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20c428fd JB |
1 | /* machine description file for Whitechapel Computer Works MG1 (ns16000 based). |
2 | Copyright (C) 1985 Free Software Foundation, Inc. | |
3 | MG-1 version by L.M.McLoughlin | |
4 | ||
5 | This file is part of GNU Emacs. | |
6 | ||
7 | GNU Emacs is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
17385adc | 9 | the Free Software Foundation; either version 2, or (at your option) |
20c428fd JB |
10 | any later version. |
11 | ||
12 | GNU Emacs is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with GNU Emacs; see the file COPYING. If not, write to | |
3b7ad313 EN |
19 | the Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
20 | Boston, MA 02111-1307, USA. */ | |
20c428fd JB |
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 | ||
27 | NOTE-START | |
28 | We are in the dark about what operating system runs on the Whitechapel | |
29 | systems. Consult share-lib/MACHINES for information on which | |
30 | operating systems Emacs has already been ported to; one of them might | |
31 | work. If you find an existing system name that works or write your | |
32 | own configuration files, please let the Free Software Foundation in on | |
33 | your work; we'd like to distribute this information. | |
34 | NOTE-END */ | |
35 | ||
74d3f806 KH |
36 | /* Define WORDS_BIG_ENDIAN iff lowest-numbered byte in a word |
37 | is the most significant byte. */ | |
38 | ||
39 | #undef WORDS_BIG_ENDIAN | |
40 | ||
20c428fd JB |
41 | /* Define NO_ARG_ARRAY if you cannot take the address of the first of a |
42 | * group of arguments and treat it as an array of the arguments. */ | |
43 | /* ns16000 call sequence used on mg1 means that &arg = the args as an array */ | |
44 | #undef NO_ARG_ARRAY | |
45 | ||
46 | /* Define WORD_MACHINE if addresses and such have | |
47 | * to be corrected before they can be used as byte counts. */ | |
48 | /* ns16000 addresses are byte addresses */ | |
49 | #undef WORD_MACHINE | |
50 | ||
20c428fd JB |
51 | /* Now define a symbol for the cpu type, if your compiler |
52 | does not define it automatically: | |
53 | vax, m68000, ns16000, pyramid, orion, tahoe and APOLLO | |
54 | are the ones defined so far. */ | |
55 | /* Say this machine is a 16000 and an mg1, cpp says its a 32000 */ | |
56 | #define ns16000 | |
57 | #define mg1 | |
58 | ||
59 | /* Use type int rather than a union, to represent Lisp_Object */ | |
60 | /* This is desirable for most machines. */ | |
61 | /* Not sure on mg-1 but this shouldn't hurt! */ | |
62 | #define NO_UNION_TYPE | |
63 | ||
64 | /* Define EXPLICIT_SIGN_EXTEND if XINT must explicitly sign-extend | |
65 | the 24-bit bit field into an int. In other words, if bit fields | |
66 | are always unsigned. | |
67 | ||
68 | If you use NO_UNION_TYPE, this flag does not matter. */ | |
69 | ||
70 | #define EXPLICIT_SIGN_EXTEND | |
71 | ||
72 | /* Data type of load average, as read out of kmem. */ | |
73 | /* mg1 its an unsigned long */ | |
74 | #define LOAD_AVE_TYPE unsigned long | |
75 | ||
76 | /* Convert that into an integer that is 100 for a load average of 1.0 */ | |
77 | #define FSCALE 1000.0 | |
78 | #define LOAD_AVE_CVT(x) (int) (((double) (x)) * 100.0 / FSCALE) | |
79 | ||
80 | /* Define CANNOT_DUMP on machines where unexec does not work. | |
81 | Then the function dump-emacs will not be defined | |
82 | and temacs will do (load "loadup") automatically unless told otherwise. */ | |
83 | /* ns16000's have an unexec, so should the mg-1 */ | |
84 | #undef CANNOT_DUMP | |
85 | ||
86 | /* Define VIRT_ADDR_VARIES if the virtual addresses of | |
87 | pure and impure space as loaded can vary, and even their | |
88 | relative order cannot be relied on. | |
89 | ||
90 | Otherwise Emacs assumes that text space precedes data space, | |
91 | numerically. */ | |
92 | /* hmmmm... not sure. copied sequent.h */ | |
93 | #undef VIRT_ADDR_VARIES | |
94 | ||
95 | /* Define C_ALLOCA if this machine does not support a true alloca | |
96 | and the one written in C should be used instead. | |
97 | Define HAVE_ALLOCA to say that the system provides a properly | |
98 | working alloca function and it should be used. | |
99 | Define neither one if an assembler-language alloca | |
100 | in the file alloca.s should be used. */ | |
101 | /* hmmmm... again not sure. so copied sequent.h again! */ | |
102 | #undef C_ALLOCA | |
103 | #undef HAVE_ALLOCA | |
104 | ||
105 | /* Define NO_REMAP if memory segmentation makes it not work well | |
106 | to change the boundary between the text section and data section | |
107 | when Emacs is dumped. If you define this, the preloaded Lisp | |
108 | code will not be sharable; but that's better than failing completely. */ | |
109 | /* mapping seems screwy */ | |
110 | #define NO_REMAP | |
111 | ||
112 | /* Avoids a compiler bug */ | |
113 | /* borrowed from sequent.h */ |