From 633c646ab36368caf6eaeedd326d9f1835196afd Mon Sep 17 00:00:00 2001 From: henryk Date: Tue, 6 Nov 2007 20:26:48 +0000 Subject: Initial import of FreeRTOS code for OpenPICC git-svn-id: https://svn.openpcd.org:2342/trunk@311 6dc7ffe9-61d6-0310-9af1-9938baff3ed1 --- openpicc/os/core/MemMang/heap_1.c | 143 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 143 insertions(+) create mode 100644 openpicc/os/core/MemMang/heap_1.c (limited to 'openpicc/os/core/MemMang/heap_1.c') diff --git a/openpicc/os/core/MemMang/heap_1.c b/openpicc/os/core/MemMang/heap_1.c new file mode 100644 index 0000000..8370479 --- /dev/null +++ b/openpicc/os/core/MemMang/heap_1.c @@ -0,0 +1,143 @@ +/* + 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 +#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; +} -- cgit v1.2.3