mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-25 09:20:50 +07:00
1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
118 lines
2.7 KiB
Ucode
118 lines
2.7 KiB
Ucode
/* -*- 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,
|
|
* Bostom MA 02111-1307, USA; either version 2 of the License, or
|
|
* (at your option) any later version; incorporated herein by reference.
|
|
*
|
|
* ----------------------------------------------------------------------- */
|
|
|
|
/*
|
|
* raid6int$#.c
|
|
*
|
|
* $#-way unrolled portable integer math RAID-6 instruction set
|
|
*
|
|
* This file is postprocessed using unroll.pl
|
|
*/
|
|
|
|
#include "raid6.h"
|
|
|
|
/*
|
|
* This is the C data type to use
|
|
*/
|
|
|
|
/* Change this from BITS_PER_LONG if there is something better... */
|
|
#if BITS_PER_LONG == 64
|
|
# define NBYTES(x) ((x) * 0x0101010101010101UL)
|
|
# define NSIZE 8
|
|
# define NSHIFT 3
|
|
# define NSTRING "64"
|
|
typedef u64 unative_t;
|
|
#else
|
|
# define NBYTES(x) ((x) * 0x01010101U)
|
|
# define NSIZE 4
|
|
# define NSHIFT 2
|
|
# define NSTRING "32"
|
|
typedef u32 unative_t;
|
|
#endif
|
|
|
|
|
|
|
|
/*
|
|
* IA-64 wants insane amounts of unrolling. On other architectures that
|
|
* is just a waste of space.
|
|
*/
|
|
#if ($# <= 8) || defined(__ia64__)
|
|
|
|
|
|
/*
|
|
* 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;
|
|
}
|
|
|
|
|
|
static void raid6_int$#_gen_syndrome(int disks, size_t bytes, void **ptrs)
|
|
{
|
|
u8 **dptr = (u8 **)ptrs;
|
|
u8 *p, *q;
|
|
int d, z, z0;
|
|
|
|
unative_t wd$$, wq$$, wp$$, w1$$, w2$$;
|
|
|
|
z0 = disks - 3; /* Highest data disk */
|
|
p = dptr[z0+1]; /* XOR parity */
|
|
q = dptr[z0+2]; /* RS syndrome */
|
|
|
|
for ( d = 0 ; d < bytes ; d += NSIZE*$# ) {
|
|
wq$$ = wp$$ = *(unative_t *)&dptr[z0][d+$$*NSIZE];
|
|
for ( z = z0-1 ; z >= 0 ; z-- ) {
|
|
wd$$ = *(unative_t *)&dptr[z][d+$$*NSIZE];
|
|
wp$$ ^= wd$$;
|
|
w2$$ = MASK(wq$$);
|
|
w1$$ = SHLBYTE(wq$$);
|
|
w2$$ &= NBYTES(0x1d);
|
|
w1$$ ^= w2$$;
|
|
wq$$ = w1$$ ^ wd$$;
|
|
}
|
|
*(unative_t *)&p[d+NSIZE*$$] = wp$$;
|
|
*(unative_t *)&q[d+NSIZE*$$] = wq$$;
|
|
}
|
|
}
|
|
|
|
const struct raid6_calls raid6_intx$# = {
|
|
raid6_int$#_gen_syndrome,
|
|
NULL, /* always valid */
|
|
"int" NSTRING "x$#",
|
|
0
|
|
};
|
|
|
|
#endif
|