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1. 发明授权

US5675762A 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 失效
标题翻译：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
公开(公告)号：US5675762A
公开(公告)日：1997-10-07
申请号：US369330
申请日：1995-01-06
申请人： William Kress Bodin , David Michael Hyde , Tatchi Placido Lay , James Wilkinson , Susan Yee
发明人： William Kress Bodin , David Michael Hyde , Tatchi Placido Lay , James Wilkinson , Susan Yee
IPC分类号： G06F12/10
CPC分类号： G06F12/1081
摘要： 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.
摘要翻译：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。

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