/**
* @file
*
* @brief Multiprocessing Communications Interface (MPCI) Handler
* @ingroup ScoreMPCI
*/
/*
* COPYRIGHT (c) 1989-2014.
* 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.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/score/mpciimpl.h>
#include <rtems/score/coresemimpl.h>
#include <rtems/score/interr.h>
#include <rtems/score/stackimpl.h>
#include <rtems/score/sysstate.h>
#include <rtems/score/schedulerimpl.h>
#include <rtems/score/threadimpl.h>
#include <rtems/score/threadqimpl.h>
#include <rtems/config.h>
RTEMS_STATIC_ASSERT(
sizeof(MPCI_Internal_packet) <= MP_PACKET_MINIMUM_PACKET_SIZE,
MPCI_Internal_packet
);
/**
* This is the core semaphore which the MPCI Receive Server blocks on.
*/
CORE_semaphore_Control _MPCI_Semaphore;
void _MPCI_Handler_initialization(
uint32_t timeout_status
)
{
CORE_semaphore_Attributes attributes;
MPCI_Control *users_mpci_table;
users_mpci_table = _Configuration_MP_table->User_mpci_table;
if ( _System_state_Is_multiprocessing && !users_mpci_table )
_Terminate(
INTERNAL_ERROR_CORE,
true,
INTERNAL_ERROR_NO_MPCI
);
_MPCI_table = users_mpci_table;
if ( !_System_state_Is_multiprocessing )
return;
/*
* Register the MP Process Packet routine.
*/
_MPCI_Register_packet_processor(
MP_PACKET_MPCI_INTERNAL,
_MPCI_Internal_packets_Process_packet
);
/*
* Create the counting semaphore used by the MPCI Receive Server.
*/
attributes.discipline = CORE_SEMAPHORE_DISCIPLINES_FIFO;
_CORE_semaphore_Initialize(
&_MPCI_Semaphore,
&attributes, /* the_semaphore_attributes */
0 /* initial_value */
);
_Thread_queue_Initialize(
&_MPCI_Remote_blocked_threads,
THREAD_QUEUE_DISCIPLINE_FIFO,
STATES_WAITING_FOR_RPC_REPLY,
timeout_status
);
}
void _MPCI_Create_server( void )
{
Objects_Name name;
if ( !_System_state_Is_multiprocessing )
return;
/*
* Initialize the MPCI Receive Server
*/
_MPCI_Receive_server_tcb = _Thread_Internal_allocate();
name.name_u32 = _Objects_Build_name( 'M', 'P', 'C', 'I' );
_Thread_Initialize(
&_Thread_Internal_information,
_MPCI_Receive_server_tcb,
_Scheduler_Get_by_CPU_index( _SMP_Get_current_processor() ),
NULL, /* allocate the stack */
_Stack_Minimum() +
CPU_MPCI_RECEIVE_SERVER_EXTRA_STACK +
_Configuration_MP_table->extra_mpci_receive_server_stack,
CPU_ALL_TASKS_ARE_FP,
PRIORITY_MINIMUM,
false, /* no preempt */
THREAD_CPU_BUDGET_ALGORITHM_NONE,
NULL, /* no budget algorithm callout */
0, /* all interrupts enabled */
name
);
_Thread_Start(
_MPCI_Receive_server_tcb,
THREAD_START_NUMERIC,
(void *) _MPCI_Receive_server,
NULL,
0,
NULL
);
}
void _MPCI_Initialization ( void )
{
(*_MPCI_table->initialization)();
}
void _MPCI_Register_packet_processor(
MP_packet_Classes the_class,
MPCI_Packet_processor the_packet_processor
)
{
_MPCI_Packet_processors[ the_class ] = the_packet_processor;
}
MP_packet_Prefix *_MPCI_Get_packet ( void )
{
MP_packet_Prefix *the_packet;
(*_MPCI_table->get_packet)( &the_packet );
if ( the_packet == NULL )
_Terminate(
INTERNAL_ERROR_CORE,
true,
INTERNAL_ERROR_OUT_OF_PACKETS
);
/*
* Put in a default timeout that will be used for
* all packets that do not otherwise have a timeout.
