71 lines
1.7 KiB
C
71 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright 2002, 2003 Andi Kleen, SuSE Labs.
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*
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* Wrappers of assembly checksum functions for x86-64.
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*/
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#include <asm/checksum.h>
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#include <linux/export.h>
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#include <linux/uaccess.h>
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#include <asm/smap.h>
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/**
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* csum_and_copy_from_user - Copy and checksum from user space.
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* @src: source address (user space)
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* @dst: destination address
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* @len: number of bytes to be copied.
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*
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* Returns an 32bit unfolded checksum of the buffer.
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* src and dst are best aligned to 64bits.
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*/
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__wsum
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csum_and_copy_from_user(const void __user *src, void *dst, int len)
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{
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__wsum sum;
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might_sleep();
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if (!user_access_begin(src, len))
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return 0;
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sum = csum_partial_copy_generic((__force const void *)src, dst, len);
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user_access_end();
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return sum;
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}
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/**
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* csum_and_copy_to_user - Copy and checksum to user space.
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* @src: source address
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* @dst: destination address (user space)
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* @len: number of bytes to be copied.
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*
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* Returns an 32bit unfolded checksum of the buffer.
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* src and dst are best aligned to 64bits.
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*/
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__wsum
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csum_and_copy_to_user(const void *src, void __user *dst, int len)
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{
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__wsum sum;
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might_sleep();
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if (!user_access_begin(dst, len))
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return 0;
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sum = csum_partial_copy_generic(src, (void __force *)dst, len);
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user_access_end();
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return sum;
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}
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/**
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* csum_partial_copy_nocheck - Copy and checksum.
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* @src: source address
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* @dst: destination address
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* @len: number of bytes to be copied.
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*
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* Returns an 32bit unfolded checksum of the buffer.
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*/
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__wsum
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csum_partial_copy_nocheck(const void *src, void *dst, int len)
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{
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return csum_partial_copy_generic(src, dst, len);
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}
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EXPORT_SYMBOL(csum_partial_copy_nocheck);
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