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/*
* File : interrupt.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
*/
#include <rtthread.h>
#include <rthw.h>
#include <bsp.h>
extern rt_uint32_t rt_interrupt_nest;
extern void rt_hw_idt_init(void);
rt_uint32_t rt_interrupt_from_thread, rt_interrupt_to_thread;
rt_uint32_t rt_thread_switch_interrupt_flag;
/* exception and interrupt handler table */
rt_isr_handler_t isr_table[MAX_HANDLERS];
rt_uint16_t irq_mask_8259A = 0xFFFF;
/**
* @addtogroup I386
*/
/*@{*/
/**
* This function initializes 8259 interrupt controller
*/
void rt_hw_pic_init()
{
outb(IO_PIC1, 0x11);
outb(IO_PIC1+1, IRQ_OFFSET);
outb(IO_PIC1+1, 1<<IRQ_SLAVE);
outb(IO_PIC1+1, 0x3);
outb(IO_PIC1+1, 0xff);
outb(IO_PIC1, 0x68);
outb(IO_PIC1, 0x0a);
outb(IO_PIC2, 0x11);
outb(IO_PIC2+1, IRQ_OFFSET + 8);
outb(IO_PIC2+1, IRQ_SLAVE);
outb(IO_PIC2+1, 0x3);
outb(IO_PIC2+1, 0xff);
outb(IO_PIC2, 0x68);
outb(IO_PIC2, 0x0a);
if (irq_mask_8259A != 0xFFFF)
{
outb(IO_PIC1+1, (char)irq_mask_8259A);
outb(IO_PIC2+1, (char)(irq_mask_8259A >> 8));
}
/* init interrupt nest, and context */
rt_interrupt_nest = 0;
rt_interrupt_from_thread = 0;
rt_interrupt_to_thread = 0;
rt_thread_switch_interrupt_flag = 0;
}
void rt_hw_interrupt_handle(int vector)
{
rt_kprintf("Unhandled interrupt %d occured!!!\n", vector);
}
/**
* This function initializes interrupt descript table and 8259 interrupt controller
*
*/
void rt_hw_interrupt_init(void)
{
rt_hw_idt_init();
rt_hw_pic_init();
}
void rt_hw_interrupt_umask(int vector)
{
irq_mask_8259A = irq_mask_8259A&~(1<<vector);
outb(IO_PIC1+1, (char)irq_mask_8259A);
outb(IO_PIC2+1, (char)(irq_mask_8259A >> 8));
}
void rt_hw_interrupt_mask(int vector)
{
irq_mask_8259A = irq_mask_8259A | (1<<vector);
outb(IO_PIC1+1, (char)irq_mask_8259A);
outb(IO_PIC2+1, (char)(irq_mask_8259A >> 8));
}
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;
}
}
rt_base_t rt_hw_interrupt_disable(void)
{
rt_base_t level;
__asm__ __volatile__("pushfl ; popl %0 ; cli":"=g" (level): :"memory");
return level;
}
void rt_hw_interrupt_enable(rt_base_t level)
{
__asm__ __volatile__("pushl %0 ; popfl": :"g" (level):"memory", "cc");
}
/*@}*/
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