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/*

 *  Hitachi H8300 CPU Dependent Source

 *

 *  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.

 *

 *  cpu.c,v 1.1 2000/06/29 23:00:48 joel Exp

 */

#include <rtems/system.h>

#include <rtems/score/isr.h>

#include <rtems/score/wkspace.h>

/*  _CPU_Initialize

 *

 *  This routine performs processor dependent initialization.

 *

 *  INPUT PARAMETERS:

 *    cpu_table       - CPU table to initialize

 *    thread_dispatch - address of disptaching routine

 */

void _CPU_Initialize(

  rtems_cpu_table  *cpu_table,

  void      (*thread_dispatch)      /* ignored on this CPU */

)

{

  /*

   *  The thread_dispatch argument is the address of the entry point

   *  for the routine called at the end of an ISR once it has been

   *  decided a context switch is necessary.  On some compilation

   *  systems it is difficult to call a high-level language routine

   *  from assembly.  This allows us to trick these systems.

   *

   *  If you encounter this problem save the entry point in a CPU

   *  dependent variable.

   */

  _CPU_Thread_dispatch_pointer = thread_dispatch;

  /*

   *  If there is not an easy way to initialize the FP context

   *  during Context_Initialize, then it is usually easier to

   *  save an "uninitialized" FP context here and copy it to

   *  the task's during Context_Initialize.

   */

  /* FP context initialization support goes here */

  _CPU_Table = *cpu_table;

}

/*PAGE

 *

 *  _CPU_ISR_Get_level

 *

 *  This routine returns the current interrupt level.

 */

unsigned32 _CPU_ISR_Get_level( void )

{

  unsigned int _ccr;

#if defined(__H8300__)

#warning "How do we get ccr on base CPU models"

#else

  asm volatile ( "stc ccr, %0" : "=m" (_ccr) : );

#endif

  if ( _ccr & 0x80 )

    return 1;

  return 0;

}

/*PAGE

 *

 *  _CPU_ISR_install_raw_handler

 */

void _CPU_ISR_install_raw_handler(

  unsigned32  vector,

  proc_ptr    new_handler,

  proc_ptr   *old_handler

)

{

  /*

   *  This is where we install the interrupt handler into the "raw" interrupt

   *  table used by the CPU to dispatch interrupt handlers.

   *  Use Debug level IRQ Handlers

   */

  H8BD_Install_IRQ(vector,new_handler,old_handler);

}

/*PAGE

 *

 *  _CPU_ISR_install_vector

 *

 *  This kernel routine installs the RTEMS handler for the

 *  specified vector.

 *

 *  Input parameters:

 *    vector      - interrupt vector number

 *    old_handler - former ISR for this vector number

 *    new_handler - replacement ISR for this vector number

 *

 *  Output parameters:  NONE

 *

 */

void _CPU_ISR_install_vector(

  unsigned32  vector,

  proc_ptr    new_handler,

  proc_ptr   *old_handler

)

{

   *old_handler = _ISR_Vector_table[ vector ];

   /*

    *  If the interrupt vector table is a table of pointer to isr entry

    *  points, then we need to install the appropriate RTEMS interrupt

    *  handler for this vector number.

    */

   _CPU_ISR_install_raw_handler( vector, new_handler, old_handler );

   /*

    *  We put the actual user ISR address in '_ISR_vector_table'.  This will

    *  be used by the _ISR_Handler so the user gets control.

    */

    _ISR_Vector_table[ vector ] = new_handler;

}

/*PAGE

 *

 *  _CPU_Install_interrupt_stack

 */

void _CPU_Install_interrupt_stack( void )

{

}

/*PAGE

 *

 *  _CPU_Thread_Idle_body

 *

 *  NOTES:

 *

 *  1. This is the same as the regular CPU independent algorithm.

 *

 *  2. If you implement this using a "halt", "idle", or "shutdown"

 *     instruction, then don't forget to put it in an infinite loop.

 *

 *  3. Be warned. Some processors with onboard DMA have been known

 *     to stop the DMA if the CPU were put in IDLE mode.  This might

 *     also be a problem with other on-chip peripherals.  So use this

 *     hook with caution.

 */

#if 0

void _CPU_Thread_Idle_body( void )

{

  for( ; ; )

    IDLE_Monitor();

        /*asm(" sleep   \n"); */

    /* insert your "halt" instruction here */ ;

}

#endif