dlls/system.drv16/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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 #define NONAMELESSUNION
  22 #define NONAMELESSSTRUCT
  23 #include <stdarg.h>
  24
  25 #include "windef.h"
  26 #include "winbase.h"
  27 #include "wine/winbase16.h"
  28 #include "wine/winuser16.h"
  29 #include "wownt32.h"
  30 #include "winternl.h"
  31 #include "wine/debug.h"
  32
  33 WINE_DEFAULT_DEBUG_CHANNEL(system);
  34
  35 typedef struct
  36 {
  37     SYSTEMTIMERPROC callback;  /* NULL if not in use */
  38     FARPROC16       callback16;
  39     INT             rate;
  40     INT             ticks;
  41 } SYSTEM_TIMER;
  42
  43 #define NB_SYS_TIMERS   8
  44 #define SYS_TIMER_RATE  54925
  45
  46 static SYSTEM_TIMER SYS_Timers[NB_SYS_TIMERS];
  47 static int SYS_NbTimers = 0;
  48 static HANDLE SYS_timer;
  49 static HANDLE SYS_thread;
  50 static int SYS_timers_disabled;
  51
  52 /***********************************************************************
  53  *           SYSTEM_TimerTick
  54  */
  55 static void CALLBACK SYSTEM_TimerTick( LPVOID arg, DWORD low, DWORD high )
  56 {
  57     int i;
  58
  59     if (SYS_timers_disabled) return;
  60     for (i = 0; i < NB_SYS_TIMERS; i++)
  61     {
  62         if (!SYS_Timers[i].callback) continue;
  63         if ((SYS_Timers[i].ticks -= SYS_TIMER_RATE) <= 0)
  64         {
  65             SYS_Timers[i].ticks += SYS_Timers[i].rate;
  66             SYS_Timers[i].callback( i+1 );
  67         }
  68     }
  69 }
  70
  71
  72 /***********************************************************************
  73  *           SYSTEM_TimerThread
  74  */
  75 static DWORD CALLBACK SYSTEM_TimerThread( void *dummy )
  76 {
  77     LARGE_INTEGER when;
  78
  79     if (!(SYS_timer = CreateWaitableTimerA( NULL, FALSE, NULL ))) return 0;
  80
  81     when.u.LowPart = when.u.HighPart = 0;
  82     SetWaitableTimer( SYS_timer, &when, (SYS_TIMER_RATE+500)/1000, SYSTEM_TimerTick, 0, FALSE );
  83     for (;;) SleepEx( INFINITE, TRUE );
  84 }
  85
  86
  87 /**********************************************************************
  88  *           SYSTEM_StartTicks
  89  *
  90  * Start the system tick timer.
  91  */
  92 static void SYSTEM_StartTicks(void)
  93 {
  94     if (!SYS_thread) SYS_thread = CreateThread( NULL, 0, SYSTEM_TimerThread, NULL, 0, NULL );
  95 }
  96
  97
  98 /**********************************************************************
  99  *           SYSTEM_StopTicks
 100  *
 101  * Stop the system tick timer.
 102  */
 103 static void SYSTEM_StopTicks(void)
 104 {
 105     if (SYS_thread)
 106     {
 107         CancelWaitableTimer( SYS_timer );
 108         TerminateThread( SYS_thread, 0 );
 109         CloseHandle( SYS_thread );
 110         CloseHandle( SYS_timer );
 111         SYS_thread = 0;
 112     }
 113 }
 114
 115
 116 /***********************************************************************
 117  *           InquireSystem   (SYSTEM.1)
 118  *
 119  * Note: the function always takes 2 WORD arguments, contrary to what
 120  *       "Undocumented Windows" says.
