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Annotation of 43BSDReno/contrib/emacs-18.55/src/m-elxsi.h, revision 1.1

1.1     ! root        1: /* m- file for Elxsi machine (running enix).
        !             2:    Copyright (C) 1986 Free Software Foundation, Inc.
        !             3:    Adapted by John Salmon
        !             4: 
        !             5: This file is part of GNU Emacs.
        !             6: 
        !             7: GNU Emacs is distributed in the hope that it will be useful,
        !             8: but WITHOUT ANY WARRANTY.  No author or distributor
        !             9: accepts responsibility to anyone for the consequences of using it
        !            10: or for whether it serves any particular purpose or works at all,
        !            11: unless he says so in writing.  Refer to the GNU Emacs General Public
        !            12: License for full details.
        !            13: 
        !            14: Everyone is granted permission to copy, modify and redistribute
        !            15: GNU Emacs, but only under the conditions described in the
        !            16: GNU Emacs General Public License.   A copy of this license is
        !            17: supposed to have been given to you along with GNU Emacs so you
        !            18: can know your rights and responsibilities.  It should be in a
        !            19: file named COPYING.  Among other things, the copyright notice
        !            20: and this notice must be preserved on all copies.  */
        !            21: 
        !            22: 
        !            23: /* The following three symbols give information on
        !            24:  the size of various data types.  */
        !            25: 
        !            26: #define SHORTBITS 16           /* Number of bits in a short */
        !            27: 
        !            28: #define INTBITS 32             /* Number of bits in an int */
        !            29: 
        !            30: #define LONGBITS 32            /* Number of bits in a long */
        !            31: 
        !            32: /* Define BIG_ENDIAN iff lowest-numbered byte in a word
        !            33:    is the most significant byte.  */
        !            34: 
        !            35: /*#define BIG_ENDIAN*/
        !            36: 
        !            37: /* Define NO_ARG_ARRAY if you cannot take the address of the first of a
        !            38:  * group of arguments and treat it as an array of the arguments.  */
        !            39: 
        !            40: /*#define NO_ARG_ARRAY */
        !            41: 
        !            42: /* Define WORD_MACHINE if addresses and such have
        !            43:  * to be corrected before they can be used as byte counts.  */
        !            44: 
        !            45: #define WORD_MACHINE
        !            46: 
        !            47: /* Define how to take a char and sign-extend into an int.
        !            48:    On machines where char is signed, this is a no-op.  */
        !            49: 
        !            50: #define SIGN_EXTEND_CHAR(c) ((int)c)
        !            51: 
        !            52: /* Now define a symbol for the cpu type, if your compiler
        !            53:    does not define it automatically:
        !            54:    vax, m68000, ns16000, pyramid, orion, tahoe and APOLLO
        !            55:    are the ones defined so far.  */
        !            56: 
        !            57: #ifndef elxsi
        !            58: #define elxsi
        !            59: #endif
        !            60: 
        !            61: /* Use type int rather than a union, to represent Lisp_Object */
        !            62: /* This is desirable for most machines.  */
        !            63: 
        !            64: #define NO_UNION_TYPE
        !            65: 
        !            66: /* Define EXPLICIT_SIGN_EXTEND if XINT must explicitly sign-extend
        !            67:    the 24-bit bit field into an int.  In other words, if bit fields
        !            68:    are always unsigned.
        !            69: 
        !            70:    If you use NO_UNION_TYPE, this flag does not matter.  */
        !            71: 
        !            72: #define EXPLICIT_SIGN_EXTEND
        !            73: 
        !            74: /* Data type of load average, as read out of kmem.  */
        !            75: 
        !            76: /*#define LOAD_AVE_TYPE long */
        !            77: 
        !            78: /* Convert that into an integer that is 100 for a load average of 1.0  */
        !            79: 
        !            80: /*#define LOAD_AVE_CVT(x) (int) (((double) (x)) * 100.0 / FSCALE) */
        !            81: 
        !            82: /* Define CANNOT_DUMP on machines where unexec does not work.
        !            83:    Then the function dump-emacs will not be defined
        !            84:    and temacs will do (load "loadup") automatically unless told otherwise.
        !            85: 
        !            86:    The Elxsi can in principle dump, but the necessary changes to
        !            87:    unexec, which involve byte-swapping, were too ugly to install.
        !            88:    If someone submits simple code that supports dumping on the Elxsi,
        !            89:    it can be installed and CANNOT_DUMP can be turned off.  */
        !            90: 
        !            91: #define CANNOT_DUMP
        !            92: 
        !            93: /* Define VIRT_ADDR_VARIES if the virtual addresses of
        !            94:    pure and impure space as loaded can vary, and even their
        !            95:    relative order cannot be relied on.
        !            96: 
        !            97:    Otherwise Emacs assumes that text space precedes data space,
        !            98:    numerically.  */
        !            99: 
        !           100: /* #define VIRT_ADDR_VARIES */
        !           101: 
        !           102: /* Define C_ALLOCA if this machine does not support a true alloca
        !           103:    and the one written in C should be used instead.
        !           104:    Define HAVE_ALLOCA to say that the system provides a properly
        !           105:    working alloca function and it should be used.
        !           106:    Define neither one if an assembler-language alloca
        !           107:    in the file alloca.s should be used.  */
        !           108: 
        !           109: #define C_ALLOCA
        !           110: /*#define HAVE_ALLOCA */
        !           111: 
        !           112: /* Define NO_REMAP if memory segmentation makes it not work well
        !           113:    to change the boundary between the text section and data section
        !           114:    when Emacs is dumped.  If you define this, the preloaded Lisp
        !           115:    code will not be sharable; but that's better than failing completely.  */
        !           116: /*#define NO_REMAP*/
        !           117: 
        !           118: /* This is a guess for an alternate solution to whatever
        !           119:    problem motivated defining _sobuf in sysdep,c with extern char *_sobuf.  */
        !           120: #define _sobuf xsobuf
        !           121: 
        !           122: /* Address of start of text segment as loaded.  */
        !           123: 
        !           124: #define TEXT_START     0x800
        !           125: 
        !           126: /* Tell crt0.c not to define environ.  */
        !           127: 
        !           128: #define DONT_NEED_ENVIRON
        !           129: 
        !           130: /* The elxsi has no debugger, so might as well optimize instead
        !           131:    of trying to make a symbol table.  */
        !           132: 
        !           133: #define C_DEBUG_SWITCH -O

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