/*
 * Copyright (c) 2006-2021, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author       Notes
 * 2018/10/01     Bernard      The first version
 * 2018/12/27     Jesven       Change irq enable/disable to cpu0
 */
#include <plic.h>
#include <mmu.h>
#include "tick.h"
#include "encoding.h"
#include "riscv.h"
#include "interrupt.h"

struct rt_irq_desc irq_desc[MAX_HANDLERS];

static rt_isr_handler_t rt_hw_interrupt_handle(rt_uint32_t vector, void *param)
{
    rt_kprintf("UN-handled interrupt %d occurred!!!\n", vector);
    return RT_NULL;
}

int rt_hw_plic_irq_enable(int irq_number)
{
    plic_irq_enable(irq_number);
    return 0;
}

int rt_hw_plic_irq_disable(int irq_number)
{
    plic_irq_disable(irq_number);
    return 0;
}

/**
 * This function will un-mask a interrupt.
 * @param vector the interrupt number
 */
void rt_hw_interrupt_umask(int vector)
{
    plic_set_priority(vector, 1);

    rt_hw_plic_irq_enable(vector);
}

/**
 * This function will install a interrupt service routine to a interrupt.
 * @param vector the interrupt number
 * @param new_handler the interrupt service routine to be installed
 * @param old_handler the old interrupt service routine
 */
rt_isr_handler_t rt_hw_interrupt_install(int vector, rt_isr_handler_t handler,
        void *param, const char *name)
{
    rt_isr_handler_t old_handler = RT_NULL;

    if(vector < MAX_HANDLERS)
    {
        old_handler = irq_desc[vector].handler;
        if (handler != RT_NULL)
        {
            irq_desc[vector].handler = (rt_isr_handler_t)handler;
            irq_desc[vector].param = param;
#ifdef RT_USING_INTERRUPT_INFO
            rt_snprintf(irq_desc[vector].name, RT_NAME_MAX - 1, "%s", name);
            irq_desc[vector].counter = 0;
#endif
        }
    }

    return old_handler;
}

void rt_hw_interrupt_init()
{
    /* Enable machine external interrupts. */
    // set_csr(sie, SIP_SEIP);
    int idx = 0;
    /* init exceptions table */
    for (idx = 0; idx < MAX_HANDLERS; idx++)
    {
        irq_desc[idx].handler = (rt_isr_handler_t)rt_hw_interrupt_handle;
        irq_desc[idx].param = RT_NULL;
#ifdef RT_USING_INTERRUPT_INFO
        rt_snprintf(irq_desc[idx].name, RT_NAME_MAX - 1, "default");
        irq_desc[idx].counter = 0;
#endif
    }

    plic_set_threshold(0);
}