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https://github.com/IcedRooibos/py32f0-template.git
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595 lines
22 KiB
C
595 lines
22 KiB
C
/*
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* FreeRTOS Kernel V10.5.1
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* Copyright (C) 2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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*
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* SPDX-License-Identifier: MIT
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of
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* this software and associated documentation files (the "Software"), to deal in
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* the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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* the Software, and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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* https://www.FreeRTOS.org
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* https://github.com/FreeRTOS
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*
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*/
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/*
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* A sample implementation of pvPortMalloc() that allows the heap to be defined
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* across multiple non-contigous blocks and combines (coalescences) adjacent
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* memory blocks as they are freed.
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*
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* See heap_1.c, heap_2.c, heap_3.c and heap_4.c for alternative
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* implementations, and the memory management pages of https://www.FreeRTOS.org
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* for more information.
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*
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* Usage notes:
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*
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* vPortDefineHeapRegions() ***must*** be called before pvPortMalloc().
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* pvPortMalloc() will be called if any task objects (tasks, queues, event
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* groups, etc.) are created, therefore vPortDefineHeapRegions() ***must*** be
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* called before any other objects are defined.
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*
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* vPortDefineHeapRegions() takes a single parameter. The parameter is an array
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* of HeapRegion_t structures. HeapRegion_t is defined in portable.h as
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*
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* typedef struct HeapRegion
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* {
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* uint8_t *pucStartAddress; << Start address of a block of memory that will be part of the heap.
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* size_t xSizeInBytes; << Size of the block of memory.
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* } HeapRegion_t;
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*
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* The array is terminated using a NULL zero sized region definition, and the
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* memory regions defined in the array ***must*** appear in address order from
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* low address to high address. So the following is a valid example of how
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* to use the function.
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*
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* HeapRegion_t xHeapRegions[] =
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* {
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* { ( uint8_t * ) 0x80000000UL, 0x10000 }, << Defines a block of 0x10000 bytes starting at address 0x80000000
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* { ( uint8_t * ) 0x90000000UL, 0xa0000 }, << Defines a block of 0xa0000 bytes starting at address of 0x90000000
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* { NULL, 0 } << Terminates the array.
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* };
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*
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* vPortDefineHeapRegions( xHeapRegions ); << Pass the array into vPortDefineHeapRegions().
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*
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* Note 0x80000000 is the lower address so appears in the array first.
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*
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*/
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#include <stdlib.h>
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#include <string.h>
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/* Defining MPU_WRAPPERS_INCLUDED_FROM_API_FILE prevents task.h from redefining
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* all the API functions to use the MPU wrappers. That should only be done when
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* task.h is included from an application file. */
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#define MPU_WRAPPERS_INCLUDED_FROM_API_FILE
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#include "FreeRTOS.h"
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#include "task.h"
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#undef MPU_WRAPPERS_INCLUDED_FROM_API_FILE
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#if ( configSUPPORT_DYNAMIC_ALLOCATION == 0 )
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#error This file must not be used if configSUPPORT_DYNAMIC_ALLOCATION is 0
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#endif
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#ifndef configHEAP_CLEAR_MEMORY_ON_FREE
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#define configHEAP_CLEAR_MEMORY_ON_FREE 0
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#endif
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/* Block sizes must not get too small. */
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#define heapMINIMUM_BLOCK_SIZE ( ( size_t ) ( xHeapStructSize << 1 ) )
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/* Assumes 8bit bytes! */
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#define heapBITS_PER_BYTE ( ( size_t ) 8 )
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/* Max value that fits in a size_t type. */
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#define heapSIZE_MAX ( ~( ( size_t ) 0 ) )
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/* Check if multiplying a and b will result in overflow. */
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#define heapMULTIPLY_WILL_OVERFLOW( a, b ) ( ( ( a ) > 0 ) && ( ( b ) > ( heapSIZE_MAX / ( a ) ) ) )
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/* Check if adding a and b will result in overflow. */
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#define heapADD_WILL_OVERFLOW( a, b ) ( ( a ) > ( heapSIZE_MAX - ( b ) ) )
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/* MSB of the xBlockSize member of an BlockLink_t structure is used to track
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* the allocation status of a block. When MSB of the xBlockSize member of
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* an BlockLink_t structure is set then the block belongs to the application.
