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, Inc., 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  20
  21
  22 /* The following line tells the configuration script what sort of
  23    operating system this machine is likely to run.
  24    USUAL-OPSYS="bsd4-2"  */
  25
  26 /* Define WORDS_BIG_ENDIAN iff lowest-numbered byte in a word
  27    is the most significant byte.  */
  28
  29 #define WORDS_BIG_ENDIAN
  30
  31 /* Define NO_ARG_ARRAY if you cannot take the address of the first of a
  32  * group of arguments and treat it as an array of the arguments.  */
  33
  34 #define NO_ARG_ARRAY
  35
  36 /* Define WORD_MACHINE if addresses and such have
  37  * to be corrected before they can be used as byte counts.  */
  38
  39 #define WORD_MACHINE
  40
  41 /* Now define a symbol for the cpu type, if your compiler
  42    does not define it automatically.  */
  43
  44 #define ibmrt
  45 #define romp /* unfortunately old include files are hanging around.  */
  46
  47 /* Use type int rather than a union, to represent Lisp_Object */
  48 /* This is desirable for most machines.  */
  49
  50 #define NO_UNION_TYPE
  51
  52 /* Define EXPLICIT_SIGN_EXTEND if XINT must explicitly sign-extend
  53    the bit field into an int.  In other words, if bit fields
  54    are always unsigned.
  55
  56    If you use NO_UNION_TYPE, this flag does not matter.  */
  57
  58 #define EXPLICIT_SIGN_EXTEND
  59
  60 /* Data type of load average, as read out of kmem.  */
  61
  62 #define LOAD_AVE_TYPE double    /* For AIS (sysV) */
  63
  64 /* Convert that into an integer that is 100 for a load average of 1.0  */
  65
  66 #define LOAD_AVE_CVT(x) (int) (((double) (x)) * 100.0)
  67
  68 /* Define CANNOT_DUMP on machines where unexec does not work.
  69    Then the function dump-emacs will not be defined
  70    and temacs will do (load "loadup") automatically unless told otherwise.  */
  71
  72 /* #define CANNOT_DUMP */
  73
  74 /* Define VIRT_ADDR_VARIES if the virtual addresses of
  75    pure and impure space as loaded can vary, and even their
  76    relative order cannot be relied on.
  77
  78    Otherwise Emacs assumes that text space precedes data space,
  79    numerically.  */
  80
  81 #undef VIRT_ADDR_VARIES
  82
  83 /* Define C_ALLOCA if this machine does not support a true alloca
  84    and the one written in C should be used instead.
  85    Define HAVE_ALLOCA to say that the system provides a properly
  86    working alloca function and it should be used.
  87    Define neither one if an assembler-language alloca
  88    in the file alloca.s should be used.  */
  89
  90 #define HAVE_ALLOCA
  91 \f
  92 /* The data segment in this machine starts at a fixed address.
  93    An address of data cannot be stored correctly in a Lisp object;
  94    we always lose the high bits.  We must tell XPNTR to add them back.  */
  95
  96 #define DATA_SEG_BITS 0x10000000
  97 #define DATA_START    0x10000000
  98
  99 /* The text segment always starts at a fixed address.
 100    This way we don't need to have a label _start defined.  */
 101 #define TEXT_START 0
 102
 103 /* Taking a pointer to a char casting it as int pointer */
 104 /* and then taking the int which the int pointer points to */
 105 /* is practically guaranteed to give erroneous results */
 106
 107 #define NEED_ERRNO
 108
 109 #define SKTPAIR
 110
 111 /* BSD has BSTRING.  */
 112
 113 #define BSTRING
 114
 115 /* Special switches to give the C compiler.  */
 116
 117 #ifndef __GNUC__
 118 #define C_SWITCH_MACHINE -Dalloca=_Alloca
 119 #endif
 120
 121 /* Don't attempt to relabel some of the data as text when dumping.
 122    It does not work because their virtual addresses are not consecutive.
 123    This enables us to use the standard crt0.o.  */
 124
 125 #define NO_REMAP
 126
 127 /* Use the bitmap files that come with Emacs.  */
 128 #define EMACS_BITMAP_FILES