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* OpenSPARC T2 Processor File: BL_Hsiao_256_10_Synd.h
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/************************************************************************
** Copyright (C) 2006, Sun Microsystems, Inc.
** Sun considers its source code as an unpublished, proprietary
** trade secret and it is available only under strict license provisions.
** This copyright notice is placed here only to protect Sun in the event
** the source is deemed a published work. Disassembly, decompilation,
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#ifndef __BL_Hsiao_256_10_Synd_h__
#define __BL_Hsiao_256_10_Synd_h__
class BL_Hsiao_256_10_Synd
: public BL_BaseSynd
BL_Hsiao_256_10_Synd(uint32_t syndrome
) : BL_BaseSynd(syndrome
)
fprintf(stderr
,"ERROR: Bad Syndrome: 0x%x", syndrome
);
BL_Hsiao_256_10_Synd(BL_Uint256 data
, BL_EccBits ecc
) :
BL_BaseSynd(BL_Hsiao_256_10_Synd::calc_check_bits(data
).get() ^ ecc
.get())
~BL_Hsiao_256_10_Synd() {}
bool isDoubleBitError() const
return (syndrome_
!= 0) && !isSingleBitError();
bool isSingleBitError() const
return find_syndrome_ndx() != -1;
bool isDataBitError() const
return (isSingleBitError() && nr_bits_set() > 1);
// This method works because the check bits are at powers of 2
// (after substracting 0x80) so the data bits break up into
uint32_t getDataBit() const
fprintf(stderr
,"ERROR: Not data bit error!");
return find_syndrome_ndx();
bool isCheckBitError() const
return (isSingleBitError() && is_power_of_two(syndrome_
));
uint32_t getCheckBit() const
fprintf(stderr
,"ERROR: Not check bit error!");
return bit2idx(syndrome_
);
bool isMultipleBitError() const { return false; }
static BL_EccBits
calc_check_bits(BL_Uint256 data
)
BL_Hsiao_256_10_Synd::hsiao_256_10_patterns
.patterns
;
return calc_checks(10, patterns
, data
);
// Number of bits set in syndrome
// This trick works up to 12 bits
uint_t
nr_bits_set() const
return (syndrome_
* 0x1001001001001ULL
& 0x84210842108421ULL
) % 0x1f;
int find_syndrome_ndx() const
for (uint_t ndx
= 0; ndx
< 120; ++ndx
)
if (syndrome_
== hsiao_256_10_patterns
.get(ndx
).get())
for (uint_t ndx
= 120; ndx
< 256; ++ndx
)
if (syndrome_
== hsiao_256_10_patterns
.get(ndx
).get())
return -1; // -1 is didn't find it
BL_EccBits
get(uint_t ndx
) const { return syndromes
[ndx
]; }
static uint64_t calc_pattern(uint_t syndrome_ndx
, uint_t pattern_ndx
);
static BL_EccBits syndromes
[256];
static Patterns hsiao_256_10_patterns
;