From 666301dd756a9381c47164b39bb9a626b6c76412 Mon Sep 17 00:00:00 2001 From: yuhzheng Date: Mon, 23 Sep 2019 16:51:03 +0000 Subject: [PATCH] sync from github to svn: this version of atomic.h does not have compiler specific symbols. compiler specific optimization is to be merged in each port// directory. git-svn-id: https://svn.code.sf.net/p/freertos/code/trunk@2725 1d2547de-c912-0410-9cb9-b8ca96c0e9e2 --- FreeRTOS/Source/include/atomic.h | 418 +++++++++++++++++++++++++++++++ 1 file changed, 418 insertions(+) create mode 100644 FreeRTOS/Source/include/atomic.h diff --git a/FreeRTOS/Source/include/atomic.h b/FreeRTOS/Source/include/atomic.h new file mode 100644 index 000000000..576b5db67 --- /dev/null +++ b/FreeRTOS/Source/include/atomic.h @@ -0,0 +1,418 @@ +/* + * FreeRTOS Kernel V10.2.1 + * Copyright (C) 2019 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 by disabling interrupts globally. + * Implementation with architecture specific atomic instructions + * are to 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 + +#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 considerred as performance optimization for atomic. + * Thus, if portFORCE_INLINE is not provided by portmacro.h, instead of resulting error, + * simply define it. + */ +#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] pDestination 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 *pDestination with ulExchange, if previous + * *pDestination value equals ulComparand. + */ +static portFORCE_INLINE uint32_t Atomic_CompareAndSwap_u32( + uint32_t volatile * pDestination, + uint32_t ulExchange, + uint32_t ulComparand ) +{ + + uint32_t ulReturnValue = ATOMIC_COMPARE_AND_SWAP_FAILURE; + + ATOMIC_ENTER_CRITICAL(); + + if ( *pDestination == ulComparand ) + { + *pDestination = ulExchange; + ulReturnValue = ATOMIC_COMPARE_AND_SWAP_SUCCESS; + } + + ATOMIC_EXIT_CRITICAL(); + + return ulReturnValue; + +} + +/** + * Atomic swap (pointers) + * + * @brief Atomically sets the address pointed to by *ppDestination to the value + * of *pExchange. + * + * @param[in, out] ppDestination Pointer to memory location from where a pointer + * value is to be loaded and written back to. + * @param[in] pExchange Pointer value to be written to *ppDestination. + * + * @return The initial value of *ppDestination. + */ +static portFORCE_INLINE void * Atomic_SwapPointers_p32( + void * volatile * ppDestination, + void * pExchange ) +{ + void * pReturnValue; + + ATOMIC_ENTER_CRITICAL(); + + pReturnValue = *ppDestination; + + *ppDestination = pExchange; + + 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] ppDestination Pointer to memory location from where a pointer + * value is to be loaded and checked. + * @param[in] pExchange If condition meets, write this value to memory. + * @param[in] pComparand Swap condition. + * + * @return Unsigned integer of value 1 or 0. 1 for swapped, 0 for not swapped. + * + * @note This function only swaps *ppDestination with pExchange, if previous + * *ppDestination value equals pComparand. + */ +static portFORCE_INLINE uint32_t Atomic_CompareAndSwapPointers_p32( + void * volatile * ppDestination, + void * pExchange, void * pComparand ) +{ + uint32_t ulReturnValue = ATOMIC_COMPARE_AND_SWAP_FAILURE; + + ATOMIC_ENTER_CRITICAL(); + + if ( *ppDestination == pComparand ) + { + *ppDestination = pExchange; + 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] pAddend Pointer to memory location from where value is to be + * loaded and written back to. + * @param[in] ulCount Value to be added to *pAddend. + * + * @return previous *pAddend value. + */ +static portFORCE_INLINE uint32_t Atomic_Add_u32( + uint32_t volatile * pAddend, + uint32_t ulCount ) +{ + uint32_t ulCurrent; + + ATOMIC_ENTER_CRITICAL(); + + ulCurrent = *pAddend; + + *pAddend += ulCount; + + ATOMIC_EXIT_CRITICAL(); + + return ulCurrent; +} + +/** + * Atomic subtract + * + * @brief Atomically subtracts count from the value of the specified pointer + * pointers to. + * + * @param[in,out] pAddend Pointer to memory location from where value is