include/uapi/linux/edd.h

   1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
   2 /*
   3  * linux/include/linux/edd.h
   4  *  Copyright (C) 2002, 2003, 2004 Dell Inc.
   5  *  by Matt Domsch <Matt_Domsch@dell.com>
   6  *
   7  * structures and definitions for the int 13h, ax={41,48}h
   8  * BIOS Enhanced Disk Drive Services
   9  * This is based on the T13 group document D1572 Revision 0 (August 14 2002)
  10  * available at http://www.t13.org/docs2002/d1572r0.pdf.  It is
  11  * very similar to D1484 Revision 3 http://www.t13.org/docs2002/d1484r3.pdf
  12  *
  13  * In a nutshell, arch/{i386,x86_64}/boot/setup.S populates a scratch
  14  * table in the boot_params that contains a list of BIOS-enumerated
  15  * boot devices.
  16  * In arch/{i386,x86_64}/kernel/setup.c, this information is
  17  * transferred into the edd structure, and in drivers/firmware/edd.c, that
  18  * information is used to identify BIOS boot disk.  The code in setup.S
  19  * is very sensitive to the size of these structures.
  20  *
  21  * This program is free software; you can redistribute it and/or modify
  22  * it under the terms of the GNU General Public License v2.0 as published by
  23  * the Free Software Foundation
  24  *
  25  * This program is distributed in the hope that it will be useful,
  26  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  27  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  28  * GNU General Public License for more details.
  29  *
  30  */
  31 #ifndef _UAPI_LINUX_EDD_H
  32 #define _UAPI_LINUX_EDD_H
  33
  34 #include <linux/types.h>
  35
  36 #define EDDNR 0x1e9             /* addr of number of edd_info structs at EDDBUF
  37                                    in boot_params - treat this as 1 byte  */
  38 #define EDDBUF  0xd00           /* addr of edd_info structs in boot_params */
  39 #define EDDMAXNR 6              /* number of edd_info structs starting at EDDBUF  */
  40 #define EDDEXTSIZE 8            /* change these if you muck with the structures */
  41 #define EDDPARMSIZE 74
  42 #define CHECKEXTENSIONSPRESENT 0x41
  43 #define GETDEVICEPARAMETERS 0x48
  44 #define LEGACYGETDEVICEPARAMETERS 0x08
  45 #define EDDMAGIC1 0x55AA
  46 #define EDDMAGIC2 0xAA55
  47
  48
  49 #define READ_SECTORS 0x02         /* int13 AH=0x02 is READ_SECTORS command */
  50 #define EDD_MBR_SIG_OFFSET 0x1B8  /* offset of signature in the MBR */
  51 #define EDD_MBR_SIG_BUF    0x290  /* addr in boot params */
  52 #define EDD_MBR_SIG_MAX 16        /* max number of signatures to store */
  53 #define EDD_MBR_SIG_NR_BUF 0x1ea  /* addr of number of MBR signtaures at EDD_MBR_SIG_BUF
  54                                      in boot_params - treat this as 1 byte  */
  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 #endif                          /*!__ASSEMBLY__ */
 191
 192 #endif /* _UAPI_LINUX_EDD_H */