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/*
ChibiOS/RT - Copyright (C) 2006-2007 Giovanni Di Sirio.
This file is part of ChibiOS/RT.
ChibiOS/RT 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 3 of the License, or
(at your option) any later version.
ChibiOS/RT 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file chmemcore.c
* @brief Core memory manager code.
* @addtogroup memcore
* @{
*/
#include <ch.h>
#if CH_USE_MEMCORE
#if CH_MEMCORE_SIZE == 0
extern align_t __heap_base__;
extern align_t __heap_end__;
#else
align_t buffer[ALIGN_SIZE(CH_MEMCORE_SIZE) / sizeof(align_t)];
#endif
static align_t *nextmem;
static align_t *endmem;
/**
* @brief Low level memory manager initialization.
*
* @note Internal use only.
*/
void core_init(void) {
#if CH_MEMCORE_SIZE == 0
nextmem = &__heap_base__;
endmem = &__heap_end__;
#else
nextmem = &buffer[0];
endmem = &buffer[ALIGN_SIZE(CH_MEMCORE_SIZE) / sizeof(align_t)];
#endif
}
/**
* @brief Allocates a block of memory.
* @details The size of the returned block is aligned to the alignment
* type @p align_t so it is not possible to allocate less than
* <code>sizeof(align_t)</code>.
*
*
* @param[in] the size of the block to be allocated
* @return A pointer to the allocated memory block.
* @retval NULL allocation failed, core memory exhausted.
*/
void *chCoreAlloc(size_t size) {
void *p;
chSysLock();
p = chCoreAllocI(size);
chSysUnlock();
return p;
}
/**
* @brief Allocates a block of memory.
* @details The size of the returned block is aligned to the alignment
* type @p align_t so it is not possible to allocate less than
* <code>sizeof(align_t)</code>.
*
* @param[in] the size of the block to be allocated.
* @return A pointer to the allocated memory block.
* @retval NULL allocation failed, core memory exhausted.
*/
void *chCoreAllocI(size_t size) {
void *p;
size = MEM_ALIGN_SIZE(size);
if (nextmem + size > endmem)
return NULL;
p = nextmem;
nextmem += size;
return p;
}
#endif /* CH_USE_MEMCORE */
/** @} */
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