diff --git a/kaleid/include/kernel/cpu.h b/kaleid/include/kernel/cpu.h
index 3a26310..f347d99 100644
--- a/kaleid/include/kernel/cpu.h
+++ b/kaleid/include/kernel/cpu.h
@@ -21,3 +21,9 @@
 //  You should have received a copy of the GNU General Public License         //
 //  along with OS/K.  If not, see <https://www.gnu.org/licenses/>.            //
 //----------------------------------------------------------------------------//
+
+#define cpuid(in, a, b, c, d) asm("cpuid"                                      \
+                                  : "=a" (a), "=b" (b), "=c" (c), "=d" (d)     \
+                                  : "a" (in)                                   \
+                                 );
+
diff --git a/kaleid/kernel/cpu/cpuid.c b/kaleid/kernel/cpu/cpuid.c
index 1728396..7cab5a5 100644
--- a/kaleid/kernel/cpu/cpuid.c
+++ b/kaleid/kernel/cpu/cpuid.c
@@ -21,3 +21,5 @@
 //  You should have received a copy of the GNU General Public License         //
 //  along with OS/K.  If not, see <https://www.gnu.org/licenses/>.            //
 //----------------------------------------------------------------------------//
+
+