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- /* SPDX-License-Identifier: GPL-2.0+ */
- #ifndef _TIME_H
- #define _TIME_H
- #include <linux/typecheck.h>
- unsigned long get_timer(unsigned long base);
- /*
- * Return the current value of a monotonically increasing microsecond timer.
- * Granularity may be larger than 1us if hardware does not support this.
- */
- unsigned long timer_get_us(void);
- /*
- * These inlines deal with timer wrapping correctly. You are
- * strongly encouraged to use them
- * 1. Because people otherwise forget
- * 2. Because if the timer wrap changes in future you won't have to
- * alter your driver code.
- *
- * time_after(a,b) returns true if the time a is after time b.
- *
- * Do this with "<0" and ">=0" to only test the sign of the result. A
- * good compiler would generate better code (and a really good compiler
- * wouldn't care). Gcc is currently neither.
- */
- #define time_after(a,b) \
- (typecheck(unsigned long, a) && \
- typecheck(unsigned long, b) && \
- ((long)((b) - (a)) < 0))
- #define time_before(a,b) time_after(b,a)
- #define time_after_eq(a,b) \
- (typecheck(unsigned long, a) && \
- typecheck(unsigned long, b) && \
- ((long)((a) - (b)) >= 0))
- #define time_before_eq(a,b) time_after_eq(b,a)
- /*
- * Calculate whether a is in the range of [b, c].
- */
- #define time_in_range(a,b,c) \
- (time_after_eq(a,b) && \
- time_before_eq(a,c))
- /*
- * Calculate whether a is in the range of [b, c).
- */
- #define time_in_range_open(a,b,c) \
- (time_after_eq(a,b) && \
- time_before(a,c))
- #endif /* _TIME_H */
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