************************************************************* For the very latest on DRI development, please see:      **     http://dri.freedesktop.org/                          ************************************************************* The Direct Rendering Manager (drm) is a device-independent kernel-leveldevice driver that provides support for the XFree86 Direct RenderingInfrastructure (DRI). The DRM supports the Direct Rendering Infrastructure (DRI) in four majorways:     1. The DRM provides synchronized access to the graphics hardware via       the use of an optimized two-tiered lock.     2. The DRM enforces the DRI security policy for access to the graphics       hardware by only allowing authenticated X11 clients access to       restricted regions of memory.     3. The DRM provides a generic DMA engine, complete with multiple       queues and the ability to detect the need for an OpenGL context       switch.     4. The DRM is extensible via the use of small device-specific modules       that rely extensively on the API exported by the DRM module.  Documentation on the DRI is available from:    http://dri.freedesktop.org/wiki/Documentation    http://sourceforge.net/project/showfiles.php?group_id=387    http://dri.sourceforge.net/doc/ For specific information about kernel-level support, see:     The Direct Rendering Manager, Kernel Support for the Direct Rendering    Infrastructure    http://dri.sourceforge.net/doc/drm_low_level.html     Hardware Locking for the Direct Rendering Infrastructure    http://dri.sourceforge.net/doc/hardware_locking_low_level.html     A Security Analysis of the Direct Rendering Infrastructure    http://dri.sourceforge.net/doc/security_low_level.html