/* | |
* Copyright (c) 2015-2019 Cadence Design Systems, Inc. | |
* | |
* 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. | |
*/ | |
/* | |
* xtensa_overlay_os_hook.c -- Overlay manager OS hooks for FreeRTOS. | |
*/ | |
#include "FreeRTOS.h" | |
#include "semphr.h" | |
#if configUSE_MUTEX | |
/* Mutex object that controls access to the overlay. Currently only one | |
* overlay region is supported so one mutex suffices. | |
*/ | |
static SemaphoreHandle_t xt_overlay_mutex; | |
/* This function should be overridden to provide OS specific init such | |
* as the creation of a mutex lock that can be used for overlay locking. | |
* Typically this mutex would be set up with priority inheritance. See | |
* overlay manager documentation for more details. | |
*/ | |
void xt_overlay_init_os(void) | |
{ | |
/* Create the mutex for overlay access. Priority inheritance is | |
* required. | |
*/ | |
xt_overlay_mutex = xSemaphoreCreateMutex(); | |
} | |
/* This function locks access to shared overlay resources, typically | |
* by acquiring a mutex. | |
*/ | |
void xt_overlay_lock(void) | |
{ | |
xSemaphoreTake(xt_overlay_mutex, 0); | |
} | |
/* This function releases access to shared overlay resources, typically | |
* by unlocking a mutex. | |
*/ | |
void xt_overlay_unlock(void) | |
{ | |
xSemaphoreGive(xt_overlay_mutex); | |
} | |
#endif |