to be + * loaded and written back to. + * @param[in] ulCount Value to be subtract from *pAddend. + * + * @return previous *pAddend value. + */ +static portFORCE_INLINE uint32_t Atomic_Subtract_u32( + uint32_t volatile * pAddend, + uint32_t ulCount ) +{ + uint32_t ulCurrent; + + ATOMIC_ENTER_CRITICAL(); + + ulCurrent = *pAddend; + + *pAddend -= ulCount; + + ATOMIC_EXIT_CRITICAL(); + + return ulCurrent; +} + +/** + * Atomic increment + * + * @brief Atomically increments the value of the specified pointer points to. + * + * @param[in,out] pAddend Pointer to memory location from where value is to be + * loaded and written back to. + * + * @return *pAddend value before increment. + */ +static portFORCE_INLINE uint32_t Atomic_Increment_u32( uint32_t volatile * pAddend ) +{ + uint32_t ulCurrent; + + ATOMIC_ENTER_CRITICAL(); + + ulCurrent = *pAddend; + + *pAddend += 1; + + ATOMIC_EXIT_CRITICAL(); + + return ulCurrent; +} + +/** + * Atomic decrement + * + * @brief Atomically decrements the value of the specified pointer points to + * + * @param[in,out] pAddend Pointer to memory location from where value is to be + * loaded and written back to. + * + * @return *pAddend value before decrement. + */ +static portFORCE_INLINE uint32_t Atomic_Decrement_u32( uint32_t volatile * pAddend ) +{ + uint32_t ulCurrent; + + ATOMIC_ENTER_CRITICAL(); + + ulCurrent = *pAddend; + + *pAddend -= 1; + + ATOMIC_EXIT_CRITICAL(); + + return ulCurrent; +} + +/*----------------------------- Bitwise Logical ------------------------------*/ + +/** + * Atomic OR + * + * @brief Performs an atomic OR operation on the specified values. + * + * @param [in, out] pDestination Pointer to memory location from where value is + * to be loaded and written back to. + * @param [in] ulValue Value to be ORed with *pDestination. + * + * @return The original value of *pDestination. + */ +static portFORCE_INLINE uint32_t Atomic_OR_u32( + uint32_t volatile * pDestination, + uint32_t ulValue ) +{ + uint32_t ulCurrent; + + ATOMIC_ENTER_CRITICAL(); + + ulCurrent = *pDestination; + + *pDestination |= ulValue; + + ATOMIC_EXIT_CRITICAL(); + + return ulCurrent; +} + +/** + * Atomic AND + * + * @brief Performs an atomic AND operation on the specified values. + * + * @param [in, out] pDestination Pointer to memory location from where value is + * to be loaded and written back to. + * @param [in] ulValue Value to be ANDed with *pDestination. + * + * @return The original value of *pDestination. + */ +static portFORCE_INLINE uint32_t Atomic_AND_u32( + uint32_t volatile * pDestination, + uint32_t ulValue ) +{ + uint32_t ulCurrent; + + ATOMIC_ENTER_CRITICAL(); + + ulCurrent = *pDestination; + + *pDestination &= ulValue; + + ATOMIC_EXIT_CRITICAL(); + + return ulCurrent; +} + +/** + * Atomic NAND + * + * @brief Performs an atomic NAND operation on the specified values. + * + * @param [in, out] pDestination Pointer to memory location from where value is + * to be loaded and written back to. + * @param [in] ulValue Value to be NANDed with *pDestination. + * + * @return The original value of *pDestination. + */ +static portFORCE_INLINE uint32_t Atomic_NAND_u32( + uint32_t volatile * pDestination, + uint32_t ulValue ) +{ + uint32_t ulCurrent; + + ATOMIC_ENTER_CRITICAL(); + + ulCurrent = *pDestination; + + *pDestination = ~(ulCurrent & ulValue); + + ATOMIC_EXIT_CRITICAL(); + + return ulCurrent; +} + +/** + * Atomic XOR + * + * @brief Performs an atomic XOR operation on the specified values. + * + * @param [in, out] pDestination Pointer to memory location from where value is + * to be loaded and written back to. + * @param [in] ulValue Value to be XORed with *pDestination. + * + * @return The original value of *pDestination. + */ +static portFORCE_INLINE uint32_t Atomic_XOR_u32( + uint32_t volatile * pDestination, + uint32_t ulValue ) +{ + uint32_t ulCurrent; + + ATOMIC_ENTER_CRITICAL(); + + ulCurrent = *pDestination; + + *pDestination ^= ulValue; + + ATOMIC_EXIT_CRITICAL(); + + return ulCurrent; +} + +#ifdef __cplusplus +} +#endif + +#endif /* ATOMIC_H */ -- 2.39.5