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https://github.com/reactos/reactos.git
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133 lines
3.2 KiB
C
133 lines
3.2 KiB
C
/*
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* PROJECT: ReactOS HAL
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* LICENSE: GPL - See COPYING in the top level directory
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* FILE: hal/halx86/generic/timer.c
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* PURPOSE: HAL Timer Routines
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* PROGRAMMERS: Alex Ionescu (alex.ionescu@reactos.org)
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*/
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/* INCLUDES ******************************************************************/
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#include <hal.h>
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#define NDEBUG
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#include <debug.h>
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/* GLOBALS *******************************************************************/
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BOOLEAN HalpClockSetMSRate;
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ULONG HalpCurrentTimeIncrement;
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ULONG HalpCurrentRollOver;
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ULONG HalpNextMSRate = 14;
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ULONG HalpLargestClockMS = 15;
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LARGE_INTEGER HalpRolloverTable[15] =
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{
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{{1197, 10032}},
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{{2394, 20064}},
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{{3591, 30096}},
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{{4767, 39952}},
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{{5964, 49984}},
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{{7161, 60016}},
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{{8358, 70048}},
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{{9555, 80080}},
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{{10731, 89936}},
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{{11949, 100144}},
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{{13125, 110000}},
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{{14322, 120032}},
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{{15519, 130064}},
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{{16695, 139920}},
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{{17892, 149952}}
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};
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/* PRIVATE FUNCTIONS *********************************************************/
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VOID
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NTAPI
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HalpInitializeClock(VOID)
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{
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PKPRCB Prcb = KeGetCurrentPrcb();
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ULONG Increment;
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USHORT RollOver;
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ULONG Flags = 0;
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/* Check the CPU Type */
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if (Prcb->CpuType <= 4)
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{
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/* 486's or equal can't go higher then 10ms */
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HalpLargestClockMS = 10;
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HalpNextMSRate = 9;
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}
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/* Get increment and rollover for the largest time clock ms possible */
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Increment= HalpRolloverTable[HalpLargestClockMS - 1].HighPart;
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RollOver = (USHORT)HalpRolloverTable[HalpLargestClockMS - 1].LowPart;
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/* Set the maximum and minimum increment with the kernel */
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HalpCurrentTimeIncrement = Increment;
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KeSetTimeIncrement(Increment, HalpRolloverTable[0].HighPart);
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/* Disable interrupts */
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Ke386SaveFlags(Flags);
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_disable();
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/* Set the rollover */
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__outbyte(TIMER_CONTROL_PORT, TIMER_SC0 | TIMER_BOTH | TIMER_MD2);
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__outbyte(TIMER_DATA_PORT0, RollOver & 0xFF);
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__outbyte(TIMER_DATA_PORT0, RollOver >> 8);
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/* Restore interrupts if they were previously enabled */
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Ke386RestoreFlags(Flags);
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/* Save rollover and return */
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HalpCurrentRollOver = RollOver;
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}
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/* PUBLIC FUNCTIONS ***********************************************************/
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/*
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* @implemented
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*/
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VOID
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NTAPI
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HalCalibratePerformanceCounter(IN volatile PLONG Count,
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IN ULONGLONG NewCount)
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{
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ULONG Flags = 0;
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/* Disable interrupts */
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Ke386SaveFlags(Flags);
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_disable();
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/* Do a decrement for this CPU */
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_InterlockedDecrement(Count);
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/* Wait for other CPUs */
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while (*Count);
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/* Restore interrupts if they were previously enabled */
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Ke386RestoreFlags(Flags);
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}
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/*
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* @implemented
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*/
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ULONG
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NTAPI
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HalSetTimeIncrement(IN ULONG Increment)
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{
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/* Round increment to ms */
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Increment /= 10000;
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/* Normalize between our minimum (1 ms) and maximum (variable) setting */
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if (Increment > HalpLargestClockMS) Increment = HalpLargestClockMS;
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if (Increment <= 0) Increment = 1;
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/* Set the rate and tell HAL we want to change it */
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HalpNextMSRate = Increment;
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HalpClockSetMSRate = TRUE;
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/* Return the increment */
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return HalpRolloverTable[Increment - 1].HighPart;
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}
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/* EOF */
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