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- /*
- * 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
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