164 lines
5.4 KiB
C
164 lines
5.4 KiB
C
/*
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ChibiOS - Copyright (C) 2006..2015 Giovanni Di Sirio.
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This file is part of ChibiOS.
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ChibiOS is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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ChibiOS is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* @file chmemcore.c
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* @brief Core memory manager code.
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*
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* @addtogroup memcore
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* @details Core Memory Manager related APIs and services.
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* <h2>Operation mode</h2>
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* The core memory manager is a simplified allocator that only
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* allows to allocate memory blocks without the possibility to
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* free them.<br>
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* This allocator is meant as a memory blocks provider for the
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* other allocators such as:
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* - C-Runtime allocator (through a compiler specific adapter module).
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* - Heap allocator (see @ref heaps).
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* - Memory pools allocator (see @ref pools).
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* .
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* By having a centralized memory provider the various allocators
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* can coexist and share the main memory.<br>
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* This allocator, alone, is also useful for very simple
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* applications that just require a simple way to get memory
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* blocks.
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* @pre In order to use the core memory manager APIs the @p CH_CFG_USE_MEMCORE
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* option must be enabled in @p chconf.h.
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* @{
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*/
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#include "ch.h"
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#if (CH_CFG_USE_MEMCORE == TRUE) || defined(__DOXYGEN__)
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/*===========================================================================*/
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/* Module exported variables. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Module local types. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Module local variables. */
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/*===========================================================================*/
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static uint8_t *nextmem;
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static uint8_t *endmem;
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/*===========================================================================*/
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/* Module local functions. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Module exported functions. */
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/*===========================================================================*/
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/**
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* @brief Low level memory manager initialization.
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*
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* @notapi
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*/
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void _core_init(void) {
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#if CH_CFG_MEMCORE_SIZE == 0
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extern uint8_t __heap_base__[];
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extern uint8_t __heap_end__[];
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/*lint -save -e9033 [10.8] Required cast operations.*/
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nextmem = (uint8_t *)MEM_ALIGN_NEXT(__heap_base__);
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endmem = (uint8_t *)MEM_ALIGN_PREV(__heap_end__);
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/*lint restore*/
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#else
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static stkalign_t buffer[MEM_ALIGN_NEXT(CH_CFG_MEMCORE_SIZE) /
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MEM_ALIGN_SIZE];
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nextmem = (uint8_t *)&buffer[0];
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endmem = (uint8_t *)&buffer[MEM_ALIGN_NEXT(CH_CFG_MEMCORE_SIZE) /
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MEM_ALIGN_SIZE];
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#endif
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}
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/**
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* @brief Allocates a memory block.
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* @details The size of the returned block is aligned to the alignment
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* type so it is not possible to allocate less
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* than <code>MEM_ALIGN_SIZE</code>.
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*
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* @param[in] size the size of the block to be allocated
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* @return A pointer to the allocated memory block.
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* @retval NULL allocation failed, core memory exhausted.
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*
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* @api
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*/
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void *chCoreAlloc(size_t size) {
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void *p;
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chSysLock();
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p = chCoreAllocI(size);
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chSysUnlock();
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return p;
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}
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/**
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* @brief Allocates a memory block.
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* @details The size of the returned block is aligned to the alignment
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* type so it is not possible to allocate less than
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* <code>MEM_ALIGN_SIZE</code>.
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*
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* @param[in] size the size of the block to be allocated.
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* @return A pointer to the allocated memory block.
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* @retval NULL allocation failed, core memory exhausted.
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*
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* @iclass
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*/
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void *chCoreAllocI(size_t size) {
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void *p;
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chDbgCheckClassI();
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size = MEM_ALIGN_NEXT(size);
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/*lint -save -e9033 [10.8] The cast is safe.*/
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if ((size_t)(endmem - nextmem) < size) {
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/*lint -restore*/
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return NULL;
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}
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p = nextmem;
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nextmem += size;
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return p;
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}
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/**
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* @brief Core memory status.
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*
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* @return The size, in bytes, of the free core memory.
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*
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* @xclass
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*/
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size_t chCoreGetStatusX(void) {
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/*lint -save -e9033 [10.8] The cast is safe.*/
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return (size_t)(endmem - nextmem);
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/*lint -restore*/
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}
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#endif /* CH_CFG_USE_MEMCORE == TRUE */
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/** @} */
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