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    • 41. 发明授权
    • Method and apparatus for virtualizing off-screen memory of a graphics
engine
    • 用于虚拟化图形引擎的屏幕外存储器的方法和装置
    • US5757386A
    • 1998-05-26
    • US514214
    • 1995-08-11
    • Joseph Celi, Jr.John P. CoffeyJonathan Mark Wagner
    • Joseph Celi, Jr.John P. CoffeyJonathan Mark Wagner
    • G06F12/02G06F12/00G06T1/60G09G5/36G09G5/39G06F15/167
    • G09G5/36
    • An application request for off-screen VRAM is satisfied transparently to the application by allocating off-screen VRAM, if available, or system RAM if off-screen VRAM is unavailable. In addition, a list is kept of previous memory requests so that requests which were satisfied by allocating system RAM can be switched to off-screen VRAM, if such off-screen VRAM should later become available. Allocation of off-screen VRAM is controlled by a device driver that responds to various application memory requests and controls the off-screen VRAM resources, among other things. The device driver receives an allocation request for off-screen VRAM and determines whether the request may be honored with available off-screen VRAM resources. If the request can be honored with available off-screen VRAM resources, the device driver allocates a portion of the available off-screen VRAM resources to honor the request and decreases the amount of available off-screen VRAM resources. If the request cannot be honored with available off-screen resources, the device driver allocates a portion of system RAM to honor the request. The device driver also receives and processes requests to deallocate, previously allocated, off-screen VRAM resources in order to increase the amount of available off-screen VRAM resources. As a result of the increased resources, the device driver may transfer a request that was previously honored with system RAM to the off-screen VRAM resources to honor that request with off-screen VRAM resources.
    • 如果离线VRAM不可用,通过分配离屏VRAM(如果可用)或系统RAM,对应用程序透明地满足屏幕外VRAM的应用请求。 此外,保留先前存储器请求的列表,以便如果这样的屏幕外VRAM应该可用,则可以将通过分配系统RAM满足的请求切换到屏幕外VRAM。 离屏VRAM的分配由响应各种应用存储器请求并控制屏幕外VRAM资源的设备驱动程序来控制。 设备驱动程序接收屏幕外VRAM的分配请求,并确定是否可以使用可用的离屏VRAM资源来遵循该请求。 如果可以使用可用的屏幕外VRAM资源来满足该请求,则设备驱动程序分配可用的离屏VRAM资源的一部分以符合该请求并减少可用的离屏VRAM资源的数量。 如果请求无法使用可用的屏幕外资源,设备驱动程序会分配一部分系统RAM以符合该请求。 设备驱动程序还接收并处理请求以释放先前分配的离屏VRAM资源,以便增加可用的离屏VRAM资源的数量。 作为资源增加的结果,设备驱动程序可以将以前用系统RAM授予的请求传送到屏幕外的VRAM资源,以使用屏幕外的VRAM资源来满足该请求。