/* $Id: checksum.h,v 1.17 2001/04/24 01:09:12 davem Exp $ */ #ifndef __SPARC64_CHECKSUM_H #define __SPARC64_CHECKSUM_H /* checksum.h: IP/UDP/TCP checksum routines on the V9. * * Copyright(C) 1995 Linus Torvalds * Copyright(C) 1995 Miguel de Icaza * Copyright(C) 1996 David S. Miller * Copyright(C) 1996 Eddie C. Dost * Copyright(C) 1997 Jakub Jelinek * * derived from: * Alpha checksum c-code * ix86 inline assembly * RFC1071 Computing the Internet Checksum */ #include /* 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 */ extern unsigned int csum_partial(const unsigned char * buff, int len, unsigned int sum); /* the same as csum_partial, but copies from user space 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_sparc64(const char *src, char *dst, int len, unsigned int sum); extern __inline__ unsigned int csum_partial_copy_nocheck (const char *src, char *dst, int len, unsigned int sum) { int ret; unsigned char cur_ds = current->thread.current_ds.seg; __asm__ __volatile__ ("wr %%g0, %0, %%asi" : : "i" (ASI_P)); ret = csum_partial_copy_sparc64(src, dst, len, sum); __asm__ __volatile__ ("wr %%g0, %0, %%asi" : : "r" (cur_ds)); return ret; } extern __inline__ unsigned int csum_partial_copy_from_user(const char *src, char *dst, int len, unsigned int sum, int *err) { __asm__ __volatile__ ("stx %0, [%%sp + 0x7ff + 128]" : : "r" (err)); return csum_partial_copy_sparc64(src, dst, len, sum); } /* * Copy and checksum to user */ #define HAVE_CSUM_COPY_USER extern unsigned int csum_partial_copy_user_sparc64(const char *src, char *dst, int len, unsigned int sum); extern __inline__ unsigned int csum_and_copy_to_user(const char *src, char *dst, int len, unsigned int sum, int *err) { __asm__ __volatile__ ("stx %0, [%%sp + 0x7ff + 128]" : : "r" (err)); return csum_partial_copy_user_sparc64(src, dst, len, sum); } /* ihl is always 5 or greater, almost always is 5, and iph is word aligned * the majority of the time. */ extern __inline__ unsigned short ip_fast_csum(__const__ unsigned char *iph, unsigned int ihl) { unsigned short sum; /* Note: We must read %2 before we touch %0 for the first time, * because GCC can legitimately use the same register for * both operands. */ __asm__ __volatile__( " sub %2, 4, %%g7 ! IEU0\n" " lduw [%1 + 0x00], %0 ! Load Group\n" " lduw [%1 + 0x04], %%g2 ! Load Group\n" " lduw [%1 + 0x08], %%g3 ! Load Group\n" " addcc %%g2, %0, %0 ! IEU1 1 Load Bubble + Group\n" " lduw [%1 + 0x0c], %%g2 ! Load\n" " addccc %%g3, %0, %0 ! Sngle Group no Bubble\n" " lduw [%1 + 0x10], %%g3 ! Load Group\n" " addccc %%g2, %0, %0 ! Sngle Group no Bubble\n" " addc %0, %%g0, %0 ! Sngle Group\n" "1: addcc %%g3, %0, %0 ! IEU1 Group no Bubble\n" " add %1, 4, %1 ! IEU0\n" " addccc %0, %%g0, %0 ! Sngle Group no Bubble\n" " subcc %%g7, 1, %%g7 ! IEU1 Group\n" " be,a,pt %%icc, 2f ! CTI\n" " sll %0, 16, %%g2 ! IEU0\n" " lduw [%1 + 0x10], %%g3 ! Load Group\n" " ba,pt %%xcc, 1b ! CTI\n" " nop ! IEU0\n" "2: addcc %0, %%g2, %%g2 ! IEU1 Group\n" " srl %%g2, 16, %0 ! IEU0 Group regdep XXX Scheisse!\n" " addc %0, %%g0, %0 ! Sngle Group\n" " xnor %%g0, %0, %0 ! IEU0 Group\n" " srl %0, 0, %0 ! IEU0 Group XXX Scheisse!\n" : "=r" (sum), "=&r" (iph) : "r" (ihl), "1" (iph) : "g2", "g3", "g7", "cc"); return sum; } /* Fold a partial checksum without adding pseudo headers. */ extern __inline__ unsigned short csum_fold(unsigned int sum) { unsigned int tmp; __asm__ __volatile__( " addcc %0, %1, %1\n" " srl %1, 16, %1\n" " addc %1, %%g0, %1\n" " xnor %%g0, %1, %0\n" : "=&r" (sum), "=r" (tmp) : "0" (sum), "1" (sum<<16) : "cc"); return (sum & 0xffff); } extern __inline__ unsigned long csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr, unsigned int len, unsigned short proto, unsigned int sum) { __asm__ __volatile__( " addcc %1, %0, %0\n" " addccc %2, %0, %0\n" " addccc %3, %0, %0\n" " addc %0, %%g0, %0\n" : "=r" (sum), "=r" (saddr) : "r" (daddr), "r" ((proto<<16)+len), "0" (sum), "1" (saddr) : "cc"); 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)); } #define _HAVE_ARCH_IPV6_CSUM static __inline__ unsigned short int csum_ipv6_magic(struct in6_addr *saddr, struct in6_addr *daddr, __u32 len, unsigned short proto, unsigned int sum) { __asm__ __volatile__ ( " addcc %3, %4, %%g7\n" " addccc %5, %%g7, %%g7\n" " lduw [%2 + 0x0c], %%g2\n" " lduw [%2 + 0x08], %%g3\n" " addccc %%g2, %%g7, %%g7\n" " lduw [%2 + 0x04], %%g2\n" " addccc %%g3, %%g7, %%g7\n" " lduw [%2 + 0x00], %%g3\n" " addccc %%g2, %%g7, %%g7\n" " lduw [%1 + 0x0c], %%g2\n" " addccc %%g3, %%g7, %%g7\n" " lduw [%1 + 0x08], %%g3\n" " addccc %%g2, %%g7, %%g7\n" " lduw [%1 + 0x04], %%g2\n" " addccc %%g3, %%g7, %%g7\n" " lduw [%1 + 0x00], %%g3\n" " addccc %%g2, %%g7, %%g7\n" " addccc %%g3, %%g7, %0\n" " addc 0, %0, %0\n" : "=&r" (sum) : "r" (saddr), "r" (daddr), "r"(htonl(len)), "r"(htonl(proto)), "r"(sum) : "g2", "g3", "g7", "cc"); return csum_fold(sum); } /* this routine is used for miscellaneous IP-like checksums, mainly in icmp.c */ extern __inline__ unsigned short ip_compute_csum(unsigned char * buff, int len) { return csum_fold(csum_partial(buff, len, 0)); } #endif /* !(__SPARC64_CHECKSUM_H) */