InterlockedCompareExchange64.c

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UINT64
EFIAPI
InternalSyncCompareExchange64 (
  IN      volatile UINT64  *Value,
  IN      UINT64           CompareValue,
  IN      UINT64           ExchangeValue
  )
{
  _asm {
    mov     esi, Value
    mov     eax, dword ptr [CompareValue + 0]
    mov     edx, dword ptr [CompareValue + 4]
    mov     ebx, dword ptr [ExchangeValue + 0]
    mov     ecx, dword ptr [ExchangeValue + 4]
    lock    cmpxchg8b   qword ptr [esi]
  }
}