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
@@ -82,6 +82,9 @@
 /* Add an ACPI_TABLE_* to basl without its header. */
 int basl_table_append_content(struct basl_table *table, void *data,
     uint32_t len);
+int basl_table_append_fwcfg(struct basl_table *table,
+    const uint8_t *fwcfg_name, uint32_t alignment,
+    uint8_t size);
 int basl_table_append_gas(struct basl_table *table, uint8_t space_id,
     uint8_t bit_width, uint8_t bit_offset, uint8_t access_width,
     uint64_t address);
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
@@ -490,6 +490,23 @@
 	    len - sizeof(ACPI_TABLE_HEADER)));
 }
 
+int
+basl_table_append_fwcfg(struct basl_table *const table,
+    const uint8_t *fwcfg_name, const uint32_t alignment, const uint8_t size)
+{
+	assert(table != NULL);
+	assert(fwcfg_name != NULL);
+	assert(size <= sizeof(uint64_t));
+
+	BASL_EXEC(qemu_loader_alloc(basl_loader, fwcfg_name, alignment,
+	    QEMU_LOADER_ALLOC_HIGH));
+	BASL_EXEC(qemu_loader_add_pointer(basl_loader, table->fwcfg_name,
+	    fwcfg_name, table->len, size));
+	BASL_EXEC(basl_table_append_int(table, 0, size));
+
+	return (0);
+}
+
 int
 basl_table_append_gas(struct basl_table *const table, const uint8_t space_id,
     const uint8_t bit_width, const uint8_t bit_offset,