/* * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * Joern Rennecke <joern.rennecke@embecosm.com>: Jan 2012 * -Insn Scheduling improvements to csum core routines. * = csum_fold( ) largely derived from ARM version. * = ip_fast_cum( ) to have module scheduling * -gcc 4.4.x broke networking. Alias analysis needed to be primed. * worked around by adding memory clobber to ip_fast_csum( ) * * vineetg: May 2010 * -Rewrote ip_fast_cscum( ) and csum_fold( ) with fast inline asm */ #ifndef _ASM_ARC_CHECKSUM_H #define _ASM_ARC_CHECKSUM_H /* * Fold a partial checksum * * The 2 swords comprising the 32bit sum are added, any carry to 16th bit * added back and final sword result inverted. */ static inline __sum16 csum_fold(__wsum s) { unsigned r = s << 16 | s >> 16; /* ror */ s = ~s; s -= r; return s >> 16; } /* * This is a version of ip_compute_csum() optimized for IP headers, * which always checksum on 4 octet boundaries. */ static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl) { const void *ptr = iph; unsigned int tmp, tmp2, sum; __asm__( " ld.ab %0, [%3, 4] \n" " ld.ab %2, [%3, 4] \n" " sub %1, %4, 2 \n" " lsr.f lp_count, %1, 1 \n" " bcc 0f \n" " add.f %0, %0, %2 \n" " ld.ab %2, [%3, 4] \n" "0: lp 1f \n" " ld.ab %1, [%3, 4] \n" " adc.f %0, %0, %2 \n" " ld.ab %2, [%3, 4] \n" " adc.f %0, %0, %1 \n" "1: adc.f %0, %0, %2 \n" " add.cs %0,%0,1 \n" : "=&r"(sum), "=r"(tmp), "=&r"(tmp2), "+&r" (ptr) : "r"(ihl) : "cc", "lp_count", "memory"); return csum_fold(sum); } /* * TCP pseudo Header is 12 bytes: * SA [4], DA [4], zeroes [1], Proto[1], TCP Seg(hdr+data) Len [2] */ static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr, __u32 len, __u8 proto, __wsum sum) { __asm__ __volatile__( " add.f %0, %0, %1 \n" " adc.f %0, %0, %2 \n" " adc.f %0, %0, %3 \n" " adc.f %0, %0, %4 \n" " adc %0, %0, 0 \n" : "+&r"(sum) : "r"(saddr), "r"(daddr), #ifdef CONFIG_CPU_BIG_ENDIAN "r"(len), #else "r"(len << 8), #endif "r"(htons(proto)) : "cc"); return sum; } #define csum_fold csum_fold #define ip_fast_csum ip_fast_csum #define csum_tcpudp_nofold csum_tcpudp_nofold #include <asm-generic/checksum.h> #endif /* _ASM_ARC_CHECKSUM_H */
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Kbuild | File | 681 B | 0644 |
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arcregs.h | File | 8.59 KB | 0644 |
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asm-offsets.h | File | 311 B | 0644 |
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atomic.h | File | 15.14 KB | 0644 |
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barrier.h | File | 1.75 KB | 0644 |
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bitops.h | File | 9.81 KB | 0644 |
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bug.h | File | 938 B | 0644 |
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cache.h | File | 3.77 KB | 0644 |
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cacheflush.h | File | 3.88 KB | 0644 |
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checksum.h | File | 2.45 KB | 0644 |
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cmpxchg.h | File | 5.4 KB | 0644 |
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current.h | File | 695 B | 0644 |
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delay.h | File | 1.99 KB | 0644 |
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disasm.h | File | 3.87 KB | 0644 |
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dma-mapping.h | File | 734 B | 0644 |
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dma.h | File | 459 B | 0644 |
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dwarf.h | File | 892 B | 0644 |
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elf.h | File | 2.15 KB | 0644 |
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entry-arcv2.h | File | 4.85 KB | 0644 |
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entry-compact.h | File | 9.29 KB | 0644 |
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entry.h | File | 6.73 KB | 0644 |
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exec.h | File | 410 B | 0644 |
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fb.h | File | 411 B | 0644 |
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futex.h | File | 3.67 KB | 0644 |
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highmem.h | File | 1.46 KB | 0644 |
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hugepage.h | File | 2.41 KB | 0644 |
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io.h | File | 6.42 KB | 0644 |
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irq.h | File | 825 B | 0644 |
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irqflags-arcv2.h | File | 3.45 KB | 0644 |
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irqflags-compact.h | File | 4.25 KB | 0644 |
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irqflags.h | File | 509 B | 0644 |
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kdebug.h | File | 400 B | 0644 |
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kgdb.h | File | 1.35 KB | 0644 |
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kmap_types.h | File | 489 B | 0644 |
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kprobes.h | File | 1.37 KB | 0644 |
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linkage.h | File | 1.42 KB | 0644 |
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mach_desc.h | File | 2.06 KB | 0644 |
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mmu.h | File | 2.44 KB | 0644 |
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mmu_context.h | File | 5.67 KB | 0644 |
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mmzone.h | File | 989 B | 0644 |
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module.h | File | 661 B | 0644 |
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page.h | File | 2.99 KB | 0644 |
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pci.h | File | 705 B | 0644 |
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perf_event.h | File | 6.86 KB | 0644 |
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pgalloc.h | File | 3.79 KB | 0644 |
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pgtable.h | File | 14.2 KB | 0644 |
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processor.h | File | 4.69 KB | 0644 |
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ptrace.h | File | 3.87 KB | 0644 |
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sections.h | File | 407 B | 0644 |
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segment.h | File | 612 B | 0644 |
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serial.h | File | 644 B | 0644 |
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setup.h | File | 1.18 KB | 0644 |
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shmparam.h | File | 442 B | 0644 |
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smp.h | File | 4.25 KB | 0644 |
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spinlock.h | File | 8.79 KB | 0644 |
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spinlock_types.h | File | 1.03 KB | 0644 |
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stacktrace.h | File | 1.29 KB | 0644 |
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string.h | File | 1.15 KB | 0644 |
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switch_to.h | File | 1.17 KB | 0644 |
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syscall.h | File | 1.57 KB | 0644 |
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syscalls.h | File | 653 B | 0644 |
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thread_info.h | File | 3.39 KB | 0644 |
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timex.h | File | 508 B | 0644 |
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tlb-mmu1.h | File | 3.48 KB | 0644 |
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tlb.h | File | 1.23 KB | 0644 |
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tlbflush.h | File | 1.76 KB | 0644 |
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uaccess.h | File | 18.45 KB | 0644 |
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unaligned.h | File | 771 B | 0644 |
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unwind.h | File | 3.51 KB | 0644 |
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