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annotate src/m/x86_64.h @ 5920:0f2338afbabf cygwin

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Minimum necessary to get started: sufficient to compile OK, run -nw, but not with window
author Henry Thompson <ht@markup.co.uk>
date Mon, 21 Apr 2014 11:42:50 +0100
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5920
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1 /* Machine description file for intel 386.
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2 Copyright (C) 1987 Free Software Foundation, Inc.
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3
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4 This file is part of XEmacs.
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5
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6 XEmacs is free software: you can redistribute it and/or modify it
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7 under the terms of the GNU General Public License as published by the
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8 Free Software Foundation, either version 3 of the License, or (at your
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9 option) any later version.
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10
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11 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with XEmacs. If not, see <http://www.gnu.org/licenses/>. */
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18
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19 /* Synched up with: FSF 19.31. */
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20
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21 /* The following line tells the configuration script what sort of
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22 operating system this machine is likely to run.
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23 USUAL-OPSYS="note"
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24
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25 NOTE-START
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26 Intel 386 (-machine=intel386 or -machine=is386.h)
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27
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28 The possibilities for -opsystem are: bsd4-2, usg5-4, usg5-4-2, and linux.
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29
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30 18.58 should support a wide variety of operating systems.
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31 Use linux for Linux.
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32 It isn't clear what to do on an SCO system.
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33
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34 Cubix QBx/386 (-machine=intel386 -opsystem=usg5-3)
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35
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36 Changes merged in 19.1. Systems before 2/A/0 may fail to compile etags.c
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37 due to a compiler bug.
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38 NOTE-END */
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39
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40 /* Now define a symbol for the cpu type, if your compiler
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41 does not define it automatically:
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42 Ones defined so far include vax, m68000, ns16000, pyramid,
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43 orion, tahoe, APOLLO and many others */
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44
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45 #define INTEL386
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46
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47 /* crt0.c, if it is used, should use the i386-bsd style of entry.
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48 with no extra dummy args. On USG, NO_REMAP says this isn't used. */
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49
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50 /* Mly 16-Jan-96 16:38:32: this is part of a prototype -- same bug present in
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51 other m*.h files */
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52 #define CRT0_DUMMIES int bogus_fp,
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53
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54 /* crt0.c should define a symbol `start' and do .globl with a dot. */
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55
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56 #define DOT_GLOBAL_START
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57
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58 #ifdef SOLARIS2
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59
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60 #ifdef ENABLE_SM_FILE_DECLS_OF_LOADAVG_STUFF
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61
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62 /* Data type of load average, as read out of kmem. */
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63 #define LOAD_AVE_TYPE long
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64
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65 /* Convert that into an integer that is 100 for a load average of 1.0 */
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66 /* This is totally uncalibrated. */
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67 #define LOAD_AVE_CVT(x) ((int) (((double) (x)) * 100.0 / FSCALE))
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68
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69 #endif /* ENABLE_SM_FILE_DECLS_OF_LOADAVG_STUFF */
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70
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71 /* configure thinks solaris X86 has gethostname, but it does not work,
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72 so undefine it. */
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73 #undef HAVE_GETHOSTNAME
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74
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75 #else /* not SOLARIS2 */
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76 #ifdef USG5_4 /* Older USG systems do not support the load average. */
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77 /* Data type of load average, as read out of kmem. */
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78
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79 #ifdef ENABLE_SM_FILE_DECLS_OF_LOADAVG_STUFF
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80
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81 #define LOAD_AVE_TYPE long
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82
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83 /* Convert that into an integer that is 100 for a load average of 1.0 */
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84 /* This is totally uncalibrated. */
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85
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86 #define LOAD_AVE_CVT(x) ((int) (((double) (x)) * 100.0 / FSCALE))
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87 #define FSCALE 256.0
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88
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89 #endif /* ENABLE_SM_FILE_DECLS_OF_LOADAVG_STUFF */
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90
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91 #endif
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92 #endif /* not SOLARIS2 */
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93
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94 #ifdef USG
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95 #define NO_REMAP
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96 #define TEXT_START 0
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97 #endif /* USG */
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98
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99 #ifdef linux
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100 /* libc-linux/sysdeps/linux/i386/ulimit.c says that due to shared library, */
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101 /* we cannot get the maximum address for brk */
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102 #define ULIMIT_BREAK_VALUE (32*1024*1024)
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103
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104 #define SEGMENT_MASK ((SEGMENT_SIZE)-1)
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105 #endif