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95 lines
2.3 KiB
C
95 lines
2.3 KiB
C
/*
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* Portable interface to the CPU cycle counter
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*
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* SPDX-FileCopyrightText: The Mbed TLS Contributors
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* SPDX-FileContributor: 2016-2022 Espressif Systems (Shanghai) CO LTD
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*/
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/*
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* mbedtls_timing_get_timer()m mbedtls_timing_set_delay() and
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* mbedtls_timing_set_delay only abstracted from mbedtls/library/timing.c
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* as that does not build on ESP-IDF but these 2 functions are needed for
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* DTLS (in particular mbedtls_ssl_set_timer_cb() must be called for DTLS
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* which requires these 2 delay functions).
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*/
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#include <mbedtls/build_info.h>
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#if !defined(MBEDTLS_ESP_TIMING_C)
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#include <sys/time.h>
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#include "mbedtls/timing.h"
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struct _hr_time
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{
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struct timeval start;
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};
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unsigned long mbedtls_timing_get_timer( struct mbedtls_timing_hr_time *val, int reset )
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{
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struct _hr_time *t = (struct _hr_time *) val;
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if( reset )
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{
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gettimeofday( &t->start, NULL );
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return( 0 );
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}
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else
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{
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unsigned long delta;
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struct timeval now;
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gettimeofday( &now, NULL );
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delta = ( now.tv_sec - t->start.tv_sec ) * 1000ul
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+ ( now.tv_usec - t->start.tv_usec ) / 1000;
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return( delta );
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}
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}
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/*
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* Set delays to watch
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*/
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void mbedtls_timing_set_delay( void *data, uint32_t int_ms, uint32_t fin_ms )
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{
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mbedtls_timing_delay_context *ctx = (mbedtls_timing_delay_context *) data;
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ctx->MBEDTLS_PRIVATE(int_ms) = int_ms;
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ctx->MBEDTLS_PRIVATE(fin_ms) = fin_ms;
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if( fin_ms != 0 )
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(void) mbedtls_timing_get_timer( &ctx->MBEDTLS_PRIVATE(timer), 1 );
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}
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/*
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* Get number of delays expired
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*/
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int mbedtls_timing_get_delay( void *data )
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{
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mbedtls_timing_delay_context *ctx = (mbedtls_timing_delay_context *) data;
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unsigned long elapsed_ms;
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if( ctx->MBEDTLS_PRIVATE(fin_ms) == 0 )
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return( -1 );
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elapsed_ms = mbedtls_timing_get_timer( &ctx->MBEDTLS_PRIVATE(timer), 0 );
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if( elapsed_ms >= ctx->MBEDTLS_PRIVATE(fin_ms) )
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return( 2 );
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if( elapsed_ms >= ctx->MBEDTLS_PRIVATE(int_ms) )
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return( 1 );
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return( 0 );
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}
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/*
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* Get the final delay.
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*/
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uint32_t mbedtls_timing_get_final_delay( const mbedtls_timing_delay_context *data )
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{
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return( data->MBEDTLS_PRIVATE(fin_ms) );
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}
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#endif /* MBEDTLS_ESP_TIMING_C */
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