dlls/kernel/system.c

   1 /*
   2  * SYSTEM DLL routines
   3  *
   4  * Copyright 1996 Alexandre Julliard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #define NONAMELESSUNION
  22 #define NONAMELESSSTRUCT
  23 #include <stdarg.h>
  24
  25 #include "windef.h"
  26 #include "winbase.h"
  27 #include "wingdi.h"
  28 #include "wine/winbase16.h"
  29 #include "wine/winuser16.h"
  30 #include "wownt32.h"
  31 #include "kernel_private.h"
  32 #include "kernel16_private.h"
  33 #include "wine/debug.h"
  34
  35 WINE_DEFAULT_DEBUG_CHANNEL(system);
  36
  37 typedef struct
  38 {
  39     SYSTEMTIMERPROC callback;  /* NULL if not in use */
  40     FARPROC16       callback16;
  41     INT             rate;
  42     INT             ticks;
  43 } SYSTEM_TIMER;
  44
  45 #define NB_SYS_TIMERS   8
  46 #define SYS_TIMER_RATE  54925
  47
  48 static SYSTEM_TIMER SYS_Timers[NB_SYS_TIMERS];
  49 static int SYS_NbTimers = 0;
  50 static HANDLE SYS_timer;
  51 static HANDLE SYS_thread;
  52 static int SYS_timers_disabled;
  53
  54 /***********************************************************************
  55  *           SYSTEM_TimerTick
  56  */
  57 static void CALLBACK SYSTEM_TimerTick( LPVOID arg, DWORD low, DWORD high )
  58 {
  59     int i;
  60
  61     if (SYS_timers_disabled) return;
  62     for (i = 0; i < NB_SYS_TIMERS; i++)
  63     {
  64         if (!SYS_Timers[i].callback) continue;
  65         if ((SYS_Timers[i].ticks -= SYS_TIMER_RATE) <= 0)
  66         {
  67             SYS_Timers[i].ticks += SYS_Timers[i].rate;
  68             SYS_Timers[i].callback( i+1 );
  69         }
  70     }
  71 }
  72
  73
  74 /***********************************************************************
  75  *           SYSTEM_TimerThread
  76  */
  77 static DWORD CALLBACK SYSTEM_TimerThread( void *dummy )
  78 {
  79     LARGE_INTEGER when;
  80
  81     if (!(SYS_timer = CreateWaitableTimerA( NULL, FALSE, NULL ))) return 0;
  82
  83     when.u.LowPart = when.u.HighPart = 0;
  84     SetWaitableTimer( SYS_timer, &when, (SYS_TIMER_RATE+500)/1000, SYSTEM_TimerTick, 0, FALSE );
  85     for (;;) SleepEx( INFINITE, TRUE );
  86 }
  87
  88
  89 /**********************************************************************
  90  *           SYSTEM_StartTicks
  91  *
  92  * Start the system tick timer.
  93  */
  94 static void SYSTEM_StartTicks(void)
  95 {
  96     if (!SYS_thread) SYS_thread = CreateThread( NULL, 0, SYSTEM_TimerThread, NULL, 0, NULL );
  97 }
  98
  99
 100 /**********************************************************************
 101  *           SYSTEM_StopTicks
 102  *
 103  * Stop the system tick timer.
 104  */
 105 static void SYSTEM_StopTicks(void)
 106 {
 107     if (SYS_thread)
 108     {
 109         CancelWaitableTimer( SYS_timer );
 110         TerminateThread( SYS_thread, 0 );
 111         CloseHandle( SYS_thread );
 112         CloseHandle( SYS_timer );
 113         SYS_thread = 0;
 114     }
 115 }
 116
 117
 118 /***********************************************************************
 119  *           InquireSystem   (SYSTEM.1)
 120  *
 121  * Note: the function always takes 2 WORD arguments, contrary to what
 122  *       "Undocumented Windows" says.
