6bc9a3966f
This is the complete set of new arch Score's files for linux. Score instruction set support 16bits, 32bits and 64bits instruction, Score SOC had been used in game machine and LCD TV. Signed-off-by: Chen Liqin <liqin.chen@sunplusct.com> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
236 lines
5.5 KiB
C
236 lines
5.5 KiB
C
#ifndef _ASM_SCORE_CHECKSUM_H
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#define _ASM_SCORE_CHECKSUM_H
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#include <linux/in6.h>
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#include <asm/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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unsigned int csum_partial(const void *buff, int len, __wsum sum);
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unsigned int csum_partial_copy_from_user(const char *src, char *dst, int len,
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unsigned int sum, int *csum_err);
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unsigned int csum_partial_copy(const char *src, char *dst,
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int len, unsigned int sum);
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/*
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* this is a new version of the above that records errors it finds in *errp,
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* but continues and zeros the rest of the buffer.
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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
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__wsum csum_and_copy_to_user(const void *src, void __user *dst, int len,
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__wsum sum, int *err_ptr)
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{
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sum = csum_partial(src, len, sum);
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if (copy_to_user(dst, src, len)) {
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*err_ptr = -EFAULT;
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return (__force __wsum) -1; /* invalid checksum */
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}
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return sum;
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}
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#define csum_partial_copy_nocheck csum_partial_copy
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/*
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* Fold a partial checksum without adding pseudo headers
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*/
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static inline __sum16 csum_fold(__wsum sum)
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{
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/* the while loop is unnecessary really, it's always enough with two
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iterations */
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__asm__ __volatile__(
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".set volatile\n\t"
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".set\tr1\n\t"
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"slli\tr1,%0, 16\n\t"
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"add\t%0,%0, r1\n\t"
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"cmp.c\tr1, %0\n\t"
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"srli\t%0, %0, 16\n\t"
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"bleu\t1f\n\t"
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"addi\t%0, 0x1\n\t"
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"1:ldi\tr30, 0xffff\n\t"
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"xor\t%0, %0, r30\n\t"
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"slli\t%0, %0, 16\n\t"
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"srli\t%0, %0, 16\n\t"
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".set\tnor1\n\t"
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".set optimize\n\t"
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: "=r" (sum)
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: "0" (sum));
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return 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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* By Jorge Cwik <jorge@laser.satlink.net>, adapted for linux by
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* 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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unsigned int sum;
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unsigned long dummy;
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__asm__ __volatile__(
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".set volatile\n\t"
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".set\tnor1\n\t"
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"lw\t%0, [%1]\n\t"
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"subri\t%2, %2, 4\n\t"
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"slli\t%2, %2, 2\n\t"
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"lw\t%3, [%1, 4]\n\t"
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"add\t%2, %2, %1\n\t"
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"add\t%0, %0, %3\n\t"
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"cmp.c\t%3, %0\n\t"
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"lw\t%3, [%1, 8]\n\t"
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"bleu\t1f\n\t"
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"addi\t%0, 0x1\n\t"
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"1:\n\t"
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"add\t%0, %0, %3\n\t"
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"cmp.c\t%3, %0\n\t"
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"lw\t%3, [%1, 12]\n\t"
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"bleu\t1f\n\t"
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"addi\t%0, 0x1\n\t"
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"1:add\t%0, %0, %3\n\t"
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"cmp.c\t%3, %0\n\t"
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"bleu\t1f\n\t"
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"addi\t%0, 0x1\n"
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"1:\tlw\t%3, [%1, 16]\n\t"
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"addi\t%1, 4\n\t"
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"add\t%0, %0, %3\n\t"
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"cmp.c\t%3, %0\n\t"
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"bleu\t2f\n\t"
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"addi\t%0, 0x1\n"
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"2:cmp.c\t%2, %1\n\t"
