415 lines
12 KiB
C
415 lines
12 KiB
C
|
/*
|
||
|
|
* FreeRTOS Kernel V10.3.1
|
||
|
|
* Copyright (C) 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
|
||
|
|
*
|
||
|
|
* 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.
|
||
|
|
*
|
||
|
|
* http://www.FreeRTOS.org
|
||
|
|
* http://aws.amazon.com/freertos
|
||
|
|
*
|
||
|
|
* 1 tab == 4 spaces!
|
||
|
|
*/
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @file atomic.h
|
||
|
|
* @brief FreeRTOS atomic operation support.
|
||
|
|
*
|
||
|
|
* This file implements atomic functions by disabling interrupts globally.
|
||
|
|
* Implementations with architecture specific atomic instructions can be
|
||
|
|
* provided under each compiler directory.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef ATOMIC_H
|
||
|
|
#define ATOMIC_H
|
||
|
|
|
||
|
|
#ifndef INC_FREERTOS_H
|
||
|
|
#error "include FreeRTOS.h must appear in source files before include atomic.h"
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/* Standard includes. */
|
||
|
|
#include <stdint.h>
|
||
|
|
|
||
|
|
#ifdef __cplusplus
|
||
|
|
extern "C" {
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Port specific definitions -- entering/exiting critical section.
|
||
|
|
* Refer template -- ./lib/FreeRTOS/portable/Compiler/Arch/portmacro.h
|
||
|
|
*
|
||
|
|
* Every call to ATOMIC_EXIT_CRITICAL() must be closely paired with
|
||
|
|
* ATOMIC_ENTER_CRITICAL().
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
#if defined( portSET_INTERRUPT_MASK_FROM_ISR )
|
||
|
|
|
||
|
|
/* Nested interrupt scheme is supported in this port. */
|
||
|
|
#define ATOMIC_ENTER_CRITICAL() \
|
||
|
|
UBaseType_t uxCriticalSectionType = portSET_INTERRUPT_MASK_FROM_ISR()
|
||
|
|
|
||
|
|
#define ATOMIC_EXIT_CRITICAL() \
|
||
|
|
portCLEAR_INTERRUPT_MASK_FROM_ISR( uxCriticalSectionType )
|
||
|
|
|
||
|
|
#else
|
||
|
|
|
||
|
|
/* Nested interrupt scheme is NOT supported in this port. */
|
||
|
|
#define ATOMIC_ENTER_CRITICAL() portENTER_CRITICAL()
|
||
|
|
#define ATOMIC_EXIT_CRITICAL() portEXIT_CRITICAL()
|
||
|
|
|
||
|
|
#endif /* portSET_INTERRUPT_MASK_FROM_ISR() */
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Port specific definition -- "always inline".
|
||
|
|
* Inline is compiler specific, and may not always get inlined depending on your
|
||
|
|
* optimization level. Also, inline is considered as performance optimization
|
||
|
|
* for atomic. Thus, if portFORCE_INLINE is not provided by portmacro.h,
|
||
|
|
* instead of resulting error, simply define it away.
|
||
|
|
*/
|
||
|
|
#ifndef portFORCE_INLINE
|
||
|
|
#define portFORCE_INLINE
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#define ATOMIC_COMPARE_AND_SWAP_SUCCESS 0x1U /**< Compare and swap succeeded, swapped. */
|
||
|
|
#define ATOMIC_COMPARE_AND_SWAP_FAILURE 0x0U /**< Compare and swap failed, did not swap. */
|
||
|
|
|
||
|
|
/*----------------------------- Swap && CAS ------------------------------*/
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Atomic compare-and-swap
|
||
|
|
*
|
||
|
|
* @brief Performs an atomic compare-and-swap operation on the specified values.
|
||
|
|
*
|
||
|
|
* @param[in, out] pulDestination Pointer to memory location from where value is
|
||
|
|
* to be loaded and checked.
|
||
|
|
* @param[in] ulExchange If condition meets, write this value to memory.
|
||
|
|
* @param[in] ulComparand Swap condition.
|
||
|
|
*
|
||
|
|
* @return Unsigned integer of value 1 or 0. 1 for swapped, 0 for not swapped.
|
||
|
|
*
|
||
|
|
* @note This function only swaps *pulDestination with ulExchange, if previous
|
||
|
|
* *pulDestination value equals ulComparand.
