Function rt_hw_idt_init

libcpu/ia32/trap.c:39–70

* this function initializes the interrupt descript table * */

 *
 */
void rt_hw_idt_init(void)
{
    extern void Xdefault(void);
    int i, j, func;

    // 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