usr/src/tools/btxld/btx.h

   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_ */