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

  alarmbreak

  brk

  chdirchmod
  chownchrootclose

  creat dup dup2 execve

  
  exitfcntlfork

  fstat ftime getegid geteuid

  
  

  getgid

  getpgrp

  setsid getpid getppid

  
  

  getuid gtty ioctl

  killlink

  lock lseek

  
  mkdir

  mknod mount mpx nice

  open

  pause

  
  

  phys

  pipe

  prof ptrace

  readrenamermdir
  

  setgid setpgid setuid setup signal

  stat
  

  stime stty sync

  timetimes

  ulimit

  umask
  

  umount uname

  unlink

  ustat

  utimewaitpidwrite
• 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
  volatilevoidpanic(constchar * 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. ...