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   1 /* SPDX-License-Identifier: GPL-2.0 */
   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 #ifndef _LINUX_EDD_H
  22 #define _LINUX_EDD_H
  23
  24 #include <linux/types.h>
  25
  26 #define EDDNR 0x1e9             /* addr of number of edd_info structs at EDDBUF
  27                                    in boot_params - treat this as 1 byte  */
  28 #define EDDBUF  0xd00           /* addr of edd_info structs in boot_params */
  29 #define EDDMAXNR 6              /* number of edd_info structs starting at EDDBUF  */
  30 #define EDDEXTSIZE 8            /* change these if you muck with the structures */
  31 #define EDDPARMSIZE 74
  32 #define CHECKEXTENSIONSPRESENT 0x41
  33 #define GETDEVICEPARAMETERS 0x48
  34 #define LEGACYGETDEVICEPARAMETERS 0x08
  35 #define EDDMAGIC1 0x55AA
  36 #define EDDMAGIC2 0xAA55
  37
  38
  39 #define READ_SECTORS 0x02         /* int13 AH=0x02 is READ_SECTORS command */
  40 #define EDD_MBR_SIG_OFFSET 0x1B8  /* offset of signature in the MBR */
  41 #define EDD_MBR_SIG_BUF    0x290  /* addr in boot params */
  42 #define EDD_MBR_SIG_MAX 16        /* max number of signatures to store */
  43 #define EDD_MBR_SIG_NR_BUF 0x1ea  /* addr of number of MBR signtaures at EDD_MBR_SIG_BUF
  44                                      in boot_params - treat this as 1 byte  */
  45
  46 #ifndef __ASSEMBLY__
  47
  48 #define EDD_EXT_FIXED_DISK_ACCESS           (1 << 0)
  49 #define EDD_EXT_DEVICE_LOCKING_AND_EJECTING (1 << 1)
  50 #define EDD_EXT_ENHANCED_DISK_DRIVE_SUPPORT (1 << 2)
  51 #define EDD_EXT_64BIT_EXTENSIONS            (1 << 3)
  52
  53 #define EDD_INFO_DMA_BOUNDARY_ERROR_TRANSPARENT (1 << 0)
  54 #define EDD_INFO_GEOMETRY_VALID                (1 << 1)
  55 #define EDD_INFO_REMOVABLE                     (1 << 2)
  56 #define EDD_INFO_WRITE_VERIFY                  (1 << 3)
  57 #define EDD_INFO_MEDIA_CHANGE_NOTIFICATION     (1 << 4)
  58 #define EDD_INFO_LOCKABLE                      (1 << 5)
  59 #define EDD_INFO_NO_MEDIA_PRESENT              (1 << 6)
  60 #define EDD_INFO_USE_INT13_FN50                (1 << 7)
  61
  62 struct edd_device_params {
  63         __u16 length;
  64         __u16 info_flags;
  65         __u32 num_default_cylinders;
  66         __u32 num_default_heads;
  67         __u32 sectors_per_track;
  68         __u64 number_of_sectors;
  69         __u16 bytes_per_sector;
  70         __u32 dpte_ptr;         /* 0xFFFFFFFF for our purposes */
  71         __u16 key;              /* = 0xBEDD */
  72         __u8 device_path_info_length;   /* = 44 */
  73         __u8 reserved2;
  74         __u16 reserved3;
  75         __u8 host_bus_type[4];
  76         __u8 interface_type[8];
  77         union {
  78                 struct {
  79                         __u16 base_address;
  80                         __u16 reserved1;
  81                         __u32 reserved2;
  82                 } __attribute__ ((packed)) isa;
  83                 struct {
  84                         __u8 bus;
  85                         __u8 slot;
  86                         __u8 function;
  87                         __u8 channel;
  88                         __u32 reserved;
  89                 } __attribute__ ((packed)) pci;
  90                 /* pcix is same as pci */
  91                 struct {
  92                         __u64 reserved;
  93                 } __attribute__ ((packed)) ibnd;
  94                 struct {
  95                         __u64 reserved;
  96                 } __attribute__ ((packed)) xprs;
  97                 struct {
  98                         __u64 reserved;
  99                 } __attribute__ ((packed)) htpt;
 100                 struct {
 101                         __u64 reserved;
 102                 } __attribute__ ((packed)) unknown;
 103         } interface_path;
 104         union {
 105                 struct {
 106                         __u8 device;
 107                         __u8 reserved1;
 108                         __u16 reserved2;
 109                         __u32 reserved3;
 110                         __u64 reserved4;
 111                 } __attribute__ ((packed)) ata;
 112                 struct {
 113                         __u8 device;
 114                         __u8 lun;
 115                         __u8 reserved1;
 116                         __u8 reserved2;
 117                         __u32 reserved3;
 118                         __u64 reserved4;
 119                 } __attribute__ ((packed)) atapi;
 120                 struct {
 121                         __u16 id;
 122                         __u64 lun;
 123                         __u16 reserved1;
 124                         __u32 reserved2;
 125                 } __attribute__ ((packed)) scsi;
 126                 struct {
 127                         __u64 serial_number;
 128                         __u64 reserved;
 129                 } __attribute__ ((packed)) usb;
 130                 struct {
 131                         __u64 eui;
 132                         __u64 reserved;
 133                 } __attribute__ ((packed)) i1394;
 134                 struct {
 135                         __u64 wwid;
 136                         __u64 lun;
 137                 } __attribute__ ((packed)) fibre;
 138                 struct {
 139                         __u64 identity_tag;
 140                         __u64 reserved;
 141                 } __attribute__ ((packed)) i2o;
 142                 struct {
 143                         __u32 array_number;
 144                         __u32 reserved1;
 145                         __u64 reserved2;
 146                 } __attribute__ ((packed)) raid;
 147                 struct {
 148                         __u8 device;
 149                         __u8 reserved1;
 150                         __u16 reserved2;
 151                         __u32 reserved3;
 152                         __u64 reserved4;
 153                 } __attribute__ ((packed)) sata;
 154                 struct {
 155                         __u64 reserved1;
 156                         __u64 reserved2;
 157                 } __attribute__ ((packed)) unknown;
 158         } device_path;
 159         __u8 reserved4;
 160         __u8 checksum;
 161 } __attribute__ ((packed));
 162
 163 struct edd_info {
 164         __u8 device;
 165         __u8 version;
 166         __u16 interface_support;
 167         __u16 legacy_max_cylinder;
 168         __u8 legacy_max_head;
 169         __u8 legacy_sectors_per_track;
 170         struct edd_device_params params;
 171 } __attribute__ ((packed));
 172
 173 struct edd {
 174         unsigned int mbr_signature[EDD_MBR_SIG_MAX];
 175         struct edd_info edd_info[EDDMAXNR];
 176         unsigned char mbr_signature_nr;
 177         unsigned char edd_info_nr;
 178 };
 179
 180 #ifdef __KERNEL__
 181 extern struct edd edd;
 182 #endif /* __KERNEL__ */
 183 #endif                          /*!__ASSEMBLY__ */
 184
 185 #endif                          /* _LINUX_EDD_H */