portable/ThirdParty/XCC/Xtensa/xtensa_init.c

/*
 * FreeRTOS Kernel <DEVELOPMENT BRANCH>
 * Copyright (C) 2015-2019 Cadence Design Systems, Inc.
 * Copyright (C) 2021 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
 *
 * SPDX-License-Identifier: MIT
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
 * the Software, and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 * https://www.FreeRTOS.org
 * https://github.com/FreeRTOS
 *
 */

/*
 * XTENSA INITIALIZATION ROUTINES CODED IN C
 *
 * This file contains miscellaneous Xtensa RTOS-generic initialization functions
 * that are implemented in C.
 */


#ifdef XT_BOARD
    #include    <xtensa/xtbsp.h>
#endif

#include    "xtensa_rtos.h"

#ifdef XT_RTOS_TIMER_INT

    unsigned _xt_tick_divisor = 0; /* cached number of cycles per tick */

/*
 * Compute and initialize at run-time the tick divisor (the number of
 * processor clock cycles in an RTOS tick, used to set the tick timer).
 * Called when the processor clock frequency is not known at compile-time.
 */
    void _xt_tick_divisor_init( void )
    {
        #ifdef XT_CLOCK_FREQ
            _xt_tick_divisor = ( XT_CLOCK_FREQ / XT_TICK_PER_SEC );
        #else
            #ifdef XT_BOARD
                _xt_tick_divisor = xtbsp_clock_freq_hz() / XT_TICK_PER_SEC;
            #else
            #error "No way to obtain processor clock frequency"
            #endif /* XT_BOARD */
        #endif /* XT_CLOCK_FREQ */
    }

#endif /* XT_RTOS_TIMER_INT */