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Annotation of uae/src/md-i386-gcc/support.c, revision 1.1.1.8

1.1       root        1:  /* 
                      2:   * UAE - The Un*x Amiga Emulator
                      3:   * 
                      4:   * Miscellaneous machine dependent support functions and definitions
                      5:   *
                      6:   * Copyright 1996 Bernd Schmidt
                      7:   */
                      8: 
                      9: 
                     10: #include "sysconfig.h"
                     11: #include "sysdeps.h"
                     12: 
                     13: #include "config.h"
                     14: #include "options.h"
                     15: #include "machdep/m68k.h"
1.1.1.3   root       16: #include "events.h"
1.1.1.5   root       17: #include "custom.h"
1.1       root       18: 
1.1.1.2   root       19: #ifndef USE_UNDERSCORE
                     20: #define LARGE_ALIGNMENT ".align 16\n"
                     21: #else
                     22: #define LARGE_ALIGNMENT ".align 4,0x90\n"
                     23: #endif
                     24: 
1.1       root       25: struct flag_struct regflags;
                     26: 
1.1.1.6   root       27: /* All the Win32 configurations handle this in od-win32/win32.c */
                     28: #ifndef _WIN32
1.1       root       29: 
1.1.1.6   root       30: #include <signal.h>
1.1.1.2   root       31: 
1.1.1.6   root       32: static volatile frame_time_t last_time, best_time;
                     33: static volatile int loops_to_go;
1.1.1.2   root       34: 
1.1.1.6   root       35: #ifndef HAVE_SETITIMER
                     36: #define TIME_UNIT 1000000
1.1.1.2   root       37: #else
1.1.1.6   root       38: #define TIME_UNIT 100000
1.1.1.2   root       39: #endif
                     40: 
1.1.1.6   root       41: static void set_alarm (void)
                     42: {
                     43: #ifndef HAVE_SETITIMER
                     44:     alarm (1);
                     45: #else
                     46:     struct itimerval t;
                     47:     t.it_value.tv_sec = 0;
                     48:     t.it_value.tv_usec = TIME_UNIT;
                     49:     t.it_interval.tv_sec = 0;
                     50:     t.it_interval.tv_usec = TIME_UNIT;
                     51:     setitimer (ITIMER_REAL, &t, NULL);
1.1.1.2   root       52: #endif
1.1       root       53: }
1.1.1.2   root       54: 
1.1.1.6   root       55: static int first_loop = 1;
1.1.1.2   root       56: 
                     57: #ifdef __cplusplus
                     58: static RETSIGTYPE alarmhandler(...)
                     59: #else
                     60: static RETSIGTYPE alarmhandler(int foo)
                     61: #endif
                     62: {
                     63:     frame_time_t bar;
                     64:     bar = read_processor_time ();
1.1.1.6   root       65:     if (! first_loop && bar - last_time < best_time)
1.1.1.2   root       66:        best_time = bar - last_time;
1.1.1.6   root       67:     first_loop = 0;
1.1.1.2   root       68:     if (--loops_to_go > 0) {
                     69:        signal (SIGALRM, alarmhandler);
                     70:        last_time = read_processor_time();
1.1.1.6   root       71:        set_alarm ();
1.1.1.8 ! root       72:     } else {
        !            73:        alarm (0);
        !            74:        signal (SIGALRM, SIG_IGN);
1.1.1.2   root       75:     }
                     76: }
                     77: 
1.1.1.4   root       78: #include <setjmp.h>
                     79: jmp_buf catch_test;
                     80: 
1.1.1.3   root       81: #ifdef __cplusplus
                     82: static RETSIGTYPE illhandler(...)
                     83: #else
                     84: static RETSIGTYPE illhandler(int foo)
                     85: #endif
                     86: {
                     87:     rpt_available = 0;
1.1.1.4   root       88:     longjmp(catch_test,1);
1.1.1.3   root       89: }
                     90: 
1.1.1.2   root       91: void machdep_init (void)
                     92: {
1.1.1.3   root       93:     rpt_available = 1;
1.1.1.7   root       94:     write_log ("Testing the RDTSC instruction ... ");
1.1.1.3   root       95:     signal (SIGILL, illhandler);
1.1.1.5   root       96:     if (setjmp (catch_test) == 0)
                     97:        read_processor_time ();
1.1.1.3   root       98:     signal (SIGILL, SIG_DFL);
1.1.1.7   root       99:     write_log ("done.\n");
1.1.1.3   root      100:     if (! rpt_available) {
1.1.1.7   root      101:        write_log ("Your processor does not support the RDTSC instruction.\n");
1.1.1.3   root      102:        return;
                    103:     }
1.1.1.7   root      104:     write_log ("Calibrating delay loop.. ");
1.1.1.3   root      105:     fflush (stderr);
1.1.1.2   root      106:     best_time = (frame_time_t)-1;
                    107:     loops_to_go = 5;
                    108:     signal (SIGALRM, alarmhandler);
                    109:     /* We want exact values... */
                    110:     sync (); sync (); sync ();
                    111:     last_time = read_processor_time();
1.1.1.6   root      112:     set_alarm ();
1.1.1.2   root      113:     while (loops_to_go != 0)
1.1.1.6   root      114:        usleep (10000);
1.1.1.7   root      115:     write_log ("ok - %.2f BogoMIPS\n",
1.1.1.6   root      116:             ((double)best_time / TIME_UNIT), best_time);
                    117:     syncbase = best_time * (1000000 / TIME_UNIT);
1.1.1.2   root      118: }
                    119: 
                    120: #endif

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