1 /*
2  * FreeRTOS Kernel V11.0.1
3  * Copyright (C) 2015-2019 Cadence Design Systems, Inc.
4  * Copyright (C) 2021 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
5  *
6  * SPDX-License-Identifier: MIT
7  *
8  * Permission is hereby granted, free of charge, to any person obtaining a copy of
9  * this software and associated documentation files (the "Software"), to deal in
10  * the Software without restriction, including without limitation the rights to
11  * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
12  * the Software, and to permit persons to whom the Software is furnished to do so,
13  * subject to the following conditions:
14  *
15  * The above copyright notice and this permission notice shall be included in all
16  * copies or substantial portions of the Software.
17  *
18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
20  * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
21  * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
22  * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
23  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
24  *
25  * https://www.FreeRTOS.org
26  * https://github.com/FreeRTOS
27  *
28  */
29 
30 /*
31  * XTENSA INITIALIZATION ROUTINES CODED IN C
32  *
33  * This file contains miscellaneous Xtensa RTOS-generic initialization functions
34  * that are implemented in C.
35  */
36 
37 
38 #ifdef XT_BOARD
39     #include    <xtensa/xtbsp.h>
40 #endif
41 
42 #include    "xtensa_rtos.h"
43 
44 #ifdef XT_RTOS_TIMER_INT
45 
46     unsigned _xt_tick_divisor = 0; /* cached number of cycles per tick */
47 
48 /*
49  * Compute and initialize at run-time the tick divisor (the number of
50  * processor clock cycles in an RTOS tick, used to set the tick timer).
51  * Called when the processor clock frequency is not known at compile-time.
52  */
_xt_tick_divisor_init(void)53     void _xt_tick_divisor_init( void )
54     {
55         #ifdef XT_CLOCK_FREQ
56             _xt_tick_divisor = ( XT_CLOCK_FREQ / XT_TICK_PER_SEC );
57         #else
58             #ifdef XT_BOARD
59                 _xt_tick_divisor = xtbsp_clock_freq_hz() / XT_TICK_PER_SEC;
60             #else
61             #error "No way to obtain processor clock frequency"
62             #endif /* XT_BOARD */
63         #endif /* XT_CLOCK_FREQ */
64     }
65 
66 #endif /* XT_RTOS_TIMER_INT */
67