diff options
Diffstat (limited to 'arch/score/include/asm/checksum.h')
| -rw-r--r-- | arch/score/include/asm/checksum.h | 244 |
1 files changed, 0 insertions, 244 deletions
diff --git a/arch/score/include/asm/checksum.h b/arch/score/include/asm/checksum.h deleted file mode 100644 index 9f00ca5fd49d..000000000000 --- a/arch/score/include/asm/checksum.h +++ /dev/null @@ -1,244 +0,0 @@ -/* 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 */ |