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/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2010-2014 Intel Corporation.
* Copyright(c) 2013 6WIND S.A.
*/
#ifndef _RTE_CYCLES_H_
#define _RTE_CYCLES_H_
/**
* @file
*
* Simple Time Reference Functions (Cycles and HPET).
*/
#include <stdint.h>
#include <rte_compat.h>
#include <rte_debug.h>
#include <rte_atomic.h>
#define MS_PER_S 1000
#define US_PER_S 1000000
#define NS_PER_S 1000000000
enum timer_source {
EAL_TIMER_TSC = 0,
EAL_TIMER_HPET
};
extern enum timer_source eal_timer_source;
/**
* Get the measured frequency of the RDTSC counter
*
* @return
* The TSC frequency for this lcore
*/
uint64_t
rte_get_tsc_hz(void);
/**
* Return the number of TSC cycles since boot
*
* @return
* the number of cycles
*/
static inline uint64_t
rte_get_tsc_cycles(void);
#ifdef RTE_LIBEAL_USE_HPET
/**
* Return the number of HPET cycles since boot
*
* This counter is global for all execution units. The number of
* cycles in one second can be retrieved using rte_get_hpet_hz().
*
* @return
* the number of cycles
*/
uint64_t
rte_get_hpet_cycles(void);
/**
* Get the number of HPET cycles in one second.
*
* @return
* The number of cycles in one second.
*/
uint64_t
rte_get_hpet_hz(void);
/**
* Initialise the HPET for use. This must be called before the rte_get_hpet_hz
* and rte_get_hpet_cycles APIs are called. If this function does not succeed,
* then the HPET functions are unavailable and should not be called.
*
* @param make_default
* If set, the hpet timer becomes the default timer whose values are
* returned by the rte_get_timer_hz/cycles API calls
*
* @return
* 0 on success,
* -1 on error, and the make_default parameter is ignored.
*/
int rte_eal_hpet_init(int make_default);
#endif
/**
* Get the number of cycles since boot from the default timer.
*
* @return
* The number of cycles
*/
static inline uint64_t
rte_get_timer_cycles(void)
{
#ifdef RTE_LIBEAL_USE_HPET
switch(eal_timer_source) {
case EAL_TIMER_TSC:
#endif
return rte_get_tsc_cycles();
#ifdef RTE_LIBEAL_USE_HPET
case EAL_TIMER_HPET:
return rte_get_hpet_cycles();
default: rte_panic("Invalid timer source specified\n");
}
#endif
}
/**
* Get the number of cycles in one second for the default timer.
*
* @return
* The number of cycles in one second.
*/
static inline uint64_t
rte_get_timer_hz(void)
{
#ifdef RTE_LIBEAL_USE_HPET
switch(eal_timer_source) {
case EAL_TIMER_TSC:
#endif
return rte_get_tsc_hz();
#ifdef RTE_LIBEAL_USE_HPET
case EAL_TIMER_HPET:
return rte_get_hpet_hz();
default: rte_panic("Invalid timer source specified\n");
}
#endif
}
/**
* Wait at least us microseconds.
* This function can be replaced with user-defined function.
* @see rte_delay_us_callback_register
*
* @param us
* The number of microseconds to wait.
*/
extern void
(*rte_delay_us)(unsigned int us);
/**
* Wait at least ms milliseconds.
*
* @param ms
* The number of milliseconds to wait.
*/
static inline void
rte_delay_ms(unsigned ms)
{
rte_delay_us(ms * 1000);
}
/**
* Blocking delay function.
*
* @param us
* Number of microseconds to wait.
*/
void rte_delay_us_block(unsigned int us);
/**
* Delay function that uses system sleep.
* Does not block the CPU core.
*
* @param us
* Number of microseconds to wait.
*/
void __rte_experimental
rte_delay_us_sleep(unsigned int us);
/**
* Replace rte_delay_us with user defined function.
*
* @param userfunc
* User function which replaces rte_delay_us. rte_delay_us_block restores
* buildin block delay function.
*/
void rte_delay_us_callback_register(void(*userfunc)(unsigned int));
#endif /* _RTE_CYCLES_H_ */
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