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 "winternl.h"
  32 #include "kernel_private.h"
  33 #include "kernel16_private.h"
  34 #include "wine/debug.h"
  35
  36 WINE_DEFAULT_DEBUG_CHANNEL(system);
  37
  38 typedef struct
  39 {
  40     SYSTEMTIMERPROC callback;  /* NULL if not in use */
  41     FARPROC16       callback16;
  42     INT             rate;
  43     INT             ticks;
  44 } SYSTEM_TIMER;
  45
  46 #define NB_SYS_TIMERS   8
  47 #define SYS_TIMER_RATE  54925
  48
  49 static SYSTEM_TIMER SYS_Timers[NB_SYS_TIMERS];
  50 static int SYS_NbTimers = 0;
  51 static HANDLE SYS_timer;
  52 static HANDLE SYS_thread;
  53 static int SYS_timers_disabled;
  54
  55 /***********************************************************************
  56  *           SYSTEM_TimerTick
  57  */
  58 static void CALLBACK SYSTEM_TimerTick( LPVOID arg, DWORD low, DWORD high )
  59 {
  60     int i;
  61
  62     if (SYS_timers_disabled) return;
  63     for (i = 0; i < NB_SYS_TIMERS; i++)
  64     {
  65         if (!SYS_Timers[i].callback) continue;
  66         if ((SYS_Timers[i].ticks -= SYS_TIMER_RATE) <= 0)
  67         {
  68             SYS_Timers[i].ticks += SYS_Timers[i].rate;
  69             SYS_Timers[i].callback( i+1 );
  70         }
  71     }
  72 }
  73
  74
  75 /***********************************************************************
  76  *           SYSTEM_TimerThread
  77  */
  78 static DWORD CALLBACK SYSTEM_TimerThread( void *dummy )
  79 {
  80     LARGE_INTEGER when;
  81
  82     if (!(SYS_timer = CreateWaitableTimerA( NULL, FALSE, NULL ))) return 0;
  83
  84     when.u.LowPart = when.u.HighPart = 0;
  85     SetWaitableTimer( SYS_timer, &when, (SYS_TIMER_RATE+500)/1000, SYSTEM_TimerTick, 0, FALSE );
  86     for (;;) SleepEx( INFINITE, TRUE );
  87 }
  88
  89
  90 /**********************************************************************
  91  *           SYSTEM_StartTicks
  92  *
  93  * Start the system tick timer.
  94  */
  95 static void SYSTEM_StartTicks(void)
  96 {
  97     if (!SYS_thread) SYS_thread = CreateThread( NULL, 0, SYSTEM_TimerThread, NULL, 0, NULL );
  98 }
  99
 100
 101 /**********************************************************************
 102  *           SYSTEM_StopTicks
 103  *
 104  * Stop the system tick timer.
 105  */
 106 static void SYSTEM_StopTicks(void)
 107 {
 108     if (SYS_thread)
 109     {
 110         CancelWaitableTimer( SYS_timer );
 111         TerminateThread( SYS_thread, 0 );
 112         CloseHandle( SYS_thread );
 113         CloseHandle( SYS_timer );
 114         SYS_thread = 0;
 115     }
 116 }
 117
 118
 119 /***********************************************************************
 120  *           InquireSystem   (SYSTEM.1)
 121  *
 122  * Note: the function always takes 2 WORD arguments, contrary to what
 123  *       "Undocumented Windows" says.
