LUCODE32_SEL
ldt_segp = (struct mem_segment_descriptor *)(ldtstore + LUCODE32_SEL);
tf->tf_cs = LSEL(LUCODE32_SEL, SEL_UPL);
#define LSYSRETBASE_SEL LUCODE32_SEL
((s) == GSEL(GUCODE32_SEL, SEL_UPL) || (s) == LSEL(LUCODE32_SEL, SEL_UPL))