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diff --git a/c-user/dual-ported-memory/operations.rst b/c-user/dual-ported-memory/operations.rst new file mode 100644 index 0000000..15efb36 --- /dev/null +++ b/c-user/dual-ported-memory/operations.rst @@ -0,0 +1,44 @@ +.. SPDX-License-Identifier: CC-BY-SA-4.0 + +.. Copyright (C) 1988, 2008 On-Line Applications Research Corporation (OAR) + +Operations +========== + +Creating a Port +--------------- + +The ``rtems_port_create`` directive creates a port into a DPMA with the +user-defined name. The user specifies the association between internal and +external representations for the port being created. RTEMS allocates a +Dual-Ported Memory Control Block (DPCB) from the DPCB free list to maintain the +newly created DPMA. RTEMS also generates a unique dual-ported memory port ID +which is returned to the calling task. RTEMS does not initialize the +dual-ported memory area or access any memory within it. + +Obtaining Port IDs +------------------ + +When a port is created, RTEMS generates a unique port ID and assigns it to the +created port until it is deleted. The port ID may be obtained by either of two +methods. First, as the result of an invocation of the``rtems_port_create`` +directive, the task ID is stored in a user provided location. Second, the port +ID may be obtained later using the ``rtems_port_ident`` directive. The port ID +is used by other dual-ported memory manager directives to access this port. + +Converting an Address +--------------------- + +The ``rtems_port_external_to_internal`` directive is used to convert an address +from external to internal representation for the specified port. The +``rtems_port_internal_to_external`` directive is used to convert an address +from internal to external representation for the specified port. If an attempt +is made to convert an address which lies outside the specified DPMA, then the +address to be converted will be returned. + +Deleting a DPMA Port +-------------------- + +A port can be removed from the system and returned to RTEMS with the +``rtems_port_delete`` directive. When a port is deleted, its control block is +returned to the DPCB free list. |