diff options
Diffstat (limited to 'raid6.c')
| -rw-r--r-- | raid6.c | 109 |
1 files changed, 0 insertions, 109 deletions
diff --git a/raid6.c b/raid6.c deleted file mode 100644 index 833df5f3..00000000 --- a/raid6.c +++ /dev/null @@ -1,109 +0,0 @@ -/* -*- linux-c -*- ------------------------------------------------------- * - * - * Copyright 2002-2004 H. Peter Anvin - All Rights Reserved - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation, Inc., 53 Temple Place Ste 330, - * Boston MA 02111-1307, USA; either version 2 of the License, or - * (at your option) any later version; incorporated herein by reference. - * - * ----------------------------------------------------------------------- */ - -/* - * Added helpers for unaligned native int access - */ - -/* - * raid6int1.c - * - * 1-way unrolled portable integer math RAID-6 instruction set - * - * This file was postprocessed using unroll.pl and then ported to userspace - */ -#include <stdint.h> -#include <unistd.h> -#include "kerncompat.h" -#include "ctree.h" -#include "disk-io.h" - -/* - * This is the C data type to use - */ - -/* Change this from BITS_PER_LONG if there is something better... */ -#if BITS_PER_LONG == 64 -# define NBYTES(x) ((x) * 0x0101010101010101UL) -# define NSIZE 8 -# define NSHIFT 3 -typedef uint64_t unative_t; -#define put_unaligned_native(val,p) put_unaligned_64((val),(p)) -#define get_unaligned_native(p) get_unaligned_64((p)) -#else -# define NBYTES(x) ((x) * 0x01010101U) -# define NSIZE 4 -# define NSHIFT 2 -typedef uint32_t unative_t; -#define put_unaligned_native(val,p) put_unaligned_32((val),(p)) -#define get_unaligned_native(p) get_unaligned_32((p)) -#endif - -/* - * These sub-operations are separate inlines since they can sometimes be - * specially optimized using architecture-specific hacks. - */ - -/* - * The SHLBYTE() operation shifts each byte left by 1, *not* - * rolling over into the next byte - */ -static inline __attribute_const__ unative_t SHLBYTE(unative_t v) -{ - unative_t vv; - - vv = (v << 1) & NBYTES(0xfe); - return vv; -} - -/* - * The MASK() operation returns 0xFF in any byte for which the high - * bit is 1, 0x00 for any byte for which the high bit is 0. - */ -static inline __attribute_const__ unative_t MASK(unative_t v) -{ - unative_t vv; - - vv = v & NBYTES(0x80); - vv = (vv << 1) - (vv >> 7); /* Overflow on the top bit is OK */ - return vv; -} - - -void raid6_gen_syndrome(int disks, size_t bytes, void **ptrs) -{ - uint8_t **dptr = (uint8_t **)ptrs; - uint8_t *p, *q; - int d, z, z0; - - unative_t wd0, wq0, wp0, w10, w20; - - z0 = disks - 3; /* Highest data disk */ - p = dptr[z0+1]; /* XOR parity */ - q = dptr[z0+2]; /* RS syndrome */ - - for ( d = 0 ; d < bytes ; d += NSIZE*1 ) { - wq0 = wp0 = get_unaligned_native(&dptr[z0][d+0*NSIZE]); - for ( z = z0-1 ; z >= 0 ; z-- ) { - wd0 = get_unaligned_native(&dptr[z][d+0*NSIZE]); - wp0 ^= wd0; - w20 = MASK(wq0); - w10 = SHLBYTE(wq0); - w20 &= NBYTES(0x1d); - w10 ^= w20; - wq0 = w10 ^ wd0; - } - put_unaligned_native(wp0, &p[d+NSIZE*0]); - put_unaligned_native(wq0, &q[d+NSIZE*0]); - } -} - |