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Diffstat (limited to 'include/asm-sparc64/checksum.h')
| -rw-r--r-- | include/asm-sparc64/checksum.h | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/include/asm-sparc64/checksum.h b/include/asm-sparc64/checksum.h new file mode 100644 index 000000000000..dc8bed246fc9 --- /dev/null +++ b/include/asm-sparc64/checksum.h @@ -0,0 +1,173 @@ +/* $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_nocheck(const unsigned char *src, + unsigned char *dst, + int len, unsigned int sum); + +extern long __csum_partial_copy_from_user(const unsigned char __user *src, + unsigned char *dst, int len, + unsigned int sum); + +static inline unsigned int +csum_partial_copy_from_user(const unsigned char __user *src, + unsigned char *dst, int len, + unsigned int sum, int *err) +{ + long ret = __csum_partial_copy_from_user(src, dst, len, sum); + if (ret < 0) + *err = -EFAULT; + return (unsigned int) ret; +} + +/* + * Copy and checksum to user + */ +#define HAVE_CSUM_COPY_USER +extern long __csum_partial_copy_to_user(const unsigned char *src, + unsigned char __user *dst, int len, + unsigned int sum); + +static inline unsigned int +csum_and_copy_to_user(const unsigned char *src, + unsigned char __user *dst, int len, + unsigned int sum, int *err) +{ + long ret = __csum_partial_copy_to_user(src, dst, len, sum); + if (ret < 0) + *err = -EFAULT; + return (unsigned int) ret; +} + +/* ihl is always 5 or greater, almost always is 5, and iph is word aligned + * the majority of the time. + */ +extern unsigned short ip_fast_csum(__const__ unsigned char *iph, + unsigned int ihl); + +/* Fold a partial checksum without adding pseudo headers. */ +static 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); +} + +static 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 */ +static inline unsigned short ip_compute_csum(unsigned char * buff, int len) +{ + return csum_fold(csum_partial(buff, len, 0)); +} + +#endif /* !(__SPARC64_CHECKSUM_H) */ |