diff --git a/paw/stos/head/arch/amd64/hpetreg.h b/paw/stos/head/arch/amd64/hpetreg.h
new file mode 100644
index 0000000..f57bcfc
--- /dev/null
+++ b/paw/stos/head/arch/amd64/hpetreg.h
@@ -0,0 +1,29 @@
+/*
+ * Copyright (c) 2026, Chloe M.
+ * Provided under the BSD-3 clause.
+ *
+ * Description: HPET registers
+ * Author:      Chloe M.
+ */
+
+#ifndef _MACHINE_HPETREG_H_
+#define _MACHINE_HPETREG_H_ 1
+
+#include <stdef.h>
+
+/* Register offsets */
+#define HPET_GENERAL_CAP    0x00
+#define HPET_GENERAL_CONF   0x10
+#define HPET_MAIN_COUNTER   0xF0
+
+/* General capabilities  */
+#define HPET_REV_ID_MASK     0xFF
+#define HPET_REV_ID_SHIFT    0
+#define HPET_PERIOD_MASK     0xFFFFFFFF
+#define HPET_PERIOD_SHIFT    32
+
+/* General conf fields */
+#define HPET_GCONF_EN BIT(0)
+#define HPET_LEG_RT   BIT(1)
+
+#endif  /* !_MACHINE_HPETREG_H_ */