KERNEL_DATA_SELECTOR
tss->ss0 = KERNEL_DATA_SELECTOR;
tss->es = KERNEL_DATA_SELECTOR;
tss->ss = KERNEL_DATA_SELECTOR;
tss->ds = KERNEL_DATA_SELECTOR;
tss->fs = KERNEL_DATA_SELECTOR;
thread->arch_info.current_stack.ss = (uint32*)KERNEL_DATA_SELECTOR;