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 #include <linux/types.h> 34 35 #define EDDNR 0x1e9 /* addr of number of edd_info structs at EDDBUF 36 in boot_params - treat this as 1 byte */ 37 #define EDDBUF 0xd00 /* addr of edd_info structs in boot_params */ 38 #define EDDMAXNR 6 /* number of edd_info structs starting at EDDBUF */ 39 #define EDDEXTSIZE 8 /* change these if you muck with the structures */ 40 #define EDDPARMSIZE 74 41 #define CHECKEXTENSIONSPRESENT 0x41 42 #define GETDEVICEPARAMETERS 0x48 43 #define LEGACYGETDEVICEPARAMETERS 0x08 44 #define EDDMAGIC1 0x55AA 45 #define EDDMAGIC2 0xAA55 46 47 48 #define READ_SECTORS 0x02 /* int13 AH=0x02 is READ_SECTORS command */ 49 #define EDD_MBR_SIG_OFFSET 0x1B8 /* offset of signature in the MBR */ 50 #define EDD_MBR_SIG_BUF 0x290 /* addr in boot params */ 51 #define EDD_MBR_SIG_MAX 16 /* max number of signatures to store */ 52 #define EDD_MBR_SIG_NR_BUF 0x1ea /* addr of number of MBR signtaures at EDD_MBR_SIG_BUF 53 in boot_params - treat this as 1 byte */ 54 55 #ifndef __ASSEMBLY__ 56 57 #define EDD_EXT_FIXED_DISK_ACCESS (1 << 0) 58 #define EDD_EXT_DEVICE_LOCKING_AND_EJECTING (1 << 1) 59 #define EDD_EXT_ENHANCED_DISK_DRIVE_SUPPORT (1 << 2) 60 #define EDD_EXT_64BIT_EXTENSIONS (1 << 3) 61 62 #define EDD_INFO_DMA_BOUNDARY_ERROR_TRANSPARENT (1 << 0) 63 #define EDD_INFO_GEOMETRY_VALID (1 << 1) 64 #define EDD_INFO_REMOVABLE (1 << 2) 65 #define EDD_INFO_WRITE_VERIFY (1 << 3) 66 #define EDD_INFO_MEDIA_CHANGE_NOTIFICATION (1 << 4) 67 #define EDD_INFO_LOCKABLE (1 << 5) 68 #define EDD_INFO_NO_MEDIA_PRESENT (1 << 6) 69 #define EDD_INFO_USE_INT13_FN50 (1 << 7) 70 71 struct edd_device_params { 72 __u16 length; 73 __u16 info_flags; 74 __u32 num_default_cylinders; 75 __u32 num_default_heads; 76 __u32 sectors_per_track; 77 __u64 number_of_sectors; 78 __u16 bytes_per_sector; 79 __u32 dpte_ptr; /* 0xFFFFFFFF for our purposes */ 80 __u16 key; /* = 0xBEDD */ 81 __u8 device_path_info_length; /* = 44 */ 82 __u8 reserved2; 83 __u16 reserved3; 84 __u8 host_bus_type[4]; 85 __u8 interface_type[8]; 86 union { 87 struct { 88 __u16 base_address; 89 __u16 reserved1; 90 __u32 reserved2; 91 } __attribute__ ((packed)) isa; 92 struct { 93 __u8 bus; 94 __u8 slot; 95 __u8 function; 96 __u8 channel; 97 __u32 reserved; 98 } __attribute__ ((packed)) pci; 99 /* pcix is same as pci */ 100 struct { 101 __u64 reserved; 102 } __attribute__ ((packed)) ibnd; 103 struct { 104 __u64 reserved; 105 } __attribute__ ((packed)) xprs; 106 struct { 107 __u64 reserved; 108 } __attribute__ ((packed)) htpt; 109 struct { 110 __u64 reserved; 111 } __attribute__ ((packed)) unknown; 112 } interface_path; 113 union { 114 struct { 115 __u8 device; 116 __u8 reserved1; 117 __u16 reserved2; 118 __u32 reserved3; 119 __u64 reserved4; 120 } __attribute__ ((packed)) ata; 121 struct { 122 __u8 device; 123 __u8 lun; 124 __u8 reserved1; 125 __u8 reserved2; 126 __u32 reserved3; 127 __u64 reserved4; 128 } __attribute__ ((packed)) atapi; 129 struct { 130 __u16 id; 131 __u64 lun; 132 __u16 reserved1; 133 __u32 reserved2; 134 } __attribute__ ((packed)) scsi; 135 struct { 136 __u64 serial_number; 137 __u64 reserved; 138 } __attribute__ ((packed)) usb; 139 struct { 140 __u64 eui; 141 __u64 reserved; 142 } __attribute__ ((packed)) i1394; 143 struct { 144 __u64 wwid; 145 __u64 lun; 146 } __attribute__ ((packed)) fibre; 147 struct { 148 __u64 identity_tag; 149 __u64 reserved; 150 } __attribute__ ((packed)) i2o; 151 struct { 152 __u32 array_number; 153 __u32 reserved1; 154 __u64 reserved2; 155 } __attribute__ ((packed)) raid; 156 struct { 157 __u8 device; 158 __u8 reserved1; 159 __u16 reserved2; 160 __u32 reserved3; 161 __u64 reserved4; 162 } __attribute__ ((packed)) sata; 163 struct { 164 __u64 reserved1; 165 __u64 reserved2; 166 } __attribute__ ((packed)) unknown; 167 } device_path; 168 __u8 reserved4; 169 __u8 checksum; 170 } __attribute__ ((packed)); 171 172 struct edd_info { 173 __u8 device; 174 __u8 version; 175 __u16 interface_support; 176 __u16 legacy_max_cylinder; 177 __u8 legacy_max_head; 178 __u8 legacy_sectors_per_track; 179 struct edd_device_params params; 180 } __attribute__ ((packed)); 181 182 struct edd { 183 unsigned int mbr_signature[EDD_MBR_SIG_MAX]; 184 struct edd_info edd_info[EDDMAXNR]; 185 unsigned char mbr_signature_nr; 186 unsigned char edd_info_nr; 187 }; 188 189 #ifdef __KERNEL__ 190 extern struct edd edd; 191 #endif /* __KERNEL__ */ 192 #endif /*!__ASSEMBLY__ */ 193 194 #endif /* _LINUX_EDD_H */ 195