey Spirn
    • G06F9/50
    • G06F9/5011
    • The system of the present invention provides for the flow control of commands to devices connected through the system's memory management unit and is particularly useful in a multi-tasking computer system in which multiple processes access the same device. In the method and apparatus of the present invention, devices that are connected to the system through the MMU are controlled using the page fault mechanism of the MMU and the page fault handler in each segment. Addresses are allocated in the process address space for each process to provide for the addressing of the devices and device queues connected through the MMU, such that one device or one device queue is mapped into one segment of each process address space that will access the device. The "valid bits" associated with each page in a segment are turned on/off by the process or operating system in order to control the device. If the valid bits are off or reset and an attempt is made to access at the address, a page fault occurs and the page fault mechanism invokes the page fault handler of the corresponding segment. The page fault mechanism of the MMU and the page fault handler of each segment are then utilized to determine the reason the page fault occurred with respect to a particular process and perform predetermining steps to control the flow of commands to the device.
    • 本发明的系统提供对通过系统的存储器管理单元连接的设备的命令的流量控制,并且在多任务计算机系统中特别有用,其中多个进程访问相同的设备。 在本发明的方法和装置中,使用MMU的页面故障机制和每个段中的页面故障处理程序来控制通过MMU连接到系统的设备。 在每个进程的进程地址空间中分配地址以提供通过MMU连接的设备和设备队列的寻址,使得一个设备或一个设备队列被映射到将访问设备的每个进程地址空间的一个段 。 通过进程或操作系统打开/关闭与段中的每个页面相关联的“有效位”,以便控制该设备。 如果有效位关闭或重置,并尝试访问地址,则会发生页面错误,页面错误机制调用相应段的页面错误处理程序。 然后使用MMU的页面故障机制和每个段的页面故障处理程序来确定页面故障相对于特定进程发生的原因,并执行预定步骤来控制到设备的命令流。