src/m/mg1.h

   1 /* machine description file for Whitechapel Computer Works MG1 (ns16000 based).
   2    Copyright (C) 1985 Free Software Foundation, Inc.
   3    MG-1 version by L.M.McLoughlin
   4
   5 This file is part of GNU Emacs.
   6
   7 GNU Emacs is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2, or (at your option)
  10 any later version.
  11
  12 GNU Emacs is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU Emacs; see the file COPYING.  If not, write to
  19 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  20 Boston, MA 02111-1307, USA.  */
  21
  22
  23 /* The following line tells the configuration script what sort of
  24    operating system this machine is likely to run.
  25    USUAL-OPSYS="note"
  26
  27 NOTE-START
  28 We are in the dark about what operating system runs on the Whitechapel
  29 systems.  Consult share-lib/MACHINES for information on which
  30 operating systems Emacs has already been ported to; one of them might
  31 work.  If you find an existing system name that works or write your
  32 own configuration files, please let the Free Software Foundation in on
  33 your work; we'd like to distribute this information.
  34 NOTE-END  */
  35
  36 /* Define WORDS_BIG_ENDIAN iff lowest-numbered byte in a word
  37    is the most significant byte.  */
  38
  39 #undef WORDS_BIG_ENDIAN
  40
  41 /* Define NO_ARG_ARRAY if you cannot take the address of the first of a
  42  * group of arguments and treat it as an array of the arguments.  */
  43 /* ns16000 call sequence used on mg1 means that &arg = the args as an array */
  44 #undef NO_ARG_ARRAY
  45
  46 /* Define WORD_MACHINE if addresses and such have
  47  * to be corrected before they can be used as byte counts.  */
  48 /* ns16000 addresses are byte addresses */
  49 #undef WORD_MACHINE
  50
  51 /* Now define a symbol for the cpu type, if your compiler
  52    does not define it automatically:
  53    vax, m68000, ns16000, pyramid, orion, tahoe and APOLLO
  54    are the ones defined so far.  */
  55 /* Say this machine is a 16000 and an mg1, cpp says its a 32000 */
  56 #define ns16000
  57 #define mg1
  58
  59 /* Use type int rather than a union, to represent Lisp_Object */
  60 /* This is desirable for most machines.  */
  61 /* Not sure on mg-1 but this shouldn't hurt! */
  62 #define NO_UNION_TYPE
  63
  64 /* Define EXPLICIT_SIGN_EXTEND if XINT must explicitly sign-extend
  65    the 24-bit bit field into an int.  In other words, if bit fields
  66    are always unsigned.
  67
  68    If you use NO_UNION_TYPE, this flag does not matter.  */
  69
  70 #define EXPLICIT_SIGN_EXTEND
  71
  72 /* Data type of load average, as read out of kmem.  */
  73 /* mg1 its an unsigned long */
  74 #define LOAD_AVE_TYPE unsigned long
  75
  76 /* Convert that into an integer that is 100 for a load average of 1.0  */
  77 #define FSCALE  1000.0
  78 #define LOAD_AVE_CVT(x) (int) (((double) (x)) * 100.0 / FSCALE)
  79
  80 /* Define CANNOT_DUMP on machines where unexec does not work.
  81    Then the function dump-emacs will not be defined
  82    and temacs will do (load "loadup") automatically unless told otherwise.  */
  83 /* ns16000's have an unexec, so should the mg-1 */
  84 #undef CANNOT_DUMP
  85
  86 /* Define VIRT_ADDR_VARIES if the virtual addresses of
  87    pure and impure space as loaded can vary, and even their
  88    relative order cannot be relied on.
  89
  90    Otherwise Emacs assumes that text space precedes data space,
  91    numerically.  */
  92 /* hmmmm... not sure.  copied sequent.h */
  93 #undef VIRT_ADDR_VARIES
  94
  95 /* Define C_ALLOCA if this machine does not support a true alloca
  96    and the one written in C should be used instead.
  97    Define HAVE_ALLOCA to say that the system provides a properly
  98    working alloca function and it should be used.
  99    Define neither one if an assembler-language alloca
 100    in the file alloca.s should be used.  */
 101 /* hmmmm... again not sure.  so copied sequent.h again! */
 102 #undef C_ALLOCA
 103 #undef HAVE_ALLOCA
 104
 105 /* Define NO_REMAP if memory segmentation makes it not work well
 106    to change the boundary between the text section and data section
 107    when Emacs is dumped.  If you define this, the preloaded Lisp
 108    code will not be sharable; but that's better than failing completely.  */
 109 /* mapping seems screwy */
 110 #define NO_REMAP
 111
 112 /* Avoids a compiler bug */
 113 /* borrowed from sequent.h */