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/**
* @file
*
* @ingroup ScoreSMPImpl
*
* @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/fatal.h>
#ifdef __cplusplus
extern "C" {
#endif
/**
* @defgroup ScoreSMP SMP Support
*
* @ingroup Score
*
* 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 UINT32_C(0x1)
/**
* @brief SMP fatal codes.
*/
typedef enum {
SMP_FATAL_SHUTDOWN,
SMP_FATAL_SHUTDOWN_EARLY
} SMP_Fatal_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 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.
*/
void _SMP_Start_multitasking_on_secondary_processor( void )
RTEMS_COMPILER_NO_RETURN_ATTRIBUTE;
/**
* @brief Interrupt handler for inter-processor interrupts.
*/
static inline void _SMP_Inter_processor_interrupt_handler( void )
{
Per_CPU_Control *self_cpu = _Per_CPU_Get();
if ( self_cpu->message != 0 ) {
uint32_t message;
ISR_Level level;
_Per_CPU_ISR_disable_and_acquire( self_cpu, level );
message = self_cpu->message;
self_cpu->message = 0;
_Per_CPU_Release_and_ISR_enable( self_cpu, level );
if ( ( message & SMP_MESSAGE_SHUTDOWN ) != 0 ) {
rtems_fatal( RTEMS_FATAL_SOURCE_SMP, SMP_FATAL_SHUTDOWN );
/* does not continue past here */
}
}
}
/**
* @brief Sends a SMP message to a processor.
*
* The target processor may be the sending processor.
*
* @param[in] cpu The target processor of the message.
* @param[in] message The message.
*/
void _SMP_Send_message( uint32_t cpu, uint32_t message );
/**
* @brief Request of others CPUs.
*
* 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
*/
void _SMP_Broadcast_message(
uint32_t message
);
#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
/** @} */
#ifdef __cplusplus
}
#endif
#endif
/* end of include file */
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