1 /*
2  * linux/include/asm-i386/edd.h
3  *  Copyright (C) 2002, 2003 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/boot/setup.S populates a scratch table
13  * in the empty_zero_block that contains a list of BIOS-enumerated
14  * boot devices.
15  * In arch/i386/kernel/setup.c, this information is
16  * transferred into the edd structure, and in arch/i386/kernel/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 _ASM_I386_EDD_H
31 #define _ASM_I386_EDD_H
32 
33 #define EDDNR 0x1e9		/* addr of number of edd_info structs at EDDBUF
34 				   in empty_zero_block - treat this as 1 byte  */
35 #define EDDBUF	0x600		/* addr of edd_info structs in empty_zero_block */
36 #define EDDMAXNR 6		/* number of edd_info structs starting at EDDBUF  */
37 #define EDDEXTSIZE 4		/* change these if you muck with the structures */
38 #define EDDPARMSIZE 74
39 #define CHECKEXTENSIONSPRESENT 0x41
40 #define GETDEVICEPARAMETERS 0x48
41 #define EDDMAGIC1 0x55AA
42 #define EDDMAGIC2 0xAA55
43 
44 #define READ_SECTORS 0x02
45 #define MBR_SIG_OFFSET 0x1B8
46 #define DISK80_SIG_BUFFER 0x2cc
47 
48 #ifndef __ASSEMBLY__
49 
50 #define EDD_EXT_FIXED_DISK_ACCESS           (1 << 0)
51 #define EDD_EXT_DEVICE_LOCKING_AND_EJECTING (1 << 1)
52 #define EDD_EXT_ENHANCED_DISK_DRIVE_SUPPORT (1 << 2)
53 #define EDD_EXT_64BIT_EXTENSIONS            (1 << 3)
54 
55 #define EDD_INFO_DMA_BOUNDRY_ERROR_TRANSPARENT (1 << 0)
56 #define EDD_INFO_GEOMETRY_VALID                (1 << 1)
57 #define EDD_INFO_REMOVABLE                     (1 << 2)
58 #define EDD_INFO_WRITE_VERIFY                  (1 << 3)
59 #define EDD_INFO_MEDIA_CHANGE_NOTIFICATION     (1 << 4)
60 #define EDD_INFO_LOCKABLE                      (1 << 5)
61 #define EDD_INFO_NO_MEDIA_PRESENT              (1 << 6)
62 #define EDD_INFO_USE_INT13_FN50                (1 << 7)
63 
64 struct edd_device_params {
65 	u16 length;
66 	u16 info_flags;
67 	u32 num_default_cylinders;
68 	u32 num_default_heads;
69 	u32 sectors_per_track;
70 	u64 number_of_sectors;
71 	u16 bytes_per_sector;
72 	u32 dpte_ptr;		/* 0xFFFFFFFF for our purposes */
73 	u16 key;		/* = 0xBEDD */
74 	u8 device_path_info_length;	/* = 44 */
75 	u8 reserved2;
76 	u16 reserved3;
77 	u8 host_bus_type[4];
78 	u8 interface_type[8];
79 	union {
80 		struct {
81 			u16 base_address;
82 			u16 reserved1;
83 			u32 reserved2;
84 		} __attribute__ ((packed)) isa;
85 		struct {
86 			u8 bus;
87 			u8 slot;
88 			u8 function;
89 			u8 channel;
90 			u32 reserved;
91 		} __attribute__ ((packed)) pci;
92 		/* pcix is same as pci */
93 		struct {
94 			u64 reserved;
95 		} __attribute__ ((packed)) ibnd;
96 		struct {
97 			u64 reserved;
98 		} __attribute__ ((packed)) xprs;
99 		struct {
100 			u64 reserved;
101 		} __attribute__ ((packed)) htpt;
102 		struct {
103 			u64 reserved;
104 		} __attribute__ ((packed)) unknown;
105 	} interface_path;
106 	union {
107 		struct {
108 			u8 device;
109 			u8 reserved1;
110 			u16 reserved2;
111 			u32 reserved3;
112 			u64 reserved4;
113 		} __attribute__ ((packed)) ata;
114 		struct {
115 			u8 device;
116 			u8 lun;
117 			u8 reserved1;
118 			u8 reserved2;
119 			u32 reserved3;
120 			u64 reserved4;
121 		} __attribute__ ((packed)) atapi;
122 		struct {
123 			u16 id;
124 			u64 lun;
125 			u16 reserved1;
126 			u32 reserved2;
127 		} __attribute__ ((packed)) scsi;
128 		struct {
129 			u64 serial_number;
130 			u64 reserved;
131 		} __attribute__ ((packed)) usb;
132 		struct {
133 			u64 eui;
134 			u64 reserved;
135 		} __attribute__ ((packed)) i1394;
136 		struct {
137 			u64 wwid;
138 			u64 lun;
139 		} __attribute__ ((packed)) fibre;
140 		struct {
141 			u64 identity_tag;
142 			u64 reserved;
143 		} __attribute__ ((packed)) i2o;
144 		struct {
145 			u32 array_number;
146 			u32 reserved1;
147 			u64 reserved2;
148 		} __attribute((packed)) raid;
149 		struct {
150 			u8 device;
151 			u8 reserved1;
152 			u16 reserved2;
153 			u32 reserved3;
154 			u64 reserved4;
155 		} __attribute__ ((packed)) sata;
156 		struct {
157 			u64 reserved1;
158 			u64 reserved2;
159 		} __attribute__ ((packed)) unknown;
160 	} device_path;
161 	u8 reserved4;
162 	u8 checksum;
163 } __attribute__ ((packed));
164 
165 struct edd_info {
166 	u8 device;
167 	u8 version;
168 	u16 interface_support;
169 	struct edd_device_params params;
170 } __attribute__ ((packed));
171 
172 extern struct edd_info edd[EDDMAXNR];
173 extern unsigned char eddnr;
174 extern unsigned int edd_disk80_sig;
175 #endif				/*!__ASSEMBLY__ */
176 
177 #endif				/* _ASM_I386_EDD_H */
178