/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _ASM_SCORE_CHECKSUM_H #define _ASM_SCORE_CHECKSUM_H #include <linux/in6.h> #include <linux/uaccess.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 */ unsigned int csum_partial(const void *buff, int len, __wsum sum); unsigned int csum_partial_copy_from_user(const char *src, char *dst, int len, unsigned int sum, int *csum_err); unsigned int csum_partial_copy(const char *src, char *dst, int len, unsigned int sum); /* * this is a new version of the above that records errors it finds in *errp, * but continues and zeros the rest of the buffer. */ /* * 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) { sum = csum_partial(src, len, sum); if (copy_to_user(dst, src, len)) { *err_ptr = -EFAULT; return (__force __wsum) -1; /* invalid checksum */ } return sum; } #define csum_partial_copy_nocheck csum_partial_copy /* * Fold a partial checksum without adding pseudo headers */ static inline __sum16 csum_fold(__wsum sum) { /* the while loop is unnecessary really, it's always enough with two iterations */ __asm__ __volatile__( ".set volatile\n\t" ".set\tr1\n\t" "slli\tr1,%0, 16\n\t" "add\t%0,%0, r1\n\t" "cmp.c\tr1, %0\n\t" "srli\t%0, %0, 16\n\t" "bleu\t1f\n\t" "addi\t%0, 0x1\n\t" "1:ldi\tr30, 0xffff\n\t" "xor\t%0, %0, r30\n\t" "slli\t%0, %0, 16\n\t" "srli\t%0, %0, 16\n\t" ".set\tnor1\n\t" ".set optimize\n\t" : "=r" (sum) : "0" (sum)); return sum; } /* * This is a version of ip_compute_csum() optimized for IP headers, * which always checksum on 4 octet boundaries. * * By Jorge Cwik <jorge@laser.satlink.net>, adapted for linux by * Arnt Gulbrandsen. */ static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl) { unsigned int sum; unsigned long dummy; __asm__ __volatile__( ".set volatile\n\t" ".set\tnor1\n\t" "lw\t%0, [%1]\n\t" "subri\t%2, %2, 4\n\t" "slli\t%2, %2, 2\n\t" "lw\t%3, [%1, 4]\n\t" "add\t%2, %2, %1\n\t" "add\t%0, %0, %3\n\t" "cmp.c\t%3, %0\n\t" "lw\t%3, [%1, 8]\n\t" "bleu\t1f\n\t" "addi\t%0, 0x1\n\t" "1:\n\t" "add\t%0, %0, %3\n\t" "cmp.c\t%3, %0\n\t" "lw\t%3, [%1, 12]\n\t" "bleu\t1f\n\t" "addi\t%0, 0x1\n\t" "1:add\t%0, %0, %3\n\t" "cmp.c\t%3, %0\n\t" "bleu\t1f\n\t" "addi\t%0, 0x1\n" "1:\tlw\t%3, [%1, 16]\n\t" "addi\t%1, 4\n\t" "add\t%0, %0, %3\n\t" "cmp.c\t%3, %0\n\t" "bleu\t2f\n\t" "addi\t%0, 0x1\n" "2:cmp.c\t%2, %1\n\t" "bne\t1b\n\t" ".set\tr1\n\t" ".set optimize\n\t" : "=&r" (sum), "=&r" (iph), "=&r" (ihl), "=&r" (dummy) : "1" (iph), "2" (ihl)); return csum_fold(sum); } static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr, __u32 len, __u8 proto, __wsum sum) { unsigned long tmp = (len + proto) << 8; __asm__ __volatile__( ".set volatile\n\t" "add\t%0, %0, %2\n\t" "cmp.c\t%2, %0\n\t" "bleu\t1f\n\t" "addi\t%0, 0x1\n\t" "1:\n\t" "add\t%0, %0, %3\n\t" "cmp.c\t%3, %0\n\t" "bleu\t1f\n\t" "addi\t%0, 0x1\n\t" "1:\n\t" "add\t%0, %0, %4\n\t" "cmp.c\t%4, %0\n\t" "bleu\t1f\n\t" "addi\t%0, 0x1\n\t" "1:\n\t" ".set optimize\n\t" : "=r" (sum) : "0" (daddr), "r"(saddr), "r" (tmp), "r" (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 unsigned short ip_compute_csum(const void *buff, int len) { return csum_fold(csum_partial(buff, 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__( ".set\tvolatile\t\t\t# csum_ipv6_magic\n\t" "add\t%0, %0, %5\t\t\t# proto (long in network byte order)\n\t" "cmp.c\t%5, %0\n\t" "bleu 1f\n\t" "addi\t%0, 0x1\n\t" "1:add\t%0, %0, %6\t\t\t# csum\n\t" "cmp.c\t%6, %0\n\t" "lw\t%1, [%2, 0]\t\t\t# four words source address\n\t" "bleu 1f\n\t" "addi\t%0, 0x1\n\t" "1:add\t%0, %0, %1\n\t" "cmp.c\t%1, %0\n\t" "1:lw\t%1, [%2, 4]\n\t" "bleu 1f\n\t" "addi\t%0, 0x1\n\t" "1:add\t%0, %0, %1\n\t" "cmp.c\t%1, %0\n\t" "lw\t%1, [%2,8]\n\t" "bleu 1f\n\t" "addi\t%0, 0x1\n\t" "1:add\t%0, %0, %1\n\t" "cmp.c\t%1, %0\n\t" "lw\t%1, [%2, 12]\n\t" "bleu 1f\n\t" "addi\t%0, 0x1\n\t" "1:add\t%0, %0,%1\n\t" "cmp.c\t%1, %0\n\t" "lw\t%1, [%3, 0]\n\t" "bleu 1f\n\t" "addi\t%0, 0x1\n\t" "1:add\t%0, %0, %1\n\t" "cmp.c\t%1, %0\n\t" "lw\t%1, [%3, 4]\n\t" "bleu 1f\n\t" "addi\t%0, 0x1\n\t" "1:add\t%0, %0, %1\n\t" "cmp.c\t%1, %0\n\t" "lw\t%1, [%3, 8]\n\t" "bleu 1f\n\t" "addi\t%0, 0x1\n\t" "1:add\t%0, %0, %1\n\t" "cmp.c\t%1, %0\n\t" "lw\t%1, [%3, 12]\n\t" "bleu 1f\n\t" "addi\t%0, 0x1\n\t" "1:add\t%0, %0, %1\n\t" "cmp.c\t%1, %0\n\t" "bleu 1f\n\t" "addi\t%0, 0x1\n\t" "1:\n\t" ".set\toptimize" : "=r" (sum), "=r" (proto) : "r" (saddr), "r" (daddr), "0" (htonl(len)), "1" (htonl(proto)), "r" (sum)); return csum_fold(sum); } #endif /* _ASM_SCORE_CHECKSUM_H */
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Kbuild | File | 340 B | 0644 |
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asm-offsets.h | File | 35 B | 0644 |
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asmmacro.h | File | 2.48 KB | 0644 |
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atomic.h | File | 187 B | 0644 |
