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