4134f677eb
We don't need the 56 bytes at the end of bootinfo, and never had. Don't copy them from old boot loaders, and don't provide them with new boot loaders. Add comments about what versions of FreeBSD 'old' means in various contexts. Add note that old disk loader (from 1.x/2.x) is doomed to failure because it doesn't provide metadata that we now require to boot, and has been since approximately FreeBSD 7.x. Retain all this information to explain why we have 4 arguments that are always 0, even though it's ancient history. This saves 56 bytes in the boot loader. Sponsored by: Netflix Reviewed by: phk, rgrimes, kib Differential Revision: https://reviews.freebsd.org/D36550
113 lines
4.2 KiB
C
113 lines
4.2 KiB
C
/*-
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* SPDX-License-Identifier: BSD-4-Clause
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*
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* Copyright (C) 1994 by Rodney W. Grimes, Milwaukie, Oregon 97222
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer as
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* the first lines of this file unmodified.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Rodney W. Grimes.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY RODNEY W. GRIMES ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL RODNEY W. GRIMES BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _MACHINE_BOOTINFO_H_
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#define _MACHINE_BOOTINFO_H_
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/* Only change the version number if you break compatibility. */
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#define BOOTINFO_VERSION 1
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#define _WAS_N_BIOS_GEOM 8
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/*
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* A zero bootinfo field often means that there is no info available.
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* Assumes booting with a boot loader from FreeBSD 2.1 or newer and
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* that bi_size is always valid when bi_version == 1.
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*/
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struct bootinfo {
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u_int32_t bi_version; /* Must be 1 */
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u_int32_t bi_kernelname; /* represents a char * */
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u_int32_t bi_nfs_diskless; /* struct nfs_diskless * */
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u_int32_t _was_bi_n_bios_used;
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u_int32_t _was_bi_bios_geom[_WAS_N_BIOS_GEOM];
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u_int32_t bi_size;
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u_int8_t bi_memsizes_valid;
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u_int8_t bi_bios_dev; /* bootdev BIOS unit number (bootX -> loader only) */
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u_int8_t bi_pad[2];
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u_int32_t bi_basemem;
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u_int32_t bi_extmem;
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u_int32_t bi_symtab; /* struct symtab * */
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u_int32_t bi_esymtab; /* struct symtab * */
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/* Items below only from advanced bootloader */
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u_int32_t bi_kernend; /* end of kernel space */
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u_int32_t bi_envp; /* environment */
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u_int32_t bi_modulep; /* preloaded modules */
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};
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#ifdef _KERNEL
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extern struct bootinfo bootinfo;
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#endif
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/*
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* Constants for converting boot-style device number to type,
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* adaptor (uba, mba, etc), unit number and partition number.
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* Type (== major device number) is in the low byte
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* for backward compatibility. Except for that of the "magic
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* number", each mask applies to the shifted value.
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* Format:
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* (4) (8) (4) (8) (8)
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* --------------------------------
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* |MA | SLICE | UN| PART | TYPE |
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* --------------------------------
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*/
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#define B_SLICESHIFT 20
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#define B_SLICEMASK 0xff
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#define B_SLICE(val) (((val)>>B_SLICESHIFT) & B_SLICEMASK)
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#define B_UNITSHIFT 16
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#define B_UNITMASK 0xf
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#define B_UNIT(val) (((val) >> B_UNITSHIFT) & B_UNITMASK)
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#define B_PARTITIONSHIFT 8
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#define B_PARTITIONMASK 0xff
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#define B_PARTITION(val) (((val) >> B_PARTITIONSHIFT) & B_PARTITIONMASK)
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#define B_TYPESHIFT 0
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#define B_TYPEMASK 0xff
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#define B_TYPE(val) (((val) >> B_TYPESHIFT) & B_TYPEMASK)
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#define B_MAGICMASK 0xf0000000
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#define B_DEVMAGIC 0xa0000000
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#define MAKEBOOTDEV(type, slice, unit, partition) \
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(((type) << B_TYPESHIFT) | ((slice) << B_SLICESHIFT) | \
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((unit) << B_UNITSHIFT) | ((partition) << B_PARTITIONSHIFT) | \
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B_DEVMAGIC)
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#define BASE_SLICE 2
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#define COMPATIBILITY_SLICE 0
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#define MAX_SLICES 32
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#define WHOLE_DISK_SLICE 1
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#endif /* !_MACHINE_BOOTINFO_H_ */
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