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Diffstat (limited to 'private/ntos/nthals/halacr/mips/j4prof.c')
| -rw-r--r-- | private/ntos/nthals/halacr/mips/j4prof.c | 291 |
1 files changed, 291 insertions, 0 deletions
diff --git a/private/ntos/nthals/halacr/mips/j4prof.c b/private/ntos/nthals/halacr/mips/j4prof.c new file mode 100644 index 000000000..3fa8ecc4d --- /dev/null +++ b/private/ntos/nthals/halacr/mips/j4prof.c @@ -0,0 +1,291 @@ +/*++ + +Copyright (c) 1991 Microsoft Corporation + +Module Name: + + j4prof.c + +Abstract: + + This module contains the code to start and stop the profiling interrupt + and to compute the profiling interval for a MIPS R4000 Jazz system. + +Author: + + David N. Cutler (davec) 21-Feb-1991 + +Environment: + + Kernel mode only. + +Revision History: + +--*/ + +// #include "ki.h" +#include "halp.h" + +// +// Define one second and round values. +// + +#define ONE_SECOND (10 * 1000 * 1000) // 1 second in 100ns units +#define ROUND_VALUE ((ONE_SECOND) - 1) // 1 second minus 100ns + +// +// Define static data. +// + +LARGE_INTEGER HalpPerformanceCounter; +ULONG HalpProfileInterval = DEFAULT_PROFILE_INTERVAL; + +LARGE_INTEGER +KeQueryPerformanceCounter ( + OUT PLARGE_INTEGER Frequency OPTIONAL + ) + +/*++ + +Routine Description: + + This routine returns the current performance counter value and the + performance counter frequency. + +Arguments: + + Frequency - Supplies an optional pointer to a variable which receives + the performance counter frequency in Hertz. + +Return Value: + + The current performance counter value is returned as the function + value. + +--*/ + +{ + + ULONG CurrentCount; + KIRQL OldIrql; + LARGE_INTEGER PerformanceCounter; + + // + // Raise IRQL to PROFILE_LEVEL, read the current value of the count + // register, read the performance counter, and lower IRQL to its + // previous value. + // + // N.B. The minimum, maximum, and default values for the profile + // count are chosen such that count register only overflows + // after about 20 seconds at 50mhz. Therefore, there is never + // a problem with the counter wrapping in the following code. + // + + KeRaiseIrql(PROFILE_LEVEL, &OldIrql); + CurrentCount = HalpReadCountRegister(); + PerformanceCounter = HalpPerformanceCounter; + KeLowerIrql(OldIrql); + + // + // If the frequency parameter is specified, then return the performance + // counter frequency as the current system time frequency. + // + + if (ARGUMENT_PRESENT(Frequency) != FALSE) { + Frequency->QuadPart = HalpProfileCountRate; + } + + // + // Return the value of the performance counter. + // + + PerformanceCounter.QuadPart += CurrentCount; + return PerformanceCounter; +} + +VOID +HalCalibratePerformanceCounter ( + IN volatile PLONG Number + ) + +/*++ + +Routine Description: + + This routine resets the performance counter value for the current + processor to zero. The reset is done such that the resulting value + is closely synchronized with other processors in the configuration. + +Arguments: + + Number - Supplies a pointer to count of the number of processors in + the configuration. + +Return Value: + + None. + +--*/ + +{ + + // + // Write the compare register, clear the count register, and zero the + // performance counter for the current processor. + // + + HalpWriteCompareRegisterAndClear(DEFAULT_PROFILE_COUNT); + HalpPerformanceCounter.QuadPart = 0; + return; +} + +ULONG +HalSetProfileInterval ( + IN ULONG Interval + ) + +/*++ + +Routine Description: + + This routine sets the profile interrupt interval. + +Arguments: + + Interval - Supplies the desired profile interval in 100ns units. + +Return Value: + + The actual profile interval. + +--*/ + +{ + + LARGE_INTEGER TempValue; + + // + // If the specified profile interval is less that the minimum profile + // interval or greater than the maximum profile interval, then set the + // profile interval to the minimum or maximum as appropriate. + // + + if (Interval < MINIMUM_PROFILE_INTERVAL) { + Interval = MINIMUM_PROFILE_INTERVAL; + + } else if (Interval > MAXIMUM_PROFILE_INTERVAL) { + Interval = MAXIMUM_PROFILE_INTERVAL; + } + + // + // First compute the profile count value and then back calculate the + // actual profile interval. + // + + TempValue.QuadPart = Int32x32To64(HalpProfileCountRate, Interval); + TempValue.QuadPart += ROUND_VALUE; + TempValue = RtlExtendedLargeIntegerDivide(TempValue, ONE_SECOND, NULL); + TempValue.QuadPart = Int32x32To64(TempValue.LowPart, ONE_SECOND); + TempValue = RtlExtendedLargeIntegerDivide(TempValue, HalpProfileCountRate, NULL); + HalpProfileInterval = TempValue.LowPart; + return HalpProfileInterval; +} + +VOID +HalStartProfileInterrupt ( + KPROFILE_SOURCE Source + ) + +/*++ + +Routine Description: + + This routine computes the profile count value, writes the compare + register, clears the count register, and updates the performance + counter. + + N.B. This routine must be called at PROFILE_LEVEL while holding the + profile lock. + +Arguments: + + Source - Supplies the profile source. + +Return Value: + + None. + +--*/ + +{ + + ULONG PreviousCount; + LARGE_INTEGER TempValue; + + // + // Compute the profile count from the current profile interval. + // + + TempValue.QuadPart = Int32x32To64(HalpProfileCountRate, + HalpProfileInterval); + + TempValue.QuadPart += ROUND_VALUE; + TempValue = RtlExtendedLargeIntegerDivide(TempValue, ONE_SECOND, NULL); + + // + // Write the compare register and clear the count register. + // + + PreviousCount = HalpWriteCompareRegisterAndClear(TempValue.LowPart); + + // + // Update the performance counter by adding in the previous count value. + // + + HalpPerformanceCounter.QuadPart += PreviousCount; + return; +} + +VOID +HalStopProfileInterrupt ( + KPROFILE_SOURCE Source + ) + +/*++ + +Routine Description: + + This routine sets the default count value, writes the compare + register, clears the count register, and updates the performance + counter. + + N.B. This routine must be called at PROFILE_LEVEL while holding the + profile lock. + +Arguments: + + Source - Supplies the profile source. + +Return Value: + + None. + +--*/ + +{ + + ULONG PreviousCount; + + // + // Write the compare register and clear the count register. + // + + PreviousCount = HalpWriteCompareRegisterAndClear(DEFAULT_PROFILE_COUNT); + + // + // Update the performance counter by adding in the previous count value. + // + + HalpPerformanceCounter.QuadPart += PreviousCount; + return; +} |