Subversion Repositories openrisc_2011-10-31

/*  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) 1989-1999.

 *  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.

 *

 *  Modifications of respective RTEMS files:

 *  Copyright (c) 1998, National Research Council of Canada

 *

 *  $Id: bspstart.c,v 1.2 2001-09-27 12:00:20 chris Exp $

 */

#include <bsp.h>

#include <page_table.h>

#include <fatal.h>

#include <rtems/libio.h>

#include <libcsupport.h>

#include <string.h>

/*

 *  The original table from the application (in ROM) and our copy of it with

 *  some changes. Configuration is defined in <confdefs.h>. Make sure that

 *  our configuration tables are uninitialized so that they get allocated in

 *  the .bss section (RAM).

 */

extern rtems_configuration_table Configuration;

rtems_configuration_table BSP_Configuration;

rtems_extensions_table user_extension_table;

rtems_cpu_table Cpu_table;

/*

 *  Use the shared implementations of the following routines.

 *  Look in rtems/c/src/lib/libbsp/shared/bsppost.c and

 *  rtems/c/src/lib/libbsp/shared/bsplibc.c.

 */

void bsp_postdriver_hook( void );

void bsp_libc_init( void *, unsigned32, int );

void bsp_pretasking_hook(void);               /* m68k version */

/*

 *  bsp_start()

 *

 *  Board-specific initialization code. Called from the generic boot_card()

 *  function defined in rtems/c/src/lib/libbsp/shared/main.c. That function

 *  does some of the board independent initialization. It is called from the

 *  generic MC680x0 entry point _start() defined in

 *  rtems/c/src/lib/start/m68k/start.s

 *

 *  _start() has set up a stack, has zeroed the .bss section, has turned off

 *  interrupts, and placed the processor in the supervisor mode. boot_card()

 *  has left the processor in that state when bsp_start() was called.

 *

 *  RUNS WITH ADDRESS TRANSLATION AND CACHING TURNED OFF!

 *  ASSUMES THAT THE VIRTUAL ADDRESSES WILL BE IDENTICAL TO THE PHYSICAL

 *  ADDRESSES. Software-controlled address translation would be required

 *  otherwise.

 *

 *  ASSUMES THAT 167BUG IS PRESENT TO CATCH ANY EXCEPTIONS DURING

 *  INITIALIZATION.

 *

 *  Input parameters: NONE

 *

 *  Output parameters: NONE

 *

 *  Return values: NONE

 */

void bsp_start( void )

{

  void M68KFPSPInstallExceptionHandlers (void);

  extern m68k_isr_entry  M68Kvec[];

  extern void           *_WorkspaceBase;

  extern void           *_RamSize;

  extern unsigned long   _M68k_Ramsize;

  m68k_isr_entry *rom_monitor_vector_table;

  int index;

  _M68k_Ramsize = (unsigned long)&_RamSize;             /* RAM size set in linker script */

  /*

   *  167Bug Vectors are at 0xFFE00000

   */

  rom_monitor_vector_table = (m68k_isr_entry *)0xFFE00000;

  m68k_set_vbr( rom_monitor_vector_table );

  /*

   *  Copy 167Bug Bus Error handler into our exception vector. All 167Bug

   *  exception vectors are the same and point to the generalized exception

   *  handler. The bus error handler is the one that Motorola says to copy

   *  (p. 2-13, Debugging Package for Motorola 68K CISC CPUs User's Manual

   *  68KBUG/D1A3, October 1993).

   */

  for ( index=2 ; index<=255 ; index++ )

    M68Kvec[ index ] = rom_monitor_vector_table[ 2 ];

  /* Any exceptions during initialization should be trapped by 167Bug */

  m68k_set_vbr( &M68Kvec );

  /* Install the 68040 FPSP here */

  M68KFPSPInstallExceptionHandlers();

  /*

   *  You may wish to make the VME arbitration round-robin here, currently

   *  we leave it as it is.

   */

  /* Set the Interrupt Base Vectors */

  lcsr->vector_base = (VBR0 << 28) | (VBR1 << 24);

  /*

   *  Initialize address translation

   *  May need to pass the multiprocessor configuration table.

   */

  page_table_init( &Configuration );

  /* We only use a hook to get the C library initialized. */

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

  Cpu_table.postdriver_hook = bsp_postdriver_hook;

  Cpu_table.interrupt_vector_table = (m68k_isr_entry *) &M68Kvec;

  /* Must match value in start.s */

  Cpu_table.interrupt_stack_size = CONFIGURE_INTERRUPT_STACK_MEMORY;

  /*

   *  If the application has not overriden the default User_extension_table,

   *  supply one with our own fatal error handler that returns control to

   *  167Bug.

   */

  if ( BSP_Configuration.User_extension_table == NULL ) {

    user_extension_table.fatal = bsp_fatal_error_occurred;

    BSP_Configuration.User_extension_table = &user_extension_table;

  }

  /*

   *  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 *)&_WorkspaceBase;

}