code.delx.au - gnu-emacs/blob - 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 1, 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, 675 Mass Ave, Cambridge, MA 02139, USA.  */
  19
  20
  21 /* The following line tells the configuration script what sort of
  22    operating system this machine is likely to run.
  23    USUAL-OPSYS="note"
  24
  25 NOTE-START
  26 Use `-opsystem=bsd4-2' or `-opsystem=bsd4-3'.
  27 NOTE-END */
  28
  29 #define ISI68K
  30
  31 /* The following three symbols give information on
  32  the size of various data types.  */
  33
  34 #define SHORTBITS 16            /* Number of bits in a short */
  35
  36 #define INTBITS 32              /* Number of bits in an int */
  37
  38 #define LONGBITS 32             /* Number of bits in a long */
  39
  40 /* 68000 has lowest-numbered byte as most significant */
  41
  42 #define BIG_ENDIAN
  43
  44 /* Define how to take a char and sign-extend into an int.
  45    On machines where char is signed, this is a no-op.  */
  46
  47 #define SIGN_EXTEND_CHAR(c) (c)
  48
  49 /* Say this machine is a 68000 */
  50
  51 #define m68000
  52
  53 /* Use type int rather than a union, to represent Lisp_Object */
  54
  55 #define NO_UNION_TYPE
  56
  57 /* XINT must explicitly sign-extend */
  58
  59 #define EXPLICIT_SIGN_EXTEND
  60
  61 /* Data type of load average, as read out of kmem.  */
  62
  63 #ifdef BSD4_3
  64 #define LOAD_AVE_TYPE long
  65 #else
  66 #define LOAD_AVE_TYPE double
  67 #endif BSD4_3
  68
  69 /* Convert that into an integer that is 100 for a load average of 1.0  */
  70
  71 #ifdef BSD4_3
  72 #define LOAD_AVE_CVT(x) (int) (((double) (x)) * 100.0 / FSCALE)
  73 #else
  74 #define LOAD_AVE_CVT(x) ((int) ((x) * 100.0))
  75 #endif
  76
  77 /* Mask for address bits within a memory segment */
  78
  79 #define SEGMENT_MASK 0x1ffff
  80
  81 /* use the -20 switch to get the 68020 code */
  82 /* #define C_SWITCH_MACHINE -20 */
  83
  84 /* Use the version of the library for the 68020
  85    because the standard library requires some special hacks in crt0
  86    which the GNU crt0 does not have.  */
  87
  88 #define LIB_STANDARD -lmc
  89
  90 /* macros to make unexec work right */
  91
  92 #define A_TEXT_OFFSET(HDR) sizeof(HDR)
  93 #define A_TEXT_SEEK(HDR) sizeof(HDR)
  94
  95 /* A few changes for the newer systems.  */
  96
  97 #ifdef BSD4_3
  98 #define HAVE_ALLOCA
  99 /* The following line affects crt0.c.  */
 100 #undef m68k
 101
 102 #undef LIB_STANDARD
 103 #define LIB_STANDARD -lmc -lc
 104 #define C_DEBUG_SWITCH -20 -O -X23
 105 #endif