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17385adc JB |
1 | /* machine description file for i860. |
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 | |
8 | the Free Software Foundation; either version 2, or (at your option) | |
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 | |
18 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
19 | ||
20 | ||
21 | /* The following line tells the configuration script what sort of | |
22 | operating system this machine is likely to run. | |
23 | USUAL-OPSYS="<name of system .h file here, without the s- or .h>" */ | |
24 | ||
25 | /* The following three symbols give information on | |
26 | the size of various data types. */ | |
27 | ||
28 | #define SHORTBITS 16 /* Number of bits in a short */ | |
29 | ||
30 | #define INTBITS 32 /* Number of bits in an int */ | |
31 | ||
32 | #define LONGBITS 32 /* Number of bits in a long */ | |
33 | ||
34 | /* Define BIG_ENDIAN iff lowest-numbered byte in a word | |
35 | is the most significant byte. */ | |
36 | ||
37 | /* i860 is not big-endian: lowest numbered byte is least significant. */ | |
38 | ||
39 | #undef BIG_ENDIAN | |
40 | ||
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 | ||
44 | #define 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 | ||
49 | /* #define WORD_MACHINE */ | |
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 INTEL860 | |
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 C_ALLOCA | |
102 | /* #define HAVE_ALLOCA */ | |
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 |