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1. 发明申请

US20090292899A1 Data processing apparatus and method for handling address translation for access requests issued by processing circuitry 有权
标题翻译：用于处理由处理电路发出的访问请求的地址转换的数据处理装置和方法
公开(公告)号：US20090292899A1
公开(公告)日：2009-11-26
申请号：US12153617
申请日：2008-05-21
申请人： David Hennah MANSELL , Richard Roy GRISENTHWAITE
发明人： David Hennah MANSELL , Richard Roy GRISENTHWAITE
IPC分类号： G06F12/10
CPC分类号： G06F12/1009 , G06F12/1036
摘要： A data processing apparatus has address translation circuitry which is responsive to an access request specifying a virtual address, to perform a multi-stage address translation process to produce, via at least one intermediate address, a physical address in memory corresponding to the virtual address. The address translation circuitry references a storage unit, with each entry of the storage unit storing address translation information for one or more virtual addresses. Each entry has a field indicating whether the address translation information is consolidated address translation information or partial address translation information. If when processing an access request, it is determined that the relevant entry in the storage unit provides consolidated address translation information, the address translation circuitry produces a physical address directly from the consolidated address translation information. If on the other hand the relevant entry stores partial address translation information, the address translation circuitry produces an intermediate address from the partial address translation information and then performs the remainder of the multi-stage address translation process. Such an approach provides the performance benefits associated with a consolidated entry mechanism within the storage unit, whilst also allowing certain problem cases to be handled correctly and in an efficient manner.
摘要翻译：数据处理装置具有响应于指定虚拟地址的访问请求的地址转换电路，以执行多级地址转换处理，以通过至少一个中间地址产生与虚拟地址相对应的存储器中的物理地址。地址转换电路参考存储单元，存储单元的每个条目存储一个或多个虚拟地址的地址转换信息。每个条目具有指示地址转换信息是合并地址转换信息还是部分地址转换信息的字段。如果当处理访问请求时，确定存储单元中的相关条目提供合并的地址转换信息，地址转换电路直接从合并地址转换信息产生物理地址。如果相关条目存储部分地址转换信息，则地址转换电路从部分地址转换信息产生中间地址，然后执行多级地址转换处理的剩余部分。这种方法提供了与存储单元内的综合进入机制相关联的性能优点，同时还允许以正确和有效的方式处理某些问题情况。

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