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      1 /*	$NetBSD: mbr.h,v 1.6 2020/10/12 16:14:32 martin Exp $	*/
      2 
      3 /*
      4  * Copyright 1997, 1988 Piermont Information Systems Inc.
      5  * All rights reserved.
      6  *
      7  * Written by Philip A. Nelson for Piermont Information Systems Inc.
      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. The name of Piermont Information Systems Inc. may not be used to endorse
     18  *    or promote products derived from this software without specific prior
     19  *    written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY PIERMONT INFORMATION SYSTEMS INC. ``AS IS''
     22  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED. IN NO EVENT SHALL PIERMONT INFORMATION SYSTEMS INC. BE
     25  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     26  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     27  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     28  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     29  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     30  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
     31  * THE POSSIBILITY OF SUCH DAMAGE.
     32  *
     33  */
     34 
     35 #ifndef _MBR_H
     36 #define _MBR_H
     37 
     38 /*
     39  * mbr.h -- definitions for reading, writing and editing DOS MBRs.
     40  * Use by including from md.h on ports  which use MBRs (i386, powerpc, arc)
     41  * naming convention:  dlxxxx => NetBSD disklabel, bxxxx => bios
     42  */
     43 
     44 /* constants and defines */
     45 
     46 #include <sys/bootblock.h>
     47 
     48 /*
     49  * XXX  I (dsl) haven't the foggiest idea what the MBR extended chain
     50  *	looks like if the sector size isn't 512.
     51  */
     52 #define MBR_SECSIZE     512
     53 
     54 #define MBR_PUT_LSCYL(c)		((c) & 0xff)
     55 #define MBR_PUT_MSCYLANDSEC(c,s)	(((s) & 0x3f) | (((c) >> 2) & 0xc0))
     56 
     57 #define MBR_DEV_LEN	16		/* for wedge names */
     58 
     59 typedef struct mbr_info_t mbr_info_t;
     60 struct mbr_info_t {
     61 	struct mbr_sector	mbr;
     62 #ifdef BOOTSEL
     63 	struct mbr_bootsel	mbrb;	/* writeable for any mbr code */
     64 	uint		oflags;
     65 #endif
     66 	uint		sector;		/* where we read this from */
     67 	mbr_info_t	*extended;	/* next in extended partition list */
     68 	const char	*last_mounted[MBR_PART_COUNT];
     69 	uint		fs_type[MBR_PART_COUNT], fs_sub_type[MBR_PART_COUNT];
     70 #ifdef BOOTSEL
     71 	/* only in first item... */
     72 	uint		bootsec;	/* start sector of bootmenu default */
     73 #endif
     74 	/* for temporary access */
     75 	char		wedge[MBR_PART_COUNT][MBR_DEV_LEN];
     76 };
     77 
     78 #ifdef BOOTSEL
     79 extern struct mbr_bootsel *mbs;
     80 
     81 	/* sync with src/sbin/fdisk/fdisk.c */
     82 #define	DEFAULT_BOOTDIR		"/usr/mdec"
     83 #define	DEFAULT_BOOTCODE	"mbr"
     84 #define	DEFAULT_BOOTSELCODE	"mbr_bootsel"
     85 #define	DEFAULT_BOOTEXTCODE	"mbr_ext"
     86 
     87 /* Scan values for the various keys we use, as returned by the BIOS */
     88 #define	SCAN_ENTER	0x1c
     89 #define	SCAN_F1		0x3b
     90 #define	SCAN_1		0x2
     91 
     92 #endif /* BOOTSEL */
     93 
     94 /* from mbr.c */
     95 void	set_fdisk_geom(void);	/* edit incore BIOS geometry */
     96 void	disp_cur_geom(void);
     97 int	check_geom(void);		/* primitive geometry sanity-check */
     98 
     99 void	disp_cur_part(struct mbr_partition *, int, int);
    100 int 	partsoverlap(struct mbr_partition *, int, int);
    101 
    102 /* from mbr.c */
    103 
    104 int	guess_biosgeom_from_parts(struct disk_partitions*, int *, int *, int *);
    105 /* same return values as edit_outer_parts() */
    106 int	set_bios_geom_with_mbr_guess(struct disk_partitions*);
    107 void	set_bios_geom(struct disk_partitions *, int *cyl, int *head, int *sec);
    108 int	otherpart(int);
    109 int	ourpart(int);
    110 void	edit_ptn_bounds(void);
    111 #ifdef BOOTSEL
    112 void	disp_bootsel(void);
    113 void	edit_bootsel_entry(int);
    114 void	edit_bootsel_timeout(void);
    115 void	edit_bootsel_default_ptn(int);
    116 void	edit_bootsel_default_disk(int);
    117 void	configure_bootsel(void);
    118 #endif
    119 
    120 /*
    121  * MBR specific: check if the chosen partitioning will work
    122  * and perform any MD queries/fixup.
    123  * With quiet = true, try to avoid user interaction and
    124  * never return 1.
    125  *
    126  * Return value:
    127  *  0 -> abort
    128  *  1 -> re-edit
    129  *  2 -> continue installation
    130 */
    131 int	md_check_mbr(struct disk_partitions*, mbr_info_t*, bool quiet);
    132 
    133 /*
    134  * Called early during updates (before md_pre_update),
    135  * returns true if partitions have been modified.
    136  */
    137 bool	md_mbr_update_check(struct disk_partitions*, mbr_info_t*);
    138 
    139 #endif
    140