1/* Machine description file for intel 386.
2   Copyright (C) 1987, 2001, 2002, 2003, 2004, 2005,
3                 2006, 2007  Free Software Foundation, Inc.
4
5This file is part of GNU Emacs.
6
7GNU Emacs is free software; you can redistribute it and/or modify
8it under the terms of the GNU General Public License as published by
9the Free Software Foundation; either version 2, or (at your option)
10any later version.
11
12GNU Emacs is distributed in the hope that it will be useful,
13but WITHOUT ANY WARRANTY; without even the implied warranty of
14MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15GNU General Public License for more details.
16
17You should have received a copy of the GNU General Public License
18along with GNU Emacs; see the file COPYING.  If not, write to
19the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
20Boston, MA 02110-1301, USA.  */
21
22
23/* The following line tells the configuration script what sort of
24   operating system this machine is likely to run.
25   USUAL-OPSYS="note"
26
27NOTE-START
28Intel 386 (-machine=intel386 or -machine=is386.h)
29
30  The possibilities for -opsystem are: bsd4-2, usg5-2-2, usg5-3,
31  isc2-2, 386-ix, esix, linux, sco3.2v4, and xenix.
32
33  18.58 should support a wide variety of operating systems.
34  Use isc2-2 for Interactive 386/ix version 2.2.
35  Use 386ix for prior versions.
36  Use esix for Esix.
37  Use linux for Linux.
38  It isn't clear what to do on an SCO system.
39
40  -machine=is386 is used for an Integrated Solutions 386 machine.
41  It may also be correct for Microport systems.
42
43Cubix QBx/386 (-machine=intel386 -opsystem=usg5-3)
44
45  Changes merged in 19.1.  Systems before 2/A/0 may fail to compile etags.c
46  due to a compiler bug.
47
48Prime EXL (-machine=intel386 -opsystem=usg5-3)
49
50  Minor changes merged in 19.1.
51NOTE-END */
52
53/* Define WORDS_BIG_ENDIAN iff lowest-numbered byte in a word
54   is the most significant byte.  */
55
56#undef WORDS_BIG_ENDIAN
57
58/* Define NO_ARG_ARRAY if you cannot take the address of the first of a
59 * group of arguments and treat it as an array of the arguments.  */
60
61/* #define NO_ARG_ARRAY */
62
63/* Define WORD_MACHINE if addresses and such have
64 * to be corrected before they can be used as byte counts.  */
65
66/* #define WORD_MACHINE */
67
68/* Now define a symbol for the cpu type, if your compiler
69   does not define it automatically:
70   Ones defined so far include vax, m68000, ns16000, pyramid,
71   orion, tahoe, APOLLO and many others */
72
73#define INTEL386
74
75/* Use type int rather than a union, to represent Lisp_Object */
76
77#define NO_UNION_TYPE
78
79/* crt0.c, if it is used, should use the i386-bsd style of entry.
80   with no extra dummy args.  On USG and XENIX,
81   NO_REMAP says this isn't used. */
82
83#define CRT0_DUMMIES bogus_fp,
84
85/* crt0.c should define a symbol `start' and do .globl with a dot.  */
86
87#define DOT_GLOBAL_START
88
89#ifdef XENIX
90/* Data type of load average, as read out of kmem.  */
91#define LOAD_AVE_TYPE short
92
93/* Convert that into an integer that is 100 for a load average of 1.0  */
94#define LOAD_AVE_CVT(x) (((double) (x)) * 100.0 / FSCALE)
95
96#define FSCALE 256.0         /* determined by experimentation...  */
97#endif
98
99
100#ifdef SOLARIS2
101/* Data type of load average, as read out of kmem.  */
102#define LOAD_AVE_TYPE long
103
104/* Convert that into an integer that is 100 for a load average of 1.0  */
105/* This is totally uncalibrated. */
106#define LOAD_AVE_CVT(x) ((int) (((double) (x)) * 100.0 / FSCALE))
107
108/* J.W.Hawtin@lut.ac.uk say Solaris 2.4 as well as Solaris 2.1 on X86
109   requires -lkvm as well.
