feat(handoff): add func to check and init a tl
Add a function to check whether a transfer list has been initialized
at the input address. If not, initialize a transfer list at the
specified location with the given size. This is to help ensure that we
don't accidently overwrite a transfer list that's been passed from a
previous stage.
Change-Id: Ic5906626df09d3801435488e258490765e8f81eb
Signed-off-by: Harrison Mutai <harrison.mutai@arm.com>
diff --git a/lib/transfer_list/transfer_list.c b/lib/transfer_list/transfer_list.c
index 8d82d25..35dc418 100644
--- a/lib/transfer_list/transfer_list.c
+++ b/lib/transfer_list/transfer_list.c
@@ -521,3 +521,22 @@
}
return (uint8_t *)entry + entry->hdr_size;
}
+
+/*******************************************************************************
+ * Verifies that the transfer list has not already been initialized, then
+ * initializes it at the specified memory location.
+ *
+ * Return pointer to the transfer list or NULL on error
+ * *****************************************************************************/
+struct transfer_list_header *transfer_list_ensure(void *addr, size_t size)
+{
+ struct transfer_list_header *tl = NULL;
+
+ if (transfer_list_check_header(addr) == TL_OPS_ALL) {
+ return (struct transfer_list_header *)addr;
+ }
+
+ tl = transfer_list_init((void *)addr, size);
+
+ return tl;
+}