src/m/intel386.h

   1 /* Machine description file for intel 386.
   2    Copyright (C) 1987, 2001, 2002, 2003, 2004, 2005, 2006, 2007,
   3                  2008, 2009, 2010, 2011  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 3 of the License, or
  10 (at your option) 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.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20
  21 /* The following line tells the configuration script what sort of
  22    operating system this machine is likely to run.
  23    USUAL-OPSYS="note"
  24
  25 NOTE-START
  26 Intel 386 (-machine=intel386)
  27
  28   The possibilities for -opsystem are: bsd4-2, usg5-2-2, usg5-3,
  29   isc2-2, 386-ix, and linux.
  30
  31   18.58 should support a wide variety of operating systems.
  32   Use linux for Linux.
  33   It isn't clear what to do on an SCO system.
  34
  35 NOTE-END */
  36
  37 /* Define WORDS_BIG_ENDIAN if 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
  45 #define NO_ARG_ARRAY
  46
  47 /* crt0.c, if it is used, should use the i386-bsd style of entry.
  48    with no extra dummy args.  On USG and XENIX,
  49    NO_REMAP says this isn't used. */
  50
  51 #define CRT0_DUMMIES bogus_fp,
  52
  53 #ifdef SOLARIS2
  54 /* Data type of load average, as read out of kmem.  */
  55 #define LOAD_AVE_TYPE long
  56
  57 /* Convert that into an integer that is 100 for a load average of 1.0  */
  58 /* This is totally uncalibrated. */
  59 #define LOAD_AVE_CVT(x) ((int) (((double) (x)) * 100.0 / FSCALE))
  60
  61 /* J.W.Hawtin@lut.ac.uk say Solaris 2.4 as well as Solaris 2.1 on X86
  62    requires -lkvm as well.
  63    And handa@etl.gov.jp says that -lkvm needs -llelf, at least on 2.5.  */
  64 #define LIBS_MACHINE -lkvm -lelf
  65
  66 /* configure thinks solaris X86 has gethostname, but it does not work,
  67    so undefine it.  */
  68 #undef HAVE_GETHOSTNAME
  69
  70 #else /* not SOLARIS2 */
  71 #ifdef USG5_4 /* Older USG systems do not support the load average.  */
  72 /* Data type of load average, as read out of kmem.  */
  73
  74 #define LOAD_AVE_TYPE long
  75
  76 /* Convert that into an integer that is 100 for a load average of 1.0  */
  77 /* This is totally uncalibrated. */
  78
  79 #define LOAD_AVE_CVT(x) ((int) (((double) (x)) * 100.0 / FSCALE))
  80 #define FSCALE 256.0
  81 #endif /* USG5_4 */
  82 #endif /* not SOLARIS2 */
  83
  84 #ifdef USG
  85 #define TEXT_START 0
  86 #endif /* USG */
  87
  88 #ifdef MSDOS
  89 #define NO_REMAP
  90 #endif
  91
  92 #ifdef WINDOWSNT
  93 #define VIRT_ADDR_VARIES
  94 #define DATA_START      get_data_start ()
  95 #define NO_ARG_ARRAY
  96 #endif
  97
  98 #ifdef GNU_LINUX
  99 /* libc-linux/sysdeps/linux/i386/ulimit.c says that due to shared library, */
 100 /* we cannot get the maximum address for brk */
 101 #define ULIMIT_BREAK_VALUE (32*1024*1024)
 102
 103 #define SEGMENT_MASK ((SEGMENT_SIZE)-1)
 104 #endif
 105
 106 /* arch-tag: 746338f0-cb7b-4f49-a98c-cb50817cf2ec
 107    (do not change this comment) */