isa-l/raid/raid_base.c

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  modification, are permitted provided that the following conditions
  are met:
    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
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      notice, this list of conditions and the following disclaimer in
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      distribution.
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      contributors may be used to endorse or promote products derived
      from this software without specific prior written permission.

  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#include <limits.h>
#include <stdint.h>

#if __WORDSIZE == 64 || _WIN64 || __x86_64__
# define notbit0 0xfefefefefefefefeULL
# define bit7    0x8080808080808080ULL
# define gf8poly 0x1d1d1d1d1d1d1d1dULL
#else
# define notbit0 0xfefefefeUL
# define bit7    0x80808080UL
# define gf8poly 0x1d1d1d1dUL
#endif

int pq_gen_base(int vects, int len, void **array)
{
	int i, j;
	unsigned long p, q, s;
	unsigned long **src = (unsigned long **)array;
	int blocks = len / sizeof(long);

	if (vects < 4)
		return 1;	// Must have at least 2 src and 2 dest

	for (i = 0; i < blocks; i++) {
		q = p = src[vects - 3][i];

		for (j = vects - 4; j >= 0; j--) {
			p ^= s = src[j][i];
			q = s ^ (((q << 1) & notbit0) ^	// shift each byte
				 ((((q & bit7) << 1) - ((q & bit7) >> 7))	// mask out bytes
				  & gf8poly));	// apply poly
		}

		src[vects - 2][i] = p;	// second to last pointer is p
		src[vects - 1][i] = q;	// last pointer is q
	}
	return 0;
}

int pq_check_base(int vects, int len, void **array)
{
	int i, j;
	unsigned char p, q, s;
	unsigned char **src = (unsigned char **)array;

	if (vects < 4)
		return 1;	// Must have at least 2 src and 2 dest

	for (i = 0; i < len; i++) {
		q = p = src[vects - 3][i];

		for (j = vects - 4; j >= 0; j--) {
			s = src[j][i];
			p ^= s;

			// mult by GF{2}
			q = s ^ ((q << 1) ^ ((q & 0x80) ? 0x1d : 0));
		}

		if (src[vects - 2][i] != p)	// second to last pointer is p
			return i | 1;
		if (src[vects - 1][i] != q)	// last pointer is q
			return i | 2;
	}
	return 0;
}

int xor_gen_base(int vects, int len, void **array)
{
	int i, j;
	unsigned char parity;
	unsigned char **src = (unsigned char **)array;

	if (vects < 3)
		return 1;	// Must have at least 2 src and 1 dest

	for (i = 0; i < len; i++) {
		parity = src[0][i];
		for (j = 1; j < vects - 1; j++)
			parity ^= src[j][i];

		src[vects - 1][i] = parity;	// last pointer is dest

	}

	return 0;
}

int xor_check_base(int vects, int len, void **array)
{
	int i, j, fail = 0;

	unsigned char parity;
	unsigned char **src = (unsigned char **)array;

	if (vects < 2)
		return 1;	// Must have at least 2 src

	for (i = 0; i < len; i++) {
		parity = 0;
		for (j = 0; j < vects; j++)
			parity ^= src[j][i];

		if (parity != 0) {
			fail = 1;
			break;
		}
	}
	if (fail && len > 0)
		return len;
	return fail;
}

struct slver {
	unsigned short snum;
	unsigned char ver;
	unsigned char core;
};

struct slver pq_gen_base_slver_0001012a;
struct slver pq_gen_base_slver = { 0x012a, 0x01, 0x00 };

struct slver xor_gen_base_slver_0001012b;
struct slver xor_gen_base_slver = { 0x012b, 0x01, 0x00 };

struct slver pq_check_base_slver_0001012c;
struct slver pq_check_base_slver = { 0x012c, 0x01, 0x00 };

struct slver xor_check_base_slver_0001012d;
struct slver xor_check_base_slver = { 0x012d, 0x01, 0x00 };