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/* SPDX-License-Identifier: GPL-2.0 / #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 <linux/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 / __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 / 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(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, __u32 len, __u8 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, __u32 len, __u8 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, __u8 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)); } #define HAVE_ARCH_CSUM_ADD static inline __wsum csum_add(__wsum csum, __wsum addend) { __asm__ __volatile__( "addcc %0, %1, %0\n" "addx %0, %%g0, %0" : "=r" (csum) : "r" (addend), "0" (csum)); return csum; } #endif /* !(__SPARC_CHECKSUM_H) */

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