/*
 * Copyright (C) 2018 Gunar Schorcht
 *
 * This file is subject to the terms and conditions of the GNU Lesser
 * General Public License v2.1. See the file LICENSE in the top level
 * directory for more details.
 */

/**
 * @ingroup     cpu_esp32
 * @{
 *
 * @file
 * @brief       Implementation of the kernels irq interface
 *
 * @author      Gunar Schorcht <gunar@schorcht.net>
 *
 * @}
 */

#ifndef IRQ_ARCH_H
#define IRQ_ARCH_H

#include "irq.h"
#include "sched.h"
#include "thread.h"

#ifdef __cplusplus
extern "C" {
#endif

/**
 * @brief   Indicates the interrupt nesting depth
 *
 * The variable is increment on entry into and decremented on exit from an ISR.
 */
extern volatile uint32_t irq_interrupt_nesting;

/**
 * @name   CPU interrupt numbers
 *
 * All interrupts that are used for RIOT-OS are preallocated and fix.
 * The allocated interrupts are all level interrupts, most of them with
 * low priority.
 *
 * @{
 */
#define CPU_INUM_GPIO       2   /**< Level interrupt with low priority 1 */
#define CPU_INUM_CAN        3   /**< Level interrupt with low priority 1 */
#define CPU_INUM_UART       5   /**< Level interrupt with low priority 1 */
#define CPU_INUM_RTC        9   /**< Level interrupt with low priority 1 */
#define CPU_INUM_I2C        12  /**< Level interrupt with low priority 1 */
#define CPU_INUM_WDT        13  /**< Level interrupt with low priority 1 */
#define CPU_INUM_SOFTWARE   17  /**< Level interrupt with low priority 1 */
#define CPU_INUM_ETH        18  /**< Level interrupt with low priority 1 */
#define CPU_INUM_TIMER      19  /**< Level interrupt with medium priority 2 */
/** @} */

/**
 * @name   Macros to enter and exit an ISR
 *
 * Since all the stuff is done in `_frxt_int_enter` and `_frxt_int_exit`, these
 * macros are doing nothing and are kept only for source code compatibility.
 *
 * @{
 */
#define irq_isr_enter()
#define irq_isr_exit()
/** @} */

/**
 * @name   Macros to enter and exit a critical region
 *
 * @note: since they use a local variable they can be used only in same function
 *
 * @{
 */
#define critical_enter()   int _irq_state = irq_disable()
#define critical_exit()    irq_restore(_irq_state)
/** @} */

/**
 * @name   Macros to enter and exit a critical region with state variable
 * @{
 */
#define critical_enter_var(m)   m = irq_disable()
#define critical_exit_var(m)    irq_restore(m)
/** @} */

#ifdef __cplusplus
}
#endif

#endif /* IRQ_ARCH_H */