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20c428fd JB |
1 | /* machine description file template. |
2 | Copyright (C) 1985, 1986 Free Software Foundation, Inc. | |
3 | ||
4 | This file is part of GNU Emacs. | |
5 | ||
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 | |
17385adc | 8 | the Free Software Foundation; either version 2, or (at your option) |
20c428fd JB |
9 | any later version. |
10 | ||
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. | |
15 | ||
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 | |
3b7ad313 EN |
18 | the Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
19 | Boston, MA 02111-1307, USA. */ | |
20c428fd JB |
20 | |
21 | ||
22 | /* The following line tells the configuration script what sort of | |
23 | operating system this machine is likely to run. | |
24 | USUAL-OPSYS="<name of system .h file here, without the s- or .h>" */ | |
25 | ||
74d3f806 KH |
26 | /* Define WORDS_BIG_ENDIAN iff lowest-numbered byte in a word |
27 | is the most significant byte. */ | |
28 | ||
29 | #define WORDS_BIG_ENDIAN | |
30 | ||
20c428fd JB |
31 | /* Define NO_ARG_ARRAY if you cannot take the address of the first of a |
32 | * group of arguments and treat it as an array of the arguments. */ | |
33 | ||
34 | #define NO_ARG_ARRAY | |
35 | ||
36 | /* Define WORD_MACHINE if addresses and such have | |
37 | * to be corrected before they can be used as byte counts. */ | |
38 | ||
39 | #define WORD_MACHINE | |
40 | ||
20c428fd JB |
41 | /* Now define a symbol for the cpu type, if your compiler |
42 | does not define it automatically: | |
43 | Ones defined so far include vax, m68000, ns16000, pyramid, | |
44 | orion, tahoe, APOLLO and many others */ | |
45 | ||
46 | /* Use type int rather than a union, to represent Lisp_Object */ | |
47 | /* This is desirable for most machines. */ | |
48 | ||
49 | #define NO_UNION_TYPE | |
50 | ||
51 | /* Define EXPLICIT_SIGN_EXTEND if XINT must explicitly sign-extend | |
52 | the 24-bit bit field into an int. In other words, if bit fields | |
53 | are always unsigned. | |
54 | ||
55 | If you use NO_UNION_TYPE, this flag does not matter. */ | |
56 | ||
57 | #define EXPLICIT_SIGN_EXTEND | |
58 | ||
59 | /* Data type of load average, as read out of kmem. */ | |
60 | ||
61 | #define LOAD_AVE_TYPE long | |
62 | ||
63 | /* Convert that into an integer that is 100 for a load average of 1.0 */ | |
64 | ||
65 | #define LOAD_AVE_CVT(x) (int) (((double) (x)) * 100.0 / FSCALE) | |
66 | ||
67 | /* Define CANNOT_DUMP on machines where unexec does not work. | |
68 | Then the function dump-emacs will not be defined | |
69 | and temacs will do (load "loadup") automatically unless told otherwise. */ | |
70 | ||
71 | #define CANNOT_DUMP | |
72 | ||
73 | /* Define VIRT_ADDR_VARIES if the virtual addresses of | |
74 | pure and impure space as loaded can vary, and even their | |
75 | relative order cannot be relied on. | |
76 | ||
77 | Otherwise Emacs assumes that text space precedes data space, | |
78 | numerically. */ | |
79 | ||
80 | #define VIRT_ADDR_VARIES | |
81 | ||
82 | /* Define C_ALLOCA if this machine does not support a true alloca | |
83 | and the one written in C should be used instead. | |
84 | Define HAVE_ALLOCA to say that the system provides a properly | |
85 | working alloca function and it should be used. | |
86 | Define neither one if an assembler-language alloca | |
87 | in the file alloca.s should be used. */ | |
88 | ||
89 | #define C_ALLOCA | |
90 | #define HAVE_ALLOCA | |
91 | ||
92 | /* Define NO_REMAP if memory segmentation makes it not work well | |
93 | to change the boundary between the text section and data section | |
94 | when Emacs is dumped. If you define this, the preloaded Lisp | |
95 | code will not be sharable; but that's better than failing completely. */ | |
96 | ||
97 | #define NO_REMAP | |
0c29c32c JB |
98 | |
99 | /* Some really obscure 4.2-based systems (like Sequent DYNIX) | |
100 | * do not support asynchronous I/O (using SIGIO) on sockets, | |
101 | * even though it works fine on tty's. If you have one of | |
102 | * these systems, define the following, and then use it in | |
103 | * config.h (or elsewhere) to decide when (not) to use SIGIO. | |
104 | * | |
105 | * You'd think this would go in an operating-system description file, | |
106 | * but since it only occurs on some, but not all, BSD systems, the | |
107 | * reasonable place to select for it is in the machine description | |
108 | * file. | |
109 | */ | |
110 | ||
111 | #define NO_SOCK_SIGIO | |
00b1a5fb | 112 | |
a753b637 | 113 | |
00b1a5fb JB |
114 | /* After adding support for a new system, modify the large case |
115 | statement in the `configure' script to recognize reasonable | |
116 | configuration names, and add a description of the system to | |
117 | `etc/MACHINES'. | |
118 | ||
119 | If you've just fixed a problem in an existing configuration file, | |
120 | you should also check `etc/MACHINES' to make sure its descriptions | |
121 | of known problems in that configuration should be updated. */ |