Subversion Repositories openrisc_2011-10-31

/*

 *  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) 1989-1999.

 *  On-Line Applications Research Corporation (OAR).

 *

 *  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.

 *

 *  $Id: bspstart.c,v 1.2 2001-09-27 11:59:42 chris Exp $

 */

#include <bsp.h>

#include <rtems/libio.h>

#include <libcsupport.h>

#include <string.h>

#ifndef lint

static char _sccsid[] = "@(#)bspstart.c 09/11/96     1.15\n";

#endif

/*

 *  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;

char *rtems_progname;

/*      Initialize whatever libc we are using

 *      called from postdriver hook

 */

#define HEAP_BLOCK_SIZE (16 * 1024)

rtems_unsigned32        heap_size = 0;

rtems_unsigned32        heap_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)

{

   /* allocate a maximum of 2 megabytes for the heap */

    heap_size = 2 * 1024 * 1024;

    /* allocate all remaining memory to the heap */

    do {

       heap_size -= HEAP_BLOCK_SIZE;

       heap_start = _sysalloc( heap_size );

    } while ( !heap_start );

    if (!heap_start)

       rtems_fatal_error_occurred( heap_size );

    if (heap_start & (CPU_ALIGNMENT-1))

        heap_start = (heap_start + CPU_ALIGNMENT) & ~(CPU_ALIGNMENT-1);

    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.

 */

int bsp_start(

  int argc,

  char **argv,

  char **environp

)

{

  if ((argc > 0) && argv && argv[0])

    rtems_progname = argv[0];

  else

    rtems_progname = "RTEMS";

  /* set the PIA0 register wait states */

  *(volatile unsigned32 *)0x80000020 = 0x04080000;

  /*

   *  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.

   */

  /*

   *  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 = _sysalloc( BSP_Configuration.work_space_size + 512 );

  if (!BSP_Configuration.work_space_start)

    rtems_fatal_error_occurred( BSP_Configuration.work_space_size );

  BSP_Configuration.work_space_start = (void *) ((unsigned int)((char *)BSP_Configuration.work_space_start + CPU_ALIGNMENT) & ~(CPU_ALIGNMENT-1));

  /*

   *  initialize the CPU table for this BSP

   */

  Cpu_table.pretasking_hook = bsp_pretasking_hook;  /* init libc, etc. */

  Cpu_table.postdriver_hook = bsp_postdriver_hook;

  Cpu_table.interrupt_stack_size = CONFIGURE_INTERRUPT_STACK_MEMORY;

  _settrap( 109,&a29k_enable_sup);

  _settrap( 110,&a29k_disable_sup);

  _settrap( 111,&a29k_enable_all_sup);

  _settrap( 112,&a29k_disable_all_sup);

  _settrap( 106,&a29k_context_switch_sup);

  _settrap( 107,&a29k_context_restore_sup);

  _settrap( 108,&a29k_context_save_sup);

  _settrap( 105,&a29k_sigdfl_sup);

  /*

   *  Start RTEMS

   */

  rtems_initialize_executive( &BSP_Configuration, &Cpu_table );

  bsp_cleanup();

  return 0;

}