misc/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 #include "windef.h"
  22 #include "wingdi.h"
  23 #include "wine/winbase16.h"
  24 #include "wine/winuser16.h"
  25 #include "stackframe.h"
  26 #include "wine/debug.h"
  27
  28 WINE_DEFAULT_DEBUG_CHANNEL(system);
  29
  30 typedef struct
  31 {
  32     SYSTEMTIMERPROC callback;  /* NULL if not in use */
  33     FARPROC16       callback16;
  34     INT             rate;
  35     INT             ticks;
  36 } SYSTEM_TIMER;
  37
  38 #define NB_SYS_TIMERS   8
  39 #define SYS_TIMER_RATE  54925
  40
  41 static SYSTEM_TIMER SYS_Timers[NB_SYS_TIMERS];
  42 static int SYS_NbTimers = 0;
  43 static HANDLE SYS_timer;
  44 static HANDLE SYS_thread;
  45 static int SYS_timers_disabled;
  46
  47 /***********************************************************************
  48  *           SYSTEM_TimerTick
  49  */
  50 static void CALLBACK SYSTEM_TimerTick( LPVOID arg, DWORD low, DWORD high )
  51 {
  52     int i;
  53
  54     if (SYS_timers_disabled) return;
  55     for (i = 0; i < NB_SYS_TIMERS; i++)
  56     {
  57         if (!SYS_Timers[i].callback) continue;
  58         if ((SYS_Timers[i].ticks -= SYS_TIMER_RATE) <= 0)
  59         {
  60             SYS_Timers[i].ticks += SYS_Timers[i].rate;
  61             SYS_Timers[i].callback( i+1 );
  62         }
  63     }
  64 }
  65
  66
  67 /***********************************************************************
  68  *           SYSTEM_TimerThread
  69  */
  70 static DWORD CALLBACK SYSTEM_TimerThread( void *dummy )
  71 {
  72     LARGE_INTEGER when;
  73
  74     if (!(SYS_timer = CreateWaitableTimerA( NULL, FALSE, NULL ))) return 0;
  75
  76     when.s.LowPart = when.s.HighPart = 0;
  77     SetWaitableTimer( SYS_timer, &when, (SYS_TIMER_RATE+500)/1000, SYSTEM_TimerTick, 0, FALSE );
  78     for (;;) WaitForMultipleObjectsEx( 0, NULL, FALSE, INFINITE, TRUE );
  79 }
  80
  81
  82 /**********************************************************************
  83  *           SYSTEM_StartTicks
  84  *
  85  * Start the system tick timer.
  86  */
  87 static void SYSTEM_StartTicks(void)
  88 {
  89     if (!SYS_thread) SYS_thread = CreateThread( NULL, 0, SYSTEM_TimerThread, NULL, 0, NULL );
  90 }
  91
  92
  93 /**********************************************************************
  94  *           SYSTEM_StopTicks
  95  *
  96  * Stop the system tick timer.
  97  */
  98 static void SYSTEM_StopTicks(void)
  99 {
 100     if (SYS_thread)
 101     {
 102         CancelWaitableTimer( SYS_timer );
 103         TerminateThread( SYS_thread, 0 );
 104         CloseHandle( SYS_thread );
 105         CloseHandle( SYS_timer );
 106         SYS_thread = 0;
 107     }
 108 }
 109
 110
 111 /***********************************************************************
 112  *           InquireSystem   (SYSTEM.1)
 113  *
 114  * Note: the function always takes 2 WORD arguments, contrary to what
 115  *       "Undocumented Windows" says.
