This commit introduces a noticeable delay in VirtualBox:

1) When booting from the CD to install ROS, after FreeLDR has initially loaded and the screen becomes black, here I notice a delay of 6~7 seconds until I see the blue screen to choose the language in usetup. Before the commit it was about 1 sec.

2) In second stage when loading UniATA, it stays there for about 4-5 seconds, there was no delay before.


Best regards,
Gabriel.


> Date: Tue, 27 Oct 2009 01:03:41 +0000
> To: ros-diffs@reactos.org
> From: sginsberg@svn.reactos.org
> Subject: [ros-diffs] [sginsberg] 43789: - Replace broken implementation of HalpCalibrateStallExecution with a new implementation by a mysterious HAL ninja and myself. The old implementation calculated the stall count factor incorrectly and produced bogus results that were off by several thousand, and varied by as much for each boot, and can best be described as "rand() made complicated". The new implementation installs its own RTC interrupt handler to accurately calculate the stall scale factor, all done in assembler instead of broken C. Fixes the hang at boot when initializing Uniata as stalls no longer takes 10 times or more as long to execute then they should.
>
> Author: sginsberg
> Date: Tue Oct 27 02:03:41 2009
> New Revision: 43789
>
> URL: http://svn.reactos.org/svn/reactos?rev=43789&view=rev
> Log:
> - Replace broken implementation of HalpCalibrateStallExecution with a new implementation by a mysterious HAL ninja and myself. The old implementation calculated the stall count factor incorrectly and produced bogus results that were off by several thousand, and varied by as much for each boot, and can best be described as "rand() made complicated". The new implementation installs its own RTC interrupt handler to accurately calculate the stall scale factor, all done in assembler instead of broken C. Fixes the hang at boot when initializing Uniata as stalls no longer takes 10 times or more as long to execute then they should.
>
> Modified:
> trunk/reactos/hal/halx86/generic/halinit.c
> trunk/reactos/hal/halx86/generic/systimer.S
> trunk/reactos/hal/halx86/generic/timer.c
>
> Modified: trunk/reactos/hal/halx86/generic/halinit.c
> URL: http://svn.reactos.org/svn/reactos/trunk/reactos/hal/halx86/generic/halinit.c?rev=43789&r1=43788&r2=43789&view=diff
> ==============================================================================
> --- trunk/reactos/hal/halx86/generic/halinit.c [iso-8859-1] (original)
> +++ trunk/reactos/hal/halx86/generic/halinit.c [iso-8859-1] Tue Oct 27 02:03:41 2009
> @@ -97,11 +97,11 @@
> /* Force initial PIC state */
> KfRaiseIrql(KeGetCurrentIrql());
>
> + /* Setup busy waiting */
> + HalpCalibrateStallExecution();
> +
> /* Initialize the clock */
> HalpInitializeClock();
> -
> - /* Setup busy waiting */
> - HalpCalibrateStallExecution();
>
> /* Fill out the dispatch tables */
> HalQuerySystemInformation = HaliQuerySystemInformation;
>
> Modified: trunk/reactos/hal/halx86/generic/systimer.S
> URL: http://svn.reactos.org/svn/reactos/trunk/reactos/hal/halx86/generic/systimer.S?rev=43789&r1=43788&r2=43789&view=diff
> ==============================================================================
> --- trunk/reactos/hal/halx86/generic/systimer.S [iso-8859-1] (original)
> +++ trunk/reactos/hal/halx86/generic/systimer.S [iso-8859-1] Tue Oct 27 02:03:41 2009
> @@ -17,11 +17,386 @@
> _HalpLastPerfCounterHigh: .long 0
> _HalpPerfCounterLow: .long 0
> _HalpPerfCounterHigh: .long 0
> +_HalpSystemHardwareLock: .long 0
> +_HalpSystemHardwareFlags: .long 0
>
> _UnhandledMsg:
> .asciz "\n\x7\x7!!! Unhandled or Unexpected Code at line: %lx!!!\n"
>
> /* FUNCTIONS *****************************************************************/
> +
> +.global _HalpReleaseCmosSpinLock@0
> +.func HalpReleaseCmosSpinLock@0
> +_HalpReleaseCmosSpinLock@0:
> +
> +#ifdef CONFIG_SMP
> + /* Save clobbered register */
> + push eax
> +
