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|
/**
* @file
*
* @brief Atomic Operations CPU API
*/
/*
* COPYRIGHT (c) 2013 Deng Hengyi.
* Copyright (c) 2015 embedded brains GmbH.
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#ifndef _RTEMS_SCORE_CPUSTDATOMIC_H
#define _RTEMS_SCORE_CPUSTDATOMIC_H
#include <rtems/score/basedefs.h>
#ifdef RTEMS_SMP
#if defined(__cplusplus) \
&& (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 9))
/*
* The GCC 4.9 ships its own <stdatomic.h> which is not C++ compatible. The
* suggested solution was to include <atomic> in case C++ is used. This works
* at least with GCC 4.9. See also:
*
* http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60932
* http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60940
*/
#include <atomic>
#define _RTEMS_SCORE_CPUSTDATOMIC_USE_ATOMIC
#else
#include <stdatomic.h>
#define _RTEMS_SCORE_CPUSTDATOMIC_USE_STDATOMIC
#endif
#else
#include <rtems/score/isrlevel.h>
#endif
#if defined(_RTEMS_SCORE_CPUSTDATOMIC_USE_ATOMIC)
typedef std::atomic_uint CPU_atomic_Uint;
typedef std::atomic_ulong CPU_atomic_Ulong;
typedef std::atomic_uintptr_t CPU_atomic_Uintptr;
typedef std::atomic_flag CPU_atomic_Flag;
typedef std::memory_order CPU_atomic_Order;
#define CPU_ATOMIC_ORDER_RELAXED std::memory_order_relaxed
#define CPU_ATOMIC_ORDER_ACQUIRE std::memory_order_acquire
#define CPU_ATOMIC_ORDER_RELEASE std::memory_order_release
#define CPU_ATOMIC_ORDER_ACQ_REL std::memory_order_acq_rel
#define CPU_ATOMIC_ORDER_SEQ_CST std::memory_order_seq_cst
#define CPU_ATOMIC_INITIALIZER_UINT( value ) ATOMIC_VAR_INIT( value )
#define CPU_ATOMIC_INITIALIZER_ULONG( value ) ATOMIC_VAR_INIT( value )
#define CPU_ATOMIC_INITIALIZER_UINTPTR( value ) ATOMIC_VAR_INIT( value )
#define CPU_ATOMIC_INITIALIZER_FLAG ATOMIC_FLAG_INIT
#elif defined(_RTEMS_SCORE_CPUSTDATOMIC_USE_STDATOMIC)
typedef atomic_uint CPU_atomic_Uint;
typedef atomic_ulong CPU_atomic_Ulong;
typedef atomic_uintptr_t CPU_atomic_Uintptr;
typedef atomic_flag CPU_atomic_Flag;
typedef memory_order CPU_atomic_Order;
#define CPU_ATOMIC_ORDER_RELAXED memory_order_relaxed
#define CPU_ATOMIC_ORDER_ACQUIRE memory_order_acquire
#define CPU_ATOMIC_ORDER_RELEASE memory_order_release
#define CPU_ATOMIC_ORDER_ACQ_REL memory_order_acq_rel
#define CPU_ATOMIC_ORDER_SEQ_CST memory_order_seq_cst
#define CPU_ATOMIC_INITIALIZER_UINT( value ) ATOMIC_VAR_INIT( value )
#define CPU_ATOMIC_INITIALIZER_ULONG( value ) ATOMIC_VAR_INIT( value )
#define CPU_ATOMIC_INITIALIZER_UINTPTR( value ) ATOMIC_VAR_INIT( value )
#define CPU_ATOMIC_INITIALIZER_FLAG ATOMIC_FLAG_INIT
#else
typedef unsigned int CPU_atomic_Uint;
typedef unsigned long CPU_atomic_Ulong;
typedef uintptr_t CPU_atomic_Uintptr;
typedef bool CPU_atomic_Flag;
typedef int CPU_atomic_Order;
#define CPU_ATOMIC_ORDER_RELAXED 0
