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 */ 193