1 /* 2 * Copyright (c) 1998 Robert Nordier 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. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 17 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS 18 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 19 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT 20 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 21 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 22 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE 23 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, 24 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 * 26 * $FreeBSD$ 27 */ 28 29 #ifndef _BTX_H_ 30 #define _BTX_H_ 31 32 #include <sys/types.h> 33 34 #define BTX_PGSIZE 0x1000 /* Page size */ 35 #define BTX_PGBASE 0x5000 /* Start of page tables */ 36 #define BTX_MAXCWR 0x3bc /* Max. btx_pgctl adjustment */ 37 38 /* 39 * BTX image header. 40 */ 41 struct btx_hdr { 42 uint8_t btx_machid; /* Machine ID */ 43 uint8_t btx_hdrsz; /* Header size */ 44 uint8_t btx_magic[3]; /* Magic */ 45 uint8_t btx_majver; /* Major version */ 46 uint8_t btx_minver; /* Minor version */ 47 uint8_t btx_flags; /* Flags */ 48 uint16_t btx_pgctl; /* Paging control */ 49 uint16_t btx_textsz; /* Text size */ 50 uint32_t btx_entry; /* Client entry address */ 51 }; 52 53 /* btx_machid */ 54 #define BTX_I386 0xeb /* Intel i386 or compatible */ 55 56 /* btx_magic */ 57 #define BTX_MAG0 'B' 58 #define BTX_MAG1 'T' 59 #define BTX_MAG2 'X' 60 61 /* btx_flags */ 62 #define BTX_MAPONE 0x80 /* Start mapping at page 1 */ 63 64 #define BTX_MAPPED(btx) (((btx).btx_pgctl | (BTX_PGSIZE / 4 - 1)) + 1) 65 #define BTX_ORIGIN(btx) (BTX_PGBASE + BTX_MAPPED(btx) * 4) 66 #define BTX_ENTRY(btx) (BTX_ORIGIN(btx) + 2 + (btx).btx_hdrsz) 67 68 #endif /* !_BTX_H_ */ 69