#ifndef _X86_64_CHECKSUM_H
#define _X86_64_CHECKSUM_H
-/*
- * Checksums for x86-64
- * Copyright 2002 by Andi Kleen, SuSE Labs
+/*
+ * Checksums for x86-64
+ * Copyright 2002 by Andi Kleen, SuSE Labs
* with some code from asm-x86/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)
- );
+ 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);
}
* 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:"
+ 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");
+ : "=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
+ * @sum: initial sum to be added in (32bit unfolded)
+ *
+ * Returns the pseudo header checksum the input data. Result is
* 32bit unfolded.
*/
static inline __wsum
" adcl %2, %0\n"
" adcl %3, %0\n"
" adcl $0, %0\n"
- : "=r" (sum)
+ : "=r" (sum)
: "g" (daddr), "g" (saddr),
"g" ((len + proto)<<8), "0" (sum));
- return 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)
- *
+ * @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)
+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));
+ 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.
* 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
/* 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);
+ 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);
+ 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);
+ 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.
* @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
+ * 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.
*/
static inline unsigned add32_with_carry(unsigned a, unsigned b)
{
asm("addl %2,%0\n\t"
- "adcl $0,%0"
- : "=r" (a)
+ "adcl $0,%0"
+ : "=r" (a)
: "0" (a), "r" (b));
return a;
}
#endif
-
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