multiboot: Refactor duplicated functions to a separate file

The implementation of write_bootdata() and get_redirect_dir() was
copied verbatim in two different places, obviously a bad thing for
maintainability. This moves them to a new file multiboot.c as they
are only used for multiboot.

Change-Id: Id0279216e4dd019f8bf612a81d3835eff010e506

1 files changed, 30 insertions, 0 deletions

diff --git a/firmware/export/multiboot.h b/firmware/export/multiboot.h
new file mode 100644
index 0000000000..0132b8531f
--- /dev/null
+++ b/firmware/export/multiboot.h
@@ -0,0 +1,30 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ *
+ * Copyright (C) 2017, 2020 by William Wilgus
+ *
+ * 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 (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+#ifndef __MULTIBOOT_H__
+#define __MULTIBOOT_H__
+
+extern int write_bootdata(unsigned char* buf, int len, unsigned int boot_volume);
+#ifdef HAVE_MULTIBOOT
+extern int get_redirect_dir(char* buf, int buffer_size, int volume,
+                            const char* rootdir, const char* firmware);
+#endif
+
+#endif /* __MULTIBOOT_H__ */