| |
| .text |
| /* |
| * This is a version of ip_compute_csum() optimized for IP headers, |
| * which always checksum on 4 octet boundaries. |
| * |
| * extern __sum16 ip_fast_csum(const void *iph, unsigned int ihl); |
| * |
| */ |
| .global _ip_fast_csum |
| .type _ip_fast_csum,function |
| _ip_fast_csum: |
| !! TXRPT needs loops - 1 |
| SUBS TXRPT,D0Ar2,#1 |
| MOV D0Re0,#0 |
| BLO $Lfast_csum_exit |
| $Lfast_csum_loop: |
| GETD D1Ar3,[D1Ar1++] |
| ADDS D0Re0,D0Re0,D1Ar3 |
| ADDCS D0Re0,D0Re0,#1 |
| BR $Lfast_csum_loop |
| LSR D0Ar4,D0Re0,#16 |
| AND D0Re0,D0Re0,#0xffff |
| AND D0Ar4,D0Ar4,#0xffff |
| ADD D0Re0,D0Re0,D0Ar4 |
| LSR D0Ar4,D0Re0,#16 |
| ADD D0Re0,D0Re0,D0Ar4 |
| XOR D0Re0,D0Re0,#-1 |
| AND D0Re0,D0Re0,#0xffff |
| $Lfast_csum_exit: |
| MOV PC,D1RtP |
| .size _ip_fast_csum,.-_ip_fast_csum |
