Subversion Repositories openrisc_me

/*

 *  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).

 *  All rights 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.

 *

 *  $Id: bspstart.c,v 1.2 2001-09-27 12:01:02 chris Exp $

 */

#include <bsp.h>

#include <rtems/libio.h>

#include <libcsupport.h>

#include <string.h>

#include <fcntl.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;

/*

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

 */

#if 0

extern rtems_unsigned32  rdb_start;

#endif

/*

 * Amount to increment itimer by each pass

 * It is a variable instead of a #define to allow the 'looptest'

 * script to bump it without recompiling rtems

 *

 *  NOTE:  This is based on the PA-RISC simulator.  I don't know if we

 *         can actually pull this trick on the PPC simulator.

 */

rtems_unsigned32 CPU_PPC_CLICKS_PER_TICK;

#if PSIM_FAST_IDLE

/*

 * Many of the tests are very slow on the simulator because they have

 * have 5 second delays hardwired in.

 *

 * Try to speed those tests up by speeding up the clock when in the idle task.

 *

 *  NOTE:  At the current setting, 5 second delays in the tests take

 *         approximately 5 seconds of wall time.

 */

rtems_extension fast_idle_switch_hook(

  rtems_tcb *current_task,

  rtems_tcb *heir_task

)

{

    static rtems_unsigned32 normal_clock = ~0;

    static rtems_unsigned32 fast_clock;

    /* init our params on first call */

    if (normal_clock == (rtems_unsigned32) ~0)

    {

        normal_clock = CPU_PPC_CLICKS_PER_TICK;

        fast_clock = 10000;

#if 0

        fast_clock = CPU_PPC_CLICKS_PER_TICK / 0x10 ;

#endif

        if (fast_clock == 0)    /* handle pathological case */

            fast_clock++;

    }

    /*

     * Run the clock faster when idle is in place.

     */

    if (heir_task == _Thread_Idle)

        CPU_PPC_CLICKS_PER_TICK = fast_clock;

    else if (current_task == _Thread_Idle)

        CPU_PPC_CLICKS_PER_TICK = normal_clock;

}

#endif

/*

 *  Use the shared implementations of the following routines

 */

void bsp_postdriver_hook(void);

void bsp_libc_init( void *, unsigned32, int );

/*

 *  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);

#if PSIM_FAST_IDLE

  /*

   *  Install the fast idle task switch extension

   *

   *  On MP systems, might not want to do this; it confuses at least

   *  one test (mp06) on the PA-RISC simulator

   */

#if 0

  if (BSP_Configuration.User_multiprocessing_table == 0)

#endif

  {

    rtems_extensions_table  fast_idle_extension;

    rtems_id                extension_id;

    rtems_status_code       rc;

    memset(&fast_idle_extension, 0, sizeof(fast_idle_extension));

    fast_idle_extension.thread_switch  = fast_idle_switch_hook;

    rc = rtems_extension_create(

      rtems_build_name('F', 'D', 'L', 'E'),

      &fast_idle_extension,

      &extension_id

    );

    if (rc != RTEMS_SUCCESSFUL)

      rtems_fatal_error_occurred(rc);

  }

#endif

#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 )

{

  unsigned char *work_space_start;

#if 0

  /*

   * Set MSR to show vectors at 0 XXX

   */

  _CPU_MSR_Value( msr_value );

  msr_value &= ~PPC_MSR_EP;

  _CPU_MSR_SET( msr_value );

#endif

  /*

   * Set up our hooks

   * Make sure libc_init is done before drivers initialized so that

   * they can use atexit()

   */

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

  Cpu_table.postdriver_hook = bsp_postdriver_hook;

  /*

   *  Is this true?

   *

   *  PSIM does zero out memory BUT only when IT begins execution.  Thus

   *  if we want to have a clean slate in the workspace each time we

   *  begin execution of OUR application, then we must zero the workspace.

   *

   *  It is true that it takes simulated time to clear the memory.

   */

  Cpu_table.do_zero_of_workspace = FALSE;

  Cpu_table.interrupt_stack_size = CONFIGURE_INTERRUPT_STACK_MEMORY;

  /*

   *  The monitor likes the exception table to be at 0x0.

   */

  Cpu_table.exceptions_in_RAM = TRUE;

/*

#if defined(RTEMS_POSIX_API)

  BSP_Configuration.work_space_size *= 3;

#endif

*/

  BSP_Configuration.work_space_size += 1024;

#if 0

  work_space_start =

    (unsigned char *)rdb_start - BSP_Configuration.work_space_size;

#endif

  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;

#if PSIM_FAST_IDLE

  /*

   * Add 1 extension for fast idle

   */

  BSP_Configuration.maximum_extensions++;

#endif

  /*

   * Set the "clicks per tick" for the simulator

   *  used by XXX/clock/clock.c to schedule interrupts

   *

   *  NOTE: On psim, each click of the decrementer register corresponds

   *        to 1 instruction.  By setting this to 100, we are indicating

   *        that we are assuming it can execute 100 instructions per

   *        microsecond.  This corresponds to sustaining 1 instruction

   *        per cycle at 100 Mhz.  Whether this is a good guess or not

   *        is anyone's guess.

   */

  {

    extern int PSIM_INSTRUCTIONS_PER_MICROSECOND;

    CPU_PPC_CLICKS_PER_TICK = BSP_Configuration.microseconds_per_tick *

      (int) &PSIM_INSTRUCTIONS_PER_MICROSECOND;

  }

}