forked from Imagelibrary/rtems
249 lines
6.8 KiB
C
249 lines
6.8 KiB
C
/* Shm_Initialization
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*
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* This routine is the shared memory communications initerface
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* driver initialization routine.
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*
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* Input parameters: NONE
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*
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* Output parameters: NONE
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*
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* COPYRIGHT (c) 1989-1999.
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* On-Line Applications Research Corporation (OAR).
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.org/license/LICENSE.
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*/
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#define _SHM_INIT
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#include <rtems.h>
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#include <shm_driver.h>
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#include <string.h> /* memset() */
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#include <stdlib.h> /* malloc() */
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#include <assert.h>
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/*
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* User extension to install MPCI_Fatal as a fatal error
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* handler extension
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*/
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rtems_extensions_table MPCI_Shm_extensions;
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/*
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* MP configuration table from confdefs.h
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*/
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rtems_mpci_entry Shm_Initialization( void )
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{
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uint32_t i, all_initialized;
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uint32_t interrupt_cause, interrupt_value;
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void *interrupt_address;
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Shm_Node_status_control *nscb;
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uint32_t extension_id; /* for installation of MPCI_Fatal */
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uint32_t remaining_memory;
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uint32_t local_node;
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local_node = _Configuration_MP_table->node;
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Shm_Get_configuration( local_node, &Shm_Configuration );
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Shm_Interrupt_table = (Shm_Interrupt_information *) malloc(
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sizeof(Shm_Interrupt_information) * (SHM_MAXIMUM_NODES + 1)
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);
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assert( Shm_Interrupt_table );
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Shm_Receive_message_count = 0;
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Shm_Null_message_count = 0;
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Shm_Interrupt_count = 0;
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/*
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* Set the Node Status indicators
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*/
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Shm_Pending_initialization =
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Shm_Convert(rtems_build_name( 'P', 'E', 'N', 'D' ));
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Shm_Initialization_complete =
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Shm_Convert(rtems_build_name( 'C', 'O', 'M', 'P' ));
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Shm_Active_node =
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Shm_Convert(rtems_build_name( 'A', 'C', 'T', 'V' ));
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/*
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* Initialize the constants used by the Locked Queue code.
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*/
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Shm_Locked_queue_End_of_list = Shm_Convert( 0xffffffff );
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Shm_Locked_queue_Not_on_list = Shm_Convert( 0xfffffffe );
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/*
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* Set the base addresses for the:
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* + Node Status Table
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* + Free Pool and Receive Queues
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* + Envelopes
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*/
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Shm_Node_statuses = (Shm_Node_status_control *) START_NS_CBS;
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Shm_Locked_queues = (Shm_Locked_queue_Control *) START_LQ_CBS;
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Shm_Envelopes = (Shm_Envelope_control *) START_ENVELOPES;
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/*
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* Calculate the maximum number of envelopes which can be
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* placed the remaining shared memory.
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*/
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remaining_memory =
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((void *)Shm_Configuration->base + Shm_Configuration->length) -
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((void *)Shm_Envelopes);
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Shm_Maximum_envelopes = remaining_memory / sizeof( Shm_Envelope_control );
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Shm_Maximum_envelopes -= 1;
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/*
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* Set the pointer to the receive queue for the local node.
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* When we receive a node, we will get it from here before
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* processing it.
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*/
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Shm_Local_receive_queue = &Shm_Locked_queues[ local_node ];
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Shm_Local_node_status = &Shm_Node_statuses[ local_node ];
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/*
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* Convert local interrupt cause information into the
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* neutral format so other nodes will be able to
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* understand it.
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*/
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interrupt_address =
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(void *) Shm_Convert( (uint32_t)Shm_Configuration->Intr.address );
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interrupt_value = Shm_Convert( Shm_Configuration->Intr.value );
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interrupt_cause = Shm_Convert( Shm_Configuration->Intr.length );
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if ( Shm_Configuration->poll_intr == POLLED_MODE ) Shm_install_timer();
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else Shm_setvec();
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if ( Shm_Is_master_node() ) {
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/*
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* Zero out the shared memory area.
