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[NTOSKRNL]

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- Move NtQueryTimerResolution and NtSetTimerResolution from ke/clock.c to their proper place in ex/time.c
- Simplify NtQueryTimerResolution and implement NtSetTimerResolution based on the patch of Aleksandar Andrejevic.
CORE-7387 #resolve #comment NtSetTimerResolution function committed in revision 59790, thanks :D

svn path=/trunk/; revision=59790
This commit is contained in:
Hermès Bélusca-Maïto 2013-08-21 16:54:19 +00:00
parent 7b25683467
commit 068cf237e9
2 changed files with 90 additions and 58 deletions
Download patch file Download diff file Expand all files Collapse all files

96
reactos/ntoskrnl/ex/time.c
View file

@ -48,9 +48,7 @@ ULONG ExpTimerResolutionCount = 0;
*--*/
BOOLEAN
NTAPI
ExAcquireTimeRefreshLock(
IN BOOLEAN Wait
)
ExAcquireTimeRefreshLock(IN BOOLEAN Wait)
{
/* Block APCs */
KeEnterCriticalRegion();
@ -82,9 +80,7 @@ ExAcquireTimeRefreshLock(
*--*/
VOID
NTAPI
ExReleaseTimeRefreshLock(
VOID
)
ExReleaseTimeRefreshLock(VOID)
{
/* Release the lock and re-enable APCs */
ExReleaseResourceLite(&ExpTimeRefreshLock);
@ -478,4 +474,92 @@ ExSystemTimeToLocalTime(PLARGE_INTEGER SystemTime,
LocalTime->QuadPart = SystemTime->QuadPart - ExpTimeZoneBias.QuadPart;
}
/*
* @implemented
*/
NTSTATUS
NTAPI
NtQueryTimerResolution(OUT PULONG MinimumResolution,
OUT PULONG MaximumResolution,
OUT PULONG ActualResolution)
{
KPROCESSOR_MODE PreviousMode = ExGetPreviousMode();
/* Check if the call came from user mode */
if (PreviousMode != KernelMode)
{
_SEH2_TRY
{
/* Probe the parameters */
ProbeForWriteUlong(MinimumResolution);
ProbeForWriteUlong(MaximumResolution);
ProbeForWriteUlong(ActualResolution);
}
_SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
{
/* Return the exception code */
_SEH2_YIELD(return _SEH2_GetExceptionCode());
}
_SEH2_END;
}
/*
* Set the parameters to the actual values.
*
* NOTE:
* MinimumResolution corresponds to the biggest time increment and
* MaximumResolution corresponds to the smallest time increment.
*/
*MinimumResolution = KeMaximumIncrement;
*MaximumResolution = KeMinimumIncrement;
*ActualResolution = KeTimeIncrement;
/* Return success */
return STATUS_SUCCESS;
}
/*
* @implemented
*/
NTSTATUS
NTAPI
NtSetTimerResolution(IN ULONG DesiredResolution,
IN BOOLEAN SetResolution,
OUT PULONG CurrentResolution)
{
KPROCESSOR_MODE PreviousMode = ExGetPreviousMode();
PEPROCESS Process = PsGetCurrentProcess();
ULONG NewResolution;
/* Check if the call came from user mode */
if (PreviousMode != KernelMode)
{
_SEH2_TRY
{
/* Probe the parameter */
ProbeForWriteUlong(CurrentResolution);
}
_SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
{
/* Return the exception code */
_SEH2_YIELD(return _SEH2_GetExceptionCode());
}
_SEH2_END;
}
/* Set and return the new resolution */
NewResolution = ExSetTimerResolution(DesiredResolution, SetResolution);
*CurrentResolution = NewResolution;
if (SetResolution)
{
/* Set the flag that the resolution has been changed */
Process->SetTimerResolution = TRUE;
}
/* Return success if the process changed its timer resolution */
if (Process->SetTimerResolution) return STATUS_SUCCESS;
else return STATUS_TIMER_RESOLUTION_NOT_SET;
}
/* EOF */

52
reactos/ntoskrnl/ke/clock.c
View file

@ -236,56 +236,4 @@ KeSetTimeIncrement(IN ULONG MaxIncrement,
KiTickOffset = MaxIncrement;
}
NTSTATUS
NTAPI
NtQueryTimerResolution(OUT PULONG MinimumResolution,
OUT PULONG MaximumResolution,
OUT PULONG ActualResolution)
{
KPROCESSOR_MODE PreviousMode = ExGetPreviousMode();
/* Check if the call came from user mode */
if (PreviousMode != KernelMode)
{
_SEH2_TRY
{
/* Probe the parameters */
ProbeForWriteUlong(MinimumResolution);
ProbeForWriteUlong(MaximumResolution);
ProbeForWriteUlong(ActualResolution);
/* Try to set the parameters to the actual values */
*MinimumResolution = KeMinimumIncrement;
*MaximumResolution = KeMaximumIncrement;
*ActualResolution = KeTimeIncrement;
}
_SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
{
/* Return the exception code */
_SEH2_YIELD(return _SEH2_GetExceptionCode());
}
_SEH2_END;
}
else
{
/* The call came from kernel mode. Use the pointers directly */
*MinimumResolution = KeMinimumIncrement;
*MaximumResolution = KeMaximumIncrement;
*ActualResolution = KeTimeIncrement;
}
/* Return success */
return STATUS_SUCCESS;
}
NTSTATUS
NTAPI
NtSetTimerResolution(IN ULONG DesiredResolution,
IN BOOLEAN SetResolution,
OUT PULONG CurrentResolution)
{
UNIMPLEMENTED;
return STATUS_NOT_IMPLEMENTED;
}
/* EOF */