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