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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/avr32/lib/csum_partial.S
10817 views
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/*

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 * Copyright (C) 2004-2006 Atmel Corporation

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 *

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 * This program is free software; you can redistribute it and/or modify

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 * it under the terms of the GNU General Public License version 2 as

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 * published by the Free Software Foundation.

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 */

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	/*

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	 * unsigned int csum_partial(const unsigned char *buff,

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	 *			     int len, unsigned int sum)

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	 */

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	.text

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	.global	csum_partial

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	.type	csum_partial,"function"

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	.align	1

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csum_partial:

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	/* checksum complete words, aligned or not */

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3:	sub	r11, 4

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	brlt	5f

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4:	ld.w	r9, r12++

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	add	r10, r9

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	acr	r10

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	sub	r11, 4

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	brge	4b

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	/* return if we had a whole number of words */

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5:	sub	r11, -4

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	reteq	r10

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	/* checksum any remaining bytes at the end */

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	mov	r9, 0

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	mov	r8, 0

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	cp	r11, 2

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	brlt	6f

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	ld.uh	r9, r12++

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	sub	r11, 2

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	breq	7f

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	lsl	r9, 16

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6:	ld.ub	r8, r12++

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	lsl	r8, 8

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7:	or	r9, r8

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	add	r10, r9

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	acr	r10

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	retal	r10

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	.size	csum_partial, . - csum_partial

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