f7fffae8aa
Change all the Intel and Wind River code license from BSD-3 to Apache 2. Change-Id: Id8be2c1c161a06ea8a0b9f38e17660e11dbb384b Signed-off-by: Javier B Perez Hernandez <javier.b.perez.hernandez@linux.intel.com> Signed-off-by: Anas Nashif <anas.nashif@intel.com> Signed-off-by: Allan Stephens <allan.stephens@windriver.com> Signed-off-by: Benjamin Walsh <benjamin.walsh@windriver.com>
102 lines
3.3 KiB
C
102 lines
3.3 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 accessed using ...
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* CMD_PKT_SET(set variable name).<member field name>
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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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/**
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* @brief Define a command packet set
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*
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*
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* This macro is used to create a command packet set in the global namespace.
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* Each packet set can have a different number of packets.
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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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* @internal
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* It is critical that the word corresponding to the [alloc] field in the
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* equivalent struct k_args command packet be zero so that the system knows that the
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* command packet is not part of the free list.
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* @endinternal
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*/
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#define CMD_PKT_SET_INSTANCE(name, num) \
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uint32_t name[2 + CMD_PKT_SIZE_IN_WORDS * (num)] = {num, 0}
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/**
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* @brief Wrapper for accessing a command packet set
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*
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* A command packet set must be typecast to the cmd_pkt_set type
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* when accessed, because it is instantiated as an array of uint32_t.
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*
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* @param name Name of command packet set
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*
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*/
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#define CMD_PKT_SET(name) (*(struct cmd_pkt_set *)(name))
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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[]; /* array of command packets */
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};
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/* externs */
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extern cmdPkt_t *_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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