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/* checksum.h: FRV checksumming
 *
 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 *
 * 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.
 */

#ifndef _ASM_CHECKSUM_H
#define _ASM_CHECKSUM_H

#include <linux/in6.h>

/*
 * computes the checksum of a memory block at buff, length len,
 * and adds in "sum" (32-bit)
 *
 * returns a 32-bit number suitable for feeding into itself
 * or csum_tcpudp_magic
 *
 * this function must be called with even lengths, except
 * for the last fragment, which may be odd
 *
 * it's best to have buff aligned on a 32-bit boundary
 */
__wsum csum_partial(const void *buff, int len, __wsum sum);

/*
 * the same as csum_partial, but copies from src while it
 * checksums
 *
 * here even more important to align src and dst on a 32-bit (or even
 * better 64-bit) boundary
 */
__wsum csum_partial_copy_nocheck(const void *src, void *dst, int len, __wsum sum);

/*
 * the same as csum_partial_copy, but copies from user space.
 *
 * here even more important to align src and dst on a 32-bit (or even
 * better 64-bit) boundary
 */
extern __wsum csum_partial_copy_from_user(const void __user *src, void *dst,
						int len, __wsum sum, int *csum_err);

/*
 *	This is a version of ip_compute_csum() optimized for IP headers,
 *	which always checksum on 4 octet boundaries.
 *
 */
static inline
__sum16 ip_fast_csum(const void *iph, unsigned int ihl)
{
	unsigned int tmp, inc, sum = 0;

	asm("	addcc		gr0,gr0,gr0,icc0\n" /* clear icc0.C */
	    "	subi		%1,#4,%1	\n"
	    "0:					\n"
	    "	ldu.p		@(%1,%3),%4	\n"
	    "	subicc		%2,#1,%2,icc1	\n"
	    "	addxcc.p	%4,%0,%0,icc0	\n"
	    "	bhi		icc1,#2,0b	\n"

	    /* fold the 33-bit result into 16-bits */
	    "	addxcc		gr0,%0,%0,icc0	\n"
	    "	srli		%0,#16,%1	\n"
	    "	sethi		#0,%0		\n"
	    "	add		%1,%0,%0	\n"
	    "	srli		%0,#16,%1	\n"
	    "	add		%1,%0,%0	\n"

	    : "=r" (sum), "=r" (iph), "=r" (ihl), "=r" (inc), "=&r"(tmp)
	    : "0" (sum), "1" (iph), "2" (ihl), "3" (4),
	    "m"(*(volatile struct { int _[100]; } *)iph)
	    : "icc0", "icc1", "memory"
	    );

	return (__force __sum16)~sum;
}

/*
 *	Fold a partial checksum
 */
static inline __sum16 csum_fold(__wsum sum)
{
	unsigned int tmp;

	asm("	srli		%0,#16,%1	\n"
	    "	sethi		#0,%0		\n"
	    "	add		%1,%0,%0	\n"
	    "	srli		%0,#16,%1	\n"
	    "	add		%1,%0,%0	\n"
	    : "=r"(sum), "=&r"(tmp)
	    : "0"(sum)
	    );

	return (__force __sum16)~sum;
}

/*
 * computes the checksum of the TCP/UDP pseudo-header
 * returns a 16-bit checksum, already complemented
 */
static inline __wsum
csum_tcpudp_nofold(__be32 saddr, __be32 daddr, __u32 len,
		   __u8 proto, __wsum sum)
{
	asm("	addcc		%1,%0,%0,icc0	\n"
	    "	addxcc		%2,%0,%0,icc0	\n"
	    "	addxcc		%3,%0,%0,icc0	\n"
	    "	addxcc		gr0,%0,%0,icc0	\n"
	    : "=r" (sum)
	    : "r" (daddr), "r" (saddr), "r" (len + proto), "0"(sum)
	    : "icc0"
	    );
	return sum;
}

static inline __sum16
csum_tcpudp_magic(__be32 saddr, __be32 daddr, __u32 len,
		  __u8 proto, __wsum sum)
{
	return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum));
}

/*
 * this routine is used for miscellaneous IP-like checksums, mainly
 * in icmp.c
 */
extern __sum16 ip_compute_csum(const void *buff, int len);

#define _HAVE_ARCH_IPV6_CSUM
static inline __sum16
csum_ipv6_magic(const struct in6_addr *saddr, const struct in6_addr *daddr,
		__u32 len, __u8 proto, __wsum sum)
{
	unsigned long tmp, tmp2;

	asm("	addcc		%2,%0,%0,icc0	\n"

	    /* add up the source addr */
	    "	ldi		@(%3,0),%1	\n"
	    "	addxcc		%1,%0,%0,icc0	\n"
	    "	ldi		@(%3,4),%2	\n"
	    "	addxcc		%2,%0,%0,icc0	\n"
	    "	ldi		@(%3,8),%1	\n"
	    "	addxcc		%1,%0,%0,icc0	\n"
	    "	ldi		@(%3,12),%2	\n"
	    "	addxcc		%2,%0,%0,icc0	\n"

