mirror of
https://github.com/reactos/reactos.git
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[HAL]
- Rewrite KeQueryPerformanceCounter in C - Implement support for changing the clock rate svn path=/trunk/; revision=53495
This commit is contained in:
Timo Kreuzer
parent
79517b3d28
commit
e03d0348d9
2 changed files with 188 additions and 263 deletions
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@ -64,38 +64,38 @@ _HalpCalibrateStallExecution@0:
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/* Save EFLAGS and kill interrupts */
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pushfd
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cli
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/* Get the current interrupt mask on the PICs */
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xor eax, eax
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in al, PIC2_DATA
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shl eax, 8
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in al, PIC1_DATA
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/* Save it */
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push eax
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/* Now mask everything except the RTC and PIC 2 chain-interrupt */
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mov eax, NOT (HEX(04) OR HEX(100))
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/* Program the PICs */
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out PIC1_DATA, al
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shr eax, 8
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out PIC2_DATA, al
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/* Now get the IDT */
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sidt [ebp-8]
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mov ecx, [ebp-6]
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/* Get the IDT entry for the RTC */
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mov eax, HEX(38)
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shl eax, 3
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add ecx, eax
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/* Save the original RTC ISR */
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push [ecx]
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push [ecx+4]
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push ecx
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/* Now load our new handler */
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mov eax, offset OnlyOnePersonCanWriteHalCode
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mov [ecx], ax
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@ -106,10 +106,10 @@ _HalpCalibrateStallExecution@0:
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/* Reset our counter */
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mov dword ptr [ebp-12], 0
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/* Acquire CMOS lock */
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call _HalpAcquireSystemHardwareSpinLock@0
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/* Now initialize register A on the CMOS */
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mov ax, HEX(2D00) OR CMOS_REGISTER_A
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out CMOS_ADDR, al
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@ -117,21 +117,21 @@ _HalpCalibrateStallExecution@0:
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mov al, ah
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out CMOS_DATA, al
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jmp $+2
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/* Read register B */
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mov ax, CMOS_REGISTER_B
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out CMOS_ADDR, al
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jmp $+2
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in al, CMOS_DATA
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jmp $+2
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/* Don't touch the LastKnownGoodConfig hack */
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and al, 1
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mov ah, al
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/* Enable the interrupt */
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or ah, HEX(42)
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/* Now write the register B */
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mov al, CMOS_REGISTER_B
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out CMOS_ADDR, al
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@ -139,47 +139,47 @@ _HalpCalibrateStallExecution@0:
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mov al, ah
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out CMOS_DATA, al
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jmp $+2
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/* Read register C */
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mov al, CMOS_REGISTER_C
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out CMOS_ADDR, al
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jmp $+2
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in al, CMOS_DATA
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jmp $+2
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/* Read register D */
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mov al, CMOS_REGISTER_D
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out CMOS_ADDR, al
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jmp $+2
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in al, CMOS_DATA
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jmp $+2
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/* Release CMOS lock */
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mov dword ptr [ebp-12], 0
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call _HalpReleaseCmosSpinLock@0
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/* Initialize looper */
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xor eax, eax
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/* Align to 16 bytes */
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.align 16
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/* Enable interrupts! */
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sti
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jmp Looper
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/* Align to 16 bytes */
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.align 16
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/* Subtract one count */
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Looper:
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sub eax, 1
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jnz Looper
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/* ASSERT: If we got here, then the RTC never fired */
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call _DbgBreakPoint@0
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jmp Looper
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OnlyOnePersonCanWriteHalCode:
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/*********************** THIS IS THE RTC HANDLER **************************/
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@ -187,17 +187,17 @@ OnlyOnePersonCanWriteHalCode:
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inc dword ptr [ebp-12]
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cmp dword ptr [ebp-12], 1
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jnz ComputeStall
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/*
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* It is the first one -- we'll ignore it, since it fires randomly!
