LXR linux/include/linux/edd.h

   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  0x600           /* 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
  72struct 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
 173struct 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
 183struct 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
 190extern struct edd edd;
 191
 192#endif                          /*!__ASSEMBLY__ */
 193
 194#endif                          /* _LINUX_EDD_H */
 195