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/*
 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Joern Rennecke  <joern.rennecke@embecosm.com>: Jan 2012
 *  -Insn Scheduling improvements to csum core routines.
 *      = csum_fold( ) largely derived from ARM version.
 *      = ip_fast_cum( ) to have module scheduling
 *  -gcc 4.4.x broke networking. Alias analysis needed to be primed.
 *   worked around by adding memory clobber to ip_fast_csum( )
 *
 * vineetg: May 2010
 *  -Rewrote ip_fast_cscum( ) and csum_fold( ) with fast inline asm
 */

#ifndef _ASM_ARC_CHECKSUM_H
#define _ASM_ARC_CHECKSUM_H

/*
 *	Fold a partial checksum
 *
 *  The 2 swords comprising the 32bit sum are added, any carry to 16th bit
 *  added back and final sword result inverted.
 */
static inline __sum16 csum_fold(__wsum s)
{
	unsigned r = s << 16 | s >> 16;	/* ror */
	s = ~s;
	s -= r;
	return s >> 16;
}

/*
 *	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)
{
	const void *ptr = iph;
	unsigned int tmp, tmp2, sum;

	__asm__(
	"	ld.ab  %0, [%3, 4]		\n"
	"	ld.ab  %2, [%3, 4]		\n"
	"	sub    %1, %4, 2		\n"
	"	lsr.f  lp_count, %1, 1		\n"
	"	bcc    0f			\n"
	"	add.f  %0, %0, %2		\n"
	"	ld.ab  %2, [%3, 4]		\n"
	"0:	lp     1f			\n"
	"	ld.ab  %1, [%3, 4]		\n"
	"	adc.f  %0, %0, %2		\n"
	"	ld.ab  %2, [%3, 4]		\n"
	"	adc.f  %0, %0, %1		\n"
	"1:	adc.f  %0, %0, %2		\n"
	"	add.cs %0,%0,1			\n"
	: "=&r"(sum), "=r"(tmp), "=&r"(tmp2), "+&r" (ptr)
	: "r"(ihl)
	: "cc", "lp_count", "memory");

	return csum_fold(sum);
}

/*
 * TCP pseudo Header is 12 bytes:
 * SA [4], DA [4], zeroes [1], Proto[1], TCP Seg(hdr+data) Len [2]
 */
static inline __wsum
csum_tcpudp_nofold(__be32 saddr, __be32 daddr, __u32 len,
		   __u8 proto, __wsum sum)
{
	__asm__ __volatile__(
	"	add.f %0, %0, %1	\n"
	"	adc.f %0, %0, %2	\n"
	"	adc.f %0, %0, %3	\n"
	"	adc.f %0, %0, %4	\n"
	"	adc   %0, %0, 0		\n"
	: "+&r"(sum)
	: "r"(saddr), "r"(daddr),
#ifdef CONFIG_CPU_BIG_ENDIAN
	  "r"(len),
#else
	  "r"(len << 8),
#endif
	  "r"(htons(proto))
	: "cc");

	return sum;
}

#define csum_fold csum_fold
#define ip_fast_csum ip_fast_csum
#define csum_tcpudp_nofold csum_tcpudp_nofold

#include <asm-generic/checksum.h>

#endif /* _ASM_ARC_CHECKSUM_H */

Filemanager

Name Type Size Permission Actions
Kbuild File 681 B 0644
arcregs.h File 8.59 KB 0644
asm-offsets.h File 311 B 0644
atomic.h File 15.14 KB 0644
barrier.h File 1.75 KB 0644
bitops.h File 9.81 KB 0644
bug.h File 938 B 0644
cache.h File 3.77 KB 0644
cacheflush.h File 3.88 KB 0644
checksum.h File 2.45 KB 0644
cmpxchg.h File 5.4 KB 0644
current.h File 695 B 0644
delay.h File 1.99 KB 0644
disasm.h File 3.87 KB 0644
dma-mapping.h File 734 B 0644
dma.h File 459 B 0644
dwarf.h File 892 B 0644
elf.h File 2.15 KB 0644
entry-arcv2.h File 4.85 KB 0644
entry-compact.h File 9.29 KB 0644
entry.h File 6.73 KB 0644
exec.h File 410 B 0644
fb.h File 411 B 0644
futex.h File 3.67 KB 0644
highmem.h File 1.46 KB 0644
hugepage.h File 2.41 KB 0644
io.h File 6.43 KB 0644
irq.h File 825 B 0644
irqflags-arcv2.h File 3.45 KB 0644
irqflags-compact.h File 4.25 KB 0644
irqflags.h File 509 B 0644
kdebug.h File 400 B 0644
kgdb.h File 1.35 KB 0644
kmap_types.h File 489 B 0644
kprobes.h File 1.37 KB 0644
linkage.h File 1.42 KB 0644
mach_desc.h File 2.06 KB 0644
mmu.h File 2.44 KB 0644
mmu_context.h File 5.67 KB 0644
mmzone.h File 989 B 0644
module.h File 661 B 0644
page.h File 2.99 KB 0644
pci.h File 705 B 0644
perf_event.h File 6.86 KB 0644
pgalloc.h File 3.79 KB 0644
pgtable.h File 14.2 KB 0644
processor.h File 4.69 KB 0644
ptrace.h File 3.87 KB 0644
sections.h File 407 B 0644
segment.h File 612 B 0644
serial.h File 644 B 0644
setup.h File 1.18 KB 0644
shmparam.h File 442 B 0644
smp.h File 4.25 KB 0644
spinlock.h File 8.79 KB 0644
spinlock_types.h File 1.03 KB 0644
stacktrace.h File 1.29 KB 0644
string.h File 1.15 KB 0644
switch_to.h File 1.17 KB 0644
syscall.h File 1.57 KB 0644
syscalls.h File 653 B 0644
thread_info.h File 3.39 KB 0644
timex.h File 508 B 0644
tlb-mmu1.h File 3.48 KB 0644
tlb.h File 1.23 KB 0644
tlbflush.h File 1.76 KB 0644
uaccess.h File 18.45 KB 0644
unaligned.h File 771 B 0644
unwind.h File 3.51 KB 0644