Release 4.11 arch/x86/um/asm/checksum_32.h

/*
 * Licensed under the GPL
 */

#ifndef __UM_SYSDEP_CHECKSUM_H

#define __UM_SYSDEP_CHECKSUM_H



static inline __sum16 ip_compute_csum(const void *buff, int len)
{
    return csum_fold (csum_partial(buff, len, 0));
}

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#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__(
                "addl 0(%1), %0         ;\n"
                "adcl 4(%1), %0         ;\n"
                "adcl 8(%1), %0         ;\n"
                "adcl 12(%1), %0        ;\n"
                "adcl 0(%2), %0         ;\n"
                "adcl 4(%2), %0         ;\n"
                "adcl 8(%2), %0         ;\n"
                "adcl 12(%2), %0        ;\n"
                "adcl %3, %0            ;\n"
                "adcl %4, %0            ;\n"
                "adcl $0, %0            ;\n"
                : "=&r" (sum)
                : "r" (saddr), "r" (daddr),
                  "r"(htonl(len)), "r"(htonl(proto)), "0"(sum));

	return csum_fold(sum);
}

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Alexander Duyck
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/*
 *      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)
{
	if (access_ok(VERIFY_WRITE, dst, len)) {
		if (copy_to_user(dst, src, len)) {
			*err_ptr = -EFAULT;
			return (__force __wsum)-1;
		}

		return csum_partial(src, len, sum);
	}

	if (len)
		*err_ptr = -EFAULT;

	return (__force __wsum)-1; /* invalid checksum */
}

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25.00%
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#endif
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16.67%
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Alexander Duyck
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Directory: arch/x86/um/asm

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