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