diff options
Diffstat (limited to 'cpukit/rtems/src/dpmemcreate.c')
-rw-r--r-- | cpukit/rtems/src/dpmemcreate.c | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/cpukit/rtems/src/dpmemcreate.c b/cpukit/rtems/src/dpmemcreate.c new file mode 100644 index 0000000000..69df430dd8 --- /dev/null +++ b/cpukit/rtems/src/dpmemcreate.c @@ -0,0 +1,88 @@ +/* + * 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.rtems.com/license/LICENSE. + * + * $Id$ + */ + +#if HAVE_CONFIG_H +#include "config.h" +#endif + +#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, + uint32_t length, + rtems_id *id +) +{ + register Dual_ported_memory_Control *the_port; + + if ( !rtems_is_name_valid( name ) ) + return RTEMS_INVALID_NAME; + + if ( !id ) + return RTEMS_INVALID_ADDRESS; + + 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, + (Objects_Name) name + ); + + *id = the_port->Object.id; + _Thread_Enable_dispatch(); + return RTEMS_SUCCESSFUL; +} |