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ahdi.h revision 1.1 
      1 /*
      2  * Copyright (c) 1995 Leo Weppelman.
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  * 3. All advertising materials mentioning features or use of this software
     14  *    must display the following acknowledgement:
     15  *      This product includes software developed by Leo Weppelman.
     16  * 4. The name of the author may not be used to endorse or promote products
     17  *    derived from this software without specific prior written permission
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     20  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     21  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     22  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     23  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     24  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     28  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #ifndef AHDI_H
     32 #define AHDI_H
     33 
     34 #define	AHDI_BSIZE	512		/* AHDI blocksize		*/
     35 #define	AHDI_BBLOCK	0		/* AHDI bootblock (root sector)	*/
     36 
     37 /*
     38  * Various `well known' AHDI partition identifiers.
     39  */
     40 #define AHDI_MKPID(x,y,z)	(   ((u_int32_t)(x) << 16)	\
     41 				  | ((u_int32_t)(y) << 8)	\
     42 				  | ((u_int32_t)(z))		\
     43 				)
     44 #define	AHDI_PID_XGM	AHDI_MKPID('X','G','M')
     45 #define	AHDI_PID_GEM	AHDI_MKPID('G','E','M')
     46 #define	AHDI_PID_BGM	AHDI_MKPID('B','G','M')
     47 #define	AHDI_PID_RAW	AHDI_MKPID('R','A','W')
     48 #define	AHDI_PID_SWP	AHDI_MKPID('S','W','P')
     49 #define	AHDI_PID_NBD	AHDI_MKPID('N','B','D')
     50 #define	AHDI_PID_NBR	AHDI_MKPID('N','B','R')
     51 #define	AHDI_PID_NBS	AHDI_MKPID('N','B','S')
     52 #define	AHDI_PID_NBU	AHDI_MKPID('N','B','U')
     53 
     54 /*
     55  * Format of AHDI boot block.
     56  */
     57 #define	AHDI_MAXRPD	4		/* max. # of partition descriptors */
     58 					/* in an AHDI bootblock (aka root) */
     59 #define	AHDI_MAXARPD	2		/* max. # of partition descriptors */
     60 
     61 /*
     62  * On-disk representation of the AHDI disklabel.
     63  */
     64 struct ahdi_part {
     65 	u_int8_t	ap_flg;		/* bit 0 is in-use flag            */
     66 	u_int8_t	ap_id[3];	/* id: GEM, BGM, XGM, UNX, MIX     */
     67 	u_int32_t	ap_st;		/* block where partition starts    */
     68 	u_int32_t	ap_size;	/* partition size in blocks        */
     69 };
     70 
     71 struct ahdi_root {
     72 	u_int8_t	 ar_fill[0x1c2];/* filler, can be boot code        */
     73 	u_int32_t	 ar_hdsize;	/* size of entire volume in blocks */
     74 	struct ahdi_part ar_parts[AHDI_MAXRPD]; /* root partition table    */
     75 	u_int32_t	 ar_bslst;	/* start of bad-sector list        */
     76 	u_int32_t	 ar_bslsize;	/* # of blocks in bad-sector list  */
     77 	u_int16_t	 ar_checksum;
     78 };
     79 
     80 /*
     81  * Partition table representation as generated by ahdi_getparts():
     82  */
     83 typedef struct {
     84 	char	id[4];
     85 	u_int	start;
     86 	u_int	end;
     87 	u_int	rsec;
     88 	u_int	rent;
     89 	int	mod;
     90 } part_t;
     91 
     92 typedef struct {
     93 	int	nparts;
     94 	part_t	*parts;
     95 } ptable_t;
     96 
     97 /*
     98  * Functions exported from ahdi.c
     99  */
    100 EXTERN u_int ahdi_getparts PROTO((disk_t *, ptable_t *, u_int, u_int));
    101 #endif /*  AHDI_H */
    102