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 * SPDX-License-Identifier: GPL-2.0
25 #include <linux/types.h>
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
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 */
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)
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)
63 struct edd_device_params {
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 */
76 __u8 host_bus_type[4];
77 __u8 interface_type[8];
83 } __attribute__ ((packed)) isa;
90 } __attribute__ ((packed)) pci;
91 /* pcix is same as pci */
94 } __attribute__ ((packed)) ibnd;
97 } __attribute__ ((packed)) xprs;
100 } __attribute__ ((packed)) htpt;
103 } __attribute__ ((packed)) unknown;
112 } __attribute__ ((packed)) ata;
120 } __attribute__ ((packed)) atapi;
126 } __attribute__ ((packed)) scsi;
130 } __attribute__ ((packed)) usb;
134 } __attribute__ ((packed)) i1394;
138 } __attribute__ ((packed)) fibre;
142 } __attribute__ ((packed)) i2o;
147 } __attribute__ ((packed)) raid;
154 } __attribute__ ((packed)) sata;
158 } __attribute__ ((packed)) unknown;
162 } __attribute__ ((packed));
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));
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;
182 extern struct edd edd;
183 #endif /* __KERNEL__ */
184 #endif /*!__ASSEMBLY__ */
186 #endif /* _LINUX_EDD_H */