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 * SPDX-License-Identifier: GPL-2.0 21 */ 22 #ifndef _LINUX_EDD_H 23 #define _LINUX_EDD_H 24 25 #include <linux/types.h> 26 27 #define EDDNR 0x1e9 /* addr of number of edd_info structs at EDDBUF 28 in boot_params - treat this as 1 byte */ 29 #define EDDBUF 0xd00 /* addr of edd_info structs in boot_params */ 30 #define EDDMAXNR 6 /* number of edd_info structs starting at EDDBUF */ 31 #define EDDEXTSIZE 8 /* change these if you muck with the structures */ 32 #define EDDPARMSIZE 74 33 #define CHECKEXTENSIONSPRESENT 0x41 34 #define GETDEVICEPARAMETERS 0x48 35 #define LEGACYGETDEVICEPARAMETERS 0x08 36 #define EDDMAGIC1 0x55AA 37 #define EDDMAGIC2 0xAA55 38 39 40 #define READ_SECTORS 0x02 /* int13 AH=0x02 is READ_SECTORS command */ 41 #define EDD_MBR_SIG_OFFSET 0x1B8 /* offset of signature in the MBR */ 42 #define EDD_MBR_SIG_BUF 0x290 /* addr in boot params */ 43 #define EDD_MBR_SIG_MAX 16 /* max number of signatures to store */ 44 #define EDD_MBR_SIG_NR_BUF 0x1ea /* addr of number of MBR signtaures at EDD_MBR_SIG_BUF 45 in boot_params - treat this as 1 byte */ 46 47 #ifndef __ASSEMBLY__ 48 49 #define EDD_EXT_FIXED_DISK_ACCESS (1 << 0) 50 #define EDD_EXT_DEVICE_LOCKING_AND_EJECTING (1 << 1) 51 #define EDD_EXT_ENHANCED_DISK_DRIVE_SUPPORT (1 << 2) 52 #define EDD_EXT_64BIT_EXTENSIONS (1 << 3) 53 54 #define EDD_INFO_DMA_BOUNDARY_ERROR_TRANSPARENT (1 << 0) 55 #define EDD_INFO_GEOMETRY_VALID (1 << 1) 56 #define EDD_INFO_REMOVABLE (1 << 2) 57 #define EDD_INFO_WRITE_VERIFY (1 << 3) 58 #define EDD_INFO_MEDIA_CHANGE_NOTIFICATION (1 << 4) 59 #define EDD_INFO_LOCKABLE (1 << 5) 60 #define EDD_INFO_NO_MEDIA_PRESENT (1 << 6) 61 #define EDD_INFO_USE_INT13_FN50 (1 << 7) 62 63 struct edd_device_params { 64 __u16 length; 65 __u16 info_flags; 66 __u32 num_default_cylinders; 67 __u32 num_default_heads; 68 __u32 sectors_per_track; 69 __u64 number_of_sectors; 70 __u16 bytes_per_sector; 71 __u32 dpte_ptr; /* 0xFFFFFFFF for our purposes */ 72 __u16 key; /* = 0xBEDD */ 73 __u8 device_path_info_length; /* = 44 */ 74 __u8 reserved2; 75 __u16 reserved3; 76 __u8 host_bus_type[4]; 77 __u8 interface_type[8]; 78 union { 79 struct { 80 __u16 base_address; 81 __u16 reserved1; 82 __u32 reserved2; 83 } __attribute__ ((packed)) isa; 84 struct { 85 __u8 bus; 86 __u8 slot; 87 __u8 function; 88 __u8 channel; 89 __u32 reserved; 90 } __attribute__ ((packed)) pci; 91 /* pcix is same as pci */ 92 struct { 93 __u64 reserved; 94 } __attribute__ ((packed)) ibnd; 95 struct { 96 __u64 reserved; 97 } __attribute__ ((packed)) xprs; 98 struct { 99 __u64 reserved; 100 } __attribute__ ((packed)) htpt; 101 struct { 102 __u64 reserved; 103 } __attribute__ ((packed)) unknown; 104 } interface_path; 105 union { 106 struct { 107 __u8 device; 108 __u8 reserved1; 109 __u16 reserved2; 110 __u32 reserved3; 111 __u64 reserved4; 112 } __attribute__ ((packed)) ata; 113 struct { 114 __u8 device; 115 __u8 lun; 116 __u8 reserved1; 117 __u8 reserved2; 118 __u32 reserved3; 119 __u64 reserved4; 120 } __attribute__ ((packed)) atapi; 121 struct { 122 __u16 id; 123 __u64 lun; 124 __u16 reserved1; 125 __u32 reserved2; 126 } __attribute__ ((packed)) scsi; 127 struct { 128 __u64 serial_number; 129 __u64 reserved; 130 } __attribute__ ((packed)) usb; 131 struct { 132 __u64 eui; 133 __u64 reserved; 134 } __attribute__ ((packed)) i1394; 135 struct { 136 __u64 wwid; 137 __u64 lun; 138 } __attribute__ ((packed)) fibre; 139 struct { 140 __u64 identity_tag; 141 __u64 reserved; 142 } __attribute__ ((packed)) i2o; 143 struct { 144 __u32 array_number; 145 __u32 reserved1; 146 __u64 reserved2; 147 } __attribute__ ((packed)) raid; 148 struct { 149 __u8 device; 150 __u8 reserved1; 151 __u16 reserved2; 152 __u32 reserved3; 153 __u64 reserved4; 154 } __attribute__ ((packed)) sata; 155 struct { 156 __u64 reserved1; 157 __u64 reserved2; 158 } __attribute__ ((packed)) unknown; 159 } device_path; 160 __u8 reserved4; 161 __u8 checksum; 162 } __attribute__ ((packed)); 163 164 struct edd_info { 165 __u8 device; 166 __u8 version; 167 __u16 interface_support; 168 __u16 legacy_max_cylinder; 169 __u8 legacy_max_head; 170 __u8 legacy_sectors_per_track; 171 struct edd_device_params params; 172 } __attribute__ ((packed)); 173 174 struct edd { 175 unsigned int mbr_signature[EDD_MBR_SIG_MAX]; 176 struct edd_info edd_info[EDDMAXNR]; 177 unsigned char mbr_signature_nr; 178 unsigned char edd_info_nr; 179 }; 180 181 #ifdef __KERNEL__ 182 extern struct edd edd; 183 #endif /* __KERNEL__ */ 184 #endif /*!__ASSEMBLY__ */ 185 186 #endif /* _LINUX_EDD_H */ 187