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210 lines
5.7 KiB
210 lines
5.7 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef __SPARC_CHECKSUM_H |
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#define __SPARC_CHECKSUM_H |
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/* checksum.h: IP/UDP/TCP checksum routines on the Sparc. |
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* |
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* Copyright(C) 1995 Linus Torvalds |
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* Copyright(C) 1995 Miguel de Icaza |
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* Copyright(C) 1996 David S. Miller |
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* Copyright(C) 1996 Eddie C. Dost |
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* Copyright(C) 1997 Jakub Jelinek |
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* |
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* derived from: |
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* Alpha checksum c-code |
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* ix86 inline assembly |
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* RFC1071 Computing the Internet Checksum |
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*/ |
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#include <linux/in6.h> |
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#include <linux/uaccess.h> |
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|
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/* computes the checksum of a memory block at buff, length len, |
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* and adds in "sum" (32-bit) |
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* |
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* returns a 32-bit number suitable for feeding into itself |
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* or csum_tcpudp_magic |
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* |
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* this function must be called with even lengths, except |
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* for the last fragment, which may be odd |
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* |
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* it's best to have buff aligned on a 32-bit boundary |
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*/ |
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__wsum csum_partial(const void *buff, int len, __wsum sum); |
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/* the same as csum_partial, but copies from fs:src while it |
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* checksums |
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* |
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* here even more important to align src and dst on a 32-bit (or even |
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* better 64-bit) boundary |
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*/ |
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unsigned int __csum_partial_copy_sparc_generic (const unsigned char *, unsigned char *); |
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static inline __wsum |
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csum_partial_copy_nocheck(const void *src, void *dst, int len) |
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{ |
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register unsigned int ret asm("o0") = (unsigned int)src; |
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register char *d asm("o1") = dst; |
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register int l asm("g1") = len; |
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__asm__ __volatile__ ( |
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"call __csum_partial_copy_sparc_generic\n\t" |
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" mov -1, %%g7\n" |
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: "=&r" (ret), "=&r" (d), "=&r" (l) |
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: "0" (ret), "1" (d), "2" (l) |
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: "o2", "o3", "o4", "o5", "o7", |
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"g2", "g3", "g4", "g5", "g7", |
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"memory", "cc"); |
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return (__force __wsum)ret; |
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} |
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static inline __wsum |
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csum_and_copy_from_user(const void __user *src, void *dst, int len) |
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{ |
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if (unlikely(!access_ok(src, len))) |
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return 0; |
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return csum_partial_copy_nocheck((__force void *)src, dst, len); |
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} |
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static inline __wsum |
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csum_and_copy_to_user(const void *src, void __user *dst, int len) |
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{ |
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if (!access_ok(dst, len)) |
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return 0; |
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return csum_partial_copy_nocheck(src, (__force void *)dst, len); |
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} |
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/* ihl is always 5 or greater, almost always is 5, and iph is word aligned |
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* the majority of the time. |
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*/ |
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static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl) |
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{ |
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__sum16 sum; |
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/* Note: We must read %2 before we touch %0 for the first time, |
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* because GCC can legitimately use the same register for |
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* both operands. |
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*/ |
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__asm__ __volatile__("sub\t%2, 4, %%g4\n\t" |
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"ld\t[%1 + 0x00], %0\n\t" |
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"ld\t[%1 + 0x04], %%g2\n\t" |
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"ld\t[%1 + 0x08], %%g3\n\t" |
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"addcc\t%%g2, %0, %0\n\t" |
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"addxcc\t%%g3, %0, %0\n\t" |
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"ld\t[%1 + 0x0c], %%g2\n\t" |
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"ld\t[%1 + 0x10], %%g3\n\t" |
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"addxcc\t%%g2, %0, %0\n\t" |
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"addx\t%0, %%g0, %0\n" |
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"1:\taddcc\t%%g3, %0, %0\n\t" |
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"add\t%1, 4, %1\n\t" |
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"addxcc\t%0, %%g0, %0\n\t" |
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"subcc\t%%g4, 1, %%g4\n\t" |
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"be,a\t2f\n\t" |
