src/m/windowsnt.h

   1 /* Machine description file for Windows NT.
   2
   3    Copyright (C) 1993, 1994 Free Software Foundation, Inc.
   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 /* The following line tells the configuration script what sort of
  22    operating system this machine is likely to run.
  23    USUAL-OPSYS="<name of system .h file here, without the s- or .h>"  */
  24
  25 /* The following three symbols give information on
  26  the size of various data types.  */
  27
  28 #define SHORTBITS 16            /* Number of bits in a short */
  29
  30 #define INTBITS 32              /* Number of bits in an int */
  31
  32 #define LONGBITS 32             /* Number of bits in a long */
  33
  34 /* Define BIG_ENDIAN iff lowest-numbered byte in a word
  35    is the most significant byte.  */
  36
  37 /* #define BIG_ENDIAN */
  38
  39 /* Define NO_ARG_ARRAY if you cannot take the address of the first of a
  40  * group of arguments and treat it as an array of the arguments.  */
  41
  42 #define NO_ARG_ARRAY
  43
  44 /* Define WORD_MACHINE if addresses and such have
  45  * to be corrected before they can be used as byte counts.  */
  46
  47 #define WORD_MACHINE
  48
  49 /* Now define a symbol for the cpu type, if your compiler
  50    does not define it automatically:
  51    Ones defined so far include vax, m68000, ns16000, pyramid,
  52    orion, tahoe, APOLLO and many others */
  53
  54 /* Use type int rather than a union, to represent Lisp_Object */
  55 /* This is desirable for most machines.  */
  56
  57 #define NO_UNION_TYPE
  58
  59 /* Define EXPLICIT_SIGN_EXTEND if XINT must explicitly sign-extend
  60    the 24-bit bit field into an int.  In other words, if bit fields
  61    are always unsigned.
  62
  63    If you use NO_UNION_TYPE, this flag does not matter.  */
  64
  65 #define EXPLICIT_SIGN_EXTEND
  66
  67 /* Data type of load average, as read out of kmem.  */
  68
  69 #define LOAD_AVE_TYPE long
  70
  71 /* Convert that into an integer that is 100 for a load average of 1.0  */
  72
  73 #define LOAD_AVE_CVT(x) (int) (((double) (x)) * 100.0 / FSCALE)
  74
  75 /* Define CANNOT_DUMP on machines where unexec does not work.
  76    Then the function dump-emacs will not be defined
  77    and temacs will do (load "loadup") automatically unless told otherwise.  */
  78
  79 /*
  80 #define CANNOT_DUMP     1
  81 #define CANNOT_UNEXEC   1
  82  */
  83
  84 /* Start and end of text and data.  */
  85 #define DATA_END        get_data_end ()
  86 #define DATA_START      get_data_start ()
  87
  88 /* Define VIRT_ADDR_VARIES if the virtual addresses of
  89    pure and impure space as loaded can vary, and even their
  90    relative order cannot be relied on.
  91
  92    Otherwise Emacs assumes that text space precedes data space,
  93    numerically.  */
  94
  95 /* Text does preceed data space, but this is never a safe assumption.  */
  96 #define VIRT_ADDR_VARIES
  97
  98 /* Define C_ALLOCA if this machine does not support a true alloca
  99    and the one written in C should be used instead.
 100    Define HAVE_ALLOCA to say that the system provides a properly
 101    working alloca function and it should be used.
 102    Define neither one if an assembler-language alloca
 103    in the file alloca.s should be used.  */
 104
 105 /* #define C_ALLOCA */
 106 #include <malloc.h>
 107 #define HAVE_ALLOCA
 108
 109 /* Define NO_REMAP if memory segmentation makes it not work well
 110    to change the boundary between the text section and data section
 111    when Emacs is dumped.  If you define this, the preloaded Lisp
 112    code will not be sharable; but that's better than failing completely.  */
 113
 114 /* #define NO_REMAP */
 115
 116 /* Some really obscure 4.2-based systems (like Sequent DYNIX)
 117  * do not support asynchronous I/O (using SIGIO) on sockets,
 118  * even though it works fine on tty's.  If you have one of
 119  * these systems, define the following, and then use it in
 120  * config.h (or elsewhere) to decide when (not) to use SIGIO.
 121  *
 122  * You'd think this would go in an operating-system description file,
 123  * but since it only occurs on some, but not all, BSD systems, the
 124  * reasonable place to select for it is in the machine description
 125  * file.
 126  */
 127
 128 /* #define NO_SOCK_SIGIO */
 129
 130 /* After adding support for a new system, modify the large case
 131    statement in the `configure' script to recognize reasonable
 132    configuration names, and add a description of the system to
 133    `etc/MACHINES'.
 134
 135    If you've just fixed a problem in an existing configuration file,
 136    you should also check `etc/MACHINES' to make sure its descriptions
 137    of known problems in that configuration should be updated.  */