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578 lines
15 KiB
578 lines
15 KiB
title "Interval Clock Interrupt"
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;++
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;
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; Copyright (c) 1989 Microsoft Corporation
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; Copyright (c) 1992 AST Research Inc.
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;
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; Module Name:
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;
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; astclock.asm
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;
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; Abstract:
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;
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; This module implements the code necessary to field and process the
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; interval clock interrupt.
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;
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; Author:
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;
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; Shie-Lin Tzong (shielint) 12-Jan-1990
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;
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; Environment:
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;
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; Kernel mode only.
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;
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; Revision History:
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;
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; bryanwi 20-Sep-90
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;
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; Add KiSetProfileInterval, KiStartProfileInterrupt,
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; KiStopProfileInterrupt procedures.
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; KiProfileInterrupt ISR.
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; KiProfileList, KiProfileLock are delcared here.
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;
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; shielint 10-Dec-90
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; Add performance counter support.
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; Move system clock to irq8, ie we now use RTC to generate system
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; clock. Performance count and Profile use timer 1 counter 0.
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; The interval of the irq0 interrupt can be changed by
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; KiSetProfileInterval. Performance counter does not care about the
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; interval of the interrupt as long as it knows the rollover count.
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; Note: Currently I implemented 1 performance counter for the whole
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; i386 NT. It works on UP and SystemPro.
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;
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; John Vert (jvert) 11-Jul-1991
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; Moved from ke\i386 to hal\i386. Removed non-HAL stuff
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;
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; shie-lin tzong (shielint) 13-March-92
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; Move System clock back to irq0 and use RTC (irq8) to generate
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; profile interrupt. Performance counter and system clock use time1
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; counter 0 of 8254.
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;
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; Quang Phan (v-quangp) 11-Aug-1992
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; Convert to ASTMP system. All processors receive interrupts from the
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; system clock and profile interrupts. Added support for the CPU leds.
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;
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;--
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.386p
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.xlist
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include hal386.inc
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include callconv.inc
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include i386\ix8259.inc
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include i386\ixcmos.inc
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include i386\kimacro.inc
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include mac386.inc
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include i386\astmp.inc
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.list
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EXTRNP _DbgBreakPoint,0,IMPORT
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EXTRNP _KeUpdateSystemTime,0
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EXTRNP _KeUpdateRunTime,1,IMPORT
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EXTRNP Kei386EoiHelper,0,IMPORT
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EXTRNP _HalEndSystemInterrupt,2
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EXTRNP _HalBeginSystemInterrupt,3
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EXTRNP _HalRequestIpi,1
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EXTRNP _HalpAcquireCmosSpinLock ,0
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EXTRNP _HalpReleaseCmosSpinLock ,0
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EXTRNP _KeSetTimeIncrement,2,IMPORT
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extrn _HalpSystemHardwareLock:DWORD
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EXTRNP _DisplPanel,1
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extrn _HalpIRQLtoVector:BYTE
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extrn _EBI2_CallTab:DWORD
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extrn _EBI2_MMIOTable:DWORD
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;
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; Constants used to initialize timer 0
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;
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TIMER1_DATA_PORT0 EQU 40H ; Timer1, channel 0 data port
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TIMER1_CONTROL_PORT0 EQU 43H ; Timer1, channel 0 control port
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TIMER1_IRQ EQU 0 ; Irq 0 for timer1 interrupt
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COMMAND_8254_COUNTER0 EQU 00H ; Select count 0
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COMMAND_8254_RW_16BIT EQU 30H ; Read/Write LSB firt then MSB
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COMMAND_8254_MODE2 EQU 4 ; Use mode 2
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COMMAND_8254_BCD EQU 0 ; Binary count down
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COMMAND_8254_LATCH_READ EQU 0 ; Latch read command
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PERFORMANCE_FREQUENCY EQU 1193182
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;
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; Constants used to initialize CMOS/Real Time Clock
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;
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CMOS_STATUS_BUSY EQU 80H ; Time update in progress
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RTC_OFFSET_SECOND EQU 0 ; second field of RTC memory
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RTC_OFFSET_MINUTE EQU 2 ; minute field of RTC memory
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RTC_OFFSET_HOUR EQU 4 ; hour field of RTC memory
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RTC_OFFSET_DAY_OF_WEEK EQU 6 ; day-of-week field of RTC memory
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RTC_OFFSET_DATE_OF_MONTH EQU 7 ; date-of-month field of RTC memory
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RTC_OFFSET_MONTH EQU 8 ; month field of RTC memory
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RTC_OFFSET_YEAR EQU 9 ; year field of RTC memory
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RTC_OFFSET_CENTURY EQU 32h ; Century field of RTC memory
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;
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; ==== Values used for System Clock ====
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;
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;
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; Convert the interval to rollover count for 8254 Timer1 device.
