Linux kernel device driver address mapping notes
#include <asm/io.h>
#define ioremap(cookie,size) __arm_ioremap(cookie, size, MT_DEVICE)
//cookie indicates the physical address, size indicates the mapping size. ioremap maps the specified physical address to an idle virtual address void __iomem *
__arm_ioremap(unsigned long phys_addr, size_t size, unsigned int mtype)
{
return __arm_ioremap_caller(phys_addr, size, mtype,
__builtin_return_address(0));
}1. Virtual address after mapping from physical address
2. ioread8(address)/readb() ioread16(address)/readw() ioread32(address)/readl() iowrite8(value, address) / writeb iowrite16(value, address) / writew iowrite32(value, address) / writel #include <asm/sizes.h> SZ_4K SZ_1M Summarize The above is the full content of this article. I hope that the content of this article will have certain reference learning value for your study or work. Thank you for your support of 123WORDPRESS.COM. If you want to learn more about this, please check out the following links You may also be interested in:
|
<<: Tutorial on how to remotely connect to MySQL database under Linux system
>>: Example of downloading files with vue+django
Recommend
Example analysis of mysql non-primary key self-increment usage
This article uses an example to illustrate the us...
JavaScript flow control (loop)
Table of contents 1. for loop 2. Double for loop ...
Why is it not recommended to use index as key in react?
1. Compare the old virtual DOM with the new virtu...
Binary Type Operations in MySQL
This article mainly introduces the binary type op...
Security configuration and detection of SSL after the website enables https
It is standard for websites to enable SSL nowaday...
Pure CSS to achieve the water drop animation button in Material Design
Preface You should often see this kind of special...
Vue3.0 handwriting magnifying glass effect
The effect to be achieved is: fixed zoom in twice...
Summary of HTML Hack Tags in IE Browser
Copy code The code is as follows: <!--[if !IE]...
A brief discussion on the construction and operation mechanism of the real-time computing framework Flink cluster
Table of contents 1. Flink Overview 1.1 Basic Int...
MySQL 8.0.18 installation and configuration graphic tutorial
Learning objectives: Learn to use Windows system ...
How to get the size of a Linux system directory using the du command
Anyone who has used the Linux system should know ...
NULL and Empty String in Mysql
I recently came into contact with MySQL. Yesterda...
Implementation of services in docker accessing host services
Table of contents 1. Scenario 2. Solution 3. Conc...
Solve the problem of installing Theano on Ubuntu 19
Solution: Directly in the directory where you dow...
js to achieve simple front-end paging effect
Some projects have relatively simple business, bu...