2 * linux/include/linux/edd.h
3 * Copyright (C) 2002, 2003, 2004 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
13 * table in the boot_params 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 #include <linux/types.h>
35 #define EDDNR 0x1e9 /* addr of number of edd_info structs at EDDBUF
36 in boot_params - treat this as 1 byte */
37 #define EDDBUF 0xd00 /* addr of edd_info structs in boot_params */
38 #define EDDMAXNR 6 /* number of edd_info structs starting at EDDBUF */
39 #define EDDEXTSIZE 8 /* change these if you muck with the structures */
40 #define EDDPARMSIZE 74
41 #define CHECKEXTENSIONSPRESENT 0x41
42 #define GETDEVICEPARAMETERS 0x48
43 #define LEGACYGETDEVICEPARAMETERS 0x08
44 #define EDDMAGIC1 0x55AA
45 #define EDDMAGIC2 0xAA55
48 #define READ_SECTORS 0x02 /* int13 AH=0x02 is READ_SECTORS command */
49 #define EDD_MBR_SIG_OFFSET 0x1B8 /* offset of signature in the MBR */
50 #define EDD_MBR_SIG_BUF 0x290 /* addr in boot params */
51 #define EDD_MBR_SIG_MAX 16 /* max number of signatures to store */
52 #define EDD_MBR_SIG_NR_BUF 0x1ea /* addr of number of MBR signtaures at EDD_MBR_SIG_BUF
53 in boot_params - treat this as 1 byte */
57 #define EDD_EXT_FIXED_DISK_ACCESS (1 << 0)
58 #define EDD_EXT_DEVICE_LOCKING_AND_EJECTING (1 << 1)
59 #define EDD_EXT_ENHANCED_DISK_DRIVE_SUPPORT (1 << 2)
60 #define EDD_EXT_64BIT_EXTENSIONS (1 << 3)
62 #define EDD_INFO_DMA_BOUNDARY_ERROR_TRANSPARENT (1 << 0)
63 #define EDD_INFO_GEOMETRY_VALID (1 << 1)
64 #define EDD_INFO_REMOVABLE (1 << 2)
65 #define EDD_INFO_WRITE_VERIFY (1 << 3)
66 #define EDD_INFO_MEDIA_CHANGE_NOTIFICATION (1 << 4)
67 #define EDD_INFO_LOCKABLE (1 << 5)
68 #define EDD_INFO_NO_MEDIA_PRESENT (1 << 6)
69 #define EDD_INFO_USE_INT13_FN50 (1 << 7)
71 struct edd_device_params {
74 __u32 num_default_cylinders;
75 __u32 num_default_heads;
76 __u32 sectors_per_track;
77 __u64 number_of_sectors;
78 __u16 bytes_per_sector;
79 __u32 dpte_ptr; /* 0xFFFFFFFF for our purposes */
80 __u16 key; /* = 0xBEDD */
81 __u8 device_path_info_length; /* = 44 */
84 __u8 host_bus_type[4];
85 __u8 interface_type[8];
91 } __attribute__ ((packed)) isa;
98 } __attribute__ ((packed)) pci;
99 /* pcix is same as pci */
102 } __attribute__ ((packed)) ibnd;
105 } __attribute__ ((packed)) xprs;
108 } __attribute__ ((packed)) htpt;
111 } __attribute__ ((packed)) unknown;
120 } __attribute__ ((packed)) ata;
128 } __attribute__ ((packed)) atapi;
134 } __attribute__ ((packed)) scsi;
138 } __attribute__ ((packed)) usb;
142 } __attribute__ ((packed)) i1394;
146 } __attribute__ ((packed)) fibre;
150 } __attribute__ ((packed)) i2o;
155 } __attribute__ ((packed)) raid;
162 } __attribute__ ((packed)) sata;
166 } __attribute__ ((packed)) unknown;
170 } __attribute__ ((packed));
175 __u16 interface_support;
176 __u16 legacy_max_cylinder;
177 __u8 legacy_max_head;
178 __u8 legacy_sectors_per_track;
179 struct edd_device_params params;
180 } __attribute__ ((packed));
183 unsigned int mbr_signature[EDD_MBR_SIG_MAX];
184 struct edd_info edd_info[EDDMAXNR];
185 unsigned char mbr_signature_nr;
186 unsigned char edd_info_nr;
190 extern struct edd edd;
191 #endif /* __KERNEL__ */
192 #endif /*!__ASSEMBLY__ */
194 #endif /* _LINUX_EDD_H */