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 0xd00 /* 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 53 #ifndef __ASSEMBLY__ 54 55 #define EDD_EXT_FIXED_DISK_ACCESS (1 << 0) 56 #define EDD_EXT_DEVICE_LOCKING_AND_EJECTING (1 << 1) 57 #define EDD_EXT_ENHANCED_DISK_DRIVE_SUPPORT (1 << 2) 58 #define EDD_EXT_64BIT_EXTENSIONS (1 << 3) 59 60 #define EDD_INFO_DMA_BOUNDARY_ERROR_TRANSPARENT (1 << 0) 61 #define EDD_INFO_GEOMETRY_VALID (1 << 1) 62 #define EDD_INFO_REMOVABLE (1 << 2) 63 #define EDD_INFO_WRITE_VERIFY (1 << 3) 64 #define EDD_INFO_MEDIA_CHANGE_NOTIFICATION (1 << 4) 65 #define EDD_INFO_LOCKABLE (1 << 5) 66 #define EDD_INFO_NO_MEDIA_PRESENT (1 << 6) 67 #define EDD_INFO_USE_INT13_FN50 (1 << 7) 68 69 struct edd_device_params { 70 __u16 length; 71 __u16 info_flags; 72 __u32 num_default_cylinders; 73 __u32 num_default_heads; 74 __u32 sectors_per_track; 75 __u64 number_of_sectors; 76 __u16 bytes_per_sector; 77 __u32 dpte_ptr; /* 0xFFFFFFFF for our purposes */ 78 __u16 key; /* = 0xBEDD */ 79 __u8 device_path_info_length; /* = 44 */ 80 __u8 reserved2; 81 __u16 reserved3; 82 __u8 host_bus_type[4]; 83 __u8 interface_type[8]; 84 union { 85 struct { 86 __u16 base_address; 87 __u16 reserved1; 88 __u32 reserved2; 89 } __attribute__ ((packed)) isa; 90 struct { 91 __u8 bus; 92 __u8 slot; 93 __u8 function; 94 __u8 channel; 95 __u32 reserved; 96 } __attribute__ ((packed)) pci; 97 /* pcix is same as pci */ 98 struct { 99 __u64 reserved; 100 } __attribute__ ((packed)) ibnd; 101 struct { 102 __u64 reserved; 103 } __attribute__ ((packed)) xprs; 104 struct { 105 __u64 reserved; 106 } __attribute__ ((packed)) htpt; 107 struct { 108 __u64 reserved; 109 } __attribute__ ((packed)) unknown; 110 } interface_path; 111 union { 112 struct { 113 __u8 device; 114 __u8 reserved1; 115 __u16 reserved2; 116 __u32 reserved3; 117 __u64 reserved4; 118 } __attribute__ ((packed)) ata; 119 struct { 120 __u8 device; 121 __u8 lun; 122 __u8 reserved1; 123 __u8 reserved2; 124 __u32 reserved3; 125 __u64 reserved4; 126 } __attribute__ ((packed)) atapi; 127 struct { 128 __u16 id; 129 __u64 lun; 130 __u16 reserved1; 131 __u32 reserved2; 132 } __attribute__ ((packed)) scsi; 133 struct { 134 __u64 serial_number; 135 __u64 reserved; 136 } __attribute__ ((packed)) usb; 137 struct { 138 __u64 eui; 139 __u64 reserved; 140 } __attribute__ ((packed)) i1394; 141 struct { 142 __u64 wwid; 143 __u64 lun; 144 } __attribute__ ((packed)) fibre; 145 struct { 146 __u64 identity_tag; 147 __u64 reserved; 148 } __attribute__ ((packed)) i2o; 149 struct { 150 __u32 array_number; 151 __u32 reserved1; 152 __u64 reserved2; 153 } __attribute__ ((packed)) raid; 154 struct { 155 __u8 device; 156 __u8 reserved1; 157 __u16 reserved2; 158 __u32 reserved3; 159 __u64 reserved4; 160 } __attribute__ ((packed)) sata; 161 struct { 162 __u64 reserved1; 163 __u64 reserved2; 164 } __attribute__ ((packed)) unknown; 165 } device_path; 166 __u8 reserved4; 167 __u8 checksum; 168 } __attribute__ ((packed)); 169 170 struct edd_info { 171 __u8 device; 172 __u8 version; 173 __u16 interface_support; 174 __u16 legacy_max_cylinder; 175 __u8 legacy_max_head; 176 __u8 legacy_sectors_per_track; 177 struct edd_device_params params; 178 } __attribute__ ((packed)); 179 180 struct edd { 181 unsigned int mbr_signature[EDD_MBR_SIG_MAX]; 182 struct edd_info edd_info[EDDMAXNR]; 183 unsigned char mbr_signature_nr; 184 unsigned char edd_info_nr; 185 }; 186 187 #endif /*!__ASSEMBLY__ */ 188 189 #endif /* _LINUX_EDD_H */ 190