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* When the bit is free the block is still part of the free heap space. */
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#define heapBLOCK_ALLOCATED_BITMASK ( ( ( size_t ) 1 ) << ( ( sizeof( size_t ) * heapBITS_PER_BYTE ) - 1 ) )
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#define heapBLOCK_SIZE_IS_VALID( xBlockSize ) ( ( ( xBlockSize ) & heapBLOCK_ALLOCATED_BITMASK ) == 0 )
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#define heapBLOCK_IS_ALLOCATED( pxBlock ) ( ( ( pxBlock->xBlockSize ) & heapBLOCK_ALLOCATED_BITMASK ) != 0 )
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#define heapALLOCATE_BLOCK( pxBlock ) ( ( pxBlock->xBlockSize ) |= heapBLOCK_ALLOCATED_BITMASK )
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#define heapFREE_BLOCK( pxBlock ) ( ( pxBlock->xBlockSize ) &= ~heapBLOCK_ALLOCATED_BITMASK )
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/*-----------------------------------------------------------*/
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/* Define the linked list structure. This is used to link free blocks in order
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* of their memory address. */
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typedef struct A_BLOCK_LINK
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{
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struct A_BLOCK_LINK * pxNextFreeBlock; /*<< The next free block in the list. */
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size_t xBlockSize; /*<< The size of the free block. */
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} BlockLink_t;
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/*-----------------------------------------------------------*/
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/*
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* Inserts a block of memory that is being freed into the correct position in
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* the list of free memory blocks. The block being freed will be merged with
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* the block in front it and/or the block behind it if the memory blocks are
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* adjacent to each other.
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*/
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static void prvInsertBlockIntoFreeList( BlockLink_t * pxBlockToInsert );
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/*-----------------------------------------------------------*/
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/* The size of the structure placed at the beginning of each allocated memory
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* block must by correctly byte aligned. */
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static const size_t xHeapStructSize = ( sizeof( BlockLink_t ) + ( ( size_t ) ( portBYTE_ALIGNMENT - 1 ) ) ) & ~( ( size_t ) portBYTE_ALIGNMENT_MASK );
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/* Create a couple of list links to mark the start and end of the list. */
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static BlockLink_t xStart;
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static BlockLink_t * pxEnd = NULL;
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/* Keeps track of the number of calls to allocate and free memory as well as the
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* number of free bytes remaining, but says nothing about fragmentation. */
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static size_t xFreeBytesRemaining = 0U;
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static size_t xMinimumEverFreeBytesRemaining = 0U;
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static size_t xNumberOfSuccessfulAllocations = 0;
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static size_t xNumberOfSuccessfulFrees = 0;
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/*-----------------------------------------------------------*/
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void * pvPortMalloc( size_t xWantedSize )
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{
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BlockLink_t * pxBlock;
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BlockLink_t * pxPreviousBlock;
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BlockLink_t * pxNewBlockLink;
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void * pvReturn = NULL;
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size_t xAdditionalRequiredSize;
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/* The heap must be initialised before the first call to
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* prvPortMalloc(). */
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configASSERT( pxEnd );
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vTaskSuspendAll();
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{
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if( xWantedSize > 0 )
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{
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/* The wanted size must be increased so it can contain a BlockLink_t
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* structure in addition to the requested amount of bytes. Some
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* additional increment may also be needed for alignment. */
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xAdditionalRequiredSize = xHeapStructSize + portBYTE_ALIGNMENT - ( xWantedSize & portBYTE_ALIGNMENT_MASK );
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if( heapADD_WILL_OVERFLOW( xWantedSize, xAdditionalRequiredSize ) == 0 )
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{
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xWantedSize += xAdditionalRequiredSize;
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}
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else
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{
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xWantedSize = 0;
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}
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}