> + /* Push saved EFLAGS */
> + push _HalpSystemHardwareFlags
> +
> + /* Release the lock */
> + lea eax, _HalpSystemHardwareLock
> + RELEASE_SPINLOCK(eax)
> +
> + /* Restore EFLAGS */
> + popf
> +
> + /* Return */
> + pop eax
> + ret
> +#else
> + /* Restore EFLAGS and return */
> + push _HalpSystemHardwareFlags
> + popf
> + ret
> +#endif
> +.endfunc
> +
> +.global _HalpAcquireSystemHardwareSpinLock@0
> +.func HalpAcquireSystemHardwareSpinLock@0
> +_HalpAcquireSystemHardwareSpinLock@0:
> +
> +#ifdef CONFIG_SMP
> + /* Save clobbered register */
> + push eax
> +
> +HardwareLock:
> + /* Save EFLAGS and disable interrupts */
> + pushf
> + cli
> +
> + /* This is the CMOS lock, acquire it */
> + lea eax, _HalpSystemHardwareLock
> + ACQUIRE_SPINLOCK(eax, CmosSpin)
> +
> + /* We have it, return the flags */
> + pop _HalpSystemHardwareFlags
> + pop eax
> + ret
> +
> +CmosSpin:
> +
> + /* Restore EFLAGS */
> + pushf _HalpSystemHardwareLock
> + popf
> +
> + /* Spin */
> + SPIN_ON_LOCK(eax, HardwareLock)
> +
> +#else
> + /* Save EFLAGS, disable interrupts and return */
> + pushf
> + cli
> + pop _HalpSystemHardwareFlags
> + ret
> +#endif
> +.endfunc
> +
> +.global _HalpCalibrateStallExecution@0
> +.func HalpCalibrateStallExecution@0
> +_HalpCalibrateStallExecution@0:
> +
> + /* Setup the stack frame */
> + push ebp
> + mov ebp, esp
> + sub esp, 12
> +
> + /* Save EFLAGS and kill interrupts */
> + pushf
> + cli
> +
> + /* Get the current interrupt mask on the PICs */
> + xor eax, eax
> + in al, 0xA1
> + shl eax, 8
> + in al, 0x21
> +
> + /* Save it */
> + push eax
> +
> + /* Now mask everything except the RTC and PIC 2 chain-interrupt */
> + mov eax, ~((1 << 2) | (1 << 8))
> +
> + /* Program the PICs */
> + out 0x21, al
> + shr eax, 8
> + out 0xA1, al
> +
> + /* Now get the IDT */
> + sidt [ebp-8]
> + mov ecx, [ebp-6]
> +
> + /* Get the IDT entry for the RTC */
> + mov eax, 0x38
> + shl eax, 3
> + add ecx, eax
> +
> + /* Save the original RTC ISR */
> + push [ecx]
> + push [ecx+4]
> + push ecx
> +
> + /* Now load our new handler */
> + mov eax, offset OnlyOnePersonCanWriteHalCode
> + mov [ecx], ax
> + mov word ptr [ecx+2], KGDT_R0_CODE
> + mov word ptr [ecx+4], 0x8E00
> + shr eax, 16
> + mov [ecx+6], ax
> +
> + /* Reset our counter */
> + mov dword ptr [ebp-12], 0
> +
> + /* Acquire CMOS lock */
> + call _HalpAcquireSystemHardwareSpinLock@0
> +
> + /* Now initialize register A on the CMOS */
> + mov ax, (0x2D << 8) | 0xA
> + out 0x70, al
> + jmp $+2
> + mov al, ah
> + out 0x71, al
> + jmp $+2
> +
> + /* Read register B */
> + mov ax, 0xB
> + out 0x70, al
> + jmp $+2
> + in al, 0x71
> + jmp $+2
> +
> + /* Don't touch the LastKnownGoodConfig hack */
> + and al, 1
> + mov ah, al
> +
> + /* Enable the interrupt */
> + or ah, 0x42
> +
> + /* Now write the register B */
> + mov al, 0xB
> + out 0x70, al
> + jmp $+2
> + mov al, ah
> + out 0x71, al
> + jmp $+2
> +
> + /* Read register C */
> + mov al, 0xC
> + out 0x70, al
> + jmp $+2
> + in al, 0x71
> + jmp $+2
> +
> + /* Read register D */
> + mov al, 0xD
> + out 0x70, al
> + jmp $+2
> + in al, 0x71
> + jmp $+2
> +
> + /* Release CMOS lock */
> + mov dword ptr [ebp-12], 0
> + call _HalpReleaseCmosSpinLock@0
> +
> + /* Initialize looper */
> + xor eax, eax
> +
> + /* Align to 16 bytes */
> + .align 16
> +
> + /* Enable interrupts! */
> + sti
> + jmp Looper
> +
> + /* Align to 16 bytes */
> + .align 16
> +
> + /* Subtract one count */
> +Looper:
> + sub eax, 1
> + jnz Looper
> +
> + /* ASSERT: If we got here, then the RTC never fired */
> + call _DbgBreakPoint@0
> + jmp Looper
> +
> +OnlyOnePersonCanWriteHalCode:
> + /*********************** THIS IS THE RTC HANDLER **************************/
> +
> + /* Increment the interrupt count and check if this is the first one */
> + inc dword ptr [ebp-12]
> + cmp dword ptr [ebp-12], 1
> + jnz ComputeStall
> +
> + /*
> + * It is the first one -- we'll ignore it, since it fires randomly!