110   And handa@etl.gov.jp says that -lkvm needs -llelf, at least on 2.5.  */
111#define LIBS_MACHINE -lkvm -lelf
112
113#ifndef SOLARIS2_4
114/* J.W.hawtin@lut.ac.uk says Solaris 2.1 on the X86 has FSCALE defined in a
115   system header. */
116#else /* SOLARIS2_4 */
117#ifndef __GNUC__
118#if 0 /* wisner@gryphon.com says this screws up cpp */
119#define C_SWITCH_MACHINE -Xa
120#endif
121#endif /* not __GNUC__ */
122#endif /* SOLARIS2_4 */
123
124/* configure thinks solaris X86 has gethostname, but it does not work,
125   so undefine it.  */
126#undef HAVE_GETHOSTNAME
127
128#else /* not SOLARIS2 */
129#ifdef USG5_4 /* Older USG systems do not support the load average.  */
130/* Data type of load average, as read out of kmem.  */
131
132#define LOAD_AVE_TYPE long
133
134/* Convert that into an integer that is 100 for a load average of 1.0  */
135/* This is totally uncalibrated. */
136
137#define LOAD_AVE_CVT(x) ((int) (((double) (x)) * 100.0 / FSCALE))
138#define FSCALE 256.0
139#endif
140#endif /* not SOLARIS2 */
141
142/* Define CANNOT_DUMP on machines where unexec does not work.
143   Then the function dump-emacs will not be defined
144   and temacs will do (load "loadup") automatically unless told otherwise.  */
145
146/* #define CANNOT_DUMP */
147
148/* Define VIRT_ADDR_VARIES if the virtual addresses of
149   pure and impure space as loaded can vary, and even their
150   relative order cannot be relied on.
151
152   Otherwise Emacs assumes that text space precedes data space,
153   numerically.  */
154
155/* #define VIRT_ADDR_VARIES */
156
157#ifdef XENIX
158/* Define NO_REMAP if memory segmentation makes it not work well
159   to change the boundary between the text section and data section
160   when Emacs is dumped.  If you define this, the preloaded Lisp
161   code will not be sharable; but that's better than failing completely.  */
162
163#define NO_REMAP
164
165/* Since cannot purify, use standard Xenix 386 startup code. */
166
167#define START_FILES	/lib/386/Sseg.o pre-crt0.o /lib/386/Scrt0.o
168
169/* These really use terminfo.  */
170
171#define LIBS_TERMCAP /lib/386/Slibcurses.a  \
172   /lib/386/Slibtinfo.a /lib/386/Slibx.a
173
174/* Standard libraries for this machine.  Since `-l' doesn't work in `ld'.  */
175/* '__fltused' is unresolved w/o Slibcfp.a */
176#define LIB_STANDARD /lib/386/Slibcfp.a /lib/386/Slibc.a
177#else /* not XENIX */
178
179/* this brings in alloca() if we're using cc */
180#ifdef USG
181#ifndef LIB_STANDARD
182#ifdef USG5_4
183#define LIB_STANDARD -lc
184#else /* not USG5_4 */
185#define LIB_STANDARD -lPW -lc
186#endif /* not USG5_4 */
187#endif /* LIB_STANDARD */
188
189#define NO_REMAP
190#define TEXT_START 0
191#endif /* USG */
192#endif /* not XENIX */
193
194#ifdef USG5_4
195#define DATA_SEG_BITS 0x08000000
196#endif
197
198#ifdef MSDOS
199#define NO_REMAP
200#endif
201
202#ifdef WINDOWSNT
203#define VIRT_ADDR_VARIES
204#define DATA_END 	get_data_end ()
205#define DATA_START 	get_data_start ()
206#define NO_ARG_ARRAY
207#endif
208
209#ifdef linux
210/* libc-linux/sysdeps/linux/i386/ulimit.c says that due to shared library, */
211/* we cannot get the maximum address for brk */
212#define ULIMIT_BREAK_VALUE (32*1024*1024)
213
214#define SEGMENT_MASK ((SEGMENT_SIZE)-1)
215#endif
216
217/* arch-tag: 746338f0-cb7b-4f49-a98c-cb50817cf2ec
218   (do not change this comment) */
219