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else
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{
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mtCOVERAGE_TEST_MARKER();
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}
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/* Check the block size we are trying to allocate is not so large that the
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* top bit is set. The top bit of the block size member of the BlockLink_t
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* structure is used to determine who owns the block - the application or
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* the kernel, so it must be free. */
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if( heapBLOCK_SIZE_IS_VALID( xWantedSize ) != 0 )
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{
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if( ( xWantedSize > 0 ) && ( xWantedSize <= xFreeBytesRemaining ) )
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{
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/* Traverse the list from the start (lowest address) block until
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* one of adequate size is found. */
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pxPreviousBlock = &xStart;
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pxBlock = xStart.pxNextFreeBlock;
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while( ( pxBlock->xBlockSize < xWantedSize ) && ( pxBlock->pxNextFreeBlock != NULL ) )
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{
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pxPreviousBlock = pxBlock;
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pxBlock = pxBlock->pxNextFreeBlock;
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}
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/* If the end marker was reached then a block of adequate size
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* was not found. */
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if( pxBlock != pxEnd )
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{
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/* Return the memory space pointed to - jumping over the
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* BlockLink_t structure at its start. */
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pvReturn = ( void * ) ( ( ( uint8_t * ) pxPreviousBlock->pxNextFreeBlock ) + xHeapStructSize );
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/* This block is being returned for use so must be taken out
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* of the list of free blocks. */
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pxPreviousBlock->pxNextFreeBlock = pxBlock->pxNextFreeBlock;
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/* If the block is larger than required it can be split into
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* two. */
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if( ( pxBlock->xBlockSize - xWantedSize ) > heapMINIMUM_BLOCK_SIZE )
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{
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/* This block is to be split into two. Create a new
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* block following the number of bytes requested. The void
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* cast is used to prevent byte alignment warnings from the
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* compiler. */
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pxNewBlockLink = ( void * ) ( ( ( uint8_t * ) pxBlock ) + xWantedSize );
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/* Calculate the sizes of two blocks split from the
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* single block. */
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pxNewBlockLink->xBlockSize = pxBlock->xBlockSize - xWantedSize;
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pxBlock->xBlockSize = xWantedSize;
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/* Insert the new block into the list of free blocks. */
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prvInsertBlockIntoFreeList( ( pxNewBlockLink ) );
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}
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else
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{
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mtCOVERAGE_TEST_MARKER();
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}
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xFreeBytesRemaining -= pxBlock->xBlockSize;
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if( xFreeBytesRemaining < xMinimumEverFreeBytesRemaining )
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{
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xMinimumEverFreeBytesRemaining = xFreeBytesRemaining;
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}
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else
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{
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mtCOVERAGE_TEST_MARKER();
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}
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/* The block is being returned - it is allocated and owned
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* by the application and has no "next" block. */
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heapALLOCATE_BLOCK( pxBlock );
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pxBlock->pxNextFreeBlock = NULL;
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xNumberOfSuccessfulAllocations++;
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}
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else
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{
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mtCOVERAGE_TEST_MARKER();
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}
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}
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else
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{
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mtCOVERAGE_TEST_MARKER();
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}