> + * Get rid of the old return address and push the new one in (our looper)
> + */
> + pop eax
> + push offset Looper
> +
> + /* Acquire CMOS lock */
> + call _HalpAcquireSystemHardwareSpinLock@0
> +
> + /* Now initialize register A on the CMOS */
> + mov ax, (0x2D << 8) | 0xA
> + out 0x70, al
> + jmp $+2
> + mov al, ah
> + out 0x71, al
> + jmp $+2
> +
> + /* Read register B */
> + mov ax, 0xB
> + out 0x70, al
> + jmp $+2
> + in al, 0x71
> + jmp $+2
> +
> + /* Don't touch the LastKnownGoodConfig hack */
> + and al, 1
> + mov ah, al
> +
> + /* Enable the interrupt */
> + or ah, 0x42
> +
> + /* Now write the register B */
> + mov al, 0xB
> + out 0x70, al
> + jmp $+2
> + mov al, ah
> + out 0x71, al
> + jmp $+2
> +
> + /* Read register C */
> + mov al, 0xC
> + out 0x70, al
> + jmp $+2
> + in al, 0x71
> + jmp $+2
> +
> + /* Read register D */
> + mov al, 0xD
> + out 0x70, al
> + jmp $+2
> + in al, 0x71
> + jmp $+2
> +
> + /* Release CMOS lock */
> + call _HalpReleaseCmosSpinLock@0
> +
> + /* Dismiss the interrupt */
> + mov al, 0x20
> + out 0xA0, al
> + mov al, 0x62
> + out 0x20, al
> +
> + /* Reset the counter and return back to the looper */
> + xor eax, eax
> + iretd
> +
> + /******************* THIS IS THE 2ND RTC HANDLER **************************/
> +ComputeStall:
> +
> + /* Do the calculation */
> + neg eax
> + xor edx, edx
> + mov ecx, 125000 /* RTC fires every 125 ms */
> + div ecx
> +
> + /* Is the remainder 0? */
> + cmp edx, 0
> + jz FoundFactor
> +
> + /* Otherwise fix-up the loop count */
> + inc eax
> +
> +FoundFactor:
> + /* Save the stall scale factor */
> + mov fs:[KPCR_STALL_SCALE_FACTOR], eax
> +
> + /* Prepare for interrupt return */
> + pop eax
> + push offset AndItsNotYou
> + mov eax, 0x13
> +
> + /* Acquire CMOS lock */
> + call _HalpAcquireSystemHardwareSpinLock@0
> +
> + /* Now initialize register A on the CMOS */
> + mov ax, (0x2D << 8) | 0xA
> + out 0x70, al
> + jmp $+2
> + mov al, ah
> + out 0x71, al
> + jmp $+2
> +
> + /* Read register B */
> + mov ax, 0xB
> + out 0x70, al
> + jmp $+2
> + in al, 0x71
> + jmp $+2
> +
> + /* Don't touch the LastKnownGoodConfig hack */
> + and al, 1
> + mov ah, al
> +
> + /* Disable the interrupt */
> + or ah, 0x2
> +
> + /* Now write the register B */
> + mov al, 0xB
> + out 0x70, al
> + jmp $+2
> + mov al, ah
> + out 0x71, al
> + jmp $+2
> +
> + /* Read register C */
> + mov al, 0xC
> + out 0x70, al
> + jmp $+2
> + in al, 0x71
> + jmp $+2
> +
> + /* Release CMOS lock */
> + call _HalpReleaseCmosSpinLock@0
> +
> + /* Dismiss the interrupt */
