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gerrit.devboardsforandroid.linaro.org / platform / external / u-boot / bdba2b3a8809501b7073c242f9aa013eb456790d / . / include / linux / edd.h
blob: a83742fc7a70712299aa65867bebfe9f863ebad4 [file] [log] [blame]
Graeme Russ95ffaba2010-04-24 00:05:49 +1000[diff] [blame]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 *
Tom Rini5b8031c2016-01-14 22:05:13 -0500[diff] [blame]20 * SPDX-License-Identifier: GPL-2.0
Graeme Russ95ffaba2010-04-24 00:05:49 +1000[diff] [blame]21 */
22#ifndef _LINUX_EDD_H
23#define _LINUX_EDD_H
24
25#include <linux/types.h>
26
27#define EDDNR 0x1e9 /* addr of number of edd_info structs at EDDBUF
28 in boot_params - treat this as 1 byte */
29#define EDDBUF 0xd00 /* addr of edd_info structs in boot_params */
30#define EDDMAXNR 6 /* number of edd_info structs starting at EDDBUF */
31#define EDDEXTSIZE 8 /* change these if you muck with the structures */
32#define EDDPARMSIZE 74
33#define CHECKEXTENSIONSPRESENT 0x41
34#define GETDEVICEPARAMETERS 0x48
35#define LEGACYGETDEVICEPARAMETERS 0x08
36#define EDDMAGIC1 0x55AA
37#define EDDMAGIC2 0xAA55
38
39
40#define READ_SECTORS 0x02 /* int13 AH=0x02 is READ_SECTORS command */
41#define EDD_MBR_SIG_OFFSET 0x1B8 /* offset of signature in the MBR */
42#define EDD_MBR_SIG_BUF 0x290 /* addr in boot params */
43#define EDD_MBR_SIG_MAX 16 /* max number of signatures to store */
44#define EDD_MBR_SIG_NR_BUF 0x1ea /* addr of number of MBR signtaures at EDD_MBR_SIG_BUF
45 in boot_params - treat this as 1 byte */
46
47#ifndef __ASSEMBLY__
48
49#define EDD_EXT_FIXED_DISK_ACCESS (1 << 0)
50#define EDD_EXT_DEVICE_LOCKING_AND_EJECTING (1 << 1)
51#define EDD_EXT_ENHANCED_DISK_DRIVE_SUPPORT (1 << 2)
52#define EDD_EXT_64BIT_EXTENSIONS (1 << 3)
53
54#define EDD_INFO_DMA_BOUNDARY_ERROR_TRANSPARENT (1 << 0)
55#define EDD_INFO_GEOMETRY_VALID (1 << 1)
56#define EDD_INFO_REMOVABLE (1 << 2)
57#define EDD_INFO_WRITE_VERIFY (1 << 3)
58#define EDD_INFO_MEDIA_CHANGE_NOTIFICATION (1 << 4)
59#define EDD_INFO_LOCKABLE (1 << 5)
60#define EDD_INFO_NO_MEDIA_PRESENT (1 << 6)
61#define EDD_INFO_USE_INT13_FN50 (1 << 7)
62
63struct edd_device_params {
64 __u16 length;
65 __u16 info_flags;
66 __u32 num_default_cylinders;
67 __u32 num_default_heads;
68 __u32 sectors_per_track;
69 __u64 number_of_sectors;
70 __u16 bytes_per_sector;
71 __u32 dpte_ptr; /* 0xFFFFFFFF for our purposes */
72 __u16 key; /* = 0xBEDD */
73 __u8 device_path_info_length; /* = 44 */
74 __u8 reserved2;
75 __u16 reserved3;
76 __u8 host_bus_type[4];
77 __u8 interface_type[8];
78 union {
79 struct {
80 __u16 base_address;
81 __u16 reserved1;
82 __u32 reserved2;
83 } __attribute__ ((packed)) isa;
84 struct {
85 __u8 bus;
86 __u8 slot;
87 __u8 function;
88 __u8 channel;
89 __u32 reserved;
90 } __attribute__ ((packed)) pci;
91 /* pcix is same as pci */
92 struct {
93 __u64 reserved;
94 } __attribute__ ((packed)) ibnd;
95 struct {
96 __u64 reserved;
97 } __attribute__ ((packed)) xprs;
98 struct {
99 __u64 reserved;
100 } __attribute__ ((packed)) htpt;
101 struct {
102 __u64 reserved;
103 } __attribute__ ((packed)) unknown;
104 } interface_path;
105 union {
106 struct {
107 __u8 device;
108 __u8 reserved1;
109 __u16 reserved2;
110 __u32 reserved3;
111 __u64 reserved4;
112 } __attribute__ ((packed)) ata;
113 struct {
114 __u8 device;
115 __u8 lun;
116 __u8 reserved1;
117 __u8 reserved2;
118 __u32 reserved3;
119 __u64 reserved4;
120 } __attribute__ ((packed)) atapi;
121 struct {
122 __u16 id;
123 __u64 lun;
124 __u16 reserved1;
125 __u32 reserved2;
126 } __attribute__ ((packed)) scsi;
127 struct {
128 __u64 serial_number;
129 __u64 reserved;
130 } __attribute__ ((packed)) usb;
131 struct {
132 __u64 eui;
133 __u64 reserved;
134 } __attribute__ ((packed)) i1394;
135 struct {
136 __u64 wwid;
137 __u64 lun;
138 } __attribute__ ((packed)) fibre;
139 struct {
140 __u64 identity_tag;
141 __u64 reserved;
142 } __attribute__ ((packed)) i2o;
143 struct {
144 __u32 array_number;
145 __u32 reserved1;
146 __u64 reserved2;
147 } __attribute__ ((packed)) raid;
148 struct {
149 __u8 device;
150 __u8 reserved1;
151 __u16 reserved2;
152 __u32 reserved3;
153 __u64 reserved4;
154 } __attribute__ ((packed)) sata;
155 struct {
156 __u64 reserved1;
157 __u64 reserved2;
158 } __attribute__ ((packed)) unknown;
159 } device_path;
160 __u8 reserved4;
161 __u8 checksum;
162} __attribute__ ((packed));
163
164struct edd_info {
165 __u8 device;
166 __u8 version;
167 __u16 interface_support;
168 __u16 legacy_max_cylinder;
169 __u8 legacy_max_head;
170 __u8 legacy_sectors_per_track;
171 struct edd_device_params params;
172} __attribute__ ((packed));
173
174struct edd {
175 unsigned int mbr_signature[EDD_MBR_SIG_MAX];
176 struct edd_info edd_info[EDDMAXNR];
177 unsigned char mbr_signature_nr;
178 unsigned char edd_info_nr;
179};
180
181#ifdef __KERNEL__
182extern struct edd edd;
183#endif /* __KERNEL__ */
184#endif /*!__ASSEMBLY__ */
185
186#endif /* _LINUX_EDD_H */