Linux更改IDT，如何读取偏移量？

#include <linux/kernel.h>
#include <linux/module.h>
#include <asm/ptrace.h>

void read_idt_offset(void)
{
    struct desc_ptr idtr;
    struct gate_struct *idt_table;
    unsigned long idt_address;
    unsigned long offset;

    // 获取IDT的地址
    asm("sidt %0":"=m"(idtr));

    // 获取IDT的起始地址
    idt_address = idtr.address & 0xffffffffff000000;
    idt_table = (struct gate_struct *)idt_address;

    // 读取中断门描述符的偏移量
    offset = idt_table[0].offset_low | ((unsigned long)idt_table[0].offset_middle << 16) | ((unsigned long)idt_table[0].offset_high << 32);

    printk(KERN_INFO "IDT offset: 0x%lx\n", offset);
}