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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_CRIS_ARCH_CHECKSUM_H
#define _ASM_CRIS_ARCH_CHECKSUM_H

/*
 * Check values used in TCP/UDP headers.
 *
 * The gain of doing this in assembler instead of C, is that C doesn't
 * generate carry-additions for the 32-bit components of the
 * checksum. Which means it would be necessary to split all those into
 * 16-bit components and then add.
 */
static inline __wsum
csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
		   __u32 len, __u8 proto, __wsum sum)
{
	__wsum res;

	__asm__ __volatile__ ("add.d %2, %0\n\t"
			      "addc %3, %0\n\t"
			      "addc %4, %0\n\t"
			      "addc 0, %0\n\t"
			      : "=r" (res)
			      : "0" (sum), "r" (daddr), "r" (saddr), \
			      "r" ((len + proto) << 8));

	return res;
}

#endif /* _ASM_CRIS_ARCH_CHECKSUM_H */

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Name Type Size Permission Actions
hwregs Folder 0755
bitops.h File 1.29 KB 0644
bug.h File 1008 B 0644
cache.h File 601 B 0644
checksum.h File 807 B 0644
cryptocop.h File 4.25 KB 0644
delay.h File 649 B 0644
dma.h File 22 B 0644
intmem.h File 339 B 0644
irq.h File 3.55 KB 0644
irqflags.h File 1 KB 0644
memmap.h File 25 B 0644
mmu.h File 4.07 KB 0644
offset.h File 1.29 KB 0644
page.h File 660 B 0644
pgtable.h File 483 B 0644
processor.h File 1.52 KB 0644
swab.h File 517 B 0644
system.h File 803 B 0644
thread_info.h File 363 B 0644
timex.h File 852 B 0644
tlb.h File 453 B 0644
uaccess.h File 18.38 KB 0644
unistd.h File 4.58 KB 0644