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#REDIRECT [[Graphics aperture remapping table]]
The '''graphics aperture remapping table''' ('''GART''')<ref>[http://support.amd.com/techdocs/25112.pdfSoftware Optimization Guide for AMD64 Processors]</ref> or '''AGP-GART''' when used with [[Accelerated Graphics Port]], sometimes known as the '''graphics translation table''' ('''GTT''')<ref>{{cite web|author=freedesktop.org|url=http://dri.freedesktop.org/wiki/GART|title=GART|accessdate=2010-03-05}}</ref>, and often misintepreted as '''graphics address remapping table''' is an [[IOMMU|I/O memory management unit]] (IOMMU) allowing the graphics card to perform a [[direct memory access]] (DMA) to the host system memory. Introduced by AMD for mapping of 32-bit AGP [[graphics card]]s accesses to the 64-bit memory space of the [[AMD64]] processors<ref>[https://pdfs.semanticscholar.org/60f1/35af3eb5253394f4ff944062a1b9e6a0c564.pdf Utilizing IOMMUs for Virtualization in Linux and Xen]</ref>, it was later reused for [[PCI Express]] (PCIe) as well.
GART is used as a means of data transfer between the [[primary storage|main memory]] and [[video memory]] through which buffers of [[texture mapping|textures]], [[polygon mesh]]es and other data are loaded, but can also be used to expand the amount of video memory available for graphics cards, particularly for cards with no dedicated video memory such as [[Intel HD Graphics]] processors.
==Operating system support==
=== Linux ===
Jeff Hartmann served as the primary maintainer of the [[Linux kernel]]'s agpgart driver, which began as part of [[Brian Paul]]'s [[Utah GLX]] accelerated [[Mesa 3D]] driver project. The developers primarily targeted Linux 2.4.x kernels, but made patches available against older 2.2.x kernels. Dave Jones heavily reworked agpgart for the Linux 2.6.x kernels, along with more contributions from Jeff Hartmann.<ref>{{cite web |url=http://www.linuxsymposium.org/archives/OLS/Reprints-2003/Reprint-Jones-OLS2003.pdf|title=Ugly Ducklings: Resurrecting unmaintained code – agpgart adapted for Linux 2.6 kernel |format=PDF |date=2003-07-24 |accessdate=2014-06-05 |archiveurl=https://web.archive.org/web/20140203111912/http://www.linuxsymposium.org/archives/OLS/Reprints-2003/Reprint-Jones-OLS2003.pdf |archivedate=2014-02-03 |last=Jones |first=Dave}}</ref>
=== FreeBSD ===
In [[FreeBSD]], the agpgart driver appeared in its 4.1 release.<ref>{{cite web|url=http://www.freebsd.org/cgi/man.cgi?agpgart |title=agp(4) |work=FreeBSD Man Pages: FreeBSD Kernel Interfaces Manual |publisher=freebsd.org |date=2007-11-28 |accessdate=2014-06-10}}</ref>
=== Solaris ===
AGPgart support was introduced into [[SXDE|Solaris Express Developer Edition]] as of its 7/05 release.<ref>{{cite web
|url = http://docs.sun.com/app/docs/doc/819-2254/agpgart-io-7i
|title = agpgart_io manpage
|accessdate = 2007-12-04
|work = docs.sun.com
|publisher = [[Sun Microsystems]]
}}</ref>
== See also ==
* [[Direct Rendering Manager]]
== References ==
{{Reflist}}
[[Category:Graphics hardware]]
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