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69 lines
2.4 KiB
C
69 lines
2.4 KiB
C
/*
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* syscalls.c - MCU dependent syscall implementation for LPCXXXX
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* Copyright (C) 2013 Oliver Hahm <oliver.hahm@inria.fr>
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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#include <errno.h>
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#include <stdint.h>
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#include <sys/unistd.h>
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#include <stdio.h>
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#include "irq.h"
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/**
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* @name Heaps (defined in linker script)
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* @{
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*/
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#define NUM_HEAPS 3
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extern uintptr_t __heap1_start; ///< start of heap memory space
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extern uintptr_t __heap1_max; ///< maximum for end of heap memory space
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extern uintptr_t __heap2_start; ///< start of heap memory space
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extern uintptr_t __heap2_max; ///< maximum for end of heap memory space
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extern uintptr_t __heap3_start; ///< start of heap memory space
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extern uintptr_t __heap3_max; ///< maximum for end of heap memory space
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/// current position in heap
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static caddr_t heap[NUM_HEAPS] = {(caddr_t)&__heap1_start,(caddr_t)&__heap3_start,(caddr_t)&__heap2_start}; // add heap3 before heap2 cause Heap3 address is lower then addr of heap2
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/// maximum position in heap
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static const caddr_t heap_max[NUM_HEAPS] = {(caddr_t)&__heap1_max,(caddr_t)&__heap3_max,(caddr_t)&__heap2_max};
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// start position in heap
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static const caddr_t heap_start[NUM_HEAPS] = {(caddr_t)&__heap1_start,(caddr_t)&__heap3_start,(caddr_t)&__heap2_start};
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/** @} */
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/*-----------------------------------------------------------------------------------*/
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void heap_stats(void)
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{
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for(int i = 0; i < NUM_HEAPS; i++)
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printf("# heap %i: %p -- %p -> %p (%li of %li free)\n", i, heap_start[i], heap[i], heap_max[i],
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(uint32_t)heap_max[i] - (uint32_t)heap[i], (uint32_t)heap_max[i] - (uint32_t)heap_start[i]);
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}
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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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for (volatile uint8_t iUsedHeap = 0; iUsedHeap < NUM_HEAPS; iUsedHeap++ ) {
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caddr_t new_heap = heap[iUsedHeap] + incr;
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if( new_heap <= heap_max[iUsedHeap] ) {
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caddr_t prev_heap = heap[iUsedHeap];
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heap[iUsedHeap] = 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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}
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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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