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[linux-2.6.git] / include / linux / edd.h
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 #include <linux/types.h>
34
35 #define EDDNR 0x1e9             /* addr of number of edd_info structs at EDDBUF
36                                    in boot_params - treat this as 1 byte  */
37 #define EDDBUF  0xd00           /* addr of edd_info structs in boot_params */
38 #define EDDMAXNR 6              /* number of edd_info structs starting at EDDBUF  */
39 #define EDDEXTSIZE 8            /* change these if you muck with the structures */
40 #define EDDPARMSIZE 74
41 #define CHECKEXTENSIONSPRESENT 0x41
42 #define GETDEVICEPARAMETERS 0x48
43 #define LEGACYGETDEVICEPARAMETERS 0x08
44 #define EDDMAGIC1 0x55AA
45 #define EDDMAGIC2 0xAA55
46
47
48 #define READ_SECTORS 0x02         /* int13 AH=0x02 is READ_SECTORS command */
49 #define EDD_MBR_SIG_OFFSET 0x1B8  /* offset of signature in the MBR */
50 #define EDD_MBR_SIG_BUF    0x290  /* addr in boot params */
51 #define EDD_MBR_SIG_MAX 16        /* max number of signatures to store */
52 #define EDD_MBR_SIG_NR_BUF 0x1ea  /* addr of number of MBR signtaures at EDD_MBR_SIG_BUF
53                                      in boot_params - treat this as 1 byte  */
54
55 #ifndef __ASSEMBLY__
56
57 #define EDD_EXT_FIXED_DISK_ACCESS           (1 << 0)
58 #define EDD_EXT_DEVICE_LOCKING_AND_EJECTING (1 << 1)
59 #define EDD_EXT_ENHANCED_DISK_DRIVE_SUPPORT (1 << 2)
60 #define EDD_EXT_64BIT_EXTENSIONS            (1 << 3)
61
62 #define EDD_INFO_DMA_BOUNDARY_ERROR_TRANSPARENT (1 << 0)
63 #define EDD_INFO_GEOMETRY_VALID                (1 << 1)
64 #define EDD_INFO_REMOVABLE                     (1 << 2)
65 #define EDD_INFO_WRITE_VERIFY                  (1 << 3)
66 #define EDD_INFO_MEDIA_CHANGE_NOTIFICATION     (1 << 4)
67 #define EDD_INFO_LOCKABLE                      (1 << 5)
68 #define EDD_INFO_NO_MEDIA_PRESENT              (1 << 6)
69 #define EDD_INFO_USE_INT13_FN50                (1 << 7)
70
71 struct edd_device_params {
72         __u16 length;
73         __u16 info_flags;
74         __u32 num_default_cylinders;
75         __u32 num_default_heads;
76         __u32 sectors_per_track;
77         __u64 number_of_sectors;
78         __u16 bytes_per_sector;
79         __u32 dpte_ptr;         /* 0xFFFFFFFF for our purposes */
80         __u16 key;              /* = 0xBEDD */
81         __u8 device_path_info_length;   /* = 44 */
82         __u8 reserved2;
83         __u16 reserved3;
84         __u8 host_bus_type[4];
85         __u8 interface_type[8];
86         union {
87                 struct {
88                         __u16 base_address;
89                         __u16 reserved1;
90                         __u32 reserved2;
91                 } __attribute__ ((packed)) isa;
92                 struct {
93                         __u8 bus;
94                         __u8 slot;
95                         __u8 function;
96                         __u8 channel;
97                         __u32 reserved;
98                 } __attribute__ ((packed)) pci;
99                 /* pcix is same as pci */
100                 struct {
101                         __u64 reserved;
102                 } __attribute__ ((packed)) ibnd;
103                 struct {
104                         __u64 reserved;
105                 } __attribute__ ((packed)) xprs;
106                 struct {
107                         __u64 reserved;
108                 } __attribute__ ((packed)) htpt;
109                 struct {
110                         __u64 reserved;
111                 } __attribute__ ((packed)) unknown;
112         } interface_path;
113         union {
114                 struct {
115                         __u8 device;
116                         __u8 reserved1;
117                         __u16 reserved2;
118                         __u32 reserved3;
119                         __u64 reserved4;
120                 } __attribute__ ((packed)) ata;
121                 struct {
122                         __u8 device;
123                         __u8 lun;
124                         __u8 reserved1;
125                         __u8 reserved2;
126                         __u32 reserved3;
127                         __u64 reserved4;
128                 } __attribute__ ((packed)) atapi;
129                 struct {
130                         __u16 id;
131                         __u64 lun;
132                         __u16 reserved1;
133                         __u32 reserved2;
134                 } __attribute__ ((packed)) scsi;
135                 struct {
136                         __u64 serial_number;
137                         __u64 reserved;
138                 } __attribute__ ((packed)) usb;
139                 struct {
140                         __u64 eui;
141                         __u64 reserved;
142                 } __attribute__ ((packed)) i1394;
143                 struct {
144                         __u64 wwid;
145                         __u64 lun;
146                 } __attribute__ ((packed)) fibre;
147                 struct {
148                         __u64 identity_tag;
149                         __u64 reserved;
150                 } __attribute__ ((packed)) i2o;
151                 struct {
152                         __u32 array_number;
153                         __u32 reserved1;
154                         __u64 reserved2;
155                 } __attribute__ ((packed)) raid;
156                 struct {
157                         __u8 device;
158                         __u8 reserved1;
159                         __u16 reserved2;
160                         __u32 reserved3;
161                         __u64 reserved4;
162                 } __attribute__ ((packed)) sata;
163                 struct {
164                         __u64 reserved1;
165                         __u64 reserved2;
166                 } __attribute__ ((packed)) unknown;
167         } device_path;
168         __u8 reserved4;
169         __u8 checksum;
170 } __attribute__ ((packed));
171
172 struct edd_info {
173         __u8 device;
174         __u8 version;
175         __u16 interface_support;
176         __u16 legacy_max_cylinder;
177         __u8 legacy_max_head;
178         __u8 legacy_sectors_per_track;
179         struct edd_device_params params;
180 } __attribute__ ((packed));
181
182 struct edd {
183         unsigned int mbr_signature[EDD_MBR_SIG_MAX];
184         struct edd_info edd_info[EDDMAXNR];
185         unsigned char mbr_signature_nr;
186         unsigned char edd_info_nr;
187 };
188
189 #ifdef __KERNEL__
190 extern struct edd edd;
191 #endif /* __KERNEL__ */
192 #endif                          /*!__ASSEMBLY__ */
193
194 #endif                          /* _LINUX_EDD_H */