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   1 /*
   2  * linux/include/linux/edd.h
   3  *  Copyright (C) 2002, 2003, 2004 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
  13  * table in the boot_params 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 boot_params - treat this as 1 byte  */
  35 #define EDDBUF  0xd00           /* addr of edd_info structs in boot_params */
  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
  46 #define READ_SECTORS 0x02         /* int13 AH=0x02 is READ_SECTORS command */
  47 #define EDD_MBR_SIG_OFFSET 0x1B8  /* offset of signature in the MBR */
  48 #define EDD_MBR_SIG_BUF    0x290  /* addr in boot params */
  49 #define EDD_MBR_SIG_MAX 16        /* max number of signatures to store */
  50 #define EDD_MBR_SIG_NR_BUF 0x1ea  /* addr of number of MBR signtaures at EDD_MBR_SIG_BUF
  51                                      in boot_params - treat this as 1 byte  */
  52 #define EDD_CL_EQUALS   0x3d646465     /* "edd=" */
  53 #define EDD_CL_OFF      0x666f         /* "of" for off  */
  54 #define EDD_CL_SKIP     0x6b73         /* "sk" for skipmbr */
  55
  56 #ifndef __ASSEMBLY__
  57
  58 #define EDD_EXT_FIXED_DISK_ACCESS           (1 << 0)
  59 #define EDD_EXT_DEVICE_LOCKING_AND_EJECTING (1 << 1)
  60 #define EDD_EXT_ENHANCED_DISK_DRIVE_SUPPORT (1 << 2)
  61 #define EDD_EXT_64BIT_EXTENSIONS            (1 << 3)
  62
  63 #define EDD_INFO_DMA_BOUNDARY_ERROR_TRANSPARENT (1 << 0)
  64 #define EDD_INFO_GEOMETRY_VALID                (1 << 1)
  65 #define EDD_INFO_REMOVABLE                     (1 << 2)
  66 #define EDD_INFO_WRITE_VERIFY                  (1 << 3)
  67 #define EDD_INFO_MEDIA_CHANGE_NOTIFICATION     (1 << 4)
  68 #define EDD_INFO_LOCKABLE                      (1 << 5)
  69 #define EDD_INFO_NO_MEDIA_PRESENT              (1 << 6)
  70 #define EDD_INFO_USE_INT13_FN50                (1 << 7)
  71
  72 struct edd_device_params {
  73         u16 length;
  74         u16 info_flags;
  75         u32 num_default_cylinders;
  76         u32 num_default_heads;
  77         u32 sectors_per_track;
  78         u64 number_of_sectors;
  79         u16 bytes_per_sector;
  80         u32 dpte_ptr;           /* 0xFFFFFFFF for our purposes */
  81         u16 key;                /* = 0xBEDD */
  82         u8 device_path_info_length;     /* = 44 */
  83         u8 reserved2;
  84         u16 reserved3;
  85         u8 host_bus_type[4];
  86         u8 interface_type[8];
  87         union {
  88                 struct {
  89                         u16 base_address;
  90                         u16 reserved1;
  91                         u32 reserved2;
  92                 } __attribute__ ((packed)) isa;
  93                 struct {
  94                         u8 bus;
  95                         u8 slot;
  96                         u8 function;
  97                         u8 channel;
  98                         u32 reserved;
  99                 } __attribute__ ((packed)) pci;
 100                 /* pcix is same as pci */
 101                 struct {
 102                         u64 reserved;
 103                 } __attribute__ ((packed)) ibnd;
 104                 struct {
 105                         u64 reserved;
 106                 } __attribute__ ((packed)) xprs;
 107                 struct {
 108                         u64 reserved;
 109                 } __attribute__ ((packed)) htpt;
 110                 struct {
 111                         u64 reserved;
 112                 } __attribute__ ((packed)) unknown;
 113         } interface_path;
 114         union {
 115                 struct {
 116                         u8 device;
 117                         u8 reserved1;
 118                         u16 reserved2;
 119                         u32 reserved3;
 120                         u64 reserved4;
 121                 } __attribute__ ((packed)) ata;
 122                 struct {
 123                         u8 device;
 124                         u8 lun;
 125                         u8 reserved1;
 126                         u8 reserved2;
 127                         u32 reserved3;
 128                         u64 reserved4;
 129                 } __attribute__ ((packed)) atapi;
 130                 struct {
 131                         u16 id;
 132                         u64 lun;
 133                         u16 reserved1;
 134                         u32 reserved2;
 135                 } __attribute__ ((packed)) scsi;
 136                 struct {
 137                         u64 serial_number;
 138                         u64 reserved;
 139                 } __attribute__ ((packed)) usb;
 140                 struct {
 141                         u64 eui;
 142                         u64 reserved;
 143                 } __attribute__ ((packed)) i1394;
 144                 struct {
 145                         u64 wwid;
 146                         u64 lun;
 147                 } __attribute__ ((packed)) fibre;
 148                 struct {
 149                         u64 identity_tag;
 150                         u64 reserved;
 151                 } __attribute__ ((packed)) i2o;
 152                 struct {
 153                         u32 array_number;
 154                         u32 reserved1;
 155                         u64 reserved2;
 156                 } __attribute__ ((packed)) raid;
 157                 struct {
 158                         u8 device;
 159                         u8 reserved1;
 160                         u16 reserved2;
 161                         u32 reserved3;
 162                         u64 reserved4;
 163                 } __attribute__ ((packed)) sata;
 164                 struct {
 165                         u64 reserved1;
 166                         u64 reserved2;
 167                 } __attribute__ ((packed)) unknown;
 168         } device_path;
 169         u8 reserved4;
 170         u8 checksum;
 171 } __attribute__ ((packed));
 172
 173 struct edd_info {
 174         u8 device;
 175         u8 version;
 176         u16 interface_support;
 177         u16 legacy_max_cylinder;
 178         u8 legacy_max_head;
 179         u8 legacy_sectors_per_track;
 180         struct edd_device_params params;
 181 } __attribute__ ((packed));
 182
 183 struct edd {
 184         unsigned int mbr_signature[EDD_MBR_SIG_MAX];
 185         struct edd_info edd_info[EDDMAXNR];
 186         unsigned char mbr_signature_nr;
 187         unsigned char edd_info_nr;
 188 };
 189
 190 extern struct edd edd;
 191
 192 #endif                          /*!__ASSEMBLY__ */
 193
 194 #endif                          /* _LINUX_EDD_H */