| /* $Id: checksum.h,v 1.33 2002/02/01 22:01:05 davem Exp $ */ |
| #ifndef __SPARC_CHECKSUM_H |
| #define __SPARC_CHECKSUM_H |
| |
| /* checksum.h: IP/UDP/TCP checksum routines on the Sparc. |
| * |
| * 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 __wsum csum_partial(const void *buff, int len, __wsum sum); |
| |
| /* the same as csum_partial, but copies from fs:src 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_sparc_generic (const unsigned char *, unsigned char *); |
| |
| static inline __wsum |
| csum_partial_copy_nocheck(const void *src, void *dst, int len, __wsum sum) |
| { |
| register unsigned int ret asm("o0") = (unsigned int)src; |
| register char *d asm("o1") = dst; |
| register int l asm("g1") = len; |
| |
| __asm__ __volatile__ ( |
| "call __csum_partial_copy_sparc_generic\n\t" |
| " mov %6, %%g7\n" |
| : "=&r" (ret), "=&r" (d), "=&r" (l) |
| : "0" (ret), "1" (d), "2" (l), "r" (sum) |
| : "o2", "o3", "o4", "o5", "o7", |
| "g2", "g3", "g4", "g5", "g7", |
| "memory", "cc"); |
| return (__force __wsum)ret; |
| } |
| |
| static inline __wsum |
| csum_partial_copy_from_user(const void __user *src, void *dst, int len, |
| __wsum sum, int *err) |
| { |
| register unsigned long ret asm("o0") = (unsigned long)src; |
| register char *d asm("o1") = dst; |
| register int l asm("g1") = len; |
| register __wsum s asm("g7") = sum; |
| |
| __asm__ __volatile__ ( |
| ".section __ex_table,#alloc\n\t" |
| ".align 4\n\t" |
| ".word 1f,2\n\t" |
| ".previous\n" |
| "1:\n\t" |
| "call __csum_partial_copy_sparc_generic\n\t" |
| " st %8, [%%sp + 64]\n" |
| : "=&r" (ret), "=&r" (d), "=&r" (l), "=&r" (s) |
| : "0" (ret), "1" (d), "2" (l), "3" (s), "r" (err) |
| : "o2", "o3", "o4", "o5", "o7", "g2", "g3", "g4", "g5", |
| "cc", "memory"); |
| return (__force __wsum)ret; |
| } |
| |
| static inline __wsum |
| csum_partial_copy_to_user(const void *src, void __user *dst, int len, |
| __wsum sum, int *err) |
| { |
| if (!access_ok (VERIFY_WRITE, dst, len)) { |
| *err = -EFAULT; |
| return sum; |
| } else { |
| register unsigned long ret asm("o0") = (unsigned long)src; |
| register char __user *d asm("o1") = dst; |
| register int l asm("g1") = len; |
| register __wsum s asm("g7") = sum; |
| |
| __asm__ __volatile__ ( |
| ".section __ex_table,#alloc\n\t" |
| ".align 4\n\t" |
| ".word 1f,1\n\t" |
| ".previous\n" |
| "1:\n\t" |
| "call __csum_partial_copy_sparc_generic\n\t" |
| " st %8, [%%sp + 64]\n" |
| : "=&r" (ret), "=&r" (d), "=&r" (l), "=&r" (s) |
| : "0" (ret), "1" (d), "2" (l), "3" (s), "r" (err) |
| : "o2", "o3", "o4", "o5", "o7", |
| "g2", "g3", "g4", "g5", |
| "cc", "memory"); |
| return (__force __wsum)ret; |
| } |
| } |
| |
| #define HAVE_CSUM_COPY_USER |
| #define csum_and_copy_to_user csum_partial_copy_to_user |
| |
