1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 1998 Robert Nordier 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 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. 15 * 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. 27 * 28 * $FreeBSD$ 29 */ 30 31 #ifndef _BTX_H_ 32 #define _BTX_H_ 33 34 #include <sys/types.h> 35 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 */ 39 40 /* 41 * BTX image header. 42 */ 43 struct btx_hdr { 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 */ 53 }; 54 55 /* btx_machid */ 56 #define BTX_I386 0xeb /* Intel i386 or compatible */ 57 58 /* btx_magic */ 59 #define BTX_MAG0 'B' 60 #define BTX_MAG1 'T' 61 #define BTX_MAG2 'X' 62 63 /* btx_flags */ 64 #define BTX_MAPONE 0x80 /* Start mapping at page 1 */ 65 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) 69 70 #endif /* !_BTX_H_ */ 71