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1.1 root 1: /* m- 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
9: the Free Software Foundation; either version 1, 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:
22: /* The following three symbols give information on
23: the size of various data types. */
24:
25: #define SHORTBITS 16 /* Number of bits in a short */
26:
27: #define INTBITS 32 /* Number of bits in an int */
28:
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: /* ns16000 is not big-endian: lowest numbered byte is least significant. */
34: #undef 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: /* ns16000 call sequence used on mg1 means that &arg = the args as an array */
39: #undef 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: /* ns16000 addresses are byte addresses */
44: #undef 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: 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 m-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 m-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 m-sequent.h */
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