/*
   * 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