diff --git a/usr.sbin/bhyve/basl.h b/usr.sbin/bhyve/basl.h
--- a/usr.sbin/bhyve/basl.h
+++ b/usr.sbin/bhyve/basl.h
@@ -33,5 +33,6 @@
 int basl_init();
 int basl_table_append_bytes(struct basl_table *table, const void *bytes,
     uint32_t len);
+int basl_table_append_int(struct basl_table *table, uint64_t val, uint8_t size);
 int basl_table_create(struct basl_table **table, struct vmctx *ctx,
     const uint8_t name[QEMU_FWCFG_MAX_NAME], uint32_t alignment, uint32_t off);
diff --git a/usr.sbin/bhyve/basl.c b/usr.sbin/bhyve/basl.c
--- a/usr.sbin/bhyve/basl.c
+++ b/usr.sbin/bhyve/basl.c
@@ -168,6 +168,18 @@
 	return (0);
 }
 
+int
+basl_table_append_int(struct basl_table *const table, const uint64_t val,
+    const uint8_t size)
+{
+	if (size > sizeof(val)) {
+		return (EINVAL);
+	}
+
+	const uint64_t val_le = htole64(val);
+	return (basl_table_append_bytes(table, &val_le, size));
+}
+
 int
 basl_table_create(struct basl_table **const table, struct vmctx *ctx,
     const uint8_t name[QEMU_FWCFG_MAX_NAME], const uint32_t alignment,