diff options
Diffstat (limited to 'board/MAI/bios_emulator/scitech/src/pm/ntdrv/ztimer.c')
-rw-r--r-- | board/MAI/bios_emulator/scitech/src/pm/ntdrv/ztimer.c | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/board/MAI/bios_emulator/scitech/src/pm/ntdrv/ztimer.c b/board/MAI/bios_emulator/scitech/src/pm/ntdrv/ztimer.c new file mode 100644 index 0000000..ef27294 --- /dev/null +++ b/board/MAI/bios_emulator/scitech/src/pm/ntdrv/ztimer.c @@ -0,0 +1,124 @@ +/**************************************************************************** +* +* Ultra Long Period Timer +* +* ======================================================================== +* +* The contents of this file are subject to the SciTech MGL Public +* License Version 1.0 (the "License"); you may not use this file +* except in compliance with the License. You may obtain a copy of +* the License at http://www.scitechsoft.com/mgl-license.txt +* +* Software distributed under the License is distributed on an +* "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or +* implied. See the License for the specific language governing +* rights and limitations under the License. +* +* The Original Code is Copyright (C) 1991-1998 SciTech Software, Inc. +* +* The Initial Developer of the Original Code is SciTech Software, Inc. +* All Rights Reserved. +* +* ======================================================================== +* +* Language: ANSI C +* Environment: 32-bit Windows VxD +* +* Description: OS specific implementation for the Zen Timer functions. +* +****************************************************************************/ + +/*---------------------------- Global variables ---------------------------*/ + +static CPU_largeInteger countFreq; +static ulong start,finish; + +/*----------------------------- Implementation ----------------------------*/ + +/**************************************************************************** +REMARKS: +Initialise the Zen Timer module internals. +****************************************************************************/ +static void __ZTimerInit(void) +{ + KeQueryPerformanceCounter((LARGE_INTEGER*)&countFreq); +} + +/**************************************************************************** +REMARKS: +Call the assembler Zen Timer functions to do the timing. +****************************************************************************/ +static void __LZTimerOn( + LZTimerObject *tm) +{ + LARGE_INTEGER lt = KeQueryPerformanceCounter(NULL); + tm->start.low = lt.LowPart; + tm->start.high = lt.HighPart; +} + +/**************************************************************************** +REMARKS: +Call the assembler Zen Timer functions to do the timing. +****************************************************************************/ +static ulong __LZTimerLap( + LZTimerObject *tm) +{ + LARGE_INTEGER tmLap = KeQueryPerformanceCounter(NULL); + CPU_largeInteger tmCount; + + _CPU_diffTime64(&tm->start,(CPU_largeInteger*)&tmLap,&tmCount); + return _CPU_calcMicroSec(&tmCount,countFreq.low); +} + +/**************************************************************************** +REMARKS: +Call the assembler Zen Timer functions to do the timing. +****************************************************************************/ +static void __LZTimerOff( + LZTimerObject *tm) +{ + LARGE_INTEGER lt = KeQueryPerformanceCounter(NULL); + tm->end.low = lt.LowPart; + tm->end.high = lt.HighPart; +} + +/**************************************************************************** +REMARKS: +Call the assembler Zen Timer functions to do the timing. +****************************************************************************/ +static ulong __LZTimerCount( + LZTimerObject *tm) +{ + CPU_largeInteger tmCount; + + _CPU_diffTime64(&tm->start,&tm->end,&tmCount); + return _CPU_calcMicroSec(&tmCount,countFreq.low); +} + +/**************************************************************************** +REMARKS: +Define the resolution of the long period timer as microseconds per timer tick. +****************************************************************************/ +#define ULZTIMER_RESOLUTION 1 + +/**************************************************************************** +REMARKS: +Read the Long Period timer value from the BIOS timer tick. +****************************************************************************/ +static ulong __ULZReadTime(void) +{ + LARGE_INTEGER count; + KeQuerySystemTime(&count); + return (ulong)(*((_int64*)&count) / 10); +} + +/**************************************************************************** +REMARKS: +Compute the elapsed time from the BIOS timer tick. Note that we check to see +whether a midnight boundary has passed, and if so adjust the finish time to +account for this. We cannot detect if more that one midnight boundary has +passed, so if this happens we will be generating erronous results. +****************************************************************************/ +ulong __ULZElapsedTime(ulong start,ulong finish) +{ return finish - start; } + |