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摘要: From: http://lwn.net/Articles/283798/NOTE: Currently the buffer creation/read/write are implemented by driver specified ioctls. So right now you can't find functions like "drm_gem_create" in kernel sources.And that's also why we need "dumb buffer" in drm's ioctls(dumb 阅读全文
posted @ 2012-06-29 10:37 super119 阅读(720) 评论(0) 推荐(0) 编辑
摘要: From: http://lwn.net/Articles/257417/The management of video hardware has long been an area of weakness in the Linux system (and free operating systems in general). The X Window System tends to get a lot of the blame for problems in this area, but the truth of the matter is that the problems are mor 阅读全文
posted @ 2012-06-29 10:27 super119 阅读(606) 评论(0) 推荐(0) 编辑
摘要: From: http://lwn.net/Articles/283793/Getting high-performance, three-dimensional graphics working under Linux is quite a challenge even when the fundamental hardware programming information is available. One component of this problem is memory management: a graphics processor (GPU) is, essentially, 阅读全文
posted @ 2012-06-29 10:07 super119 阅读(588) 评论(0) 推荐(0) 编辑
摘要: From: http://lwn.net/Articles/454389/CPUs may not have gotten hugely faster in recent years, but they have gained in other ways; a typical system-on-chip (SoC) device now has a number of peripherals which would qualify as reasonably powerful CPUs in their own right. More powerful devices with direct 阅读全文
posted @ 2012-06-28 18:10 super119 阅读(486) 评论(0) 推荐(0) 编辑
摘要: From: http://www.cnblogs.com/bravery/archive/2012/06/27/2560611.html概述 想必在linux上写过程序的同学都有分析进程占用多少内存的经历,或者被问到这样的问题——你的程序在运行时占用了多少内存(物理内存)?通常我们可以通过top命令查看进程占用了多少内存。这里我们可以看到VIRT、RES和SHR三个重要的指标,他们分别代表什么意思呢?这是本文需要跟大家一起探讨的问题。当然如果更加深入一点,你可能会问进程所占用的那些物理内存都用在了哪些地方?这时候top命令可能不能给到你你所想要的答案了,不过我们可以分析proc文件系统提供的s 阅读全文
posted @ 2012-06-28 09:10 super119 阅读(475) 评论(0) 推荐(0) 编辑
摘要: 转自:http://blog.csdn.net/thegameisfives/article/details/7308458什么是ION ?我的理解就是google在android4.0引入的一种内存管理器,来替代之前各个芯片厂家自己的方案..以下是网上找到的:it has become clear that PMEM is considered obsolete and will be replaced by the ION memory manager . ION is a generalized memory manager that Google introduced in the A 阅读全文
posted @ 2012-06-27 15:27 super119 阅读(893) 评论(0) 推荐(0) 编辑
摘要: 转自:http://blog.csdn.net/hello_wyq/article/details/13377541. 介绍:DDC 是显示器与电脑主机进行通信的一个总线标准,其全称是:DISPLAY DATA CHNNEL。它的基本功能就是将显示器的电子档案资料信息,诸如可接收行场频范围、生产厂商、生产日期、产品序列号、产品型号、标准显示模式及其参数、 所支持的DDC标准类别、EDID的版本信息等等。高版本的DDC标准总线还可以允许电脑主机直接调节显示器的基本参数,诸如亮度、对比度、行场幅度的大 小、行场中心位置、色温参数等等。2. DDC总线标准类别:1)DDC1:单向传输,CLOCKED 阅读全文
posted @ 2012-06-27 10:20 super119 阅读(1160) 评论(0) 推荐(0) 编辑
摘要: From: http://zhanglinbao.bokee.com/5408080.html 申明:这份文档是按照自由软件开放源代码的精神发布的,任何人可以免费获得、使用和重新发布,但是你没有限制别人重新发布你发布内容的权利。发布本文的目的是希望它能对读者有用,但没有任何担保,甚至没有适合特定目的的隐含的担保。更详细的情况请参阅GNU通用公共许可证(GPL),以及GNU自由文档协议(GFDL)。 几乎每一种外设都是通过读写设备上的寄存器来进行的。外设寄存器也称为“I/O端口”,通常包括:控制寄存器、状态寄存器和数据寄存器三大类,而且一个外设的寄存器通常被连续地编址。CPU对外设IO端口... 阅读全文
posted @ 2012-06-26 13:18 super119 阅读(283) 评论(0) 推荐(0) 编辑
摘要: From: http://www.x.org/wiki/Development/Documentation/HowVideoCardsWorkSo you want to know how modern video cards work. Here goes...Modern video cards usually have several common features:Video RamDisplay control2D engine3D engineOverlayHW sprites (cursor, icon, etc.)AGP/PCI/PCIEApertures (registers 阅读全文
posted @ 2012-06-21 15:08 super119 阅读(405) 评论(0) 推荐(0) 编辑
摘要: From: http://blog.csdn.net/do2jiang/article/details/5450839几乎每一种外设都是通过读写设备上的寄存器来进行的,通常包括控制寄存器、状态寄存器和数据寄存器三大类,外设的寄存器通常被连续地编址。根据CPU体系结构的不同,CPU对IO端口的编址方式有两种: (1)I/O映射方式(I/O-mapped) 典型地,如X86处理器为外设专门实现了一个单独的地址空间,称为"I/O地址空间"或者"I/O端口空间",CPU通过专门的I/O指令(如X86的IN和OUT指令)来访问这一空间中的地址单元。 (2)内存映射 阅读全文
posted @ 2012-06-21 13:22 super119 阅读(494) 评论(0) 推荐(0) 编辑
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