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; Timer1 counts down a 16 bit value at a rate of 1.193181667M counts-per-sec.
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;
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; The best fit value closest to 10ms (but not below) is 10.0144012689ms:
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; ROLLOVER_COUNT 11949
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; TIME_INCREMENT 100144
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; Calculated error is -.0109472 s/day
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;
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; The best fit value closest to 15ms (but not above) is 14.9952019ms:
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; ROLLOVER_COUNT 17892
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; TIME_INCREMENT 149952
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; Calculated error is -.0109472 s/day
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;
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; On 486 class machines or better we use a 10ms tick, on 386
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; class machines we use a 15ms tick
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;
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ROLLOVER_COUNT EQU 11949
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_DATA SEGMENT DWORD PUBLIC 'DATA'
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;
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; 8254 spinlock. This must be acquired before touching the 8254 chip.
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;
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public _Halp8254Lock
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_Halp8254Lock dd 0
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;
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; PerfCounter value lock. locks access to the HalpPerfCounterLow/High vars.
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;
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_HalpPerfCounterLock dd 0
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public HalpPerfCounterLow
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public HalpPerfCounterHigh
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HalpPerfCounterLow dd 0
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HalpPerfCounterHigh dd 0
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HalpPerfCounterInit dd 0
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_DATA ends
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_TEXT SEGMENT DWORD PUBLIC 'CODE'
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ASSUME DS:FLAT, ES:FLAT, SS:NOTHING, FS:NOTHING, GS:NOTHING
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page ,132
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subttl "Initialize Clock"
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;++
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;
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; VOID
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; HalpInitializeClock (
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; )
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;
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; Routine Description:
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;
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; This routine initialize system time clock using 8254 timer1 counter 0
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; to generate an interrupt at every 15ms interval at 8259 irq0
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;
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; See the definition of TIME_INCREMENT and ROLLOVER_COUNT if clock rate
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; needs to be changed.
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;
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; Arguments:
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;
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; None
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;
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; Return Value:
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;
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; None.
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;
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;--
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cPublicProc _HalpInitializeClock,0
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pushfd ; save caller's eflag
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cli ; make sure interrupts are disabled
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;
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; Set clock rate
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;
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mov al,COMMAND_8254_COUNTER0+COMMAND_8254_RW_16BIT+COMMAND_8254_MODE2
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out TIMER1_CONTROL_PORT0, al ;program count mode of timer 0
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IoDelay
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mov ecx, ROLLOVER_COUNT
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mov al, cl
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out TIMER1_DATA_PORT0, al ; program timer 0 LSB count
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IoDelay
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mov al,ch
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out TIMER1_DATA_PORT0, al ; program timer 0 MSB count
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popfd ; restore caller's eflag
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;
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; Fill in PCR value with TIME_INCREMENT
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;
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mov edx, TIME_INCREMENT
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stdCall _KeSetTimeIncrement, <edx, edx>
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mov HalpPerfCounterInit, 1 ; Indicate performance counter
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; has been initialized.
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stdRET _HalpInitializeClock
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stdENDP _HalpInitializeClock
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page ,132
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subttl "Query Performance Counter"
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;++
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;
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; LARGE_INTEGER
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; KeQueryPerformanceCounter (
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; OUT PLARGE_INTEGER PerformanceFrequency OPTIONAL
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; )
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;
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; Routine Description:
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;
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; This routine returns current 64-bit performance counter and,
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; optionally, the Performance Frequency.
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;
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; Note this routine can NOT be called at Profiling interrupt
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; service routine. Because this routine depends on IRR0 to determine
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; the actual count.
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;
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; Also note that the performace counter returned by this routine
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; is not necessary the value when this routine is just entered.
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; The value returned is actually the counter value at any point
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; between the routine is entered and is exited.
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;
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; Arguments:
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;
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; PerformanceFrequency [TOS+4] - optionally, supplies the address
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; of a variable to receive the performance counter frequency.
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;
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; Return Value:
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;
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; Current value of the performance counter will be returned.
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;
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;--
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;
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; Parameter definitions
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;
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KqpcFrequency EQU [esp+12] ; User supplied Performance Frequence
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cPublicProc _KeQueryPerformanceCounter,1
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push ebx
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push esi
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;
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; First check to see if the performance counter has been initialized yet.