#define CPU_ATOMIC_ORDER_ACQUIRE 2
#define CPU_ATOMIC_ORDER_RELEASE 3
#define CPU_ATOMIC_ORDER_ACQ_REL 4
#define CPU_ATOMIC_ORDER_SEQ_CST 5
#define CPU_ATOMIC_INITIALIZER_UINT( value ) ( value )
#define CPU_ATOMIC_INITIALIZER_ULONG( value ) ( value )
#define CPU_ATOMIC_INITIALIZER_UINTPTR( value ) ( value )
#define CPU_ATOMIC_INITIALIZER_FLAG false
#endif
static inline void _CPU_atomic_Fence( CPU_atomic_Order order )
{
#if defined(_RTEMS_SCORE_CPUSTDATOMIC_USE_ATOMIC)
std::atomic_thread_fence( order );
#elif defined(_RTEMS_SCORE_CPUSTDATOMIC_USE_STDATOMIC)
atomic_thread_fence( order );
#else
(void) order;
RTEMS_COMPILER_MEMORY_BARRIER();
#endif
}
static inline void _CPU_atomic_Init_uint( CPU_atomic_Uint *obj, unsigned int desired )
{
#if defined(_RTEMS_SCORE_CPUSTDATOMIC_USE_ATOMIC)
obj->store( desired );
#elif defined(_RTEMS_SCORE_CPUSTDATOMIC_USE_STDATOMIC)
atomic_init( obj, desired );
#else
*obj = desired;
#endif
}
static inline void _CPU_atomic_Init_ulong( CPU_atomic_Ulong *obj, unsigned long desired )
{
#if defined(_RTEMS_SCORE_CPUSTDATOMIC_USE_ATOMIC)
obj->store( desired );
#elif defined(_RTEMS_SCORE_CPUSTDATOMIC_USE_STDATOMIC)
atomic_init( obj, desired );
#else
*obj = desired;
#endif
}
static inline void _CPU_atomic_Init_uintptr( CPU_atomic_Uintptr *obj, uintptr_t desired )
{
#if defined(_RTEMS_SCORE_CPUSTDATOMIC_USE_ATOMIC)
obj->store( desired );
#elif defined(_RTEMS_SCORE_CPUSTDATOMIC_USE_STDATOMIC)
atomic_init( obj, desired );
#else
*obj = desired;
#endif
}
static inline unsigned int _CPU_atomic_Load_uint( const CPU_atomic_Uint *obj, CPU_atomic_Order order )
{
#if defined(_RTEMS_SCORE_CPUSTDATOMIC_USE_ATOMIC)
return obj->load( order );
#elif defined(_RTEMS_SCORE_CPUSTDATOMIC_USE_STDATOMIC)
return atomic_load_explicit( obj, order );
#else
unsigned int val;
(void) order;
val = *obj;
RTEMS_COMPILER_MEMORY_BARRIER();
return val;
#endif
}
static inline unsigned long _CPU_atomic_Load_ulong( const CPU_atomic_Ulong *obj, CPU_atomic_Order order )
{
#if defined(_RTEMS_SCORE_CPUSTDATOMIC_USE_ATOMIC)
return obj->load( order );
#elif defined(_RTEMS_SCORE_CPUSTDATOMIC_USE_STDATOMIC)
return atomic_load_explicit( obj, order );
#else
unsigned long val;
(void) order;
val = *obj;
RTEMS_COMPILER_MEMORY_BARRIER();
return val;
#endif
}
static inline uintptr_t _CPU_atomic_Load_uintptr( const CPU_atomic_Uintptr *obj, CPU_atomic_Order order )
{
#if defined(_RTEMS_SCORE_CPUSTDATOMIC_USE_ATOMIC)
return obj->load( order );
#elif defined(_RTEMS_SCORE_CPUSTDATOMIC_USE_STDATOMIC)
return atomic_load_explicit( obj, order );
#else
uintptr_t val;
(void) order;
val = *obj;
RTEMS_COMPILER_MEMORY_BARRIER();
return val;
#endif
}
static inline void _CPU_atomic_Store_uint( CPU_atomic_Uint *obj, unsigned int desired, CPU_atomic_Order order )
{
