source: rtems/c/src/lib/libbsp/no_cpu/no_bsp/startup/bspstart.c @ 7f6a24ab

/*  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 <shm.h>
#include <libcsupport.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()
{
    extern int end;
    rtems_unsigned32        heap_start;

    heap_start = (rtems_unsigned32) &end;
    if (heap_start & (CPU_ALIGNMENT-1))
        heap_start = (heap_start + CPU_ALIGNMENT) & ~(CPU_ALIGNMENT-1);

    /*
     *  The last parameter to RTEMS_Malloc_Initialize is the "chunk"
     *  size which a multiple of will be requested on each sbrk()
     *  call by malloc().  A value of 0 indicates that sbrk() should
     *  not be called to extend the heap.
     */

    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
}

int bsp_start(
  int argc,
  char **argv,
  char **environp
)
{
  /*
   *  Allocate the memory for the RTEMS Work Space.  This can come from
   *  a variety of places: hard coded address, malloc'ed from outside
   *  RTEMS world (e.g. simulator or primitive memory manager), or (as
   *  typically done by stock BSPs) by subtracting the required amount
   *  of work space from the last physical address on the CPU board.
   */

  /*
   *  Copy the Configuration Table .. so we can change it
   */

  BSP_Configuration = Configuration;

  /*
   * Add 1 region for the RTEMS Malloc
   */

  BSP_Configuration.maximum_regions++;

  /*
   * Add 1 extension for newlib libc
   */

#ifdef RTEMS_NEWLIB
    BSP_Configuration.maximum_extensions++;
#endif

  /*
   * Add 1 extension for newlib libc
   */

#ifdef RTEMS_NEWLIB
    BSP_Configuration.maximum_extensions++;
#endif

  /*
   *  Need to "allocate" the memory for the RTEMS Workspace and
   *  tell the RTEMS configuration where it is.  This memory is
   *  not malloc'ed.  It is just "pulled from the air".
   */

  BSP_Configuration.work_space_start = (void *) 0;

  /*
   *  initialize the CPU table for this BSP
   */

  /*
   *  we do not use the pretasking_hook
   */

  Cpu_table.pretasking_hook = NULL;

  Cpu_table.predriver_hook = bsp_libc_init;    /* RTEMS resources available */

  Cpu_table.postdriver_hook = NULL;

  Cpu_table.idle_task = NULL;  /* do not override system IDLE task */

  Cpu_table.do_zero_of_workspace = TRUE;

  Cpu_table.interrupt_stack_size = 4096;

  Cpu_table.extra_system_initialization_stack = 0;

  /*
   *  Don't forget the other CPU Table entries.
   */

  /*
   *  Start RTEMS
   */

  rtems_initialize_executive( &BSP_Configuration, &Cpu_table );

  bsp_cleanup();

  return 0;
}