text: /****************************************************************************
   * arch/sh/src/m16c/m16c_irq.c
   *
   *   Copyright (C) 2009, 2011 Gregory Nutt. All rights reserved.
   *   Author: Gregory Nutt <gnutt@nuttx.org>
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   * 3. Neither the name NuttX nor the names of its contributors may be
   *    used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
   * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
   * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
   * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
   * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
   * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
   * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
   * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   * POSSIBILITY OF SUCH DAMAGE.
   *
   ****************************************************************************/
  
  /****************************************************************************
   * Included Files
   ****************************************************************************/
  
  #include <nuttx/config.h>
  
  #include <stdint.h>
  #include <nuttx/arch.h>
  #include <nuttx/irq.h>
  
  #include "up_internal.h"
  
  /****************************************************************************
   * Pre-processor Definitions
   ****************************************************************************/
  
  /****************************************************************************
   * Public Data
   ****************************************************************************/
  
  /* This holds a references to the current interrupt level register storage
   * structure.  If is non-NULL only during interrupt processing.
   */
  
  volatile uint32_t *current_regs; /* Actually a pointer to the beginning of a uint8_t array */
  
  /****************************************************************************
   * Private Data
   ****************************************************************************/
  
  /****************************************************************************
   * Private Functions
   ****************************************************************************/
  
  /****************************************************************************
   * Public Functions
   ****************************************************************************/
  
  /****************************************************************************
   * Name: up_irqinitialize
   ****************************************************************************/
  
  void up_irqinitialize(void)
  {
    current_regs = NULL;
  
    /* And finally, enable interrupts */
  
  #ifndef CONFIG_SUPPRESS_INTERRUPTS
    asm("fset i");
  #endif
  }
  
  /****************************************************************************
   * Name: up_disable_irq
   *
   * Description:
   *   On many architectures, there are three levels of interrupt enabling: (1)
   *   at the global level, (2) at the level of the interrupt controller,
   *   and (3) at the device level.  In order to receive interrupts, they
   *   must be enabled at all three levels.
   *
   *   This function implements disabling of the device specified by 'irq'
   *   at the interrupt controller level if supported by the architecture
   *   (irqsave() supports the global level, the device level is hardware
   *   specific).
   *
   ****************************************************************************/
  
  #ifndef CONFIG_ARCH_NOINTC
  void up_disable_irq(int irq)
  {
    /* There are no ez80 interrupt controller settings to disable IRQs */
  }
  
  /****************************************************************************
   * Name: up_enable_irq
   *
   * Description:
   *   This function implements enabling of the device specified by 'irq'
   *   at the interrupt controller level if supported by the architecture
   *   (irqsave() supports the global level, the device level is hardware
   *   specific).
   *
   ****************************************************************************/
  
  void up_enable_irq(int irq)
  {
    /* There are no ez80 interrupt controller settings to enable IRQs */
  }
  
  #endif /* CONFIG_ARCH_NOINTC */
  