#ifdef __KERNEL__ #ifndef _ASM_M32R_CHECKSUM_H #define _ASM_M32R_CHECKSUM_H /* * include/asm-m32r/checksum.h * * IP/TCP/UDP checksum routines * * 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. * * Some code taken from mips and parisc architecture. * * Copyright (C) 2001, 2002 Hiroyuki Kondo, Hirokazu Takata * Copyright (C) 2004 Hirokazu Takata <takata at linux-m32r.org> */ #include <linux/in6.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); /* * The same as csum_partial, but copies from src while it checksums. * * Here even more important to align src and dst on a 32-bit (or even * better 64-bit) boundary */ extern unsigned int csum_partial_copy_nocheck(const unsigned char *src, unsigned char *dst, int len, unsigned int sum); /* * This is a new version of the above that records errors it finds in *errp, * but continues and zeros thre rest of the buffer. */ extern unsigned int csum_partial_copy_from_user(const unsigned char __user *src, unsigned char *dst, int len, unsigned int sum, int *err_ptr); /* * Fold a partial checksum */ static inline unsigned int csum_fold(unsigned int sum) { unsigned long tmpreg; __asm__( " sll3 %1, %0, #16 \n" " cmp %0, %0 \n" " addx %0, %1 \n" " ldi %1, #0 \n" " srli %0, #16 \n" " addx %0, %1 \n" " xor3 %0, %0, #0x0000ffff \n" : "=r" (sum), "=&r" (tmpreg) : "0" (sum) : "cbit" ); return sum; } /* * This is a version of ip_compute_csum() optimized for IP headers, * which always checksum on 4 octet boundaries. */ static inline unsigned short ip_fast_csum(unsigned char * iph, unsigned int ihl) { unsigned long sum, tmpreg0, tmpreg1; __asm__ __volatile__( " ld %0, @%1+ \n" " addi %2, #-4 \n" "# bgez %2, 2f \n" " cmp %0, %0 \n" " ld %3, @%1+ \n" " ld %4, @%1+ \n" " addx %0, %3 \n" " ld %3, @%1+ \n" " addx %0, %4 \n" " addx %0, %3 \n" " .fillinsn\n" "1: \n" " ld %4, @%1+ \n" " addi %2, #-1 \n" " addx %0, %4 \n" " bgtz %2, 1b \n" "\n" " ldi %3, #0 \n" " addx %0, %3 \n" " .fillinsn\n" "2: \n" /* Since the input registers which are loaded with iph and ipl are modified, we must also specify them as outputs, or gcc will assume they contain their original values. */ : "=&r" (sum), "=r" (iph), "=r" (ihl), "=&r" (tmpreg0), "=&r" (tmpreg1) : "1" (iph), "2" (ihl) : "cbit", "memory"); return csum_fold(sum); } static inline unsigned long csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr, unsigned short len, unsigned short proto, unsigned int sum) { #if defined(__LITTLE_ENDIAN) unsigned long len_proto = (ntohs(len)<<16)+proto*256; #else unsigned long len_proto = (proto<<16)+len; #endif unsigned long tmpreg; __asm__( " cmp %0, %0 \n" " addx %0, %2 \n" " addx %0, %3 \n" " addx %0, %4 \n" " ldi %1, #0 \n" " addx %0, %1 \n" : "=r" (sum), "=&r" (tmpreg) : "r" (daddr), "r" (saddr), "r" (len_proto), "0" (sum) : "cbit" ); return 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)); } #define _HAVE_ARCH_IPV6_CSUM static inline unsigned short int csum_ipv6_magic(struct in6_addr *saddr, struct in6_addr *daddr, __u16 len, unsigned short proto, unsigned int sum) { unsigned long tmpreg0, tmpreg1, tmpreg2, tmpreg3; __asm__( " ld %1, @(%5) \n" " ld %2, @(4,%5) \n" " ld %3, @(8,%5) \n" " ld %4, @(12,%5) \n" " add %0, %1 \n" " addx %0, %2 \n" " addx %0, %3 \n" " addx %0, %4 \n" " ld %1, @(%6) \n" " ld %2, @(4,%6) \n" " ld %3, @(8,%6) \n" " ld %4, @(12,%6) \n" " addx %0, %1 \n" " addx %0, %2 \n" " addx %0, %3 \n" " addx %0, %4 \n" " addx %0, %7 \n" " addx %0, %8 \n" " ldi %1, #0 \n" " addx %0, %1 \n" : "=&r" (sum), "=&r" (tmpreg0), "=&r" (tmpreg1), "=&r" (tmpreg2), "=&r" (tmpreg3) : "r" (saddr), "r" (daddr), "r" (htonl((__u32) (len))), "r" (htonl(proto)), "0" (sum) : "cbit" ); return csum_fold(sum); } #endif /* _ASM_M32R_CHECKSUM_H */ #endif /* __KERNEL__ */