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edd.h
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1 /*
2  * linux/include/linux/edd.h
3  * Copyright (C) 2002, 2003, 2004 Dell Inc.
4  * by Matt Domsch <[email protected]>
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 _UAPI_LINUX_EDD_H
31 #define _UAPI_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 #endif
191 #endif /* _UAPI_LINUX_EDD_H */
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