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        /*
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        /*
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         * Prepare new GDT for CPU in question.
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         * Prepare new GDT for CPU in question.
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         */
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         */
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        gdt_new = (struct descriptor *) malloc(GDT_ITEMS *
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        gdt_new = (struct descriptor *) malloc(GDT_ITEMS *
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            sizeof(struct descriptor), FRAME_ATOMIC);
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            sizeof(struct descriptor), FRAME_ATOMIC | FRAME_LOW_4_GiB);
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        if (!gdt_new)
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        if (!gdt_new)
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            panic("couldn't allocate memory for GDT\n");
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            panic("couldn't allocate memory for GDT\n");
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        memcpy(gdt_new, gdt, GDT_ITEMS * sizeof(struct descriptor));
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        memcpy(gdt_new, gdt, GDT_ITEMS * sizeof(struct descriptor));
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        memsetb(&gdt_new[TSS_DES], sizeof(struct descriptor), 0);
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        memsetb(&gdt_new[TSS_DES], sizeof(struct descriptor), 0);