| #ifndef _M68K_CHECKSUM_H |
| #define _M68K_CHECKSUM_H |
| |
| #include <linux/in6.h> |
| |
| #ifdef CONFIG_GENERIC_CSUM |
| #include <asm-generic/checksum.h> |
| #else |
| |
| /* |
| * 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 |
| */ |
| __wsum csum_partial(const void *buff, int len, __wsum 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 __wsum csum_partial_copy_from_user(const void __user *src, |
| void *dst, |
| int len, __wsum sum, |
| int *csum_err); |
| |
| extern __wsum csum_partial_copy_nocheck(const void *src, |
| void *dst, int len, |
| __wsum sum); |
| |
| /* |
| * This is a version of ip_fast_csum() optimized for IP headers, |
| * which always checksum on 4 octet boundaries. |
| */ |
| static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl) |
| { |
| unsigned int sum = 0; |
| unsigned long tmp; |
| |
| __asm__ ("subqw #1,%2\n" |
| "1:\t" |
| "movel %1@+,%3\n\t" |
| "addxl %3,%0\n\t" |
| "dbra %2,1b\n\t" |
| "movel %0,%3\n\t" |
| "swap %3\n\t" |
| "addxw %3,%0\n\t" |
| "clrw %3\n\t" |
| "addxw %3,%0\n\t" |
| : "=d" (sum), "=&a" (iph), "=&d" (ihl), "=&d" (tmp) |
| : "0" (sum), "1" (iph), "2" (ihl) |
| : "memory"); |
| return (__force __sum16)~sum; |
| } |
| |
| static inline __sum16 csum_fold(__wsum sum) |
| { |
| unsigned int tmp = (__force u32)sum; |
| |
| __asm__("swap %1\n\t" |
| "addw %1, %0\n\t" |
| "clrw %1\n\t" |
| "addxw %1, %0" |
| : "=&d" (sum), "=&d" (tmp) |
| : "0" (sum), "1" (tmp)); |
| |
| return (__force __sum16)~sum; |
| } |
| |
| static inline __wsum |
| csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len, |
| unsigned short proto, __wsum sum) |
| { |
| __asm__ ("addl %2,%0\n\t" |
| "addxl %3,%0\n\t" |
| "addxl %4,%0\n\t" |
| "clrl %1\n\t" |
| "addxl %1,%0" |
| : "=&d" (sum), "=d" (saddr) |
| : "g" (daddr), "1" (saddr), "d" (len + proto), |
| "0" (sum)); |
| return sum; |
| } |
| |
| |
| /* |
| * computes the checksum of the TCP/UDP pseudo-header |
| * returns a 16-bit checksum, already complemented |
| */ |
| static inline __sum16 |
| csum_tcpudp_magic(__be32 saddr, __be32 daddr, unsigned short len, |
| unsigned short proto, __wsum 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 __sum16 ip_compute_csum(const void *buff, int len) |
| { |
| return csum_fold (csum_partial(buff, len, 0)); |
| } |
| |
| #define _HAVE_ARCH_IPV6_CSUM |
| static __inline__ __sum16 |
| csum_ipv6_magic(const struct in6_addr *saddr, const struct in6_addr *daddr, |
| __u32 len, unsigned short proto, __wsum sum) |
| { |
| register unsigned long tmp; |
| __asm__("addl %2@,%0\n\t" |
| "movel %2@(4),%1\n\t" |
| "addxl %1,%0\n\t" |
| "movel %2@(8),%1\n\t" |
| "addxl %1,%0\n\t" |
| "movel %2@(12),%1\n\t" |
| "addxl %1,%0\n\t" |
| "movel %3@,%1\n\t" |
| "addxl %1,%0\n\t" |
| "movel %3@(4),%1\n\t" |
| "addxl %1,%0\n\t" |
| "movel %3@(8),%1\n\t" |
| "addxl %1,%0\n\t" |
| "movel %3@(12),%1\n\t" |
| "addxl %1,%0\n\t" |
| "addxl %4,%0\n\t" |
| "clrl %1\n\t" |
| "addxl %1,%0" |
| : "=&d" (sum), "=&d" (tmp) |
| : "a" (saddr), "a" (daddr), "d" (len + proto), |
| "0" (sum)); |
| |
| return csum_fold(sum); |
| } |
| |
| #endif /* CONFIG_GENERIC_CSUM */ |
| #endif /* _M68K_CHECKSUM_H */ |