dlls/kernel32/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
 126     switch(code)
 127     {
 128     case 0:  /* Get timer resolution */
 129         return SYS_TIMER_RATE;
 130
 131     case 1:  /* Get drive type */
 132         drivetype = GetDriveType16( arg );
 133         return MAKELONG( drivetype, drivetype );
 134
 135     case 2:  /* Enable one-drive logic */
 136         FIXME("Case %d: set single-drive %d not supported\n", code, arg );
 137         return 0;
 138     }
 139     WARN("Unknown code %d\n", code );
 140     return 0;
 141 }
 142
 143
 144 /***********************************************************************
 145  *           CreateSystemTimer   (SYSTEM.2)
 146  */
 147 WORD WINAPI CreateSystemTimer( WORD rate, SYSTEMTIMERPROC callback )
 148 {
 149     int i;
 150     for (i = 0; i < NB_SYS_TIMERS; i++)
 151         if (!SYS_Timers[i].callback)  /* Found one */
 152         {
 153             SYS_Timers[i].rate = (UINT)rate * 1000;
 154             if (SYS_Timers[i].rate < SYS_TIMER_RATE)
 155                 SYS_Timers[i].rate = SYS_TIMER_RATE;
 156             SYS_Timers[i].ticks = SYS_Timers[i].rate;
 157             SYS_Timers[i].callback = callback;
 158             if (++SYS_NbTimers == 1) SYSTEM_StartTicks();
 159             return i + 1;  /* 0 means error */
 160         }
 161     return 0;
 162 }
 163
 164 /**********************************************************************/
 165
 166 static void call_timer_proc16( WORD timer )
 167 {
 168     CONTEXT86 context;
 169     FARPROC16 proc = SYS_Timers[timer-1].callback16;
 170
 171     memset( &context, 0, sizeof(context) );
 172
 173     context.SegFs = wine_get_fs();
 174     context.SegGs = wine_get_gs();
 175     context.SegCs = SELECTOROF( proc );
 176     context.Eip   = OFFSETOF( proc );
 177     context.Ebp   = OFFSETOF(NtCurrentTeb()->WOW32Reserved) + (WORD)&((STACK16FRAME*)0)->bp;
 178     context.Eax   = timer;
 179
 180     WOWCallback16Ex( 0, WCB16_REGS, 0, NULL, (DWORD *)&context );
 181 }
 182
 183 /**********************************************************************/
 184
 185 WORD WINAPI WIN16_CreateSystemTimer( WORD rate, FARPROC16 proc )
 186 {
 187     WORD ret = CreateSystemTimer( rate, call_timer_proc16 );
 188     if (ret) SYS_Timers[ret - 1].callback16 = proc;
 189     return ret;
 190 }
 191
 192
 193 /***********************************************************************
 194  *           KillSystemTimer   (SYSTEM.3)
 195  *
 196  * Note: do not confuse this function with USER.182
 197  */
 198 WORD WINAPI SYSTEM_KillSystemTimer( WORD timer )
 199 {
 200     if ( !timer || timer > NB_SYS_TIMERS || !SYS_Timers[timer-1].callback )
 201         return timer;  /* Error */
 202     SYS_Timers[timer-1].callback = NULL;
 203     if (!--SYS_NbTimers) SYSTEM_StopTicks();
 204     return 0;
 205 }
 206
 207
 208 /***********************************************************************
 209  *           EnableSystemTimers   (SYSTEM.4)
 210  */
 211 void WINAPI EnableSystemTimers16(void)
 212 {
 213     SYS_timers_disabled = 0;
 214 }
 215
 216
 217 /***********************************************************************
 218  *           DisableSystemTimers   (SYSTEM.5)
 219  */
 220 void WINAPI DisableSystemTimers16(void)
 221 {
 222     SYS_timers_disabled = 1;
 223 }
 224
 225
 226 /***********************************************************************
 227  *           GetSystemMSecCount (SYSTEM.6)
 228  */
 229 DWORD WINAPI GetSystemMSecCount16(void)
 230 {
 231     return GetTickCount();
 232 }
 233
 234
 235 /***********************************************************************
 236  *           Get80x87SaveSize   (SYSTEM.7)
 237  */
 238 WORD WINAPI Get80x87SaveSize16(void)
 239 {
 240     return 94;
 241 }
 242
 243
 244 /***********************************************************************
 245  *           Save80x87State   (SYSTEM.8)
 246  */
 247 void WINAPI Save80x87State16( char *ptr )
 248 {
 249 #ifdef __i386__
 250     __asm__(".byte 0x66; fsave %0; fwait" : "=m" (ptr) );
 251 #endif
 252 }
 253
 254
 255 /***********************************************************************
 256  *           Restore80x87State   (SYSTEM.9)
 257  */
 258 void WINAPI Restore80x87State16( const char *ptr )
 259 {
 260 #ifdef __i386__
 261     __asm__(".byte 0x66; frstor %0" : : "m" (ptr) );
 262 #endif
 263 }
 264
 265
 266 /***********************************************************************
 267  *           A20_Proc  (SYSTEM.20)
 268  */
 269 void WINAPI A20_Proc16( WORD unused )
 270 {
 271     /* this is also a NOP in Windows */
 272 }