| ************************************************************ |
| * For the very latest on DRI development, please see: * |
| * http://dri.freedesktop.org/ * |
| ************************************************************ |
| |
| The Direct Rendering Manager (drm) is a device-independent kernel-level |
| device driver that provides support for the XFree86 Direct Rendering |
| Infrastructure (DRI). |
| |
| The DRM supports the Direct Rendering Infrastructure (DRI) in four major |
| ways: |
| |
| 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. |