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* Get rid of the old return address and push the new one in (our looper)
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*/
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pop eax
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push offset Looper
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/* Acquire CMOS lock */
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call _HalpAcquireSystemHardwareSpinLock@0
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/* Now initialize register A on the CMOS */
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mov ax, HEX(2D00) OR CMOS_REGISTER_A
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out CMOS_ADDR, al
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@ -205,21 +205,21 @@ OnlyOnePersonCanWriteHalCode:
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mov al, ah
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out CMOS_DATA, al
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jmp $+2
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/* Read register B */
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mov ax, CMOS_REGISTER_B
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out CMOS_ADDR, al
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jmp $+2
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in al, CMOS_DATA
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jmp $+2
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/* Don't touch the LastKnownGoodConfig hack */
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and al, 1
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mov ah, al
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/* Enable the interrupt */
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or ah, HEX(42)
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/* Now write the register B */
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mov al, CMOS_REGISTER_B
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out CMOS_ADDR, al
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@ -227,34 +227,34 @@ OnlyOnePersonCanWriteHalCode:
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mov al, ah
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out CMOS_DATA, al
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jmp $+2
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/* Read register C */
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mov al, CMOS_REGISTER_C
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out CMOS_ADDR, al
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jmp $+2
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in al, CMOS_DATA
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jmp $+2
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/* Read register D */
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mov al, CMOS_REGISTER_D
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out CMOS_ADDR, al
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jmp $+2
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in al, CMOS_DATA
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jmp $+2
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/* Release CMOS lock */
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call _HalpReleaseCmosSpinLock@0
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/* Dismiss the interrupt */
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mov al, PIC_EOI
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out PIC2_COMMAND, al
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mov al, PIC_SPECIFIC_EOI2
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out PIC1_COMMAND, al
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/* Reset the counter and return back to the looper */
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xor eax, eax
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iretd
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/******************* THIS IS THE 2ND RTC HANDLER **************************/
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ComputeStall:
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@ -263,26 +263,26 @@ ComputeStall:
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xor edx, edx
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mov ecx, 125000 /* RTC fires every 125 ms */
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div ecx
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/* Is the remainder 0? */
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cmp edx, 0
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jz FoundFactor
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/* Otherwise fix-up the loop count */
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inc eax
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FoundFactor:
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/* Save the stall scale factor */
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mov fs:[KPCR_STALL_SCALE_FACTOR], eax
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/* Prepare for interrupt return */
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pop eax
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push offset AndItsNotYou
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mov eax, HEX(13)
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/* Acquire CMOS lock */
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call _HalpAcquireSystemHardwareSpinLock@0
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/* Now initialize register A on the CMOS */
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mov ax, HEX(2D00) OR CMOS_REGISTER_A
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out CMOS_ADDR, al
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@ -290,21 +290,21 @@ FoundFactor:
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mov al, ah
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out CMOS_DATA, al
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jmp $+2
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/* Read register B */
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mov ax, CMOS_REGISTER_B
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out CMOS_ADDR, al
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jmp $+2
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in al, CMOS_DATA
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jmp $+2
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/* Don't touch the LastKnownGoodConfig hack */
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and al, 1
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mov ah, al
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/* Disable the interrupt */
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or ah, 2
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/* Now write the register B */
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mov al, CMOS_REGISTER_B
