src/m/isi-ov.h

   1 /* machine description file for ISI 68000's
   2    Copyright (C) 1985, 1986 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Emacs.
   5
   6 GNU Emacs is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Emacs is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Emacs; see the file COPYING.  If not, write to
  18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  20
  21
  22 /* The following line tells the configuration script what sort of
  23    operating system this machine is likely to run.
  24    USUAL-OPSYS="note"
  25
  26 NOTE-START
  27 Use `-opsystem=bsd4-2' or `-opsystem=bsd4-3'.
  28 NOTE-END */
  29
  30 #define ISI68K
  31
  32 /* Define WORDS_BIG_ENDIAN iff lowest-numbered byte in a word
  33    is the most significant byte.  */
  34
  35 #define WORDS_BIG_ENDIAN
  36
  37 /* Say this machine is a 68000 */
  38
  39 #define m68000
  40
  41 /* Use type int rather than a union, to represent Lisp_Object */
  42
  43 #define NO_UNION_TYPE
  44
  45 /* XINT must explicitly sign-extend */
  46
  47 #define EXPLICIT_SIGN_EXTEND
  48
  49 /* Data type of load average, as read out of kmem.  */
  50
  51 #ifdef BSD4_3
  52 #define LOAD_AVE_TYPE long
  53 #else
  54 #define LOAD_AVE_TYPE double
  55 #endif BSD4_3
  56
  57 /* Convert that into an integer that is 100 for a load average of 1.0  */
  58
  59 #ifdef BSD4_3
  60 #define LOAD_AVE_CVT(x) (int) (((double) (x)) * 100.0 / FSCALE)
  61 #else
  62 #define LOAD_AVE_CVT(x) ((int) ((x) * 100.0))
  63 #endif
  64
  65 /* Mask for address bits within a memory segment */
  66
  67 #define SEGMENT_MASK 0x1ffff
  68
  69 /* use the -20 switch to get the 68020 code */
  70 /* #define C_SWITCH_MACHINE -20 */
  71
  72 /* Use the version of the library for the 68020
  73    because the standard library requires some special hacks in crt0
  74    which the GNU crt0 does not have.  */
  75
  76 #define LIB_STANDARD -lmc
  77
  78 /* macros to make unexec work right */
  79
  80 #define A_TEXT_OFFSET(HDR) sizeof(HDR)
  81 #define A_TEXT_SEEK(HDR) sizeof(HDR)
  82
  83 /* A few changes for the newer systems.  */
  84
  85 #ifdef BSD4_3
  86 #define HAVE_ALLOCA
  87 /* The following line affects crt0.c.  */
  88 #undef m68k
  89
  90 #undef LIB_STANDARD
  91 #define LIB_STANDARD -lmc -lc
  92 #define C_DEBUG_SWITCH -20 -O -X23
  93 #endif