FreeBSD/Linux Kernel Cross Reference
sys/i386/include/bootinfo.h

     /*-
      * SPDX-License-Identifier: BSD-4-Clause
      *
      * 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 _WAS_N_BIOS_GEOM        8
    
    /*
     * A zero bootinfo field often means that there is no info available.
     * Assumes booting with a boot loader from FreeBSD 2.1 or newer and
     * that bi_size is always valid when bi_version == 1.
     */
    struct bootinfo {
            u_int32_t       bi_version;             /* Must be 1 */
            u_int32_t       bi_kernelname;          /* represents a char * */
            u_int32_t       bi_nfs_diskless;        /* struct nfs_diskless * */
            u_int32_t       _was_bi_n_bios_used;
            u_int32_t       _was_bi_bios_geom[_WAS_N_BIOS_GEOM];
            u_int32_t       bi_size;
            u_int8_t        bi_memsizes_valid;
            u_int8_t        bi_bios_dev;    /* bootdev BIOS unit number (bootX -> loader only) */
            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_ */

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