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 | |