1 // bootstrap.cxx -- bootstrap routines: main()
3 // Written by Curtis Olson, started May 1997.
5 // Copyright (C) 1997 - 2002 Curtis L. Olson - http://www.flightgear.org/~curt
7 // This program is free software; you can redistribute it and/or
8 // modify it under the terms of the GNU General Public License as
9 // published by the Free Software Foundation; either version 2 of the
10 // License, or (at your option) any later version.
12 // This program is distributed in the hope that it will be useful, but
13 // WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 // General Public License for more details.
17 // You should have received a copy of the GNU General Public License
18 // along with this program; if not, write to the Free Software
19 // Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
28 #if defined(__linux__) && defined(__i386__)
29 # include <fpu_control.h>
36 #include <simgear/compiler.h>
37 #include <simgear/structure/exception.hxx>
38 #include <simgear/debug/logstream.hxx>
45 #include "globals.hxx"
56 # include <console.h> // -dw- for command line dialog
59 // foreward declaration.
62 #if defined(__linux__) && defined(__i386__)
64 static void handleFPE (int);
69 fpu_control_t fpe_flags = 0;
70 _FPU_GETCW(fpe_flags);
71 // fpe_flags &= ~_FPU_MASK_IM; // invalid operation
72 // fpe_flags &= ~_FPU_MASK_DM; // denormalized operand
73 // fpe_flags &= ~_FPU_MASK_ZM; // zero-divide
74 // fpe_flags &= ~_FPU_MASK_OM; // overflow
75 // fpe_flags &= ~_FPU_MASK_UM; // underflow
76 // fpe_flags &= ~_FPU_MASK_PM; // precision (inexact result)
77 _FPU_SETCW(fpe_flags);
78 signal(SIGFPE, handleFPE);
85 SG_LOG(SG_GENERAL, SG_ALERT, "Floating point interrupt (SIGFPE)");
98 short CPSGetCurrentProcess(PSN *psn);
99 short CPSSetProcessName (PSN *psn, char *processname);
100 short CPSEnableForegroundOperation(PSN *psn, int _arg2, int _arg3, int _arg4, int _arg5);
101 short CPSSetFrontProcess(PSN *psn);
104 #define CPSEnableFG(psn) CPSEnableForegroundOperation(psn,0x03,0x3C,0x2C,0x1103)
109 int main ( int argc, char **argv );
110 int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
111 LPSTR lpCmdLine, int nCmdShow) {
113 main( __argc, __argv );
119 #include <sys/sysmp.h>
122 * set the special "flush zero" bit (FS, bit 24) in the Control Status
123 * Register of the FPU of R4k and beyond so that the result of any
124 * underflowing operation will be clamped to zero, and no exception of
125 * any kind will be generated on the CPU. This has no effect on an
131 f.fc_word = get_fpc_csr();
132 f.fc_struct.flush = 1;
133 set_fpc_csr(f.fc_word);
137 int _bootstrap_OSInit;
139 // Main entry point; catch any exceptions that have made it this far.
140 int main ( int argc, char **argv ) {
142 _bootstrap_OSInit = 0;
144 // Enable floating-point exceptions for Linux/x86
145 #if defined(__linux__) && defined(__i386__)
152 // Bind all non-rendering threads to CPU1
153 // This will reduce the jitter caused by them to an absolute minimum,
154 // but it will only work with superuser authority.
155 if ( geteuid() == 0 )
157 sysmp(MP_CLOCK, 0); // bind the timer only to CPU0
158 sysmp(MP_ISOLATE, 1 ); // Isolate CPU1
159 sysmp(MP_NONPREEMPTIVE, 1 ); // disable process time slicing on CPU1
163 // Enable floating-point exceptions for Windows
164 #if defined( _MSC_VER ) && defined( DEBUG )
165 // Christian, we should document what this does
166 _control87( _EM_INEXACT, _MCW_EM );
169 #if defined( HAVE_BC5PLUS )
170 _control87(MCW_EM, MCW_EM); /* defined in float.h */
173 // Keyboard focus hack
174 #if defined(__APPLE__) && !defined(OSX_BUNDLE)
178 fgOSInit (&argc, argv);
181 CPSGetCurrentProcess(&psn);
182 CPSSetProcessName(&psn, "FlightGear");
184 CPSSetFrontProcess(&psn);
188 // FIXME: add other, more specific
191 atexit(fgExitCleanup);
192 fgMainInit(argc, argv);
193 } catch (sg_throwable &t) {
194 // We must use cerr rather than
195 // logging, since logging may be
197 cerr << "Fatal error: " << t.getFormattedMessage()
198 << "\n (received from " << t.getOrigin() << ')' << endl;
200 cerr << "Unknown exception in the main loop. Aborting..." << endl;
201 perror("Possible cause");
207 // do some clean up on exit. Specifically we want to call alutExit()
208 // which happens in the sound manager destructor.
209 void fgExitCleanup() {
211 if (_bootstrap_OSInit != 0)
212 fgSetMouseCursor(MOUSE_CURSOR_POINTER);