> + mov al, 0x20
> + out 0xA0, al
> + mov al, 0x62
> + out 0x20, al
> +
> + /* Disable interrupts on return */
> + and word ptr [esp+8], ~EFLAGS_INTERRUPT_MASK
> + iretd
> +
> + /************************* WE ARE BACK FROM RTC ***************************/
> +AndItsNotYou:
> +
> + /* Restore the IDT */
> + pop ecx
> + pop [ecx+4]
> + pop [ecx]
> +
> + /* Restore the mask */
> + pop eax
> + out 0x21, al
> + shr eax, 8
> + out 0xA1, al
> +
> + /* Restore EFLAGS */
> + popf
> +
> + /* Restore stack and return */
> + mov esp, ebp
> + pop ebp
> + ret
> +.endfunc
>
> .globl _KeStallExecutionProcessor@4
> .func KeStallExecutionProcessor@4
> @@ -53,34 +428,6 @@
> /* Return */
> ret 4
> .endfunc
> -
> -
> -.globl _HalpQuery8254Counter@0
> -.func HalpQuery8254Counter@0
> -_HalpQuery8254Counter@0:
> -
> - /* Save EFLAGS and disable interrupts */
> - pushfd
> - cli
> -
> - /* Set timer data */
> - mov al, 0
> - out 0x43, al
> - jmp $+2
> -
> - /* Read current timer */
> - in al, 0x40
> - jmp $+2
> - movzx ecx, al
> - in al, 0x40
> - mov ch, al
> -
> - /* Return it and restore interrupt state */
> - mov eax, ecx
> - popfd
> - ret
> -.endfunc
> -
>
> .global _KeQueryPerformanceCounter@4
> .func KeQueryPerformanceCounter@4
>
> Modified: trunk/reactos/hal/halx86/generic/timer.c
> URL: http://svn.reactos.org/svn/reactos/trunk/reactos/hal/halx86/generic/timer.c?rev=43789&r1=43788&r2=43789&view=diff
> ==============================================================================
> --- trunk/reactos/hal/halx86/generic/timer.c [iso-8859-1] (original)
> +++ trunk/reactos/hal/halx86/generic/timer.c [iso-8859-1] Tue Oct 27 02:03:41 2009
> @@ -13,11 +13,6 @@
> #include <debug.h>
>
> /* GLOBALS *******************************************************************/
> -
> -/* time to wait */
> -#define MICROSECOND_TO_WAIT 1000
> -/* the tick count for 1 ms is 1193.182 (1193182 Hz) round it up */
> -#define TICKCOUNT_TO_WAIT 1194
>
> BOOLEAN HalpClockSetMSRate;
> ULONG HalpCurrentTimeIncrement;
> @@ -135,161 +130,4 @@
> return HalpRolloverTable[Increment - 1].HighPart;
> }
>
> -ULONG
> -WaitFor8254Wraparound(VOID)
> -{
> - ULONG StartTicks;
> - ULONG PrevTicks;
> - LONG Delta;
> -
> - StartTicks = HalpQuery8254Counter();
> -
> - do
> - {
> - PrevTicks = StartTicks;
> - StartTicks = HalpQuery8254Counter();
> - Delta = StartTicks - PrevTicks;
> -
> - /*
> - * This limit for delta seems arbitrary, but it isn't, it's
> - * slightly above the level of error a buggy Mercury/Neptune
> - * chipset timer can cause.