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out CMOS_ADDR, al
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@ -312,27 +312,27 @@ FoundFactor:
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mov al, ah
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out CMOS_DATA, al
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jmp $+2
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/* Read register C */
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mov al, CMOS_REGISTER_C
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out CMOS_ADDR, al
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jmp $+2
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in al, CMOS_DATA
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jmp $+2
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/* Release CMOS lock */
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call _HalpReleaseCmosSpinLock@0
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/* Dismiss the interrupt */
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mov al, PIC_EOI
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out PIC2_COMMAND, al
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mov al, PIC_SPECIFIC_EOI2
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out PIC1_COMMAND, al
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/* Disable interrupts on return */
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and word ptr [esp+8], NOT EFLAGS_INTERRUPT_MASK
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iretd
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/************************* WE ARE BACK FROM RTC ***************************/
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AndItsNotYou:
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@ -340,16 +340,16 @@ AndItsNotYou:
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pop ecx
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pop [ecx+4]
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pop [ecx]
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/* Restore the mask */
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pop eax
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out PIC1_DATA, al
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shr eax, 8
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out PIC2_DATA, al
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/* Restore EFLAGS */
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popf
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popfd
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/* Restore stack and return */
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mov esp, ebp
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pop ebp
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@ -368,9 +368,6 @@ _KeStallExecutionProcessor@4:
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mov eax, fs:[KPCR_STALL_SCALE_FACTOR]
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mul ecx
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/* Align to 16 bytes */
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.align 16
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/* Jump to subtraction loop */
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jmp SubtractLoop
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@ -387,165 +384,4 @@ Done:
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ret 4
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#endif
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PUBLIC _KeQueryPerformanceCounter@4
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_KeQueryPerformanceCounter@4:
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/* Check if we were called too early */
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cmp dword ptr _HalpCurrentRollOver, 0
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je NoCount
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/* Save volatiles */
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push ebx
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push esi
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LoopPreInt:
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/* Disable interrupts */
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pushf
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cli
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LoopPostInt:
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/* Get the current value */
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mov ebx, dword ptr _HalpPerfCounterLow
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mov esi, dword ptr _HalpPerfCounterHigh
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/* Read 8254 timer */
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mov al, 0 /* Interrupt on terminal count */
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out PIT_MODE, al
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in al, SYSTEM_CTRL_PORT_A
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or al, byte ptr _HalpPerfCounterCutoff
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out SYSTEM_CTRL_PORT_A, al
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jmp $+2
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in al, PIT_CH0
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jmp $+2
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movzx ecx, al
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in al, PIT_CH0
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mov ch, al
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/* Enable interrupts and do a short wait */
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popf
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nop
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jmp $+2
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/* Disable them again */
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pushf
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cli
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/* Get the counter value again */
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mov eax, dword ptr _HalpPerfCounterLow
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mov edx, dword ptr _HalpPerfCounterHigh
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/* Check if someone updated the counter */
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cmp eax, ebx
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jnz LoopPostInt
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cmp edx, esi
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jnz LoopPostInt
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/* Check if the current 8254 value causes rollover */
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neg ecx
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add ecx, dword ptr _HalpCurrentRollOver
