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/*-
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* 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.
*
* from tahoe: in_cksum.c 1.2 86/01/05
* from: @(#)in_cksum.c 1.3 (Berkeley) 1/19/91
* from: Id: in_cksum.c,v 1.8 1995/12/03 18:35:19 bde Exp
* $FreeBSD$
*/
#ifndef _MACHINE_IN_CKSUM_H_
#define _MACHINE_IN_CKSUM_H_ 1
#include <sys/cdefs.h>
#ifdef _KERNEL
u_short in_cksum(struct mbuf *m, int len);
u_short in_addword(u_short sum, u_short b);
u_short in_cksum_skip(struct mbuf *m, int len, int skip);
u_int do_cksum(const void *, int);
static __inline u_int
in_cksum_hdr(const struct ip *ip)
{
u_int sum = 0;
u_int tmp1, tmp2, tmp3, tmp4;
if (((vm_offset_t)ip & 0x03) == 0)
__asm __volatile (
"adds %0, %0, %1\n"
"adcs %0, %0, %2\n"
"adcs %0, %0, %3\n"
"adcs %0, %0, %4\n"
"adcs %0, %0, %5\n"
"adc %0, %0, #0\n"
: "+r" (sum)
: "r" (((const u_int32_t *)ip)[0]),
"r" (((const u_int32_t *)ip)[1]),
"r" (((const u_int32_t *)ip)[2]),
"r" (((const u_int32_t *)ip)[3]),
"r" (((const u_int32_t *)ip)[4])
);
else
__asm __volatile (
"and %1, %5, #3\n"
"cmp %1, #0x02\n"
"ldrb %2, [%5], #0x01\n"
"ldrgeb %3, [%5], #0x01\n"
"movlt %3, #0\n"
"ldrgtb %4, [%5], #0x01\n"
"movle %4, #0x00\n"
#ifdef __ARMEB__
"orreq %0, %3, %2, lsl #8\n"
"orreq %0, %0, %4, lsl #24\n"
"orrne %0, %0, %3, lsl #8\n"
"orrne %0, %0, %4, lsl #16\n"
#else
"orreq %0, %2, %3, lsl #8\n"
"orreq %0, %0, %4, lsl #16\n"
"orrne %0, %3, %2, lsl #8\n"
"orrne %0, %0, %4, lsl #24\n"
#endif
"ldmia %5, {%2, %3, %4}\n"
"adcs %0, %0, %2\n"
"adcs %0, %0, %3\n"
"adcs %0, %0, %4\n"
"ldrb %2, [%5]\n"
"cmp %1, #0x02\n"
"ldrgeb %3, [%5, #0x01]\n"
"movlt %3, #0x00\n"
"ldrgtb %4, [%5, #0x02]\n"
"movle %4, #0x00\n"
"tst %5, #0x01\n"
#ifdef __ARMEB__
"orreq %2, %3, %2, lsl #8\n"
"orreq %2, %2, %4, lsl #24\n"
"orrne %2, %2, %3, lsl #8\n"
"orrne %2, %2, %4, lsl #16\n"
#else
"orreq %2, %2, %3, lsl #8\n"
"orreq %2, %2, %4, lsl #16\n"
"orrne %2, %3, %2, lsl #8\n"
"orrne %2, %2, %4, lsl #24\n"
#endif
"adds %0, %0, %2\n"
"adc %0, %0, #0\n"
: "+r" (sum), "=r" (tmp1), "=r" (tmp2), "=r" (tmp3),
"=r" (tmp4)
: "r" (ip));
sum = (sum & 0xffff) + (sum >> 16);
if (sum > 0xffff)
sum -= 0xffff;
return (~sum & 0xffff);
}
static __inline u_short
in_pseudo(u_int sum, u_int b, u_int c)
{
__asm __volatile("adds %0, %0, %1\n"
"adcs %0, %0, %2\n"
"adc %0, %0, #0\n"
: "+r" (sum)
: "r" (b), "r" (c));
sum = (sum & 0xffff) + (sum >> 16);
if (sum > 0xffff)
sum -= 0xffff;
return (sum);
}
#endif /* _KERNEL */
#endif /* _MACHINE_IN_CKSUM_H_ */
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