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98 lines
2.3 KiB
98 lines
2.3 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) |
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* |
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* Joern Rennecke <[email protected]>: Jan 2012 |
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* -Insn Scheduling improvements to csum core routines. |
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* = csum_fold( ) largely derived from ARM version. |
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* = ip_fast_cum( ) to have module scheduling |
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* -gcc 4.4.x broke networking. Alias analysis needed to be primed. |
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* worked around by adding memory clobber to ip_fast_csum( ) |
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* |
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* vineetg: May 2010 |
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* -Rewrote ip_fast_cscum( ) and csum_fold( ) with fast inline asm |
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*/ |
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#ifndef _ASM_ARC_CHECKSUM_H |
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#define _ASM_ARC_CHECKSUM_H |
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/* |
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* Fold a partial checksum |
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* |
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* The 2 swords comprising the 32bit sum are added, any carry to 16th bit |
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* added back and final sword result inverted. |
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*/ |
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static inline __sum16 csum_fold(__wsum s) |
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{ |
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unsigned r = s << 16 | s >> 16; /* ror */ |
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s = ~s; |
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s -= r; |
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return s >> 16; |
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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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static inline __sum16 |
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ip_fast_csum(const void *iph, unsigned int ihl) |
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{ |
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const void *ptr = iph; |
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unsigned int tmp, tmp2, sum; |
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__asm__( |
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" ld.ab %0, [%3, 4] \n" |
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" ld.ab %2, [%3, 4] \n" |
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" sub %1, %4, 2 \n" |
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" lsr.f lp_count, %1, 1 \n" |
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" bcc 0f \n" |
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" add.f %0, %0, %2 \n" |
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" ld.ab %2, [%3, 4] \n" |
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"0: lp 1f \n" |
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" ld.ab %1, [%3, 4] \n" |
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" adc.f %0, %0, %2 \n" |
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" ld.ab %2, [%3, 4] \n" |
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" adc.f %0, %0, %1 \n" |
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"1: adc.f %0, %0, %2 \n" |
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" add.cs %0,%0,1 \n" |
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: "=&r"(sum), "=r"(tmp), "=&r"(tmp2), "+&r" (ptr) |
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: "r"(ihl) |
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: "cc", "lp_count", "memory"); |
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return csum_fold(sum); |
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} |
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/* |
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* TCP pseudo Header is 12 bytes: |
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* SA [4], DA [4], zeroes [1], Proto[1], TCP Seg(hdr+data) Len [2] |
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*/ |
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static inline __wsum |
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csum_tcpudp_nofold(__be32 saddr, __be32 daddr, __u32 len, |
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__u8 proto, __wsum sum) |
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{ |
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__asm__ __volatile__( |
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" add.f %0, %0, %1 \n" |
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" adc.f %0, %0, %2 \n" |
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" adc.f %0, %0, %3 \n" |
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" adc.f %0, %0, %4 \n" |
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" adc %0, %0, 0 \n" |
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: "+&r"(sum) |
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: "r"(saddr), "r"(daddr), |
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#ifdef CONFIG_CPU_BIG_ENDIAN |
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"r"(len), |
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#else |
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"r"(len << 8), |
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#endif |
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"r"(htons(proto)) |
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: "cc"); |
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return sum; |
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} |
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#define csum_fold csum_fold |
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#define ip_fast_csum ip_fast_csum |
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#define csum_tcpudp_nofold csum_tcpudp_nofold |
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#include <asm-generic/checksum.h> |
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#endif /* _ASM_ARC_CHECKSUM_H */
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