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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [exec/] [rtems/] [src/] [dpmemcreate.c] - Blame information for rev 173

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/*
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 *  Dual Port Memory Manager
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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.OARcorp.com/rtems/license.html.
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 *
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 *  $Id: dpmemcreate.c,v 1.2 2001-09-27 11:59:19 chris Exp $
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 */
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#include <rtems/system.h>
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#include <rtems/rtems/status.h>
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#include <rtems/rtems/support.h>
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#include <rtems/score/address.h>
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#include <rtems/rtems/dpmem.h>
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#include <rtems/score/object.h>
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#include <rtems/score/thread.h>
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#include <rtems/rtems/dpmem.h>
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/*PAGE
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 *
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 *  rtems_port_create
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 *
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 *  This directive creates a port into a dual-ported memory area.
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 *
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 *  Input parameters:
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 *    name           - user defined port name
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 *    internal_start - internal start address of port
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 *    external_start - external start address of port
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 *    length         - physical length in bytes
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 *    id             - address of port id to set
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 *
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 *  Output parameters:
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 *    id       - port id
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 *    RTEMS_SUCCESSFUL - if successful
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 *    error code - if unsuccessful
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 */
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rtems_status_code rtems_port_create(
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  rtems_name    name,
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  void         *internal_start,
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  void         *external_start,
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  unsigned32    length,
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  Objects_Id   *id
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)
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{
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  register Dual_ported_memory_Control *the_port;
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  if ( !rtems_is_name_valid( name) )
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    return RTEMS_INVALID_NAME;
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  if ( !_Addresses_Is_aligned( internal_start ) ||
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       !_Addresses_Is_aligned( external_start ) )
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    return RTEMS_INVALID_ADDRESS;
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  _Thread_Disable_dispatch();             /* to prevent deletion */
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  the_port = _Dual_ported_memory_Allocate();
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  if ( !the_port ) {
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    _Thread_Enable_dispatch();
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    return RTEMS_TOO_MANY;
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  }
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  the_port->internal_base = internal_start;
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  the_port->external_base = external_start;
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  the_port->length        = length - 1;
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  _Objects_Open(
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    &_Dual_ported_memory_Information,
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    &the_port->Object,
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    &name
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  );
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  *id = the_port->Object.id;
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  _Thread_Enable_dispatch();
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  return RTEMS_SUCCESSFUL;
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}

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