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[/] [or1k/] [trunk/] [rtems/] [c/] [src/] [exec/] [rtems/] [src/] [dpmemcreate.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: dpmemcreate.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_create * * This directive creates a port into a dual-ported memory area. * * Input parameters: * name - user defined port name * internal_start - internal start address of port * external_start - external start address of port * length - physical length in bytes * id - address of port id to set * * Output parameters: * id - port id * RTEMS_SUCCESSFUL - if successful * error code - if unsuccessful */ rtems_status_code rtems_port_create( rtems_name name, void *internal_start, void *external_start, unsigned32 length, Objects_Id *id ) { register Dual_ported_memory_Control *the_port; if ( !rtems_is_name_valid( name) ) return RTEMS_INVALID_NAME; if ( !_Addresses_Is_aligned( internal_start ) || !_Addresses_Is_aligned( external_start ) ) return RTEMS_INVALID_ADDRESS; _Thread_Disable_dispatch(); /* to prevent deletion */ the_port = _Dual_ported_memory_Allocate(); if ( !the_port ) { _Thread_Enable_dispatch(); return RTEMS_TOO_MANY; } the_port->internal_base = internal_start; the_port->external_base = external_start; the_port->length = length - 1; _Objects_Open( &_Dual_ported_memory_Information, &the_port->Object, &name ); *id = the_port->Object.id; _Thread_Enable_dispatch(); return RTEMS_SUCCESSFUL; }