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    apic_init();
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    apic_init();
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    uint8_t apic = l_apic_id();
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    uint8_t apic = l_apic_id();
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    for (i = 0; i < ops->cpu_count(); i++) {
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    for (i = 0; i < ops->cpu_count(); i++) {
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        struct descriptor *gdt_new;
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        descriptor_t *gdt_new;
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        /*
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        /*
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         * Skip processors marked unusable.
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         * Skip processors marked unusable.
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         */
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         */
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        if (!ops->cpu_enabled(i))
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        if (!ops->cpu_enabled(i))
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        /* XXX Flag FRAME_LOW_4_GiB was removed temporarily,
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        /* XXX Flag FRAME_LOW_4_GiB was removed temporarily,
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         * it needs to be replaced by a generic fuctionality of
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         * it needs to be replaced by a generic fuctionality of
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         * the memory subsystem
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         * the memory subsystem
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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 = (descriptor_t *) malloc(GDT_ITEMS *
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            sizeof(struct descriptor), FRAME_ATOMIC);
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            sizeof(descriptor_t), FRAME_ATOMIC);
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        if (!gdt_new)
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        if (!gdt_new)
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            panic("Cannot allocate memory for GDT.");
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            panic("Cannot allocate memory for GDT.");
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        memcpy(gdt_new, gdt, GDT_ITEMS * sizeof(struct descriptor));
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        memcpy(gdt_new, gdt, GDT_ITEMS * sizeof(descriptor_t));
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        memsetb(&gdt_new[TSS_DES], sizeof(struct descriptor), 0);
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        memsetb(&gdt_new[TSS_DES], sizeof(descriptor_t), 0);
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        protected_ap_gdtr.limit = GDT_ITEMS * sizeof(struct descriptor);
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        protected_ap_gdtr.limit = GDT_ITEMS * sizeof(descriptor_t);
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        protected_ap_gdtr.base = KA2PA((uintptr_t) gdt_new);
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        protected_ap_gdtr.base = KA2PA((uintptr_t) gdt_new);
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        gdtr.base = (uintptr_t) gdt_new;
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        gdtr.base = (uintptr_t) gdt_new;
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        if (l_apic_send_init_ipi(ops->cpu_apic_id(i))) {
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        if (l_apic_send_init_ipi(ops->cpu_apic_id(i))) {
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            /*
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            /*