 121   */
 122 DWORD WINAPI InquireSystem16( WORD code, WORD arg )
 123 {
 124     WORD drivetype;
 125     WCHAR root[3];
 126
 127     switch(code)
 128     {
 129     case 0:  /* Get timer resolution */
 130         return SYS_TIMER_RATE;
 131
 132     case 1:  /* Get drive type */
 133         root[0] = 'A' + arg;
 134         root[1] = ':';
 135         root[2] = 0;
 136         drivetype = GetDriveTypeW( root );
 137         if (drivetype == DRIVE_CDROM) drivetype = DRIVE_REMOTE;
 138         else if (drivetype == DRIVE_NO_ROOT_DIR) drivetype = DRIVE_UNKNOWN;
 139         return MAKELONG( drivetype, drivetype );
 140
 141     case 2:  /* Enable one-drive logic */
 142         FIXME("Case %d: set single-drive %d not supported\n", code, arg );
 143         return 0;
 144     }
 145     WARN("Unknown code %d\n", code );
 146     return 0;
 147 }
 148
 149
 150 /***********************************************************************
 151  *           CreateSystemTimer   (SYSTEM.2)
 152  */
 153 WORD WINAPI CreateSystemTimer( WORD rate, SYSTEMTIMERPROC callback )
 154 {
 155     int i;
 156     for (i = 0; i < NB_SYS_TIMERS; i++)
 157         if (!SYS_Timers[i].callback)  /* Found one */
 158         {
 159             SYS_Timers[i].rate = (UINT)rate * 1000;
 160             if (SYS_Timers[i].rate < SYS_TIMER_RATE)
 161                 SYS_Timers[i].rate = SYS_TIMER_RATE;
 162             SYS_Timers[i].ticks = SYS_Timers[i].rate;
 163             SYS_Timers[i].callback = callback;
 164             if (++SYS_NbTimers == 1) SYSTEM_StartTicks();
 165             return i + 1;  /* 0 means error */
 166         }
 167     return 0;
 168 }
 169
 170 /**********************************************************************/
 171
 172 static void call_timer_proc16( WORD timer )
 173 {
 174     CONTEXT86 context;
 175     FARPROC16 proc = SYS_Timers[timer-1].callback16;
 176
 177     memset( &context, 0, sizeof(context) );
 178
 179     context.SegFs = wine_get_fs();
 180     context.SegGs = wine_get_gs();
 181     context.SegCs = SELECTOROF( proc );
 182     context.Eip   = OFFSETOF( proc );
 183     context.Ebp   = OFFSETOF(NtCurrentTeb()->WOW32Reserved) + FIELD_OFFSET(STACK16FRAME,bp);
 184     context.Eax   = timer;
 185
 186     WOWCallback16Ex( 0, WCB16_REGS, 0, NULL, (DWORD *)&context );
 187 }
 188
 189 /**********************************************************************/
 190
 191 WORD WINAPI WIN16_CreateSystemTimer( WORD rate, FARPROC16 proc )
 192 {
 193     WORD ret = CreateSystemTimer( rate, call_timer_proc16 );
 194     if (ret) SYS_Timers[ret - 1].callback16 = proc;
 195     return ret;
 196 }
 197
 198
 199 /***********************************************************************
 200  *           KillSystemTimer   (SYSTEM.3)
 201  *
 202  * Note: do not confuse this function with USER.182
 203  */
 204 WORD WINAPI SYSTEM_KillSystemTimer( WORD timer )
 205 {
 206     if ( !timer || timer > NB_SYS_TIMERS || !SYS_Timers[timer-1].callback )
 207         return timer;  /* Error */
 208     SYS_Timers[timer-1].callback = NULL;
 209     if (!--SYS_NbTimers) SYSTEM_StopTicks();
 210     return 0;
 211 }
 212
 213
 214 /***********************************************************************
 215  *           EnableSystemTimers   (SYSTEM.4)
 216  */
 217 void WINAPI EnableSystemTimers16(void)
 218 {
 219     SYS_timers_disabled = 0;
 220 }
 221
 222
 223 /***********************************************************************
 224  *           DisableSystemTimers   (SYSTEM.5)
 225  */
 226 void WINAPI DisableSystemTimers16(void)
 227 {
 228     SYS_timers_disabled = 1;
 229 }
 230
 231
 232 /***********************************************************************
 233  *           GetSystemMSecCount (SYSTEM.6)
 234  */
 235 DWORD WINAPI GetSystemMSecCount16(void)
 236 {
 237     return GetTickCount();
 238 }
 239
 240
 241 /***********************************************************************
 242  *           Get80x87SaveSize   (SYSTEM.7)
 243  */
 244 WORD WINAPI Get80x87SaveSize16(void)
 245 {
 246     return 94;
 247 }
 248
 249
 250 /***********************************************************************
 251  *           Save80x87State   (SYSTEM.8)
 252  */
 253 void WINAPI Save80x87State16( char *ptr )
 254 {
 255 #ifdef __i386__
 256     __asm__(".byte 0x66; fsave %0; fwait" : "=m" (ptr) );
 257 #endif
 258 }
 259
 260
 261 /***********************************************************************
 262  *           Restore80x87State   (SYSTEM.9)
 263  */
 264 void WINAPI Restore80x87State16( const char *ptr )
 265 {
 266 #ifdef __i386__
 267     __asm__(".byte 0x66; frstor %0" : : "m" (ptr) );
 268 #endif
 269 }
 270
 271
 272 /***********************************************************************
 273  *           A20_Proc  (SYSTEM.20)
 274  */
 275 void WINAPI A20_Proc16( WORD unused )
 276 {
 277     /* this is also a NOP in Windows */
 278 }