arch/microblaze/include/asm/checksum.h

Source file repositories/reference/linux-study-clean/arch/microblaze/include/asm/checksum.h

File Facts

System
Linux kernel
Corpus path
arch/microblaze/include/asm/checksum.h
Extension
.h
Size
806 bytes
Lines
37
Domain
Architecture Layer
Bucket
arch/microblaze
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

#ifndef _ASM_MICROBLAZE_CHECKSUM_H
#define _ASM_MICROBLAZE_CHECKSUM_H

/*
 * computes the checksum of the TCP/UDP pseudo-header
 * returns a 16-bit checksum, already complemented
 */
#define csum_tcpudp_nofold	csum_tcpudp_nofold
static inline __wsum
csum_tcpudp_nofold(__be32 saddr, __be32 daddr, __u32 len,
		   __u8 proto, __wsum sum)
{
	__asm__("add %0, %0, %1\n\t"
		"addc %0, %0, %2\n\t"
		"addc %0, %0, %3\n\t"
		"addc %0, %0, r0\n\t"
		: "+&d" (sum)
		: "d" (saddr), "d" (daddr),
#ifdef __MICROBLAZEEL__
	"d" ((len + proto) << 8)
#else
	"d" (len + proto)
#endif
);
	return sum;
}

#include <asm-generic/checksum.h>

#endif /* _ASM_MICROBLAZE_CHECKSUM_H */

Annotation

Implementation Notes