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#define TIME_AFTER(a,b)         ((long)(b) - (long)(a) < 0)
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#define TIME_AFTER(a,b)         ((long)(b) - (long)(a) < 0)
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#define TIME_BEFORE(a,b)        TIME_AFTER(b,a)
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#define TIME_BEFORE(a,b)        TIME_AFTER(b,a)
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#define TIMEOUT_EXPIRED(a,b)    TIME_AFTER(USEC_TIMER,a + b)
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#define TIMEOUT_EXPIRED(a,b)    TIME_AFTER(USEC_TIMER,a + b)
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uint64_t read_native_timer();
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#define NATIVE_TIMER (read_native_timer())
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uint32_t read_usec_timer();
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uint32_t read_usec_timer();
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#define USEC_TIMER (read_usec_timer())
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#define USEC_TIMER (read_usec_timer())
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static inline void udelay(long duration)  /* in usec steps */
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static inline void udelay(long duration)  /* in usec steps */