src/m/ia64.h

   1 /* machine description file for the IA-64 architecture.
   2    Copyright (C) 2000, 2002 Free Software Foundation, Inc.
   3      Contributed by David Mosberger <davidm@hpl.hp.com>
   4
   5 This file is part of GNU Emacs.
   6
   7 GNU Emacs is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 1, or (at your option)
  10 any later version.
  11
  12 GNU Emacs is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU Emacs; see the file COPYING.  If not, write to
  19 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  20 Boston, MA 02111-1307, USA.  */
  21
  22 #define BITS_PER_LONG           64
  23 #define BITS_PER_EMACS_INT      64
  24
  25 /* Define WORDS_BIG_ENDIAN iff lowest-numbered byte in a word
  26    is the most significant byte.  */
  27
  28 #undef 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    Ones defined so far include vax, m68000, ns16000, pyramid,
  43    orion, tahoe, APOLLO and many others */
  44
  45 /* __ia64__ defined automatically */
  46
  47
  48 /* Use type EMACS_INT rather than a union, to represent Lisp_Object */
  49 /* This is desirable for most machines.  */
  50
  51 #define NO_UNION_TYPE
  52
  53 /* Define the type to use.  */
  54 #define EMACS_INT               long
  55 #define EMACS_UINT              unsigned long
  56 #define SPECIAL_EMACS_INT
  57
  58 /* Define EXPLICIT_SIGN_EXTEND if XINT must explicitly sign-extend
  59    the 24-bit bit field into an int.  In other words, if bit fields
  60    are always unsigned.
  61
  62    If you use NO_UNION_TYPE, this flag does not matter.  */
  63
  64 #define EXPLICIT_SIGN_EXTEND
  65
  66 /* Data type of load average, as read out of kmem.  */
  67
  68 #define LOAD_AVE_TYPE           long
  69
  70 /* Convert that into an integer that is 100 for a load average of 1.0  */
  71
  72 #define LOAD_AVE_CVT(x) (int) (((double) (x)) * 100.0 / FSCALE)
  73
  74 /* Define CANNOT_DUMP on machines where unexec does not work.
  75    Then the function dump-emacs will not be defined
  76    and temacs will do (load "loadup") automatically unless told otherwise.  */
  77 #if 0
  78 #define CANNOT_DUMP
  79 #endif
  80
  81 /* Define VIRT_ADDR_VARIES if the virtual addresses of
  82    pure and impure space as loaded can vary, and even their
  83    relative order cannot be relied on.
  84
  85    Otherwise Emacs assumes that text space precedes data space,
  86    numerically.  */
  87
  88 /* #define VIRT_ADDR_VARIES */
  89
  90 /* Define the following if GNU malloc and the relocating allocator do
  91    not work together with X.  */
  92
  93 /* #define SYSTEM_MALLOC */
  94
  95 /* Define NO_REMAP if memory segmentation makes it not work well
  96    to change the boundary between the text section and data section
  97    when Emacs is dumped.  If you define this, the preloaded Lisp
  98    code will not be sharable; but that's better than failing completely.  */
  99
 100 /* #define NO_REMAP */
 101
 102 /* Some really obscure 4.2-based systems (like Sequent DYNIX) do not
 103    support asynchronous I/O (using SIGIO) on sockets, even though it
 104    works fine on tty's.  If you have one of these systems, define the
 105    following, and then use it in config.h (or elsewhere) to decide
 106    when (not) to use SIGIO.
 107
 108    You'd think this would go in an operating-system description file,
 109    but since it only occurs on some, but not all, BSD systems, the
 110    reasonable place to select for it is in the machine description
 111    file.  */
 112
 113 /* #define NO_SOCK_SIGIO */
 114
 115 #ifdef __ELF__
 116 #undef UNEXEC
 117 #define UNEXEC unexelf.o
 118 #endif
 119
 120 #define PNTR_COMPARISON_TYPE unsigned long
 121
 122 /* On the 64 bit architecture, we can use 60 bits for addresses */
 123
 124 #define VALBITS         60
 125
 126 /* This definition of MARKBIT is necessary because of the comparison of
 127    ARRAY_MARK_FLAG and MARKBIT in an #if in lisp.h, which cpp doesn't like. */
 128
 129 #define MARKBIT         0x8000000000000000L
 130
 131 /* Define XINT and XUINT so that they can take arguments of type int */
 132
 133 #define XINT(a)  (((long) (a) << (BITS_PER_LONG - VALBITS)) >> (BITS_PER_LONG - VALBITS))
 134 #define XUINT(a) ((long) (a) & VALMASK)
 135
 136 #ifndef NOT_C_CODE
 137
 138 #ifdef REL_ALLOC
 139 #ifndef _MALLOC_INTERNAL
 140 /* "char *" because ralloc.c defines it that way.  gmalloc.c thinks it
 141    is allowed to prototype these as "void *" so we don't prototype in
 142    that case.  You're right: it stinks!  */
 143 extern char *r_alloc (), *r_re_alloc ();
 144 extern void r_alloc_free ();
 145 #endif /* not _MALLOC_INTERNAL */
 146 #endif /* REL_ALLOC */
 147
 148 #endif /* not NOT_C_CODE */
 149
 150 #define DATA_SEG_BITS   0x6000000000000000
 151
 152 #define HAVE_TEXT_START