src/m/ibmrt.h

   1 /* RTPC machine dependent defines
   2    Copyright (C) 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="bsd4-2"  */
  24
  25 /* Define WORDS_BIG_ENDIAN iff lowest-numbered byte in a word
  26    is the most significant byte.  */
  27
  28 #define WORDS_BIG_ENDIAN
  29
  30 /* Define NO_ARG_ARRAY if you cannot take the address of the first of a
  31  * group of arguments and treat it as an array of the arguments.  */
  32
  33 #define NO_ARG_ARRAY
  34
  35 /* Define WORD_MACHINE if addresses and such have
  36  * to be corrected before they can be used as byte counts.  */
  37
  38 #define WORD_MACHINE
  39
  40 /* Now define a symbol for the cpu type, if your compiler
  41    does not define it automatically.  */
  42
  43 #define ibmrt
  44 #define romp /* unfortunately old include files are hanging around.  */
  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 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 double    /* For AIS (sysV) */
  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)
  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 #undef 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 HAVE_ALLOCA
  90 \f
  91 /* The data segment in this machine starts at a fixed address.
  92    An address of data cannot be stored correctly in a Lisp object;
  93    we always lose the high bits.  We must tell XPNTR to add them back.  */
  94
  95 #define DATA_SEG_BITS 0x10000000
  96 #define DATA_START    0x10000000
  97
  98 /* The text segment always starts at a fixed address.
  99    This way we don't need to have a label _start defined.  */
 100 #define TEXT_START 0
 101
 102 /* Taking a pointer to a char casting it as int pointer */
 103 /* and then taking the int which the int pointer points to */
 104 /* is practically guaranteed to give erroneous results */
 105
 106 #define NEED_ERRNO
 107
 108 #define SKTPAIR
 109
 110 /* BSD has BSTRING.  */
 111
 112 #define BSTRING
 113
 114 /* Special switches to give the C compiler.  */
 115
 116 #ifndef __GNUC__
 117 #define C_SWITCH_MACHINE -Dalloca=_Alloca
 118 #endif
 119
 120 /* Don't attempt to relabel some of the data as text when dumping.
 121    It does not work because their virtual addresses are not consecutive.
 122    This enables us to use the standard crt0.o.  */
 123
 124 #define NO_REMAP
 125
 126 /* Use the bitmap files that come with Emacs.  */
 127 #define EMACS_BITMAP_FILES