[bpt/emacs.git] / src / m / intel386.h

/* Machine description file for intel 386.
   Copyright (C) 1987 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
Intel 386 (-machine=intel386 or -machine=is386.h)

  The possibilities for -opsystem are: bsd4-2, usg5-2-2, usg5-3,
  isc2-2, 386-ix, esix, linux, sco3.2v4, and xenix.

  18.58 should support a wide variety of operating systems.
  Use isc2-2 for Interactive 386/ix version 2.2.
  Use 386ix for prior versions.
  Use esix for Esix.
  Use linux for Linux.
  It isn't clear what to do on an SCO system.

  -machine=is386 is used for an Integrated Solutions 386 machine.
  It may also be correct for Microport systems.

Cubix QBx/386 (-machine=intel386 -opsystem=usg5-3)

  Changes merged in 19.1.  Systems before 2/A/0 may fail to compile etags.c
  due to a compiler bug.

Prime EXL (-machine=intel386 -opsystem=usg5-3)

  Minor changes merged in 19.1.
NOTE-END */

/* The following three symbols give information on
 the size of various data types.  */


/* Linux defines these in <values.h>, but they can't be used in #if's */
#undef SHORTBITS
#undef INTBITS
#undef LONGBITS
  
#define SHORTBITS 16		/* Number of bits in a short */

#define INTBITS 32		/* Number of bits in an int */

#define LONGBITS 32		/* Number of bits in a long */

/* i386 is not big-endian: lowest numbered byte is least significant. */

/* #undef BIG_ENDIAN */

/* Define NO_ARG_ARRAY if you cannot take the address of the first of a
 * group of arguments and treat it as an array of the arguments.  */

/* #define NO_ARG_ARRAY */

/* Define WORD_MACHINE if addresses and such have
 * to be corrected before they can be used as byte counts.  */

/* #define WORD_MACHINE */

/* Now define a symbol for the cpu type, if your compiler
   does not define it automatically:
   Ones defined so far include vax, m68000, ns16000, pyramid,
   orion, tahoe, APOLLO and many others */

#define INTEL386

/* Use type int rather than a union, to represent Lisp_Object */

#define NO_UNION_TYPE

/* crt0.c, if it is used, should use the i386-bsd style of entry.
   with no extra dummy args.  On USG and XENIX,
   NO_REMAP says this isn't used. */

#define CRT0_DUMMIES bogus_fp,

/* crt0.c should define a symbol `start' and do .globl with a dot.  */

#define DOT_GLOBAL_START

#ifdef XENIX
/* Data type of load average, as read out of kmem.  */
#define LOAD_AVE_TYPE short

/* Convert that into an integer that is 100 for a load average of 1.0  */
#define LOAD_AVE_CVT(x) (((double) (x)) * 100.0 / FSCALE)
  
#define FSCALE 256.0         /* determined by experimentation...  */
#endif


#ifdef SOLARIS2
/* Data type of load average, as read out of kmem.  */
#define LOAD_AVE_TYPE long

/* Convert that into an integer that is 100 for a load average of 1.0  */
/* This is totally uncalibrated. */
#define LOAD_AVE_CVT(x) ((int) (((double) (x)) * 100.0 / FSCALE))

/* j.w.hawtin@lut.ac.uk says Solaris 2.1 on the X86 needs -lkvm, and it 
   already has FSCALE defined in a system header.  configure thinks solaris
   X86 has gethostname but it does not work so undefine it.  */
#define LIBS_MACHINE -lkvm
#undef HAVE_GETHOSTNAME

#else /* not SOLARIS2 */
#ifdef USG5_4 /* Older USG systems do not support the load average.  */
/* Data type of load average, as read out of kmem.  */

#define LOAD_AVE_TYPE long

/* Convert that into an integer that is 100 for a load average of 1.0  */
/* This is totally uncalibrated. */

#define LOAD_AVE_CVT(x) ((int) (((double) (x)) * 100.0 / FSCALE))
#define FSCALE 256.0
#endif
#endif /* not SOLARIS2 */

/* Define CANNOT_DUMP on machines where unexec does not work.
   Then the function dump-emacs will not be defined
   and temacs will do (load "loadup") automatically unless told otherwise.  */

/* #define CANNOT_DUMP */

/* Define VIRT_ADDR_VARIES if the virtual addresses of
   pure and impure space as loaded can vary, and even their
   relative order cannot be relied on.