|
||
|
|
*/
|
||
|
|
static portFORCE_INLINE uint32_t Atomic_CompareAndSwap_u32( uint32_t volatile * pulDestination,
|
||
|
|
uint32_t ulExchange,
|
||
|
|
uint32_t ulComparand )
|
||
|
|
{
|
||
|
|
uint32_t ulReturnValue;
|
||
|
|
|
||
|
|
ATOMIC_ENTER_CRITICAL();
|
||
|
|
{
|
||
|
|
if( *pulDestination == ulComparand )
|
||
|
|
{
|
||
|
|
*pulDestination = ulExchange;
|
||
|
|
ulReturnValue = ATOMIC_COMPARE_AND_SWAP_SUCCESS;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
ulReturnValue = ATOMIC_COMPARE_AND_SWAP_FAILURE;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
ATOMIC_EXIT_CRITICAL();
|
||
|
|
|
||
|
|
return ulReturnValue;
|
||
|
|
}
|
||
|
|
/*-----------------------------------------------------------*/
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Atomic swap (pointers)
|
||
|
|
*
|
||
|
|
* @brief Atomically sets the address pointed to by *ppvDestination to the value
|
||
|
|
* of *pvExchange.
|
||
|
|
*
|
||
|
|
* @param[in, out] ppvDestination Pointer to memory location from where a pointer
|
||
|
|
* value is to be loaded and written back to.
|
||
|
|
* @param[in] pvExchange Pointer value to be written to *ppvDestination.
|
||
|
|
*
|
||
|
|
* @return The initial value of *ppvDestination.
|
||
|
|
*/
|
||
|
|
static portFORCE_INLINE void * Atomic_SwapPointers_p32( void * volatile * ppvDestination,
|
||
|
|
void * pvExchange )
|
||
|
|
{
|
||
|
|
void * pReturnValue;
|
||
|
|
|
||
|
|
ATOMIC_ENTER_CRITICAL();
|
||
|
|
{
|
||
|
|
pReturnValue = *ppvDestination;
|
||
|
|
*ppvDestination = pvExchange;
|
||
|
|
}
|
||
|
|
ATOMIC_EXIT_CRITICAL();
|
||
|
|
|
||
|
|
return pReturnValue;
|
||
|
|
}
|
||
|
|
/*-----------------------------------------------------------*/
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Atomic compare-and-swap (pointers)
|
||
|
|
*
|
||
|
|
* @brief Performs an atomic compare-and-swap operation on the specified pointer
|
||
|
|
* values.
|
||
|
|
*
|
||
|
|
* @param[in, out] ppvDestination Pointer to memory location from where a pointer
|
||
|
|
* value is to be loaded and checked.
|
||
|
|
* @param[in] pvExchange If condition meets, write this value to memory.
|
||
|
|
* @param[in] pvComparand Swap condition.
|
||
|
|
*
|
||
|
|
* @return Unsigned integer of value 1 or 0. 1 for swapped, 0 for not swapped.
|
||
|
|
*
|
||
|
|
* @note This function only swaps *ppvDestination with pvExchange, if previous
|
||
|
|
* *ppvDestination value equals pvComparand.
|
||
|
|
*/
|
||
|
|
static portFORCE_INLINE uint32_t Atomic_CompareAndSwapPointers_p32( void * volatile * ppvDestination,
|
||
|
|
void * pvExchange,
|
||
|
|
void * pvComparand )
|
||
|
|
{
|
||
|
|
uint32_t ulReturnValue = ATOMIC_COMPARE_AND_SWAP_FAILURE;
|
||
|
|
|
||
|
|
ATOMIC_ENTER_CRITICAL();
|
||
|
|
{
|
||
|
|
if( *ppvDestination == pvComparand )
|
||
|
|
{
|
||
|
|
*ppvDestination = pvExchange;
|
||
|
|
ulReturnValue = ATOMIC_COMPARE_AND_SWAP_SUCCESS;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
ATOMIC_EXIT_CRITICAL();
|
||
|
|
|
||
|
|
return ulReturnValue;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/*----------------------------- Arithmetic ------------------------------*/
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Atomic add
|
||
|
|
*
|
||
|
|
* @brief Atomically adds count to the value of the specified pointer points to.
|
||
|
|
*
|
||
|
|
* @param[in,out] pulAddend Pointer to memory location from where value is to be
|
||
|
|
* loaded and written back to.
|
||
|
|
* @param[in] ulCount Value to be added to *pulAddend.
|
||
|
|
*
|
||
|
|
* @return previous *pulAddend value.
