int __fastcall VgaModeProgramGc(int this, unsigned int a2)
{
  int v3; // edx
  unsigned int v4; // esi
  int v5; // ecx
  unsigned int v6; // edi
  int v7; // ecx
  int v8; // ecx
  int v9; // ecx
  int v10; // ecx
  int v11; // ecx
  int v12; // ecx
  int v13; // ecx

  v4 = PciRegRead(*(_DWORD *)(this + 60), 510525444) & 0xFFFFFFFC;
  v6 = PciRegRead(v5, v3 + 16) & 0xFFFFFF00;
  PciRegWrite(v7, -1609564160, 1094861636);
  PciRegWrite(v8, -1877999616, 892745528);
  PciRegWrite(v9, -2012217344, 690629420);
  PciRegWrite(v10, -2146435072, 488513296);
  if ( PciRegRead(v11, -1609564160) == 1094861636 )
  {
    v4 |= 3u;
    a2 >>= 24;
  }
  else
  {
    if ( PciRegRead(v12, -1877999616) == 892745528 )
    {
      v4 |= 2u;
      a2 >>= 16;
    }
    else if ( PciRegRead(v12, -2012217344) == 690629420 )
    {
      v4 |= 1u;
      a2 >>= 8;
    }
    a2 = (unsigned __int8)a2;
  }
  PciRegWrite(v12, 510525444, v4);
  return PciRegWrite(v13, 510525460, a2 | v6);
}