214 lines
5.7 KiB
C
214 lines
5.7 KiB
C
#ifndef _PARISC_CHECKSUM_H
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#define _PARISC_CHECKSUM_H
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#include <linux/in6.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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extern unsigned int csum_partial(const unsigned char *, int, unsigned int);
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/*
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* The same as csum_partial, but copies from src while it checksums.
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*
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* Here even more important to align src and dst on a 32-bit (or even
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* better 64-bit) boundary
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*/
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extern unsigned int csum_partial_copy_nocheck(const unsigned char *, unsigned char *,
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int, unsigned int);
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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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extern unsigned int csum_partial_copy_from_user(const unsigned char __user *src,
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unsigned char *dst, int len, unsigned int sum, int *errp);
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/*
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* Optimized for IP headers, which always checksum on 4 octet boundaries.
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*
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* Written by Randolph Chung <tausq@debian.org>, and then mucked with by
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* LaMont Jones <lamont@debian.org>
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*/
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static inline unsigned short ip_fast_csum(unsigned char * iph,
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unsigned int ihl) {
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unsigned int sum;
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__asm__ __volatile__ (
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" ldws,ma 4(%1), %0\n"
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" addib,<= -4, %2, 2f\n"
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"\n"
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" ldws 4(%1), %%r20\n"
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" ldws 8(%1), %%r21\n"
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" add %0, %%r20, %0\n"
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" ldws,ma 12(%1), %%r19\n"
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" addc %0, %%r21, %0\n"
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" addc %0, %%r19, %0\n"
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"1: ldws,ma 4(%1), %%r19\n"
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" addib,< 0, %2, 1b\n"
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" addc %0, %%r19, %0\n"
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"\n"
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" extru %0, 31, 16, %%r20\n"
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" extru %0, 15, 16, %%r21\n"
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" addc %%r20, %%r21, %0\n"
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" extru %0, 15, 16, %%r21\n"
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" add %0, %%r21, %0\n"
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" subi -1, %0, %0\n"
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"2:\n"
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: "=r" (sum), "=r" (iph), "=r" (ihl)
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: "1" (iph), "2" (ihl)
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: "r19", "r20", "r21" );
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return(sum);
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}
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/*
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* Fold a partial checksum
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*/
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static inline unsigned int csum_fold(unsigned int sum)
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{
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/* add the swapped two 16-bit halves of sum,
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a possible carry from adding the two 16-bit halves,
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will carry from the lower half into the upper half,
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giving us the correct sum in the upper half. */
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sum += (sum << 16) + (sum >> 16);
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return (~sum) >> 16;
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}
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static inline unsigned long csum_tcpudp_nofold(unsigned long saddr,
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unsigned long daddr,
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unsigned short len,
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unsigned short proto,
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unsigned int sum)
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{
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__asm__(
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" add %1, %0, %0\n"
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" addc %2, %0, %0\n"
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" addc %3, %0, %0\n"
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" addc %%r0, %0, %0\n"
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: "=r" (sum)
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: "r" (daddr), "r"(saddr), "r"((proto<<16)+len), "0"(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 unsigned short int csum_tcpudp_magic(unsigned long saddr,
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unsigned long daddr,
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unsigned short len,
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unsigned short proto,
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unsigned int 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 unsigned short ip_compute_csum(unsigned char * buf, int len) {
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return csum_fold (csum_partial(buf, len, 0));
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}
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#define _HAVE_ARCH_IPV6_CSUM
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static __inline__ unsigned short int csum_ipv6_magic(struct in6_addr *saddr,
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struct in6_addr *daddr,
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__u16 len,
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unsigned short proto,
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unsigned int sum)
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{
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__asm__ __volatile__ (
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#if BITS_PER_LONG > 32
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/*
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** We can execute two loads and two adds per cycle on PA 8000.
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** But add insn's get serialized waiting for the carry bit.
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** Try to keep 4 registers with "live" values ahead of the ALU.
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*/
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" ldd,ma 8(%1), %%r19\n" /* get 1st saddr word */
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" ldd,ma 8(%2), %%r20\n" /* get 1st daddr word */
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" add %8, %3, %3\n"/* add 16-bit proto + len */
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" add %%r19, %0, %0\n"
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" ldd,ma 8(%1), %%r21\n" /* 2cd saddr */
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" ldd,ma 8(%2), %%r22\n" /* 2cd daddr */
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" add,dc %%r20, %0, %0\n"
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" add,dc %%r21, %0, %0\n"
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" add,dc %%r22, %0, %0\n"
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" add,dc %3, %0, %0\n" /* fold in proto+len | carry bit */
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" extrd,u %0, 31, 32, %%r19\n" /* copy upper half down */
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" depdi 0, 31, 32, %0\n" /* clear upper half */
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" add %%r19, %0, %0\n" /* fold into 32-bits */
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" addc 0, %0, %0\n" /* add carry */
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#else
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/*
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** For PA 1.x, the insn order doesn't matter as much.
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** Insn stream is serialized on the carry bit here too.
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** result from the previous operation (eg r0 + x)
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*/
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" ldw,ma 4(%1), %%r19\n" /* get 1st saddr word */
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" ldw,ma 4(%2), %%r20\n" /* get 1st daddr word */
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" add %8, %3, %3\n" /* add 16-bit proto + len */
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" add %%r19, %0, %0\n"
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" ldw,ma 4(%1), %%r21\n" /* 2cd saddr */
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" addc %%r20, %0, %0\n"
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" ldw,ma 4(%2), %%r22\n" /* 2cd daddr */
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" addc %%r21, %0, %0\n"
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" ldw,ma 4(%1), %%r19\n" /* 3rd saddr */
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" addc %%r22, %0, %0\n"
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" ldw,ma 4(%2), %%r20\n" /* 3rd daddr */
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" addc %%r19, %0, %0\n"
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" ldw,ma 4(%1), %%r21\n" /* 4th saddr */
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" addc %%r20, %0, %0\n"
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" ldw,ma 4(%2), %%r22\n" /* 4th daddr */
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" addc %%r21, %0, %0\n"
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" addc %%r22, %0, %0\n"
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" addc %3, %0, %0\n" /* fold in proto+len, catch carry */
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#endif
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: "=r" (sum), "=r" (saddr), "=r" (daddr), "=r" (len)
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: "0" (sum), "1" (saddr), "2" (daddr), "3" (len), "r" (proto)
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: "r19", "r20", "r21", "r22");
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return csum_fold(sum);
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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__ unsigned int csum_and_copy_to_user (const unsigned char *src,
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unsigned char __user *dst,
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int len, int sum,
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int *err_ptr)
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{
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/* code stolen from include/asm-mips64 */
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sum = csum_partial(src, len, sum);
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if (copy_to_user(dst, src, len)) {
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*err_ptr = -EFAULT;
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return -1;
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}
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return sum;
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}
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#endif
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