Hexagon: Add checksum functions
Signed-off-by: Richard Kuo <rkuo@codeaurora.org> Signed-off-by: Linas Vepstas <linas@codeaurora.org> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Richard Kuo
Linus Torvalds
parent
b7840983e8
commit
075a46a049
50
arch/hexagon/include/asm/checksum.h
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50
arch/hexagon/include/asm/checksum.h
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/*
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* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*/
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#ifndef _ASM_CHECKSUM_H
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#define _ASM_CHECKSUM_H
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#define do_csum do_csum
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unsigned int do_csum(const void *voidptr, int len);
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/*
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* the same as csum_partial, but copies from src while it
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* 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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#define csum_partial_copy_nocheck csum_partial_copy_nocheck
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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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* 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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#define csum_tcpudp_nofold csum_tcpudp_nofold
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__wsum csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr,
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unsigned short len, unsigned short proto, __wsum sum);
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#define csum_tcpudp_magic csum_tcpudp_magic
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__sum16 csum_tcpudp_magic(unsigned long saddr, unsigned long daddr,
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unsigned short len, unsigned short proto, __wsum sum);
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#include <asm-generic/checksum.h>
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#endif
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26
arch/hexagon/include/asm/intrinsics.h
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arch/hexagon/include/asm/intrinsics.h
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/*
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* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*/
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#ifndef _ASM_HEXAGON_INTRINSICS_H
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#define _ASM_HEXAGON_INTRINSICS_H
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#define HEXAGON_P_vrmpyhacc_PP __builtin_HEXAGON_M2_vrmac_s0
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#define HEXAGON_P_vrmpyh_PP __builtin_HEXAGON_M2_vrmpy_s0
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#define HEXAGON_R_cl0_R __builtin_HEXAGON_S2_cl0
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#endif
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203
arch/hexagon/lib/checksum.c
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arch/hexagon/lib/checksum.c
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/*
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* Checksum functions for Hexagon
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*
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* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*/
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/* This was derived from arch/alpha/lib/checksum.c */
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#include <linux/module.h>
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#include <linux/string.h>
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#include <asm/byteorder.h>
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#include <net/checksum.h>
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#include <linux/uaccess.h>
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#include <asm/intrinsics.h>
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/* Vector value operations */
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#define SIGN(x, y) ((0x8000ULL*x)<<y)
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#define CARRY(x, y) ((0x0002ULL*x)<<y)
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#define SELECT(x, y) ((0x0001ULL*x)<<y)
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#define VR_NEGATE(a, b, c, d) (SIGN(a, 48) + SIGN(b, 32) + SIGN(c, 16) \
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+ SIGN(d, 0))
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#define VR_CARRY(a, b, c, d) (CARRY(a, 48) + CARRY(b, 32) + CARRY(c, 16) \
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+ CARRY(d, 0))
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#define VR_SELECT(a, b, c, d) (SELECT(a, 48) + SELECT(b, 32) + SELECT(c, 16) \
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+ SELECT(d, 0))
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/* optimized HEXAGON V3 intrinsic version */
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static inline unsigned short from64to16(u64 x)
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{
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u64 sum;
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sum = HEXAGON_P_vrmpyh_PP(x^VR_NEGATE(1, 1, 1, 1),
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VR_SELECT(1, 1, 1, 1));
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sum += VR_CARRY(0, 0, 1, 0);
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sum = HEXAGON_P_vrmpyh_PP(sum, VR_SELECT(0, 0, 1, 1));
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return 0xFFFF & 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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__sum16 csum_tcpudp_magic(unsigned long saddr, unsigned long daddr,
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unsigned short len, unsigned short proto,
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__wsum sum)
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{
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return (__force __sum16)~from64to16(
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(__force u64)saddr + (__force u64)daddr +
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(__force u64)sum + ((len + proto) << 8));
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}
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__wsum csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr,
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unsigned short len, unsigned short proto,
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__wsum sum)
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{
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u64 result;
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result = (__force u64)saddr + (__force u64)daddr +
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(__force u64)sum + ((len + proto) << 8);
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/* Fold down to 32-bits so we don't lose in the typedef-less
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network stack. */
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/* 64 to 33 */
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result = (result & 0xffffffffUL) + (result >> 32);
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/* 33 to 32 */
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result = (result & 0xffffffffUL) + (result >> 32);
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return (__force __wsum)result;
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}
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EXPORT_SYMBOL(csum_tcpudp_nofold);
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/*
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* Do a 64-bit checksum on an arbitrary memory area..
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*
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* This isn't a great routine, but it's not _horrible_ either. The
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* inner loop could be unrolled a bit further, and there are better
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* ways to do the carry, but this is reasonable.
