/*
 * 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
 * 2006-09-06     XuXinming    first version
 * 2006-09-15     Bernard      add interrupt bank 0..3 for more effective 
 *                             in irq trap
 */

#include <rtthread.h>
#include "s3c44b0.h"

#define MAX_HANDLERS	26

extern rt_uint32_t rt_interrupt_nest;

/* exception and interrupt handler table */
rt_isr_handler_t isr_table[MAX_HANDLERS];
rt_uint32_t rt_interrupt_from_thread, rt_interrupt_to_thread;
rt_uint32_t rt_thread_switch_interrput_flag;

unsigned char interrupt_bank0[256];
unsigned char interrupt_bank1[256];
unsigned char interrupt_bank2[256];
unsigned char interrupt_bank3[256];

/**
 * @addtogroup S3C44B0
 */
/*@{*/

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

/**
 * This function will initialize hardware interrupt
 */
void rt_hw_interrupt_init()
{
	register int i;

	/* all interrupt disabled include global bit */
	INTMSK = 0x07ffffff;
	
	/* clear pending register */
   	I_ISPC = 0x03ffffff;
   	
	/* non-vector mode IRQ enable */
	INTCON = 0x5;
	
	/* all IRQ mode */
	INTMOD = 0x0;

	/* init exceptions table */
	for(i=0; i<MAX_HANDLERS; i++)
	{
		isr_table[i] = rt_hw_interrupt_handle;
	}

	for ( i = 0; i < 256; i++)
	{
		interrupt_bank0[i] = 0;
		interrupt_bank1[i] = 0;
		interrupt_bank2[i] = 0;
		interrupt_bank3[i] = 0;
	}

	/* setup interrupt bank table */
	interrupt_bank0[1]	= 0;
	interrupt_bank0[2]	= 1;
	interrupt_bank0[4]	= 2;
	interrupt_bank0[8]	= 3;
	interrupt_bank0[16]	= 4;
	interrupt_bank0[32]	= 5;
	interrupt_bank0[64]	= 6;
	interrupt_bank0[128]= 7;

	interrupt_bank1[1]	= 8;
	interrupt_bank1[2]	= 9;
	interrupt_bank1[4]	= 10;
	interrupt_bank1[8]	= 11;
	interrupt_bank1[16]	= 12;
	interrupt_bank1[32]	= 13;
	interrupt_bank1[64]	= 14;
	interrupt_bank1[128]= 15;

	interrupt_bank2[1]	= 16;
	interrupt_bank2[2]	= 17;
	interrupt_bank2[4]	= 18;
	interrupt_bank2[8]	= 19;
	interrupt_bank2[16]	= 20;
	interrupt_bank2[32]	= 21;
	interrupt_bank2[64]	= 22;
	interrupt_bank2[128]= 23;

	interrupt_bank3[1]	= 24;
	interrupt_bank3[2]	= 25;

	/* 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)
{
	INTMSK |= 1 << vector;
}

/**
 * This function will un-mask a interrupt.
 * @param vector the interrupt number
 */
void rt_hw_interrupt_umask(int vector)
{
	INTMSK &= ~(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 < MAX_HANDLERS)
	{
		if (old_handler != RT_NULL) *old_handler = isr_table[vector];
		if (new_handler != RT_NULL) isr_table[vector] = new_handler;
	}
}

/*@}*/