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; Since the kernel debugger calls KeQueryPerformanceCounter to support the
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; !timer command, we need to return something reasonable before 8254
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; initialization has occured. Reading garbage off the 8254 is not reasonable.
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;
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cmp HalpPerfCounterInit, 0
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jne Kqpc01 ; ok, perf counter has been initialized
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;
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; Initialization hasn't occured yet, so just return zeroes.
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;
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mov eax, 0
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mov edx, 0
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jmp Kqpc20
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Kqpc01:
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Kqpc11: pushfd
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cli
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ifndef NT_UP
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lea eax, _Halp8254Lock
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ACQUIRE_SPINLOCK eax, Kqpc198
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endif
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;
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; Fetch the base value. Note that interrupts are off.
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;
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; NOTE:
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; Need to watch for Px reading the 'CounterLow', P0 updates both
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; then Px finishes reading 'CounterHigh' [getting the wrong value].
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; After reading both, make sure that 'CounterLow' didn't change.
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; If it did, read it again. This way, we won't have to use a spinlock.
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;
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@@:
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mov ebx, HalpPerfCounterLow
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mov esi, HalpPerfCounterHigh ; [esi:ebx] = Performance counter
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cmp ebx, HalpPerfCounterLow ;
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jne @b
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;
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; Fetch the current counter value from the hardware
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;
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mov al, COMMAND_8254_LATCH_READ+COMMAND_8254_COUNTER0
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;Latch PIT Ctr 0 command.
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out TIMER1_CONTROL_PORT0, al
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IODelay
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in al, TIMER1_DATA_PORT0 ;Read PIT Ctr 0, LSByte.
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IODelay
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movzx ecx,al ;Zero upper bytes of (ECX).
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in al, TIMER1_DATA_PORT0 ;Read PIT Ctr 0, MSByte.
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mov ch, al ;(CX) = PIT Ctr 0 count.
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ifndef NT_UP
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lea eax, _Halp8254Lock
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RELEASE_SPINLOCK eax
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endif
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;
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; Now enable interrupts such that if timer interrupt is pending, it can
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; be serviced and update the PerformanceCounter. Note that there could
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; be a long time between the sti and cli because ANY interrupt could come
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; in in between.
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;
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popfd ; don't re-enable interrupts if
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nop ; the caller had them off!
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jmp $+2
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;
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; Fetch the base value again.
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;
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@@:
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mov eax, HalpPerfCounterLow
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mov edx, HalpPerfCounterHigh ; [edx:eax] = new counter value
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cmp eax, HalpPerfCounterLow
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jne @b
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;
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; Compare the two reads of Performance counter. If they are different,
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; simply returns the new Performance counter. Otherwise, we add the hardware
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; count to the performance counter to form the final result.
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;
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cmp eax, ebx
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jne short Kqpc20
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cmp edx, esi
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jne short Kqpc20
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neg ecx ; PIT counts down from 0h
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add ecx, ROLLOVER_COUNT
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add eax, ecx
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adc edx, 0 ; [edx:eax] = Final result
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;
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; Return the counter
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;
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Kqpc20:
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; return value is in edx:eax
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;
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; Return the freq. if caller wants it.
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;
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or dword ptr KqpcFrequency, 0 ; is it a NULL variable?
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jz short Kqpc99 ; if z, yes, go exit
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mov ecx, KqpcFrequency ; (ecx)-> Frequency variable
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mov DWORD PTR [ecx], PERFORMANCE_FREQUENCY ; Set frequency
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mov DWORD PTR [ecx+4], 0
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Kqpc99:
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pop esi ; restore esi and ebx
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pop ebx
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stdRET _KeQueryPerformanceCounter
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ifndef NT_UP
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Kqpc198: popfd
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SPIN_ON_SPINLOCK eax,<Kqpc11>
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endif
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stdENDP _KeQueryPerformanceCounter
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;++
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;
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; VOID
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; HalCalibratePerformanceCounter (
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; IN volatile PLONG Number
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; )
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;
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; /*++
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;
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; Routine Description:
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;
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; This routine calibrates the performance counter value for a
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; multiprocessor system. The calibration can be done by zeroing
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; the current performance counter, or by calculating a per-processor
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; skewing between each processors counter.
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;
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; Arguments:
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;
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; Number - Supplies a pointer to count of the number of processors in
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; the configuration.
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;
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; Return Value:
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;
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; None.
