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[/] [or1k/] [trunk/] [rtems/] [c/] [src/] [exec/] [rtems/] [src/] [dpmemexternal2internal.c] - Rev 1765
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/* * Dual Port Memory Manager * * COPYRIGHT (c) 1989-1999. * 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.OARcorp.com/rtems/license.html. * * $Id: dpmemexternal2internal.c,v 1.2 2001-09-27 11:59:19 chris Exp $ */ #include <rtems/system.h> #include <rtems/rtems/status.h> #include <rtems/rtems/support.h> #include <rtems/score/address.h> #include <rtems/rtems/dpmem.h> #include <rtems/score/object.h> #include <rtems/score/thread.h> #include <rtems/rtems/dpmem.h> /*PAGE * * rtems_port_external_to_internal * * This directive converts an external dual-ported memory address to an * internal dual-ported memory address. If the given external address * is an invalid dual-ported address, then the internal address is set * to the given external address. * * Input parameters: * id - id of dp memory object * external - external address * internal - pointer of internal address to set * * Output parameters: * internal - internal address * RTEMS_SUCCESSFUL - always succeeds */ rtems_status_code rtems_port_external_to_internal( Objects_Id id, void *external, void **internal ) { register Dual_ported_memory_Control *the_port; Objects_Locations location; unsigned32 ending; the_port = _Dual_ported_memory_Get( id, &location ); switch ( location ) { case OBJECTS_REMOTE: /* this error cannot be returned */ return RTEMS_INTERNAL_ERROR; case OBJECTS_ERROR: return RTEMS_INVALID_ID; case OBJECTS_LOCAL: ending = _Addresses_Subtract( external, the_port->external_base ); if ( ending > the_port->length ) *internal = external; else *internal = _Addresses_Add_offset( the_port->internal_base, ending ); _Thread_Enable_dispatch(); return RTEMS_SUCCESSFUL; } return RTEMS_INTERNAL_ERROR; /* unreached - only to remove warnings */ }