1/* machine description file for Elxsi machine (running enix).
2   Copyright (C) 1986, 1992, 2001, 2002, 2003, 2004,
3                 2005, 2006, 2007  Free Software Foundation, Inc.
4   Adapted by John Salmon
5
6This file is part of GNU Emacs.
7
8GNU Emacs is free software; you can redistribute it and/or modify
9it under the terms of the GNU General Public License as published by
10the Free Software Foundation; either version 2, or (at your option)
11any later version.
12
13GNU Emacs is distributed in the hope that it will be useful,
14but WITHOUT ANY WARRANTY; without even the implied warranty of
15MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16GNU General Public License for more details.
17
18You should have received a copy of the GNU General Public License
19along with GNU Emacs; see the file COPYING.  If not, write to
20the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
21Boston, MA 02110-1301, USA.  */
22
23/* The following line tells the configuration script what sort of
24   operating system this machine is likely to run.
25   USUAL-OPSYS="usg5-2"  */
26
27/* This file was modified by Matt Crawford <matt@tank.uchicago.edu>
28   to work under Elxsi's 12.0 release of BSD unix. */
29
30/* Define WORDS_BIG_ENDIAN iff lowest-numbered byte in a word
31   is the most significant byte.  */
32
33#undef WORDS_BIG_ENDIAN
34
35/* Define NO_ARG_ARRAY if you cannot take the address of the first of a
36 * group of arguments and treat it as an array of the arguments.  */
37
38/*#define NO_ARG_ARRAY */
39
40/* Define WORD_MACHINE if addresses and such have
41 * to be corrected before they can be used as byte counts.  */
42
43/*#define WORD_MACHINE */
44
45/* Now define a symbol for the cpu type, if your compiler
46   does not define it automatically:
47   vax, m68000, ns16000, pyramid, orion, tahoe and APOLLO
48   are the ones defined so far.  */
49
50#ifndef elxsi
51#define elxsi
52#endif
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
68/* Name of kernel load average variable */
69
70#undef LDAV_SYMBOL
71#define LDAV_SYMBOL "avenrun"
72
73/* Data type of load average, as read out of kmem.  */
74
75#define LOAD_AVE_TYPE double
76
77/* Convert that into an integer that is 100 for a load average of 1.0  */
78
79#define LOAD_AVE_CVT(x) (int) ((x) * 100.0)
80
81/* Define CANNOT_DUMP on machines where unexec does not work.
82   Then the function dump-emacs will not be defined
83   and temacs will do (load "loadup") automatically unless told otherwise.
84
85   Earlier versions couldn't dump.
86   Changes for 12.0 release are in 19.1.
87   Dumping should work now.  */
88
89/* #define CANNOT_DUMP */
90
91/* Define VIRT_ADDR_VARIES if the virtual addresses of
92   pure and impure space as loaded can vary, and even their
93   relative order cannot be relied on.
94
95   Otherwise Emacs assumes that text space precedes data space,
96   numerically.  */
97
98/* #define VIRT_ADDR_VARIES */
99
100/* Define NO_REMAP if memory segmentation makes it not work well
101   to change the boundary between the text section and data section
102   when Emacs is dumped.  If you define this, the preloaded Lisp
103   code will not be sharable; but that's better than failing completely.  */
104/*#define NO_REMAP*/
105
106/* This is a guess for an alternate solution to whatever
107   problem motivated defining _sobuf in sysdep,c with extern char *_sobuf.  */
108#define _sobuf xsobuf
109
110/* Address of start of text segment as loaded.  */
111
112#define TEXT_START	0x800
113
114/* Tell crt0.c not to define environ.  */
115
116#define DONT_NEED_ENVIRON
117
118/* The elxsi has no debugger, so might as well optimize instead
119   of trying to make a symbol table.  */
120
121#define C_DEBUG_SWITCH -O
122
123/* Elxsi uses COFF under both Sys V and BSD environments */
124
125#define COFF
126
127#define ADJUST_EXEC_HEADER {\
128extern int _init_brk;\
129_init_brk = bss_start;\
130}
131
132/* arch-tag: 73bf1120-a994-4c29-8d60-af425d8bf10c
133   (do not change this comment) */
134