142 lines
3.7 KiB
C
142 lines
3.7 KiB
C
/**
|
|
* \file timing.h
|
|
*
|
|
* \brief Portable interface to the CPU cycle counter
|
|
*
|
|
* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License"); you may
|
|
* not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*
|
|
* This file is part of mbed TLS (https://tls.mbed.org)
|
|
*/
|
|
#ifndef MBEDTLS_TIMING_H
|
|
#define MBEDTLS_TIMING_H
|
|
|
|
#if !defined(MBEDTLS_CONFIG_FILE)
|
|
#include "config.h"
|
|
#else
|
|
#include MBEDTLS_CONFIG_FILE
|
|
#endif
|
|
|
|
#if !defined(MBEDTLS_TIMING_ALT)
|
|
// Regular implementation
|
|
//
|
|
|
|
#include <stdint.h>
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
/**
|
|
* \brief timer structure
|
|
*/
|
|
struct mbedtls_timing_hr_time
|
|
{
|
|
unsigned char opaque[32];
|
|
};
|
|
|
|
/**
|
|
* \brief Context for mbedtls_timing_set/get_delay()
|
|
*/
|
|
typedef struct
|
|
{
|
|
struct mbedtls_timing_hr_time timer;
|
|
uint32_t int_ms;
|
|
uint32_t fin_ms;
|
|
} mbedtls_timing_delay_context;
|
|
|
|
extern volatile int mbedtls_timing_alarmed;
|
|
|
|
/**
|
|
* \brief Return the CPU cycle counter value
|
|
*
|
|
* \warning This is only a best effort! Do not rely on this!
|
|
* In particular, it is known to be unreliable on virtual
|
|
* machines.
|
|
*/
|
|
unsigned long mbedtls_timing_hardclock( void );
|
|
|
|
/**
|
|
* \brief Return the elapsed time in milliseconds
|
|
*
|
|
* \param val points to a timer structure
|
|
* \param reset if set to 1, the timer is restarted
|
|
*/
|
|
unsigned long mbedtls_timing_get_timer( struct mbedtls_timing_hr_time *val, int reset );
|
|
|
|
/**
|
|
* \brief Setup an alarm clock
|
|
*
|
|
* \param seconds delay before the "mbedtls_timing_alarmed" flag is set
|
|
*
|
|
* \warning Only one alarm at a time is supported. In a threaded
|
|
* context, this means one for the whole process, not one per
|
|
* thread.
|
|
*/
|
|
void mbedtls_set_alarm( int seconds );
|
|
|
|
/**
|
|
* \brief Set a pair of delays to watch
|
|
* (See \c mbedtls_timing_get_delay().)
|
|
*
|
|
* \param data Pointer to timing data
|
|
* Must point to a valid \c mbedtls_timing_delay_context struct.
|
|
* \param int_ms First (intermediate) delay in milliseconds.
|
|
* \param fin_ms Second (final) delay in milliseconds.
|
|
* Pass 0 to cancel the current delay.
|
|
*/
|
|
void mbedtls_timing_set_delay( void *data, uint32_t int_ms, uint32_t fin_ms );
|
|
|
|
/**
|
|
* \brief Get the status of delays
|
|
* (Memory helper: number of delays passed.)
|
|
*
|
|
* \param data Pointer to timing data
|
|
* Must point to a valid \c mbedtls_timing_delay_context struct.
|
|
*
|
|
* \return -1 if cancelled (fin_ms = 0)
|
|
* 0 if none of the delays are passed,
|
|
* 1 if only the intermediate delay is passed,
|
|
* 2 if the final delay is passed.
|
|
*/
|
|
int mbedtls_timing_get_delay( void *data );
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#else /* MBEDTLS_TIMING_ALT */
|
|
#include "timing_alt.h"
|
|
#endif /* MBEDTLS_TIMING_ALT */
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_SELF_TEST)
|
|
/**
|
|
* \brief Checkup routine
|
|
*
|
|
* \return 0 if successful, or 1 if a test failed
|
|
*/
|
|
int mbedtls_timing_self_test( int verbose );
|
|
#endif
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* timing.h */
|