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    • 2. 发明授权
    • System for transferring data between processors via dual buffers within
system memory with first and second processors accessing system memory
directly and indirectly
    • 用于通过系统存储器中的双缓冲器在处理器之间传送数据的系统,其中第一和第二处理器直接和间接地访问系统
    • US5396597A
    • 1995-03-07
    • US862914
    • 1992-04-03
    • William K. BodinDavid M. HydeTatchi P. LayJames WilkinsonSusan Yee
    • William K. BodinDavid M. HydeTatchi P. LayJames WilkinsonSusan Yee
    • G06F13/16G06F15/02
    • G06F13/1673
    • A method and apparatus for the enhancing efficiency of a data processing system which includes a host microprocessor, a system memory, and a graphics adapter for producing an enhanced graphics display. The graphics adapter is coupled to the data processing system by a bus and includes a video memory and an adapter microprocessor, wherein the adapter microprocessor is less powerful than the host microprocessor in the data processing system. The method and apparatus of the present invention includes the establishment of a stage buffer from a portion of the system memory with the stage buffer, including at least two buffer sections. A first portion of data is transferred from the system memory into a first buffer section. Next, a second portion of data is transferred from the system memory into a second buffer section, while the adapter microprocessor is simultaneously retrieving the first portion of data from the first buffer section and transferring that first portion of data across the bus to the video memory, wherein host microprocessor is available to perform other tasks. When the adapter microprocessor has transferred the data to the video memory from the first buffer section, the host microprocessor fills the first buffer section with more data, while the adapter microprocessor retrieves data from the second buffer section. This process continues until all the data has been transferred.
    • 一种用于提高数据处理系统的效率的方法和装置,其包括主微处理器,系统存储器和用于产生增强图形显示的图形适配器。 图形适配器通过总线耦合到数据处理系统,并且包括视频存储器和适配器微处理器,其中适配器微处理器的功能不如数据处理系统中的主机微处理器。 本发明的方法和装置包括从具有级缓冲器的系统存储器的一部分建立级缓冲器,包括至少两个缓冲区段。 数据的第一部分从系统存储器传送到第一缓冲器部分。 接下来,数据的第二部分从系统存储器传送到第二缓冲器部分,而适配器微处理器同时从第一缓冲器部分检索数据的第一部分,并将数据的第一部分通过总线传送到视频存储器 其中主机微处理器可用于执行其他任务。 当适配器微处理器将数据从第一缓冲器部分传送到视频存储器时,主机微处理器用更多数据填充第一缓冲器部分,而适配器微处理器从第二缓冲器部分检索数据。 此过程将一直持续到所有数据传输完毕。
    • 3. 发明授权
    • System for locking down part of portion of memory and updating page
directory with entry corresponding to part of portion of the memory
locked down
    • 用于锁定部分内存的系统,并更新页面目录,其中对应于部分内存锁定的部分
    • US5675762A
    • 1997-10-07
    • US369330
    • 1995-01-06
    • William Kress BodinDavid Michael HydeTatchi Placido LayJames WilkinsonSusan Yee
    • William Kress BodinDavid Michael HydeTatchi Placido LayJames WilkinsonSusan Yee
    • G06F12/10
    • G06F12/1081
    • A method and apparatus are disclosed for providing exchange of data between a peripheral device having a paging mechanism and an application operating in a virtual machine which includes a page directory for exclusive use by the paging mechanism of the peripheral device. The virtual machine is running on a data processing system and preferably contains a block of memory which is divided into various sections of memory. The page directory is provided to the paging mechanism of the peripheral device when the application requires the use of the peripheral device. A section of memory is selectively locked down in response to the section of memory being utilized by the application. Additionally, the page directory is updated with an entry which identifies the section of memory that is locked down. Memory may also be locked down in order to permit the peripheral device to access that section of memory. The page directory is selectively updated thereafter by mapping entries into the page directory in order to track memory usage within the block of memory utilized by the virtual machine. The page directory is preferably created at the same time the virtual machine is created. Memory for utilization by the virtual machine is preferably locked down while the virtual machine is in the foreground. When the virtual machine is terminated or moved into the background, the sections of memory that have been locked down are then unlocked or freed for other use.
    • 公开了一种用于在具有寻呼机构的外围设备和在虚拟机中操作的应用程序之间提供数据交换的方法和装置,所述虚拟机包括由外围设备的寻呼机构专用的寻呼目录。 虚拟机在数据处理系统上运行,并且优选地包含被分成存储器的各个部分的存储器块。 当应用程序需要使用外围设备时,页面目录被提供给外围设备的寻呼机制。 响应于应用程序利用的存储器部分,存储器的一部分被选择性地锁定。 此外,页面目录更新为一个条目,标识被锁定的内存部分。 存储器也可能被锁定,以便允许外围设备访问该部分的存储器。 之后通过将条目映射到页目录中来选择性地更新页目录,以便跟踪由虚拟机使用的存储器块内的存储器使用。 页面目录优选地在创建虚拟机的同时创建。 优选地,在虚拟机处于前台时,由虚拟机利用的存储器被锁定。 当虚拟机终止或移动到后台时,锁定的内存部分然后被解锁或释放以供其他使用。