| /* $Id: checksum.h,v 1.19 2002-02-09 19:49:31 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 <linux/in6.h> |
| #include <asm/uaccess.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 |
| */ |
| 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 = get_thread_current_ds(); |
| __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) */ |