include/linux/edd.h

   1 /*
   2  * linux/include/linux/edd.h
   3  *  Copyright (C) 2002, 2003 Dell Inc.
   4  *  by Matt Domsch <Matt_Domsch@dell.com>
   5  *
   6  * structures and definitions for the int 13h, ax={41,48}h
   7  * BIOS Enhanced Disk Drive Services
   8  * This is based on the T13 group document D1572 Revision 0 (August 14 2002)
   9  * available at http://www.t13.org/docs2002/d1572r0.pdf.  It is
  10  * very similar to D1484 Revision 3 http://www.t13.org/docs2002/d1484r3.pdf
  11  *
  12  * In a nutshell, arch/{i386,x86_64}/boot/setup.S populates a scratch table
  13  * in the empty_zero_block that contains a list of BIOS-enumerated
  14  * boot devices.
  15  * In arch/{i386,x86_64}/kernel/setup.c, this information is
  16  * transferred into the edd structure, and in drivers/firmware/edd.c, that
  17  * information is used to identify BIOS boot disk.  The code in setup.S
  18  * is very sensitive to the size of these structures.
  19  *
  20  * This program is free software; you can redistribute it and/or modify
  21  * it under the terms of the GNU General Public License v2.0 as published by
  22  * the Free Software Foundation
  23  *
  24  * This program is distributed in the hope that it will be useful,
  25  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  26  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  27  * GNU General Public License for more details.
  28  *
  29  */
  30 #ifndef _LINUX_EDD_H
  31 #define _LINUX_EDD_H
  32
  33 #define EDDNR 0x1e9             /* addr of number of edd_info structs at EDDBUF
  34                                    in empty_zero_block - treat this as 1 byte  */
  35 #define EDDBUF  0x600           /* addr of edd_info structs in empty_zero_block */
  36 #define EDDMAXNR 6              /* number of edd_info structs starting at EDDBUF  */
  37 #define EDDEXTSIZE 8            /* change these if you muck with the structures */
  38 #define EDDPARMSIZE 74
  39 #define CHECKEXTENSIONSPRESENT 0x41
  40 #define GETDEVICEPARAMETERS 0x48
  41 #define LEGACYGETDEVICEPARAMETERS 0x08
  42 #define EDDMAGIC1 0x55AA
  43 #define EDDMAGIC2 0xAA55
  44
  45 #define READ_SECTORS 0x02
  46 #define MBR_SIG_OFFSET 0x1B8
  47 #define DISK80_SIG_BUFFER 0x2cc
  48 #ifndef __ASSEMBLY__
  49
  50 #define EDD_EXT_FIXED_DISK_ACCESS           (1 << 0)
  51 #define EDD_EXT_DEVICE_LOCKING_AND_EJECTING (1 << 1)
  52 #define EDD_EXT_ENHANCED_DISK_DRIVE_SUPPORT (1 << 2)
  53 #define EDD_EXT_64BIT_EXTENSIONS            (1 << 3)
  54
  55 #define EDD_INFO_DMA_BOUNDARY_ERROR_TRANSPARENT (1 << 0)
  56 #define EDD_INFO_GEOMETRY_VALID                (1 << 1)
  57 #define EDD_INFO_REMOVABLE                     (1 << 2)
  58 #define EDD_INFO_WRITE_VERIFY                  (1 << 3)
  59 #define EDD_INFO_MEDIA_CHANGE_NOTIFICATION     (1 << 4)
  60 #define EDD_INFO_LOCKABLE                      (1 << 5)
  61 #define EDD_INFO_NO_MEDIA_PRESENT              (1 << 6)
  62 #define EDD_INFO_USE_INT13_FN50                (1 << 7)
  63
  64 struct edd_device_params {
  65         u16 length;
  66         u16 info_flags;
  67         u32 num_default_cylinders;
  68         u32 num_default_heads;
  69         u32 sectors_per_track;
  70         u64 number_of_sectors;
  71         u16 bytes_per_sector;
  72         u32 dpte_ptr;           /* 0xFFFFFFFF for our purposes */
  73         u16 key;                /* = 0xBEDD */
  74         u8 device_path_info_length;     /* = 44 */
  75         u8 reserved2;
  76         u16 reserved3;
  77         u8 host_bus_type[4];
  78         u8 interface_type[8];
  79         union {
  80                 struct {
  81                         u16 base_address;
  82                         u16 reserved1;
  83                         u32 reserved2;
  84                 } __attribute__ ((packed)) isa;
  85                 struct {
  86                         u8 bus;
  87                         u8 slot;
  88                         u8 function;
  89                         u8 channel;
  90                         u32 reserved;
  91                 } __attribute__ ((packed)) pci;
  92                 /* pcix is same as pci */
  93                 struct {
  94                         u64 reserved;
  95                 } __attribute__ ((packed)) ibnd;
  96                 struct {
  97                         u64 reserved;
  98                 } __attribute__ ((packed)) xprs;
  99                 struct {
 100                         u64 reserved;
 101                 } __attribute__ ((packed)) htpt;
 102                 struct {
 103                         u64 reserved;
 104                 } __attribute__ ((packed)) unknown;
 105         } interface_path;
 106         union {
 107                 struct {
 108                         u8 device;
 109                         u8 reserved1;
 110                         u16 reserved2;
 111                         u32 reserved3;
 112                         u64 reserved4;
 113                 } __attribute__ ((packed)) ata;
 114                 struct {
 115                         u8 device;
 116                         u8 lun;
 117                         u8 reserved1;
 118                         u8 reserved2;
 119                         u32 reserved3;
 120                         u64 reserved4;
 121                 } __attribute__ ((packed)) atapi;
 122                 struct {
 123                         u16 id;
 124                         u64 lun;
 125                         u16 reserved1;
 126                         u32 reserved2;
 127                 } __attribute__ ((packed)) scsi;
 128                 struct {
 129                         u64 serial_number;
 130                         u64 reserved;
 131                 } __attribute__ ((packed)) usb;
 132                 struct {
 133                         u64 eui;
 134                         u64 reserved;
 135                 } __attribute__ ((packed)) i1394;
 136                 struct {
 137                         u64 wwid;
 138                         u64 lun;
 139                 } __attribute__ ((packed)) fibre;
 140                 struct {
 141                         u64 identity_tag;
 142                         u64 reserved;
 143                 } __attribute__ ((packed)) i2o;
 144                 struct {
 145                         u32 array_number;
 146                         u32 reserved1;
 147                         u64 reserved2;
 148                 } __attribute__ ((packed)) raid;
 149                 struct {
 150                         u8 device;
 151                         u8 reserved1;
 152                         u16 reserved2;
 153                         u32 reserved3;
 154                         u64 reserved4;
 155                 } __attribute__ ((packed)) sata;
 156                 struct {
 157                         u64 reserved1;
 158                         u64 reserved2;
 159                 } __attribute__ ((packed)) unknown;
 160         } device_path;
 161         u8 reserved4;
 162         u8 checksum;
 163 } __attribute__ ((packed));
 164
 165 struct edd_info {
 166         u8 device;
 167         u8 version;
 168         u16 interface_support;
 169         u16 legacy_max_cylinder;
 170         u8 legacy_max_head;
 171         u8 legacy_sectors_per_track;
 172         struct edd_device_params params;
 173 } __attribute__ ((packed));
 174
 175 extern struct edd_info edd[EDDMAXNR];
 176 extern unsigned char eddnr;
 177 extern unsigned int edd_disk80_sig;
 178
 179 #endif                          /*!__ASSEMBLY__ */
 180
 181 #endif                          /* _LINUX_EDD_H */