Ø在 x86 系统中，将 1M 空间最上面的 0xF0000 到 0xFFFFF 这 64K 映射给 ROM。 Ø当电脑刚加电的时候，会做一些重置的工作，将 CS 设置为 0xFFFF，将 IP 设置为 0x0000，所以第一条指令就会指向 0xFFFF0，正是在 ROM 的范围内。 Ø在这里，有一个 JMP 命令会跳到 ROM 中做初始化 ...

内核启动的核心链路可概括为：引导加载程序（Bootloader）→ 加载内核映像 → 内核解压 → 内核启动 → 调用start_kernel函数 → 启动初始进程（Init Process） 1.1、启动加载程序 (Bootloader) 引导加载程序（常见的有GRUB、LILO、syslinux等）是连接硬件与内核的关键桥梁 ...

One of the most crucial pieces of any UNIX-like operating system is the init dæmon process. In Linux, this process is started by the kernel, and it's the first userspace process to spawn and the last ...

I love discovering new UNIX commands, especially those with a system administration flavor. When I learned Red Hat distributed the chkconfig utility, it brought back fond memories of chkconfig under ...

A lot of embedded systems are running Linux on platforms like Raspberry Pi. Since Linux is fully functional from a command line and fully network-capable, it is possible to run servers that you’ve ...

The Linux operating system is powerful and flexible, able to run in several different modes of operation called run levels. When a Linux system starts, a function called "init" is used to configure ...

A daemon is a process that runs in the background and is waiting for a specific event to occur. Typical daemons are httpd of web server and sshd which provides SSH connection. When booting is ...

The committee charged with solving technical disputes within the Debian project has finally completed a vote on what init system to use as the default in future Debian Linux distributions, selecting ...