2 * linux/include/linux/edd.h
3 * Copyright (C) 2002, 2003 Dell Inc.
4 * by Matt Domsch <Matt_Domsch@dell.com>
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
12 * In a nutshell, arch/{i386,x86_64}/boot/setup.S populates a scratch table
13 * in the empty_zero_block that contains a list of BIOS-enumerated
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.
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
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.
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 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
45 #define READ_SECTORS 0x02
46 #define MBR_SIG_OFFSET 0x1B8
47 #define DISK80_SIG_BUFFER 0x2cc
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)
55 #define EDD_INFO_DMA_BOUNDARY_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)
64 struct edd_device_params {
67 u32 num_default_cylinders;
68 u32 num_default_heads;
69 u32 sectors_per_track;
70 u64 number_of_sectors;
72 u32 dpte_ptr; /* 0xFFFFFFFF for our purposes */
73 u16 key; /* = 0xBEDD */
74 u8 device_path_info_length; /* = 44 */
84 } __attribute__ ((packed)) isa;
91 } __attribute__ ((packed)) pci;
92 /* pcix is same as pci */
95 } __attribute__ ((packed)) ibnd;
98 } __attribute__ ((packed)) xprs;
101 } __attribute__ ((packed)) htpt;
104 } __attribute__ ((packed)) unknown;
113 } __attribute__ ((packed)) ata;
121 } __attribute__ ((packed)) atapi;
127 } __attribute__ ((packed)) scsi;
131 } __attribute__ ((packed)) usb;
135 } __attribute__ ((packed)) i1394;
139 } __attribute__ ((packed)) fibre;
143 } __attribute__ ((packed)) i2o;
148 } __attribute__ ((packed)) raid;
155 } __attribute__ ((packed)) sata;
159 } __attribute__ ((packed)) unknown;
163 } __attribute__ ((packed));
168 u16 interface_support;
169 u16 legacy_cylinders;
172 struct edd_device_params params;
173 } __attribute__ ((packed));
175 extern struct edd_info edd[EDDMAXNR];
176 extern unsigned char eddnr;
177 extern unsigned int edd_disk80_sig;
179 #endif /*!__ASSEMBLY__ */
181 #endif /* _LINUX_EDD_H */