[prefix] Allow prefix to specify a PCI autoboot device location

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Modified-by: Michael Brown <mcb30@ipxe.org>
Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/arch/i386/core/pci_autoboot.c

@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2014 Red Hat Inc.
+ *	Alex Williamson <alex.williamson@redhat.com>
+ *
+ * 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 <stdint.h>
+#include <ipxe/device.h>
+#include <ipxe/init.h>
+#include <realmode.h>
+#include <usr/autoboot.h>
+
+uint16_t __bss16 ( autoboot_busdevfn );
+#define autoboot_busdevfn __use_data16 ( autoboot_busdevfn )
+
+/**
+ * Initialise PCI autoboot device
+ */
+static void pci_autoboot_init ( void ) {
+
+	autoboot_device.bus_type = BUS_TYPE_PCI;
+	autoboot_device.location = autoboot_busdevfn;
+}
+
+/** PCI autoboot device initialisation function */
+struct init_fn pci_autoboot_init_fn __init_fn ( INIT_NORMAL ) = {
+	.initialise = pci_autoboot_init,
+};