text: /*
   * Copyright (c) 2014 Wind River Systems, Inc.
   *
   * SPDX-License-Identifier: Apache-2.0
   */
  
  /**
   * @file
   * @brief ARCv2 interrupt management
   *
   *
   * Interrupt management:
   *
   * - enabling/disabling
   *
   * An IRQ number passed to the @a irq parameters found in this file is a
   * number from 16 to last IRQ number on the platform.
   */
  
  #include <kernel.h>
  #include <arch/cpu.h>
  #include <misc/__assert.h>
  #include <toolchain.h>
  #include <linker/sections.h>
  #include <sw_isr_table.h>
  #include <irq.h>
  #include <misc/printk.h>
  
  /*
   * @brief Enable an interrupt line
   *
   * Clear possible pending interrupts on the line, and enable the interrupt
   * line. After this call, the CPU will receive interrupts for the specified
   * @a irq.
   *
   * @return N/A
   */
  
  void z_arch_irq_enable(unsigned int irq)
  {
  	unsigned int key = irq_lock();
  
  	z_arc_v2_irq_unit_int_enable(irq);
  	irq_unlock(key);
  }
  
  /*
   * @brief Disable an interrupt line
   *
   * Disable an interrupt line. After this call, the CPU will stop receiving
   * interrupts for the specified @a irq.
   *
   * @return N/A
   */
  
  void z_arch_irq_disable(unsigned int irq)
  {
  	unsigned int key = irq_lock();
  
  	z_arc_v2_irq_unit_int_disable(irq);
  	irq_unlock(key);
  }
  
  /*
   * @internal
   *
   * @brief Set an interrupt's priority
   *
   * Lower values take priority over higher values. Special case priorities are
   * expressed via mutually exclusive flags.
  
   * The priority is verified if ASSERT_ON is enabled; max priority level
   * depends on CONFIG_NUM_IRQ_PRIO_LEVELS.
   *
   * @return N/A
   */
  
  void z_irq_priority_set(unsigned int irq, unsigned int prio, u32_t flags)
  {
  	ARG_UNUSED(flags);
  
  	unsigned int key = irq_lock();
  
  	__ASSERT(prio < CONFIG_NUM_IRQ_PRIO_LEVELS,
  		 "invalid priority %d for irq %d", prio, irq);
  	z_arc_v2_irq_unit_prio_set(irq, prio);
  	irq_unlock(key);
  }
  
  /*
   * @brief Spurious interrupt handler
   *
   * Installed in all dynamic interrupt slots at boot time. Throws an error if
   * called.
   *
   * @return N/A
   */
  
  void z_irq_spurious(void *unused)
  {
  	ARG_UNUSED(unused);
  	printk("z_irq_spurious(). Spinning...\n");
  	for (;;) {
  		;
  	}
  }
  
  #ifdef CONFIG_DYNAMIC_INTERRUPTS
  int z_arch_irq_connect_dynamic(unsigned int irq, unsigned int priority,
  			      void (*routine)(void *parameter), void *parameter,
  			      u32_t flags)
  {
  	z_isr_install(irq, routine, parameter);
  	z_irq_priority_set(irq, priority, flags);
  	return irq;
  }
  #endif /* CONFIG_DYNAMIC_INTERRUPTS */
  