2 * FreeRTOS Kernel V10.0.1
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3 * Copyright (C) 2017 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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5 * Permission is hereby granted, free of charge, to any person obtaining a copy of
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6 * this software and associated documentation files (the "Software"), to deal in
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7 * the Software without restriction, including without limitation the rights to
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8 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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9 * the Software, and to permit persons to whom the Software is furnished to do so,
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10 * subject to the following conditions:
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12 * The above copyright notice and this permission notice shall be included in all
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13 * copies or substantial portions of the Software.
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15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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17 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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18 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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19 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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20 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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22 * http://www.FreeRTOS.org
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23 * http://aws.amazon.com/freertos
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25 * 1 tab == 4 spaces!
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31 * The simplest possible implementation of pvPortMalloc(). Note that this
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32 * implementation does NOT allow allocated memory to be freed again.
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34 * See heap_2.c and heap_3.c for alternative implementations, and the memory
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35 * management pages of http://www.FreeRTOS.org for more information.
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38 #include "FreeRTOS.h"
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42 /* Allocate the memory for the heap. The struct is used to force byte
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43 alignment without using any non-portable code. */
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44 extern struct xRTOS_HEAP
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46 unsigned long ulDummy;
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47 unsigned char ucHeap[ configTOTAL_HEAP_SIZE ];
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50 static size_t xNextFreeByte = ( size_t ) 0;
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51 /*-----------------------------------------------------------*/
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53 void *pvPortMalloc( size_t xWantedSize )
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55 void *pvReturn = NULL;
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57 /* Ensure that blocks are always aligned to the required number of bytes. */
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58 #if portBYTE_ALIGNMENT != 1
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59 if( xWantedSize & portBYTE_ALIGNMENT_MASK )
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61 /* Byte alignment required. */
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62 xWantedSize += ( portBYTE_ALIGNMENT - ( xWantedSize & portBYTE_ALIGNMENT_MASK ) );
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68 /* Check there is enough room left for the allocation. */
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69 if( ( ( xNextFreeByte + xWantedSize ) < configTOTAL_HEAP_SIZE ) &&
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70 ( ( xNextFreeByte + xWantedSize ) > xNextFreeByte ) )/* Check for overflow. */
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72 /* Return the next free byte then increment the index past this
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74 pvReturn = &( xHeap.ucHeap[ xNextFreeByte ] );
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75 xNextFreeByte += xWantedSize;
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82 /*-----------------------------------------------------------*/
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84 void vPortFree( void *pv )
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86 /* Memory cannot be freed using this scheme. See heap_2.c and heap_3.c
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87 for alternative implementations, and the memory management pages of
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88 http://www.FreeRTOS.org for more information. */
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91 /*-----------------------------------------------------------*/
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93 void vPortInitialiseBlocks( void )
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95 /* Only required when static memory is not cleared. */
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96 xNextFreeByte = ( size_t ) 0;
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