ac85227f76
The 'copy_user' symbol can be used to copy from or to userland so we will use two different symbols for these operations. This makes no difference in the existing code, but when the core is operating in EVA mode, different instructions need to be used to read and write to userland address space. The old function has also been renamed to 'copy_kernel' to denote that it is suitable for copy data to and from kernel space. Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
267 lines
6.0 KiB
C
267 lines
6.0 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 1995, 96, 97, 98, 99, 2001 by Ralf Baechle
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* Copyright (C) 1999 Silicon Graphics, Inc.
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* Copyright (C) 2001 Thiemo Seufer.
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* Copyright (C) 2002 Maciej W. Rozycki
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* Copyright (C) 2014 Imagination Technologies Ltd.
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*/
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#ifndef _ASM_CHECKSUM_H
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#define _ASM_CHECKSUM_H
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#include <linux/in6.h>
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#include <asm/uaccess.h>
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/*
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* computes the checksum of a memory block at buff, length len,
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* and adds in "sum" (32-bit)
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*
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* returns a 32-bit number suitable for feeding into itself
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* or csum_tcpudp_magic
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*
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* this function must be called with even lengths, except
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* for the last fragment, which may be odd
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*
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* it's best to have buff aligned on a 32-bit boundary
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*/
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__wsum csum_partial(const void *buff, int len, __wsum sum);
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__wsum __csum_partial_copy_kernel(const void *src, void *dst,
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int len, __wsum sum, int *err_ptr);
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__wsum __csum_partial_copy_from_user(const void *src, void *dst,
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int len, __wsum sum, int *err_ptr);
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__wsum __csum_partial_copy_to_user(const void *src, void *dst,
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int len, __wsum sum, int *err_ptr);
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/*
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* this is a new version of the above that records errors it finds in *errp,
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* but continues and zeros the rest of the buffer.
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*/
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static inline
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__wsum csum_partial_copy_from_user(const void __user *src, void *dst, int len,
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__wsum sum, int *err_ptr)
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{
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might_fault();
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return __csum_partial_copy_from_user((__force void *)src, dst,
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len, sum, err_ptr);
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}
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/*
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* Copy and checksum to user
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*/
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#define HAVE_CSUM_COPY_USER
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static inline
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__wsum csum_and_copy_to_user(const void *src, void __user *dst, int len,
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__wsum sum, int *err_ptr)
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{
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might_fault();
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if (access_ok(VERIFY_WRITE, dst, len))
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return __csum_partial_copy_to_user(src, (__force void *)dst,
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len, sum, err_ptr);
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if (len)
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*err_ptr = -EFAULT;
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return (__force __wsum)-1; /* invalid checksum */
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}
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/*
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* the same as csum_partial, but copies from user space (but on MIPS
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* we have just one address space, so this is identical to the above)
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*/
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__wsum csum_partial_copy_nocheck(const void *src, void *dst,
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int len, __wsum sum);
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/*
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* Fold a partial checksum without adding pseudo headers
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*/
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static inline __sum16 csum_fold(__wsum sum)
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{
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__asm__(
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" .set push # csum_fold\n"
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" .set noat \n"
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" sll $1, %0, 16 \n"
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" addu %0, $1 \n"
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" sltu $1, %0, $1 \n"
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" srl %0, %0, 16 \n"
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" addu %0, $1 \n"
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" xori %0, 0xffff \n"
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" .set pop"
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: "=r" (sum)
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: "0" (sum));
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return (__force __sum16)sum;
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}
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/*
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* This is a version of ip_compute_csum() optimized for IP headers,
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* which always checksum on 4 octet boundaries.
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*
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* By Jorge Cwik <jorge@laser.satlink.net>, adapted for linux by
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* Arnt Gulbrandsen.
