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

  40
void

  41
udelay
(unsigned long usecs
)

  42
{

  43
        usecs
 *= (((unsigned long)HZ
 << 32) / 1000000) * LPJ
;

  44
        __delay
((long)usecs
 >> 32);

  45
}

  46
EXPORT_SYMBOL
(udelay
);

  47


  48
void

  49
ndelay
(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