#if defined(_RTEMS_SCORE_CPUSTDATOMIC_USE_ATOMIC)
obj->store( desired );
#elif defined(_RTEMS_SCORE_CPUSTDATOMIC_USE_STDATOMIC)
atomic_store_explicit( obj, desired, order );
#else
(void) order;
RTEMS_COMPILER_MEMORY_BARRIER();
*obj = desired;
#endif
}
static inline void _CPU_atomic_Store_ulong( CPU_atomic_Ulong *obj, unsigned long desired, CPU_atomic_Order order )
{
#if defined(_RTEMS_SCORE_CPUSTDATOMIC_USE_ATOMIC)
obj->store( desired );
#elif defined(_RTEMS_SCORE_CPUSTDATOMIC_USE_STDATOMIC)
atomic_store_explicit( obj, desired, order );
#else
(void) order;
RTEMS_COMPILER_MEMORY_BARRIER();
*obj = desired;
#endif
}
static inline void _CPU_atomic_Store_uintptr( CPU_atomic_Uintptr *obj, uintptr_t desired, CPU_atomic_Order order )
{
#if defined(_RTEMS_SCORE_CPUSTDATOMIC_USE_ATOMIC)
obj->store( desired );
#elif defined(_RTEMS_SCORE_CPUSTDATOMIC_USE_STDATOMIC)
atomic_store_explicit( obj, desired, order );
#else
(void) order;
RTEMS_COMPILER_MEMORY_BARRIER();
*obj = desired;
#endif
}
static inline unsigned int _CPU_atomic_Fetch_add_uint( CPU_atomic_Uint *obj, unsigned int arg, CPU_atomic_Order order )
{
#if defined(_RTEMS_SCORE_CPUSTDATOMIC_USE_ATOMIC)
return obj->fetch_add( arg, order );
#elif defined(_RTEMS_SCORE_CPUSTDATOMIC_USE_STDATOMIC)
return atomic_fetch_add_explicit( obj, arg, order );
#else
unsigned int val;
ISR_Level level;
(void) order;
_ISR_Local_disable( level );
val = *obj;
*obj = val + arg;
_ISR_Local_enable( level );
return val;
#endif
}
static inline unsigned long _CPU_atomic_Fetch_add_ulong( CPU_atomic_Ulong *obj, unsigned long arg, CPU_atomic_Order order )
{
#if defined(_RTEMS_SCORE_CPUSTDATOMIC_USE_ATOMIC)
return obj->fetch_add( arg, order );
#elif defined(_RTEMS_SCORE_CPUSTDATOMIC_USE_STDATOMIC)
return atomic_fetch_add_explicit( obj, arg, order );
#else
unsigned long val;
ISR_Level level;
(void) order;
_ISR_Local_disable( level );
val = *obj;
*obj = val + arg;
_ISR_Local_enable( level );
return val;
#endif
}
static inline uintptr_t _CPU_atomic_Fetch_add_uintptr( CPU_atomic_Uintptr *obj, uintptr_t arg, CPU_atomic_Order order )
{
#if defined(_RTEMS_SCORE_CPUSTDATOMIC_USE_ATOMIC)
return obj->fetch_add( arg, order );
#elif defined(_RTEMS_SCORE_CPUSTDATOMIC_USE_STDATOMIC)
return atomic_fetch_add_explicit( obj, arg, order );
#else
uintptr_t val;
ISR_Level level;
(void) order;
_ISR_Local_disable( level );
val = *obj;
*obj = val + arg;
_ISR_Local_enable( level );
return val;
#endif
}
static inline unsigned int _CPU_atomic_Fetch_sub_uint( CPU_atomic_Uint *obj, unsigned int arg, CPU_atomic_Order order )
{
#if defined(_RTEMS_SCORE_CPUSTDATOMIC_USE_ATOMIC)
return obj->fetch_sub( arg, order );
#elif defined(_RTEMS_SCORE_CPUSTDATOMIC_USE_STDATOMIC)
return atomic_fetch_sub_explicit( obj, arg, order );
#else
unsigned int val;
ISR_Level level;
(void) order;
