Commit | Line | Data |
---|---|---|
1b94449f RS |
1 | /* Machine description file for MS-DOS |
2 | ||
3 | Copyright (C) 1993 Free Software Foundation, Inc. | |
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 | |
9 | the Free Software Foundation; either version 2, or (at your option) | |
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 | |
19 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
20 | ||
21 | /* Note: lots of stuff here was taken from m-dos386.h in demacs. */ | |
22 | ||
23 | ||
24 | /* The following three symbols give information on | |
25 | the size of various data types. */ | |
26 | ||
27 | #define SHORTBITS 16 /* Number of bits in a short */ | |
28 | #define INTBITS 32 /* Number of bits in an int */ | |
29 | #define LONGBITS 32 /* Number of bits in a long */ | |
30 | ||
31 | /* Define BIG_ENDIAN iff lowest-numbered byte in a word | |
32 | is the most significant byte. */ | |
33 | ||
34 | /* #define BIG_ENDIAN */ | |
35 | ||
36 | /* Define NO_ARG_ARRAY if you cannot take the address of the first of a | |
37 | * group of arguments and treat it as an array of the arguments. */ | |
38 | ||
39 | /* #define NO_ARG_ARRAY */ | |
40 | ||
41 | /* Define WORD_MACHINE if addresses and such have | |
42 | * to be corrected before they can be used as byte counts. */ | |
43 | ||
44 | /* #define WORD_MACHINE */ | |
45 | ||
46 | /* Define how to take a char and sign-extend into an int. | |
47 | On machines where char is signed, this is a no-op. */ | |
48 | ||
49 | #define SIGN_EXTEND_CHAR(c) (c) | |
50 | ||
51 | /* Now define a symbol for the cpu type, if your compiler | |
52 | does not define it automatically: | |
53 | Ones defined so far include vax, m68000, ns16000, pyramid, | |
54 | orion, tahoe, APOLLO and many others */ | |
55 | ||
56 | #define INTEL386 | |
57 | ||
58 | /* Use type int rather than a union, to represent Lisp_Object */ | |
59 | /* This is desirable for most machines. */ | |
60 | ||
61 | #define NO_UNION_TYPE | |
62 | ||
63 | /* Define EXPLICIT_SIGN_EXTEND if XINT must explicitly sign-extend | |
64 | the 24-bit bit field into an int. In other words, if bit fields | |
65 | are always unsigned. | |
66 | ||
67 | If you use NO_UNION_TYPE, this flag does not matter. */ | |
68 | ||
69 | #define EXPLICIT_SIGN_EXTEND | |
70 | ||
71 | /* Data type of load average, as read out of kmem. */ | |
72 | ||
73 | /* #define LOAD_AVE_TYPE long */ | |
74 | ||
75 | /* Convert that into an integer that is 100 for a load average of 1.0 */ | |
76 | ||
77 | /* #define LOAD_AVE_CVT(x) (int) (((double) (x)) * 100.0 / FSCALE) */ | |
78 | ||
79 | /* Define CANNOT_DUMP on machines where unexec does not work. | |
80 | Then the function dump-emacs will not be defined | |
81 | and temacs will do (load "loadup") automatically unless told otherwise. */ | |
82 | ||
83 | /* #define CANNOT_DUMP */ | |
84 | ||
85 | /* Define VIRT_ADDR_VARIES if the virtual addresses of | |
86 | pure and impure space as loaded can vary, and even their | |
87 | relative order cannot be relied on. | |
88 | ||
89 | Otherwise Emacs assumes that text space precedes data space, | |
90 | numerically. */ | |
91 | ||
92 | /* #define VIRT_ADDR_VARIES */ | |
93 | ||
94 | /* Define C_ALLOCA if this machine does not support a true alloca | |
95 | and the one written in C should be used instead. | |
96 | Define HAVE_ALLOCA to say that the system provides a properly | |
97 | working alloca function and it should be used. | |
98 | Define neither one if an assembler-language alloca | |
99 | in the file alloca.s should be used. */ | |
100 | ||
101 | #define HAVE_ALLOCA | |
102 | #define alloca(x) __builtin_alloca(x) | |
103 | ||
104 | /* Define NO_REMAP if memory segmentation makes it not work well | |
105 | to change the boundary between the text section and data section | |
106 | when Emacs is dumped. If you define this, the preloaded Lisp | |
107 | code will not be sharable; but that's better than failing completely. */ | |
108 | ||
109 | #define NO_REMAP | |
110 | ||
111 | /* We need a little extra space, see ../../lisp/loadup.el */ | |
389c907c RS |
112 | #define PURESIZE 220000 |
113 | ||
114 | /* We have (the code to control) a mouse. */ | |
115 | #define HAVE_MOUSE |