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bitops.h | File | 266 B | 0644 |
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bug.h | File | 578 B | 0644 |
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bugs.h | File | 154 B | 0644 |
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cache.h | File | 199 B | 0644 |
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cacheflush.h | File | 1.63 KB | 0644 |
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checksum.h | File | 5.61 KB | 0644 |
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cmpxchg.h | File | 1.02 KB | 0644 |
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delay.h | File | 567 B | 0644 |
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device.h | File | 162 B | 0644 |
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div64.h | File | 158 B | 0644 |
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dma.h | File | 171 B | 0644 |
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elf.h | File | 2.84 KB | 0644 |
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emergency-restart.h | File | 206 B | 0644 |
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exec.h | File | 181 B | 0644 |
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fixmap.h | File | 2.38 KB | 0644 |
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ftrace.h | File | 90 B | 0644 |
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futex.h | File | 158 B | 0644 |
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hardirq.h | File | 166 B | 0644 |
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hw_irq.h | File | 90 B | 0644 |
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io.h | File | 212 B | 0644 |
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irq.h | File | 794 B | 0644 |
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irq_regs.h | File | 258 B | 0644 |
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irqflags.h | File | 1.9 KB | 0644 |
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kdebug.h | File | 162 B | 0644 |
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kmap_types.h | File | 178 B | 0644 |
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linkage.h | File | 189 B | 0644 |
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local.h | File | 158 B | 0644 |
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local64.h | File | 33 B | 0644 |
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mmu.h | File | 157 B | 0644 |
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mmu_context.h | File | 2.68 KB | 0644 |
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module.h | File | 949 B | 0644 |
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page.h | File | 2.84 KB | 0644 |
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pci.h | File | 81 B | 0644 |
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percpu.h | File | 162 B | 0644 |
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pgalloc.h | File | 1.81 KB | 0644 |
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pgtable-bits.h | File | 990 B | 0644 |
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pgtable.h | File | 7.29 KB | 0644 |
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processor.h | File | 2.39 KB | 0644 |
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ptrace.h | File | 749 B | 0644 |
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scoreregs.h | File | 1.4 KB | 0644 |
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segment.h | File | 513 B | 0644 |
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setup.h | File | 1.01 KB | 0644 |
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shmparam.h | File | 170 B | 0644 |
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string.h | File | 327 B | 0644 |
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switch_to.h | File | 323 B | 0644 |
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syscalls.h | File | 229 B | 0644 |
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thread_info.h | File | 2.55 KB | 0644 |
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timex.h | File | 216 B | 0644 |
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tlb.h | File | 538 B | 0644 |
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tlbflush.h | File | 3.02 KB | 0644 |
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topology.h | File | 170 B | 0644 |
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uaccess.h | File | 10.78 KB | 0644 |
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ucontext.h | File | 34 B | 0644 |
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unaligned.h | File | 174 B | 0644 |
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user.h | File | 437 B | 0644 |
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