_ISR_Local_disable( level );
val = *obj;
*obj = val - arg;
_ISR_Local_enable( level );
return val;
#endif
}
static inline unsigned long _CPU_atomic_Fetch_sub_ulong( CPU_atomic_Ulong *obj, unsigned long arg, CPU_atomic_Order order )
{
#if defined(_RTEMS_SCORE_CPUSTDATOMIC_USE_ATOMIC)
return obj->fetch_sub( arg, order );
#elif defined(_RTEMS_SCORE_CPUSTDATOMIC_USE_STDATOMIC)
return atomic_fetch_sub_explicit( obj, arg, order );
#else
unsigned long val;
ISR_Level level;
(void) order;
_ISR_Local_disable( level );
val = *obj;
*obj = val - arg;
_ISR_Local_enable( level );
return val;
#endif
}
static inline uintptr_t _CPU_atomic_Fetch_sub_uintptr( CPU_atomic_Uintptr *obj, uintptr_t arg, CPU_atomic_Order order )
{
#if defined(_RTEMS_SCORE_CPUSTDATOMIC_USE_ATOMIC)
return obj->fetch_sub( arg, order );
#elif defined(_RTEMS_SCORE_CPUSTDATOMIC_USE_STDATOMIC)
return atomic_fetch_sub_explicit( obj, arg, order );
#else
uintptr_t val;
ISR_Level level;
(void) order;
_ISR_Local_disable( level );
val = *obj;
*obj = val - arg;
_ISR_Local_enable( level );
return val;
#endif
}
static inline unsigned int _CPU_atomic_Fetch_or_uint( CPU_atomic_Uint *obj, unsigned int arg, CPU_atomic_Order order )
{
#if defined(_RTEMS_SCORE_CPUSTDATOMIC_USE_ATOMIC)
return obj->fetch_or( arg, order );
#elif defined(_RTEMS_SCORE_CPUSTDATOMIC_USE_STDATOMIC)
return atomic_fetch_or_explicit( obj, arg, order );
#else
unsigned int val;
ISR_Level level;
(void) order;
_ISR_Local_disable( level );
val = *obj;
*obj = val | arg;
_ISR_Local_enable( level );
return val;
#endif
}
static inline unsigned long _CPU_atomic_Fetch_or_ulong( CPU_atomic_Ulong *obj, unsigned long arg, CPU_atomic_Order order )
{
#if defined(_RTEMS_SCORE_CPUSTDATOMIC_USE_ATOMIC)
return obj->fetch_or( arg, order );
#elif defined(_RTEMS_SCORE_CPUSTDATOMIC_USE_STDATOMIC)
return atomic_fetch_or_explicit( obj, arg, order );
#else
unsigned long val;
ISR_Level level;
(void) order;
_ISR_Local_disable( level );
val = *obj;
*obj = val | arg;
_ISR_Local_enable( level );
return val;
#endif
}
static inline uintptr_t _CPU_atomic_Fetch_or_uintptr( CPU_atomic_Uintptr *obj, uintptr_t arg, CPU_atomic_Order order )
{
#if defined(_RTEMS_SCORE_CPUSTDATOMIC_USE_ATOMIC)
return obj->fetch_or( arg, order );
#elif defined(_RTEMS_SCORE_CPUSTDATOMIC_USE_STDATOMIC)
return atomic_fetch_or_explicit( obj, arg, order );
#else
uintptr_t val;
ISR_Level level;
(void) order;
_ISR_Local_disable( level );
val = *obj;
*obj = val | arg;
_ISR_Local_enable( level );
return val;
#endif
}
static inline unsigned int _CPU_atomic_Fetch_and_uint( CPU_atomic_Uint *obj, unsigned int arg, CPU_atomic_Order order )
{
#if defined(_RTEMS_SCORE_CPUSTDATOMIC_USE_ATOMIC)
return obj->fetch_and( arg, order );
#elif defined(_RTEMS_SCORE_CPUSTDATOMIC_USE_STDATOMIC)
return atomic_fetch_and_explicit( obj, arg, order );
