仅 8670 行代码，Linux 内核第一版 (v0.01) 开源代码解读

转自：OSC开源社区（ID：oschina2013)

• v0.01 总共包含 66 个 system call，如下：

  access acct alarm break brk chdir chmod
  chown chroot close creat dup dup2 execve
  exit fcntl fork fstat ftime getegid geteuid
  getgid getpgrp setsid getpid getppid
  getuid gtty ioctl kill link lock lseek
  mkdir mknod mount mpx nice open pause
  phys pipe prof ptrace read rename rmdir
  setgid setpgid setuid setup signal stat
  stime stty sync time times ulimit umask
  umount uname unlink ustat utime waitpid write

• 针对 i386 进行了深度硬编码

• Linux 内核最初的名字为 "FREAX"

  # Makefile for the FREAX-kernel. 

• 5 行代码实现 Kernel panic

  volatile void panic(const char * s)
  {
  printk("Kernel panic: %s\n\r",s);
  for(;;);
  }

• Linus 当时没有 8MB RAM 的机器

   * For those with more memory than 8 Mb - tough luck. I've
   * not got it, why should you :-) The source is here. Change
   * it. (Seriously - it shouldn't be too difficult. ...

Linux v0.01 源代码下载：https://cdn.kernel.org/pub/linux/kernel/Historic/linux-0.01.tar.gz