FM / asm

/usr/src/linux-headers-5.15.0-190/arch/arc/include/asm/

/usr/src/linux-headers-5.15.0-190/arch/arc/include/asm

Name	Size	Mode	Actions
arcregs.h	9477	0644	edit dl rm
asm-offsets.h	165	0644	edit dl rm
asserts.h	958	0644	edit dl rm
atomic-llsc.h	2864	0644	edit dl rm
atomic-spinlock.h	2569	0644	edit dl rm
atomic.h	1153	0644	edit dl rm
atomic64-arcv2.h	6095	0644	edit dl rm
barrier.h	1376	0644	edit dl rm
bitops.h	3885	0644	edit dl rm
bug.h	819	0644	edit dl rm
cache.h	3604	0644	edit dl rm
cacheflush.h	3824	0644	edit dl rm
checksum.h	2371	0644	edit dl rm
cmpxchg.h	3188	0644	edit dl rm
current.h	549	0644	edit dl rm
delay.h	1896	0644	edit dl rm
disasm.h	3813	0644	edit dl rm
dma.h	313	0644	edit dl rm
dsp-impl.h	3860	0644	edit dl rm
dsp.h	796	0644	edit dl rm
dwarf.h	746	0644	edit dl rm
elf.h	1935	0644	edit dl rm
entry-arcv2.h	7419	0644	edit dl rm
entry-compact.h	8810	0644	edit dl rm
entry.h	6687	0644	edit dl rm
exec.h	264	0644	edit dl rm
fb.h	411	0644	edit dl rm
fpu.h	1125	0644	edit dl rm
futex.h	3611	0644	edit dl rm
highmem.h	1422	0644	edit dl rm
hugepage.h	2071	0644	edit dl rm
io.h	6291	0644	edit dl rm
irq.h	679	0644	edit dl rm
irqflags-arcv2.h	3491	0644	edit dl rm
irqflags-compact.h	4293	0644	edit dl rm
irqflags.h	363	0644	edit dl rm
jump_label.h	1976	0644	edit dl rm
Kbuild	153	0644	edit dl rm
kdebug.h	254	0644	edit dl rm
kgdb.h	1239	0644	edit dl rm
kprobes.h	1186	0644	edit dl rm
linkage.h	1484	0644	edit dl rm
mach_desc.h	1943	0644	edit dl rm
mmu-arcv2.h	2494	0644	edit dl rm
mmu.h	387	0644	edit dl rm
mmu_context.h	5568	0644	edit dl rm
module.h	428	0644	edit dl rm
page.h	3313	0644	edit dl rm
pci.h	360	0644	edit dl rm
perf_event.h	6879	0644	edit dl rm
pgalloc.h	2888	0644	edit dl rm
pgtable-bits-arcv2.h	4896	0644	edit dl rm
pgtable-levels.h	5626	0644	edit dl rm
pgtable.h	780	0644	edit dl rm
processor.h	3253	0644	edit dl rm
ptrace.h	3759	0644	edit dl rm
sections.h	261	0644	edit dl rm
segment.h	476	0644	edit dl rm
serial.h	498	0644	edit dl rm
setup.h	1274	0644	edit dl rm
shmparam.h	296	0644	edit dl rm
smp.h	3823	0644	edit dl rm
spinlock.h	8580	0644	edit dl rm
spinlock_types.h	905	0644	edit dl rm
stacktrace.h	1178	0644	edit dl rm
string.h	1036	0644	edit dl rm
switch_to.h	553	0644	edit dl rm
syscall.h	1738	0644	edit dl rm
syscalls.h	547	0644	edit dl rm
thread_info.h	3339	0644	edit dl rm
timex.h	362	0644	edit dl rm
tlb.h	262	0644	edit dl rm
tlbflush.h	1654	0644	edit dl rm
uaccess.h	17019	0644	edit dl rm
unaligned.h	625	0644	edit dl rm
unwind.h	3446	0644	edit dl rm
vermagic.h	157	0644	edit dl rm
vmalloc.h	87	0644	edit dl rm

Edit: /usr/src/linux-headers-5.15.0-190/arch/arc/include/asm/checksum.h (2371B)

/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
 *
 * 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 int 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 */

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