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https://github.com/zephyrproject-rtos/zephyr
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2a57d02400
Change-Id: Ia63d6c9d8d3c1bd9c540a039263cb8507af82b1e Signed-off-by: Dan Kalowsky <daniel.kalowsky@intel.com>
89 lines
3.0 KiB
C
89 lines
3.0 KiB
C
/* command_packet.h - command packet header file */
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/*
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* Copyright (c) 2012-2014 Wind River Systems, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/**
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* @brief Microkernel command packet library
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*
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* A command packet is an opaque data structure that maps to a k_args without
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* exposing its innards. It allows a subsystem, like a driver, that needs its
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* fibers or ISRs to communicate with tasks to define a set of such packets to
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* be passed to the isr_xxx routines, such as isr_sem_give(), that, in turn,
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* needs to obtain command packets to interact with the microkernel.
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*
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* Each command packet set is created in global memory using ...
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* CMD_PKT_SET_INSTANCE(set variable name, # of command packets in the set);
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*
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* Once created, the command packet set is referenced as an ordinary structured
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* variable.
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* A command packet set is a simple ring buffer. No error checking is performed
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* when a command packet is retrieved from the set. Each obtained command packet
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* is implicitly released once the command packet has been processed. Thus, it is
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* important that each command packet be processed in a near-FIFO order to prevent
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* corruption of command packets that are already in use. To this end, drivers
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* that have an ISR component should use their own command packet set.
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*/
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#ifndef _COMMAND_PACKET_H
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#define _COMMAND_PACKET_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <microkernel/base_api.h>
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/* define size of command packet (without exposing its internal structure) */
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#define CMD_PKT_SIZE_IN_WORDS (19)
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/* define command packet set types */
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typedef uint32_t cmdPkt_t[CMD_PKT_SIZE_IN_WORDS];
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struct cmd_pkt_set {
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uint32_t num_packets; /* number of command packets in set */
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uint32_t index; /* index into command packet array */
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cmdPkt_t *command_packet; /* pointer to array of command packets */
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};
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/**
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* @brief Define a command packet set
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*
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* This macro is used to create a command packet set of the specified size.
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*
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* @param name Name of command packet set
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* @param num Number of packets in the set
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*
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* @warning The command packet set exists in the global namespace,
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* and cannot be hidden by prefixing the macro with "static".
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*/
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#define CMD_PKT_SET_INSTANCE(name, num) \
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uint32_t __noinit(_k_cmd_pkts_ ## name)[CMD_PKT_SIZE_IN_WORDS * (num)]; \
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struct cmd_pkt_set name = {(num), 0, (cmdPkt_t *)(_k_cmd_pkts_ ## name)}
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/* externs */
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extern struct k_args *_cmd_pkt_get(struct cmd_pkt_set *pSet);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _COMMAND_PACKET_H */
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