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/* machine description file for ISI 68000's
Copyright (C) 1985, 1986 Free Software Foundation, Inc.
This file is part of GNU Emacs.
GNU Emacs is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Emacs; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
/* The following line tells the configuration script what sort of
operating system this machine is likely to run.
USUAL-OPSYS="note"
NOTE-START
Use `-opsystem=bsd4-2' or `-opsystem=bsd4-3'.
NOTE-END */
#define ISI68K
/* Define WORDS_BIG_ENDIAN iff lowest-numbered byte in a word
is the most significant byte. */
#define WORDS_BIG_ENDIAN
/* Say this machine is a 68000 */
#define m68000
/* Use type int rather than a union, to represent Lisp_Object */
#define NO_UNION_TYPE
/* XINT must explicitly sign-extend */
#define EXPLICIT_SIGN_EXTEND
/* Data type of load average, as read out of kmem. */
#ifdef BSD4_3
#define LOAD_AVE_TYPE long
#else
#define LOAD_AVE_TYPE double
#endif BSD4_3
/* Convert that into an integer that is 100 for a load average of 1.0 */
#ifdef BSD4_3
#define LOAD_AVE_CVT(x) (int) (((double) (x)) * 100.0 / FSCALE)
#else
#define LOAD_AVE_CVT(x) ((int) ((x) * 100.0))
#endif
/* Mask for address bits within a memory segment */
#define SEGMENT_MASK 0x1ffff
/* use the -20 switch to get the 68020 code */
/* #define C_SWITCH_MACHINE -20 */
/* Use the version of the library for the 68020
because the standard library requires some special hacks in crt0
which the GNU crt0 does not have. */
#define LIB_STANDARD -lmc
/* macros to make unexec work right */
#define A_TEXT_OFFSET(HDR) sizeof(HDR)
#define A_TEXT_SEEK(HDR) sizeof(HDR)
/* A few changes for the newer systems. */
#ifdef BSD4_3
#define HAVE_ALLOCA
/* The following line affects crt0.c. */
#undef m68k
#undef LIB_STANDARD
#define LIB_STANDARD -lmc -lc
#define C_DEBUG_SWITCH -20 -O -X23
#endif
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