#define OUT
#define IN
BOOL __stdcall SDI_VirtualProtect(
					IN LPVOID lpAddress,       // region of committed pages
					IN SIZE_T dwSize,          // size of the region
					IN DWORD flNewProtect,     // desired access protection
					OUT PDWORD lpflOldProtect   // old protection
					)
{
	BOOL bResult;
	lpAddress = (LPVOID)((DWORD)lpAddress & 0xFFFFF000);

	__asm
	{
		jmp L_X0;
	}

C_SysEnter:
	__asm 
	{
		mov edx, esp;
		__asm _emit 0x0F;//sysenter
		__asm _emit 0x34;
		ret;
	}

C_NTVitrualProtect:
	__asm
	{
		mov eax, 0x89;
		call C_SysEnter;
		ret 0x14;
	}

L_X0:
	__asm
	{
		push lpflOldProtect;
		push flNewProtect;
		lea eax, dwSize;
		push eax;
		lea eax, lpAddress;
		push eax;
		push -1;
		call C_NTVitrualProtect;
		test eax, eax;
		jnz L_X1;
		inc eax;
		jmp L_X2;
L_X1:
		xor eax, eax;
L_X2:
		mov bResult, eax;
	}
                return bResult;
}