Invention Grant
US08346994B2 Methods and apparatus for providing user level DMA and memory access management
有权
提供用户级DMA和内存访问管理的方法和设备
- Patent Title: Methods and apparatus for providing user level DMA and memory access management
- Patent Title (中): 提供用户级DMA和内存访问管理的方法和设备
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Application No.: US12631207Application Date: 2009-12-04
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Publication No.: US08346994B2Publication Date: 2013-01-01
- Inventor: Katsushi Otsuka
- Applicant: Katsushi Otsuka
- Applicant Address: JP Tokyo
- Assignee: Sony Computer Entertainment Inc.
- Current Assignee: Sony Computer Entertainment Inc.
- Current Assignee Address: JP Tokyo
- Agency: Gibson & Dernier LLP
- Agent Matthew B. Dernier, Esq.
- Priority: JP2008-328251 20081224
- Main IPC: G06F13/28
- IPC: G06F13/28
Abstract:
A memory access control apparatus receives from a DMA requestor an access request command, which contains an IOID, for a DMA address space that is a memory area used for a DMA transfer, and determines whether the access is permitted or not and executes the access if it is permitted. The operating system on the PU sets in MMU the correspondence relationship between the logical address space of a user process and the DMA address space. When the user process instructs to access the DMA address space by specifying a logical address, the MMU translates the logical address into a physical address of the DMA address space.
Public/Granted literature
- US20100161850A1 Methods And Apparatus For Providing User Level DMA And Memory Access Management Public/Granted day:2010-06-24
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