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diff --git a/qemu/roms/ipxe/src/core/pending.c b/qemu/roms/ipxe/src/core/pending.c
new file mode 100644
index 000000000..7bb0c2e00
--- /dev/null
+++ b/qemu/roms/ipxe/src/core/pending.c
@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2012 Michael Brown <mbrown@fensystems.co.uk>.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+#include <errno.h>
+#include <ipxe/process.h>
+#include <ipxe/timer.h>
+#include <ipxe/pending.h>
+
+/** @file
+ *
+ * Pending operations
+ *
+ */
+
+/** Total count of pending operations */
+int pending_total;
+
+/**
+ * Mark an operation as pending
+ *
+ * @v pending		Pending operation
+ */
+void pending_get ( struct pending_operation *pending ) {
+
+	pending->count++;
+	pending_total++;
+	DBGC ( pending, "PENDING %p incremented to %d (total %d)\n",
+	       pending, pending->count, pending_total );
+}
+
+/**
+ * Mark an operation as no longer pending
+ *
+ * @v pending		Pending operation
+ */
+void pending_put ( struct pending_operation *pending ) {
+
+	if ( pending->count ) {
+		pending_total--;
+		pending->count--;
+		DBGC ( pending, "PENDING %p decremented to %d (total %d)\n",
+		       pending, pending->count, pending_total );
+	}
+}