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156 lines
3.7 KiB
156 lines
3.7 KiB
/* -*- linux-c -*- ------------------------------------------------------- * |
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* |
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* Copyright 2002-2004 H. Peter Anvin - 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 as published by |
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* the Free Software Foundation, Inc., 53 Temple Place Ste 330, |
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* Boston MA 02111-1307, USA; either version 2 of the License, or |
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* (at your option) any later version; incorporated herein by reference. |
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* |
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* ----------------------------------------------------------------------- */ |
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/* |
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* int$#.c |
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* |
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* $#-way unrolled portable integer math RAID-6 instruction set |
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* |
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* This file is postprocessed using unroll.awk |
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*/ |
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#include <linux/raid/pq.h> |
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/* |
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* This is the C data type to use |
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*/ |
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/* Change this from BITS_PER_LONG if there is something better... */ |
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#if BITS_PER_LONG == 64 |
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# define NBYTES(x) ((x) * 0x0101010101010101UL) |
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# define NSIZE 8 |
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# define NSHIFT 3 |
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# define NSTRING "64" |
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typedef u64 unative_t; |
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#else |
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# define NBYTES(x) ((x) * 0x01010101U) |
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# define NSIZE 4 |
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# define NSHIFT 2 |
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# define NSTRING "32" |
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typedef u32 unative_t; |
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#endif |
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/* |
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* IA-64 wants insane amounts of unrolling. On other architectures that |
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* is just a waste of space. |
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*/ |
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#if ($# <= 8) || defined(__ia64__) |
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/* |
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* These sub-operations are separate inlines since they can sometimes be |
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* specially optimized using architecture-specific hacks. |
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*/ |
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/* |
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* The SHLBYTE() operation shifts each byte left by 1, *not* |
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* rolling over into the next byte |
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*/ |
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static inline __attribute_const__ unative_t SHLBYTE(unative_t v) |
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{ |
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unative_t vv; |
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vv = (v << 1) & NBYTES(0xfe); |
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return vv; |
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} |
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/* |
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* The MASK() operation returns 0xFF in any byte for which the high |
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* bit is 1, 0x00 for any byte for which the high bit is 0. |
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*/ |
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static inline __attribute_const__ unative_t MASK(unative_t v) |
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{ |
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unative_t vv; |
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vv = v & NBYTES(0x80); |
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vv = (vv << 1) - (vv >> 7); /* Overflow on the top bit is OK */ |
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return vv; |
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} |
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static void raid6_int$#_gen_syndrome(int disks, size_t bytes, void **ptrs) |
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{ |
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u8 **dptr = (u8 **)ptrs; |
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u8 *p, *q; |
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int d, z, z0; |
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unative_t wd$$, wq$$, wp$$, w1$$, w2$$; |
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z0 = disks - 3; /* Highest data disk */ |
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p = dptr[z0+1]; /* XOR parity */ |
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q = dptr[z0+2]; /* RS syndrome */ |
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for ( d = 0 ; d < bytes ; d += NSIZE*$# ) { |
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wq$$ = wp$$ = *(unative_t *)&dptr[z0][d+$$*NSIZE]; |
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for ( z = z0-1 ; z >= 0 ; z-- ) { |
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wd$$ = *(unative_t *)&dptr[z][d+$$*NSIZE]; |
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wp$$ ^= wd$$; |
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w2$$ = MASK(wq$$); |
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w1$$ = SHLBYTE(wq$$); |
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w2$$ &= NBYTES(0x1d); |
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w1$$ ^= w2$$; |
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wq$$ = w1$$ ^ wd$$; |
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} |
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*(unative_t *)&p[d+NSIZE*$$] = wp$$; |
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*(unative_t *)&q[d+NSIZE*$$] = wq$$; |
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} |
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} |
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static void raid6_int$#_xor_syndrome(int disks, int start, int stop, |
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size_t bytes, void **ptrs) |
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{ |
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u8 **dptr = (u8 **)ptrs; |
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u8 *p, *q; |
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int d, z, z0; |
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unative_t wd$$, wq$$, wp$$, w1$$, w2$$; |
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z0 = stop; /* P/Q right side optimization */ |
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p = dptr[disks-2]; /* XOR parity */ |
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q = dptr[disks-1]; /* RS syndrome */ |
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for ( d = 0 ; d < bytes ; d += NSIZE*$# ) { |
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/* P/Q data pages */ |
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wq$$ = wp$$ = *(unative_t *)&dptr[z0][d+$$*NSIZE]; |
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for ( z = z0-1 ; z >= start ; z-- ) { |
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wd$$ = *(unative_t *)&dptr[z][d+$$*NSIZE]; |
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wp$$ ^= wd$$; |
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w2$$ = MASK(wq$$); |
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w1$$ = SHLBYTE(wq$$); |
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w2$$ &= NBYTES(0x1d); |
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w1$$ ^= w2$$; |
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wq$$ = w1$$ ^ wd$$; |
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} |
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/* P/Q left side optimization */ |
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for ( z = start-1 ; z >= 0 ; z-- ) { |
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w2$$ = MASK(wq$$); |
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w1$$ = SHLBYTE(wq$$); |
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w2$$ &= NBYTES(0x1d); |
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wq$$ = w1$$ ^ w2$$; |
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} |
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*(unative_t *)&p[d+NSIZE*$$] ^= wp$$; |
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*(unative_t *)&q[d+NSIZE*$$] ^= wq$$; |
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} |
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} |
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const struct raid6_calls raid6_intx$# = { |
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raid6_int$#_gen_syndrome, |
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raid6_int$#_xor_syndrome, |
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NULL, /* always valid */ |
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"int" NSTRING "x$#", |
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0 |
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}; |
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#endif
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