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, 675 Mass Ave, Cambridge, MA 02139, 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 We are in the dark about what operating system runs on the Whitechapel
  28 systems.  Consult share-lib/MACHINES for information on which
  29 operating systems Emacs has already been ported to; one of them might
  30 work.  If you find an existing system name that works or write your
  31 own configuration files, please let the Free Software Foundation in on
  32 your work; we'd like to distribute this information.
  33 NOTE-END  */
  34
  35 /* Define WORDS_BIG_ENDIAN iff lowest-numbered byte in a word
  36    is the most significant byte.  */
  37
  38 #undef WORDS_BIG_ENDIAN
  39
  40 /* Define NO_ARG_ARRAY if you cannot take the address of the first of a
  41  * group of arguments and treat it as an array of the arguments.  */
  42 /* ns16000 call sequence used on mg1 means that &arg = the args as an array */
  43 #undef NO_ARG_ARRAY
  44
  45 /* Define WORD_MACHINE if addresses and such have
  46  * to be corrected before they can be used as byte counts.  */
  47 /* ns16000 addresses are byte addresses */
  48 #undef WORD_MACHINE
  49
  50 /* Now define a symbol for the cpu type, if your compiler
  51    does not define it automatically:
  52    vax, m68000, ns16000, pyramid, orion, tahoe and APOLLO
  53    are the ones defined so far.  */
  54 /* Say this machine is a 16000 and an mg1, cpp says its a 32000 */
  55 #define ns16000
  56 #define mg1
  57
  58 /* Use type int rather than a union, to represent Lisp_Object */
  59 /* This is desirable for most machines.  */
  60 /* Not sure on mg-1 but this shouldn't hurt! */
  61 #define NO_UNION_TYPE
  62
  63 /* Define EXPLICIT_SIGN_EXTEND if XINT must explicitly sign-extend
  64    the 24-bit bit field into an int.  In other words, if bit fields
  65    are always unsigned.
  66
  67    If you use NO_UNION_TYPE, this flag does not matter.  */
  68
  69 #define EXPLICIT_SIGN_EXTEND
  70
  71 /* Data type of load average, as read out of kmem.  */
  72 /* mg1 its an unsigned long */
  73 #define LOAD_AVE_TYPE unsigned long
  74
  75 /* Convert that into an integer that is 100 for a load average of 1.0  */
  76 #define FSCALE  1000.0
  77 #define LOAD_AVE_CVT(x) (int) (((double) (x)) * 100.0 / FSCALE)
  78
  79 /* Define CANNOT_DUMP on machines where unexec does not work.
  80    Then the function dump-emacs will not be defined
  81    and temacs will do (load "loadup") automatically unless told otherwise.  */
  82 /* ns16000's have an unexec, so should the mg-1 */
  83 #undef CANNOT_DUMP
  84
  85 /* Define VIRT_ADDR_VARIES if the virtual addresses of
  86    pure and impure space as loaded can vary, and even their
  87    relative order cannot be relied on.
  88
  89    Otherwise Emacs assumes that text space precedes data space,
  90    numerically.  */
  91 /* hmmmm... not sure.  copied sequent.h */
  92 #undef VIRT_ADDR_VARIES
  93
  94 /* Define C_ALLOCA if this machine does not support a true alloca
  95    and the one written in C should be used instead.
  96    Define HAVE_ALLOCA to say that the system provides a properly
  97    working alloca function and it should be used.
  98    Define neither one if an assembler-language alloca
  99    in the file alloca.s should be used.  */
 100 /* hmmmm... again not sure.  so copied sequent.h again! */
 101 #undef C_ALLOCA
 102 #undef HAVE_ALLOCA
 103
 104 /* Define NO_REMAP if memory segmentation makes it not work well
 105    to change the boundary between the text section and data section
 106    when Emacs is dumped.  If you define this, the preloaded Lisp
 107    code will not be sharable; but that's better than failing completely.  */
 108 /* mapping seems screwy */
 109 #define NO_REMAP
 110
 111 /* Avoids a compiler bug */
 112 /* borrowed from sequent.h */