linux/include/linux/edd.h
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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
  71struct 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
 172struct 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
 182struct 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__
 190extern struct edd edd;
 191#endif /* __KERNEL__ */
 192#endif                          /*!__ASSEMBLY__ */
 193
 194#endif                          /* _LINUX_EDD_H */
 195
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