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11/17/2022 06:42:16 AM
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Kbuild
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agp.h
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asm-offsets.h
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unwind.h
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Editing: checksum.h
Close
/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _PARISC_CHECKSUM_H #define _PARISC_CHECKSUM_H #include <linux/in6.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 *, int, __wsum); /* * 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_nocheck(const void *, void *, int, __wsum); /* * this is a new version of the above that records errors it finds in *errp, * but continues and zeros the rest of the buffer. */ extern __wsum csum_partial_copy_from_user(const void __user *src, void *dst, int len, __wsum sum, int *errp); /* * Optimized for IP headers, which always checksum on 4 octet boundaries. * * Written by Randolph Chung <tausq@debian.org>, and then mucked with by * LaMont Jones <lamont@debian.org> */ static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl) { unsigned int sum; __asm__ __volatile__ ( " ldws,ma 4(%1), %0\n" " addib,<= -4, %2, 2f\n" "\n" " ldws 4(%1), %%r20\n" " ldws 8(%1), %%r21\n" " add %0, %%r20, %0\n" " ldws,ma 12(%1), %%r19\n" " addc %0, %%r21, %0\n" " addc %0, %%r19, %0\n" "1: ldws,ma 4(%1), %%r19\n" " addib,< 0, %2, 1b\n" " addc %0, %%r19, %0\n" "\n" " extru %0, 31, 16, %%r20\n" " extru %0, 15, 16, %%r21\n" " addc %%r20, %%r21, %0\n" " extru %0, 15, 16, %%r21\n" " add %0, %%r21, %0\n" " subi -1, %0, %0\n" "2:\n" : "=r" (sum), "=r" (iph), "=r" (ihl) : "1" (iph), "2" (ihl) : "r19", "r20", "r21", "memory"); return (__force __sum16)sum; } /* * Fold a partial checksum */ static inline __sum16 csum_fold(__wsum csum) { u32 sum = (__force u32)csum; /* add the swapped two 16-bit halves of sum, a possible carry from adding the two 16-bit halves, will carry from the lower half into the upper half, giving us the correct sum in the upper half. */ sum += (sum << 16) + (sum >> 16); return (__force __sum16)(~sum >> 16); } static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr, __u32 len, __u8 proto, __wsum sum) { __asm__( " add %1, %0, %0\n" " addc %2, %0, %0\n" " addc %3, %0, %0\n" " addc %%r0, %0, %0\n" : "=r" (sum) : "r" (daddr), "r"(saddr), "r"(proto+len), "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, __u32 len, __u8 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 *buf, int len) { return csum_fold (csum_partial(buf, 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, __u8 proto, __wsum sum) { __asm__ __volatile__ ( #if BITS_PER_LONG > 32 /* ** We can execute two loads and two adds per cycle on PA 8000. ** But add insn's get serialized waiting for the carry bit. ** Try to keep 4 registers with "live" values ahead of the ALU. */ " ldd,ma 8(%1), %%r19\n" /* get 1st saddr word */ " ldd,ma 8(%2), %%r20\n" /* get 1st daddr word */ " add %8, %3, %3\n"/* add 16-bit proto + len */ " add %%r19, %0, %0\n" " ldd,ma 8(%1), %%r21\n" /* 2cd saddr */ " ldd,ma 8(%2), %%r22\n" /* 2cd daddr */ " add,dc %%r20, %0, %0\n" " add,dc %%r21, %0, %0\n" " add,dc %%r22, %0, %0\n" " add,dc %3, %0, %0\n" /* fold in proto+len | carry bit */ " extrd,u %0, 31, 32, %%r19\n" /* copy upper half down */ " depdi 0, 31, 32, %0\n" /* clear upper half */ " add %%r19, %0, %0\n" /* fold into 32-bits */ " addc 0, %0, %0\n" /* add carry */ #else /* ** For PA 1.x, the insn order doesn't matter as much. ** Insn stream is serialized on the carry bit here too. ** result from the previous operation (eg r0 + x) */ " ldw,ma 4(%1), %%r19\n" /* get 1st saddr word */ " ldw,ma 4(%2), %%r20\n" /* get 1st daddr word */ " add %8, %3, %3\n" /* add 16-bit proto + len */ " add %%r19, %0, %0\n" " ldw,ma 4(%1), %%r21\n" /* 2cd saddr */ " addc %%r20, %0, %0\n" " ldw,ma 4(%2), %%r22\n" /* 2cd daddr */ " addc %%r21, %0, %0\n" " ldw,ma 4(%1), %%r19\n" /* 3rd saddr */ " addc %%r22, %0, %0\n" " ldw,ma 4(%2), %%r20\n" /* 3rd daddr */ " addc %%r19, %0, %0\n" " ldw,ma 4(%1), %%r21\n" /* 4th saddr */ " addc %%r20, %0, %0\n" " ldw,ma 4(%2), %%r22\n" /* 4th daddr */ " addc %%r21, %0, %0\n" " addc %%r22, %0, %0\n" " addc %3, %0, %0\n" /* fold in proto+len, catch carry */ #endif : "=r" (sum), "=r" (saddr), "=r" (daddr), "=r" (len) : "0" (sum), "1" (saddr), "2" (daddr), "3" (len), "r" (proto) : "r19", "r20", "r21", "r22", "memory"); return csum_fold(sum); } /* * Copy and checksum to user */ #define HAVE_CSUM_COPY_USER static __inline__ __wsum csum_and_copy_to_user(const void *src, void __user *dst, int len, __wsum sum, int *err_ptr) { /* code stolen from include/asm-mips64 */ sum = csum_partial(src, len, sum); if (copy_to_user(dst, src, len)) { *err_ptr = -EFAULT; return (__force __wsum)-1; } return sum; } #endif