Invention Grant
US07937555B2 Data processing system and computer program product to allow PCI host bridge (PHB) to handle pre-fetch read transactions on the PCI bus which access system memory through translation control entry (TCE) table
失效
数据处理系统和计算机程序产品，允许PCI主机桥（PHB）处理PCI总线上的预取读取事务，通过转换控制条目（TCE）表访问系统内存
- Patent Title: Data processing system and computer program product to allow PCI host bridge (PHB) to handle pre-fetch read transactions on the PCI bus which access system memory through translation control entry (TCE) table
- Patent Title (中): 数据处理系统和计算机程序产品，允许PCI主机桥（PHB）处理PCI总线上的预取读取事务，通过转换控制条目（TCE）表访问系统内存
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Application No.: US12105113Application Date: 2008-04-17
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Publication No.: US07937555B2Publication Date: 2011-05-03
- Inventor: Van Hoa Lee
- Applicant: Van Hoa Lee
- Applicant Address: US NY Armonk
- Assignee: International Business Machines Corporation
- Current Assignee: International Business Machines Corporation
- Current Assignee Address: US NY Armonk
- Agency: Yee & Associates, P.C.
- Agent Matthew W. Baca
- Main IPC: G06F12/00
- IPC: G06F12/00
Abstract:
A method, system, and computer instructions for providing valid translation entries in the TCE table for all supported DMA addresses to prevent the occurrence of system errors due to prefetching. A page is reserved in system memory. This reserved page is made unavailable to the operating system and may not be utilized by any software in the system. The reserved page is also written with all bytes set to 0xFF. The system firmware then selects a region in system memory for the TCE table. The TCE table is initialized, with all entries within the TCE table initialized to be valid and contain the corresponding address of the reserved page.
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