1 /* machine description file for vax.
2 Copyright (C) 1985, 1986 Free Software Foundation, Inc.
4 This file is part of GNU Emacs.
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)
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.
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, 675 Mass Ave, Cambridge, MA 02139, USA. */
21 /* The following line tells the configuration script what sort of
22 operating system this machine is likely to run.
26 The vax (-machine=vax) runs zillions of different operating systems.
28 Vax running Berkeley Unix (-opsystem=bsd4-1, -opsystem=bsd4-2 or
33 Vax running Ultrix (-opsystem=bsd4-2)
35 Works. See under Ultrix in share-lib/MACHINES for problems using X
38 Vax running System V rel 2 (-opsystem=usg5-2)
42 Vax running System V rel 0 (-opsystem=usg5-0)
46 Vax running VMS (-opsystem=vms)
48 18.36 believed to work. Addition of features is necessary to make
49 this Emacs version more usable.
53 /* The following three symbols give information on
54 the size of various data types. */
56 #define SHORTBITS 16 /* Number of bits in a short */
58 #define INTBITS 32 /* Number of bits in an int */
60 #define LONGBITS 32 /* Number of bits in a long */
62 /* Vax is not big-endian: lowest numbered byte is least significant. */
64 /* #undef BIG_ENDIAN */
66 /* #define vax -- appears to be done automatically */
68 /* Use type int rather than a union, to represent Lisp_Object */
72 /* crt0.c should use the vax-bsd style of entry, with no dummy args. */
76 /* crt0.c should define a symbol `start' and do .globl with a dot. */
78 #define DOT_GLOBAL_START
81 /* USG systems I know of running on Vaxes do not actually
82 support the load average, so disable it for them. */
84 /* Data type of load average, as read out of kmem. */
86 #define LOAD_AVE_TYPE double
88 /* Convert that into an integer that is 100 for a load average of 1.0 */
90 #define LOAD_AVE_CVT(x) ((int) ((x) * 100.0))
96 /* Data type of load average, as read out of driver. */
98 #define LOAD_AVE_TYPE float
100 /* Convert that into an integer that is 100 for a load average of 1.0 */
102 #define LOAD_AVE_CVT(x) ((int) ((x) * 100.0))
106 /* Vax sysV has alloca in the PW library. */
109 #define LIB_STANDARD -lPW -lc
112 /* There is some bug in unexec in for usg 5.2 on a vax
113 which nobody who runs such a system has yet tracked down. */