1/* -*- linux-c -*- ------------------------------------------------------- * 2 * 3 * Copyright 2002 H. Peter Anvin - All Rights Reserved 4 * Copyright 2012 Tilera Corporation - All Rights Reserved 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation, Inc., 53 Temple Place Ste 330, 9 * Boston MA 02111-1307, USA; either version 2 of the License, or 10 * (at your option) any later version; incorporated herein by reference. 11 * 12 * ----------------------------------------------------------------------- */ 13 14/* 15 * tilegx$#.c 16 * 17 * $#-way unrolled TILE-Gx SIMD for RAID-6 math. 18 * 19 * This file is postprocessed using unroll.awk. 20 * 21 */ 22 23#include <linux/raid/pq.h> 24 25/* Create 8 byte copies of constant byte */ 26# define NBYTES(x) (__insn_v1addi(0, x)) 27# define NSIZE 8 28 29/* 30 * The SHLBYTE() operation shifts each byte left by 1, *not* 31 * rolling over into the next byte 32 */ 33static inline __attribute_const__ u64 SHLBYTE(u64 v) 34{ 35 /* Vector One Byte Shift Left Immediate. */ 36 return __insn_v1shli(v, 1); 37} 38 39/* 40 * The MASK() operation returns 0xFF in any byte for which the high 41 * bit is 1, 0x00 for any byte for which the high bit is 0. 42 */ 43static inline __attribute_const__ u64 MASK(u64 v) 44{ 45 /* Vector One Byte Shift Right Signed Immediate. */ 46 return __insn_v1shrsi(v, 7); 47} 48 49 50void raid6_tilegx$#_gen_syndrome(int disks, size_t bytes, void **ptrs) 51{ 52 u8 **dptr = (u8 **)ptrs; 53 u64 *p, *q; 54 int d, z, z0; 55 56 u64 wd$$, wq$$, wp$$, w1$$, w2$$; 57 u64 x1d = NBYTES(0x1d); 58 u64 * z0ptr; 59 60 z0 = disks - 3; /* Highest data disk */ 61 p = (u64 *)dptr[z0+1]; /* XOR parity */ 62 q = (u64 *)dptr[z0+2]; /* RS syndrome */ 63 64 z0ptr = (u64 *)&dptr[z0][0]; 65 for ( d = 0 ; d < bytes ; d += NSIZE*$# ) { 66 wq$$ = wp$$ = *z0ptr++; 67 for ( z = z0-1 ; z >= 0 ; z-- ) { 68 wd$$ = *(u64 *)&dptr[z][d+$$*NSIZE]; 69 wp$$ = wp$$ ^ wd$$; 70 w2$$ = MASK(wq$$); 71 w1$$ = SHLBYTE(wq$$); 72 w2$$ = w2$$ & x1d; 73 w1$$ = w1$$ ^ w2$$; 74 wq$$ = w1$$ ^ wd$$; 75 } 76 *p++ = wp$$; 77 *q++ = wq$$; 78 } 79} 80 81const struct raid6_calls raid6_tilegx$# = { 82 raid6_tilegx$#_gen_syndrome, 83 NULL, /* XOR not yet implemented */ 84 NULL, 85 "tilegx$#", 86 0 87}; 88