include/linux/edd.h

   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 */