/* Copyright © 1994-1999 Lucent Technologies Inc.  All rights reserved.
 * Portions Copyright © 1997-1999 Vita Nuova Limited
 * Portions Copyright © 2000-2007 Vita Nuova Holdings Limited
 *                                (www.vitanuova.com)
 * Revisions Copyright © 2000-2007 Lucent Technologies Inc. and others
 *
 * Modified for the Akaros operating system:
 * Copyright (c) 2013-2014 The Regents of the University of California
 * Copyright (c) 2013-2015 Google Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE. */

#include <vfs.h>
#include <kfs.h>
#include <slab.h>
#include <kmalloc.h>
#include <kref.h>
#include <string.h>
#include <stdio.h>
#include <assert.h>
#include <error.h>
#include <cpio.h>
#include <pmap.h>
#include <smp.h>
#include <net/ip.h>
#include <endian.h>

static short endian = 1;
static uint8_t *aendian = (uint8_t *) & endian;
#define	LITTLE	*aendian


#ifdef CONFIG_X86

/* $NetBSD: in_cksum.c,v 1.7 1997/09/02 13:18:15 thorpej Exp $ */

/*-
 * Copyright (c) 1988, 1992, 1993
 *	The Regents of the University of California.  All rights reserved.
 * Copyright (c) 1996
 *	Matt Thomas <matt@3am-software.com>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)in_cksum.c	8.1 (Berkeley) 6/10/93
 */

/*
 * Checksum routine for Internet Protocol family headers
 *    (Portable Alpha version).
 *
 * This routine is very heavily used in the network
 * code and should be modified for each CPU to be as fast as possible.
 */

#define ADDCARRY(x)  (x > 65535 ? x -= 65535 : x)
#define REDUCE32							  \
    {									  \
	q_util.q = sum;							  \
	sum = q_util.s[0] + q_util.s[1] + q_util.s[2] + q_util.s[3];	  \
    }
#define REDUCE16							  \
    {									  \
	q_util.q = sum;							  \
	l_util.l = q_util.s[0] + q_util.s[1] + q_util.s[2] + q_util.s[3]; \
	sum = l_util.s[0] + l_util.s[1];				  \
	ADDCARRY(sum);							  \
    }

static const uint32_t in_masks[] = {
	/*0 bytes*/ /*1 byte*/	/*2 bytes*/ /*3 bytes*/
	0x00000000, 0x000000FF, 0x0000FFFF, 0x00FFFFFF,	/* offset 0 */
	0x00000000, 0x0000FF00, 0x00FFFF00, 0xFFFFFF00,	/* offset 1 */
	0x00000000, 0x00FF0000, 0xFFFF0000, 0xFFFF0000,	/* offset 2 */
	0x00000000, 0xFF000000, 0xFF000000, 0xFF000000,	/* offset 3 */
};

union l_util {
	uint16_t s[2];
	uint32_t l;
};
union q_util {
	uint16_t s[4];
	uint32_t l[2];
	uint64_t q;
};

static uint64_t
in_cksumdata(const void *buf, int len)
{
	const uint32_t *lw = (const uint32_t *) buf;
	uint64_t sum = 0;
	uint64_t prefilled;
	int offset;
	union q_util q_util;

	if ((3 & (long) lw) == 0 && len == 20) {
	     sum = (uint64_t) lw[0] + lw[1] + lw[2] + lw[3] + lw[4];
	     REDUCE32;
	     return sum;
	}

	if ((offset = 3 & (long) lw) != 0) {
		const uint32_t *masks = in_masks + (offset << 2);
		lw = (uint32_t *) (((long) lw) - offset);
		sum = *lw++ & masks[len >= 3 ? 3 : len];
		len -= 4 - offset;
		if (len <= 0) {
			REDUCE32;
			return sum;
		}
	}
#if 0
	/*
	 * Force to cache line boundary.
	 */
	offset = 32 - (0x1f & (long) lw);
	if (offset < 32 && len > offset) {
		len -= offset;
		if (4 & offset) {
			sum += (uint64_t) lw[0];
			lw += 1;
		}
		if (8 & offset) {
			sum += (uint64_t) lw[0] + lw[1];
			lw += 2;
		}
		if (16 & offset) {
			sum += (uint64_t) lw[0] + lw[1] + lw[2] + lw[3];
			lw += 4;
		}
	}
#endif
	/*
	 * access prefilling to start load of next cache line.
	 * then add current cache line
	 * save result of prefilling for loop iteration.
	 */
	prefilled = lw[0];
	while ((len -= 32) >= 4) {
		uint64_t prefilling = lw[8];
		sum += prefilled + lw[1] + lw[2] + lw[3]
			+ lw[4] + lw[5] + lw[6] + lw[7];
		lw += 8;
		prefilled = prefilling;
	}
	if (len >= 0) {
		sum += prefilled + lw[1] + lw[2] + lw[3]
			+ lw[4] + lw[5] + lw[6] + lw[7];
		lw += 8;
	} else {
		len += 32;
	}
	while ((len -= 16) >= 0) {
		sum += (uint64_t) lw[0] + lw[1] + lw[2] + lw[3];
		lw += 4;
	}
	len += 16;
	while ((len -= 4) >= 0) {
		sum += (uint64_t) *lw++;
	}
	len += 4;
	if (len > 0)
		sum += (uint64_t) (in_masks[len] & *lw);
	REDUCE32;
	return sum;
}
uint16_t ptclbsum(uint8_t * addr, int len)
{
	uint64_t sum = in_cksumdata(addr, len);
	union q_util q_util;
	union l_util l_util;
	if ((uintptr_t)addr & 1)
		sum <<= 8;
	REDUCE16;
	return cpu_to_be16(sum);
}
#else
uint16_t ptclbsum(uint8_t * addr, int len)
{
	uint32_t losum, hisum, mdsum, x;
	uint32_t t1, t2;

	losum = 0;
	hisum = 0;
	mdsum = 0;

	x = 0;
	if ((uintptr_t) addr & 1) {
		if (len) {
			hisum += addr[0];
			len--;
			addr++;
		}
		x = 1;
	}
	while (len >= 16) {
		t1 = *(uint16_t *) (addr + 0);
		t2 = *(uint16_t *) (addr + 2);
		mdsum += t1;
		t1 = *(uint16_t *) (addr + 4);
		mdsum += t2;
		t2 = *(uint16_t *) (addr + 6);
		mdsum += t1;
		t1 = *(uint16_t *) (addr + 8);
		mdsum += t2;
		t2 = *(uint16_t *) (addr + 10);
		mdsum += t1;
		t1 = *(uint16_t *) (addr + 12);
		mdsum += t2;
		t2 = *(uint16_t *) (addr + 14);
		mdsum += t1;
		mdsum += t2;
		len -= 16;
		addr += 16;
	}
	while (len >= 2) {
		mdsum += *(uint16_t *) addr;
		len -= 2;
		addr += 2;
	}
	if (x) {
		if (len)
			losum += addr[0];
		if (LITTLE)
			losum += mdsum;
		else
			hisum += mdsum;
	} else {
		if (len)
			hisum += addr[0];
		if (LITTLE)
			hisum += mdsum;
		else
			losum += mdsum;
	}

	losum += hisum >> 8;
	losum += (hisum & 0xff) << 8;
	while ((hisum = losum >> 16))
		losum = hisum + (losum & 0xffff);

	return losum & 0xffff;
}
#endif