 123   */
 124 DWORD WINAPI InquireSystem16( WORD code, WORD arg )
 125 {
 126     WORD drivetype;
 127
 128     switch(code)
 129     {
 130     case 0:  /* Get timer resolution */
 131         return SYS_TIMER_RATE;
 132
 133     case 1:  /* Get drive type */
 134         drivetype = GetDriveType16( arg );
 135         return MAKELONG( drivetype, drivetype );
 136
 137     case 2:  /* Enable one-drive logic */
 138         FIXME("Case %d: set single-drive %d not supported\n", code, arg );
 139         return 0;
 140     }
 141     WARN("Unknown code %d\n", code );
 142     return 0;
 143 }
 144
 145
 146 /***********************************************************************
 147  *           CreateSystemTimer   (SYSTEM.2)
 148  */
 149 WORD WINAPI CreateSystemTimer( WORD rate, SYSTEMTIMERPROC callback )
 150 {
 151     int i;
 152     for (i = 0; i < NB_SYS_TIMERS; i++)
 153         if (!SYS_Timers[i].callback)  /* Found one */
 154         {
 155             SYS_Timers[i].rate = (UINT)rate * 1000;
 156             if (SYS_Timers[i].rate < SYS_TIMER_RATE)
 157                 SYS_Timers[i].rate = SYS_TIMER_RATE;
 158             SYS_Timers[i].ticks = SYS_Timers[i].rate;
 159             SYS_Timers[i].callback = callback;
 160             if (++SYS_NbTimers == 1) SYSTEM_StartTicks();
 161             return i + 1;  /* 0 means error */
 162         }
 163     return 0;
 164 }
 165
 166 /**********************************************************************/
 167
 168 static void call_timer_proc16( WORD timer )
 169 {
 170     CONTEXT86 context;
 171     FARPROC16 proc = SYS_Timers[timer-1].callback16;
 172
 173     memset( &context, 0, sizeof(context) );
 174
 175     context.SegFs = wine_get_fs();
 176     context.SegGs = wine_get_gs();
 177     context.SegCs = SELECTOROF( proc );
 178     context.Eip   = OFFSETOF( proc );
 179     context.Ebp   = OFFSETOF(NtCurrentTeb()->WOW32Reserved) + (WORD)&((STACK16FRAME*)0)->bp;
 180     context.Eax   = timer;
 181
 182     WOWCallback16Ex( 0, WCB16_REGS, 0, NULL, (DWORD *)&context );
 183 }
 184
 185 /**********************************************************************/
 186
 187 WORD WINAPI WIN16_CreateSystemTimer( WORD rate, FARPROC16 proc )
 188 {
 189     WORD ret = CreateSystemTimer( rate, call_timer_proc16 );
 190     if (ret) SYS_Timers[ret - 1].callback16 = proc;
 191     return ret;
 192 }
 193
 194
 195 /***********************************************************************
 196  *           KillSystemTimer   (SYSTEM.3)
 197  *
 198  * Note: do not confuse this function with USER.182
 199  */
 200 WORD WINAPI SYSTEM_KillSystemTimer( WORD timer )
 201 {
 202     if ( !timer || timer > NB_SYS_TIMERS || !SYS_Timers[timer-1].callback )
 203         return timer;  /* Error */
 204     SYS_Timers[timer-1].callback = NULL;
 205     if (!--SYS_NbTimers) SYSTEM_StopTicks();
 206     return 0;
 207 }
 208
 209
 210 /***********************************************************************
 211  *           EnableSystemTimers   (SYSTEM.4)
 212  */
 213 void WINAPI EnableSystemTimers16(void)
 214 {
 215     SYS_timers_disabled = 0;
 216 }
 217
 218
 219 /***********************************************************************
 220  *           DisableSystemTimers   (SYSTEM.5)
 221  */
 222 void WINAPI DisableSystemTimers16(void)
 223 {
 224     SYS_timers_disabled = 1;
 225 }
 226
 227
 228 /***********************************************************************
 229  *           Get80x87SaveSize   (SYSTEM.7)
 230  */
 231 WORD WINAPI Get80x87SaveSize16(void)
 232 {
 233     return 94;
 234 }
 235
 236
 237 /***********************************************************************
 238  *           Save80x87State   (SYSTEM.8)
 239  */
 240 void WINAPI Save80x87State16( char *ptr )
 241 {
 242 #ifdef __i386__
 243     __asm__(".byte 0x66; fsave %0; fwait" : "=m" (ptr) );
 244 #endif
 245 }
 246
 247
 248 /***********************************************************************
 249  *           Restore80x87State   (SYSTEM.9)
 250  */
 251 void WINAPI Restore80x87State16( const char *ptr )
 252 {
 253 #ifdef __i386__
 254     __asm__(".byte 0x66; frstor %0" : : "m" (ptr) );
 255 #endif
 256 }