1************************************************************ 2* For the very latest on DRI development, please see: * 3* http://dri.freedesktop.org/ * 4************************************************************ 5 6The Direct Rendering Manager (drm) is a device-independent kernel-level 7device driver that provides support for the XFree86 Direct Rendering 8Infrastructure (DRI). 9 10The DRM supports the Direct Rendering Infrastructure (DRI) in four major 11ways: 12 13 1. The DRM provides synchronized access to the graphics hardware via 14 the use of an optimized two-tiered lock. 15 16 2. The DRM enforces the DRI security policy for access to the graphics 17 hardware by only allowing authenticated X11 clients access to 18 restricted regions of memory. 19 20 3. The DRM provides a generic DMA engine, complete with multiple 21 queues and the ability to detect the need for an OpenGL context 22 switch. 23 24 4. The DRM is extensible via the use of small device-specific modules 25 that rely extensively on the API exported by the DRM module. 26 27 28Documentation on the DRI is available from: 29 http://dri.freedesktop.org/wiki/Documentation 30 http://sourceforge.net/project/showfiles.php?group_id=387 31 http://dri.sourceforge.net/doc/ 32 33For specific information about kernel-level support, see: 34 35 The Direct Rendering Manager, Kernel Support for the Direct Rendering 36 Infrastructure 37 http://dri.sourceforge.net/doc/drm_low_level.html 38 39 Hardware Locking for the Direct Rendering Infrastructure 40 http://dri.sourceforge.net/doc/hardware_locking_low_level.html 41 42 A Security Analysis of the Direct Rendering Infrastructure 43 http://dri.sourceforge.net/doc/security_low_level.html 44