xref: /minix/sys/arch/i386/stand/lib/biosdisk_ll.h (revision 58a2b000)
1 /*	$NetBSD: biosdisk_ll.h,v 1.15 2007/12/25 18:33:34 perry Exp $	 */
2 
3 /*
4  * Copyright (c) 1996
5  * 	Matthias Drochner.  All rights reserved.
6  * Copyright (c) 1996
7  * 	Perry E. Metzger.  All rights reserved.
8  *
9  * Redistribution and use in source and binary forms, with or without
10  * modification, are permitted provided that the following conditions
11  * are met:
12  * 1. Redistributions of source code must retain the above copyright
13  *    notice, this list of conditions and the following disclaimer.
14  * 2. Redistributions in binary form must reproduce the above copyright
15  *    notice, this list of conditions and the following disclaimer in the
16  *    documentation and/or other materials provided with the distribution.
17  * 3. All advertising materials mentioning features or use of this software
18  *    must display the following acknowledgements:
19  *	This product includes software developed for the NetBSD Project
20  *	by Matthias Drochner.
21  *	This product includes software developed for the NetBSD Project
22  *	by Perry E. Metzger.
23  * 4. The names of the authors may not be used to endorse or promote products
24  *    derived from this software without specific prior written permission.
25  *
26  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
27  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
28  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
29  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
30  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
31  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
32  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
33  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
35  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36  */
37 
38 /*
39  * shared by bootsector startup (bootsectmain) and biosdisk.c needs lowlevel
40  * parts from bios_disk.S
41  */
42 
43 /*
44  * Beware that bios_disk.S relies on the offsets of the structure
45  * members.
46  */
47 struct biosdisk_ll {
48 	int             dev;		/* BIOS device number */
49 	int		type;		/* device type; see below */
50 	int             sec, head, cyl;	/* geometry */
51 	int		flags;		/* see below */
52 	int		chs_sectors;	/* # of sectors addressable by CHS */
53 	int		secsize;	/* bytes per sector */
54 };
55 #define	BIOSDISK_INT13EXT	1	/* BIOS supports int13 extension */
56 
57 #define BIOSDISK_TYPE_FD	0
58 #define BIOSDISK_TYPE_HD	1
59 #define BIOSDISK_TYPE_CD	2
60 
61 /*
62  * Version 1.x drive parameters from int13 extensions
63  * - should be supported by every BIOS that supports the extensions.
64  * Version 3.x parameters allow the drives to be matched properly
65  * - but are much less likely to be supported.
66  */
67 
68 struct biosdisk_extinfo {
69 	uint16_t	size;		/* size of buffer, set on call */
70 	uint16_t	flags;		/* flags, see below */
71 	uint32_t	cyl;		/* # of physical cylinders */
72 	uint32_t	head;		/* # of physical heads */
73 	uint32_t	sec;		/* # of physical sectors per track */
74 	uint64_t	totsec;		/* total number of sectors */
75 	uint16_t	sbytes;		/* # of bytes per sector */
76 #if defined(BIOSDISK_EXTINFO_V2) || defined(BIOSDISK_EXTINFO_V3)
77 	/* v2.0 extensions */
78 	uint32_t	edd_cfg;	/* EDD configuration parameters */
79 #if defined(BIOSDISK_EXTINFO_V3)
80 	/* v3.0 extensions */
81 	uint16_t	devpath_sig;	/* 0xbedd if path info present */
82 #define EXTINFO_DEVPATH_SIGNATURE	0xbedd
83 	uint8_t		devpath_len;	/* length from devpath_sig */
84 	uint8_t		fill21[3];
85 	char		host_bus[4];	/* Probably "ISA" or "PCI" */
86 	char		iface_type[8];	/* "ATA", "ATAPI", "SCSI" etc */
87 	union {
88 		uint8_t		ip_8[8];
89 		uint16_t	ip_16[4];
90 		uint32_t	ip_32[2];
91 		uint64_t	ip_64[1];
92 	} interface_path;
93 #define	ip_isa_iobase	ip_16[0];	/* iobase for ISA bus */
94 #define	ip_pci_bus	ip_8[0];	/* PCI bus number */
95 #define	ip_pci_device	ip_8[1];	/* PCI device number */
96 #define	ip_pci_function	ip_8[2];	/* PCI function number */
97 	union {
98 		uint8_t		dp_8[8];
99 		uint16_t	dp_16[4];
100 		uint32_t	dp_32[2];
101 		uint64_t	dp_64[1];
102 	} device_path;
103 #define	dp_ata_slave	dp_8[0];
104 #define	dp_atapi_slave	dp_8[0];
105 #define	dp_atapi_lun	dp_8[1];
106 #define	dp_scsi_lun	dp_8[0];
107 #define	dp_firewire_guid dp_64[0];
108 #define	dp_fibrechnl_wwn dp_64[0];
109 	uint8_t		fill40[1];
110 	uint8_t		checksum;	/* byte sum from dev_path_sig is 0 */
111 #endif /* BIOSDISK_EXTINFO_V3 */
112 #endif /* BIOSDISK_EXTINFO_V2 */
113 } __packed;
114 
115 #define EXTINFO_DMA_TRANS	0x0001	/* transparent DMA boundary errors */
116 #define EXTINFO_GEOM_VALID	0x0002	/* geometry in c/h/s in struct valid */
117 #define EXTINFO_REMOVABLE	0x0004	/* removable device */
118 #define EXTINFO_WRITEVERF	0x0008	/* supports write with verify */
119 #define EXTINFO_CHANGELINE	0x0010	/* changeline support */
120 #define EXTINFO_LOCKABLE	0x0020	/* device is lockable */
121 #define EXTINFO_MAXGEOM		0x0040	/* geometry set to max; no media */
122 
123 #define BIOSDISK_DEFAULT_SECSIZE	512
124 
125 int set_geometry(struct biosdisk_ll *, struct biosdisk_extinfo *);
126 int readsects(struct biosdisk_ll *, daddr_t, int, char *, int);
127