> - */
> -
> - }
> - while (Delta < 300);
> -
> - return StartTicks;
> -}
> -
> -VOID
> -NTAPI
> -HalpCalibrateStallExecution(VOID)
> -{
> - ULONG CalibrationBit;
> - ULONG EndTicks;
> - ULONG StartTicks;
> - ULONG OverheadTicks;
> - PKIPCR Pcr;
> -
> - Pcr = (PKIPCR)KeGetPcr();
> -
> - /* Measure the delay for the minimum call overhead in ticks */
> - Pcr->StallScaleFactor = 1;
> - StartTicks = WaitFor8254Wraparound();
> - KeStallExecutionProcessor(1);
> - EndTicks = HalpQuery8254Counter();
> - OverheadTicks = (StartTicks - EndTicks);
> -
> - do
> - {
> - /* Increase the StallScaleFactor */
> - Pcr->StallScaleFactor = Pcr->StallScaleFactor * 2;
> -
> - if (Pcr->StallScaleFactor == 0)
> - {
> - /* Nothing found */
> - break;
> - }
> -
> - /* Get the start ticks */
> - StartTicks = WaitFor8254Wraparound();
> -
> - /* Wait for a defined time */
> - KeStallExecutionProcessor(MICROSECOND_TO_WAIT);
> -
> - /* Get the end ticks */
> - EndTicks = HalpQuery8254Counter();
> -
> - DPRINT("Pcr->StallScaleFactor: %d\n", Pcr->StallScaleFactor);
> - DPRINT("Time1 : StartTicks %i - EndTicks %i = %i\n",
> - StartTicks, EndTicks, StartTicks - EndTicks);
> - } while ((StartTicks - EndTicks) <= (TICKCOUNT_TO_WAIT + OverheadTicks));
> -
> - /* A StallScaleFactor lesser than INITIAL_STALL_COUNT makes no sense */
> - if (Pcr->StallScaleFactor >= (INITIAL_STALL_COUNT * 2))
> - {
> - /* Adjust the StallScaleFactor */
> - Pcr->StallScaleFactor = Pcr->StallScaleFactor / 2;
> -
> - /* Setup the CalibrationBit */
> - CalibrationBit = Pcr->StallScaleFactor;
> -
> - for (;;)
> - {
> - /* Lower the CalibrationBit */
> - CalibrationBit = CalibrationBit / 2;
> - if (CalibrationBit == 0)
> - {
> - break;
> - }
> -
> - /* Add the CalibrationBit */
> - Pcr->StallScaleFactor = Pcr->StallScaleFactor + CalibrationBit;
> -
> - /* Get the start ticks */
> - StartTicks = WaitFor8254Wraparound();
> -
> - /* Wait for a defined time */
> - KeStallExecutionProcessor(MICROSECOND_TO_WAIT);
> -
> - /* Get the end ticks */
> - EndTicks = HalpQuery8254Counter();
> -
> - DPRINT("Pcr->StallScaleFactor: %d\n", Pcr->StallScaleFactor);
> - DPRINT("Time2 : StartTicks %i - EndTicks %i = %i\n",
> - StartTicks, EndTicks, StartTicks - EndTicks);
> -
> - if ((StartTicks-EndTicks) > (TICKCOUNT_TO_WAIT+OverheadTicks))
> - {
> - /* Too big so subtract the CalibrationBit */
> - Pcr->StallScaleFactor = Pcr->StallScaleFactor - CalibrationBit;
> - }
> - }
> - DPRINT("New StallScaleFactor: %d\n", Pcr->StallScaleFactor);
> - }
> - else
> - {
> - /* Set StallScaleFactor to the default */
> - Pcr->StallScaleFactor = INITIAL_STALL_COUNT;
> - }
> -
> -#if 0
> - /* For debugging */
> - ULONG i;
> -
> - DPRINT1("About to start delay loop test\n");
> - DPRINT1("Waiting for a minute...");
> - for (i = 0; i < (60*1000*20); i++)
> - {
> - KeStallExecutionProcessor(50);
> - }
> - DPRINT1("finished\n");
> -
> -
> - DPRINT1("About to start delay loop test\n");
> - DPRINT1("Waiting for a minute...");
> - for (i = 0; i < (60*1000); i++)
> - {
> - KeStallExecutionProcessor(1000);
> - }
> - DPRINT1("finished\n");
> -
> -
> - DPRINT1("About to start delay loop test\n");
> - DPRINT1("Waiting for a minute...");
> - for (i = 0; i < (60*1000*1000); i++)
> - {
> - KeStallExecutionProcessor(1);
> - }
> - DPRINT1("finished\n");
> -
> - DPRINT1("About to start delay loop test\n");
> - DPRINT1("Waiting for a minute...");
> - KeStallExecutionProcessor(60*1000000);
> - DPRINT1("finished\n");
> -#endif
> -}
> -
> -
> /* EOF */
>
>

---

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