code.delx.au - gnu-emacs/blob - 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 1, 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 /* The following three symbols give information on
  36  the size of various data types.  */
  37
  38 #define SHORTBITS 16            /* Number of bits in a short */
  39
  40 #define INTBITS 32              /* Number of bits in an int */
  41
  42 #define LONGBITS 32             /* Number of bits in a long */
  43
  44 /* Define BIG_ENDIAN iff lowest-numbered byte in a word
  45    is the most significant byte.  */
  46 /* ns16000 is not big-endian: lowest numbered byte is least significant. */
  47 #undef BIG_ENDIAN
  48
  49 /* Define NO_ARG_ARRAY if you cannot take the address of the first of a
  50  * group of arguments and treat it as an array of the arguments.  */
  51 /* ns16000 call sequence used on mg1 means that &arg = the args as an array */
  52 #undef NO_ARG_ARRAY
  53
  54 /* Define WORD_MACHINE if addresses and such have
  55  * to be corrected before they can be used as byte counts.  */
  56 /* ns16000 addresses are byte addresses */
  57 #undef WORD_MACHINE
  58
  59 /* Now define a symbol for the cpu type, if your compiler
  60    does not define it automatically:
  61    vax, m68000, ns16000, pyramid, orion, tahoe and APOLLO
  62    are the ones defined so far.  */
  63 /* Say this machine is a 16000 and an mg1, cpp says its a 32000 */
  64 #define ns16000
  65 #define mg1
  66
  67 /* Use type int rather than a union, to represent Lisp_Object */
  68 /* This is desirable for most machines.  */
  69 /* Not sure on mg-1 but this shouldn't hurt! */
  70 #define NO_UNION_TYPE
  71
  72 /* Define EXPLICIT_SIGN_EXTEND if XINT must explicitly sign-extend
  73    the 24-bit bit field into an int.  In other words, if bit fields
  74    are always unsigned.
  75
  76    If you use NO_UNION_TYPE, this flag does not matter.  */
  77
  78 #define EXPLICIT_SIGN_EXTEND
  79
  80 /* Data type of load average, as read out of kmem.  */
  81 /* mg1 its an unsigned long */
  82 #define LOAD_AVE_TYPE unsigned long
  83
  84 /* Convert that into an integer that is 100 for a load average of 1.0  */
  85 #define FSCALE  1000.0
  86 #define LOAD_AVE_CVT(x) (int) (((double) (x)) * 100.0 / FSCALE)
  87
  88 /* Define CANNOT_DUMP on machines where unexec does not work.
  89    Then the function dump-emacs will not be defined
  90    and temacs will do (load "loadup") automatically unless told otherwise.  */
  91 /* ns16000's have an unexec, so should the mg-1 */
  92 #undef CANNOT_DUMP
  93
  94 /* Define VIRT_ADDR_VARIES if the virtual addresses of
  95    pure and impure space as loaded can vary, and even their
  96    relative order cannot be relied on.
  97
  98    Otherwise Emacs assumes that text space precedes data space,
  99    numerically.  */
 100 /* hmmmm... not sure.  copied sequent.h */
 101 #undef VIRT_ADDR_VARIES
 102
 103 /* Define C_ALLOCA if this machine does not support a true alloca
 104    and the one written in C should be used instead.
 105    Define HAVE_ALLOCA to say that the system provides a properly
 106    working alloca function and it should be used.
 107    Define neither one if an assembler-language alloca
 108    in the file alloca.s should be used.  */
 109 /* hmmmm... again not sure.  so copied sequent.h again! */
 110 #undef C_ALLOCA
 111 #undef HAVE_ALLOCA
 112
 113 /* Define NO_REMAP if memory segmentation makes it not work well
 114    to change the boundary between the text section and data section
 115    when Emacs is dumped.  If you define this, the preloaded Lisp
 116    code will not be sharable; but that's better than failing completely.  */
 117 /* mapping seems screwy */
 118 #define NO_REMAP
 119
 120 /* Avoids a compiler bug */
 121 /* borrowed from sequent.h */