1 /* 2 * linux/include/linux/edd.h 3 * Copyright (C) 2002, 2003, 2004 Dell Inc. 4 * by Matt Domsch <[email protected]> 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 #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 #define EDD_CL_ON 0x6e6f /* "on" for on */ 56 57 #ifndef __ASSEMBLY__ 58 59 #define EDD_EXT_FIXED_DISK_ACCESS (1 << 0) 60 #define EDD_EXT_DEVICE_LOCKING_AND_EJECTING (1 << 1) 61 #define EDD_EXT_ENHANCED_DISK_DRIVE_SUPPORT (1 << 2) 62 #define EDD_EXT_64BIT_EXTENSIONS (1 << 3) 63 64 #define EDD_INFO_DMA_BOUNDARY_ERROR_TRANSPARENT (1 << 0) 65 #define EDD_INFO_GEOMETRY_VALID (1 << 1) 66 #define EDD_INFO_REMOVABLE (1 << 2) 67 #define EDD_INFO_WRITE_VERIFY (1 << 3) 68 #define EDD_INFO_MEDIA_CHANGE_NOTIFICATION (1 << 4) 69 #define EDD_INFO_LOCKABLE (1 << 5) 70 #define EDD_INFO_NO_MEDIA_PRESENT (1 << 6) 71 #define EDD_INFO_USE_INT13_FN50 (1 << 7) 72 73 struct edd_device_params { 74 u16 length; 75 u16 info_flags; 76 u32 num_default_cylinders; 77 u32 num_default_heads; 78 u32 sectors_per_track; 79 u64 number_of_sectors; 80 u16 bytes_per_sector; 81 u32 dpte_ptr; /* 0xFFFFFFFF for our purposes */ 82 u16 key; /* = 0xBEDD */ 83 u8 device_path_info_length; /* = 44 */ 84 u8 reserved2; 85 u16 reserved3; 86 u8 host_bus_type[4]; 87 u8 interface_type[8]; 88 union { 89 struct { 90 u16 base_address; 91 u16 reserved1; 92 u32 reserved2; 93 } __attribute__ ((packed)) isa; 94 struct { 95 u8 bus; 96 u8 slot; 97 u8 function; 98 u8 channel; 99 u32 reserved; 100 } __attribute__ ((packed)) pci; 101 /* pcix is same as pci */ 102 struct { 103 u64 reserved; 104 } __attribute__ ((packed)) ibnd; 105 struct { 106 u64 reserved; 107 } __attribute__ ((packed)) xprs; 108 struct { 109 u64 reserved; 110 } __attribute__ ((packed)) htpt; 111 struct { 112 u64 reserved; 113 } __attribute__ ((packed)) unknown; 114 } interface_path; 115 union { 116 struct { 117 u8 device; 118 u8 reserved1; 119 u16 reserved2; 120 u32 reserved3; 121 u64 reserved4; 122 } __attribute__ ((packed)) ata; 123 struct { 124 u8 device; 125 u8 lun; 126 u8 reserved1; 127 u8 reserved2; 128 u32 reserved3; 129 u64 reserved4; 130 } __attribute__ ((packed)) atapi; 131 struct { 132 u16 id; 133 u64 lun; 134 u16 reserved1; 135 u32 reserved2; 136 } __attribute__ ((packed)) scsi; 137 struct { 138 u64 serial_number; 139 u64 reserved; 140 } __attribute__ ((packed)) usb; 141 struct { 142 u64 eui; 143 u64 reserved; 144 } __attribute__ ((packed)) i1394; 145 struct { 146 u64 wwid; 147 u64 lun; 148 } __attribute__ ((packed)) fibre; 149 struct { 150 u64 identity_tag; 151 u64 reserved; 152 } __attribute__ ((packed)) i2o; 153 struct { 154 u32 array_number; 155 u32 reserved1; 156 u64 reserved2; 157 } __attribute__ ((packed)) raid; 158 struct { 159 u8 device; 160 u8 reserved1; 161 u16 reserved2; 162 u32 reserved3; 163 u64 reserved4; 164 } __attribute__ ((packed)) sata; 165 struct { 166 u64 reserved1; 167 u64 reserved2; 168 } __attribute__ ((packed)) unknown; 169 } device_path; 170 u8 reserved4; 171 u8 checksum; 172 } __attribute__ ((packed)); 173 174 struct edd_info { 175 u8 device; 176 u8 version; 177 u16 interface_support; 178 u16 legacy_max_cylinder; 179 u8 legacy_max_head; 180 u8 legacy_sectors_per_track; 181 struct edd_device_params params; 182 } __attribute__ ((packed)); 183 184 struct edd { 185 unsigned int mbr_signature[EDD_MBR_SIG_MAX]; 186 struct edd_info edd_info[EDDMAXNR]; 187 unsigned char mbr_signature_nr; 188 unsigned char edd_info_nr; 189 }; 190 191 extern struct edd edd; 192 193 #endif /*!__ASSEMBLY__ */ 194 195 #endif /* _LINUX_EDD_H */ 196