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From: codeFather on 17 Jun 2010 04:14
the following code stops the interrupts on the both the processors , but
nothing happens, i am able use the mouse and keyboard as usual (was expecting
a reboot or bsod :S) whats going on here?

#include "ntddk.h"
#include <windef.h>

int i;
HANDLE thrHwnd;
KEVENT syncEvent;
BOOL processors[16];
int totalProcessors,processorsMarked;

void displayCpuName()
{
if (processors[KeGetCurrentProcessorNumber()]==TRUE)
{
DbgPrint("The Processor %d, ran the code
before!!",KeGetCurrentProcessorNumber());
KeSetEvent(&syncEvent,0,FALSE);
PsTerminateSystemThread(0);
return;
}
else
{
DbgPrint("The Processor %d, is running the code for the first
time",KeGetCurrentProcessorNumber());
__asm{
cli
}
processors[KeGetCurrentProcessorNumber()]=TRUE;
processorsMarked++;
KeSetEvent(&syncEvent,0,FALSE);
PsTerminateSystemThread(0);
return;
}
}

NTSTATUS onUnload (IN PDRIVER_OBJECT driverObject)
{
DbgPrint("Driver Unloaded Successfully");
return STATUS_SUCCESS;
}

NTSTATUS DriverEntry (IN PDRIVER_OBJECT driverObject, IN PUNICODE_STRING
registryPath)
{
DbgPrint("Driver Loaded Successfully");
driverObject->DriverUnload = onUnload;

processorsMarked = 0;
for(i = 0; i < 16;i++)
processors[i] = FALSE;
totalProcessors = KeNumberProcessors;

KeInitializeEvent(&syncEvent,SynchronizationEvent,FALSE);
while(TRUE)
{
PsCreateSystemThread(&thrHwnd,(ACCESS_MASK)
0L,NULL,NULL,NULL,(PKSTART_ROUTINE) displayCpuName,NULL);
KeWaitForSingleObject(&syncEvent,Executive,KernelMode,FALSE,NULL);
if(processorsMarked == totalProcessors) break;
}
return STATUS_SUCCESS;
}

thanks!
From: SdB on 17 Jun 2010 11:04
You may want to run a thread on a dedicated cpu core by setting the thread
affinity.
KeGetCurrentProcessorNumber() might return not the correct number as your
thread is running at passive level. That would be something to consider.

-Stefan

"codeFather" wrote:

> the following code stops the interrupts on the both the processors , but
> nothing happens, i am able use the mouse and keyboard as usual (was expecting
> a reboot or bsod :S) whats going on here?
>
> #include "ntddk.h"
> #include <windef.h>
>
> int i;
> HANDLE thrHwnd;
> KEVENT syncEvent;
> BOOL processors[16];
> int totalProcessors,processorsMarked;
>
> void displayCpuName()
> {
> if (processors[KeGetCurrentProcessorNumber()]==TRUE)
> {
> DbgPrint("The Processor %d, ran the code
> before!!",KeGetCurrentProcessorNumber());
> KeSetEvent(&syncEvent,0,FALSE);
> PsTerminateSystemThread(0);
> return;
> }
> else
> {
> DbgPrint("The Processor %d, is running the code for the first
> time",KeGetCurrentProcessorNumber());
> __asm{
> cli
> }
> processors[KeGetCurrentProcessorNumber()]=TRUE;
> processorsMarked++;
> KeSetEvent(&syncEvent,0,FALSE);
> PsTerminateSystemThread(0);
> return;
> }
> }
>
> NTSTATUS onUnload (IN PDRIVER_OBJECT driverObject)
> {
> DbgPrint("Driver Unloaded Successfully");
> return STATUS_SUCCESS;
> }
>
> NTSTATUS DriverEntry (IN PDRIVER_OBJECT driverObject, IN PUNICODE_STRING
> registryPath)
> {
> DbgPrint("Driver Loaded Successfully");
> driverObject->DriverUnload = onUnload;
>
> processorsMarked = 0;
> for(i = 0; i < 16;i++)
> processors[i] = FALSE;
> totalProcessors = KeNumberProcessors;
>
> KeInitializeEvent(&syncEvent,SynchronizationEvent,FALSE);
> while(TRUE)
> {
> PsCreateSystemThread(&thrHwnd,(ACCESS_MASK)
> 0L,NULL,NULL,NULL,(PKSTART_ROUTINE) displayCpuName,NULL);
> KeWaitForSingleObject(&syncEvent,Executive,KernelMode,FALSE,NULL);
> if(processorsMarked == totalProcessors) break;
> }
> return STATUS_SUCCESS;
> }
>
> thanks!
From: Pavel A. on 17 Jun 2010 21:38
"codeFather" <codeFather(a)discussions.microsoft.com> wrote in message
news:EDADDFA3-B24D-4650-B4C1-C4A3252AF2C4(a)microsoft.com...
> the following code stops the interrupts on the both the processors , but
> nothing happens, i am able use the mouse and keyboard as usual (was
> expecting
> a reboot or bsod :S) whats going on here?

Whenever you call some system function, it can enable interrupts again.
Cli is not a blessed way to disable local interrupts in NT.

--pa


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