sys_clock.h

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/*
 * Copyright (c) 2014-2015 Wind River Systems, Inc.
 *
 * SPDX-License-Identifier: Apache-2.0
 */
 
#ifndef ZEPHYR_INCLUDE_SYS_CLOCK_H_
#define ZEPHYR_INCLUDE_SYS_CLOCK_H_
 
#include <sys/util.h>
#include <sys/dlist.h>
 
#include <toolchain.h>
#include <zephyr/types.h>
 
#include <sys/time_units.h>
 
#ifdef __cplusplus
extern "C" {
#endif
 
#ifdef CONFIG_TIMEOUT_64BIT
typedef int64_t k_ticks_t;
#else
typedef uint32_t k_ticks_t;
#endif
 
#define K_TICKS_FOREVER ((k_ticks_t) -1)
 
typedef struct {
        k_ticks_t ticks;
} k_timeout_t;
 
#define K_TIMEOUT_EQ(a, b) ((a).ticks == (b).ticks)
 
#define Z_TIMEOUT_NO_WAIT ((k_timeout_t) {})
#if defined(__cplusplus) && ((__cplusplus - 0) < 202002L)
#define Z_TIMEOUT_TICKS(t) ((k_timeout_t) { (t) })
#else
#define Z_TIMEOUT_TICKS(t) ((k_timeout_t) { .ticks = (t) })
#endif
#define Z_FOREVER Z_TIMEOUT_TICKS(K_TICKS_FOREVER)
 
#ifdef CONFIG_TIMEOUT_64BIT
# define Z_TIMEOUT_MS(t) Z_TIMEOUT_TICKS((k_ticks_t)k_ms_to_ticks_ceil64(MAX(t, 0)))
# define Z_TIMEOUT_US(t) Z_TIMEOUT_TICKS((k_ticks_t)k_us_to_ticks_ceil64(MAX(t, 0)))
# define Z_TIMEOUT_NS(t) Z_TIMEOUT_TICKS((k_ticks_t)k_ns_to_ticks_ceil64(MAX(t, 0)))
# define Z_TIMEOUT_CYC(t) Z_TIMEOUT_TICKS((k_ticks_t)k_cyc_to_ticks_ceil64(MAX(t, 0)))
#else
# define Z_TIMEOUT_MS(t) Z_TIMEOUT_TICKS((k_ticks_t)k_ms_to_ticks_ceil32(MAX(t, 0)))
# define Z_TIMEOUT_US(t) Z_TIMEOUT_TICKS((k_ticks_t)k_us_to_ticks_ceil32(MAX(t, 0)))
# define Z_TIMEOUT_NS(t) Z_TIMEOUT_TICKS((k_ticks_t)k_ns_to_ticks_ceil32(MAX(t, 0)))
# define Z_TIMEOUT_CYC(t) Z_TIMEOUT_TICKS((k_ticks_t)k_cyc_to_ticks_ceil32(MAX(t, 0)))
#endif
 
/* Converts between absolute timeout expiration values (packed into
 * the negative space below K_TICKS_FOREVER) and (non-negative) delta
 * timeout values.  If the result of Z_TICK_ABS(t) is >= 0, then the
 * value was an absolute timeout with the returend expiration time.
 * Note that this macro is bidirectional: Z_TICK_ABS(Z_TICK_ABS(t)) ==
 * t for all inputs, and that the representation of K_TICKS_FOREVER is
 * the same value in both spaces!  Clever, huh?
 */
#define Z_TICK_ABS(t) (K_TICKS_FOREVER - 1 - (t))
 
#ifdef CONFIG_TICKLESS_KERNEL
extern void z_enable_sys_clock(void);
#endif
 
#if defined(CONFIG_SYS_CLOCK_EXISTS) && \
        (CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC == 0)
#error "SYS_CLOCK_HW_CYCLES_PER_SEC must be non-zero!"
#endif
 
/* number of nsec per usec */
#define NSEC_PER_USEC 1000U
 
/* number of microseconds per millisecond */
#define USEC_PER_MSEC 1000U
 
/* number of milliseconds per second */
#define MSEC_PER_SEC 1000U
 
/* number of microseconds per second */
#define USEC_PER_SEC ((USEC_PER_MSEC) * (MSEC_PER_SEC))
 
/* number of nanoseconds per second */
#define NSEC_PER_SEC ((NSEC_PER_USEC) * (USEC_PER_MSEC) * (MSEC_PER_SEC))
 
 
/* kernel clocks */
 
/*
 * We default to using 64-bit intermediates in timescale conversions,
 * but if the HW timer cycles/sec, ticks/sec and ms/sec are all known
 * to be nicely related, then we can cheat with 32 bits instead.
 */
 
#ifdef CONFIG_SYS_CLOCK_EXISTS
 
#if defined(CONFIG_TIMER_READS_ITS_FREQUENCY_AT_RUNTIME) || \
        (MSEC_PER_SEC % CONFIG_SYS_CLOCK_TICKS_PER_SEC) || \
        (CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC % CONFIG_SYS_CLOCK_TICKS_PER_SEC)
#define _NEED_PRECISE_TICK_MS_CONVERSION
#endif
 
#endif
 
/* added tick needed to account for tick in progress */
#define _TICK_ALIGN 1
 
/*
 * SYS_CLOCK_HW_CYCLES_TO_NS_AVG converts CPU clock cycles to nanoseconds
 * and calculates the average cycle time
 */
#define SYS_CLOCK_HW_CYCLES_TO_NS_AVG(X, NCYCLES) \
        (uint32_t)(k_cyc_to_ns_floor64(X) / NCYCLES)
 
uint32_t sys_clock_tick_get_32(void);
 
int64_t sys_clock_tick_get(void);
 
#ifndef CONFIG_SYS_CLOCK_EXISTS
#define sys_clock_tick_get() (0)
#define sys_clock_tick_get_32() (0)
#endif
 
uint64_t sys_clock_timeout_end_calc(k_timeout_t timeout);
 
#ifdef __cplusplus
}
#endif
 
#endif /* ZEPHYR_INCLUDE_SYS_CLOCK_H_ */