   Otherwise Emacs assumes that text space precedes data space,
   numerically.  */

/* #define VIRT_ADDR_VARIES */

#ifdef XENIX
#define VALBITS 26
#define GCTYPEBITS 5

/* Define NO_REMAP if memory segmentation makes it not work well
   to change the boundary between the text section and data section
   when Emacs is dumped.  If you define this, the preloaded Lisp
   code will not be sharable; but that's better than failing completely.  */

#define NO_REMAP

#define STACK_DIRECTION -1

/* Since cannot purify, use standard Xenix 386 startup code. */

#define START_FILES	/lib/386/Sseg.o pre-crt0.o /lib/386/Scrt0.o

/* These really use terminfo.  */

#define LIBS_TERMCAP /lib/386/Slibcurses.a  \
   /lib/386/Slibtinfo.a /lib/386/Slibx.a

/* Standard libraries for this machine.  Since `-l' doesn't work in `ld'.  */
/* '__fltused' is unresolved w/o Slibcfp.a */
#define LIB_STANDARD /lib/386/Slibcfp.a /lib/386/Slibc.a
#else /* not XENIX */

/* this brings in alloca() if we're using cc */
#ifdef USG
#ifndef LIB_STANDARD
#ifdef USG5_4
#define LIB_STANDARD -lc
#else /* not USG5_4 */
#define LIB_STANDARD -lPW -lc
#endif /* not USG5_4 */
#endif /* LIB_STANDARD */

#define HAVE_ALLOCA
#define NO_REMAP 
#define TEXT_START 0
#endif /* USG */
#endif /* not XENIX */

#ifdef BSD
#define HAVE_ALLOCA
#endif /* BSD */

/* If compiling with GCC, let GCC implement alloca.  */
#if defined(__GNUC__) && !defined(alloca)
#define alloca(n) __builtin_alloca(n)
#define HAVE_ALLOCA
#endif