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}
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else
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{
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mtCOVERAGE_TEST_MARKER();
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}
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traceMALLOC( pvReturn, xWantedSize );
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}
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( void ) xTaskResumeAll();
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#if ( configUSE_MALLOC_FAILED_HOOK == 1 )
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{
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if( pvReturn == NULL )
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{
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vApplicationMallocFailedHook();
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}
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else
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{
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mtCOVERAGE_TEST_MARKER();
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}
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}
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#endif /* if ( configUSE_MALLOC_FAILED_HOOK == 1 ) */
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return pvReturn;
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}
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/*-----------------------------------------------------------*/
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void vPortFree( void * pv )
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{
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uint8_t * puc = ( uint8_t * ) pv;
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BlockLink_t * pxLink;
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if( pv != NULL )
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{
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/* The memory being freed will have an BlockLink_t structure immediately
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* before it. */
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puc -= xHeapStructSize;
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/* This casting is to keep the compiler from issuing warnings. */
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pxLink = ( void * ) puc;
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configASSERT( heapBLOCK_IS_ALLOCATED( pxLink ) != 0 );
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configASSERT( pxLink->pxNextFreeBlock == NULL );
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if( heapBLOCK_IS_ALLOCATED( pxLink ) != 0 )
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{
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if( pxLink->pxNextFreeBlock == NULL )
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{
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/* The block is being returned to the heap - it is no longer
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* allocated. */
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heapFREE_BLOCK( pxLink );
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#if ( configHEAP_CLEAR_MEMORY_ON_FREE == 1 )
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{
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( void ) memset( puc + xHeapStructSize, 0, pxLink->xBlockSize - xHeapStructSize );
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}
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#endif
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vTaskSuspendAll();
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{
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/* Add this block to the list of free blocks. */
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xFreeBytesRemaining += pxLink->xBlockSize;
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traceFREE( pv, pxLink->xBlockSize );
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prvInsertBlockIntoFreeList( ( ( BlockLink_t * ) pxLink ) );
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xNumberOfSuccessfulFrees++;
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}
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( void ) xTaskResumeAll();
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}
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else
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{
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mtCOVERAGE_TEST_MARKER();
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}
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}
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else
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{
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mtCOVERAGE_TEST_MARKER();
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}
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}
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}
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/*-----------------------------------------------------------*/
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size_t xPortGetFreeHeapSize( void )
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{
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return xFreeBytesRemaining;
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}
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/*-----------------------------------------------------------*/
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size_t xPortGetMinimumEverFreeHeapSize( void )
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{
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return xMinimumEverFreeBytesRemaining;
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}
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/*-----------------------------------------------------------*/
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void * pvPortCalloc( size_t xNum,
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size_t xSize )
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{
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void * pv = NULL;
