1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * linux/include/linux/edd.h
4  *  Copyright (C) 2002, 2003, 2004 Dell Inc.
5  *  by Matt Domsch <Matt_Domsch@dell.com>
6  *
7  * structures and definitions for the int 13h, ax={41,48}h
8  * BIOS Enhanced Disk Drive Services
9  * This is based on the T13 group document D1572 Revision 0 (August 14 2002)
10  * available at http://www.t13.org/docs2002/d1572r0.pdf.  It is
11  * very similar to D1484 Revision 3 http://www.t13.org/docs2002/d1484r3.pdf
12  *
13  * In a nutshell, arch/{i386,x86_64}/boot/setup.S populates a scratch
14  * table in the boot_params that contains a list of BIOS-enumerated
15  * boot devices.
16  * In arch/{i386,x86_64}/kernel/setup.c, this information is
17  * transferred into the edd structure, and in drivers/firmware/edd.c, that
18  * information is used to identify BIOS boot disk.  The code in setup.S
19  * is very sensitive to the size of these structures.
20  */
21 #ifndef _LINUX_EDD_H
22 #define _LINUX_EDD_H
23 
24 #include <uapi/linux/edd.h>
25 
26 #ifndef __ASSEMBLY__
27 extern struct edd edd;
28 #endif				/*!__ASSEMBLY__ */
29 #endif				/* _LINUX_EDD_H */
30