/**
* @file
*
* @ingroup RTEMSScoreSMPImpl
*
* @brief SuperCore SMP Implementation
*/
/*
* COPYRIGHT (c) 1989-2011.
* On-Line Applications Research Corporation (OAR).
*
* 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_SMPIMPL_H
#define _RTEMS_SCORE_SMPIMPL_H
#include <rtems/score/smp.h>
#include <rtems/score/percpu.h>
#include <rtems/score/processormask.h>
#include <rtems/fatal.h>
#include <rtems/rtems/cache.h>
#ifdef __cplusplus
extern "C" {
#endif
/**
* @addtogroup RTEMSScoreSMP
*
* This defines the interface of the SuperCore SMP support.
*
* @{
*/
/**
* @brief SMP message to request a processor shutdown.
*
* @see _SMP_Send_message().
*/
#define SMP_MESSAGE_SHUTDOWN 0x1UL
/**
* @brief SMP message to request a test handler invocation.
*
* @see _SMP_Send_message().
*/
#define SMP_MESSAGE_TEST 0x2UL
/**
* @brief SMP message to request a multicast action.
*
* @see _SMP_Send_message().
*/
#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 {
SMP_FATAL_BOOT_PROCESSOR_NOT_ASSIGNED_TO_SCHEDULER,
SMP_FATAL_MANDATORY_PROCESSOR_NOT_PRESENT,
SMP_FATAL_MULTITASKING_START_ON_INVALID_PROCESSOR,
SMP_FATAL_MULTITASKING_START_ON_UNASSIGNED_PROCESSOR,
SMP_FATAL_SHUTDOWN,
SMP_FATAL_SHUTDOWN_RESPONSE,
SMP_FATAL_START_OF_MANDATORY_PROCESSOR_FAILED,
SMP_FATAL_SCHEDULER_PIN_OR_UNPIN_NOT_SUPPORTED
} SMP_Fatal_code;
static inline void _SMP_Fatal( SMP_Fatal_code code )
{
_Terminate( RTEMS_FATAL_SOURCE_SMP, code );
}
/**
* @brief Initialize SMP Handler
*
* This method initialize the SMP Handler.
*/
#if defined( RTEMS_SMP )
void _SMP_Handler_initialize( void );
#else
#define _SMP_Handler_initialize() \
do { } while ( 0 )
#endif
#if defined( RTEMS_SMP )
/**
* @brief Set of online processors.
*
* A processor is online if was started during system initialization. In this
* case its corresponding bit in the mask is set.
*
* @see _SMP_Handler_initialize().
*/
extern Processor_mask _SMP_Online_processors;
/**
* @brief Performs high-level initialization of a secondary processor and runs
* the application threads.
*
* The low-level initialization code must call this function to hand over the
* control of this processor to RTEMS. Interrupts must be disabled. It must
* be possible to send inter-processor interrupts to this processor. Since
* interrupts are disabled the inter-processor interrupt delivery is postponed
* until interrupts are enabled the first time. Interrupts are enabled during
* the execution begin of threads in case they have interrupt level zero (this
* is the default).
*
* The pre-requisites for the call to this function are
* - disabled interrupts,
* - delivery of inter-processor interrupts is possible,
* - a valid stack pointer and enough stack space,
* - a valid code memory, and
* - a valid BSS section.
*
* This function must not be called by the main processor. The main processor
* uses _Thread_Start_multitasking() instead.
*
* This function does not return to the caller.
*
* @param[in] cpu_self The current processor control.
*/
void _SMP_Start_multitasking_on_secondary_processor(
Per_CPU_Control *cpu_self
) RTEMS_NO_RETURN;
typedef void ( *SMP_Test_message_handler )( Per_CPU_Control *cpu_self );
extern SMP_Test_message_handler _SMP_Test_message_handler;
/**
* @brief Sets the handler for test messages.
*
* This handler can be used to test the inter-processor interrupt
* implementation.
*/
static inline void _SMP_Set_test_message_handler(
SMP_Test_message_handler handler
)
{
_SMP_Test_message_handler = handler;
}
/**
* @brief Processes all pending multicast actions.
*/
void _SMP_Multicast_actions_process( void );
/**
* @brief Interrupt handler for inter-processor interrupts.
*
* @return The received message.
*/
static inline long unsigned _SMP_Inter_processor_interrupt_handler(
Per_CPU_Control *cpu_self
)
{
unsigned long message;
/*
* In the common case the inter-processor interrupt is issued to carry out a
* thread dispatch.
