2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 1998 Robert Nordier
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
21 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
22 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
23 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
24 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
25 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
26 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 #include <sys/types.h>
36 #define BTX_PGSIZE 0x1000 /* Page size */
37 #define BTX_PGBASE 0x5000 /* Start of page tables */
38 #define BTX_MAXCWR 0x3bc /* Max. btx_pgctl adjustment */
44 uint8_t btx_machid; /* Machine ID */
45 uint8_t btx_hdrsz; /* Header size */
46 uint8_t btx_magic[3]; /* Magic */
47 uint8_t btx_majver; /* Major version */
48 uint8_t btx_minver; /* Minor version */
49 uint8_t btx_flags; /* Flags */
50 uint16_t btx_pgctl; /* Paging control */
51 uint16_t btx_textsz; /* Text size */
52 uint32_t btx_entry; /* Client entry address */
56 #define BTX_I386 0xeb /* Intel i386 or compatible */
64 #define BTX_MAPONE 0x80 /* Start mapping at page 1 */
66 #define BTX_MAPPED(btx) (((btx).btx_pgctl | (BTX_PGSIZE / 4 - 1)) + 1)
67 #define BTX_ORIGIN(btx) (BTX_PGBASE + BTX_MAPPED(btx) * 4)
68 #define BTX_ENTRY(btx) (BTX_ORIGIN(btx) + 2 + (btx).btx_hdrsz)