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* mc1322x specifics syscalls

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Oliver Hahm 2013-04-02 02:07:41 +02:00
parent 24300304f3
commit 0add4cad21
2 changed files with 75 additions and 0 deletions
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19
cpu/mc1322x/cpu.c Normal file
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/*
* cpu.c - MC1322X architecture common support functions
* Copyright (C) 2013 Oliver Hahm <oliver.hahm@inria.fr>
*
* This source code is licensed under the GNU General Public License,
* Version 3. See the file LICENSE for more details.
*
* This file is part of RIOT.
*
*/
#include "mc1322x.h"
__attribute__((naked,noreturn)) void arm_reset(void)
{
dINT();
CRM->SW_RST = SW_RST_VAL;
while(1);
}

56
cpu/mc1322x/mc1322x_syscalls.c Normal file
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/*
* mc1322x_syscalls.c - MCU dependent syscall implementation
* Copyright (C) 2013 Oliver Hahm <oliver.hahm@inria.fr>
*
* This source code is licensed under the GNU General Public License,
* Version 3. See the file LICENSE for more details.
*
* This file is part of RIOT.
*/
#include <errno.h>
#include <stdint.h>
#include <stdlib.h>
#include <sys/types.h>
#include "irq.h"
extern uintptr_t __heap_start; ///< start of heap memory space
extern uintptr_t __heap_end; ///< maximum for end of heap memory space
/// current position in heap
static caddr_t heap = (caddr_t)&__heap_start;
/// maximum position in heap
static const caddr_t heap_max = (caddr_t)&__heap_end;
// start position in heap
static const caddr_t heap_start = (caddr_t)&__heap_start;
/*-----------------------------------------------------------------------------------*/
caddr_t _sbrk_r(struct _reent *r, size_t incr)
{
uint32_t cpsr = disableIRQ();
/* check all heaps for a chunk of the requested size */
caddr_t new_heap = heap + incr;
#ifdef MODULE_TRACELOG
trace_pointer(TRACELOG_EV_MEMORY, heap);
#endif
if( new_heap <= heap_max ) {
caddr_t prev_heap = heap;
#ifdef MODULE_TRACELOG
trace_pointer(TRACELOG_EV_MEMORY, new_heap);
#endif
heap = new_heap;
r->_errno = 0;
restoreIRQ(cpsr);
return prev_heap;
}
restoreIRQ(cpsr);
#ifdef MODULE_TRACELOG
trace_string(TRACELOG_EV_MEMORY, "heap!"); // heap full
#endif
r->_errno = ENOMEM;
return NULL;
}