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48 lines
1.3 KiB
C
48 lines
1.3 KiB
C
/*
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* mc1322x_syscalls.c - MCU dependent syscall implementation
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* Copyright (C) 2013 Oliver Hahm <oliver.hahm@inria.fr>
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*
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* This source code is licensed under the GNU Lesser General Public License,
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* Version 2. See the file LICENSE for more details.
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*
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* This file is part of RIOT.
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*/
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#include <errno.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include "irq.h"
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extern uintptr_t __heap_start; ///< start of heap memory space
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extern uintptr_t __heap_end; ///< maximum for end of heap memory space
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/// current position in heap
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static caddr_t heap = (caddr_t)&__heap_start;
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/// maximum position in heap
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static const caddr_t heap_max = (caddr_t)&__heap_end;
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// start position in heap
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static const caddr_t heap_start = (caddr_t)&__heap_start;
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/*-----------------------------------------------------------------------------------*/
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caddr_t _sbrk_r(struct _reent *r, size_t incr)
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{
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uint32_t cpsr = disableIRQ();
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/* check all heaps for a chunk of the requested size */
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caddr_t new_heap = heap + incr;
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if( new_heap <= heap_max ) {
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caddr_t prev_heap = heap;
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heap = new_heap;
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r->_errno = 0;
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restoreIRQ(cpsr);
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return prev_heap;
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}
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restoreIRQ(cpsr);
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r->_errno = ENOMEM;
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return NULL;
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}
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