4 * Copyright 1996 Alexandre Julliard
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.
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.
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
21 #define NONAMELESSUNION
22 #define NONAMELESSSTRUCT
28 #include "wine/winbase16.h"
29 #include "wine/winuser16.h"
32 #include "wine/debug.h"
34 WINE_DEFAULT_DEBUG_CHANNEL(system);
38 SYSTEMTIMERPROC callback; /* NULL if not in use */
44 #define NB_SYS_TIMERS 8
45 #define SYS_TIMER_RATE 54925
47 static SYSTEM_TIMER SYS_Timers[NB_SYS_TIMERS];
48 static int SYS_NbTimers = 0;
49 static HANDLE SYS_timer;
50 static HANDLE SYS_thread;
51 static int SYS_timers_disabled;
53 /***********************************************************************
56 static void CALLBACK SYSTEM_TimerTick( LPVOID arg, DWORD low, DWORD high )
60 if (SYS_timers_disabled) return;
61 for (i = 0; i < NB_SYS_TIMERS; i++)
63 if (!SYS_Timers[i].callback) continue;
64 if ((SYS_Timers[i].ticks -= SYS_TIMER_RATE) <= 0)
66 SYS_Timers[i].ticks += SYS_Timers[i].rate;
67 SYS_Timers[i].callback( i+1 );
73 /***********************************************************************
76 static DWORD CALLBACK SYSTEM_TimerThread( void *dummy )
80 if (!(SYS_timer = CreateWaitableTimerA( NULL, FALSE, NULL ))) return 0;
82 when.u.LowPart = when.u.HighPart = 0;
83 SetWaitableTimer( SYS_timer, &when, (SYS_TIMER_RATE+500)/1000, SYSTEM_TimerTick, 0, FALSE );
84 for (;;) SleepEx( INFINITE, TRUE );
88 /**********************************************************************
91 * Start the system tick timer.
93 static void SYSTEM_StartTicks(void)
95 if (!SYS_thread) SYS_thread = CreateThread( NULL, 0, SYSTEM_TimerThread, NULL, 0, NULL );
99 /**********************************************************************
102 * Stop the system tick timer.
104 static void SYSTEM_StopTicks(void)
108 CancelWaitableTimer( SYS_timer );
109 TerminateThread( SYS_thread, 0 );
110 CloseHandle( SYS_thread );
111 CloseHandle( SYS_timer );
117 /***********************************************************************
118 * InquireSystem (SYSTEM.1)
120 * Note: the function always takes 2 WORD arguments, contrary to what
121 * "Undocumented Windows" says.
123 DWORD WINAPI InquireSystem16( WORD code, WORD arg )
129 case 0: /* Get timer resolution */
130 return SYS_TIMER_RATE;
132 case 1: /* Get drive type */
133 drivetype = GetDriveType16( arg );
134 return MAKELONG( drivetype, drivetype );
136 case 2: /* Enable one-drive logic */
137 FIXME("Case %d: set single-drive %d not supported\n", code, arg );
140 WARN("Unknown code %d\n", code );
145 /***********************************************************************
146 * CreateSystemTimer (SYSTEM.2)
148 WORD WINAPI CreateSystemTimer( WORD rate, SYSTEMTIMERPROC callback )
151 for (i = 0; i < NB_SYS_TIMERS; i++)
152 if (!SYS_Timers[i].callback) /* Found one */
154 SYS_Timers[i].rate = (UINT)rate * 1000;
155 if (SYS_Timers[i].rate < SYS_TIMER_RATE)
156 SYS_Timers[i].rate = SYS_TIMER_RATE;
157 SYS_Timers[i].ticks = SYS_Timers[i].rate;
158 SYS_Timers[i].callback = callback;
159 if (++SYS_NbTimers == 1) SYSTEM_StartTicks();
160 return i + 1; /* 0 means error */
165 /**********************************************************************/
167 static void call_timer_proc16( WORD timer )
170 FARPROC16 proc = SYS_Timers[timer-1].callback16;
172 memset( &context, 0, sizeof(context) );
174 context.SegFs = wine_get_fs();
175 context.SegGs = wine_get_gs();
176 context.SegCs = SELECTOROF( proc );
177 context.Eip = OFFSETOF( proc );
178 context.Ebp = OFFSETOF(NtCurrentTeb()->WOW32Reserved) + (WORD)&((STACK16FRAME*)0)->bp;
181 WOWCallback16Ex( 0, WCB16_REGS, 0, NULL, (DWORD *)&context );
184 /**********************************************************************/
186 WORD WINAPI WIN16_CreateSystemTimer( WORD rate, FARPROC16 proc )
188 WORD ret = CreateSystemTimer( rate, call_timer_proc16 );
189 if (ret) SYS_Timers[ret - 1].callback16 = proc;
194 /***********************************************************************
195 * KillSystemTimer (SYSTEM.3)
197 * Note: do not confuse this function with USER.182
199 WORD WINAPI SYSTEM_KillSystemTimer( WORD timer )
201 if ( !timer || timer > NB_SYS_TIMERS || !SYS_Timers[timer-1].callback )
202 return timer; /* Error */
203 SYS_Timers[timer-1].callback = NULL;
204 if (!--SYS_NbTimers) SYSTEM_StopTicks();
209 /***********************************************************************
210 * EnableSystemTimers (SYSTEM.4)
212 void WINAPI EnableSystemTimers16(void)
214 SYS_timers_disabled = 0;
218 /***********************************************************************
219 * DisableSystemTimers (SYSTEM.5)
221 void WINAPI DisableSystemTimers16(void)
223 SYS_timers_disabled = 1;
227 /***********************************************************************
228 * GetSystemMSecCount (SYSTEM.6)
230 DWORD WINAPI GetSystemMSecCount16(void)
232 return GetTickCount();
236 /***********************************************************************
237 * Get80x87SaveSize (SYSTEM.7)
239 WORD WINAPI Get80x87SaveSize16(void)
245 /***********************************************************************
246 * Save80x87State (SYSTEM.8)
248 void WINAPI Save80x87State16( char *ptr )
251 __asm__(".byte 0x66; fsave %0; fwait" : "=m" (ptr) );
256 /***********************************************************************
257 * Restore80x87State (SYSTEM.9)
259 void WINAPI Restore80x87State16( const char *ptr )
262 __asm__(".byte 0x66; frstor %0" : : "m" (ptr) );
267 /***********************************************************************
268 * A20_Proc (SYSTEM.20)
270 void WINAPI A20_Proc16( WORD unused )
272 /* this is also a NOP in Windows */