| /* |
| * Copyright (C) 2004-2006 Atmel Corporation |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| |
| /* |
| * unsigned int csum_partial(const unsigned char *buff, |
| * int len, unsigned int sum) |
| */ |
| .text |
| .global csum_partial |
| .type csum_partial,"function" |
| .align 1 |
| csum_partial: |
| /* checksum complete words, aligned or not */ |
| 3: sub r11, 4 |
| brlt 5f |
| 4: ld.w r9, r12++ |
| add r10, r9 |
| acr r10 |
| sub r11, 4 |
| brge 4b |
| |
| /* return if we had a whole number of words */ |
| 5: sub r11, -4 |
| reteq r10 |
| |
| /* checksum any remaining bytes at the end */ |
| mov r9, 0 |
| mov r8, 0 |
| cp r11, 2 |
| brlt 6f |
| ld.uh r9, r12++ |
| sub r11, 2 |
| breq 7f |
| lsl r9, 16 |
| 6: ld.ub r8, r12++ |
| lsl r8, 8 |
| 7: or r9, r8 |
| add r10, r9 |
| acr r10 |
| |
| retal r10 |
| .size csum_partial, . - csum_partial |
