| /* | |
| * 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 |