#else
unsigned int val;
ISR_Level level;
(void) order;
_ISR_Local_disable( level );
val = *obj;
*obj = val & arg;
_ISR_Local_enable( level );
return val;
#endif
}
static inline unsigned long _CPU_atomic_Fetch_and_ulong( CPU_atomic_Ulong *obj, unsigned long arg, CPU_atomic_Order order )
{
#if defined(_RTEMS_SCORE_CPUSTDATOMIC_USE_ATOMIC)
return obj->fetch_and( arg, order );
#elif defined(_RTEMS_SCORE_CPUSTDATOMIC_USE_STDATOMIC)
return atomic_fetch_and_explicit( obj, arg, order );
#else
unsigned long val;
ISR_Level level;
(void) order;
_ISR_Local_disable( level );
val = *obj;
*obj = val & arg;
_ISR_Local_enable( level );
return val;
#endif
}
static inline uintptr_t _CPU_atomic_Fetch_and_uintptr( CPU_atomic_Uintptr *obj, uintptr_t arg, CPU_atomic_Order order )
{
#if defined(_RTEMS_SCORE_CPUSTDATOMIC_USE_ATOMIC)
return obj->fetch_and( arg, order );
#elif defined(_RTEMS_SCORE_CPUSTDATOMIC_USE_STDATOMIC)
return atomic_fetch_and_explicit( obj, arg, order );
#else
uintptr_t val;
ISR_Level level;
(void) order;
_ISR_Local_disable( level );
val = *obj;
*obj = val & arg;
_ISR_Local_enable( level );
return val;
#endif
}
static inline unsigned int _CPU_atomic_Exchange_uint( CPU_atomic_Uint *obj, unsigned int desired, CPU_atomic_Order order )
{
#if defined(_RTEMS_SCORE_CPUSTDATOMIC_USE_ATOMIC)
return obj->exchange( desired, order );
#elif defined(_RTEMS_SCORE_CPUSTDATOMIC_USE_STDATOMIC)
return atomic_exchange_explicit( obj, desired, order );
#else
unsigned int val;
ISR_Level level;
(void) order;
_ISR_Local_disable( level );
val = *obj;
*obj = desired;
_ISR_Local_enable( level );
return val;
#endif
}
static inline unsigned long _CPU_atomic_Exchange_ulong( CPU_atomic_Ulong *obj, unsigned long desired, CPU_atomic_Order order )
{
#if defined(_RTEMS_SCORE_CPUSTDATOMIC_USE_ATOMIC)
return obj->exchange( desired, order );
#elif defined(_RTEMS_SCORE_CPUSTDATOMIC_USE_STDATOMIC)
return atomic_exchange_explicit( obj, desired, order );
#else
unsigned long val;
ISR_Level level;
(void) order;
_ISR_Local_disable( level );
val = *obj;
*obj = desired;
_ISR_Local_enable( level );
return val;
#endif
}
static inline uintptr_t _CPU_atomic_Exchange_uintptr( CPU_atomic_Uintptr *obj, uintptr_t desired, CPU_atomic_Order order )
{
#if defined(_RTEMS_SCORE_CPUSTDATOMIC_USE_ATOMIC)
return obj->exchange( desired, order );
#elif defined(_RTEMS_SCORE_CPUSTDATOMIC_USE_STDATOMIC)
return atomic_exchange_explicit( obj, desired, order );
#else
uintptr_t val;
ISR_Level level;
(void) order;
_ISR_Local_disable( level );
val = *obj;
*obj = desired;
_ISR_Local_enable( level );
return val;
#endif
}
static inline bool _CPU_atomic_Compare_exchange_uint( CPU_atomic_Uint *obj, unsigned int *expected, unsigned int desired, CPU_atomic_Order succ, CPU_atomic_Order fail )
{
