src/m/mg1.h

   1 /* machine description file for Whitechapel Computer Works MG1 (ns16000 based).
   2    Copyright (C) 1985, 2002, 2003, 2004, 2005,
   3                  2006 Free Software Foundation, Inc.
   4    MG-1 version by L.M.McLoughlin
   5
   6 This file is part of GNU Emacs.
   7
   8 GNU Emacs is free software; you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation; either version 2, or (at your option)
  11 any later version.
  12
  13 GNU Emacs is distributed in the hope that it will be useful,
  14 but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 GNU General Public License for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GNU Emacs; see the file COPYING.  If not, write to
  20 the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  21 Boston, MA 02110-1301, USA.  */
  22
  23
  24 /* The following line tells the configuration script what sort of
  25    operating system this machine is likely to run.
  26    USUAL-OPSYS="note"
  27
  28 NOTE-START
  29 We are in the dark about what operating system runs on the Whitechapel
  30 systems.  Consult share-lib/MACHINES for information on which
  31 operating systems Emacs has already been ported to; one of them might
  32 work.  If you find an existing system name that works or write your
  33 own configuration files, please let the Free Software Foundation in on
  34 your work; we'd like to distribute this information.
  35 NOTE-END  */
  36
  37 /* Define WORDS_BIG_ENDIAN iff lowest-numbered byte in a word
  38    is the most significant byte.  */
  39
  40 #undef WORDS_BIG_ENDIAN
  41
  42 /* Define NO_ARG_ARRAY if you cannot take the address of the first of a
  43  * group of arguments and treat it as an array of the arguments.  */
  44 /* ns16000 call sequence used on mg1 means that &arg = the args as an array */
  45 #undef NO_ARG_ARRAY
  46
  47 /* Define WORD_MACHINE if addresses and such have
  48  * to be corrected before they can be used as byte counts.  */
  49 /* ns16000 addresses are byte addresses */
  50 #undef WORD_MACHINE
  51
  52 /* Now define a symbol for the cpu type, if your compiler
  53    does not define it automatically:
  54    vax, m68000, ns16000, pyramid, orion, tahoe and APOLLO
  55    are the ones defined so far.  */
  56 /* Say this machine is a 16000 and an mg1, cpp says its a 32000 */
  57 #define ns16000
  58 #define mg1
  59
  60 /* Use type int rather than a union, to represent Lisp_Object */
  61 /* This is desirable for most machines.  */
  62 /* Not sure on mg-1 but this shouldn't hurt! */
  63 #define NO_UNION_TYPE
  64
  65 /* Define EXPLICIT_SIGN_EXTEND if XINT must explicitly sign-extend
  66    the 24-bit bit field into an int.  In other words, if bit fields
  67    are always unsigned.
  68
  69    If you use NO_UNION_TYPE, this flag does not matter.  */
  70
  71 #define EXPLICIT_SIGN_EXTEND
  72
  73 /* Data type of load average, as read out of kmem.  */
  74 /* mg1 its an unsigned long */
  75 #define LOAD_AVE_TYPE unsigned long
  76
  77 /* Convert that into an integer that is 100 for a load average of 1.0  */
  78 #define FSCALE  1000.0
  79 #define LOAD_AVE_CVT(x) (int) (((double) (x)) * 100.0 / FSCALE)
  80
  81 /* Define CANNOT_DUMP on machines where unexec does not work.
  82    Then the function dump-emacs will not be defined
  83    and temacs will do (load "loadup") automatically unless told otherwise.  */
  84 /* ns16000's have an unexec, so should the mg-1 */
  85 #undef CANNOT_DUMP
  86
  87 /* Define VIRT_ADDR_VARIES if the virtual addresses of
  88    pure and impure space as loaded can vary, and even their
  89    relative order cannot be relied on.
  90
  91    Otherwise Emacs assumes that text space precedes data space,
  92    numerically.  */
  93 /* hmmmm... not sure.  copied sequent.h */
  94 #undef VIRT_ADDR_VARIES
  95
  96 /* Define NO_REMAP if memory segmentation makes it not work well
  97    to change the boundary between the text section and data section
  98    when Emacs is dumped.  If you define this, the preloaded Lisp
  99    code will not be sharable; but that's better than failing completely.  */
 100 /* mapping seems screwy */
 101 #define NO_REMAP
 102
 103 /* Avoids a compiler bug */
 104 /* borrowed from sequent.h */
 105
 106 /* arch-tag: e15d9072-9e1a-44bf-8add-966be535967b
 107    (do not change this comment) */