[PATCH] Increase number of e820 entries hard limit from 32 to 128
[linux-3.10.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 #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
72 struct 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
173 struct 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
183 struct 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
190 extern struct edd edd;
191
192 #endif                          /*!__ASSEMBLY__ */
193
194 #endif                          /* _LINUX_EDD_H */