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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 #include <linux/types.h>
  34
  35 #define EDDNR 0x1e9             /* addr of number of edd_info structs at EDDBUF
  36                                    in boot_params - treat this as 1 byte  */
  37 #define EDDBUF  0xd00           /* addr of edd_info structs in boot_params */
  38 #define EDDMAXNR 6              /* number of edd_info structs starting at EDDBUF  */
  39 #define EDDEXTSIZE 8            /* change these if you muck with the structures */
  40 #define EDDPARMSIZE 74
  41 #define CHECKEXTENSIONSPRESENT 0x41
  42 #define GETDEVICEPARAMETERS 0x48
  43 #define LEGACYGETDEVICEPARAMETERS 0x08
  44 #define EDDMAGIC1 0x55AA
  45 #define EDDMAGIC2 0xAA55
  46
  47
  48 #define READ_SECTORS 0x02         /* int13 AH=0x02 is READ_SECTORS command */
  49 #define EDD_MBR_SIG_OFFSET 0x1B8  /* offset of signature in the MBR */
  50 #define EDD_MBR_SIG_BUF    0x290  /* addr in boot params */
  51 #define EDD_MBR_SIG_MAX 16        /* max number of signatures to store */
  52 #define EDD_MBR_SIG_NR_BUF 0x1ea  /* addr of number of MBR signtaures at EDD_MBR_SIG_BUF
  53                                      in boot_params - treat this as 1 byte  */
  54
  55 #ifndef __ASSEMBLY__
  56
  57 #define EDD_EXT_FIXED_DISK_ACCESS           (1 << 0)
  58 #define EDD_EXT_DEVICE_LOCKING_AND_EJECTING (1 << 1)
  59 #define EDD_EXT_ENHANCED_DISK_DRIVE_SUPPORT (1 << 2)
  60 #define EDD_EXT_64BIT_EXTENSIONS            (1 << 3)
  61
  62 #define EDD_INFO_DMA_BOUNDARY_ERROR_TRANSPARENT (1 << 0)
  63 #define EDD_INFO_GEOMETRY_VALID                (1 << 1)
  64 #define EDD_INFO_REMOVABLE                     (1 << 2)
  65 #define EDD_INFO_WRITE_VERIFY                  (1 << 3)
  66 #define EDD_INFO_MEDIA_CHANGE_NOTIFICATION     (1 << 4)
  67 #define EDD_INFO_LOCKABLE                      (1 << 5)
  68 #define EDD_INFO_NO_MEDIA_PRESENT              (1 << 6)
  69 #define EDD_INFO_USE_INT13_FN50                (1 << 7)
  70
  71 struct edd_device_params {
  72         __u16 length;
  73         __u16 info_flags;
  74         __u32 num_default_cylinders;
  75         __u32 num_default_heads;
  76         __u32 sectors_per_track;
  77         __u64 number_of_sectors;
  78         __u16 bytes_per_sector;
  79         __u32 dpte_ptr;         /* 0xFFFFFFFF for our purposes */
  80         __u16 key;              /* = 0xBEDD */
  81         __u8 device_path_info_length;   /* = 44 */
  82         __u8 reserved2;
  83         __u16 reserved3;
  84         __u8 host_bus_type[4];
  85         __u8 interface_type[8];
  86         union {
  87                 struct {
  88                         __u16 base_address;
  89                         __u16 reserved1;
  90                         __u32 reserved2;
  91                 } __attribute__ ((packed)) isa;
  92                 struct {
  93                         __u8 bus;
  94                         __u8 slot;
  95                         __u8 function;
  96                         __u8 channel;
  97                         __u32 reserved;
  98                 } __attribute__ ((packed)) pci;
  99                 /* pcix is same as pci */
 100                 struct {
 101                         __u64 reserved;
 102                 } __attribute__ ((packed)) ibnd;
 103                 struct {
 104                         __u64 reserved;
 105                 } __attribute__ ((packed)) xprs;
 106                 struct {
 107                         __u64 reserved;
 108                 } __attribute__ ((packed)) htpt;
 109                 struct {
 110                         __u64 reserved;
 111                 } __attribute__ ((packed)) unknown;
 112         } interface_path;
 113         union {
 114                 struct {
 115                         __u8 device;
 116                         __u8 reserved1;
 117                         __u16 reserved2;
 118                         __u32 reserved3;
 119                         __u64 reserved4;
 120                 } __attribute__ ((packed)) ata;
 121                 struct {
 122                         __u8 device;
 123                         __u8 lun;
 124                         __u8 reserved1;
 125                         __u8 reserved2;
 126                         __u32 reserved3;
 127                         __u64 reserved4;
 128                 } __attribute__ ((packed)) atapi;
 129                 struct {
 130                         __u16 id;
 131                         __u64 lun;
 132                         __u16 reserved1;
 133                         __u32 reserved2;
 134                 } __attribute__ ((packed)) scsi;
 135                 struct {
 136                         __u64 serial_number;
 137                         __u64 reserved;
 138                 } __attribute__ ((packed)) usb;
 139                 struct {
 140                         __u64 eui;
 141                         __u64 reserved;
 142                 } __attribute__ ((packed)) i1394;
 143                 struct {
 144                         __u64 wwid;
 145                         __u64 lun;
 146                 } __attribute__ ((packed)) fibre;
 147                 struct {
 148                         __u64 identity_tag;
 149                         __u64 reserved;
 150                 } __attribute__ ((packed)) i2o;
 151                 struct {
 152                         __u32 array_number;
 153                         __u32 reserved1;
 154                         __u64 reserved2;
 155                 } __attribute__ ((packed)) raid;
 156                 struct {
 157                         __u8 device;
 158                         __u8 reserved1;
 159                         __u16 reserved2;
 160                         __u32 reserved3;
 161                         __u64 reserved4;
 162                 } __attribute__ ((packed)) sata;
 163                 struct {
 164                         __u64 reserved1;
 165                         __u64 reserved2;
 166                 } __attribute__ ((packed)) unknown;
 167         } device_path;
 168         __u8 reserved4;
 169         __u8 checksum;
 170 } __attribute__ ((packed));
 171
 172 struct edd_info {
 173         __u8 device;
 174         __u8 version;
 175         __u16 interface_support;
 176         __u16 legacy_max_cylinder;
 177         __u8 legacy_max_head;
 178         __u8 legacy_sectors_per_track;
 179         struct edd_device_params params;
 180 } __attribute__ ((packed));
 181
 182 struct edd {
 183         unsigned int mbr_signature[EDD_MBR_SIG_MAX];
 184         struct edd_info edd_info[EDDMAXNR];
 185         unsigned char mbr_signature_nr;
 186         unsigned char edd_info_nr;
 187 };
 188
 189 #ifdef __KERNEL__
 190 extern struct edd edd;
 191 #endif /* __KERNEL__ */
 192 #endif                          /*!__ASSEMBLY__ */
 193
 194 #endif                          /* _LINUX_EDD_H */