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/*
* Multiprocessing Communications Interface (MPCI) Handler
*
*
* COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994.
* On-Line Applications Research Corporation (OAR).
* All rights assigned to U.S. Government, 1994.
*
* This material may be reproduced by or for the U.S. Government pursuant
* to the copyright license under the clause at DFARS 252.227-7013. This
* notice must appear in all copies of this file and its derivatives.
*
* $Id$
*/
#include <rtems/system.h>
#include <rtems/config.h>
#include <rtems/cpu.h>
#include <rtems/fatal.h>
#include <rtems/mpci.h>
#include <rtems/mppkt.h>
#include <rtems/states.h>
#include <rtems/thread.h>
#include <rtems/threadq.h>
#include <rtems/tqdata.h>
#include <rtems/watchdog.h>
/*PAGE
*
* _MPCI_Handler_initialization
*
* This subprogram performs the initialization necessary for this handler.
*/
void _MPCI_Handler_initialization ( void )
{
_Thread_queue_Initialize(
&_MPCI_Remote_blocked_threads,
RTEMS_FIFO,
STATES_WAITING_FOR_RPC_REPLY
);
}
/*PAGE
*
* _MPCI_Initialization
*
* This subprogram initializes the MPCI driver by
* invoking the user provided MPCI initialization callout.
*/
void _MPCI_Initialization ( void )
{
(*_Configuration_MPCI_table->initialization)(
_Configuration_Table,
&_CPU_Table,
_Configuration_MP_table
);
}
/*PAGE
*
* _MPCI_Get_packet
*
* This subprogram obtains a packet by invoking the user provided
* MPCI get packet callout.
*/
rtems_packet_prefix *_MPCI_Get_packet ( void )
{
rtems_packet_prefix *the_packet;
(*_Configuration_MPCI_table->get_packet)( &the_packet );
if ( the_packet == NULL )
rtems_fatal_error_occurred( RTEMS_UNSATISFIED );
/*
* 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;
}
/*PAGE
*
* _MPCI_Return_packet
*
* This subprogram returns a packet by invoking the user provided
* MPCI return packet callout.
*/
void _MPCI_Return_packet (
rtems_packet_prefix *the_packet
)
{
(*_Configuration_MPCI_table->return_packet)( the_packet );
}
/*PAGE
*
* _MPCI_Send_process_packet
*
* This subprogram sends a process packet by invoking the user provided
* MPCI send callout.
*/
void _MPCI_Send_process_packet (
unsigned32 destination,
rtems_packet_prefix *the_packet
)
{
the_packet->source_tid = _Thread_Executing->Object.id;
the_packet->to_convert =
( the_packet->to_convert - sizeof(rtems_packet_prefix) ) /
sizeof(unsigned32);
(*_Configuration_MPCI_table->send_packet)( destination, the_packet );
}
/*PAGE
*
* _MPCI_Send_request_packet
*
* This subprogram sends a request packet by invoking the user provided
* MPCI send callout.
*/
rtems_status_code _MPCI_Send_request_packet (
unsigned32 destination,
rtems_packet_prefix *the_packet,
States_Control extra_state
)
{
the_packet->source_tid = _Thread_Executing->Object.id;
the_packet->source_priority = _Thread_Executing->current_priority;
the_packet->to_convert =
( the_packet->to_convert - sizeof(rtems_packet_prefix) ) /
sizeof(unsigned32);
_Thread_Executing->Wait.id = the_packet->id;
_Thread_Executing->Wait.queue = &_MPCI_Remote_blocked_threads;
_Thread_Disable_dispatch();
(*_Configuration_MPCI_table->send_packet)( destination, the_packet );
_MPCI_Remote_blocked_threads.sync = TRUE;
/*
* See if we need a default timeout
*/
if (the_packet->timeout == MPCI_DEFAULT_TIMEOUT)
the_packet->timeout = _Configuration_MPCI_table->default_timeout;
_Thread_queue_Enqueue( &_MPCI_Remote_blocked_threads, the_packet->timeout );
_Thread_Executing->current_state =
_States_Set( extra_state, _Thread_Executing->current_state );
_Thread_Enable_dispatch();
return _Thread_Executing->Wait.return_code;
}
/*PAGE
*
* _MPCI_Send_response_packet
*
* This subprogram sends a response packet by invoking the user provided
* MPCI send callout.
*/
void _MPCI_Send_response_packet (
unsigned32 destination,
rtems_packet_prefix *the_packet
)
{
the_packet->source_tid = _Thread_Executing->Object.id;
(*_Configuration_MPCI_table->send_packet)( destination, the_packet );
}
/*PAGE
*
* _MPCI_Receive_packet
*
* This subprogram receives a packet by invoking the user provided
* MPCI receive callout.
*/
rtems_packet_prefix *_MPCI_Receive_packet ( void )
{
rtems_packet_prefix *the_packet;
(*_Configuration_MPCI_table->receive_packet)( &the_packet );
return the_packet;
}
/*PAGE
*
* _MPCI_Process_response
*
* This subprogram obtains a packet by invoking the user provided
* MPCI get packet callout.
*/
Thread_Control *_MPCI_Process_response (
rtems_packet_prefix *the_packet
)
{
Thread_Control *the_thread;
Objects_Locations location;
the_thread = _Thread_Get( the_packet->id, &location );
switch ( location ) {
case OBJECTS_ERROR:
case OBJECTS_REMOTE:
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;
_Thread_Unnest_dispatch();
break;
}
return the_thread;
}
/* end of file */
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