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generated by cgit v1.2.2 (git 2.25.0) at 2025-09-21 04:48:11 -0400
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/*
 * INET		An implementation of the TCP/IP protocol suite for the LINUX
 *		operating system.  INET is implemented using the  BSD Socket
 *		interface as the means of communication with the user level.
 *
 *		IP/TCP/UDP checksumming routines
 *
 * Xtensa version:  Copyright (C) 2001 Tensilica, Inc. by Kevin Chea
 *                  Optimized by Joe Taylor
 *
 *		This program is free software; you can redistribute it and/or
 *		modify it under the terms of the GNU General Public License
 *		as published by the Free Software Foundation; either version
 *		2 of the License, or (at your option) any later version.
 */

#include <asm/errno.h>
#include <linux/linkage.h>
#include <variant/core.h>

/*
 * computes a partial checksum, e.g. for TCP/UDP fragments
 */

/*
 * unsigned int csum_partial(const unsigned char *buf, int len,
 *                           unsigned int sum);
 *    a2 = buf
 *    a3 = len
 *    a4 = sum
 *
 * This function assumes 2- or 4-byte alignment.  Other alignments will fail!
 */

/* ONES_ADD converts twos-complement math to ones-complement. */
#define ONES_ADD(sum, val)	  \
	add	sum, sum, val	; \
	bgeu	sum, val, 99f	; \
	addi	sum, sum, 1	; \
99:				;

.text
ENTRY(csum_partial)
	  /*
	   * Experiments with Ethernet and SLIP connections show that buf
	   * is aligned on either a 2-byte or 4-byte boundary.
	   */
	entry	sp, 32
	extui	a5, a2, 0, 2
	bnez	a5, 8f		/* branch if 2-byte aligned */
	/* Fall-through on common case, 4-byte alignment */
1:
	srli	a5, a3, 5	/* 32-byte chunks */
#if XCHAL_HAVE_LOOPS
	loopgtz	a5, 2f
#else
	beqz	a5, 2f
	slli	a5, a5, 5
	add	a5, a5, a2	/* a5 = end of last 32-byte chunk */
.Loop1:
#endif
	l32i	a6, a2, 0
	l32i	a7, a2, 4
	ONES_ADD(a4, a6)
	ONES_ADD(a4, a7)
	l32i	a6, a2, 8
	l32i	a7, a2, 12
	ONES_ADD(a4, a6)
	ONES_ADD(a4, a7)
	l32i	a6, a2, 16
	l32i	a7, a2, 20
	ONES_ADD(a4, a6)
	ONES_ADD(a4, a7)
	l32i	a6, a2, 24
	l32i	a7, a2, 28
	ONES_ADD(a4, a6)
	ONES_ADD(a4, a7)
	addi	a2, a2, 4*8
#if !XCHAL_HAVE_LOOPS
	blt	a2, a5, .Loop1
#endif
2:
	extui	a5, a3, 2, 3	/* remaining 4-byte chunks */
#if XCHAL_HAVE_LOOPS
	loopgtz	a5, 3f
#else
	beqz	a5, 3f
	slli	a5, a5, 2
	add	a5, a5, a2	/* a5 = end of last 4-byte chunk */
.Loop2:
#endif
	l32i	a6, a2, 0
	ONES_ADD(a4, a6)
	addi	a2, a2, 4
#if !XCHAL_HAVE_LOOPS
	blt	a2, a5, .Loop2
#endif
3:
	_bbci.l	a3, 1, 5f	/* remaining 2-byte chunk */
	l16ui	a6, a2, 0
	ONES_ADD(a4, a6)
	addi	a2, a2, 2
5:
	_bbci.l	a3, 0, 7f	/* remaining 1-byte chunk */
6:	l8ui	a6, a2, 0
#ifdef __XTENSA_EB__
	slli	a6, a6, 8	/* load byte into bits 8..15 */
#endif
	ONES_ADD(a4, a6)
7:
	mov	a2, a4
	retw

	/* uncommon case, buf is 2-byte aligned */
8: