/*
   * linux/include/linux/edd.h
   *  Copyright (C) 2002, 2003, 2004 Dell Inc.
   *  by Matt Domsch <Matt_Domsch@dell.com>
   *
   * structures and definitions for the int 13h, ax={41,48}h
   * BIOS Enhanced Disk Drive Services
   * This is based on the T13 group document D1572 Revision 0 (August 14 2002)
   * available at http://www.t13.org/docs2002/d1572r0.pdf.  It is
   * very similar to D1484 Revision 3 http://www.t13.org/docs2002/d1484r3.pdf
   *
   * In a nutshell, arch/{i386,x86_64}/boot/setup.S populates a scratch
   * table in the boot_params that contains a list of BIOS-enumerated
   * boot devices.
   * In arch/{i386,x86_64}/kernel/setup.c, this information is
   * transferred into the edd structure, and in drivers/firmware/edd.c, that
   * information is used to identify BIOS boot disk.  The code in setup.S
   * is very sensitive to the size of these structures.
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License v2.0 as published by
   * the Free Software Foundation
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   */
  #ifndef _LINUX_EDD_H
  #define _LINUX_EDD_H

  #include <linux/types.h>

  #define EDDNR 0x1e9		/* addr of number of edd_info structs at EDDBUF
  				   in boot_params - treat this as 1 byte  */

  #define EDDBUF	0xd00		/* addr of edd_info structs in boot_params */

  #define EDDMAXNR 6		/* number of edd_info structs starting at EDDBUF  */
  #define EDDEXTSIZE 8		/* change these if you muck with the structures */
  #define EDDPARMSIZE 74
  #define CHECKEXTENSIONSPRESENT 0x41
  #define GETDEVICEPARAMETERS 0x48
  #define LEGACYGETDEVICEPARAMETERS 0x08
  #define EDDMAGIC1 0x55AA
  #define EDDMAGIC2 0xAA55
  
  
  #define READ_SECTORS 0x02         /* int13 AH=0x02 is READ_SECTORS command */
  #define EDD_MBR_SIG_OFFSET 0x1B8  /* offset of signature in the MBR */
  #define EDD_MBR_SIG_BUF    0x290  /* addr in boot params */
  #define EDD_MBR_SIG_MAX 16        /* max number of signatures to store */
  #define EDD_MBR_SIG_NR_BUF 0x1ea  /* addr of number of MBR signtaures at EDD_MBR_SIG_BUF
  				     in boot_params - treat this as 1 byte  */

  
  #ifndef __ASSEMBLY__
  
  #define EDD_EXT_FIXED_DISK_ACCESS           (1 << 0)
  #define EDD_EXT_DEVICE_LOCKING_AND_EJECTING (1 << 1)
  #define EDD_EXT_ENHANCED_DISK_DRIVE_SUPPORT (1 << 2)
  #define EDD_EXT_64BIT_EXTENSIONS            (1 << 3)
  
  #define EDD_INFO_DMA_BOUNDARY_ERROR_TRANSPARENT (1 << 0)
  #define EDD_INFO_GEOMETRY_VALID                (1 << 1)
  #define EDD_INFO_REMOVABLE                     (1 << 2)
  #define EDD_INFO_WRITE_VERIFY                  (1 << 3)
  #define EDD_INFO_MEDIA_CHANGE_NOTIFICATION     (1 << 4)
  #define EDD_INFO_LOCKABLE                      (1 << 5)
  #define EDD_INFO_NO_MEDIA_PRESENT              (1 << 6)
  #define EDD_INFO_USE_INT13_FN50                (1 << 7)
  
  struct edd_device_params {

  	__u16 length;
  	__u16 info_flags;
  	__u32 num_default_cylinders;
  	__u32 num_default_heads;
  	__u32 sectors_per_track;
  	__u64 number_of_sectors;
  	__u16 bytes_per_sector;
  	__u32 dpte_ptr;		/* 0xFFFFFFFF for our purposes */
  	__u16 key;		/* = 0xBEDD */
  	__u8 device_path_info_length;	/* = 44 */
  	__u8 reserved2;
  	__u16 reserved3;
  	__u8 host_bus_type[4];
  	__u8 interface_type[8];

  	union {
  		struct {

  			__u16 base_address;
  			__u16 reserved1;
  			__u32 reserved2;

  		} __attribute__ ((packed)) isa;
  		struct {

  			__u8 bus;
  			__u8 slot;
  			__u8 function;
  			__u8 channel;
  			__u32 reserved;

  		} __attribute__ ((packed)) pci;
  		/* pcix is same as pci */
  		struct {

  			__u64 reserved;

  		} __attribute__ ((packed)) ibnd;
  		struct {

  			__u64 reserved;

  		} __attribute__ ((packed)) xprs;
  		struct {

  			__u64 reserved;

  		} __attribute__ ((packed)) htpt;
  		struct {

  			__u64 reserved;

  		} __attribute__ ((packed)) unknown;
  	} interface_path;
  	union {
  		struct {

  			__u8 device;
  			__u8 reserved1;
  			__u16 reserved2;
  			__u32 reserved3;
  			__u64 reserved4;

  		} __attribute__ ((packed)) ata;
  		struct {

  			__u8 device;
  			__u8 lun;
  			__u8 reserved1;
  			__u8 reserved2;
  			__u32 reserved3;
  			__u64 reserved4;

  		} __attribute__ ((packed)) atapi;
  		struct {

  			__u16 id;
  			__u64 lun;
  			__u16 reserved1;
  			__u32 reserved2;

  		} __attribute__ ((packed)) scsi;
  		struct {

  			__u64 serial_number;
  			__u64 reserved;

  		} __attribute__ ((packed)) usb;
  		struct {

  			__u64 eui;
  			__u64 reserved;

  		} __attribute__ ((packed)) i1394;
  		struct {

  			__u64 wwid;
  			__u64 lun;

  		} __attribute__ ((packed)) fibre;
  		struct {

  			__u64 identity_tag;
  			__u64 reserved;

  		} __attribute__ ((packed)) i2o;
  		struct {

  			__u32 array_number;
  			__u32 reserved1;
  			__u64 reserved2;

  		} __attribute__ ((packed)) raid;
  		struct {

  			__u8 device;
  			__u8 reserved1;
  			__u16 reserved2;
  			__u32 reserved3;
  			__u64 reserved4;

  		} __attribute__ ((packed)) sata;
  		struct {

  			__u64 reserved1;
  			__u64 reserved2;

  		} __attribute__ ((packed)) unknown;
  	} device_path;

  	__u8 reserved4;
  	__u8 checksum;

  } __attribute__ ((packed));
  
  struct edd_info {

  	__u8 device;
  	__u8 version;
  	__u16 interface_support;
  	__u16 legacy_max_cylinder;
  	__u8 legacy_max_head;
  	__u8 legacy_sectors_per_track;

  	struct edd_device_params params;
  } __attribute__ ((packed));
  
  struct edd {
  	unsigned int mbr_signature[EDD_MBR_SIG_MAX];
  	struct edd_info edd_info[EDDMAXNR];
  	unsigned char mbr_signature_nr;
  	unsigned char edd_info_nr;
  };

  #ifdef __KERNEL__

  extern struct edd edd;

  #endif /* __KERNEL__ */

  #endif				/*!__ASSEMBLY__ */
  
  #endif				/* _LINUX_EDD_H */