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Diffstat (limited to 'cpukit/include/rtems/rtems/dpmem.h')
| -rw-r--r-- | cpukit/include/rtems/rtems/dpmem.h | 179 |
1 files changed, 179 insertions, 0 deletions
diff --git a/cpukit/include/rtems/rtems/dpmem.h b/cpukit/include/rtems/rtems/dpmem.h new file mode 100644 index 0000000000..e582d2d359 --- /dev/null +++ b/cpukit/include/rtems/rtems/dpmem.h @@ -0,0 +1,179 @@ +/** + * @file rtems/rtems/dpmem.h + * + * @defgroup ClassicDPMEM Dual Ported Memory + * + * @ingroup ClassicRTEMS + * @brief Dual Ported Memory Manager + * + * This include file contains all the constants and structures associated + * with the Dual Ported Memory Manager. This manager provides a mechanism + * for converting addresses between internal and external representations + * for multiple dual-ported memory areas. + * + * Directives provided are: + * + * - create a port + * - get ID of a port + * - delete a port + * - convert external to internal address + * - convert internal to external address + * + */ + +/* COPYRIGHT (c) 1989-2008. + * 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.org/license/LICENSE. + */ + +#ifndef _RTEMS_RTEMS_DPMEM_H +#define _RTEMS_RTEMS_DPMEM_H + +#include <rtems/rtems/types.h> +#include <rtems/rtems/status.h> + +#ifdef __cplusplus +extern "C" { +#endif + +/** + * @defgroup ClassicDPMEM Dual Ported Memory + * + * @ingroup ClassicRTEMS + * + * This encapsulates functionality related to the + * Classic API Dual Ported Memory Manager. + */ +/**@{*/ + +/** + * The following structure defines the port control block. Each port + * has a control block associated with it. This control block contains + * all information required to support the port related operations. + */ +typedef struct { + /** This field is the object management portion of a Port instance. */ + Objects_Control Object; + /** This field is the base internal address of the port. */ + void *internal_base; + /** This field is the base external address of the port. */ + void *external_base; + /** This field is the length of dual-ported area of the port. */ + uint32_t length; +} Dual_ported_memory_Control; + +/** + * @brief Creates a port into a dual-ported memory area. + * + * This routine implements the rtems_port_create directive. The port + * will have the name @a name. The port maps onto an area of dual ported + * memory of length bytes which has internal_start and external_start + * as the internal and external starting addresses, respectively. + * It returns the id of the created port in ID. + * + * @param[in] name is the user defined port name + * @param[in] internal_start is the internal start address of port + * @param[in] external_start is the external start address of port + * @param[in] length is the physical length in bytes + * @param[out] id is the address of port id to set + * + * @retval This method returns RTEMS_SUCCESSFUL if there was not an + * error. Otherwise, a status code is returned indicating the + * source of the error. If successful, the id will + * be filled in with the port id. + */ +rtems_status_code rtems_port_create( + rtems_name name, + void *internal_start, + void *external_start, + uint32_t length, + rtems_id *id +); + +/** + * @brief RTEMS Port Name to Id + * + * This routine implements the rtems_port_ident directive. This directive + * returns the port ID associated with name. If more than one port is + * named name, then the port to which the ID belongs is arbitrary. + * + * @param[in] name is the user defined port name + * @param[out] id is the pointer to port id + * + * @retval RTEMS_SUCCESSFUL if successful or error code if unsuccessful + */ +rtems_status_code rtems_port_ident( + rtems_name name, + rtems_id *id +); + +/** + * @brief RTEMS Delete Port + * + * This routine implements the rtems_port_delete directive. It deletes + * the port associated with ID. + * + * @param[in] id is the dual-ported memory area id + * + * @retval This method returns RTEMS_SUCCESSFUL if there was not an + * error. Otherwise, a status code is returned indicating the + * source of the error. + */ +rtems_status_code rtems_port_delete( + rtems_id id +); + +/** + * @brief RTEMS Port External to Internal + * + * This routine implements the rtems_port_external_to_internal directive. + * It returns the internal port address which maps to the provided + * external port address for the specified port ID. If the given external + * address is an invalid dual-ported address, then the internal address is + * set to the given external address. + * + * @param[in] id is the id of dp memory object + * @param[in] external is the external address + * @param[out] internal is the pointer of internal address to set + * + * @retval RTEMS_SUCCESSFUL + */ +rtems_status_code rtems_port_external_to_internal( + rtems_id id, + void *external, + void **internal +); + +/** + * @brief RTEMS Port Internal to External + * + * This routine implements the Port_internal_to_external directive. + * It returns the external port address which maps to the provided + * internal port address for the specified port ID. If the given + * internal address is an invalid dual-ported address, then the + * external address is set to the given internal address. + * + * @param[in] id is the id of dual-ported memory object + * @param[in] internal is the internal address to set + * @param[in] external is the pointer to external address + * + * @retval RTEMS_SUCCESSFUL and the external will be filled in + * with the external addresses + */ +rtems_status_code rtems_port_internal_to_external( + rtems_id id, + void *internal, + void **external +); + +/**@}*/ + +#ifdef __cplusplus +} +#endif + +#endif +/* end of include file */ |