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*/
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(void) memset(
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(void *) Shm_Configuration->base,
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0,
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Shm_Configuration->length
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);
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/*
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* Initialize all of the locked queues (the free envelope
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* pool and a receive queue per node) and set all of the
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* node's status so they will be waiting to initialization
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* to complete.
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*/
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Shm_Locked_queue_Initialize( FREE_ENV_CB, FREE_ENV_POOL );
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for ( i=SHM_FIRST_NODE ; i<=SHM_MAXIMUM_NODES ; i++ ) {
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Shm_Initialize_receive_queue( i );
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Shm_Node_statuses[ i ].status = Shm_Pending_initialization;
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Shm_Node_statuses[ i ].error = 0;
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}
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/*
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* Initialize all of the envelopes and place them in the
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* free pool.
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*/
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for ( i=0 ; i<Shm_Maximum_envelopes ; i++ ) {
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Shm_Envelopes[ i ].index = Shm_Convert(i);
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Shm_Free_envelope( &Shm_Envelopes[ i ] );
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}
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/*
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* Initialize this node's interrupt information in the
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* shared area so other nodes can interrupt us.
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*/
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Shm_Local_node_status->int_address = (uint32_t) interrupt_address;
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Shm_Local_node_status->int_value = interrupt_value;
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Shm_Local_node_status->int_length = interrupt_cause;
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Shm_Local_node_status->status = Shm_Initialization_complete;
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/*
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* Loop until all nodes have completed initialization.
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*/
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do {
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all_initialized = 1;
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for ( i = SHM_FIRST_NODE ; i <= SHM_MAXIMUM_NODES ; i++ )
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if ( Shm_Node_statuses[ i ].status != Shm_Initialization_complete )
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all_initialized = 0;
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} while ( all_initialized == 0 );
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/*
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* Tell the other nodes we think that the system is up.
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*/
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for ( i = SHM_FIRST_NODE ; i <= SHM_MAXIMUM_NODES ; i++ )
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Shm_Node_statuses[ i ].status = Shm_Active_node;
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} else { /* is not MASTER node */
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/*
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* Initialize the node status for the non-master nodes.
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* Because the master node zeroes out memory, it is
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* necessary for them to keep putting their values in
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* the node status area until the master says they
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* should become active.
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*/
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Shm_Local_node_status->status = Shm_Pending_initialization;
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do {
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if ( Shm_Local_node_status->status == Shm_Pending_initialization ) {
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/*
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* Initialize this node's interrupt information in the
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* shared area so other nodes can interrupt us.
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*/
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Shm_Local_node_status->int_address =
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(uint32_t) interrupt_address;
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Shm_Local_node_status->int_value = interrupt_value;
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Shm_Local_node_status->int_length = interrupt_cause;
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Shm_Local_node_status->status = Shm_Initialization_complete;
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}
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} while ( Shm_Local_node_status->status != Shm_Active_node ) ;
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}
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/*
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* Initialize the Interrupt Information Table
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*/
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for ( i = SHM_FIRST_NODE ; i <= SHM_MAXIMUM_NODES ; i++ ) {
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nscb = &Shm_Node_statuses[ i ];
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Shm_Interrupt_table[i].address = Shm_Convert_address(
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(void *)Shm_Convert(((vol_u32) nscb->int_address))
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);
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Shm_Interrupt_table[i].value = Shm_Convert( nscb->int_value );
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Shm_Interrupt_table[i].length = Shm_Convert( nscb->int_length );
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}
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MPCI_Shm_extensions.fatal = MPCI_Fatal;
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(void) rtems_extension_create(
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rtems_build_name( 'M', 'P', 'E', 'X' ),
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&MPCI_Shm_extensions,
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&extension_id
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);
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}
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