1*7d11965dSArd Biesheuvel/* ----------------------------------------------------------------------- 2*7d11965dSArd Biesheuvel * 3*7d11965dSArd Biesheuvel * neon.uc - RAID-6 syndrome calculation using ARM NEON instructions 4*7d11965dSArd Biesheuvel * 5*7d11965dSArd Biesheuvel * Copyright (C) 2012 Rob Herring 6*7d11965dSArd Biesheuvel * 7*7d11965dSArd Biesheuvel * Based on altivec.uc: 8*7d11965dSArd Biesheuvel * Copyright 2002-2004 H. Peter Anvin - All Rights Reserved 9*7d11965dSArd Biesheuvel * 10*7d11965dSArd Biesheuvel * This program is free software; you can redistribute it and/or modify 11*7d11965dSArd Biesheuvel * it under the terms of the GNU General Public License as published by 12*7d11965dSArd Biesheuvel * the Free Software Foundation, Inc., 53 Temple Place Ste 330, 13*7d11965dSArd Biesheuvel * Boston MA 02111-1307, USA; either version 2 of the License, or 14*7d11965dSArd Biesheuvel * (at your option) any later version; incorporated herein by reference. 15*7d11965dSArd Biesheuvel * 16*7d11965dSArd Biesheuvel * ----------------------------------------------------------------------- */ 17*7d11965dSArd Biesheuvel 18*7d11965dSArd Biesheuvel/* 19*7d11965dSArd Biesheuvel * neon$#.c 20*7d11965dSArd Biesheuvel * 21*7d11965dSArd Biesheuvel * $#-way unrolled NEON intrinsics math RAID-6 instruction set 22*7d11965dSArd Biesheuvel * 23*7d11965dSArd Biesheuvel * This file is postprocessed using unroll.awk 24*7d11965dSArd Biesheuvel */ 25*7d11965dSArd Biesheuvel 26*7d11965dSArd Biesheuvel#include <arm_neon.h> 27*7d11965dSArd Biesheuvel 28*7d11965dSArd Biesheuveltypedef uint8x16_t unative_t; 29*7d11965dSArd Biesheuvel 30*7d11965dSArd Biesheuvel#define NBYTES(x) ((unative_t){x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x}) 31*7d11965dSArd Biesheuvel#define NSIZE sizeof(unative_t) 32*7d11965dSArd Biesheuvel 33*7d11965dSArd Biesheuvel/* 34*7d11965dSArd Biesheuvel * The SHLBYTE() operation shifts each byte left by 1, *not* 35*7d11965dSArd Biesheuvel * rolling over into the next byte 36*7d11965dSArd Biesheuvel */ 37*7d11965dSArd Biesheuvelstatic inline unative_t SHLBYTE(unative_t v) 38*7d11965dSArd Biesheuvel{ 39*7d11965dSArd Biesheuvel return vshlq_n_u8(v, 1); 40*7d11965dSArd Biesheuvel} 41*7d11965dSArd Biesheuvel 42*7d11965dSArd Biesheuvel/* 43*7d11965dSArd Biesheuvel * The MASK() operation returns 0xFF in any byte for which the high 44*7d11965dSArd Biesheuvel * bit is 1, 0x00 for any byte for which the high bit is 0. 45*7d11965dSArd Biesheuvel */ 46*7d11965dSArd Biesheuvelstatic inline unative_t MASK(unative_t v) 47*7d11965dSArd Biesheuvel{ 48*7d11965dSArd Biesheuvel const uint8x16_t temp = NBYTES(0); 49*7d11965dSArd Biesheuvel return (unative_t)vcltq_s8((int8x16_t)v, (int8x16_t)temp); 50*7d11965dSArd Biesheuvel} 51*7d11965dSArd Biesheuvel 52*7d11965dSArd Biesheuvelvoid raid6_neon$#_gen_syndrome_real(int disks, unsigned long bytes, void **ptrs) 53*7d11965dSArd Biesheuvel{ 54*7d11965dSArd Biesheuvel uint8_t **dptr = (uint8_t **)ptrs; 55*7d11965dSArd Biesheuvel uint8_t *p, *q; 56*7d11965dSArd Biesheuvel int d, z, z0; 57*7d11965dSArd Biesheuvel 58*7d11965dSArd Biesheuvel register unative_t wd$$, wq$$, wp$$, w1$$, w2$$; 59*7d11965dSArd Biesheuvel const unative_t x1d = NBYTES(0x1d); 60*7d11965dSArd Biesheuvel 61*7d11965dSArd Biesheuvel z0 = disks - 3; /* Highest data disk */ 62*7d11965dSArd Biesheuvel p = dptr[z0+1]; /* XOR parity */ 63*7d11965dSArd Biesheuvel q = dptr[z0+2]; /* RS syndrome */ 64*7d11965dSArd Biesheuvel 65*7d11965dSArd Biesheuvel for ( d = 0 ; d < bytes ; d += NSIZE*$# ) { 66*7d11965dSArd Biesheuvel wq$$ = wp$$ = vld1q_u8(&dptr[z0][d+$$*NSIZE]); 67*7d11965dSArd Biesheuvel for ( z = z0-1 ; z >= 0 ; z-- ) { 68*7d11965dSArd Biesheuvel wd$$ = vld1q_u8(&dptr[z][d+$$*NSIZE]); 69*7d11965dSArd Biesheuvel wp$$ = veorq_u8(wp$$, wd$$); 70*7d11965dSArd Biesheuvel w2$$ = MASK(wq$$); 71*7d11965dSArd Biesheuvel w1$$ = SHLBYTE(wq$$); 72*7d11965dSArd Biesheuvel 73*7d11965dSArd Biesheuvel w2$$ = vandq_u8(w2$$, x1d); 74*7d11965dSArd Biesheuvel w1$$ = veorq_u8(w1$$, w2$$); 75*7d11965dSArd Biesheuvel wq$$ = veorq_u8(w1$$, wd$$); 76*7d11965dSArd Biesheuvel } 77*7d11965dSArd Biesheuvel vst1q_u8(&p[d+NSIZE*$$], wp$$); 78*7d11965dSArd Biesheuvel vst1q_u8(&q[d+NSIZE*$$], wq$$); 79*7d11965dSArd Biesheuvel } 80*7d11965dSArd Biesheuvel} 81