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Diffstat (limited to 'include/asm-x86_64/checksum.h')
| -rw-r--r-- | include/asm-x86_64/checksum.h | 195 |
1 files changed, 0 insertions, 195 deletions
diff --git a/include/asm-x86_64/checksum.h b/include/asm-x86_64/checksum.h deleted file mode 100644 index 419fe88a0342..000000000000 --- a/include/asm-x86_64/checksum.h +++ /dev/null @@ -1,195 +0,0 @@ -#ifndef _X86_64_CHECKSUM_H -#define _X86_64_CHECKSUM_H - -/* - * Checksums for x86-64 - * Copyright 2002 by Andi Kleen, SuSE Labs - * with some code from asm-i386/checksum.h - */ - -#include <linux/compiler.h> -#include <asm/uaccess.h> -#include <asm/byteorder.h> - -/** - * csum_fold - Fold and invert a 32bit checksum. - * sum: 32bit unfolded sum - * - * Fold a 32bit running checksum to 16bit and invert it. This is usually - * the last step before putting a checksum into a packet. - * Make sure not to mix with 64bit checksums. - */ -static inline __sum16 csum_fold(__wsum sum) -{ - __asm__( - " addl %1,%0\n" - " adcl $0xffff,%0" - : "=r" (sum) - : "r" ((__force u32)sum << 16), - "0" ((__force u32)sum & 0xffff0000) - ); - return (__force __sum16)(~(__force u32)sum >> 16); -} - -/* - * 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. - */ - -/** - * ip_fast_csum - Compute the IPv4 header checksum efficiently. - * iph: ipv4 header - * ihl: length of header / 4 - */ -static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl) -{ - unsigned int sum; - - asm( " movl (%1), %0\n" - " subl $4, %2\n" - " jbe 2f\n" - " addl 4(%1), %0\n" - " adcl 8(%1), %0\n" - " adcl 12(%1), %0\n" - "1: adcl 16(%1), %0\n" - " lea 4(%1), %1\n" - " decl %2\n" - " jne 1b\n" - " adcl $0, %0\n" - " movl %0, %2\n" - " shrl $16, %0\n" - " addw %w2, %w0\n" - " adcl $0, %0\n" - " notl %0\n" - "2:" - /* Since the input registers which are loaded with iph and ihl - are modified, we must also specify them as outputs, or gcc - will assume they contain their original values. */ - : "=r" (sum), "=r" (iph), "=r" (ihl) - : "1" (iph), "2" (ihl) - : "memory"); - return (__force __sum16)sum; -} - -/** - * csum_tcpup_nofold - Compute an IPv4 pseudo header checksum. - * @saddr: source address - * @daddr: destination address - * @len: length of packet - * @proto: ip protocol of packet - * @sum: initial sum to be added in (32bit unfolded) - * - * Returns the pseudo header checksum the input data. Result is - * 32bit unfolded. - */ -static inline __wsum -csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len, - unsigned short proto, __wsum sum) -{ - asm(" addl %1, %0\n" - " adcl %2, %0\n" - " adcl %3, %0\n" - " adcl $0, %0\n" - : "=r" (sum) - : "g" (daddr), "g" (saddr), - "g" ((len + proto)<<8), "0" (sum)); - return sum; -} - - -/** - * csum_tcpup_magic - Compute an IPv4 pseudo header checksum. - * @saddr: source address - * @daddr: destination address - * @len: length of packet - * @proto: ip protocol of packet - * @sum: initial sum to be added in (32bit unfolded) - * - * Returns the 16bit pseudo header checksum the input data already - * complemented and ready to be filled in. - */ -static inline __sum16 -csum_tcpudp_magic(__be32 saddr, __be32 daddr, - unsigned short len, unsigned short proto, __wsum sum) -{ - return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum)); -} - -/** - * csum_partial - Compute an internet checksum. - * @buff: buffer to be checksummed - * @len: length of buffer. - * @sum: initial sum to be added in (32bit unfolded) - * - * Returns the 32bit unfolded internet checksum of the buffer. - * Before filling it in it needs to be csum_fold()'ed. - * buff should be aligned to a 64bit boundary if possible. - */ -extern __wsum csum_partial(const void *buff, int len, __wsum sum); - -#define _HAVE_ARCH_COPY_AND_CSUM_FROM_USER 1 -#define HAVE_CSUM_COPY_USER 1 - - -/* Do not call this directly. Use the wrappers below */ -extern __wsum csum_partial_copy_generic(const void *src, const void *dst, - int len, - __wsum sum, - int *src_err_ptr, int *dst_err_ptr); - - -extern __wsum csum_partial_copy_from_user(const void __user *src, void *dst, - int len, __wsum isum, int *errp); -extern __wsum csum_partial_copy_to_user(const void *src, void __user *dst, - int len, __wsum isum, int *errp); -extern __wsum csum_partial_copy_nocheck(const void *src, void *dst, int len, - __wsum sum); - -/* Old names. To be removed. */ -#define csum_and_copy_to_user csum_partial_copy_to_user -#define csum_and_copy_from_user csum_partial_copy_from_user - -/** - * ip_compute_csum - Compute an 16bit IP checksum. - * @buff: buffer address. - * @len: length of buffer. - * - * Returns the 16bit folded/inverted checksum of the passed buffer. - * Ready to fill in. - */ -extern __sum16 ip_compute_csum(const void *buff, int len); - -/** - * csum_ipv6_magic - Compute checksum of an IPv6 pseudo header. - * @saddr: source address - * @daddr: destination address - * @len: length of packet - * @proto: protocol of packet - * @sum: initial sum (32bit unfolded) to be added in - * - * Computes an IPv6 pseudo header checksum. This sum is added the checksum - * into UDP/TCP packets and contains some link layer information. - * Returns the unfolded 32bit checksum. - */ - -struct in6_addr; - -#define _HAVE_ARCH_IPV6_CSUM 1 -extern __sum16 -csum_ipv6_magic(const struct in6_addr *saddr, const struct in6_addr *daddr, - __u32 len, unsigned short proto, __wsum sum); - -static inline unsigned add32_with_carry(unsigned a, unsigned b) -{ - asm("addl %2,%0\n\t" - "adcl $0,%0" - : "=r" (a) - : "0" (a), "r" (b)); - return a; -} - -#endif - |