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if( heapMULTIPLY_WILL_OVERFLOW( xNum, xSize ) == 0 )
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{
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pv = pvPortMalloc( xNum * xSize );
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if( pv != NULL )
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{
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( void ) memset( pv, 0, xNum * xSize );
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}
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}
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return pv;
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}
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/*-----------------------------------------------------------*/
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static void prvInsertBlockIntoFreeList( BlockLink_t * pxBlockToInsert )
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{
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BlockLink_t * pxIterator;
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uint8_t * puc;
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/* Iterate through the list until a block is found that has a higher address
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* than the block being inserted. */
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for( pxIterator = &xStart; pxIterator->pxNextFreeBlock < pxBlockToInsert; pxIterator = pxIterator->pxNextFreeBlock )
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{
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/* Nothing to do here, just iterate to the right position. */
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}
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/* Do the block being inserted, and the block it is being inserted after
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* make a contiguous block of memory? */
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puc = ( uint8_t * ) pxIterator;
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if( ( puc + pxIterator->xBlockSize ) == ( uint8_t * ) pxBlockToInsert )
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{
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pxIterator->xBlockSize += pxBlockToInsert->xBlockSize;
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pxBlockToInsert = pxIterator;
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}
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else
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{
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mtCOVERAGE_TEST_MARKER();
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}
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/* Do the block being inserted, and the block it is being inserted before
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* make a contiguous block of memory? */
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puc = ( uint8_t * ) pxBlockToInsert;
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if( ( puc + pxBlockToInsert->xBlockSize ) == ( uint8_t * ) pxIterator->pxNextFreeBlock )
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{
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if( pxIterator->pxNextFreeBlock != pxEnd )
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{
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/* Form one big block from the two blocks. */
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pxBlockToInsert->xBlockSize += pxIterator->pxNextFreeBlock->xBlockSize;
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pxBlockToInsert->pxNextFreeBlock = pxIterator->pxNextFreeBlock->pxNextFreeBlock;
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}
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else
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{
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pxBlockToInsert->pxNextFreeBlock = pxEnd;
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}
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}
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else
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{
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pxBlockToInsert->pxNextFreeBlock = pxIterator->pxNextFreeBlock;
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}
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/* If the block being inserted plugged a gab, so was merged with the block
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* before and the block after, then it's pxNextFreeBlock pointer will have
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* already been set, and should not be set here as that would make it point
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* to itself. */
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if( pxIterator != pxBlockToInsert )
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{
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pxIterator->pxNextFreeBlock = pxBlockToInsert;
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}
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else
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{
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mtCOVERAGE_TEST_MARKER();
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}
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}
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/*-----------------------------------------------------------*/
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void vPortDefineHeapRegions( const HeapRegion_t * const pxHeapRegions )
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{
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BlockLink_t * pxFirstFreeBlockInRegion = NULL;
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BlockLink_t * pxPreviousFreeBlock;
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portPOINTER_SIZE_TYPE xAlignedHeap;
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size_t xTotalRegionSize, xTotalHeapSize = 0;
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BaseType_t xDefinedRegions = 0;
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portPOINTER_SIZE_TYPE xAddress;
