a752c7ab
 elopes
add first test an...
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/*
* Copyright (c) 2005, Swedish Institute of Computer Science
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* Modified by Kaspar Schleiser
*/
/**
* @ingroup cpu
* @{
*
* @file
* @brief MSP430 CPU initialization
*
* @author Kaspar Schleiser <kaspar@schleiser.de>
* @author Oliver Hahm <oliver.hahm@inria.fr>
*
* @}
*/
#include "cpu.h"
#include "irq.h"
#include "periph/init.h"
/*---------------------------------------------------------------------------*/
static void
init_ports(void)
{
/* Turn everything off, device drivers enable what is needed. */
/* All configured for digital I/O */
#ifdef P1SEL
P1SEL = 0;
#endif
#ifdef P2SEL
P2SEL = 0;
#endif
#ifdef P3SEL
P3SEL = 0;
#endif
#ifdef P4SEL
P4SEL = 0;
#endif
#ifdef P5SEL
P5SEL = 0;
#endif
#ifdef P6SEL
P6SEL = 0;
#endif
/* All available inputs */
#ifdef P1DIR
P1DIR = 0;
P1OUT = 0;
#endif
#ifdef P2DIR
P2DIR = 0;
P2OUT = 0;
#endif
#ifdef P3DIR
P3DIR = 0;
P3OUT = 0;
#endif
#ifdef P4DIR
P4DIR = 0;
P4OUT = 0;
#endif
#ifdef P5DIR
P5DIR = 0;
P5OUT = 0;
#endif
#ifdef P6DIR
P6DIR = 0;
P6OUT = 0;
#endif
P1IE = 0;
P2IE = 0;
}
/*---------------------------------------------------------------------------*/
/* msp430-ld may align _end incorrectly. Workaround in cpu_init. */
extern int _end; /* Not in sys/unistd.h */
static char *cur_break = (char *) &_end;
void msp430_cpu_init(void)
{
irq_disable();
init_ports();
irq_enable();
periph_init();
if ((uintptr_t)cur_break & 1) { /* Workaround for msp430-ld bug!*/
cur_break++;
}
}
/*---------------------------------------------------------------------------*/
#define asmv(arg) __asm__ __volatile__(arg)
#define STACK_EXTRA 32
/*
* Allocate memory from the heap. Check that we don't collide with the
* stack right now (some other routine might later). A watchdog might
* be used to check if cur_break and the stack pointer meet during
* runtime.
*/
void *sbrk(int incr)
{
char *stack_pointer;
asmv("mov r1, %0" : "=r"(stack_pointer));
stack_pointer -= STACK_EXTRA;
if (incr > (stack_pointer - cur_break)) {
return (void *) - 1; /* ENOMEM */
}
void *old_break = cur_break;
cur_break += incr;
/*
* If the stack was never here then [old_break .. cur_break] should
* be filled with zeros.
*/
return old_break;
}
/*---------------------------------------------------------------------------*/
/*
* Mask all interrupts that can be masked.
*/
int
splhigh_(void)
{
/* Clear the GIE (General Interrupt Enable) flag. */
int sr;
asmv("mov r2, %0" : "=r"(sr));
asmv("bic %0, r2" : : "i"(GIE));
asmv("nop");
return sr & GIE; /* Ignore other sr bits. */
}
/*---------------------------------------------------------------------------*/
/*
* Restore previous interrupt mask.
*/
void
splx_(int sr)
{
sr &= GIE;
/* If GIE was set, restore it. */
asmv("bis %0, r2" : : "r"(sr));
asmv("nop");
}
/*---------------------------------------------------------------------------*/
size_t strnlen(const char *s, size_t maxlen)
{
size_t len;
for (len = 0; len < maxlen; len++, s++) {
if (!*s)
break;
}
return (len);
}
extern void board_init(void);
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