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
25 #include "wine/winbase16.h"
26 #include "wine/winuser16.h"
27 #include "stackframe.h"
28 #include "wine/debug.h"
30 WINE_DEFAULT_DEBUG_CHANNEL(system);
34 SYSTEMTIMERPROC callback; /* NULL if not in use */
40 #define NB_SYS_TIMERS 8
41 #define SYS_TIMER_RATE 54925
43 static SYSTEM_TIMER SYS_Timers[NB_SYS_TIMERS];
44 static int SYS_NbTimers = 0;
45 static HANDLE SYS_timer;
46 static HANDLE SYS_thread;
47 static int SYS_timers_disabled;
49 /***********************************************************************
52 static void CALLBACK SYSTEM_TimerTick( LPVOID arg, DWORD low, DWORD high )
56 if (SYS_timers_disabled) return;
57 for (i = 0; i < NB_SYS_TIMERS; i++)
59 if (!SYS_Timers[i].callback) continue;
60 if ((SYS_Timers[i].ticks -= SYS_TIMER_RATE) <= 0)
62 SYS_Timers[i].ticks += SYS_Timers[i].rate;
63 SYS_Timers[i].callback( i+1 );
69 /***********************************************************************
72 static DWORD CALLBACK SYSTEM_TimerThread( void *dummy )
76 if (!(SYS_timer = CreateWaitableTimerA( NULL, FALSE, NULL ))) return 0;
78 when.s.LowPart = when.s.HighPart = 0;
79 SetWaitableTimer( SYS_timer, &when, (SYS_TIMER_RATE+500)/1000, SYSTEM_TimerTick, 0, FALSE );
80 for (;;) WaitForMultipleObjectsEx( 0, NULL, FALSE, INFINITE, TRUE );
84 /**********************************************************************
87 * Start the system tick timer.
89 static void SYSTEM_StartTicks(void)
91 if (!SYS_thread) SYS_thread = CreateThread( NULL, 0, SYSTEM_TimerThread, NULL, 0, NULL );
95 /**********************************************************************
98 * Stop the system tick timer.
100 static void SYSTEM_StopTicks(void)
104 CancelWaitableTimer( SYS_timer );
105 TerminateThread( SYS_thread, 0 );
106 CloseHandle( SYS_thread );
107 CloseHandle( SYS_timer );
113 /***********************************************************************
114 * InquireSystem (SYSTEM.1)
116 * Note: the function always takes 2 WORD arguments, contrary to what
117 * "Undocumented Windows" says.
119 DWORD WINAPI InquireSystem16( WORD code, WORD arg )
125 case 0: /* Get timer resolution */
126 return SYS_TIMER_RATE;
128 case 1: /* Get drive type */
129 drivetype = GetDriveType16( arg );
130 return MAKELONG( drivetype, drivetype );
132 case 2: /* Enable one-drive logic */
133 FIXME("Case %d: set single-drive %d not supported\n", code, arg );
136 WARN("Unknown code %d\n", code );
141 /***********************************************************************
142 * CreateSystemTimer (SYSTEM.2)
144 WORD WINAPI CreateSystemTimer( WORD rate, SYSTEMTIMERPROC callback )
147 for (i = 0; i < NB_SYS_TIMERS; i++)
148 if (!SYS_Timers[i].callback) /* Found one */
150 SYS_Timers[i].rate = (UINT)rate * 1000;
151 if (SYS_Timers[i].rate < SYS_TIMER_RATE)
152 SYS_Timers[i].rate = SYS_TIMER_RATE;
153 SYS_Timers[i].ticks = SYS_Timers[i].rate;
154 SYS_Timers[i].callback = callback;
155 if (++SYS_NbTimers == 1) SYSTEM_StartTicks();
156 return i + 1; /* 0 means error */
161 /**********************************************************************/
163 static void call_timer_proc16( WORD timer )
166 FARPROC16 proc = SYS_Timers[timer-1].callback16;
168 memset( &context, '\0', sizeof(context) );
170 context.SegCs = SELECTOROF( proc );
171 context.Eip = OFFSETOF( proc );
172 context.Ebp = OFFSETOF( NtCurrentTeb()->cur_stack )
173 + (WORD)&((STACK16FRAME*)0)->bp;
176 wine_call_to_16_regs_short( &context, 0 );
179 /**********************************************************************/
181 WORD WINAPI WIN16_CreateSystemTimer( WORD rate, FARPROC16 proc )
183 WORD ret = CreateSystemTimer( rate, call_timer_proc16 );
184 if (ret) SYS_Timers[ret - 1].callback16 = proc;
189 /***********************************************************************
190 * KillSystemTimer (SYSTEM.3)
192 * Note: do not confuse this function with USER.182
194 WORD WINAPI SYSTEM_KillSystemTimer( WORD timer )
196 if ( !timer || timer > NB_SYS_TIMERS || !SYS_Timers[timer-1].callback )
197 return timer; /* Error */
198 SYS_Timers[timer-1].callback = NULL;
199 if (!--SYS_NbTimers) SYSTEM_StopTicks();
204 /***********************************************************************
205 * EnableSystemTimers (SYSTEM.4)
207 void WINAPI EnableSystemTimers16(void)
209 SYS_timers_disabled = 0;
213 /***********************************************************************
214 * DisableSystemTimers (SYSTEM.5)
216 void WINAPI DisableSystemTimers16(void)
218 SYS_timers_disabled = 1;
222 /***********************************************************************
223 * Get80x87SaveSize (SYSTEM.7)
225 WORD WINAPI Get80x87SaveSize16(void)
231 /***********************************************************************
232 * Save80x87State (SYSTEM.8)
234 void WINAPI Save80x87State16( char *ptr )
237 __asm__(".byte 0x66; fsave %0; fwait" : "=m" (ptr) );
242 /***********************************************************************
243 * Restore80x87State (SYSTEM.9)
245 void WINAPI Restore80x87State16( const char *ptr )
248 __asm__(".byte 0x66; frstor %0" : : "m" (ptr) );