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const HeapRegion_t * pxHeapRegion;
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/* Can only call once! */
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configASSERT( pxEnd == NULL );
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pxHeapRegion = &( pxHeapRegions[ xDefinedRegions ] );
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while( pxHeapRegion->xSizeInBytes > 0 )
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{
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xTotalRegionSize = pxHeapRegion->xSizeInBytes;
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/* Ensure the heap region starts on a correctly aligned boundary. */
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xAddress = ( portPOINTER_SIZE_TYPE ) pxHeapRegion->pucStartAddress;
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if( ( xAddress & portBYTE_ALIGNMENT_MASK ) != 0 )
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{
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xAddress += ( portBYTE_ALIGNMENT - 1 );
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xAddress &= ~portBYTE_ALIGNMENT_MASK;
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/* Adjust the size for the bytes lost to alignment. */
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xTotalRegionSize -= ( size_t ) ( xAddress - ( portPOINTER_SIZE_TYPE ) pxHeapRegion->pucStartAddress );
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}
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xAlignedHeap = xAddress;
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/* Set xStart if it has not already been set. */
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if( xDefinedRegions == 0 )
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{
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/* xStart is used to hold a pointer to the first item in the list of
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* free blocks. The void cast is used to prevent compiler warnings. */
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xStart.pxNextFreeBlock = ( BlockLink_t * ) xAlignedHeap;
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xStart.xBlockSize = ( size_t ) 0;
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}
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else
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{
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/* Should only get here if one region has already been added to the
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* heap. */
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configASSERT( pxEnd != NULL );
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/* Check blocks are passed in with increasing start addresses. */
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configASSERT( xAddress > ( size_t ) pxEnd );
|
|
}
|
|
|
|
/* Remember the location of the end marker in the previous region, if
|
|
* any. */
|
|
pxPreviousFreeBlock = pxEnd;
|
|
|
|
/* pxEnd is used to mark the end of the list of free blocks and is
|
|
* inserted at the end of the region space. */
|
|
xAddress = xAlignedHeap + xTotalRegionSize;
|
|
xAddress -= xHeapStructSize;
|
|
xAddress &= ~( ( size_t ) portBYTE_ALIGNMENT_MASK );
|
|
pxEnd = ( BlockLink_t * ) xAddress;
|
|
pxEnd->xBlockSize = 0;
|
|
pxEnd->pxNextFreeBlock = NULL;
|
|
|
|
/* To start with there is a single free block in this region that is
|
|
* sized to take up the entire heap region minus the space taken by the
|
|
* free block structure. */
|
|
pxFirstFreeBlockInRegion = ( BlockLink_t * ) xAlignedHeap;
|
|
pxFirstFreeBlockInRegion->xBlockSize = ( size_t ) ( xAddress - ( portPOINTER_SIZE_TYPE ) pxFirstFreeBlockInRegion );
|
|
pxFirstFreeBlockInRegion->pxNextFreeBlock = pxEnd;
|
|
|
|
/* If this is not the first region that makes up the entire heap space
|
|
* then link the previous region to this region. */
|
|
if( pxPreviousFreeBlock != NULL )
|
|
{
|
|
pxPreviousFreeBlock->pxNextFreeBlock = pxFirstFreeBlockInRegion;
|
|
}
|
|
|
|
xTotalHeapSize += pxFirstFreeBlockInRegion->xBlockSize;
|
|
|
|
/* Move onto the next HeapRegion_t structure. */
|
|
xDefinedRegions++;
|
|
pxHeapRegion = &( pxHeapRegions[ xDefinedRegions ] );
|
|
}
|
|
|
|
xMinimumEverFreeBytesRemaining = xTotalHeapSize;
|
|
xFreeBytesRemaining = xTotalHeapSize;
|
|
|
|
/* Check something was actually defined before it is accessed. */
|
|
configASSERT( xTotalHeapSize );
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
void vPortGetHeapStats( HeapStats_t * pxHeapStats )
|
|
{
|
|
BlockLink_t * pxBlock;
|
|
size_t xBlocks = 0, xMaxSize = 0, xMinSize = portMAX_DELAY; /* portMAX_DELAY used as a portable way of getting the maximum value. */
|
|
|
|
vTaskSuspendAll();
|
|
{
|
|
pxBlock = xStart.pxNextFreeBlock;
|
|
|
|
/* pxBlock will be NULL if the heap has not been initialised. The heap
|
|
* is initialised automatically when the first allocation is made. */
|
|
if( pxBlock != NULL )
|
|
{
|
|
while( pxBlock != pxEnd )
|
|
{
|
|
/* Increment the number of blocks and record the largest block seen
|
|
* so far. */
|
|
xBlocks++;
|
|
|
|
if( pxBlock->xBlockSize > xMaxSize )
|
|
{
|
|
xMaxSize = pxBlock->xBlockSize;
|
|
}
|
|
|
|
/* Heap five will have a zero sized block at the end of each
|
|
* each region - the block is only used to link to the next
|
|
* heap region so it not a real block. */
|
|
if( pxBlock->xBlockSize != 0 )
|
|
{
|
|
if( pxBlock->xBlockSize < xMinSize )
|
|
{
|
|
xMinSize = pxBlock->xBlockSize;
|
|
}
|
|
}
|
|
|
|
/* Move to the next block in the chain until the last block is
|
|
* reached. */
|
|
pxBlock = pxBlock->pxNextFreeBlock;
|
|
}
|
|
}
|
|
}
|
|
( void ) xTaskResumeAll();
|
|
|
|
pxHeapStats->xSizeOfLargestFreeBlockInBytes = xMaxSize;
|
|
pxHeapStats->xSizeOfSmallestFreeBlockInBytes = xMinSize;
|
|
pxHeapStats->xNumberOfFreeBlocks = xBlocks;
|
|
|
|
taskENTER_CRITICAL();
|
|
{
|
|
pxHeapStats->xAvailableHeapSpaceInBytes = xFreeBytesRemaining;
|
|
pxHeapStats->xNumberOfSuccessfulAllocations = xNumberOfSuccessfulAllocations;
|
|
pxHeapStats->xNumberOfSuccessfulFrees = xNumberOfSuccessfulFrees;
|
|
pxHeapStats->xMinimumEverFreeBytesRemaining = xMinimumEverFreeBytesRemaining;
|
|
}
|
|
taskEXIT_CRITICAL();
|
|
}
|
|
/*-----------------------------------------------------------*/
|