ASM and Process 杂项

1. use helppc to check the assemble instructions.

2. 内核调度代码linux/kernel/sched.c

3. linux jiffies include/linux/jiffies.h

4. 微内核（Microkernel kernel） VS 单内核（Monolithic kernel）

5. 可编程间隔定时器 PIT 8253/8254 http://lxr.linux.no/#linux+v2.6.32/arch/mips/kernel/i8253.c

6. udelay

  40void
  41udelay(unsigned long usecs)
  42{
  43        usecs *= (((unsigned long)HZ << 32) / 1000000) * LPJ;
  44        __delay((long)usecs >> 32);
  45}
  46EXPORT_SYMBOL(udelay);
  47
  48void
  49ndelay(unsigned long nsecs)
  50{
  51        nsecs *= (((unsigned long)HZ << 32) / 1000000000) * LPJ;
  52        __delay((long)nsecs >> 32);
  53}
7. 键盘 i8042与i8048键盘控制器芯片端口操作总结 http://hi.baidu.com/elevin/blog/item/ce99cd2af471b024d42af1f6.html