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203 lines
4.9 KiB
203 lines
4.9 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef __ASM_SH_CHECKSUM_H |
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#define __ASM_SH_CHECKSUM_H |
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/* |
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* Copyright (C) 1999 by Kaz Kojima & Niibe Yutaka |
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*/ |
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#include <linux/in6.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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asmlinkage __wsum csum_partial(const void *buff, int len, __wsum sum); |
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/* |
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* the same as csum_partial, but copies from src while it |
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* checksums, and handles user-space pointer exceptions correctly, when needed. |
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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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asmlinkage __wsum csum_partial_copy_generic(const void *src, void *dst, int len); |
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#define _HAVE_ARCH_CSUM_AND_COPY |
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/* |
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* Note: when you get a NULL pointer exception here this means someone |
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* passed in an incorrect kernel address to one of these functions. |
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* |
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* If you use these functions directly please don't forget the |
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* access_ok(). |
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*/ |
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static inline |
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__wsum csum_partial_copy_nocheck(const void *src, void *dst, int len) |
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{ |
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return csum_partial_copy_generic(src, dst, len); |
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} |
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#define _HAVE_ARCH_COPY_AND_CSUM_FROM_USER |
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static inline |
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__wsum csum_and_copy_from_user(const void __user *src, void *dst, int len) |
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{ |
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if (!access_ok(src, len)) |
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return 0; |
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return csum_partial_copy_generic((__force const void *)src, dst, len); |
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} |
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/* |
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* Fold a partial checksum |
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*/ |
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static inline __sum16 csum_fold(__wsum sum) |
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{ |
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unsigned int __dummy; |
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__asm__("swap.w %0, %1\n\t" |
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"extu.w %0, %0\n\t" |
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"extu.w %1, %1\n\t" |
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"add %1, %0\n\t" |
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"swap.w %0, %1\n\t" |
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"add %1, %0\n\t" |
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"not %0, %0\n\t" |
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: "=r" (sum), "=&r" (__dummy) |
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: "0" (sum) |
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: "t"); |
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return (__force __sum16)sum; |
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} |
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/* |
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* This is a version of ip_compute_csum() optimized for IP headers, |
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* which always checksum on 4 octet boundaries. |
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* |
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* i386 version by Jorge Cwik <[email protected]>, adapted |
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* for linux by * Arnt Gulbrandsen. |
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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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__wsum sum; |
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unsigned int __dummy0, __dummy1; |
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__asm__ __volatile__( |
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"mov.l @%1+, %0\n\t" |
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"mov.l @%1+, %3\n\t" |
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"add #-2, %2\n\t" |
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"clrt\n\t" |
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"1:\t" |
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"addc %3, %0\n\t" |
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"movt %4\n\t" |
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"mov.l @%1+, %3\n\t" |
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"dt %2\n\t" |
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"bf/s 1b\n\t" |
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" cmp/eq #1, %4\n\t" |
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"addc %3, %0\n\t" |
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"addc %2, %0" /* Here %2 is 0, add carry-bit */ |
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/* Since the input registers which are loaded with iph and ihl |
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are modified, we must also specify them as outputs, or gcc |
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will assume they contain their original values. */ |
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: "=r" (sum), "=r" (iph), "=r" (ihl), "=&r" (__dummy0), "=&z" (__dummy1) |
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: "1" (iph), "2" (ihl) |
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: "t", "memory"); |
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return csum_fold(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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#ifdef __LITTLE_ENDIAN__ |
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unsigned long len_proto = (proto + len) << 8; |
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#else |
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unsigned long len_proto = proto + len; |
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#endif |
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__asm__("clrt\n\t" |
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"addc %0, %1\n\t" |
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"addc %2, %1\n\t" |
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"addc %3, %1\n\t" |
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"movt %0\n\t" |
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"add %1, %0" |
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: "=r" (sum), "=r" (len_proto) |
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: "r" (daddr), "r" (saddr), "1" (len_proto), "0" (sum) |
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: "t"); |
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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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/* |
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* this routine is used for miscellaneous IP-like checksums, mainly |
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* in icmp.c |
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*/ |
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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_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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unsigned int __dummy; |
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__asm__("clrt\n\t" |
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"mov.l @(0,%2), %1\n\t" |
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"addc %1, %0\n\t" |
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"mov.l @(4,%2), %1\n\t" |
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"addc %1, %0\n\t" |
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"mov.l @(8,%2), %1\n\t" |
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"addc %1, %0\n\t" |
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"mov.l @(12,%2), %1\n\t" |
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"addc %1, %0\n\t" |
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"mov.l @(0,%3), %1\n\t" |
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"addc %1, %0\n\t" |
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"mov.l @(4,%3), %1\n\t" |
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"addc %1, %0\n\t" |
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"mov.l @(8,%3), %1\n\t" |
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"addc %1, %0\n\t" |
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"mov.l @(12,%3), %1\n\t" |
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"addc %1, %0\n\t" |
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"addc %4, %0\n\t" |
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"addc %5, %0\n\t" |
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"movt %1\n\t" |
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"add %1, %0\n" |
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: "=r" (sum), "=&r" (__dummy) |
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: "r" (saddr), "r" (daddr), |
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"r" (htonl(len)), "r" (htonl(proto)), "0" (sum) |
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: "t"); |
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return csum_fold(sum); |
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} |
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/* |
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* Copy and checksum to user |
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*/ |
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#define HAVE_CSUM_COPY_USER |
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static inline __wsum csum_and_copy_to_user(const void *src, |
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void __user *dst, |
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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_generic(src, (__force void *)dst, len); |
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} |
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#endif /* __ASM_SH_CHECKSUM_H */
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