《操作系统》的实验代码。
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  1. #ifndef __KERN_DRIVER_CLOCK_H__
  2. #define __KERN_DRIVER_CLOCK_H__
  3. #include <defs.h>
  4. extern volatile size_t ticks;
  5. void clock_init(void);
  6. #endif /* !__KERN_DRIVER_CLOCK_H__ */