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diff --git a/qemu/roms/ipxe/src/core/blockdev.c b/qemu/roms/ipxe/src/core/blockdev.c
new file mode 100644
index 000000000..9d118cb2f
--- /dev/null
+++ b/qemu/roms/ipxe/src/core/blockdev.c
@@ -0,0 +1,139 @@
+/*
+ * Copyright (C) 2010 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/interface.h>
+#include <ipxe/blockdev.h>
+
+/** @file
+ *
+ * Block devices
+ *
+ */
+
+/**
+ * Read from block device
+ *
+ * @v control		Control interface
+ * @v data		Data interface
+ * @v lba		Starting logical block address
+ * @v count		Number of logical blocks
+ * @v buffer		Data buffer
+ * @v len		Length of data buffer
+ * @ret rc		Return status code
+ */
+int block_read ( struct interface *control, struct interface *data,
+		 uint64_t lba, unsigned int count,
+		 userptr_t buffer, size_t len ) {
+	struct interface *dest;
+	block_read_TYPE ( void * ) *op =
+		intf_get_dest_op ( control, block_read, &dest );
+	void *object = intf_object ( dest );
+	int rc;
+
+	if ( op ) {
+		rc = op ( object, data, lba, count, buffer, len );
+	} else {
+		/* Default is to fail to issue the command */
+		rc = -EOPNOTSUPP;
+	}
+
+	intf_put ( dest );
+	return rc;
+}
+
+/**
+ * Write to block device
+ *
+ * @v control		Control interface
+ * @v data		Data interface
+ * @v lba		Starting logical block address
+ * @v count		Number of logical blocks
+ * @v buffer		Data buffer
+ * @v len		Length of data buffer
+ * @ret rc		Return status code
+ */
+int block_write ( struct interface *control, struct interface *data,
+		  uint64_t lba, unsigned int count,
+		  userptr_t buffer, size_t len ) {
+	struct interface *dest;
+	block_write_TYPE ( void * ) *op =
+		intf_get_dest_op ( control, block_write, &dest );
+	void *object = intf_object ( dest );
+	int rc;
+
+	if ( op ) {
+		rc = op ( object, data, lba, count, buffer, len );
+	} else {
+		/* Default is to fail to issue the command */
+		rc = -EOPNOTSUPP;
+	}
+
+	intf_put ( dest );
+	return rc;
+}
+
+/**
+ * Read block device capacity
+ *
+ * @v control		Control interface
+ * @v data		Data interface
+ * @ret rc		Return status code
+ */
+int block_read_capacity ( struct interface *control, struct interface *data ) {
+	struct interface *dest;
+	block_read_capacity_TYPE ( void * ) *op =
+		intf_get_dest_op ( control, block_read_capacity, &dest );
+	void *object = intf_object ( dest );
+	int rc;
+
+	if ( op ) {
+		rc = op ( object, data );
+	} else {
+		/* Default is to fail to issue the command */
+		rc = -EOPNOTSUPP;
+	}
+
+	intf_put ( dest );
+	return rc;
+}
+
+/**
+ * Report block device capacity
+ *
+ * @v intf		Interface
+ * @v capacity		Block device capacity
+ */
+void block_capacity ( struct interface *intf,
+		      struct block_device_capacity *capacity ) {
+	struct interface *dest;
+	block_capacity_TYPE ( void * ) *op =
+		intf_get_dest_op ( intf, block_capacity, &dest );
+	void *object = intf_object ( dest );
+
+	if ( op ) {
+		op ( object, capacity );
+	} else {
+		/* Default is to do nothing */
+	}
+
+	intf_put ( dest );
+}