SIM card related Projects » SIMtrace

/*

	FreeRTOS.org V4.2.1 - Copyright (C) 2003-2007 Richard Barry.

	This file is part of the FreeRTOS.org distribution.

	FreeRTOS.org is free software; you can redistribute it and/or modify

	it under the terms of the GNU General Public License as published by

	the Free Software Foundation; either version 2 of the License, or

	(at your option) any later version.

	FreeRTOS.org is distributed in the hope that it will be useful,

	but WITHOUT ANY WARRANTY; without even the implied warranty of

	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License

	along with FreeRTOS.org; if not, write to the Free Software

	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

	A special exception to the GPL can be applied should you wish to distribute

	a combined work that includes FreeRTOS.org, without being obliged to provide

	the source code for any proprietary components.  See the licensing section 

	of http://www.FreeRTOS.org for full details of how and when the exception

	can be applied.

	***************************************************************************

	See http://www.FreeRTOS.org for documentation, latest information, license 

	and contact details.  Please ensure to read the configuration and relevant 

	port sections of the online documentation.

	Also see http://www.SafeRTOS.com for an IEC 61508 compliant version along

	with commercial development and support options.

	***************************************************************************

*/

/* 

Changes between V2.5.1 and V2.5.1

	+ The memory pool has been defined within a struct to ensure correct memory

	  alignment on 32bit systems.

Changes between V2.6.1 and V3.0.0

	+ An overflow check has been added to ensure the next free byte variable 

	  does not wrap around.

*/

/*

 * The simplest possible implementation of pvPortMalloc().  Note that this

 * implementation does NOT allow allocated memory to be freed again.

 *

 * See heap_2.c and heap_3.c for alternative implementations, and the memory

 * management pages of http://www.FreeRTOS.org for more information.

 */

#include <stdlib.h>

#include "FreeRTOS.h"

#include "task.h"

/* Setup the correct byte alignment mask for the defined byte alignment. */

#if portBYTE_ALIGNMENT == 8

#define heapBYTE_ALIGNMENT_MASK ( ( size_t ) 0x0007 )

#endif

#if portBYTE_ALIGNMENT == 4

#define heapBYTE_ALIGNMENT_MASK	( ( size_t ) 0x0003 )

#endif

#if portBYTE_ALIGNMENT == 2

#define heapBYTE_ALIGNMENT_MASK	( ( size_t ) 0x0001 )

#endif

#if portBYTE_ALIGNMENT == 1

#define heapBYTE_ALIGNMENT_MASK	( ( size_t ) 0x0000 )

#endif

#ifndef heapBYTE_ALIGNMENT_MASK

#error "Invalid portBYTE_ALIGNMENT definition"

#endif

/* Allocate the memory for the heap.  The struct is used to force byte

alignment without using any non-portable code. */

static struct xRTOS_HEAP

{

  unsigned portLONG ulDummy;

  unsigned portCHAR ucHeap[configTOTAL_HEAP_SIZE];

} xHeap;

static size_t xNextFreeByte = (size_t) 0;

/*-----------------------------------------------------------*/

void *

pvPortMalloc (size_t xWantedSize)

{

  void *pvReturn = NULL;

  /* Ensure that blocks are always aligned to the required number of bytes. */

#if portBYTE_ALIGNMENT != 1

  if (xWantedSize & heapBYTE_ALIGNMENT_MASK)

    {

      /* Byte alignment required. */

      xWantedSize +=

	(portBYTE_ALIGNMENT - (xWantedSize & heapBYTE_ALIGNMENT_MASK));

    }

#endif

  vTaskSuspendAll ();

  {

    /* Check there is enough room left for the allocation. */

    if (((xNextFreeByte + xWantedSize) < configTOTAL_HEAP_SIZE) && ((xNextFreeByte + xWantedSize) > xNextFreeByte))	/* Check for overflow. */

      {

	/* Return the next free byte then increment the index past this

	   block. */

	pvReturn = &(xHeap.ucHeap[xNextFreeByte]);

	xNextFreeByte += xWantedSize;

      }

  }

  xTaskResumeAll ();

  return pvReturn;

}

/*-----------------------------------------------------------*/

void

vPortFree (void *pv)

{

  /* Memory cannot be freed using this scheme.  See heap_2.c and heap_3.c 

     for alternative implementations, and the memory management pages of 

     http://www.FreeRTOS.org for more information. */

  (void) pv;

}

/*-----------------------------------------------------------*/

void

vPortInitialiseBlocks (void)

{

  /* Only required when static memory is not cleared. */

  xNextFreeByte = (size_t) 0;

}