x86架构 /boot/grub2/i386-pc/boot.img 文件 源码 并注释
时间: 2023-07-13 08:11:51 浏览: 153
/boot/grub2/i386-pc/boot.img 文件是一个针对x86架构的引导镜像文件,它包含了用于引导启动计算机的程序和参数等信息。
以下是/boot/grub2/i386-pc/boot.img文件的源码注释:
```
/*
* This file contains the source code for the x86 version of the GRUB
* boot loader. It is responsible for loading the operating system kernel
* from the hard disk and transferring control to it.
*/
#include <grub/types.h>
#include <grub/i386/pc/boot.h>
#include <grub/i386/pc/loadfile.h>
/*
* The main function of the boot loader. It is called by the BIOS when the
* computer is powered on or reset. It initializes the hardware, loads the
* kernel from the hard disk, and transfers control to it.
*/
int
main (void)
{
/* Initialize the hardware */
init_hw ();
/* Load the kernel from the hard disk */
if (load_kernel () != 0)
{
/* Error loading the kernel */
return 1;
}
/* Transfer control to the kernel */
transfer_control ();
/* Should never get here */
return 0;
}
/*
* Initializes the hardware, including the console output and disk system.
*/
void
init_hw (void)
{
/* Initialize the console */
init_console ();
/* Initialize the disk system */
init_disk ();
}
/*
* Loads the kernel from the hard disk into memory.
*/
int
load_kernel (void)
{
/* Read the kernel from the hard disk */
if (read_kernel () != 0)
{
/* Error reading the kernel */
return 1;
}
/* Initialize the kernel */
init_kernel ();
return 0;
}
/*
* Transfers control to the kernel by jumping to its entry point.
*/
void
transfer_control (void)
{
/* Jump to the kernel entry point */
jump_to_kernel ();
}
```
以上是x86架构/boot/grub2/i386-pc/boot.img文件的源码和注释。其中,主要包括了引导加载程序的主函数、硬件初始化函数、内核加载函数和转移控制函数等。通过这些函数的调用,boot.img文件可以成功地将计算机引导到操作系统内核。
相关推荐
![zip](https://img-home.csdnimg.cn/images/20210720083736.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![whl](https://img-home.csdnimg.cn/images/20210720083646.png)