#if defined(_RTEMS_SCORE_CPUSTDATOMIC_USE_ATOMIC)
return obj->compare_exchange_strong( *expected, desired, succ, fail );
#elif defined(_RTEMS_SCORE_CPUSTDATOMIC_USE_STDATOMIC)
return atomic_compare_exchange_strong_explicit( obj, expected, desired, succ, fail );
#else
bool success;
ISR_Level level;
unsigned int actual;
(void) succ;
(void) fail;
_ISR_Local_disable( level );
actual = *obj;
success = ( actual == *expected );
if ( success ) {
*obj = desired;
} else {
*expected = actual;
}
_ISR_Local_enable( level );
return success;
#endif
}
static inline bool _CPU_atomic_Compare_exchange_ulong( CPU_atomic_Ulong *obj, unsigned long *expected, unsigned long desired, CPU_atomic_Order succ, CPU_atomic_Order fail )
{
#if defined(_RTEMS_SCORE_CPUSTDATOMIC_USE_ATOMIC)
return obj->compare_exchange_strong( *expected, desired, succ, fail );
#elif defined(_RTEMS_SCORE_CPUSTDATOMIC_USE_STDATOMIC)
return atomic_compare_exchange_strong_explicit( obj, expected, desired, succ, fail );
#else
bool success;
ISR_Level level;
unsigned long actual;
(void) succ;
(void) fail;
_ISR_Local_disable( level );
actual = *obj;
success = ( actual == *expected );
if ( success ) {
*obj = desired;
} else {
*expected = actual;
}
_ISR_Local_enable( level );
return success;
#endif
}
static inline bool _CPU_atomic_Compare_exchange_uintptr( CPU_atomic_Uintptr *obj, uintptr_t *expected, uintptr_t desired, CPU_atomic_Order succ, CPU_atomic_Order fail )
{
#if defined(_RTEMS_SCORE_CPUSTDATOMIC_USE_ATOMIC)
return obj->compare_exchange_strong( *expected, desired, succ, fail );
#elif defined(_RTEMS_SCORE_CPUSTDATOMIC_USE_STDATOMIC)
return atomic_compare_exchange_strong_explicit( obj, expected, desired, succ, fail );
#else
bool success;
ISR_Level level;
uintptr_t actual;
(void) succ;
(void) fail;
_ISR_Local_disable( level );
actual = *obj;
success = ( actual == *expected );
if ( success ) {
*obj = desired;
} else {
*expected = actual;
}
_ISR_Local_enable( level );
return success;
#endif
}
static inline void _CPU_atomic_Flag_clear( CPU_atomic_Flag *obj, CPU_atomic_Order order )
{
#if defined(_RTEMS_SCORE_CPUSTDATOMIC_USE_ATOMIC)
obj->clear( order );
#elif defined(_RTEMS_SCORE_CPUSTDATOMIC_USE_STDATOMIC)
atomic_flag_clear_explicit( obj, order );
#else
(void) order;
*obj = false;
#endif
}
static inline bool _CPU_atomic_Flag_test_and_set( CPU_atomic_Flag *obj, CPU_atomic_Order order )
{
#if defined(_RTEMS_SCORE_CPUSTDATOMIC_USE_ATOMIC)
return obj->test_and_set( order );
#elif defined(_RTEMS_SCORE_CPUSTDATOMIC_USE_STDATOMIC)
return atomic_flag_test_and_set_explicit( obj, order );
#else
bool flag;
ISR_Level level;
(void) order;
_ISR_Local_disable( level );
flag = *obj;
*obj = true;
_ISR_Local_enable( level );
return flag;
#endif
}
#endif /* _RTEMS_SCORE_CPUSTDATOMIC_H */
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