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jnb DoRollOver
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SetSum:
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/* Calculate the sum */
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add eax, ecx
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adc edx, 0
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/* Check if we're above or below the last high value */
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cmp edx, dword ptr _HalpLastPerfCounterHigh
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jb short BelowHigh
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jnz short BelowLow
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/* Check if we're above or below the last low value */
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cmp eax, dword ptr _HalpLastPerfCounterLow
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jb BelowHigh
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BelowLow:
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/* Update the last value and bring back interrupts */
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mov dword ptr _HalpLastPerfCounterLow, eax
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mov dword ptr _HalpLastPerfCounterHigh, edx
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popf
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/* Check if caller wants frequency */
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cmp dword ptr [esp+12], 0
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jz ReturnNoFreq
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/* Save hard-coded frequency */
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mov ecx, dword ptr [esp+12]
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mov dword ptr [ecx], 1193182
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mov dword ptr [ecx+4], 0
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ReturnNoFreq:
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/* Restore volatiles */
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pop esi
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pop ebx
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ret 4
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NoCount:
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/* Return empty, called too soon */
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mov eax, 0
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mov edx, 0
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ret 4
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DoRollOver:
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/* We might have an incoming interrupt, save EFLAGS and reset rollover */
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mov esi, [esp]
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mov ecx, dword ptr _HalpCurrentRollOver
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popf
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/* Check if interrupts were enabled and try again */
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test esi, EFLAGS_INTERRUPT_MASK
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jnz LoopPreInt
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/* They're not, continue where we left */
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pushf
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jmp SetSum
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BelowHigh:
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/* Get the last counter values */
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mov ebx, dword ptr _HalpLastPerfCounterLow
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mov esi, dword ptr _HalpLastPerfCounterHigh
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/* Check if the previous value was 0 and go back if yes */
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mov ecx, ebx
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or ecx, esi
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jz BelowLow
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/* Make sure that the count is still valid */
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sub ebx, eax
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sbb esi, edx
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jnz InvalidCount
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cmp ebx, dword ptr _HalpCurrentRollOver
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jg InvalidCount
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/* Fixup the count with the last known value */
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sub eax, ebx
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sbb edx, esi
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/* We might have an incoming interrupt, save EFLAGS */
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mov ecx, [esp]
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popf
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/* Check if interrupts were enabled and try again */
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test ecx, EFLAGS_INTERRUPT_MASK
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jnz LoopPreInt
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/* They're not, continue where we left */
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pushf
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jmp BelowLow
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InvalidCount:
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popf
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xor eax, eax
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mov dword ptr _HalpLastPerfCounterLow, eax
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mov dword ptr _HalpLastPerfCounterHigh, eax
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jmp LoopPreInt
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END
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@ -4,6 +4,7 @@
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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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* Timo Kreuzer (timo.kreuzer@reactos.org)
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*/
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/* INCLUDES ******************************************************************/
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@ -14,6 +15,9 @@
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/* GLOBALS *******************************************************************/
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#define PIT_LATCH 0x00
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LARGE_INTEGER HalpLastPerfCounter;
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ULONG HalpPerfCounterCutoff;
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BOOLEAN HalpClockSetMSRate;
