diff --git a/include/acpi/actbl2.h b/include/acpi/actbl2.h
index f1d5e89505277..68a607961b2fb 100644
--- a/include/acpi/actbl2.h
+++ b/include/acpi/actbl2.h
@@ -24,6 +24,7 @@
  * file. Useful because they make it more difficult to inadvertently type in
  * the wrong signature.
  */
+#define ACPI_SIG_BDAT           "BDAT"	/* BIOS Data ACPI Table */
 #define ACPI_SIG_IORT           "IORT"	/* IO Remapping Table */
 #define ACPI_SIG_IVRS           "IVRS"	/* I/O Virtualization Reporting Structure */
 #define ACPI_SIG_LPIT           "LPIT"	/* Low Power Idle Table */
@@ -65,6 +66,20 @@
  * See http://stackoverflow.com/a/1053662/41661
  */
 
+/*******************************************************************************
+ *
+ * BDAT - BIOS Data ACPI Table
+ *
+ * Conforms to "BIOS Data ACPI Table", Interface Specification v4.0 Draft 5
+ * Nov 2020
+ *
+ ******************************************************************************/
+
+struct acpi_table_bdat {
+	struct acpi_table_header header;
+	struct acpi_generic_address gas;
+};
+
 /*******************************************************************************
  *
  * IORT - IO Remapping Table