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/*
* Copyright (c) 2014, 2017 The Linux Foundation. All rights reserved.
*
* Previously licensed under the ISC license by Qualcomm Atheros, Inc.
*
*
* Permission to use, copy, modify, and/or distribute this software for
* any purpose with or without fee is hereby granted, provided that the
* above copyright notice and this permission notice appear in all
* copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
* WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
* AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
/*
* This file was originally distributed by Qualcomm Atheros, Inc.
* under proprietary terms before Copyright ownership was assigned
* to the Linux Foundation.
*/
#if !defined(__CDS_PACK_ALIGN_H)
#define __CDS_PACK_ALIGN_H
/**=========================================================================
\file cds_pack_align.h
\brief Connectivity driver services (CDS) pack and align primitives
Definitions for platform independent means of packing and aligning
data structures
========================================================================*/
/*
Place the macro CDS_PACK_START above a structure declaration to pack. We
are not going to allow modifying the pack size because pack size cannot be
specified in AMSS and GNU. Place the macro CDS_PACK_END below a structure
declaration to stop the pack. This requirement is necessitated by Windows
which need pragma based prolog and epilog.
Pack-size > 1-byte is not supported since gcc and arm do not support that.
Here are some examples
1. Pack-size 1-byte foo_t across all platforms
CDS_PACK_START
typedef CDS_PACK_PRE struct foo_s { ... } CDS_PACK_POST foo_t;
CDS_PACK_END
2. 2-byte alignment for foo_t across all platforms
typedef CDS_ALIGN_PRE(2) struct foo_s { ... } CDS_ALIGN_POST(2) foo_t;
3. Pack-size 1-byte and 2-byte alignment for foo_t across all platforms
CDS_PACK_START
typedef CDS_PACK_PRE CDS_ALIGN_PRE(2) struct foo_s { ... } CDS_ALIGN_POST(2) CDS_PACK_POST foo_t;
CDS_PACK_END
*/
#if defined __GNUC__
#define CDS_PACK_START
#define CDS_PACK_END
#define CDS_PACK_PRE
#define CDS_PACK_POST __attribute__((__packed__))
#define CDS_ALIGN_PRE(__value)
#define CDS_ALIGN_POST(__value) __attribute__((__aligned__(__value)))
#elif defined __arm
#define CDS_PACK_START
#define CDS_PACK_END
#define CDS_PACK_PRE __packed
#define CDS_PACK_POST
#define CDS_ALIGN_PRE(__value) __align(__value)
#define CDS_ALIGN_POST(__value)
#elif defined _MSC_VER
#define CDS_PACK_START __pragma(pack(push, 1))
#define CDS_PACK_END __pragma(pack(pop))
#define CDS_PACK_PRE
#define CDS_PACK_POST
#define CDS_ALIGN_PRE(__value) __declspec(align(__value))
#define CDS_ALIGN_POST(__value)
#else
#error Unsupported compiler!!!
#endif
#endif /* __CDS_PACK_ALIGN_H */
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