*/
cpu_self->dispatch_necessary = true;
message = _Atomic_Exchange_ulong(
&cpu_self->message,
0,
ATOMIC_ORDER_ACQUIRE
);
if ( RTEMS_PREDICT_FALSE( message != 0 ) ) {
if ( ( message & SMP_MESSAGE_SHUTDOWN ) != 0 ) {
_SMP_Fatal( SMP_FATAL_SHUTDOWN_RESPONSE );
/* does not continue past here */
}
if ( ( message & SMP_MESSAGE_TEST ) != 0 ) {
( *_SMP_Test_message_handler )( cpu_self );
}
if ( ( message & SMP_MESSAGE_MULTICAST_ACTION ) != 0 ) {
_SMP_Multicast_actions_process();
}
}
return message;
}
/**
* @brief Returns true, if the processor with the specified index should be
* started.
*
* @param[in] cpu_index The processor index.
*
* @retval true The processor should be started.
* @retval false Otherwise.
*/
bool _SMP_Should_start_processor( uint32_t cpu_index );
/**
* @brief Sends an SMP message to a processor.
*
* The target processor may be the sending processor.
*
* @param[in] cpu_index The target processor of the message.
* @param[in] message The message.
*/
void _SMP_Send_message( uint32_t cpu_index, unsigned long message );
/**
* @brief Sends an SMP message to all other online processors.
*
* @param[in] message The message.
*/
void _SMP_Send_message_broadcast(
unsigned long message
);
/**
* @brief Sends an SMP message to a set of processors.
*
* The sending processor may be part of the set.
*
* @param[in] targets The set of processors to send the message.
* @param[in] message The message.
*/
void _SMP_Send_message_multicast(
const Processor_mask *targets,
unsigned long message
);
typedef void ( *SMP_Action_handler )( void *arg );
/**
* @brief Initiates an SMP multicast action to a set of processors.
*
* The current processor may be part of the set.
*
* @param[in] setsize The size of the set of target processors of the message.
* @param[in] cpus The set of target processors of the message.
* @param[in] handler The multicast action handler.
* @param[in] arg The multicast action argument.
*/
void _SMP_Multicast_action(
const size_t setsize,
const cpu_set_t *cpus,
SMP_Action_handler handler,
void *arg
);
/**
* @brief Executes a handler with argument on the specified processor on behalf
* of the boot processor.
*
* The calling processor must be the boot processor. In case the specified
* processor is not online or not in the
* PER_CPU_STATE_READY_TO_START_MULTITASKING state, then no action is
* performed.
*
* @param cpu The processor to execute the action.
* @param handler The handler of the action.
* @param arg The argument of the action.
*
* @retval true The handler executed on the specified processor.
* @retval false Otherwise.
*
* @see _SMP_Before_multitasking_action_broadcast().
*/
bool _SMP_Before_multitasking_action(
Per_CPU_Control *cpu,
SMP_Action_handler handler,
void *arg
);
/**
* @brief Executes a handler with argument on all online processors except the
* boot processor on behalf of the boot processor.
*
* The calling processor must be the boot processor.
*
* @param handler The handler of the action.
* @param arg The argument of the action.
*
* @retval true The handler executed on all online processors except the boot
* processor.
* @retval false Otherwise.
*
* @see _SMP_Before_multitasking_action().
*/
bool _SMP_Before_multitasking_action_broadcast(
SMP_Action_handler handler,
void *arg
);
#endif /* defined( RTEMS_SMP ) */
/**
* @brief Requests a multitasking start on all configured and available
* processors.
*/
#if defined( RTEMS_SMP )
void _SMP_Request_start_multitasking( void );
#else
#define _SMP_Request_start_multitasking() \
do { } while ( 0 )
#endif
/**
* @brief Requests a shutdown of all processors.
*
* This function is a part of the system termination procedure.
*
* @see _Terminate().
*/
#if defined( RTEMS_SMP )
void _SMP_Request_shutdown( void );
#else
#define _SMP_Request_shutdown() \
do { } while ( 0 )
#endif
RTEMS_INLINE_ROUTINE const Processor_mask *_SMP_Get_online_processors( void )
{
#if defined(RTEMS_SMP)
return &_SMP_Online_processors;
#else
return &_Processor_mask_The_one_and_only;
#endif
}
/** @} */
#ifdef __cplusplus
}
#endif
#endif
/* end of include file */