|
||
|
|
*/
|
||
|
|
static portFORCE_INLINE uint32_t Atomic_Add_u32( uint32_t volatile * pulAddend,
|
||
|
|
uint32_t ulCount )
|
||
|
|
{
|
||
|
|
uint32_t ulCurrent;
|
||
|
|
|
||
|
|
ATOMIC_ENTER_CRITICAL();
|
||
|
|
{
|
||
|
|
ulCurrent = *pulAddend;
|
||
|
|
*pulAddend += ulCount;
|
||
|
|
}
|
||
|
|
ATOMIC_EXIT_CRITICAL();
|
||
|
|
|
||
|
|
return ulCurrent;
|
||
|
|
}
|
||
|
|
/*-----------------------------------------------------------*/
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Atomic subtract
|
||
|
|
*
|
||
|
|
* @brief Atomically subtracts count from the value of the specified pointer
|
||
|
|
* pointers to.
|
||
|
|
*
|
||
|
|
* @param[in,out] pulAddend Pointer to memory location from where value is to be
|
||
|
|
* loaded and written back to.
|
||
|
|
* @param[in] ulCount Value to be subtract from *pulAddend.
|
||
|
|
*
|
||
|
|
* @return previous *pulAddend value.
|
||
|
|
*/
|
||
|
|
static portFORCE_INLINE uint32_t Atomic_Subtract_u32( uint32_t volatile * pulAddend,
|
||
|
|
uint32_t ulCount )
|
||
|
|
{
|
||
|
|
uint32_t ulCurrent;
|
||
|
|
|
||
|
|
ATOMIC_ENTER_CRITICAL();
|
||
|
|
{
|
||
|
|
ulCurrent = *pulAddend;
|
||
|
|
*pulAddend -= ulCount;
|
||
|
|
}
|
||
|
|
ATOMIC_EXIT_CRITICAL();
|
||
|
|
|
||
|
|
return ulCurrent;
|
||
|
|
}
|
||
|
|
/*-----------------------------------------------------------*/
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Atomic increment
|
||
|
|
*
|
||
|
|
* @brief Atomically increments the value of the specified pointer points to.
|
||
|
|
*
|
||
|
|
* @param[in,out] pulAddend Pointer to memory location from where value is to be
|
||
|
|
* loaded and written back to.
|
||
|
|
*
|
||
|
|
* @return *pulAddend value before increment.
|
||
|
|
*/
|
||
|
|
static portFORCE_INLINE uint32_t Atomic_Increment_u32( uint32_t volatile * pulAddend )
|
||
|
|
{
|
||
|
|
uint32_t ulCurrent;
|
||
|
|
|
||
|
|
ATOMIC_ENTER_CRITICAL();
|
||
|
|
{
|
||
|
|
ulCurrent = *pulAddend;
|
||
|
|
*pulAddend += 1;
|
||
|
|
}
|
||
|
|
ATOMIC_EXIT_CRITICAL();
|
||
|
|
|
||
|
|
return ulCurrent;
|
||
|
|
}
|
||
|
|
/*-----------------------------------------------------------*/
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Atomic decrement
|
||
|
|
*
|
||
|
|
* @brief Atomically decrements the value of the specified pointer points to
|
||
|
|
*
|
||
|
|
* @param[in,out] pulAddend Pointer to memory location from where value is to be
|
||
|
|
* loaded and written back to.
|
||
|
|
*
|
||
|
|
* @return *pulAddend value before decrement.
|
||
|
|
*/
|
||
|
|
static portFORCE_INLINE uint32_t Atomic_Decrement_u32( uint32_t volatile * pulAddend )
|
||
|
|
{
|
||
|
|
uint32_t ulCurrent;
|
||
|
|
|
||
|
|
ATOMIC_ENTER_CRITICAL();
|
||
|
|
{
|
||
|
|
ulCurrent = *pulAddend;
|
||
|
|
*pulAddend -= 1;
|
||
|
|
}
|
||
|
|
ATOMIC_EXIT_CRITICAL();
|
||
|
|
|
||
|
|
return ulCurrent;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*----------------------------- Bitwise Logical ------------------------------*/
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Atomic OR
|
||
|
|
*
|
||
|
|
* @brief Performs an atomic OR operation on the specified values.
|
||
|
|
*
|
||
|
|
* @param [in, out] pulDestination Pointer to memory location from where value is
|
||
|
|
* to be loaded and written back to.
|
||
|
|
* @param [in] ulValue Value to be ORed with *pulDestination.
|
||
|
|
*
|
||
|
|
* @return The original value of *pulDestination.