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"sll\t%0, 16, %%g2\n\t" |
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"b\t1b\n\t" |
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"ld\t[%1 + 0x10], %%g3\n" |
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"2:\taddcc\t%0, %%g2, %%g2\n\t" |
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"srl\t%%g2, 16, %0\n\t" |
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"addx\t%0, %%g0, %0\n\t" |
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"xnor\t%%g0, %0, %0" |
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: "=r" (sum), "=&r" (iph) |
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: "r" (ihl), "1" (iph) |
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: "g2", "g3", "g4", "cc", "memory"); |
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return sum; |
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} |
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/* Fold a partial checksum without adding pseudo headers. */ |
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static inline __sum16 csum_fold(__wsum sum) |
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{ |
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unsigned int tmp; |
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__asm__ __volatile__("addcc\t%0, %1, %1\n\t" |
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"srl\t%1, 16, %1\n\t" |
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"addx\t%1, %%g0, %1\n\t" |
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"xnor\t%%g0, %1, %0" |
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: "=&r" (sum), "=r" (tmp) |
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: "0" (sum), "1" ((__force u32)sum<<16) |
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: "cc"); |
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return (__force __sum16)sum; |
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} |
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static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr, |
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__u32 len, __u8 proto, |
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__wsum sum) |
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{ |
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__asm__ __volatile__("addcc\t%1, %0, %0\n\t" |
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"addxcc\t%2, %0, %0\n\t" |
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"addxcc\t%3, %0, %0\n\t" |
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"addx\t%0, %%g0, %0\n\t" |
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: "=r" (sum), "=r" (saddr) |
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: "r" (daddr), "r" (proto + len), "0" (sum), |
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"1" (saddr) |
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: "cc"); |
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return sum; |
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} |
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/* |
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* computes the checksum of the TCP/UDP pseudo-header |
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* returns a 16-bit checksum, already complemented |
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*/ |
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static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr, |
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__u32 len, __u8 proto, |
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__wsum sum) |
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{ |
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return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum)); |
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} |
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#define _HAVE_ARCH_IPV6_CSUM |
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static inline __sum16 csum_ipv6_magic(const struct in6_addr *saddr, |
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const struct in6_addr *daddr, |
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__u32 len, __u8 proto, __wsum sum) |
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{ |
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__asm__ __volatile__ ( |
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"addcc %3, %4, %%g4\n\t" |
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"addxcc %5, %%g4, %%g4\n\t" |
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"ld [%2 + 0x0c], %%g2\n\t" |
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"ld [%2 + 0x08], %%g3\n\t" |
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"addxcc %%g2, %%g4, %%g4\n\t" |
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"ld [%2 + 0x04], %%g2\n\t" |
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"addxcc %%g3, %%g4, %%g4\n\t" |
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"ld [%2 + 0x00], %%g3\n\t" |
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"addxcc %%g2, %%g4, %%g4\n\t" |
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"ld [%1 + 0x0c], %%g2\n\t" |
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"addxcc %%g3, %%g4, %%g4\n\t" |
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"ld [%1 + 0x08], %%g3\n\t" |
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"addxcc %%g2, %%g4, %%g4\n\t" |
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"ld [%1 + 0x04], %%g2\n\t" |
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"addxcc %%g3, %%g4, %%g4\n\t" |
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"ld [%1 + 0x00], %%g3\n\t" |
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"addxcc %%g2, %%g4, %%g4\n\t" |
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"addxcc %%g3, %%g4, %0\n\t" |
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"addx 0, %0, %0\n" |
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: "=&r" (sum) |
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: "r" (saddr), "r" (daddr), |
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"r"(htonl(len)), "r"(htonl(proto)), "r"(sum) |
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: "g2", "g3", "g4", "cc"); |
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return csum_fold(sum); |
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} |
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/* this routine is used for miscellaneous IP-like checksums, mainly in icmp.c */ |
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static inline __sum16 ip_compute_csum(const void *buff, int len) |
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{ |
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return csum_fold(csum_partial(buff, len, 0)); |
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} |
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#define HAVE_ARCH_CSUM_ADD |
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static inline __wsum csum_add(__wsum csum, __wsum addend) |
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{ |
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__asm__ __volatile__( |
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"addcc %0, %1, %0\n" |
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"addx %0, %%g0, %0" |
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: "=r" (csum) |
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: "r" (addend), "0" (csum)); |
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return csum; |
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} |
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#endif /* !(__SPARC_CHECKSUM_H) */
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