/*      $NetBSD: mbr.h,v 1.6 2020/10/12 16:14:32 martin Exp $   */

/*
* Copyright 1997, 1988 Piermont Information Systems Inc.
* All rights reserved.
*
* Written by Philip A. Nelson for Piermont Information Systems Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
* 3. The name of Piermont Information Systems Inc. may not be used to endorse
*    or promote products derived from this software without specific prior
*    written permission.
*
* THIS SOFTWARE IS PROVIDED BY PIERMONT INFORMATION SYSTEMS INC. ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL PIERMONT INFORMATION SYSTEMS INC. BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*
*/

#ifndef _MBR_H
#define _MBR_H

/*
* mbr.h -- definitions for reading, writing and editing DOS MBRs.
* Use by including from md.h on ports  which use MBRs (i386, powerpc, arc)
* naming convention:  dlxxxx => NetBSD disklabel, bxxxx => bios
*/

/* constants and defines */

#include <sys/bootblock.h>

/*
* XXX  I (dsl) haven't the foggiest idea what the MBR extended chain
*      looks like if the sector size isn't 512.
*/
#define MBR_SECSIZE     512

#define MBR_PUT_LSCYL(c)                ((c) & 0xff)
#define MBR_PUT_MSCYLANDSEC(c,s)        (((s) & 0x3f) | (((c) >> 2) & 0xc0))

#define MBR_DEV_LEN     16              /* for wedge names */

typedef struct mbr_info_t mbr_info_t;
struct mbr_info_t {
       struct mbr_sector       mbr;
#ifdef BOOTSEL
       struct mbr_bootsel      mbrb;   /* writeable for any mbr code */
       uint            oflags;
#endif
       uint            sector;         /* where we read this from */
       mbr_info_t      *extended;      /* next in extended partition list */
       const char      *last_mounted[MBR_PART_COUNT];
       uint            fs_type[MBR_PART_COUNT], fs_sub_type[MBR_PART_COUNT];
#ifdef BOOTSEL
       /* only in first item... */
       uint            bootsec;        /* start sector of bootmenu default */
#endif
       /* for temporary access */
       char            wedge[MBR_PART_COUNT][MBR_DEV_LEN];
};

#ifdef BOOTSEL
extern struct mbr_bootsel *mbs;

       /* sync with src/sbin/fdisk/fdisk.c */
#define DEFAULT_BOOTDIR         "/usr/mdec"
#define DEFAULT_BOOTCODE        "mbr"
#define DEFAULT_BOOTSELCODE     "mbr_bootsel"
#define DEFAULT_BOOTEXTCODE     "mbr_ext"

/* Scan values for the various keys we use, as returned by the BIOS */
#define SCAN_ENTER      0x1c
#define SCAN_F1         0x3b
#define SCAN_1          0x2

#endif /* BOOTSEL */

/* from mbr.c */
void    set_fdisk_geom(void);   /* edit incore BIOS geometry */
void    disp_cur_geom(void);
int     check_geom(void);               /* primitive geometry sanity-check */

void    disp_cur_part(struct mbr_partition *, int, int);
int     partsoverlap(struct mbr_partition *, int, int);

/* from mbr.c */

int     guess_biosgeom_from_parts(struct disk_partitions*, int *, int *, int *);
/* same return values as edit_outer_parts() */
int     set_bios_geom_with_mbr_guess(struct disk_partitions*);
void    set_bios_geom(struct disk_partitions *, int *cyl, int *head, int *sec);
int     otherpart(int);
int     ourpart(int);
void    edit_ptn_bounds(void);
#ifdef BOOTSEL
void    disp_bootsel(void);
void    edit_bootsel_entry(int);
void    edit_bootsel_timeout(void);
void    edit_bootsel_default_ptn(int);
void    edit_bootsel_default_disk(int);
void    configure_bootsel(void);
#endif

/*
* MBR specific: check if the chosen partitioning will work
* and perform any MD queries/fixup.
* With quiet = true, try to avoid user interaction and
* never return 1.
*
* Return value:
*  0 -> abort
*  1 -> re-edit
*  2 -> continue installation
*/
int     md_check_mbr(struct disk_partitions*, mbr_info_t*, bool quiet);

/*
* Called early during updates (before md_pre_update),
* returns true if partitions have been modified.
*/
bool    md_mbr_update_check(struct disk_partitions*, mbr_info_t*);

#endif