/* xtensa_overlay_os_hook.c -- Overlay manager OS hooks for FreeRTOS. */ | |
/* Copyright (c) 2015-2015 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. */ | |
#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 /* if configUSE_MUTEX */ |