1 /* SPDX-License-Identifier: GPL-2.0-only */ 1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /* 2 /*
3 * linux/include/linux/edd.h 3 * linux/include/linux/edd.h
4 * Copyright (C) 2002, 2003, 2004 Dell Inc. 4 * Copyright (C) 2002, 2003, 2004 Dell Inc.
5 * by Matt Domsch <Matt_Domsch@dell.com> 5 * by Matt Domsch <Matt_Domsch@dell.com>
6 * 6 *
7 * structures and definitions for the int 13h, 7 * structures and definitions for the int 13h, ax={41,48}h
8 * BIOS Enhanced Disk Drive Services 8 * BIOS Enhanced Disk Drive Services
9 * This is based on the T13 group document D15 9 * This is based on the T13 group document D1572 Revision 0 (August 14 2002)
10 * available at http://www.t13.org/docs2002/d1 10 * available at http://www.t13.org/docs2002/d1572r0.pdf. It is
11 * very similar to D1484 Revision 3 http://www 11 * very similar to D1484 Revision 3 http://www.t13.org/docs2002/d1484r3.pdf
12 * 12 *
13 * In a nutshell, arch/{i386,x86_64}/boot/setu 13 * In a nutshell, arch/{i386,x86_64}/boot/setup.S populates a scratch
14 * table in the boot_params that contains a li 14 * table in the boot_params that contains a list of BIOS-enumerated
15 * boot devices. 15 * boot devices.
16 * In arch/{i386,x86_64}/kernel/setup.c, this 16 * In arch/{i386,x86_64}/kernel/setup.c, this information is
17 * transferred into the edd structure, and in 17 * transferred into the edd structure, and in drivers/firmware/edd.c, that
18 * information is used to identify BIOS boot d 18 * information is used to identify BIOS boot disk. The code in setup.S
19 * is very sensitive to the size of these stru 19 * is very sensitive to the size of these structures.
20 */ 20 */
21 #ifndef _LINUX_EDD_H 21 #ifndef _LINUX_EDD_H
22 #define _LINUX_EDD_H 22 #define _LINUX_EDD_H
23 23
24 #include <uapi/linux/edd.h> 24 #include <uapi/linux/edd.h>
25 25
26 #ifndef __ASSEMBLY__ 26 #ifndef __ASSEMBLY__
27 extern struct edd edd; 27 extern struct edd edd;
28 #endif /*!__ASSEMBLY_ 28 #endif /*!__ASSEMBLY__ */
29 #endif /* _LINUX_EDD_ 29 #endif /* _LINUX_EDD_H */
30 30
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