source: rtems/c/src/lib/libbsp/i386/i386ex/startup/bspstart.c @ bd8c8b2a

/*
 *  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.
 *
 *  COPYRIGHT (c) 1989-1998.
 *  On-Line Applications Research Corporation (OAR).
 *  Copyright assigned to U.S. Government, 1994.
 *
 *  The license and distribution terms for this file may be
 *  found in the file LICENSE in this distribution or at
 *  http://www.OARcorp.com/rtems/license.html.
 *
 *  Ported to the i386ex and submitted by:
 *
 *    Erik Ivanenko 
 *    University of Toronto
 *    erik.ivanenko@utoronto.ca
 *  
 *  $Id$
 */

#include <bsp.h>
#include <rtems/libio.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;

/*
 *  Tells us where to put the workspace in case remote debugger is present.
 */

extern rtems_unsigned32  rdb_start;

/*
 *  Use the shared implementations of the following routines
 */
 
void bsp_postdriver_hook(void);
void bsp_libc_init( void *, unsigned32, int );

/*
 *  Function:   bsp_pretasking_hook
 *  Created:    95/03/10
 *
 *  Description:
 *      BSP pretasking hook.  Called just before drivers are initialized.
 *      Used to setup libc and install any BSP extensions.
 *
 *  NOTES:
 *      Must not use libc (to do io) from here, since drivers are
 *      not yet initialized.
 *
 */
 
void bsp_pretasking_hook(void)
{
    extern int heap_bottom;
    rtems_unsigned32 heap_start;
    rtems_unsigned32 heap_size;

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

    heap_size = BSP_Configuration.work_space_start -(void *) heap_start ;
    heap_size &= 0xfffffff0;  /* keep it as a multiple of 16 bytes */

    heap_size &= 0xfffffff0;  /* keep it as a multiple of 16 bytes */
    bsp_libc_init((void *) heap_start, heap_size, 0);

#ifdef RTEMS_DEBUG
    rtems_debug_enable( RTEMS_DEBUG_ALL_MASK );
#endif
}

/*
 *  bsp_start
 *
 *  This routine does the bulk of the system initialization.
 */

void bsp_start( void )
{
  /*
   *  we do not use the pretasking_hook.
   */

  Cpu_table.pretasking_hook = bsp_pretasking_hook;  /* init libc, etc. */
  Cpu_table.postdriver_hook = bsp_postdriver_hook;
  Cpu_table.interrupt_table_segment = get_ds();
  Cpu_table.interrupt_table_offset = (void *)Interrupt_descriptor_table;
  Cpu_table.interrupt_stack_size = 4096;  /* STACK_MINIMUM_SIZE */

#if defined(RTEMS_POSIX_API)
  BSP_Configuration.work_space_size *= 3;
#endif

  BSP_Configuration.work_space_start = (void *)
     RAM_END - BSP_Configuration.work_space_size;

  /*
   *  Account for the console's resources
   */

  /*   console_reserve_resources( &BSP_Configuration ); */
  /*
   * Init rtems_interrupt_management
   */
  rtems_irq_mngt_init();
}