From 9fd51e9b0ad33a89a83fdbbb66bd20d85f7893fb Mon Sep 17 00:00:00 2001 From: Roland McGrath Date: Fri, 4 Feb 2000 03:21:18 +0000 Subject: Import of Linux 2.2.12 subset (ipv4 stack and related) --- pfinet/linux-src/include/asm-sparc64/checksum.h | 207 ++++++++++++++++++++++++ 1 file changed, 207 insertions(+) create mode 100644 pfinet/linux-src/include/asm-sparc64/checksum.h (limited to 'pfinet/linux-src/include/asm-sparc64') diff --git a/pfinet/linux-src/include/asm-sparc64/checksum.h b/pfinet/linux-src/include/asm-sparc64/checksum.h new file mode 100644 index 00000000..e3da2651 --- /dev/null +++ b/pfinet/linux-src/include/asm-sparc64/checksum.h @@ -0,0 +1,207 @@ +/* $Id: checksum.h,v 1.11 1998/04/17 02:37:22 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(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 + */ +/* FIXME: Remove these macros ASAP */ +#define csum_partial_copy(src, dst, len, sum) \ + csum_partial_copy_nocheck(src,dst,len,sum) +#define csum_partial_copy_fromuser(s, d, l, w) \ + csum_partial_copy_from_user((char *) (s), (d), (l), (w), NULL) + +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) +{ + __asm__ __volatile__ ("wr %%g0, %0, %%asi" : : "i" (ASI_P)); + return csum_partial_copy_sparc64(src, dst, len, sum); +} + +extern __inline__ unsigned int +csum_partial_copy_from_user(const char *src, char *dst, int len, + unsigned int sum, int *err) +{ + __asm__ __volatile__ ("wr %%g0, %0, %%asi + stx %1, [%%sp + 0x7ff + 128] + " : : "i" (ASI_S), "r" (err)); + return csum_partial_copy_sparc64(src, dst, len, sum); +} + +#if 0 +/* Not implemented, but nobody uses it yet... */ +extern __inline__ unsigned int +csum_partial_copy_to_user(const char *src, char *dst, int len, + unsigned int sum, int *err) +{ + return 0; +} +#endif + +/* 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 + lduw [%1 + 0x00], %0 ! Load Group + lduw [%1 + 0x04], %%g2 ! Load Group + lduw [%1 + 0x08], %%g3 ! Load Group + addcc %%g2, %0, %0 ! IEU1 1 Load Bubble + Group + lduw [%1 + 0x0c], %%g2 ! Load + addccc %%g3, %0, %0 ! Sngle Group no Bubble + lduw [%1 + 0x10], %%g3 ! Load Group + addccc %%g2, %0, %0 ! Sngle Group no Bubble + addc %0, %%g0, %0 ! Sngle Group +1: addcc %%g3, %0, %0 ! IEU1 Group no Bubble + add %1, 4, %1 ! IEU0 + addccc %0, %%g0, %0 ! Sngle Group no Bubble + subcc %%g7, 1, %%g7 ! IEU1 Group + be,a,pt %%icc, 2f ! CTI + sll %0, 16, %%g2 ! IEU0 + lduw [%1 + 0x10], %%g3 ! Load Group + ba,pt %%xcc, 1b ! CTI + nop ! IEU0 +2: addcc %0, %%g2, %%g2 ! IEU1 Group + srl %%g2, 16, %0 ! IEU0 Group regdep XXX Scheisse! + addc %0, %%g0, %0 ! Sngle Group + xnor %%g0, %0, %0 ! IEU0 Group + srl %0, 0, %0 ! IEU0 Group XXX Scheisse! +" : "=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 + srl %1, 16, %1 + addc %1, %%g0, %1 + xnor %%g0, %1, %0 +" : "=&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 + addccc %2, %0, %0 + addccc %3, %0, %0 + addc %0, %%g0, %0 +" : "=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, + __u16 len, + unsigned short proto, + unsigned int sum) +{ + __asm__ __volatile__ (" + addcc %3, %4, %%g7 + addccc %5, %%g7, %%g7 + lduw [%2 + 0x0c], %%g2 + lduw [%2 + 0x08], %%g3 + addccc %%g2, %%g7, %%g7 + lduw [%2 + 0x04], %%g2 + addccc %%g3, %%g7, %%g7 + lduw [%2 + 0x00], %%g3 + addccc %%g2, %%g7, %%g7 + lduw [%1 + 0x0c], %%g2 + addccc %%g3, %%g7, %%g7 + lduw [%1 + 0x08], %%g3 + addccc %%g2, %%g7, %%g7 + lduw [%1 + 0x04], %%g2 + addccc %%g3, %%g7, %%g7 + lduw [%1 + 0x00], %%g3 + addccc %%g2, %%g7, %%g7 + addccc %%g3, %%g7, %0 + addc 0, %0, %0 +" : "=&r" (sum) + : "r" (saddr), "r" (daddr), "r"(htonl((__u32) (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) */ -- cgit v1.2.3