| /* SPDX-License-Identifier: GPL-2.0+ */ |
| |
| #ifndef _TIME_H |
| #define _TIME_H |
| |
| #include <linux/typecheck.h> |
| #include <linux/types.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); |
| |
| /* |
| * timer_test_add_offset() |
| * |
| * Allow tests to add to the time reported through lib/time.c functions |
| * offset: number of milliseconds to advance the system time |
| */ |
| void timer_test_add_offset(unsigned long offset); |
| |
| /** |
| * usec_to_tick() - convert microseconds to clock ticks |
| * |
| * @usec: duration in microseconds |
| * Return: duration in clock ticks |
| */ |
| uint64_t usec_to_tick(unsigned long usec); |
| |
| /* |
| * 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 */ |