109 lines
2.2 KiB
C
109 lines
2.2 KiB
C
/*
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* File : trap.c
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* This file is part of RT-Thread RTOS
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* COPYRIGHT (C) 2006, RT-Thread Development Team
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://openlab.rt-thread.com/license/LICENSE
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*
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* Change Logs:
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* Date Author Notes
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*/
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#include <rtthread.h>
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#include <rthw.h>
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#include <bsp.h>
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/* Interrupt descriptor table. (Must be built at run time because
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* shifted function addresses can't be represented in relocation records.)
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*/
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struct Gatedesc idt[256] = { {0}, };
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struct Pseudodesc idt_pd =
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{
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0, sizeof(idt) - 1, (unsigned long) idt,
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};
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/* exception and interrupt handler table */
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extern rt_isr_handler_t isr_table[];
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extern rt_isr_handler_t trap_func[];
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extern rt_isr_handler_t hdinterrupt_func[];
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/**
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* @addtogroup I386
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*/
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/*@{*/
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/**
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* this function initializes the interrupt descript table
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*
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*/
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void rt_hw_idt_init(void)
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{
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extern void Xdefault;
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int i, j, func;
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for(i=0; i<MAX_HANDLERS; i++)
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{
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isr_table[i] = rt_hw_interrupt_handle;
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}
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// install a default handler
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for (i = 0; i < sizeof(idt)/sizeof(idt[0]); i++)
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SETGATE(idt[i], 0, GD_KT, &Xdefault, 0);
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/*install trap handler*/
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for(i = 0; i < 16; i++)
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{
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func = (int)trap_func[i];
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SETGATE(idt[i], 0, GD_KT, func, 0);
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}
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func = (int)trap_func[3];
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SETGATE(idt[3], 0, GD_KT, func, 3);
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i = 0;
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/*install exteral interrupt handler*/
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for(j = IRQ_OFFSET; j < IRQ_OFFSET + MAX_HANDLERS; j++)
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{
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func = (int)hdinterrupt_func[i];
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SETGATE(idt[j], 0, GD_KT, func, 0);
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i++;
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}
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// Load the IDT
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asm volatile("lidt idt_pd + 2");
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}
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/**
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* this function will deal with all kinds of kernel trap
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*
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*@param trapno the trap number
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*
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*/
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void rt_hw_trap_irq(int trapno)
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{
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switch(trapno)
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{
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case T_DIVIDE:
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rt_kprintf("Divide error interrupt\n");
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RT_ASSERT(0);
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case T_PGFLT:
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rt_kprintf("Page fault interrupt\n");
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RT_ASSERT(0);
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case T_GPFLT:
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rt_kprintf("General protection interrupt\n");
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RT_ASSERT(0);
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case T_DEFAULT:
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rt_hw_interrupt_handle(T_DEFAULT);
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return;
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}
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/*kernel bug if run here*/
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RT_ASSERT(0);
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}
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/*@}*/
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