Invention Grant
- Patent Title: Timer access from user mode through a shared memory page
- Patent Title (中): 定时器从用户模式访问共享内存页面
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Application No.: US12414374Application Date: 2009-03-30
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Publication No.: US08392917B2Publication Date: 2013-03-05
- Inventor: Shuvabrata Ganguly , Jason S. Wohlgemuth , Allen Marshall
- Applicant: Shuvabrata Ganguly , Jason S. Wohlgemuth , Allen Marshall
- Applicant Address: US WA Redmond
- Assignee: Microsoft Corporation
- Current Assignee: Microsoft Corporation
- Current Assignee Address: US WA Redmond
- Main IPC: G06F9/455
- IPC: G06F9/455 ; G06F9/46

Abstract:
A computing system in which a software component executing on a platform can reliably and efficiently obtain state information about a component supported by the platform through the use of a shared memory page. State information may be supplied by the platform, but any state translation information needed to map the state information as supplied to a format as used may be provided through the shared page. In a virtualized environment, the state translation information can be used to map the value of a virtual timer counter or other component from a value provided by a virtual processor to a normalized reference time that will yield the same result, regardless of whether the software component is migrated to or from another virtual processor. Use of a shared page avoids the inefficiency of an intercept into a virtualized environment or a system calls in native mode operation.
Public/Granted literature
- US20100251235A1 TIMER ACCESS FROM USER MODE THROUGH A SHARED MEMORY PAGE Public/Granted day:2010-09-30
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