ID_AA64DFR0_TRACE_VER_SHIFT
#define ID_AA64DFR0_TRACE_VER_MASK (0xf << ID_AA64DFR0_TRACE_VER_SHIFT)
#define ID_AA64DFR0_TRACE_VER_NONE (0x0 << ID_AA64DFR0_TRACE_VER_SHIFT)
#define ID_AA64DFR0_TRACE_VER_IMPL (0x1 << ID_AA64DFR0_TRACE_VER_SHIFT)