asm volatile ("movw %%ax, %%gs" :: "a" (USER_DS));

    asm volatile ("movw %%ax, %%fs" :: "a" (USER_DS));

    asm volatile ("movw %%ax, %%es" :: "a" (KERNEL_DS));

    asm volatile ("movw %%ax, %%ds" :: "a" (KERNEL_DS));

    asm volatile ("movw %%ax, %%ss" :: "a" (KERNEL_DS));

asm volatile ("ljmp %0, $1f\n 1:\n" :: "i" (KERNEL_CS));

USER_DS 和KERNEL_DS是常量
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FROM 203.126.220.*