Prefetch Input Queue (PIQ)

//This function can be used to detect whether the processor still supports PIQ (Prefetch Input Queue).
//At the time all processors supported PIQ, this was used as an anti-tracing trick.
#include "stdafx.h"
#include "windows.h"
#include "iostream.h"


bool IsPIQSupported()
{
    unsigned long old;
    void* addr=0;
    //-----------Get EIP----------------
    unsigned long result=0;
    __asm
    {
             pushad
             call here
here:
             pop ebx
             mov addr,ebx
             popad
    }

    //-------------------------Allow Write Access-----------------------
    VirtualProtect(addr,100,PAGE_EXECUTE_READWRITE,&old);
    //-------------------------Check for support------------------------
    __asm
    {
             pushad
             XOR EAX,EAX
             XOR ECX,ECX
             MOV AL,0x40
             MOV CL,0x6
             MOV EDI,offset shit
             STD
             REP STOS BYTE PTR ES:[EDI]
             NOP
             NOP
             NOP
shit:
             NOP
             CLD
             mov result,eax
             popad
    };
    //----------------------Restore Original-----------------------
    VirtualProtect(addr,100,old,&old);
    if(result==0x44) return true;
    return false;
}




int main(int argc, char* argv[])
{
    unsigned long old;
    void* addr=0;
    if(IsPIQSupported())
    {
        cout<<"PIQ is supported"<<endl;
    }
    else
    {
        cout<<"PIQ is not supported"<<endl;
    }
    return 0;
}