source: rtems/c/src/lib/libbsp/i386/go32/startup/bspstart.c @ 6cc85032

/*  bsp_start()
 *
 *  This routine starts the application.  It includes application,
 *  board, and monitor specific initialization and configuration.
 *  The generic CPU dependent initialization has been performed
 *  before this routine is invoked.
 * 
 *  INPUT:  NONE
 * 
 *  OUTPUT: NONE
 *
 *  COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994.
 *  On-Line Applications Research Corporation (OAR).
 *  All rights assigned to U.S. Government, 1994.
 *
 *  This material may be reproduced by or for the U.S. Government pursuant
 *  to the copyright license under the clause at DFARS 252.227-7013.  This
 *  notice must appear in all copies of this file and its derivatives.
 *
 *  $Id$
 */

#include <rtems.h>
#include <bsp.h>
#include <cpu.h>
#include <libcsupport.h>

#include <stackchk.h>

/*
 *  The original table from the application and our copy of it with
 *  some changes.
 */

extern rtems_configuration_table  Configuration;
rtems_configuration_table  BSP_Configuration;

rtems_cpu_table Cpu_table;

/*      Initialize whatever libc we are using
 *      called from postdriver hook
 */

void bsp_libc_init()
{
    rtems_unsigned32        heap_start;

#if 0
    extern int end;
    heap_start = (rtems_unsigned32) &end;
#else
    void * sbrk( int );
    heap_start = (rtems_unsigned32) sbrk( 64 * 1024 + CPU_ALIGNMENT );
#endif
    if (heap_start & (CPU_ALIGNMENT-1))
        heap_start = (heap_start + CPU_ALIGNMENT) & ~(CPU_ALIGNMENT-1);

    RTEMS_Malloc_Initialize((void *) heap_start, 64 * 1024, 0);

    /*
     * Set up for the libc handling.
     */

    if (BSP_Configuration.ticks_per_timeslice > 0)
        libc_init(1);                /* reentrant if possible */
    else
        libc_init(0);                /* non-reentrant */

    /*
     *  Initialize the stack bounds checker
     */

#ifdef STACK_CHECKER_ON
    Stack_check_Initialize();
#endif

}

void bsp_start()
{
    extern void * sbrk( int );

    Cpu_table.pretasking_hook           = NULL;
    Cpu_table.predriver_hook = bsp_libc_init;  /* RTEMS resources available */
    Cpu_table.postdriver_hook = NULL;   /* Call our main() for constructors */
    Cpu_table.idle_task = NULL;  /* do not override system IDLE task */
    Cpu_table.do_zero_of_workspace      = TRUE;
    Cpu_table.interrupt_table_segment   = 0;/* get_ds(); */
    Cpu_table.interrupt_table_offset    = (void *)0;
    Cpu_table.interrupt_stack_size      = 4096;
    Cpu_table.extra_system_initialization_stack = 0;

    /*
     *  Copy the table
     */
    BSP_Configuration = Configuration;

    BSP_Configuration.work_space_start = sbrk( Configuration.work_space_size );
    if ( BSP_Configuration.work_space_start == 0 )  {
        /* Big trouble */
        int     write( int, void *, int );
        void    _exit( int );
        char    msg[] = "bsp_start() couldn't sbrk() RTEMS work space\n";
        write( 2, msg, sizeof msg - 1 );
        _exit( 1 );
    }

    /*
     * Add 1 region for Malloc in libc_low
     */

    BSP_Configuration.maximum_regions++;

    /*
     * Add 1 extension for newlib libc
     */

#ifdef RTEMS_NEWLIB
    BSP_Configuration.maximum_extensions++;
#endif

    /*
     * Add another extension if using the stack checker
     */

#ifdef STACK_CHECKER_ON
    BSP_Configuration.maximum_extensions++;
#endif

    rtems_initialize_executive( &BSP_Configuration, &Cpu_table );
    /* does not return */

    /* no cleanup necessary for GO32 */
}