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;--
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cPublicProc _HalCalibratePerformanceCounter,1
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mov eax, [esp+4] ; ponter to Number
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pushfd ; save previous interrupt state
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cli ; disable interrupts (go to high_level)
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lock dec dword ptr [eax] ; count down
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@@: cmp dword ptr [eax], 0 ; wait for all processors to signal
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jnz short @b
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;
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; Nothing to calibrate on a AST MP machine. There is only a single
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; 8254 device
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;
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popfd ; restore interrupt flag
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stdRET _HalCalibratePerformanceCounter
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stdENDP _HalCalibratePerformanceCounter
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page ,132
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subttl "System Clock Interrupt"
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;++
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;
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; Routine Description:
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;
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;
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; This routine is entered as the result of an interrupt generated by CLOCK2.
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; Its function is to dismiss the interrupt, raise system Irql to
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; CLOCK2_LEVEL, update performance counter and transfer control to the
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; standard system routine to update the system time and the execution
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; time of the current thread
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; and process.
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;
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;
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; Arguments:
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;
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; None
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; Interrupt is disabled
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;
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; Return Value:
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;
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; Does not return, jumps directly to KeUpdateSystemTime, which returns
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;
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; Sets Irql = CLOCK2_LEVEL and dismisses the interrupt
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;
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;--
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ENTER_DR_ASSIST Hci_a, Hci_t
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cPublicProc _HalpClockInterrupt,0
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;
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; Save machine state in trap frame
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;
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ENTER_INTERRUPT Hci_a, Hci_t
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;
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; (esp) - base of trap frame
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;
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;
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; dismiss interrupt and raise Irql
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;
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movzx eax,_HalpIRQLtoVector[CLOCK2_LEVEL]
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push eax
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sub esp, 4 ; allocate space to save OldIrql
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; esp - OldIrql
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stdCall _HalBeginSystemInterrupt,<CLOCK2_LEVEL,eax,esp>
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or al,al ; check for spurious interrupt
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jz Hci100
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;
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; Update performance counter
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;
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cmp fs:PcHal.PcrEBI2ProcessorID, 0
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jnz short @f
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add HalpPerfCounterLow, ROLLOVER_COUNT ; update performace counter
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adc HalpPerfCounterHigh, 0
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@@:
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;
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; Check for Idle state and log processor state to the front panel CPU leds.
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;
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inc fs:PcHal.PcrCpuLedRateCount
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cmp fs:PcHal.PcrCpuLedRateCount, CpuLedSamplingRate
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jne Hci010 ; Don't update LED yet
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mov fs:PcHal.PcrCpuLedRateCount,0 ;reset rate count
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mov edx, fs:PcPrcb
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mov eax, [edx].PbIdleThread
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cmp eax, [edx].PbCurrentThread
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je ProcIdle
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CALL_EBI2 LogProcBusy,1
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jmp Hci010
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ProcIdle:
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CALL_EBI2 LogProcIdle,1
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Hci010:
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;
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; (esp) = OldIrql
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; (esp+4) = Vector
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; (esp+8) = base of trap frame
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; (ebp) = address of trap frame
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; (eax) = time increment
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;
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mov eax, TIME_INCREMENT
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cmp fs:PcHal.PcrEBI2ProcessorID, 0 ; is this the master cpu?
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je _KeUpdateSystemTime@0 ; if it is, update system time
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sti
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stdCall _KeUpdateRunTime,<dword ptr [esp]> ; othewise update runtime
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INTERRUPT_EXIT ; lower irql to old value, iret
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Hci100:
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add esp, 8 ; spurious, no EndOfInterrupt
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SPURIOUS_INTERRUPT_EXIT ; exit interrupt without eoi
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stdENDP _HalpClockInterrupt
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;++
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;
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; ULONG
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; HalSetTimeIncrement (
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; IN ULONG DesiredIncrement
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; )
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;
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; /*++
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;
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; Routine Description:
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;
|
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; This routine initialize system time clock to generate an
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; interrupt at every DesiredIncrement interval.
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;
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; Arguments:
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;
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; DesiredIncrement - desired interval between every timer tick (in
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; 100ns unit.)
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;
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; Return Value:
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;
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; The *REAL* time increment set.
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;--
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cPublicProc _HalSetTimeIncrement,1
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mov eax, TIME_INCREMENT
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|
stdRET _HalSetTimeIncrement
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|
stdENDP _HalSetTimeIncrement
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|
_TEXT ends
|
|
end
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|