freebsd-dev/sys/i386/include/bootinfo.h

/*-
 * Copyright (C) 1994 by Rodney W. Grimes, Milwaukie, Oregon  97222
 * 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 as
 *    the first lines of this file unmodified.
 * 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 Rodney W. Grimes.
 * 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 RODNEY W. GRIMES ``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 RODNEY W. GRIMES 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.
 *
 * $FreeBSD$
 */

#ifndef	_MACHINE_BOOTINFO_H_
#define	_MACHINE_BOOTINFO_H_

/* Only change the version number if you break compatibility. */
#define	BOOTINFO_VERSION	1

#define	N_BIOS_GEOM		8

/*
 * A zero bootinfo field often means that there is no info available.
 * Flags are used to indicate the validity of fields where zero is a
 * normal value.
 */
struct bootinfo {
	u_int32_t	bi_version;
	u_int32_t	bi_kernelname;		/* represents a char * */
	u_int32_t	bi_nfs_diskless;	/* struct nfs_diskless * */
				/* End of fields that are always present. */
#define	bi_endcommon	bi_n_bios_used
	u_int32_t	bi_n_bios_used;
	u_int32_t	bi_bios_geom[N_BIOS_GEOM];
	u_int32_t	bi_size;
	u_int8_t	bi_memsizes_valid;
	u_int8_t	bi_bios_dev;		/* bootdev BIOS unit number */
	u_int8_t	bi_pad[2];
	u_int32_t	bi_basemem;
	u_int32_t	bi_extmem;
	u_int32_t	bi_symtab;		/* struct symtab * */
	u_int32_t	bi_esymtab;		/* struct symtab * */
				/* Items below only from advanced bootloader */
	u_int32_t	bi_kernend;		/* end of kernel space */
	u_int32_t	bi_envp;		/* environment */
	u_int32_t	bi_modulep;		/* preloaded modules */
};

#ifdef _KERNEL
extern struct bootinfo	bootinfo;
#endif

/*
 * Constants for converting boot-style device number to type,
 * adaptor (uba, mba, etc), unit number and partition number.
 * Type (== major device number) is in the low byte
 * for backward compatibility.  Except for that of the "magic
 * number", each mask applies to the shifted value.
 * Format:
 *	 (4)   (8)   (4)  (8)     (8)
 *	--------------------------------
 *	|MA | SLICE | UN| PART  | TYPE |
 *	--------------------------------
 */
#define B_SLICESHIFT		20
#define B_SLICEMASK		0xff
#define B_SLICE(val)		(((val)>>B_SLICESHIFT) & B_SLICEMASK)
#define B_UNITSHIFT		16
#define B_UNITMASK		0xf
#define	B_UNIT(val)		(((val) >> B_UNITSHIFT) & B_UNITMASK)
#define B_PARTITIONSHIFT	8
#define B_PARTITIONMASK		0xff
#define	B_PARTITION(val)	(((val) >> B_PARTITIONSHIFT) & B_PARTITIONMASK)
#define	B_TYPESHIFT		0
#define	B_TYPEMASK		0xff
#define	B_TYPE(val)		(((val) >> B_TYPESHIFT) & B_TYPEMASK)

#define	B_MAGICMASK	0xf0000000
#define	B_DEVMAGIC	0xa0000000

#define	MAKEBOOTDEV(type, slice, unit, partition) \
	(((type) << B_TYPESHIFT) | ((slice) << B_SLICESHIFT) | \
	((unit) << B_UNITSHIFT) | ((partition) << B_PARTITIONSHIFT) | \
	B_DEVMAGIC)

#define	BASE_SLICE		2
#define	COMPATIBILITY_SLICE	0
#define	MAX_SLICES		32
#define	WHOLE_DISK_SLICE	1

#endif	/* !_MACHINE_BOOTINFO_H_ */