xref: /openbmc/u-boot/include/linux/edd.h (revision a02ab5ea)
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  * SPDX-License-Identifier:	GPL-2.0
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 
63 struct 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 
164 struct 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 
174 struct 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__
182 extern struct edd edd;
183 #endif /* __KERNEL__ */
184 #endif				/*!__ASSEMBLY__ */
185 
186 #endif				/* _LINUX_EDD_H */
187