|
||
|
|
*/
|
||
|
|
static portFORCE_INLINE uint32_t Atomic_OR_u32( uint32_t volatile * pulDestination,
|
||
|
|
uint32_t ulValue )
|
||
|
|
{
|
||
|
|
uint32_t ulCurrent;
|
||
|
|
|
||
|
|
ATOMIC_ENTER_CRITICAL();
|
||
|
|
{
|
||
|
|
ulCurrent = *pulDestination;
|
||
|
|
*pulDestination |= ulValue;
|
||
|
|
}
|
||
|
|
ATOMIC_EXIT_CRITICAL();
|
||
|
|
|
||
|
|
return ulCurrent;
|
||
|
|
}
|
||
|
|
/*-----------------------------------------------------------*/
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Atomic AND
|
||
|
|
*
|
||
|
|
* @brief Performs an atomic AND operation on the specified values.
|
||
|
|
*
|
||
|
|
* @param [in, out] pulDestination Pointer to memory location from where value is
|
||
|
|
* to be loaded and written back to.
|
||
|
|
* @param [in] ulValue Value to be ANDed with *pulDestination.
|
||
|
|
*
|
||
|
|
* @return The original value of *pulDestination.
|
||
|
|
*/
|
||
|
|
static portFORCE_INLINE uint32_t Atomic_AND_u32( uint32_t volatile * pulDestination,
|
||
|
|
uint32_t ulValue )
|
||
|
|
{
|
||
|
|
uint32_t ulCurrent;
|
||
|
|
|
||
|
|
ATOMIC_ENTER_CRITICAL();
|
||
|
|
{
|
||
|
|
ulCurrent = *pulDestination;
|
||
|
|
*pulDestination &= ulValue;
|
||
|
|
}
|
||
|
|
ATOMIC_EXIT_CRITICAL();
|
||
|
|
|
||
|
|
return ulCurrent;
|
||
|
|
}
|
||
|
|
/*-----------------------------------------------------------*/
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Atomic NAND
|
||
|
|
*
|
||
|
|
* @brief Performs an atomic NAND operation on the specified values.
|
||
|
|
*
|
||
|
|
* @param [in, out] pulDestination Pointer to memory location from where value is
|
||
|
|
* to be loaded and written back to.
|
||
|
|
* @param [in] ulValue Value to be NANDed with *pulDestination.
|
||
|
|
*
|
||
|
|
* @return The original value of *pulDestination.
|
||
|
|
*/
|
||
|
|
static portFORCE_INLINE uint32_t Atomic_NAND_u32( uint32_t volatile * pulDestination,
|
||
|
|
uint32_t ulValue )
|
||
|
|
{
|
||
|
|
uint32_t ulCurrent;
|
||
|
|
|
||
|
|
ATOMIC_ENTER_CRITICAL();
|
||
|
|
{
|
||
|
|
ulCurrent = *pulDestination;
|
||
|
|
*pulDestination = ~( ulCurrent & ulValue );
|
||
|
|
}
|
||
|
|
ATOMIC_EXIT_CRITICAL();
|
||
|
|
|
||
|
|
return ulCurrent;
|
||
|
|
}
|
||
|
|
/*-----------------------------------------------------------*/
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Atomic XOR
|
||
|
|
*
|
||
|
|
* @brief Performs an atomic XOR operation on the specified values.
|
||
|
|
*
|
||
|
|
* @param [in, out] pulDestination Pointer to memory location from where value is
|
||
|
|
* to be loaded and written back to.
|
||
|
|
* @param [in] ulValue Value to be XORed with *pulDestination.
|
||
|
|
*
|
||
|
|
* @return The original value of *pulDestination.
|
||
|
|
*/
|
||
|
|
static portFORCE_INLINE uint32_t Atomic_XOR_u32( uint32_t volatile * pulDestination,
|
||
|
|
uint32_t ulValue )
|
||
|
|
{
|
||
|
|
uint32_t ulCurrent;
|
||
|
|
|
||
|
|
ATOMIC_ENTER_CRITICAL();
|
||
|
|
{
|
||
|
|
ulCurrent = *pulDestination;
|
||
|
|
*pulDestination ^= ulValue;
|
||
|
|
}
|
||
|
|
ATOMIC_EXIT_CRITICAL();
|
||
|
|
|
||
|
|
return ulCurrent;
|
||
|
|
}
|
||
|
|
|
||
|
|
#ifdef __cplusplus
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#endif /* ATOMIC_H */
|