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"bne\t1b\n\t"
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".set\tr1\n\t"
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".set optimize\n\t"
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: "=&r" (sum), "=&r" (iph), "=&r" (ihl), "=&r" (dummy)
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: "1" (iph), "2" (ihl));
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return csum_fold(sum);
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}
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static inline __wsum
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csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len,
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unsigned short proto, __wsum sum)
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{
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unsigned long tmp = (ntohs(len) << 16) + proto * 256;
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__asm__ __volatile__(
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".set volatile\n\t"
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"add\t%0, %0, %2\n\t"
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"cmp.c\t%2, %0\n\t"
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"bleu\t1f\n\t"
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"addi\t%0, 0x1\n\t"
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"1:\n\t"
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"add\t%0, %0, %3\n\t"
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"cmp.c\t%3, %0\n\t"
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"bleu\t1f\n\t"
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"addi\t%0, 0x1\n\t"
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"1:\n\t"
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"add\t%0, %0, %4\n\t"
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"cmp.c\t%4, %0\n\t"
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"bleu\t1f\n\t"
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"addi\t%0, 0x1\n\t"
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"1:\n\t"
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".set optimize\n\t"
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: "=r" (sum)
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: "0" (daddr), "r"(saddr),
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"r" (tmp),
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"r" (sum));
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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
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csum_tcpudp_magic(__be32 saddr, __be32 daddr, unsigned short len,
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unsigned short proto, __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 unsigned short 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, unsigned short proto,
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__wsum sum)
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{
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__asm__ __volatile__(
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".set\tnoreorder\t\t\t# csum_ipv6_magic\n\t"
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".set\tnoat\n\t"
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"addu\t%0, %5\t\t\t# proto (long in network byte order)\n\t"
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"sltu\t$1, %0, %5\n\t"
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"addu\t%0, $1\n\t"
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"addu\t%0, %6\t\t\t# csum\n\t"
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"sltu\t$1, %0, %6\n\t"
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"lw\t%1, 0(%2)\t\t\t# four words source address\n\t"
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"addu\t%0, $1\n\t"
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"addu\t%0, %1\n\t"
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"sltu\t$1, %0, %1\n\t"
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"lw\t%1, 4(%2)\n\t"
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"addu\t%0, $1\n\t"
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"addu\t%0, %1\n\t"
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"sltu\t$1, %0, %1\n\t"
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"lw\t%1, 8(%2)\n\t"
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"addu\t%0, $1\n\t"
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"addu\t%0, %1\n\t"
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"sltu\t$1, %0, %1\n\t"
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"lw\t%1, 12(%2)\n\t"
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"addu\t%0, $1\n\t"
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"addu\t%0, %1\n\t"
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"sltu\t$1, %0, %1\n\t"
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"lw\t%1, 0(%3)\n\t"
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"addu\t%0, $1\n\t"
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"addu\t%0, %1\n\t"
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"sltu\t$1, %0, %1\n\t"
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"lw\t%1, 4(%3)\n\t"
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"addu\t%0, $1\n\t"
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"addu\t%0, %1\n\t"
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"sltu\t$1, %0, %1\n\t"
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"lw\t%1, 8(%3)\n\t"
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"addu\t%0, $1\n\t"
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"addu\t%0, %1\n\t"
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"sltu\t$1, %0, %1\n\t"
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"lw\t%1, 12(%3)\n\t"
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"addu\t%0, $1\n\t"
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"addu\t%0, %1\n\t"
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"sltu\t$1, %0, %1\n\t"
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"addu\t%0, $1\t\t\t# Add final carry\n\t"
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".set\tnoat\n\t"
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".set\tnoreorder"
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: "=r" (sum), "=r" (proto)
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: "r" (saddr), "r" (daddr),
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"0" (htonl(len)), "1" (htonl(proto)), "r" (sum));
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return csum_fold(sum);
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}
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#endif /* _ASM_SCORE_CHECKSUM_H */
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