	    /* add up the dest addr */
	    "	ldi		@(%4,0),%1	\n"
	    "	addxcc		%1,%0,%0,icc0	\n"
	    "	ldi		@(%4,4),%2	\n"
	    "	addxcc		%2,%0,%0,icc0	\n"
	    "	ldi		@(%4,8),%1	\n"
	    "	addxcc		%1,%0,%0,icc0	\n"
	    "	ldi		@(%4,12),%2	\n"
	    "	addxcc		%2,%0,%0,icc0	\n"

	    /* fold the 33-bit result into 16-bits */
	    "	addxcc		gr0,%0,%0,icc0	\n"
	    "	srli		%0,#16,%1	\n"
	    "	sethi		#0,%0		\n"
	    "	add		%1,%0,%0	\n"
	    "	srli		%0,#16,%1	\n"
	    "	add		%1,%0,%0	\n"

	    : "=r" (sum), "=&r" (tmp), "=r" (tmp2)
	    : "r" (saddr), "r" (daddr), "0" (sum), "2" (len + proto)
	    : "icc0"
	    );

	return (__force __sum16)~sum;
}

#endif /* _ASM_CHECKSUM_H */

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Name Type Size Permission Actions
Kbuild File 290 B 0644
asm-offsets.h File 35 B 0644
atomic.h File 4.97 KB 0644
atomic_defs.h File 4.66 KB 0644
ax88796.h File 751 B 0644
barrier.h File 720 B 0644
bitops.h File 7.12 KB 0644
bug.h File 1.36 KB 0644
bugs.h File 445 B 0644
busctl-regs.h File 2.02 KB 0644
cache.h File 727 B 0644
cacheflush.h File 3.05 KB 0644
checksum.h File 4.53 KB 0644
cmpxchg.h File 4.56 KB 0644
cpu-irqs.h File 2.59 KB 0644
current.h File 685 B 0644
delay.h File 1.28 KB 0644
div64.h File 31 B 0644
dm9000.h File 1.12 KB 0644
dma-mapping.h File 448 B 0644
dma.h File 3.63 KB 0644
elf.h File 5.18 KB 0644
emergency-restart.h File 149 B 0644
fpu.h File 261 B 0644
ftrace.h File 12 B 0644
futex.h File 416 B 0644
gdb-stub.h File 4.47 KB 0644
gpio-regs.h File 3.64 KB 0644
hardirq.h File 666 B 0644
highmem.h File 4.09 KB 0644
hw_irq.h File 484 B 0644
io.h File 9.75 KB 0644
irc-regs.h File 1.78 KB 0644
irq.h File 760 B 0644
irq_regs.h File 764 B 0644
irqflags.h File 3.71 KB 0644
kdebug.h File 32 B 0644
kmap_types.h File 123 B 0644
linkage.h File 114 B 0644
local.h File 140 B 0644
local64.h File 33 B 0644
math-emu.h File 6.38 KB 0644
mb-regs.h File 6.94 KB 0644
mb86943a.h File 1.84 KB 0644
mb93091-fpga-irqs.h File 1.06 KB 0644
mb93093-fpga-irqs.h File 789 B 0644
mb93493-irqs.h File 1.69 KB 0644
mb93493-regs.h File 12.46 KB 0644
mem-layout.h File 2.21 KB 0644
mmu.h File 1.26 KB 0644
mmu_context.h File 1.38 KB 0644
module.h File 617 B 0644
page.h File 2.08 KB 0644
pci.h File 1.23 KB 0644
percpu.h File 147 B 0644
perf_event.h File 487 B 0644
pgalloc.h File 1.87 KB 0644
pgtable.h File 16.02 KB 0644
processor.h File 2.85 KB 0644
ptrace.h File 1.2 KB 0644
sections.h File 1.1 KB 0644
segment.h File 1.08 KB 0644
serial-regs.h File 1.63 KB 0644
serial.h File 308 B 0644
setup.h File 641 B 0644
shmparam.h File 183 B 0644
signal.h File 141 B 0644
smp.h File 139 B 0644
spinlock.h File 516 B 0644
spr-regs.h File 17.93 KB 0644
string.h File 1.36 KB 0644
switch_to.h File 1.07 KB 0644
syscall.h File 2.73 KB 0644
termios.h File 425 B 0644
thread_info.h File 3.48 KB 0644
timer-regs.h File 3.63 KB 0644
timex.h File 720 B 0644
tlb.h File 615 B 0644
tlbflush.h File 1.88 KB 0644
topology.h File 229 B 0644
types.h File 595 B 0644
uaccess.h File 6.79 KB 0644
ucontext.h File 281 B 0644
unaligned.h File 694 B 0644
unistd.h File 928 B 0644
user.h File 3.29 KB 0644
vga.h File 464 B 0644
virtconvert.h File 1.09 KB 0644
xor.h File 29 B 0644