/*
 * File      : trap.c
 * This file is part of RT-Thread RTOS
 * COPYRIGHT (C) 2006, RT-Thread Development Team
 *
 * The license and distribution terms for this file may be
 * found in the file LICENSE in this distribution or at
 * http://openlab.rt-thread.com/license/LICENSE
 *
 * Change Logs:
 * Date           Author       Notes
 * 2006-08-23     Bernard      first version
 */

#include <rtthread.h>
#include "lpc214x.h"

#define MAX_HANDLERS	32

extern rt_uint32_t rt_interrupt_nest;

rt_uint32_t rt_interrupt_from_thread, rt_interrupt_to_thread;
rt_uint32_t rt_thread_switch_interrput_flag;

/**
 * @addtogroup LPC214x
 */
/*@{*/

void rt_hw_interrupt_handler(int vector)
{
	rt_kprintf("Unhandled interrupt %d occured!!!\n", vector);
}

/**
 * This function will initialize hardware interrupt
 */
void rt_hw_interrupt_init()
{
	rt_base_t index;
	rt_uint32_t *vect_addr, *vect_ctl;
    
	/* initialize VIC*/
	VICIntEnClr = 0xffffffff;
	VICVectAddr = 0;
	/* set all to IRQ */
	VICIntSelect = 0;

	for (index = 0; index < MAX_HANDLERS; index ++)
	{
		vect_addr 	= (rt_uint32_t *)(VIC_BASE_ADDR + 0x100 + (index << 2));
		vect_ctl 	= (rt_uint32_t *)(VIC_BASE_ADDR + 0x200 + (index << 2));

		*vect_addr 	= (rt_uint32_t)rt_hw_interrupt_handler;
		*vect_ctl 	= 0xF;
	}

	/* init interrupt nest, and context in thread sp */
	rt_interrupt_nest = 0;
	rt_interrupt_from_thread = 0;
	rt_interrupt_to_thread = 0;
	rt_thread_switch_interrput_flag = 0;
}

/**
 * This function will mask a interrupt.
 * @param vector the interrupt number
 */
void rt_hw_interrupt_mask(int vector)
{
	VICIntEnClr = (1 << vector);
}

/**
 * This function will un-mask a interrupt.
 * @param vector the interrupt number
 */
void rt_hw_interrupt_umask(int vector)
{
	VICIntEnable = (1 << 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
 */
void rt_hw_interrupt_install(int vector, rt_isr_handler_t new_handler, rt_isr_handler_t *old_handler)
{
	if(vector >= 0 && vector < MAX_HANDLERS)
	{
		/* get VIC address */
		rt_uint32_t* vect_addr 	= (rt_uint32_t *)(VIC_BASE_ADDR + 0x100 + (vector << 2));
		rt_uint32_t* vect_ctl 	= (rt_uint32_t *)(VIC_BASE_ADDR + 0x200 + (vector << 2));

		/* assign IRQ slot and enable this slot */
		*vect_ctl = 0x20 | (vector & 0x1F);

		if (old_handler != RT_NULL) *old_handler = (rt_isr_handler_t) *vect_addr;
		if (new_handler != RT_NULL) *vect_addr = (rt_uint32_t) new_handler;
	}
}

/*@}*/