[转]IOVA- io virtual address

有点标题党的味道了~ 对于readl() 和 inl() 读取I/O端口报错的探究 给s3c6410的RTC写demo driver的时候遇到这个问题... 如图 这是虚拟内存技术导致的问题,不能直接使用物理地址(不过这里有个疑问,我上次给PC写的CMOS driver貌似用的是物理地址,布吉岛为嘛) 解决办法就是调用ioremap函数转换物理地址,重新映射IO端口到虚拟地址中 Once equipped with ioremap (and iounmap), a device driver c

http://thinkiii.blogspot.jp/2014/02/arm32-linux-kernel-virtual-address-space.html The 32-bit ARM CPU can address up to 2^32 = 4GB address*. It's not big enough in present days, since the size of available DRAM on computing devices is growing fast and

Memory Layout (Virtual address space of a C process) 分类: C语言基础2012-12-06 23:16 2174人阅读 评论(0) 收藏 举报 found a good example to demostrate the memory layout and its stack info of a user-mode process, only that this example is for Linux. But it is still wo

An embodiment provides a?virtual?address?cache?memory including: a TLB virtual?page memory configured to, when a rewrite to a TLB occurs, rewrite entry data; a data memory configured to hold?cache?data using a?virtual?page tag?or a page offset as a?c

kernel里调试时写alc5642时机器会时而重启,终于抓到了log,如下: Unable to handle kernel paging request at virtual address xxxx 网上一搜,如下: Restarting system. Unable to handle kernel paging request at virtual address b13bffe0 pgd = c9184000 [b13bffe0] *pgd=00000000 Internal err

在Linux中,给kernel传递参数以控制其行为总共有三种方法: 1.build kernel之时的各个configuration选项. 2.当kernel启动之时,可以参数在kernel被GRUB或LILO等启动程序调用之时传递给kernel. 3.在kernel运行时,修改/proc或/sys目录下的文件. 这里我简单讲的就是第二种方式了,kernel在grub中配置的启动参数. 首先,kernel有哪些参数呢? 在linux的源代码中,有这样的一个文档Documentation/kern

在Linux中,给kernel传递参数以控制其行为总共有三种方法: 1.build kernel之时的各个configuration选项. 2.当kernel启动之时,可以参数在kernel被GRUB或LILO等启动程序调用之时传递给kernel. 3.在kernel运行时,修改/proc或/sys目录下的文件. 这里我简单讲的就是第二种方式了,kernel在grub中配置的启动参数. 首先,kernel有哪些参数呢? 在linux的源代码中,有这样的一个文档Documentation/kern

BACKGROUND As processing resources have increased, demands to run multiple software programs and operating systems on a single microprocessor have also increased. To meet these demands virtual environments have been developed to allocate a single com

BACKGROUND A conventional virtual-machine monitor (VMM) typically runs on a computer and presents to other software the abstraction of one or more virtual machines. Each virtual machine may function as a self-contained platform, running its own "gues