2.3-InternetRadio/nutos/nut/arch/avr32/os/nutinit.c

/*!
 * Copyright (C) 2001-2010 by egnite Software GmbH
 *
 * 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 copyright holders nor the names of
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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
 * COPYRIGHT OWNER 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.
 *
 * For additional information see http://www.ethernut.de/
 */


/*
 * $Id$
 */

#include <cfg/clock.h>
#include <cfg/arch.h>
#include <cfg/memory.h>
#include <cfg/os.h>
#include <sys/heap.h>
#include <sys/confos.h>
#include <sys/thread.h>
#include <sys/timer.h>

#include <arch/avr32.h>

#include <arch/avr32/pm.h>
#include <arch/avr32/ihndlr.h>


/*!
 * \addtogroup xgNutArchAvr32Init
 */
/*@{*/

#ifndef NUT_THREAD_MAINSTACK
#define NUT_THREAD_MAINSTACK    1024
#endif

/* Unknown optimized value */
#ifndef NUT_THREAD_IDLESTACK
#define NUT_THREAD_IDLESTACK    512
#endif


extern void *__heap_start;

extern void *__ram_start__;
extern void *__ram_size__;

/*!
* \brief Last memory address.
*/
#undef NUTMEM_START
#define NUTMEM_START ((uint32_t)&__ram_start__)

#undef NUTMEM_SIZE
#define NUTMEM_SIZE ((uint32_t)&__ram_size__)

#define NUTMEM_END (uptr_t)(NUTMEM_START + NUTMEM_SIZE - 1U)
extern void *__heap_start;

#define HEAP_START  &__heap_start
#define HEAP_SIZE  ((uptr_t) (NUTMEM_END - 256 - (uptr_t) (&__heap_start)))


#if !defined(__cplusplus)
extern void NutAppMain(void *arg) NUT_NORETURN_FUNC;
#else
extern void main(void *);
#endif


/*!
 * \brief Idle thread.
 *
 * \param arg Ignored by the idle thread.
 *
 * This function runs in an endless loop as a lowest priority thread.
 */
THREAD(NutIdle, arg)
{
    /* Init INTC */
    init_interrupts();

    /* Initialize system timers. */
    NutTimerInit();

    /* Read OS configuration from non-volatile memory. We can't do this
     ** earlier, because the low level driver may be interrupt driven. */
    NutLoadConfig();

    /* Create the main application thread. Watch this carefully when
     ** changing compilers and compiler versions. Some handle main()
     ** in a special way, like setting the stack pointer and other
     ** weird stuff that may break this code. */
    NutThreadCreate("main", main, 0, (NUT_THREAD_MAINSTACK * NUT_THREAD_STACK_MULT) + NUT_THREAD_STACK_ADD);

    /*
     * Run in an idle loop at the lowest priority. We can still
     * do something useful here, like killing terminated threads
     * or putting the CPU into sleep mode.
     */
    NutThreadSetPriority(254);
    for (;;) {
        NutThreadYield();
        NutThreadDestroy();
    }
}

/*!
 * \brief Nut/OS Initialization.
 *
 * Initializes the memory management and the thread system and starts
 * an idle thread, which in turn initializes the timer management.
 * Finally the application's main() function is called.
 */
void NutInit(void)
{
    Avr32InitClockTree();

#ifdef EARLY_STDIO_DEV
    /* We may optionally initialize stdout as early as possible.
     ** Be aware, that no heap is available and no threads are
     ** running. We need a very basic driver here, which won't
     ** use interrupts or call malloc, NutEventXxx, NutSleep etc. */
    {
        extern NUTFILE *__fds[FOPEN_MAX];
        extern FILE *__iob[FOPEN_MAX];
 
        extern NUTDEVICE EARLY_STDIO_DEV;
        static struct __iobuf early_stdout;
        /* Initialize the output device. */
        EARLY_STDIO_DEV.dev_init(&EARLY_STDIO_DEV);
        /* Assign a static iobuf. */
        stdout = &early_stdout;
        /* Open the device. */
        __fds[1] = (int) EARLY_STDIO_DEV.dev_open(&EARLY_STDIO_DEV, "", 0, 0);
        __iob[1] = stdout;

        stdout->iob_fd = 1;
        /* Set the mode. No idea if this is required. */
        stdout->iob_mode = _O_WRONLY | _O_CREAT | _O_TRUNC;

        /* A first trial. */
        puts("\nStarting Nut/OS");
    }
#endif

    /* Initialize our heap memory. */
    NutHeapAdd(HEAP_START, HEAP_SIZE);

    /* Create idle thread. Note, that the first call to NutThreadCreate
     ** will never return. */
    NutThreadCreate("idle", NutIdle, 0, (NUT_THREAD_IDLESTACK * NUT_THREAD_STACK_MULT) + NUT_THREAD_STACK_ADD);
}

/*@}*/