path: root/cpukit/score/cpu/no_cpu/cpu.c

/**
 *  @file
 *
 *  @brief No 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.rtems.org/license/LICENSE.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <rtems/score/isr.h>

void _CPU_Initialize(void)
{
  /*
   *  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 */
}

uint32_t   _CPU_ISR_Get_level( void )
{
  /*
   *  This routine returns the current interrupt level.
   */

  return 0;
}

/*
 *  _CPU_ISR_install_raw_handler
 *
 *  NO_CPU Specific Information:
 *
 *  XXX document implementation including references if appropriate
 */

void _CPU_ISR_install_raw_handler(
  uint32_t             vector,
  CPU_ISR_raw_handler  new_handler,
  CPU_ISR_raw_handler *old_handler
)
{
  /*
   *  This is where we install the interrupt handler into the "raw" interrupt
   *  table used by the CPU to dispatch interrupt handlers.
   */
}

void _CPU_ISR_install_vector(
  uint32_t         vector,
  CPU_ISR_handler  new_handler,
  CPU_ISR_handler *old_handler
)
{
  CPU_ISR_raw_handler ignored;

  *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, _ISR_Handler, &ignored );

  /*
   *  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;
}

/*
 *  _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.
 *
 *  NO_CPU Specific Information:
 *
 *  XXX document implementation including references if appropriate
 */

void *_CPU_Thread_Idle_body( uintptr_t ignored )
{

  for( ; ; )
    /* insert your "halt" instruction here */ ;
}