The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*-
    2  * Copyright (C) 1994 by Rodney W. Grimes, Milwaukie, Oregon  97222
    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 as
   10  *    the first lines of this file unmodified.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  * 3. All advertising materials mentioning features or use of this software
   15  *    must display the following acknowledgement:
   16  *      This product includes software developed by Rodney W. Grimes.
   17  * 4. The name of the author may not be used to endorse or promote products
   18  *    derived from this software without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY RODNEY W. GRIMES ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL RODNEY W. GRIMES BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  *
   32  * $FreeBSD: src/sys/i386/include/bootinfo.h,v 1.15 2003/04/04 16:35:15 phk Exp $
   33  */
   34 
   35 #ifndef _MACHINE_BOOTINFO_H_
   36 #define _MACHINE_BOOTINFO_H_
   37 
   38 /* Only change the version number if you break compatibility. */
   39 #define BOOTINFO_VERSION        1
   40 
   41 #define N_BIOS_GEOM             8
   42 
   43 /*
   44  * A zero bootinfo field often means that there is no info available.
   45  * Flags are used to indicate the validity of fields where zero is a
   46  * normal value.
   47  */
   48 struct bootinfo {
   49         u_int32_t       bi_version;
   50         u_int32_t       bi_kernelname;          /* represents a char * */
   51         u_int32_t       bi_nfs_diskless;        /* struct nfs_diskless * */
   52                                 /* End of fields that are always present. */
   53 #define bi_endcommon    bi_n_bios_used
   54         u_int32_t       bi_n_bios_used;
   55         u_int32_t       bi_bios_geom[N_BIOS_GEOM];
   56         u_int32_t       bi_size;
   57         u_int8_t        bi_memsizes_valid;
   58         u_int8_t        bi_bios_dev;            /* bootdev BIOS unit number */
   59         u_int8_t        bi_pad[2];
   60         u_int32_t       bi_basemem;
   61         u_int32_t       bi_extmem;
   62         u_int32_t       bi_symtab;              /* struct symtab * */
   63         u_int32_t       bi_esymtab;             /* struct symtab * */
   64                                 /* Items below only from advanced bootloader */
   65         u_int32_t       bi_kernend;             /* end of kernel space */
   66         u_int32_t       bi_envp;                /* environment */
   67         u_int32_t       bi_modulep;             /* preloaded modules */
   68 };
   69 
   70 #ifdef _KERNEL
   71 extern struct bootinfo  bootinfo;
   72 #endif
   73 
   74 /*
   75  * Constants for converting boot-style device number to type,
   76  * adaptor (uba, mba, etc), unit number and partition number.
   77  * Type (== major device number) is in the low byte
   78  * for backward compatibility.  Except for that of the "magic
   79  * number", each mask applies to the shifted value.
   80  * Format:
   81  *       (4) (4) (4) (4)  (8)     (8)
   82  *      --------------------------------
   83  *      |MA | AD| CT| UN| PART  | TYPE |
   84  *      --------------------------------
   85  */
   86 #define B_ADAPTORSHIFT          24
   87 #define B_ADAPTORMASK           0x0f
   88 #define B_ADAPTOR(val)          (((val) >> B_ADAPTORSHIFT) & B_ADAPTORMASK)
   89 #define B_CONTROLLERSHIFT       20
   90 #define B_CONTROLLERMASK        0xf
   91 #define B_CONTROLLER(val)       (((val)>>B_CONTROLLERSHIFT) & B_CONTROLLERMASK)
   92 #define B_SLICESHIFT            20
   93 #define B_SLICEMASK             0xff
   94 #define B_SLICE(val)            (((val)>>B_SLICESHIFT) & B_SLICEMASK)
   95 #define B_UNITSHIFT             16
   96 #define B_UNITMASK              0xf
   97 #define B_UNIT(val)             (((val) >> B_UNITSHIFT) & B_UNITMASK)
   98 #define B_PARTITIONSHIFT        8
   99 #define B_PARTITIONMASK         0xff
  100 #define B_PARTITION(val)        (((val) >> B_PARTITIONSHIFT) & B_PARTITIONMASK)
  101 #define B_TYPESHIFT             0
  102 #define B_TYPEMASK              0xff
  103 #define B_TYPE(val)             (((val) >> B_TYPESHIFT) & B_TYPEMASK)
  104 
  105 #define B_MAGICMASK     0xf0000000
  106 #define B_DEVMAGIC      0xa0000000
  107 
  108 #define MAKEBOOTDEV(type, adaptor, controller, unit, partition) \
  109         (((type) << B_TYPESHIFT) | ((adaptor) << B_ADAPTORSHIFT) | \
  110         ((controller) << B_CONTROLLERSHIFT) | ((unit) << B_UNITSHIFT) | \
  111         ((partition) << B_PARTITIONSHIFT) | B_DEVMAGIC)
  112 
  113 #define BASE_SLICE              2
  114 #define COMPATIBILITY_SLICE     0
  115 #define MAX_SLICES              32
  116 #define WHOLE_DISK_SLICE        1
  117 
  118 #endif  /* !_MACHINE_BOOTINFO_H_ */

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