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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#define EDD_CL_ON 0x6e6f /* "on" for on */
56
57#ifndef __ASSEMBLY__
58
59#define EDD_EXT_FIXED_DISK_ACCESS (1 << 0)
60#define EDD_EXT_DEVICE_LOCKING_AND_EJECTING (1 << 1)
61#define EDD_EXT_ENHANCED_DISK_DRIVE_SUPPORT (1 << 2)
62#define EDD_EXT_64BIT_EXTENSIONS (1 << 3)
63
64#define EDD_INFO_DMA_BOUNDARY_ERROR_TRANSPARENT (1 << 0)
65#define EDD_INFO_GEOMETRY_VALID (1 << 1)
66#define EDD_INFO_REMOVABLE (1 << 2)
67#define EDD_INFO_WRITE_VERIFY (1 << 3)
68#define EDD_INFO_MEDIA_CHANGE_NOTIFICATION (1 << 4)
69#define EDD_INFO_LOCKABLE (1 << 5)
70#define EDD_INFO_NO_MEDIA_PRESENT (1 << 6)
71#define EDD_INFO_USE_INT13_FN50 (1 << 7)
72
73struct edd_device_params {
74 u16 length;
75 u16 info_flags;
76 u32 num_default_cylinders;
77 u32 num_default_heads;
78 u32 sectors_per_track;
79 u64 number_of_sectors;
80 u16 bytes_per_sector;
81 u32 dpte_ptr; /* 0xFFFFFFFF for our purposes */
82 u16 key; /* = 0xBEDD */
83 u8 device_path_info_length; /* = 44 */
84 u8 reserved2;
85 u16 reserved3;
86 u8 host_bus_type[4];
87 u8 interface_type[8];
88 union {
89 struct {
90 u16 base_address;
91 u16 reserved1;
92 u32 reserved2;
93 } __attribute__ ((packed)) isa;
94 struct {
95 u8 bus;
96 u8 slot;
97 u8 function;
98 u8 channel;
99 u32 reserved;
100 } __attribute__ ((packed)) pci;
101 /* pcix is same as pci */
102 struct {
103 u64 reserved;
104 } __attribute__ ((packed)) ibnd;
105 struct {
106 u64 reserved;
107 } __attribute__ ((packed)) xprs;
108 struct {
109 u64 reserved;
110 } __attribute__ ((packed)) htpt;
111 struct {
112 u64 reserved;
113 } __attribute__ ((packed)) unknown;
114 } interface_path;
115 union {
116 struct {
117 u8 device;
118 u8 reserved1;
119 u16 reserved2;
120 u32 reserved3;
121 u64 reserved4;
122 } __attribute__ ((packed)) ata;
123 struct {
124 u8 device;
125 u8 lun;
126 u8 reserved1;
127 u8 reserved2;
128 u32 reserved3;
129 u64 reserved4;
130 } __attribute__ ((packed)) atapi;
131 struct {
132 u16 id;
133 u64 lun;
134 u16 reserved1;
135 u32 reserved2;
136 } __attribute__ ((packed)) scsi;
137 struct {
138 u64 serial_number;
139 u64 reserved;
140 } __attribute__ ((packed)) usb;
141 struct {
142 u64 eui;
143 u64 reserved;
144 } __attribute__ ((packed)) i1394;
145 struct {
146 u64 wwid;
147 u64 lun;
148 } __attribute__ ((packed)) fibre;
149 struct {
150 u64 identity_tag;
151 u64 reserved;
152 } __attribute__ ((packed)) i2o;
153 struct {
154 u32 array_number;
155 u32 reserved1;
156 u64 reserved2;
157 } __attribute__ ((packed)) raid;
158 struct {
159 u8 device;
160 u8 reserved1;
161 u16 reserved2;
162 u32 reserved3;
163 u64 reserved4;
164 } __attribute__ ((packed)) sata;
165 struct {
166 u64 reserved1;
167 u64 reserved2;
168 } __attribute__ ((packed)) unknown;
169 } device_path;
170 u8 reserved4;
171 u8 checksum;
172} __attribute__ ((packed));
173
174struct edd_info {
175 u8 device;
176 u8 version;
177 u16 interface_support;
178 u16 legacy_max_cylinder;
179 u8 legacy_max_head;
180 u8 legacy_sectors_per_track;
181 struct edd_device_params params;
182} __attribute__ ((packed));
183
184struct edd {
185 unsigned int mbr_signature[EDD_MBR_SIG_MAX];
186 struct edd_info edd_info[EDDMAXNR];
187 unsigned char mbr_signature_nr;
188 unsigned char edd_info_nr;
189};
190
191extern struct edd edd;
192
193#endif /*!__ASSEMBLY__ */
194
195#endif /* _LINUX_EDD_H */