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/* SPDX-License-Identifier: GPL-2.0 / #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 <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 user space while it * checksums * * here even more important to align src and dst on a 32-bit (or even * better 64-bit) boundary / __wsum csum_partial_copy_nocheck(const void src, void dst, int len, __wsum sum); long __csum_partial_copy_from_user(const void __user src, void dst, int len, __wsum sum); static inline __wsum csum_partial_copy_from_user(const void __user src, void dst, int len, __wsum sum, int err) { long ret = __csum_partial_copy_from_user(src, dst, len, sum); if (ret < 0) err = -EFAULT; return (__force __wsum) ret; } / * Copy and checksum to user / #define HAVE_CSUM_COPY_USER long __csum_partial_copy_to_user(const void src, void __user dst, int len, __wsum sum); static inline __wsum csum_and_copy_to_user(const void src, void __user dst, int len, __wsum sum, int err) { long ret = __csum_partial_copy_to_user(src, dst, len, sum); if (ret < 0) err = -EFAULT; return (__force __wsum) ret; } / ihl is always 5 or greater, almost always is 5, and iph is word aligned * the majority of the time. / __sum16 ip_fast_csum(const void iph, unsigned int ihl); /* Fold a partial checksum without adding pseudo headers. / static inline __sum16 csum_fold(__wsum 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" ((__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 %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 + 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, %%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 __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 /* !(__SPARC64_CHECKSUM_H) */

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