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 */
195