 116   */
 117 DWORD WINAPI InquireSystem16( WORD code, WORD arg )
 118 {
 119     WORD drivetype;
 120
 121     switch(code)
 122     {
 123     case 0:  /* Get timer resolution */
 124         return SYS_TIMER_RATE;
 125
 126     case 1:  /* Get drive type */
 127         drivetype = GetDriveType16( arg );
 128         return MAKELONG( drivetype, drivetype );
 129
 130     case 2:  /* Enable one-drive logic */
 131         FIXME("Case %d: set single-drive %d not supported\n", code, arg );
 132         return 0;
 133     }
 134     WARN("Unknown code %d\n", code );
 135     return 0;
 136 }
 137
 138
 139 /***********************************************************************
 140  *           CreateSystemTimer   (SYSTEM.2)
 141  */
 142 WORD WINAPI CreateSystemTimer( WORD rate, SYSTEMTIMERPROC callback )
 143 {
 144     int i;
 145     for (i = 0; i < NB_SYS_TIMERS; i++)
 146         if (!SYS_Timers[i].callback)  /* Found one */
 147         {
 148             SYS_Timers[i].rate = (UINT)rate * 1000;
 149             if (SYS_Timers[i].rate < SYS_TIMER_RATE)
 150                 SYS_Timers[i].rate = SYS_TIMER_RATE;
 151             SYS_Timers[i].ticks = SYS_Timers[i].rate;
 152             SYS_Timers[i].callback = callback;
 153             if (++SYS_NbTimers == 1) SYSTEM_StartTicks();
 154             return i + 1;  /* 0 means error */
 155         }
 156     return 0;
 157 }
 158
 159 /**********************************************************************/
 160
 161 static void call_timer_proc16( WORD timer )
 162 {
 163     CONTEXT86 context;
 164     FARPROC16 proc = SYS_Timers[timer-1].callback16;
 165
 166     memset( &context, '\0', sizeof(context) );
 167
 168     context.SegCs = SELECTOROF( proc );
 169     context.Eip   = OFFSETOF( proc );
 170     context.Ebp   = OFFSETOF( NtCurrentTeb()->cur_stack )
 171                           + (WORD)&((STACK16FRAME*)0)->bp;
 172
 173     AX_reg( &context ) = timer;
 174
 175     wine_call_to_16_regs_short( &context, 0 );
 176 }
 177
 178 /**********************************************************************/
 179
 180 WORD WINAPI WIN16_CreateSystemTimer( WORD rate, FARPROC16 proc )
 181 {
 182     WORD ret = CreateSystemTimer( rate, call_timer_proc16 );
 183     if (ret) SYS_Timers[ret - 1].callback16 = proc;
 184     return ret;
 185 }
 186
 187
 188 /***********************************************************************
 189  *           KillSystemTimer   (SYSTEM.3)
 190  *
 191  * Note: do not confuse this function with USER.182
 192  */
 193 WORD WINAPI SYSTEM_KillSystemTimer( WORD timer )
 194 {
 195     if ( !timer || timer > NB_SYS_TIMERS || !SYS_Timers[timer-1].callback )
 196         return timer;  /* Error */
 197     SYS_Timers[timer-1].callback = NULL;
 198     if (!--SYS_NbTimers) SYSTEM_StopTicks();
 199     return 0;
 200 }
 201
 202
 203 /***********************************************************************
 204  *           EnableSystemTimers   (SYSTEM.4)
 205  */
 206 void WINAPI EnableSystemTimers16(void)
 207 {
 208     SYS_timers_disabled = 0;
 209 }
 210
 211
 212 /***********************************************************************
 213  *           DisableSystemTimers   (SYSTEM.5)
 214  */
 215 void WINAPI DisableSystemTimers16(void)
 216 {
 217     SYS_timers_disabled = 1;
 218 }
 219
 220
 221 /***********************************************************************
 222  *           Get80x87SaveSize   (SYSTEM.7)
 223  */
 224 WORD WINAPI Get80x87SaveSize16(void)
 225 {
 226     return 94;
 227 }
 228
 229
 230 /***********************************************************************
 231  *           Save80x87State   (SYSTEM.8)
 232  */
 233 void WINAPI Save80x87State16( char *ptr )
 234 {
 235 #ifdef __i386__
 236     __asm__(".byte 0x66; fsave %0; fwait" : "=m" (ptr) );
 237 #endif
 238 }
 239
 240
 241 /***********************************************************************
 242  *           Restore80x87State   (SYSTEM.9)
 243  */
 244 void WINAPI Restore80x87State16( const char *ptr )
 245 {
 246 #ifdef __i386__
 247     __asm__(".byte 0x66; frstor %0" : : "m" (ptr) );
 248 #endif
 249 }
 250