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263 lines
6.9 KiB
C
263 lines
6.9 KiB
C
/*
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* SYSTEM DLL routines
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*
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* Copyright 1996 Alexandre Julliard
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#define NONAMELESSUNION
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#define NONAMELESSSTRUCT
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#include <stdarg.h>
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#include "windef.h"
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#include "winbase.h"
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#include "wine/winbase16.h"
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#include "wine/winuser16.h"
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#include "wownt32.h"
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#include "winternl.h"
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#include "wine/debug.h"
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WINE_DEFAULT_DEBUG_CHANNEL(system);
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typedef struct
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{
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FARPROC16 callback16;
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INT rate;
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INT ticks;
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} SYSTEM_TIMER;
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#define NB_SYS_TIMERS 8
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#define SYS_TIMER_RATE 54925
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static SYSTEM_TIMER SYS_Timers[NB_SYS_TIMERS];
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static int SYS_NbTimers = 0;
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static HANDLE SYS_timer;
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static HANDLE SYS_thread;
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static int SYS_timers_disabled;
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/***********************************************************************
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* SYSTEM_TimerTick
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*/
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static void CALLBACK SYSTEM_TimerTick( LPVOID arg, DWORD low, DWORD high )
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{
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int i;
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if (SYS_timers_disabled) return;
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for (i = 0; i < NB_SYS_TIMERS; i++)
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{
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if (!SYS_Timers[i].callback16) continue;
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if ((SYS_Timers[i].ticks -= SYS_TIMER_RATE) <= 0)
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{
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FARPROC16 proc = SYS_Timers[i].callback16;
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CONTEXT context;
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SYS_Timers[i].ticks += SYS_Timers[i].rate;
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memset( &context, 0, sizeof(context) );
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context.SegFs = wine_get_fs();
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context.SegGs = wine_get_gs();
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context.SegCs = SELECTOROF( proc );
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context.Eip = OFFSETOF( proc );
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context.Ebp = OFFSETOF(NtCurrentTeb()->WOW32Reserved) + FIELD_OFFSET(STACK16FRAME, bp);
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context.Eax = i + 1;
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WOWCallback16Ex( 0, WCB16_REGS, 0, NULL, (DWORD *)&context );
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}
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}
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}
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/***********************************************************************
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* SYSTEM_TimerThread
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*/
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static DWORD CALLBACK SYSTEM_TimerThread( void *dummy )
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{
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LARGE_INTEGER when;
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if (!(SYS_timer = CreateWaitableTimerA( NULL, FALSE, NULL ))) return 0;
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when.u.LowPart = when.u.HighPart = 0;
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SetWaitableTimer( SYS_timer, &when, (SYS_TIMER_RATE+500)/1000, SYSTEM_TimerTick, 0, FALSE );
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for (;;) SleepEx( INFINITE, TRUE );
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}
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/**********************************************************************
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* SYSTEM_StartTicks
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*
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* Start the system tick timer.
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*/
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static void SYSTEM_StartTicks(void)
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{
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if (!SYS_thread) SYS_thread = CreateThread( NULL, 0, SYSTEM_TimerThread, NULL, 0, NULL );
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}
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/**********************************************************************
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* SYSTEM_StopTicks
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*
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* Stop the system tick timer.
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*/
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static void SYSTEM_StopTicks(void)
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{
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if (SYS_thread)
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{
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CancelWaitableTimer( SYS_timer );
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TerminateThread( SYS_thread, 0 );
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CloseHandle( SYS_thread );
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CloseHandle( SYS_timer );
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SYS_thread = 0;
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}
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}
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/***********************************************************************
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* InquireSystem (SYSTEM.1)
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*
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* Note: the function always takes 2 WORD arguments, contrary to what
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* "Undocumented Windows" says.
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*/
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DWORD WINAPI InquireSystem16( WORD code, WORD arg )
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{
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WORD drivetype;
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WCHAR root[3];
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switch(code)
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{
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case 0: /* Get timer resolution */
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return SYS_TIMER_RATE;
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case 1: /* Get drive type */
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root[0] = 'A' + arg;
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root[1] = ':';
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root[2] = 0;
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drivetype = GetDriveTypeW( root );
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if (drivetype == DRIVE_CDROM) drivetype = DRIVE_REMOTE;
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else if (drivetype == DRIVE_NO_ROOT_DIR) drivetype = DRIVE_UNKNOWN;
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return MAKELONG( drivetype, drivetype );
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case 2: /* Enable one-drive logic */
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FIXME("Case %d: set single-drive %d not supported\n", code, arg );
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return 0;
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}
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WARN("Unknown code %d\n", code );
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return 0;
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}
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/***********************************************************************
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* CreateSystemTimer (SYSTEM.2)
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*/
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WORD WINAPI CreateSystemTimer16( WORD rate, FARPROC16 proc )
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{
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int i;
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for (i = 0; i < NB_SYS_TIMERS; i++)
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if (!SYS_Timers[i].callback16) /* Found one */
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{
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SYS_Timers[i].rate = (UINT)rate * 1000;
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if (SYS_Timers[i].rate < SYS_TIMER_RATE)
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SYS_Timers[i].rate = SYS_TIMER_RATE;
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SYS_Timers[i].ticks = SYS_Timers[i].rate;
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SYS_Timers[i].callback16 = proc;
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if (++SYS_NbTimers == 1) SYSTEM_StartTicks();
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return i + 1; /* 0 means error */
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}
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return 0;
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}
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/***********************************************************************
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* KillSystemTimer (SYSTEM.3)
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*
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* Note: do not confuse this function with USER.182
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*/
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WORD WINAPI SYSTEM_KillSystemTimer( WORD timer )
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{
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if ( !timer || timer > NB_SYS_TIMERS || !SYS_Timers[timer-1].callback16 )
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return timer; /* Error */
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SYS_Timers[timer-1].callback16 = 0;
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if (!--SYS_NbTimers) SYSTEM_StopTicks();
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return 0;
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}
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/***********************************************************************
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* EnableSystemTimers (SYSTEM.4)
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*/
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void WINAPI EnableSystemTimers16(void)
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{
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SYS_timers_disabled = 0;
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}
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/***********************************************************************
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* DisableSystemTimers (SYSTEM.5)
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*/
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void WINAPI DisableSystemTimers16(void)
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{
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SYS_timers_disabled = 1;
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}
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/***********************************************************************
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* GetSystemMSecCount (SYSTEM.6)
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*/
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DWORD WINAPI GetSystemMSecCount16(void)
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{
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return GetTickCount();
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}
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/***********************************************************************
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* Get80x87SaveSize (SYSTEM.7)
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*/
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WORD WINAPI Get80x87SaveSize16(void)
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{
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return 94;
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}
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/***********************************************************************
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* Save80x87State (SYSTEM.8)
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*/
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void WINAPI Save80x87State16( char *ptr )
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{
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#ifdef __i386__
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__asm__(".byte 0x66; fsave %0; fwait" : "=m" (ptr) );
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#endif
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}
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/***********************************************************************
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* Restore80x87State (SYSTEM.9)
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*/
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void WINAPI Restore80x87State16( const char *ptr )
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{
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#ifdef __i386__
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__asm__(".byte 0x66; frstor %0" : : "m" (ptr) );
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#endif
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}
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/***********************************************************************
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* A20_Proc (SYSTEM.20)
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*/
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void WINAPI A20_Proc16( WORD unused )
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{
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/* this is also a NOP in Windows */
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}
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