em_in
I2bvIP(DstDI | SrcDX | Mov | String | Unaligned, em_in, ins, check_perm_in), /* insb, insw/insd */
I2bvIP(SrcImmUByte | DstAcc, em_in, in, check_perm_in),
I2bvIP(SrcDX | DstAcc, em_in, in, check_perm_in),
struct extent_map **em_in, u64 start, u64 len)
struct extent_map *em = *em_in;
*em_in = existing;
*em_in = NULL;
struct extent_map **em_in, u64 start, u64 len);