Subversion Repositories openrisc

/*  bspstart.c

 *

 *  This set of routines starts the application.  It includes application,

 *  board, and monitor specific initialization and configuration.

 *  The generic CPU dependent initialization has been performed

 *  before any of these are invoked.

 *

 *  COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994, 1997.

 *  On-Line Applications Research Corporation (OAR).

 *  All rights assigned to U.S. Government, 1994.

 *

 *  $Id: bspstart.c,v 1.2 2001-09-27 12:00:35 chris Exp $

 */

#include <bsp.h>

#include <rtems/libio.h>

#include <libcsupport.h>

#include <string.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;

rtems_unsigned32                  bsp_isr_level;

/*

 *  Use the shared implementations of the following routines

 */

void bsp_postdriver_hook(void);

void bsp_libc_init( void *, unsigned32, int );

/*PAGE

 *

 *  bsp_pretasking_hook

 *

 *  BSP pretasking hook.  Called just before drivers are initialized.

 *  Used to setup libc and install any BSP extensions.

 */

void bsp_pretasking_hook(void)

{

  extern int end;

  rtems_unsigned32 heap_start;

  rtems_unsigned32 heap_size;

  heap_start = (rtems_unsigned32) &end;

  if (heap_start & (CPU_ALIGNMENT-1))

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

  heap_size = BSP_Configuration.work_space_start - (void *)&end;

  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

}

/*  PAGE

 *

 *  bsp_predriver_hook

 *

 *  Initialization before drivers are setup.

 */

void bsp_predriver_hook(void)

{

  initialize_external_exception_vector();

}

/*PAGE

 *

 *  bsp_start

 *

 *  This routine does the bulk of the system initialization.

 */

void bsp_start( void )

{

  unsigned char *work_space_start;

  unsigned int  msr_value = 0x2030;

  /*

   * Set BSP to initial value. Note: This value is a guess

   * check how the real board comes up. This is critical to

   * getting the source to work with the debugger.

   */

  _CPU_MSR_SET( msr_value );

  /*

   *  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".

   */

  work_space_start =

    (unsigned char *)&RAM_END - BSP_Configuration.work_space_size;

  if ( work_space_start <= (unsigned char *)&end ) {

    DEBUG_puts( "bspstart: Not enough RAM!!!\n" );

    bsp_cleanup();

  }

  BSP_Configuration.work_space_start = work_space_start;

  /*

   *  initialize the CPU table for this BSP

   */

  Cpu_table.exceptions_in_RAM = TRUE;

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

  Cpu_table.predriver_hook    = bsp_predriver_hook;

  Cpu_table.postdriver_hook   = bsp_postdriver_hook;

  /* Cpu_table.clicks_per_usec   = 66666667 / 4000000; */

  Cpu_table.clicks_per_usec   = 66666667 / 4000000 / 2;

  Cpu_table.do_zero_of_workspace = TRUE;

  Cpu_table.interrupt_stack_size = CONFIGURE_INTERRUPT_STACK_MEMORY;

  /*

   *  Enable whatever caching is desired

   */

#if ( PPC_USE_INSTRUCTION_CACHE )

  powerpc_instruction_cache_enable ();

#endif

#if ( PPC_USE_DATA_CACHE )

  powerpc_data_cache_enable ();

#endif

}