 124   */
 125 DWORD WINAPI InquireSystem16( WORD code, WORD arg )
 126 {
 127     WORD drivetype;
 128
 129     switch(code)
 130     {
 131     case 0:  /* Get timer resolution */
 132         return SYS_TIMER_RATE;
 133
 134     case 1:  /* Get drive type */
 135         drivetype = GetDriveType16( arg );
 136         return MAKELONG( drivetype, drivetype );
 137
 138     case 2:  /* Enable one-drive logic */
 139         FIXME("Case %d: set single-drive %d not supported\n", code, arg );
 140         return 0;
 141     }
 142     WARN("Unknown code %d\n", code );
 143     return 0;
 144 }
 145
 146
 147 /***********************************************************************
 148  *           CreateSystemTimer   (SYSTEM.2)
 149  */
 150 WORD WINAPI CreateSystemTimer( WORD rate, SYSTEMTIMERPROC callback )
 151 {
 152     int i;
 153     for (i = 0; i < NB_SYS_TIMERS; i++)
 154         if (!SYS_Timers[i].callback)  /* Found one */
 155         {
 156             SYS_Timers[i].rate = (UINT)rate * 1000;
 157             if (SYS_Timers[i].rate < SYS_TIMER_RATE)
 158                 SYS_Timers[i].rate = SYS_TIMER_RATE;
 159             SYS_Timers[i].ticks = SYS_Timers[i].rate;
 160             SYS_Timers[i].callback = callback;
 161             if (++SYS_NbTimers == 1) SYSTEM_StartTicks();
 162             return i + 1;  /* 0 means error */
 163         }
 164     return 0;
 165 }
 166
 167 /**********************************************************************/
 168
 169 static void call_timer_proc16( WORD timer )
 170 {
 171     CONTEXT86 context;
 172     FARPROC16 proc = SYS_Timers[timer-1].callback16;
 173
 174     memset( &context, 0, sizeof(context) );
 175
 176     context.SegFs = wine_get_fs();
 177     context.SegGs = wine_get_gs();
 178     context.SegCs = SELECTOROF( proc );
 179     context.Eip   = OFFSETOF( proc );
 180     context.Ebp   = OFFSETOF(NtCurrentTeb()->WOW32Reserved) + (WORD)&((STACK16FRAME*)0)->bp;
 181     context.Eax   = timer;
 182
 183     WOWCallback16Ex( 0, WCB16_REGS, 0, NULL, (DWORD *)&context );
 184 }
 185
 186 /**********************************************************************/
 187
 188 WORD WINAPI WIN16_CreateSystemTimer( WORD rate, FARPROC16 proc )
 189 {
 190     WORD ret = CreateSystemTimer( rate, call_timer_proc16 );
 191     if (ret) SYS_Timers[ret - 1].callback16 = proc;
 192     return ret;
 193 }
 194
 195
 196 /***********************************************************************
 197  *           KillSystemTimer   (SYSTEM.3)
 198  *
 199  * Note: do not confuse this function with USER.182
 200  */
 201 WORD WINAPI SYSTEM_KillSystemTimer( WORD timer )
 202 {
 203     if ( !timer || timer > NB_SYS_TIMERS || !SYS_Timers[timer-1].callback )
 204         return timer;  /* Error */
 205     SYS_Timers[timer-1].callback = NULL;
 206     if (!--SYS_NbTimers) SYSTEM_StopTicks();
 207     return 0;
 208 }
 209
 210
 211 /***********************************************************************
 212  *           EnableSystemTimers   (SYSTEM.4)
 213  */
 214 void WINAPI EnableSystemTimers16(void)
 215 {
 216     SYS_timers_disabled = 0;
 217 }
 218
 219
 220 /***********************************************************************
 221  *           DisableSystemTimers   (SYSTEM.5)
 222  */
 223 void WINAPI DisableSystemTimers16(void)
 224 {
 225     SYS_timers_disabled = 1;
 226 }
 227
 228
 229 /***********************************************************************
 230  *           Get80x87SaveSize   (SYSTEM.7)
 231  */
 232 WORD WINAPI Get80x87SaveSize16(void)
 233 {
 234     return 94;
 235 }
 236
 237
 238 /***********************************************************************
 239  *           Save80x87State   (SYSTEM.8)
 240  */
 241 void WINAPI Save80x87State16( char *ptr )
 242 {
 243 #ifdef __i386__
 244     __asm__(".byte 0x66; fsave %0; fwait" : "=m" (ptr) );
 245 #endif
 246 }
 247
 248
 249 /***********************************************************************
 250  *           Restore80x87State   (SYSTEM.9)
 251  */
 252 void WINAPI Restore80x87State16( const char *ptr )
 253 {
 254 #ifdef __i386__
 255     __asm__(".byte 0x66; frstor %0" : : "m" (ptr) );
 256 #endif
 257 }