disklabel.h

国产CPU－龙芯（loongson)BIOS源代码

/*	$OpenBSD: disklabel.h,v 1.13 1999/12/04 03:35:57 deraadt Exp $	*/

/*
 * Copyright (c) 1994 Christopher G. Demetriou
 * All rights reserved.
 *
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by Christopher G. Demetriou.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 THE AUTHOR 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 _MACHINE_DISKLABEL_H_
#define _MACHINE_DISKLABEL_H_

#define	LABELSECTOR	1		/* sector containing label */
#define	LABELOFFSET	0		/* offset of label in sector */
#define	MAXPARTITIONS	16		/* number of partitions */
#define	RAW_PART	2		/* raw partition: ie. rsd0c */

/* MBR partition table */
#define	DOSBBSECTOR	0		/* MBR sector number */
#define	DOSPARTOFF	446		/* Offset of MBR partition table */
#define	NDOSPART	4		/* # of partitions in MBR */
#define	DOSMAGICOFF	510		/* Offset of magic number */
#define	DOSMAGIC	0xaa55		/* Actual magic number */
#define	MBRMAGIC	DOSMAGIC
#define DOSMBR_SIGNATURE MBRMAGIC
#define DOSMBR_SIGNATURE_OFF DOSMAGICOFF
#define	DOSACTIVE	0x80

struct dos_partition {
	unsigned char	dp_flag;	/* default boot flag */
	unsigned char	dp_shd;	/* start head, IsN't Always Meaningful */
	unsigned char	dp_ssect;	/* start sector, INAM */
	unsigned char	dp_scyl;	/* start cylinder, INAM */
	unsigned char	dp_typ;		/* partition type */
	unsigned char	dp_ehd;	/* end head, INAM */
	unsigned char	dp_esect;	/* end sector, INAM */
	unsigned char	dp_ecyl;	/* end cylinder, INAM */
	unsigned long	dp_start;	/* absolute start sector number */
	unsigned long	dp_size;	/* partition size in sectors */
};

/* Known DOS partition types. */
#define	DOSPTYP_UNUSED	0x00		/* Unused partition */
#define DOSPTYP_FAT12	0x01		/* 12-bit FAT */
#define DOSPTYP_FAT16S	0x04		/* 16-bit FAT, less than 32M */
#define DOSPTYP_EXTEND	0x05		/* Extended; contains sub-partitions */
#define DOSPTYP_FAT16B	0x06		/* 16-bit FAT, more than 32M */
#define DOSPTYP_FAT32	0x0b		/* 32-bit FAT */
#define DOSPTYP_FAT32L	0x0c		/* 32-bit FAT, LBA-mapped */
#define DOSPTYP_FAT16C	0x0e		/* 16-bit FAT, CHS-mapped */
#define DOSPTYP_EXTENDL 0x0f		/* Extended, LBA-mapped; contains sub-partitions */
#define DOSPTYP_ONTRACK	0x54
#define	DOSPTYP_LINUX	0x83		/* That other thing */
#define DOSPTYP_FREEBSD	0xa5		/* FreeBSD partition type */
#define DOSPTYP_OPENBSD	0xa6		/* OpenBSD partition type */
#define DOSPTYP_NETBSD	0xa9		/* NetBSD partition type */

#include <sys/dkbad.h>
struct cpu_disklabel {
	struct dos_partition dosparts[NDOSPART];
	struct dkbad bad;
};

#define DKBAD(x) ((x)->bad)

/* Isolate the relevant bits to get sector and cylinder. */
#define	DPSECT(s)	((s) & 0x3f)
#define	DPCYL(c, s)	((c) + (((s) & 0xc0) << 2))

static __inline u_int32_t get_le __P((void *p));

static __inline u_int32_t
#ifdef __cplusplus
get_le(void *p)
#else
get_le(p)
	void *p;
#endif
{
	u_int8_t *_p = (u_int8_t *)p;
	int x;
	x = _p[0];
	x |= _p[1] << 8;
	x |= _p[2] << 16;
	x |= _p[3] << 24;
	return x;
}

#endif /* _MACHINE_DISKLABEL_H_ */