Page attribute table
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For other uses, see PAT (disambiguation).
The page attribute table (PAT) is a processor supplementary capability extension to the page table format of certain x86 and x86-64 microprocessors. Like memory type range registers (MTRRs), they allow for fine-grained control over how areas of memory are cached, and are a companion feature to the MTRRs.[1]
Unlike MTRRs, which provide the ability to manipulate the behavior of caching for a limited number of fixed physical address ranges, Page Attribute Tables allow for such behavior to be specified on a per-page basis, greatly increasing the ability of the operating system to select the most efficient behavior for any given task.[2]
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[edit] Processors
The PAT is available on Pentium III and newer CPUs, and on non-Intel CPUs.
[edit] See also
[edit] References
- ^ "Intel 64 and IA-32 Architectures Software Developer's Manual Volume 3A: System Programming Guide, Part 1". Intel. http://download.intel.com/design/processor/manuals/253668.pdf. Retrieved 2009-10-31.
- ^ "Documentation/x86/pat.txt". lwn.net. http://lwn.net/Articles/278994/. Retrieved 2011-01-02.
[edit] External links
- Intel 64 and IA-32 Architectures Software Developer's Manual Volume 3A: System Programming Guide, Part 1 see chapter 11, section 12.
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