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- #ifndef _XTENSA_CHECKSUM_H
- #define _XTENSA_CHECKSUM_H
- #include <linux/in6.h>
- #include <asm/uaccess.h>
- #include <variant/core.h>
- asmlinkage __wsum csum_partial(const void *buff, int len, __wsum sum);
- asmlinkage __wsum csum_partial_copy_generic(const void *src, void *dst,
- int len, __wsum sum,
- int *src_err_ptr, int *dst_err_ptr);
- static inline
- __wsum csum_partial_copy_nocheck(const void *src, void *dst,
- int len, __wsum sum)
- {
- return csum_partial_copy_generic(src, dst, len, sum, NULL, NULL);
- }
- static inline
- __wsum csum_partial_copy_from_user(const void __user *src, void *dst,
- int len, __wsum sum, int *err_ptr)
- {
- return csum_partial_copy_generic((__force const void *)src, dst,
- len, sum, err_ptr, NULL);
- }
- static __inline__ __sum16 csum_fold(__wsum sum)
- {
- unsigned int __dummy;
- __asm__("extui %1, %0, 16, 16\n\t"
- "extui %0 ,%0, 0, 16\n\t"
- "add %0, %0, %1\n\t"
- "slli %1, %0, 16\n\t"
- "add %0, %0, %1\n\t"
- "extui %0, %0, 16, 16\n\t"
- "neg %0, %0\n\t"
- "addi %0, %0, -1\n\t"
- "extui %0, %0, 0, 16\n\t"
- : "=r" (sum), "=&r" (__dummy)
- : "0" (sum));
- return (__force __sum16)sum;
- }
- static __inline__ __sum16 ip_fast_csum(const void *iph, unsigned int ihl)
- {
- unsigned int sum, tmp, endaddr;
- __asm__ __volatile__(
- "sub %0, %0, %0\n\t"
- #if XCHAL_HAVE_LOOPS
- "loopgtz %2, 2f\n\t"
- #else
- "beqz %2, 2f\n\t"
- "slli %4, %2, 2\n\t"
- "add %4, %4, %1\n\t"
- "0:\t"
- #endif
- "l32i %3, %1, 0\n\t"
- "add %0, %0, %3\n\t"
- "bgeu %0, %3, 1f\n\t"
- "addi %0, %0, 1\n\t"
- "1:\t"
- "addi %1, %1, 4\n\t"
- #if !XCHAL_HAVE_LOOPS
- "blt %1, %4, 0b\n\t"
- #endif
- "2:\t"
-
- : "=r" (sum), "=r" (iph), "=r" (ihl), "=&r" (tmp),
- "=&r" (endaddr)
- : "1" (iph), "2" (ihl)
- : "memory");
- return csum_fold(sum);
- }
- static __inline__ __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
- __u32 len, __u8 proto,
- __wsum sum)
- {
- #ifdef __XTENSA_EL__
- unsigned long len_proto = (len + proto) << 8;
- #elif defined(__XTENSA_EB__)
- unsigned long len_proto = len + proto;
- #else
- # error processor byte order undefined!
- #endif
- __asm__("add %0, %0, %1\n\t"
- "bgeu %0, %1, 1f\n\t"
- "addi %0, %0, 1\n\t"
- "1:\t"
- "add %0, %0, %2\n\t"
- "bgeu %0, %2, 1f\n\t"
- "addi %0, %0, 1\n\t"
- "1:\t"
- "add %0, %0, %3\n\t"
- "bgeu %0, %3, 1f\n\t"
- "addi %0, %0, 1\n\t"
- "1:\t"
- : "=r" (sum), "=r" (len_proto)
- : "r" (daddr), "r" (saddr), "1" (len_proto), "0" (sum));
- return sum;
- }
- 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));
- }
- static __inline__ __sum16 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)
- {
- unsigned int __dummy;
- __asm__("l32i %1, %2, 0\n\t"
- "add %0, %0, %1\n\t"
- "bgeu %0, %1, 1f\n\t"
- "addi %0, %0, 1\n\t"
- "1:\t"
- "l32i %1, %2, 4\n\t"
- "add %0, %0, %1\n\t"
- "bgeu %0, %1, 1f\n\t"
- "addi %0, %0, 1\n\t"
- "1:\t"
- "l32i %1, %2, 8\n\t"
- "add %0, %0, %1\n\t"
- "bgeu %0, %1, 1f\n\t"
- "addi %0, %0, 1\n\t"
- "1:\t"
- "l32i %1, %2, 12\n\t"
- "add %0, %0, %1\n\t"
- "bgeu %0, %1, 1f\n\t"
- "addi %0, %0, 1\n\t"
- "1:\t"
- "l32i %1, %3, 0\n\t"
- "add %0, %0, %1\n\t"
- "bgeu %0, %1, 1f\n\t"
- "addi %0, %0, 1\n\t"
- "1:\t"
- "l32i %1, %3, 4\n\t"
- "add %0, %0, %1\n\t"
- "bgeu %0, %1, 1f\n\t"
- "addi %0, %0, 1\n\t"
- "1:\t"
- "l32i %1, %3, 8\n\t"
- "add %0, %0, %1\n\t"
- "bgeu %0, %1, 1f\n\t"
- "addi %0, %0, 1\n\t"
- "1:\t"
- "l32i %1, %3, 12\n\t"
- "add %0, %0, %1\n\t"
- "bgeu %0, %1, 1f\n\t"
- "addi %0, %0, 1\n\t"
- "1:\t"
- "add %0, %0, %4\n\t"
- "bgeu %0, %4, 1f\n\t"
- "addi %0, %0, 1\n\t"
- "1:\t"
- "add %0, %0, %5\n\t"
- "bgeu %0, %5, 1f\n\t"
- "addi %0, %0, 1\n\t"
- "1:\t"
- : "=r" (sum), "=&r" (__dummy)
- : "r" (saddr), "r" (daddr),
- "r" (htonl(len)), "r" (htonl(proto)), "0" (sum)
- : "memory");
- return csum_fold(sum);
- }
- #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)
- {
- if (access_ok(VERIFY_WRITE, dst, len))
- return csum_partial_copy_generic(src,dst,len,sum,NULL,err_ptr);
- if (len)
- *err_ptr = -EFAULT;
- return (__force __wsum)-1;
- }
- #endif
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