src/m/ibms390.h

   1 /* machine description file template.
   2    Copyright (C) 1985, 1986, 2001 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 #define s390
  47
  48 /* Use type int rather than a union, to represent Lisp_Object */
  49 /* This is desirable for most machines.  */
  50
  51 #define NO_UNION_TYPE
  52
  53 /* Define EXPLICIT_SIGN_EXTEND if XINT must explicitly sign-extend
  54    the 24-bit bit field into an int.  In other words, if bit fields
  55    are always unsigned.
  56
  57    If you use NO_UNION_TYPE, this flag does not matter.  */
  58
  59 #define EXPLICIT_SIGN_EXTEND
  60
  61 /* Data type of load average, as read out of kmem.  */
  62
  63 #define LOAD_AVE_TYPE long
  64
  65 /* Convert that into an integer that is 100 for a load average of 1.0  */
  66
  67 #define LOAD_AVE_CVT(x) (int) (((double) (x)) * 100.0 / FSCALE)
  68
  69 /* Define CANNOT_DUMP on machines where unexec does not work.
  70    Then the function dump-emacs will not be defined
  71    and temacs will do (load "loadup") automatically unless told otherwise.  */
  72
  73 /* #define CANNOT_DUMP */
  74
  75 /* Define VIRT_ADDR_VARIES if the virtual addresses of
  76    pure and impure space as loaded can vary, and even their
  77    relative order cannot be relied on.
  78
  79    Otherwise Emacs assumes that text space precedes data space,
  80    numerically.  */
  81
  82 #define VIRT_ADDR_VARIES
  83
  84 /* Define C_ALLOCA if this machine does not support a true alloca
  85    and the one written in C should be used instead.
  86    Define HAVE_ALLOCA to say that the system provides a properly
  87    working alloca function and it should be used.
  88    Define neither one if an assembler-language alloca
  89    in the file alloca.s should be used.  */
  90
  91 /* #define C_ALLOCA */
  92 #define HAVE_ALLOCA
  93
  94 /* Define NO_REMAP if memory segmentation makes it not work well
  95    to change the boundary between the text section and data section
  96    when Emacs is dumped.  If you define this, the preloaded Lisp
  97    code will not be sharable; but that's better than failing completely.  */
  98
  99 /*#define NO_REMAP */
 100
 101 /* Some really obscure 4.2-based systems (like Sequent DYNIX)
 102  * do not support asynchronous I/O (using SIGIO) on sockets,
 103  * even though it works fine on tty's.  If you have one of
 104  * these systems, define the following, and then use it in
 105  * config.h (or elsewhere) to decide when (not) to use SIGIO.
 106  *
 107  * You'd think this would go in an operating-system description file,
 108  * but since it only occurs on some, but not all, BSD systems, the
 109  * reasonable place to select for it is in the machine description
 110  * file.
 111  */
 112
 113 /*#define NO_SOCK_SIGIO*/
 114
 115
 116 /* After adding support for a new system, modify the large case
 117    statement in the `configure' script to recognize reasonable
 118    configuration names, and add a description of the system to
 119    `etc/MACHINES'.
 120
 121    If you've just fixed a problem in an existing configuration file,
 122    you should also check `etc/MACHINES' to make sure its descriptions
 123    of known problems in that configuration should be updated.  */