*/
the_packet->timeout = MPCI_DEFAULT_TIMEOUT;
return the_packet;
}
void _MPCI_Return_packet (
MP_packet_Prefix *the_packet
)
{
(*_MPCI_table->return_packet)( the_packet );
}
void _MPCI_Send_process_packet (
uint32_t destination,
MP_packet_Prefix *the_packet
)
{
the_packet->source_tid = _Thread_Executing->Object.id;
the_packet->to_convert =
( the_packet->to_convert - sizeof(MP_packet_Prefix) ) / sizeof(uint32_t);
(*_MPCI_table->send_packet)( destination, the_packet );
}
uint32_t _MPCI_Send_request_packet (
uint32_t destination,
MP_packet_Prefix *the_packet,
States_Control extra_state
)
{
Thread_Control *executing = _Thread_Executing;
the_packet->source_tid = executing->Object.id;
the_packet->source_priority = executing->current_priority;
the_packet->to_convert =
( the_packet->to_convert - sizeof(MP_packet_Prefix) ) / sizeof(uint32_t);
executing->Wait.id = the_packet->id;
executing->Wait.queue = &_MPCI_Remote_blocked_threads;
_Thread_Disable_dispatch();
(*_MPCI_table->send_packet)( destination, the_packet );
_Thread_queue_Enter_critical_section( &_MPCI_Remote_blocked_threads );
/*
* See if we need a default timeout
*/
if (the_packet->timeout == MPCI_DEFAULT_TIMEOUT)
the_packet->timeout = _MPCI_table->default_timeout;
_Thread_queue_Enqueue(
&_MPCI_Remote_blocked_threads,
executing,
the_packet->timeout
);
executing->current_state =
_States_Set( extra_state, executing->current_state );
_Thread_Enable_dispatch();
return executing->Wait.return_code;
}
void _MPCI_Send_response_packet (
uint32_t destination,
MP_packet_Prefix *the_packet
)
{
the_packet->source_tid = _Thread_Executing->Object.id;
(*_MPCI_table->send_packet)( destination, the_packet );
}
MP_packet_Prefix *_MPCI_Receive_packet ( void )
{
MP_packet_Prefix *the_packet;
(*_MPCI_table->receive_packet)( &the_packet );
return the_packet;
}
Thread_Control *_MPCI_Process_response (
MP_packet_Prefix *the_packet
)
{
Thread_Control *the_thread;
Objects_Locations location;
the_thread = _Thread_Get( the_packet->id, &location );
switch ( location ) {
case OBJECTS_ERROR:
#if defined(RTEMS_MULTIPROCESSING)
case OBJECTS_REMOTE:
#endif
the_thread = NULL; /* IMPOSSIBLE */
break;
case OBJECTS_LOCAL:
_Thread_queue_Extract( &_MPCI_Remote_blocked_threads, the_thread );
the_thread->Wait.return_code = the_packet->return_code;
_Objects_Put_without_thread_dispatch( &the_thread->Object );
break;
}
return the_thread;
}
/*
* _MPCI_Receive_server
*
*/
Thread _MPCI_Receive_server(
uint32_t ignored
)
{
MP_packet_Prefix *the_packet;
MPCI_Packet_processor the_function;
Thread_Control *executing;
executing = _Thread_Get_executing();
for ( ; ; ) {
executing->receive_packet = NULL;
_Thread_Disable_dispatch();
_CORE_semaphore_Seize(
&_MPCI_Semaphore,
executing,
0,
true,
WATCHDOG_NO_TIMEOUT
);
_Thread_Enable_dispatch();
for ( ; ; ) {
the_packet = _MPCI_Receive_packet();
if ( !the_packet )
break;
executing->receive_packet = the_packet;
if ( !_Mp_packet_Is_valid_packet_class ( the_packet->the_class ) )
break;
the_function = _MPCI_Packet_processors[ the_packet->the_class ];
if ( !the_function )
_Terminate(
INTERNAL_ERROR_CORE,
true,
INTERNAL_ERROR_BAD_PACKET
);
(*the_function)( the_packet );
}
}
return 0; /* unreached - only to remove warnings */
}
void _MPCI_Announce ( void )
{
_Thread_Disable_dispatch();
(void) _CORE_semaphore_Surrender( &_MPCI_Semaphore, 0, 0 );
_Thread_Enable_dispatch();
}
void _MPCI_Internal_packets_Send_process_packet (
MPCI_Internal_Remote_operations operation
)
{
MPCI_Internal_packet *the_packet;
switch ( operation ) {
case MPCI_PACKETS_SYSTEM_VERIFY:
the_packet = _MPCI_Internal_packets_Get_packet();
the_packet->Prefix.the_class = MP_PACKET_MPCI_INTERNAL;
the_packet->Prefix.length = sizeof ( MPCI_Internal_packet );
the_packet->Prefix.to_convert = sizeof ( MPCI_Internal_packet );
the_packet->operation = operation;
the_packet->maximum_nodes = _Objects_Maximum_nodes;
the_packet->maximum_global_objects = _Objects_MP_Maximum_global_objects;
_MPCI_Send_process_packet( MPCI_ALL_NODES, &the_packet->Prefix );
break;
}
}
/*
* _MPCI_Internal_packets_Send_request_packet
*
* This subprogram is not needed since there are no request
* packets to be sent by this manager.
*
*/
/*
* _MPCI_Internal_packets_Send_response_packet
*
* This subprogram is not needed since there are no response
* packets to be sent by this manager.
*
*/
void _MPCI_Internal_packets_Process_packet (
MP_packet_Prefix *the_packet_prefix
)
{
MPCI_Internal_packet *the_packet;
uint32_t maximum_nodes;
uint32_t maximum_global_objects;
the_packet = (MPCI_Internal_packet *) the_packet_prefix;
switch ( the_packet->operation ) {
case MPCI_PACKETS_SYSTEM_VERIFY:
maximum_nodes = the_packet->maximum_nodes;
maximum_global_objects = the_packet->maximum_global_objects;
if ( maximum_nodes != _Objects_Maximum_nodes ||
maximum_global_objects != _Objects_MP_Maximum_global_objects ) {
_MPCI_Return_packet( the_packet_prefix );
_Terminate(
INTERNAL_ERROR_CORE,
true,
INTERNAL_ERROR_INCONSISTENT_MP_INFORMATION
);
}
_MPCI_Return_packet( the_packet_prefix );
break;
}
}
/*
* _MPCI_Internal_packets_Send_object_was_deleted
*
* This subprogram is not needed since there are no objects
* deleted by this manager.
*
*/
/*
* _MPCI_Internal_packets_Send_extract_proxy
*
* This subprogram is not needed since there are no objects
* deleted by this manager.
*
*/
MPCI_Internal_packet *_MPCI_Internal_packets_Get_packet ( void )
{
return ( (MPCI_Internal_packet *) _MPCI_Get_packet() );
}
/* end of file */