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*/
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/* optimized HEXAGON intrinsic version, with over read fixed */
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unsigned int do_csum(const void *voidptr, int len)
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{
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u64 sum0, sum1, x0, x1, *ptr8_o, *ptr8_e, *ptr8;
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int i, start, mid, end, mask;
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const char *ptr = voidptr;
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unsigned short *ptr2;
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unsigned int *ptr4;
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if (len <= 0)
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return 0;
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start = 0xF & (16-(((int) ptr) & 0xF)) ;
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mask = 0x7fffffffUL >> HEXAGON_R_cl0_R(len);
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start = start & mask ;
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mid = len - start;
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end = mid & 0xF;
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mid = mid>>4;
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sum0 = mid << 18;
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sum1 = 0;
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if (start & 1)
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sum0 += (u64) (ptr[0] << 8);
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ptr2 = (unsigned short *) &ptr[start & 1];
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if (start & 2)
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sum1 += (u64) ptr2[0];
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ptr4 = (unsigned int *) &ptr[start & 3];
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if (start & 4) {
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sum0 = HEXAGON_P_vrmpyhacc_PP(sum0,
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VR_NEGATE(0, 0, 1, 1)^((u64)ptr4[0]),
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VR_SELECT(0, 0, 1, 1));
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sum0 += VR_SELECT(0, 0, 1, 0);
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}
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ptr8 = (u64 *) &ptr[start & 7];
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if (start & 8) {
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sum1 = HEXAGON_P_vrmpyhacc_PP(sum1,
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VR_NEGATE(1, 1, 1, 1)^(ptr8[0]),
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VR_SELECT(1, 1, 1, 1));
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sum1 += VR_CARRY(0, 0, 1, 0);
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}
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ptr8_o = (u64 *) (ptr + start);
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ptr8_e = (u64 *) (ptr + start + 8);
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if (mid) {
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x0 = *ptr8_e; ptr8_e += 2;
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x1 = *ptr8_o; ptr8_o += 2;
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if (mid > 1)
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for (i = 0; i < mid-1; i++) {
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sum0 = HEXAGON_P_vrmpyhacc_PP(sum0,
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x0^VR_NEGATE(1, 1, 1, 1),
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VR_SELECT(1, 1, 1, 1));
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sum1 = HEXAGON_P_vrmpyhacc_PP(sum1,
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x1^VR_NEGATE(1, 1, 1, 1),
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VR_SELECT(1, 1, 1, 1));
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x0 = *ptr8_e; ptr8_e += 2;
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x1 = *ptr8_o; ptr8_o += 2;
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}
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sum0 = HEXAGON_P_vrmpyhacc_PP(sum0, x0^VR_NEGATE(1, 1, 1, 1),
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VR_SELECT(1, 1, 1, 1));
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sum1 = HEXAGON_P_vrmpyhacc_PP(sum1, x1^VR_NEGATE(1, 1, 1, 1),
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VR_SELECT(1, 1, 1, 1));
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}
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ptr4 = (unsigned int *) &ptr[start + (mid * 16) + (end & 8)];
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if (end & 4) {
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sum1 = HEXAGON_P_vrmpyhacc_PP(sum1,
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VR_NEGATE(0, 0, 1, 1)^((u64)ptr4[0]),
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VR_SELECT(0, 0, 1, 1));
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sum1 += VR_SELECT(0, 0, 1, 0);
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}
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ptr2 = (unsigned short *) &ptr[start + (mid * 16) + (end & 12)];
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if (end & 2)
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sum0 += (u64) ptr2[0];
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if (end & 1)
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sum1 += (u64) ptr[start + (mid * 16) + (end & 14)];
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ptr8 = (u64 *) &ptr[start + (mid * 16)];
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if (end & 8) {
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sum0 = HEXAGON_P_vrmpyhacc_PP(sum0,
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VR_NEGATE(1, 1, 1, 1)^(ptr8[0]),
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VR_SELECT(1, 1, 1, 1));
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sum0 += VR_CARRY(0, 0, 1, 0);
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}
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sum0 = HEXAGON_P_vrmpyh_PP((sum0+sum1)^VR_NEGATE(0, 0, 0, 1),
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VR_SELECT(0, 0, 1, 1));
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sum0 += VR_NEGATE(0, 0, 0, 1);
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sum0 = HEXAGON_P_vrmpyh_PP(sum0, VR_SELECT(0, 0, 1, 1));
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if (start & 1)
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sum0 = (sum0 << 8) | (0xFF & (sum0 >> 8));
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return 0xFFFF & sum0;
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}
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/*
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* copy from ds while checksumming, otherwise like csum_partial
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*/
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__wsum
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csum_partial_copy_nocheck(const void *src, void *dst, int len, __wsum sum)
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{
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memcpy(dst, src, len);
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return csum_partial(dst, len, sum);
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}
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