#ifndef __ASM_SH64_CHECKSUM_H #define __ASM_SH64_CHECKSUM_H /* * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. * * include/asm-sh64/checksum.h * * Copyright (C) 2000, 2001 Paolo Alberelli * */ #include <asm/registers.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 */ asmlinkage unsigned int csum_partial(const unsigned char *buff, int len, unsigned int sum); /* * Note: when you get a NULL pointer exception here this means someone * passed in an incorrect kernel address to one of these functions. * * If you use these functions directly please don't forget the * access_ok(). */ unsigned int csum_partial_copy_nocheck(const char *src, char *dst, int len, unsigned int sum); unsigned int csum_partial_copy_from_user(const char *src, char *dst, int len, int sum, int *err_ptr); /* * These are the old (and unsafe) way of doing checksums, a warning message will be * printed if they are used and an exeption occurs. * * these functions should go away after some time. */ #define csum_partial_copy_fromuser csum_partial_copy unsigned int csum_partial_copy(const char *src, char *dst, int len, unsigned int sum); static inline unsigned short csum_fold(unsigned int sum) { sum = (sum & 0xffff) + (sum >> 16); sum = (sum & 0xffff) + (sum >> 16); return ~(sum); } unsigned short ip_fast_csum(unsigned char * iph, unsigned int ihl); unsigned long csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr, unsigned short len, unsigned short proto, unsigned int sum); /* * computes the checksum of the TCP/UDP pseudo-header * returns a 16-bit checksum, already complemented */ static inline unsigned short int csum_tcpudp_magic(unsigned long saddr, unsigned long daddr, unsigned short len, unsigned short proto, unsigned int 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 */ static inline unsigned short ip_compute_csum(unsigned char * buff, int len) { return csum_fold(csum_partial(buff, len, 0)); } #endif /* __ASM_SH64_CHECKSUM_H */