| /* ihl is always 5 or greater, almost always is 5, and iph is word aligned |
| * the majority of the time. |
| */ |
| static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl) |
| { |
| __sum16 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\t%2, 4, %%g4\n\t" |
| "ld\t[%1 + 0x00], %0\n\t" |
| "ld\t[%1 + 0x04], %%g2\n\t" |
| "ld\t[%1 + 0x08], %%g3\n\t" |
| "addcc\t%%g2, %0, %0\n\t" |
| "addxcc\t%%g3, %0, %0\n\t" |
| "ld\t[%1 + 0x0c], %%g2\n\t" |
| "ld\t[%1 + 0x10], %%g3\n\t" |
| "addxcc\t%%g2, %0, %0\n\t" |
| "addx\t%0, %%g0, %0\n" |
| "1:\taddcc\t%%g3, %0, %0\n\t" |
| "add\t%1, 4, %1\n\t" |
| "addxcc\t%0, %%g0, %0\n\t" |
| "subcc\t%%g4, 1, %%g4\n\t" |
| "be,a\t2f\n\t" |
| "sll\t%0, 16, %%g2\n\t" |
| "b\t1b\n\t" |
| "ld\t[%1 + 0x10], %%g3\n" |
| "2:\taddcc\t%0, %%g2, %%g2\n\t" |
| "srl\t%%g2, 16, %0\n\t" |
| "addx\t%0, %%g0, %0\n\t" |
| "xnor\t%%g0, %0, %0" |
| : "=r" (sum), "=&r" (iph) |
| : "r" (ihl), "1" (iph) |
| : "g2", "g3", "g4", "cc", "memory"); |
| return sum; |
| } |
| |
| /* Fold a partial checksum without adding pseudo headers. */ |
| static inline __sum16 csum_fold(__wsum sum) |
| { |
| unsigned int tmp; |
| |
| __asm__ __volatile__("addcc\t%0, %1, %1\n\t" |
| "srl\t%1, 16, %1\n\t" |
| "addx\t%1, %%g0, %1\n\t" |
| "xnor\t%%g0, %1, %0" |
| : "=&r" (sum), "=r" (tmp) |
| : "0" (sum), "1" ((__force u32)sum<<16) |
| : "cc"); |
| return (__force __sum16)sum; |
| } |
| |
| static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr, |
| unsigned short len, |
| unsigned short proto, |
| __wsum sum) |
| { |
| __asm__ __volatile__("addcc\t%1, %0, %0\n\t" |
| "addxcc\t%2, %0, %0\n\t" |
| "addxcc\t%3, %0, %0\n\t" |
| "addx\t%0, %%g0, %0\n\t" |
| : "=r" (sum), "=r" (saddr) |
| : "r" (daddr), "r" (proto + 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 __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)); |
| } |
| |
| #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) |
| { |
| __asm__ __volatile__ ( |
| "addcc %3, %4, %%g4\n\t" |
| "addxcc %5, %%g4, %%g4\n\t" |
| "ld [%2 + 0x0c], %%g2\n\t" |
| "ld [%2 + 0x08], %%g3\n\t" |
| "addxcc %%g2, %%g4, %%g4\n\t" |
| "ld [%2 + 0x04], %%g2\n\t" |
| "addxcc %%g3, %%g4, %%g4\n\t" |
| "ld [%2 + 0x00], %%g3\n\t" |
| "addxcc %%g2, %%g4, %%g4\n\t" |
| "ld [%1 + 0x0c], %%g2\n\t" |
| "addxcc %%g3, %%g4, %%g4\n\t" |
| "ld [%1 + 0x08], %%g3\n\t" |
| "addxcc %%g2, %%g4, %%g4\n\t" |
| "ld [%1 + 0x04], %%g2\n\t" |
| "addxcc %%g3, %%g4, %%g4\n\t" |
| "ld [%1 + 0x00], %%g3\n\t" |
| "addxcc %%g2, %%g4, %%g4\n\t" |
| "addxcc %%g3, %%g4, %0\n\t" |
| "addx 0, %0, %0\n" |
| : "=&r" (sum) |
| : "r" (saddr), "r" (daddr), |
| "r"(htonl(len)), "r"(htonl(proto)), "r"(sum) |
| : "g2", "g3", "g4", "cc"); |
| |
| return csum_fold(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)); |
| } |
| |
| #endif /* !(__SPARC_CHECKSUM_H) */ |