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ULONG HalpCurrentTimeIncrement;
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@ -21,54 +25,56 @@ 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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static struct _HALP_ROLLOVER
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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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ULONG RollOver;
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ULONG Increment;
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} 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},
|
||||
{15519, 130064},
|
||||
{16695, 139920},
|
||||
{17892, 149952}
|
||||
};
|
||||
|
||||
/* PRIVATE FUNCTIONS *********************************************************/
|
||||
|
||||
FORCEINLINE
|
||||
ULONG
|
||||
HalpRead8254Value(void)
|
||||
{
|
||||
ULONG TimerValue;
|
||||
|
||||
/* Send counter latch command for channel 0 */
|
||||
__outbyte(TIMER_CONTROL_PORT, PIT_LATCH);
|
||||
__nop();
|
||||
|
||||
/* Read the value, LSB first */
|
||||
TimerValue = __inbyte(TIMER_CHANNEL0_DATA_PORT);
|
||||
__nop();
|
||||
TimerValue |= __inbyte(TIMER_CHANNEL0_DATA_PORT) << 8;
|
||||
|
||||
return TimerValue;
|
||||
}
|
||||
|
||||
VOID
|
||||
NTAPI
|
||||
INIT_FUNCTION
|
||||
HalpInitializeClock(VOID)
|
||||
HalpSetTimerRollOver(USHORT RollOver)
|
||||
{
|
||||
PKPRCB Prcb = KeGetCurrentPrcb();
|
||||
ULONG Increment;
|
||||
USHORT RollOver;
|
||||
ULONG_PTR Flags;
|
||||
TIMER_CONTROL_PORT_REGISTER TimerControl;
|
||||
|
||||
/* Check the CPU Type */
|
||||
if (Prcb->CpuType <= 4)
|
||||
{
|
||||
/* 486's or equal can't go higher then 10ms */
|
||||
HalpLargestClockMS = 10;
|
||||
HalpNextMSRate = 9;
|
||||
}
|
||||
|
||||
/* Get increment and rollover for the largest time clock ms possible */
|
||||
Increment = HalpRolloverTable[HalpLargestClockMS - 1].HighPart;
|
||||
RollOver = (USHORT)HalpRolloverTable[HalpLargestClockMS - 1].LowPart;
|
||||
|
||||
/* Set the maximum and minimum increment with the kernel */
|
||||
HalpCurrentTimeIncrement = Increment;
|
||||
KeSetTimeIncrement(Increment, HalpRolloverTable[0].HighPart);
|
||||
|
||||
/* Disable interrupts */
|
||||
Flags = __readeflags();
|
||||
_disable();
|
||||
|
|
@ -98,9 +104,31 @@ HalpInitializeClock(VOID)
|
|||
|
||||
/* Restore interrupts if they were previously enabled */
|
||||
__writeeflags(Flags);
|
||||
}
|
||||
|
||||
/* Save rollover and return */
|
||||
VOID
|
||||
NTAPI
|
||||
INIT_FUNCTION
|
||||
HalpInitializeClock(VOID)
|
||||
{
|
||||
ULONG Increment;
|
||||
USHORT RollOver;
|
||||
|
||||
DPRINT("HalpInitializeClock()\n");
|
||||
|
||||
/* Get increment and rollover for the largest time clock ms possible */
|
||||
Increment = HalpRolloverTable[HalpLargestClockMS - 1].Increment;
|
||||
RollOver = (USHORT)HalpRolloverTable[HalpLargestClockMS - 1].RollOver;
|
||||
|
||||
/* Set the maximum and minimum increment with the kernel */
|
||||
KeSetTimeIncrement(Increment, HalpRolloverTable[0].Increment);
|
||||
|
||||
/* Set the rollover value for the timer */
|
||||
HalpSetTimerRollOver(RollOver);
|
||||
|
||||
/* Save rollover and increment */
|
||||
HalpCurrentRollOver = RollOver;
|
||||
HalpCurrentTimeIncrement = Increment;
|
||||
}
|
||||
|
||||
#ifdef _M_IX86
|
||||
|
|
@ -109,6 +137,7 @@ VOID
|
|||
FASTCALL
|
||||
HalpClockInterruptHandler(IN PKTRAP_FRAME TrapFrame)
|
||||
{
|
||||
ULONG LastIncrement;
|
||||
KIRQL Irql;
|
||||
|
||||
/* Enter trap */
|
||||
|
|
@ -121,16 +150,25 @@ HalpClockInterruptHandler(IN PKTRAP_FRAME TrapFrame)
|
|||
HalpPerfCounter.QuadPart += HalpCurrentRollOver;
|
||||
HalpPerfCounterCutoff = KiEnableTimerWatchdog;
|
||||
|
||||
/* Save increment */
|
||||
LastIncrement = HalpCurrentTimeIncrement;
|
||||
|
||||
/* Check if someone changed the time rate */
|
||||
if (HalpClockSetMSRate)
|
||||
{
|
||||
/* Not yet supported */
|
||||
UNIMPLEMENTED;
|
||||
ASSERT(FALSE);
|
||||
/* Update the global values */
|
||||
HalpCurrentTimeIncrement = HalpRolloverTable[HalpNextMSRate - 1].Increment;
|
||||
HalpCurrentRollOver = HalpRolloverTable[HalpNextMSRate - 1].RollOver;
|
||||
|
||||
/* Set new timer rollover */
|
||||
HalpSetTimerRollOver((USHORT)HalpCurrentRollOver);
|
||||
|
||||
/* We're done */
|
||||
HalpClockSetMSRate = FALSE;
|
||||
}
|
||||
|
||||
/* Update the system time -- the kernel will exit this trap */
|
||||
KeUpdateSystemTime(TrapFrame, HalpCurrentTimeIncrement, Irql);
|
||||
KeUpdateSystemTime(TrapFrame, LastIncrement, Irql);
|
||||
}
|
||||
|
||||
/* Spurious, just end the interrupt */
|
||||
|
|
@ -206,7 +244,58 @@ HalSetTimeIncrement(IN ULONG Increment)
|
|||
HalpClockSetMSRate = TRUE;
|
||||
|
||||
/* Return the increment */
|
||||
return HalpRolloverTable[Increment - 1].HighPart;
|
||||
return HalpRolloverTable[Increment - 1].Increment;
|
||||
}
|
||||
|
||||
LARGE_INTEGER
|
||||
NTAPI
|
||||
KeQueryPerformanceCounter(PLARGE_INTEGER PerformanceFrequency)
|
||||
{
|
||||
LARGE_INTEGER CurrentPerfCounter;
|
||||
ULONG CounterValue, ClockDelta;
|
||||
|
||||
/* If caller wants performance frequency, return hardcoded value */
|
||||
if (PerformanceFrequency) PerformanceFrequency->QuadPart = PIT_FREQUENCY;
|
||||
|
||||
/* Check if we were called too early */
|
||||
if (HalpCurrentRollOver == 0) return HalpPerfCounter;
|
||||
|
||||
/* Check if interrupts are disabled */
|
||||
if(!(__readeflags() & EFLAGS_INTERRUPT_MASK)) return HalpPerfCounter;
|
||||
|
||||
do
|
||||
{
|
||||
/* Get the current performance counter value */
|
||||
CurrentPerfCounter = HalpPerfCounter;
|
||||
|
||||
/* Read the 8254 counter value */
|
||||
CounterValue = HalpRead8254Value();
|
||||
|
||||
/* Repeat if the value has changed (a clock interrupt happened) */
|
||||
} while (CurrentPerfCounter.QuadPart != HalpPerfCounter.QuadPart);
|
||||
|
||||
/* After someone changed the clock rate, during the first clock cycle we
|
||||
might see a counter value larger than the rollover. In this case we
|
||||
pretend it already has the new rollover value. */
|
||||
if (CounterValue > HalpCurrentRollOver) CounterValue = HalpCurrentRollOver;
|
||||
|
||||
/* The interrupt is issued on the falling edge of the OUT line, when the
|
||||
counter changes from 1 to max. Calculate a clock delta, so that directly
|
||||
after the interrupt it is 0, going up to (HalpCurrentRollOver - 1). */
|
||||
ClockDelta = HalpCurrentRollOver - CounterValue;
|
||||
|
||||
/* Add the clock delta */
|
||||
CurrentPerfCounter.QuadPart += ClockDelta;
|
||||
|
||||
/* This must be true unless HalpPerfCounter has changed sign,
|
||||
which takes approximately 245,118 years */
|
||||
ASSERT(CurrentPerfCounter.QuadPart >= HalpLastPerfCounter.QuadPart);
|
||||
|
||||
/* Update the last counter value */
|
||||
HalpLastPerfCounter = CurrentPerfCounter;
|
||||
|
||||
/* Return the result */
|
||||
return CurrentPerfCounter;
|
||||
}
|
||||
|
||||
/* EOF */
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue