CORE/WDI/WPAL/inc/wlan_qct_pack_align.h

/*
 * Copyright (c) 2012-2013 Qualcomm Atheros, Inc.
 * All Rights Reserved.
 * Qualcomm Atheros Confidential and Proprietary.
 */
#if !defined( __WLAN_QCT_PACK_ALIGN_H )
#define __WLAN_QCT_PACK_ALIGN_H

/**=========================================================================
  
  \file  wlan_pack_align.h
  
  \brief pack and align primitives
               
   Definitions for platform independent means of packing and aligning
   data structures
  
   Copyright 2009 (c) Qualcomm, Incorporated.  All Rights Reserved.
   
   Qualcomm Confidential and Proprietary.
  
  ========================================================================*/

/*
 
  Place the macro WPT_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 WPT_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  
  
  WPT_PACK_START
  typedef WPT_PACK_PRE struct foo_s { ... } WPT_PACK_POST foo_t; 
  WPT_PACK_END
  
  2. 2-byte alignment for foo_t across all platforms
  
  typedef WPT_ALIGN_PRE(2) struct foo_s { ... } WPT_ALIGN_POST(2) foo_t; 

  3. Pack-size 1-byte and 2-byte alignment for foo_t across all platforms

  WPT_PACK_START
  typedef WPT_PACK_PRE WPT_ALIGN_PRE(2) struct foo_s { ... } WPT_ALIGN_POST(2) WPT_PACK_POST foo_t; 
  WPT_PACK_END
  
*/

#if defined __GNUC__

   #define WPT_PACK_START 
   #define WPT_PACK_END 

   #define WPT_PACK_PRE 
   #define WPT_PACK_POST  __attribute__((__packed__))

   #define WPT_ALIGN_PRE(__value)
   #define WPT_ALIGN_POST(__value)  __attribute__((__aligned__(__value)))

#elif defined __arm

   #define WPT_PACK_START 
   #define WPT_PACK_END 

   #define WPT_PACK_PRE  __packed
   #define WPT_PACK_POST

   #define WPT_ALIGN_PRE(__value)  __align(__value)
   #define WPT_ALIGN_POST(__value)

#elif defined _MSC_VER

#define WPT_PACK_START  __pragma(pack(push,1))
#define WPT_PACK_END  __pragma(pack(pop))

   #define WPT_PACK_PRE 
   #define WPT_PACK_POST

   #define WPT_ALIGN_PRE(__value)  __declspec(align(__value))
   #define WPT_ALIGN_POST(__value)

#else

   #error Unsupported compiler!!!

#endif

#endif // __WLAN_QCT_PACK_ALIGN_H