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*/
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static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl)
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{
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const unsigned int *word = iph;
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const unsigned int *stop = word + ihl;
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unsigned int csum;
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int carry;
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csum = word[0];
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csum += word[1];
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carry = (csum < word[1]);
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csum += carry;
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csum += word[2];
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carry = (csum < word[2]);
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csum += carry;
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csum += word[3];
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carry = (csum < word[3]);
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csum += carry;
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word += 4;
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do {
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csum += *word;
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carry = (csum < *word);
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csum += carry;
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word++;
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} while (word != stop);
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return csum_fold(csum);
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}
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static inline __wsum csum_tcpudp_nofold(__be32 saddr,
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__be32 daddr, unsigned short len, unsigned short proto,
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__wsum sum)
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{
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__asm__(
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" .set push # csum_tcpudp_nofold\n"
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" .set noat \n"
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#ifdef CONFIG_32BIT
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" addu %0, %2 \n"
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" sltu $1, %0, %2 \n"
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" addu %0, $1 \n"
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" addu %0, %3 \n"
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" sltu $1, %0, %3 \n"
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" addu %0, $1 \n"
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" addu %0, %4 \n"
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" sltu $1, %0, %4 \n"
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" addu %0, $1 \n"
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#endif
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#ifdef CONFIG_64BIT
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" daddu %0, %2 \n"
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" daddu %0, %3 \n"
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" daddu %0, %4 \n"
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" dsll32 $1, %0, 0 \n"
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" daddu %0, $1 \n"
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" dsra32 %0, %0, 0 \n"
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#endif
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" .set pop"
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: "=r" (sum)
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: "0" ((__force unsigned long)daddr),
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"r" ((__force unsigned long)saddr),
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#ifdef __MIPSEL__
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"r" ((proto + len) << 8),
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#else
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"r" (proto + len),
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#endif
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"r" ((__force unsigned long)sum));
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return sum;
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}
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/*
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* computes the checksum of the TCP/UDP pseudo-header
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* returns a 16-bit checksum, already complemented
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*/
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static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr,
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unsigned short len,
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unsigned short proto,
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__wsum sum)
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{
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return csum_fold(csum_tcpudp_nofold(saddr, daddr, len, proto, sum));
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}
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/*
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* this routine is used for miscellaneous IP-like checksums, mainly
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* in icmp.c
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*/
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static inline __sum16 ip_compute_csum(const void *buff, int len)
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{
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return csum_fold(csum_partial(buff, len, 0));
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}
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#define _HAVE_ARCH_IPV6_CSUM
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static __inline__ __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
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const struct in6_addr *daddr,
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__u32 len, unsigned short proto,
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__wsum sum)
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{
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__asm__(
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" .set push # csum_ipv6_magic\n"
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" .set noreorder \n"
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" .set noat \n"
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" addu %0, %5 # proto (long in network byte order)\n"
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" sltu $1, %0, %5 \n"
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" addu %0, $1 \n"
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" addu %0, %6 # csum\n"
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" sltu $1, %0, %6 \n"
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" lw %1, 0(%2) # four words source address\n"
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" addu %0, $1 \n"
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" addu %0, %1 \n"
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" sltu $1, %0, %1 \n"
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" lw %1, 4(%2) \n"
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" addu %0, $1 \n"
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" addu %0, %1 \n"
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" sltu $1, %0, %1 \n"
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" lw %1, 8(%2) \n"
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" addu %0, $1 \n"
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" addu %0, %1 \n"
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" sltu $1, %0, %1 \n"
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" lw %1, 12(%2) \n"
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" addu %0, $1 \n"
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" addu %0, %1 \n"
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" sltu $1, %0, %1 \n"
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" lw %1, 0(%3) \n"
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" addu %0, $1 \n"
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" addu %0, %1 \n"
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" sltu $1, %0, %1 \n"
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" lw %1, 4(%3) \n"
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" addu %0, $1 \n"
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" addu %0, %1 \n"
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" sltu $1, %0, %1 \n"
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" lw %1, 8(%3) \n"
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" addu %0, $1 \n"
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" addu %0, %1 \n"
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" sltu $1, %0, %1 \n"
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" lw %1, 12(%3) \n"
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" addu %0, $1 \n"
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" addu %0, %1 \n"
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" sltu $1, %0, %1 \n"
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" addu %0, $1 # Add final carry\n"
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" .set pop"
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: "=r" (sum), "=r" (proto)
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: "r" (saddr), "r" (daddr),
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"0" (htonl(len)), "1" (htonl(proto)), "r" (sum));
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return csum_fold(sum);
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}
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#endif /* _ASM_CHECKSUM_H */
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