private static bool IsCmpxchg16bSupported()
{
byte[] getCpuIdCode = new byte[]
{
0x53, // push rbx
0xb8, 0x01, 0x00, 0x00, 0x00, // mov eax, 0x1
0x0f, 0xa2, // cpuid
0x89, 0xc8, // mov eax, ecx
0x5b, // pop rbx
0xc3 // ret
};
IntPtr funcPtr = MapCodeAsExecutable(getCpuIdCode);
GetCpuId getCpuId = Marshal.GetDelegateForFunctionPointer <GetCpuId>(funcPtr);
int cpuId = getCpuId();
MemoryAlloc.Free(funcPtr);
return((cpuId & (1 << 13)) != 0);
}
private static IntPtr MapCodeAsExecutable(byte[] code)
{
ulong codeLength = (ulong)code.Length;
IntPtr funcPtr = MemoryAlloc.Allocate(codeLength);
unsafe
{
fixed(byte *codePtr = code)
{
byte *dest = (byte *)funcPtr;
long size = (long)codeLength;
Buffer.MemoryCopy(codePtr, dest, size, size);
}
}
MemoryAlloc.Reprotect(funcPtr, codeLength, MemoryProtection.Execute);
return(funcPtr);
}