src/m/template.h

   1 /* machine description file template.
   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 2, 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, Inc., 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, 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="<name of system .h file here, without the s- or .h>"  */
  25
  26 /* Define WORDS_BIG_ENDIAN iff lowest-numbered byte in a word
  27    is the most significant byte.  */
  28
  29 #define WORDS_BIG_ENDIAN
  30
  31 /* Define NO_ARG_ARRAY if you cannot take the address of the first of a
  32  * group of arguments and treat it as an array of the arguments.  */
  33
  34 #define NO_ARG_ARRAY
  35
  36 /* Define WORD_MACHINE if addresses and such have
  37  * to be corrected before they can be used as byte counts.  */
  38
  39 #define WORD_MACHINE
  40
  41 /* Now define a symbol for the cpu type, if your compiler
  42    does not define it automatically:
  43    Ones defined so far include vax, m68000, ns16000, pyramid,
  44    orion, tahoe, APOLLO and many others */
  45
  46 /* Use type int rather than a union, to represent Lisp_Object */
  47 /* This is desirable for most machines.  */
  48
  49 #define NO_UNION_TYPE
  50
  51 /* Define EXPLICIT_SIGN_EXTEND if XINT must explicitly sign-extend
  52    the 24-bit bit field into an int.  In other words, if bit fields
  53    are always unsigned.
  54
  55    If you use NO_UNION_TYPE, this flag does not matter.  */
  56
  57 #define EXPLICIT_SIGN_EXTEND
  58
  59 /* Data type of load average, as read out of kmem.  */
  60
  61 #define LOAD_AVE_TYPE long
  62
  63 /* Convert that into an integer that is 100 for a load average of 1.0  */
  64
  65 #define LOAD_AVE_CVT(x) (int) (((double) (x)) * 100.0 / FSCALE)
  66
  67 /* Define CANNOT_DUMP on machines where unexec does not work.
  68    Then the function dump-emacs will not be defined
  69    and temacs will do (load "loadup") automatically unless told otherwise.  */
  70
  71 #define CANNOT_DUMP
  72
  73 /* Define VIRT_ADDR_VARIES if the virtual addresses of
  74    pure and impure space as loaded can vary, and even their
  75    relative order cannot be relied on.
  76
  77    Otherwise Emacs assumes that text space precedes data space,
  78    numerically.  */
  79
  80 #define VIRT_ADDR_VARIES
  81
  82 /* Define C_ALLOCA if this machine does not support a true alloca
  83    and the one written in C should be used instead.
  84    Define HAVE_ALLOCA to say that the system provides a properly
  85    working alloca function and it should be used.
  86    Define neither one if an assembler-language alloca
  87    in the file alloca.s should be used.  */
  88
  89 #define C_ALLOCA
  90 #define HAVE_ALLOCA
  91
  92 /* Define NO_REMAP if memory segmentation makes it not work well
  93    to change the boundary between the text section and data section
  94    when Emacs is dumped.  If you define this, the preloaded Lisp
  95    code will not be sharable; but that's better than failing completely.  */
  96
  97 #define NO_REMAP
  98
  99 /* Some really obscure 4.2-based systems (like Sequent DYNIX)
 100  * do not support asynchronous I/O (using SIGIO) on sockets,
 101  * even though it works fine on tty's.  If you have one of
 102  * these systems, define the following, and then use it in
 103  * config.h (or elsewhere) to decide when (not) to use SIGIO.
 104  *
 105  * You'd think this would go in an operating-system description file,
 106  * but since it only occurs on some, but not all, BSD systems, the
 107  * reasonable place to select for it is in the machine description
 108  * file.
 109  */
 110
 111 #define NO_SOCK_SIGIO
 112
 113
 114 /* After adding support for a new system, modify the large case
 115    statement in the `configure' script to recognize reasonable
 116    configuration names, and add a description of the system to
 117    `etc/MACHINES'.
 118
 119    If you've just fixed a problem in an existing configuration file,
 120    you should also check `etc/MACHINES' to make sure its descriptions
 121    of known problems in that configuration should be updated.  */