#ifdef USG5_4
#define DATA_SEG_BITS 0x08000000
#endif
Commit	Line	Data
23b0668c	1	/* Machine description file for intel 386.
20c428fd JB	2	Copyright (C) 1987 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
17385adc	8	the Free Software Foundation; either version 2, or (at your option)
20c428fd JB	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="note"
	24
	25	NOTE-START
	26	Intel 386 (-machine=intel386 or -machine=is386.h)
	27
	28	The possibilities for -opsystem are: bsd4-2, usg5-2-2, usg5-3,
b2aaf43a	29	isc2-2, 386-ix, esix, linux, sco3.2v4, and xenix.
20c428fd JB	30
	31	18.58 should support a wide variety of operating systems.
	32	Use isc2-2 for Interactive 386/ix version 2.2.
	33	Use 386ix for prior versions.
b2aaf43a JB	34	Use esix for Esix.
	35	Use linux for Linux.
	36	It isn't clear what to do on an SCO system.
20c428fd JB	37
	38	-machine=is386 is used for an Integrated Solutions 386 machine.
	39	It may also be correct for Microport systems.
	40
	41	Cubix QBx/386 (-machine=intel386 -opsystem=usg5-3)
	42
	43	Changes merged in 19.1. Systems before 2/A/0 may fail to compile etags.c
	44	due to a compiler bug.
	45
	46	Prime EXL (-machine=intel386 -opsystem=usg5-3)
	47
	48	Minor changes merged in 19.1.
	49	NOTE-END */
	50
	51	/* The following three symbols give information on
	52	the size of various data types. */
	53
b2aaf43a JB	54
	55	/* Linux defines these in <values.h>, but they can't be used in #if's */
	56	#undef SHORTBITS
	57	#undef INTBITS
	58	#undef LONGBITS
	59
20c428fd JB	60	#define SHORTBITS 16 /* Number of bits in a short */
	61
	62	#define INTBITS 32 /* Number of bits in an int */
	63
	64	#define LONGBITS 32 /* Number of bits in a long */
	65
	66	/* i386 is not big-endian: lowest numbered byte is least significant. */
	67
	68	/* #undef BIG_ENDIAN */
	69
	70	/* Define NO_ARG_ARRAY if you cannot take the address of the first of a
	71	* group of arguments and treat it as an array of the arguments. */
	72
	73	/* #define NO_ARG_ARRAY */
	74
	75	/* Define WORD_MACHINE if addresses and such have
	76	* to be corrected before they can be used as byte counts. */
	77
	78	/* #define WORD_MACHINE */
	79
20c428fd JB	80	/* Now define a symbol for the cpu type, if your compiler
	81	does not define it automatically:
	82	Ones defined so far include vax, m68000, ns16000, pyramid,
	83	orion, tahoe, APOLLO and many others */
	84
	85	#define INTEL386
	86
	87	/* Use type int rather than a union, to represent Lisp_Object */
	88
	89	#define NO_UNION_TYPE
	90
	91	/* crt0.c, if it is used, should use the i386-bsd style of entry.
	92	with no extra dummy args. On USG and XENIX,
	93	NO_REMAP says this isn't used. */
	94
	95	#define CRT0_DUMMIES bogus_fp,
	96
	97	/* crt0.c should define a symbol `start' and do .globl with a dot. */
	98
	99	#define DOT_GLOBAL_START
	100
	101	#ifdef XENIX
	102	/* Data type of load average, as read out of kmem. */
	103	#define LOAD_AVE_TYPE short
	104
	105	/* Convert that into an integer that is 100 for a load average of 1.0 */
23b0668c	106	#define LOAD_AVE_CVT(x) (((double) (x)) * 100.0 / FSCALE)
20c428fd JB	107
	108	#define FSCALE 256.0 /* determined by experimentation... */
	109	#endif
	110
20c428fd	111
bb0807e7 RS	112	#ifdef SOLARIS2
	113	/* Data type of load average, as read out of kmem. */
	114	#define LOAD_AVE_TYPE long
	115
	116	/* Convert that into an integer that is 100 for a load average of 1.0 */
	117	/* This is totally uncalibrated. */
	118	#define LOAD_AVE_CVT(x) ((int) (((double) (x)) * 100.0 / FSCALE))
	119
	120	/* j.w.hawtin@lut.ac.uk says Solaris 2.1 on the X86 needs -lkvm, and it
	121	already has FSCALE defined in a system header. configure thinks solaris
	122	X86 has gethostname but it does not work so undefine it. */
	123	#define LIBS_MACHINE -lkvm
	124	#undef HAVE_GETHOSTNAME
5d32abe6 RS	125
	126	#else /* not SOLARIS2 */
	127	#ifdef USG5_4 /* Older USG systems do not support the load average. */
	128	/* Data type of load average, as read out of kmem. */
	129
	130	#define LOAD_AVE_TYPE long
	131
	132	/* Convert that into an integer that is 100 for a load average of 1.0 */
	133	/* This is totally uncalibrated. */
	134
	135	#define LOAD_AVE_CVT(x) ((int) (((double) (x)) * 100.0 / FSCALE))
	136	#define FSCALE 256.0
bb0807e7	137	#endif
5d32abe6	138	#endif /* not SOLARIS2 */
bb0807e7	139
20c428fd JB	140	/* Define CANNOT_DUMP on machines where unexec does not work.
	141	Then the function dump-emacs will not be defined
	142	and temacs will do (load "loadup") automatically unless told otherwise. */
	143
	144	/* #define CANNOT_DUMP */
	145
	146	/* Define VIRT_ADDR_VARIES if the virtual addresses of
	147	pure and impure space as loaded can vary, and even their
	148	relative order cannot be relied on.
	149
	150	Otherwise Emacs assumes that text space precedes data space,
	151	numerically. */
	152
	153	/* #define VIRT_ADDR_VARIES */
	154
	155	#ifdef XENIX
	156	#define VALBITS 26
	157	#define GCTYPEBITS 5
	158
	159	/* Define NO_REMAP if memory segmentation makes it not work well
	160	to change the boundary between the text section and data section
	161	when Emacs is dumped. If you define this, the preloaded Lisp
	162	code will not be sharable; but that's better than failing completely. */
	163
	164	#define NO_REMAP
	165
	166	#define STACK_DIRECTION -1
	167
	168	/* Since cannot purify, use standard Xenix 386 startup code. */
	169
	170	#define START_FILES /lib/386/Sseg.o pre-crt0.o /lib/386/Scrt0.o
	171
	172	/* These really use terminfo. */
	173
	174	#define LIBS_TERMCAP /lib/386/Slibcurses.a \
	175	/lib/386/Slibtinfo.a /lib/386/Slibx.a
	176
	177	/* Standard libraries for this machine. Since `-l' doesn't work in `ld'. */
	178	/* '__fltused' is unresolved w/o Slibcfp.a */
	179	#define LIB_STANDARD /lib/386/Slibcfp.a /lib/386/Slibc.a
	180	#else /* not XENIX */
	181
399c3df8	182	/* this brings in alloca() if we're using cc */
20c428fd	183	#ifdef USG
23b0668c	184	#ifndef LIB_STANDARD
399c3df8 JB	185	#ifdef USG5_4
	186	#define LIB_STANDARD -lc
	187	#else /* not USG5_4 */
20c428fd	188	#define LIB_STANDARD -lPW -lc
399c3df8 JB	189	#endif /* not USG5_4 */
	190	#endif /* LIB_STANDARD */
	191
20c428fd JB	192	#define HAVE_ALLOCA
	193	#define NO_REMAP
	194	#define TEXT_START 0
ebfbbbe4	195	#endif /* USG */
20c428fd JB	196	#endif /* not XENIX */
	197
	198	#ifdef BSD
	199	#define HAVE_ALLOCA
	200	#endif /* BSD */
20c428fd JB	201
	202	/* If compiling with GCC, let GCC implement alloca. */
	203	#if defined(__GNUC__) && !defined(alloca)
	204	#define alloca(n) __builtin_alloca(n)
	205	#define HAVE_ALLOCA
	206	#endif
	207
23b0668c JB	208	#ifdef USG5_4
	209	#define DATA_SEG_BITS 0x08000000
	210	#endif