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author | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2016-02-18 08:36:16 +0100 |
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committer | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2016-03-04 13:36:10 +0100 |
commit | 90d8567d34a6d80da04b1cb37b667a3173f584c4 (patch) | |
tree | 221e66b9da1dd9dd79d01e507f0026bfb477b810 /cpukit/score/include/rtems/score/smpimpl.h | |
parent | score: Add _SMP_Before_multitasking_action() (diff) | |
download | rtems-90d8567d34a6d80da04b1cb37b667a3173f584c4.tar.bz2 |
score: Distribute clock tick to all online CPUs
Update #2554.
Diffstat (limited to '')
-rw-r--r-- | cpukit/score/include/rtems/score/smpimpl.h | 34 |
1 files changed, 22 insertions, 12 deletions
diff --git a/cpukit/score/include/rtems/score/smpimpl.h b/cpukit/score/include/rtems/score/smpimpl.h index 59a99ec6b3..d1b7214bbb 100644 --- a/cpukit/score/include/rtems/score/smpimpl.h +++ b/cpukit/score/include/rtems/score/smpimpl.h @@ -60,6 +60,16 @@ extern "C" { #define SMP_MESSAGE_MULTICAST_ACTION 0x4UL /** + * @brief SMP message to request a clock tick. + * + * This message is provided for systems without a proper interrupt affinity + * support and may be used by the clock driver. + * + * @see _SMP_Send_message(). + */ +#define SMP_MESSAGE_CLOCK_TICK 0x8UL + +/** * @brief SMP fatal codes. */ typedef enum { @@ -152,10 +162,13 @@ void _SMP_Multicast_actions_process( void ); /** * @brief Interrupt handler for inter-processor interrupts. + * + * @return The received message. */ -static inline void _SMP_Inter_processor_interrupt_handler( void ) +static inline long unsigned _SMP_Inter_processor_interrupt_handler( void ) { Per_CPU_Control *cpu_self = _Per_CPU_Get(); + unsigned long message = 0; /* * In the common case the inter-processor interrupt is issued to carry out a @@ -164,7 +177,7 @@ static inline void _SMP_Inter_processor_interrupt_handler( void ) cpu_self->dispatch_necessary = true; if ( _Atomic_Load_ulong( &cpu_self->message, ATOMIC_ORDER_RELAXED ) != 0 ) { - unsigned long message = _Atomic_Exchange_ulong( + message = _Atomic_Exchange_ulong( &cpu_self->message, 0UL, ATOMIC_ORDER_RELAXED @@ -183,6 +196,8 @@ static inline void _SMP_Inter_processor_interrupt_handler( void ) _SMP_Multicast_actions_process(); } } + + return message; } /** @@ -197,7 +212,7 @@ static inline void _SMP_Inter_processor_interrupt_handler( void ) bool _SMP_Should_start_processor( uint32_t cpu_index ); /** - * @brief Sends a SMP message to a processor. + * @brief Sends an SMP message to a processor. * * The target processor may be the sending processor. * @@ -207,21 +222,16 @@ bool _SMP_Should_start_processor( uint32_t cpu_index ); void _SMP_Send_message( uint32_t cpu_index, unsigned long message ); /** - * @brief Request of others CPUs. + * @brief Sends an SMP message to all other online processors. * - * This method is invoked by RTEMS when it needs to make a request - * of the other CPUs. It should be implemented using some type of - * interprocessor interrupt. CPUs not including the originating - * CPU should receive the message. - * - * @param [in] message is message to send + * @param[in] message The message. */ void _SMP_Send_message_broadcast( unsigned long message ); /** - * @brief Sends a SMP message to a set of processors. + * @brief Sends an SMP message to a set of processors. * * The sending processor may be part of the set. * @@ -238,7 +248,7 @@ void _SMP_Send_message_multicast( typedef void ( *SMP_Action_handler )( void *arg ); /** - * @brief Initiates a SMP multicast action to a set of processors. + * @brief Initiates an SMP multicast action to a set of processors. * * The current processor may be part of the set. * |