rt-thread/libcpu/ia32/trap.c

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2013-01-08 21:05:02 +08:00
/*
* 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
*/
#include <rtthread.h>
#include <rthw.h>
#include <bsp.h>
/* Interrupt descriptor table. (Must be built at run time because
* shifted function addresses can't be represented in relocation records.)
*/
struct Gatedesc idt[256] = { {0}, };
struct Pseudodesc idt_pd =
{
0, sizeof(idt) - 1, (unsigned long) idt,
};
/* exception and interrupt handler table */
extern rt_isr_handler_t isr_table[];
extern rt_isr_handler_t trap_func[];
extern rt_isr_handler_t hdinterrupt_func[];
/**
* @addtogroup I386
*/
/*@{*/
/**
* this function initializes the interrupt descript table
*
*/
void rt_hw_idt_init(void)
{
extern void Xdefault;
int i, j, func;
for(i=0; i<MAX_HANDLERS; i++)
{
isr_table[i] = rt_hw_interrupt_handle;
}
// install a default handler
for (i = 0; i < sizeof(idt)/sizeof(idt[0]); i++)
SETGATE(idt[i], 0, GD_KT, &Xdefault, 0);
/*install trap handler*/
for(i = 0; i < 16; i++)
{
func = (int)trap_func[i];
SETGATE(idt[i], 0, GD_KT, func, 0);
}
func = (int)trap_func[3];
SETGATE(idt[3], 0, GD_KT, func, 3);
i = 0;
/*install exteral interrupt handler*/
for(j = IRQ_OFFSET; j < IRQ_OFFSET + MAX_HANDLERS; j++)
{
func = (int)hdinterrupt_func[i];
SETGATE(idt[j], 0, GD_KT, func, 0);
i++;
}
// Load the IDT
asm volatile("lidt idt_pd + 2");
}
/**
* this function will deal with all kinds of kernel trap
*
*@param trapno the trap number
*
*/
void rt_hw_trap_irq(int trapno)
{
switch(trapno)
{
case T_DIVIDE:
rt_kprintf("Divide error interrupt\n");
RT_ASSERT(0);
case T_PGFLT:
rt_kprintf("Page fault interrupt\n");
RT_ASSERT(0);
case T_GPFLT:
rt_kprintf("General protection interrupt\n");
RT_ASSERT(0);
case T_DEFAULT:
rt_hw_interrupt_handle(T_DEFAULT);
return;
}
/*kernel bug if run here*/
RT_ASSERT(0);
}
/*@}*/