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
53#ifndef __ASSEMBLY__
54
55#define EDD_EXT_FIXED_DISK_ACCESS           (1 << 0)
56#define EDD_EXT_DEVICE_LOCKING_AND_EJECTING (1 << 1)
57#define EDD_EXT_ENHANCED_DISK_DRIVE_SUPPORT (1 << 2)
58#define EDD_EXT_64BIT_EXTENSIONS            (1 << 3)
59
60#define EDD_INFO_DMA_BOUNDARY_ERROR_TRANSPARENT (1 << 0)
61#define EDD_INFO_GEOMETRY_VALID                (1 << 1)
62#define EDD_INFO_REMOVABLE                     (1 << 2)
63#define EDD_INFO_WRITE_VERIFY                  (1 << 3)
64#define EDD_INFO_MEDIA_CHANGE_NOTIFICATION     (1 << 4)
65#define EDD_INFO_LOCKABLE                      (1 << 5)
66#define EDD_INFO_NO_MEDIA_PRESENT              (1 << 6)
67#define EDD_INFO_USE_INT13_FN50                (1 << 7)
68
69struct edd_device_params {
70	__u16 length;
71	__u16 info_flags;
72	__u32 num_default_cylinders;
73	__u32 num_default_heads;
74	__u32 sectors_per_track;
75	__u64 number_of_sectors;
76	__u16 bytes_per_sector;
77	__u32 dpte_ptr;		/* 0xFFFFFFFF for our purposes */
78	__u16 key;		/* = 0xBEDD */
79	__u8 device_path_info_length;	/* = 44 */
80	__u8 reserved2;
81	__u16 reserved3;
82	__u8 host_bus_type[4];
83	__u8 interface_type[8];
84	union {
85		struct {
86			__u16 base_address;
87			__u16 reserved1;
88			__u32 reserved2;
89		} __attribute__ ((packed)) isa;
90		struct {
91			__u8 bus;
92			__u8 slot;
93			__u8 function;
94			__u8 channel;
95			__u32 reserved;
96		} __attribute__ ((packed)) pci;
97		/* pcix is same as pci */
98		struct {
99			__u64 reserved;
100		} __attribute__ ((packed)) ibnd;
101		struct {
102			__u64 reserved;
103		} __attribute__ ((packed)) xprs;
104		struct {
105			__u64 reserved;
106		} __attribute__ ((packed)) htpt;
107		struct {
108			__u64 reserved;
109		} __attribute__ ((packed)) unknown;
110	} interface_path;
111	union {
112		struct {
113			__u8 device;
114			__u8 reserved1;
115			__u16 reserved2;
116			__u32 reserved3;
117			__u64 reserved4;
118		} __attribute__ ((packed)) ata;
119		struct {
120			__u8 device;
121			__u8 lun;
122			__u8 reserved1;
123			__u8 reserved2;
124			__u32 reserved3;
125			__u64 reserved4;
126		} __attribute__ ((packed)) atapi;
127		struct {
128			__u16 id;
129			__u64 lun;
130			__u16 reserved1;
131			__u32 reserved2;
132		} __attribute__ ((packed)) scsi;
133		struct {
134			__u64 serial_number;
135			__u64 reserved;
136		} __attribute__ ((packed)) usb;
137		struct {
138			__u64 eui;
139			__u64 reserved;
140		} __attribute__ ((packed)) i1394;
141		struct {
142			__u64 wwid;
143			__u64 lun;
144		} __attribute__ ((packed)) fibre;
145		struct {
146			__u64 identity_tag;
147			__u64 reserved;
148		} __attribute__ ((packed)) i2o;
149		struct {
150			__u32 array_number;
151			__u32 reserved1;
152			__u64 reserved2;
153		} __attribute__ ((packed)) raid;
154		struct {
155			__u8 device;
156			__u8 reserved1;
157			__u16 reserved2;
158			__u32 reserved3;
159			__u64 reserved4;
160		} __attribute__ ((packed)) sata;
161		struct {
162			__u64 reserved1;
163			__u64 reserved2;
164		} __attribute__ ((packed)) unknown;
165	} device_path;
166	__u8 reserved4;
167	__u8 checksum;
168} __attribute__ ((packed));
169
170struct edd_info {
171	__u8 device;
172	__u8 version;
173	__u16 interface_support;
174	__u16 legacy_max_cylinder;
175	__u8 legacy_max_head;
176	__u8 legacy_sectors_per_track;
177	struct edd_device_params params;
178} __attribute__ ((packed));
179
180struct edd {
181	unsigned int mbr_signature[EDD_MBR_SIG_MAX];
182	struct edd_info edd_info[EDDMAXNR];
183	unsigned char mbr_signature_nr;
184	unsigned char edd_info_nr;
185};
186
187#endif				/*!__ASSEMBLY__ */
188
189#endif				/* _LINUX_EDD_H */
190