1/* machine description file for ISI 68000's
2   Copyright (C) 1985, 1986, 2001, 2002, 2003, 2004,
3                 2005, 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
28Use `-opsystem=bsd4-2' or `-opsystem=bsd4-3'.
29NOTE-END */
30
31#define ISI68K
32
33/* Define WORDS_BIG_ENDIAN iff lowest-numbered byte in a word
34   is the most significant byte.  */
35
36#define WORDS_BIG_ENDIAN
37
38/* Say this machine is a 68000 */
39
40#define m68000
41
42/* Use type int rather than a union, to represent Lisp_Object */
43
44#define NO_UNION_TYPE
45
46/* XINT must explicitly sign-extend */
47
48#define EXPLICIT_SIGN_EXTEND
49
50/* Data type of load average, as read out of kmem.  */
51
52#ifdef BSD4_3
53#define LOAD_AVE_TYPE long
54#else
55#define LOAD_AVE_TYPE double
56#endif BSD4_3
57
58/* Convert that into an integer that is 100 for a load average of 1.0  */
59
60#ifdef BSD4_3
61#define LOAD_AVE_CVT(x) (int) (((double) (x)) * 100.0 / FSCALE)
62#else
63#define LOAD_AVE_CVT(x) ((int) ((x) * 100.0))
64#endif
65
66/* Mask for address bits within a memory segment */
67
68#define SEGMENT_MASK 0x1ffff
69
70/* use the -20 switch to get the 68020 code */
71/* #define C_SWITCH_MACHINE -20 */
72
73/* Use the version of the library for the 68020
74   because the standard library requires some special hacks in crt0
75   which the GNU crt0 does not have.  */
76
77#define LIB_STANDARD -lmc
78
79/* macros to make unexec work right */
80
81#define A_TEXT_OFFSET(HDR) sizeof(HDR)
82#define A_TEXT_SEEK(HDR) sizeof(HDR)
83
84/* A few changes for the newer systems.  */
85
86#ifdef BSD4_3
87/* The following line affects crt0.c.  */
88#undef m68k
89
90#undef LIB_STANDARD
91#define LIB_STANDARD -lmc -lc
92#define C_DEBUG_SWITCH -20 -O -X23
93#endif
94
95/* arch-tag: 3bfb5a11-d94e-4372-923b-9f47d0851f42
96   (do not change this comment) */
97