0x69, 0x3c, 0x30, 0x65, 0x0c, 0x59, 0x55, 0x00,
};
-/* Count the bits in an unsigned char or a U32 */
-
-static int yaffs_count_bits(unsigned char x)
-{
- int r = 0;
- while (x) {
- if (x & 1)
- r++;
- x >>= 1;
- }
- return r;
-}
-
-static int yaffs_count_bits32(unsigned x)
-{
- int r = 0;
- while (x) {
- if (x & 1)
- r++;
- x >>= 1;
- }
- return r;
-}
/* Calculate the ECC for a 256-byte block of data */
void yaffs_ecc_cacl(const unsigned char *data, unsigned char *ecc)
b = column_parity_table[*data++];
col_parity ^= b;
- if (b & 0x01) { /* odd number of bits in the byte */
+ if (b & 0x01) { /* odd number of bits in the byte */
line_parity ^= i;
line_parity_prime ^= ~i;
}
#endif
}
-
/* Correct the ECC on a 256 byte block of data */
int yaffs_ecc_correct(unsigned char *data, unsigned char *read_ecc,
- const unsigned char *test_ecc)
+ const unsigned char *test_ecc)
{
unsigned char d0, d1, d2; /* deltas */
d2 = read_ecc[2] ^ test_ecc[2];
if ((d0 | d1 | d2) == 0)
- return 0; /* no error */
+ return 0; /* no error */
if (((d0 ^ (d0 >> 1)) & 0x55) == 0x55 &&
((d1 ^ (d1 >> 1)) & 0x55) == 0x55 &&
data[byte] ^= (1 << bit);
- return 1; /* Corrected the error */
+ return 1; /* Corrected the error */
}
- if ((yaffs_count_bits(d0) +
- yaffs_count_bits(d1) +
- yaffs_count_bits(d2)) == 1) {
+ if ((hweight8(d0) + hweight8(d1) + hweight8(d2)) == 1) {
/* Reccoverable error in ecc */
read_ecc[0] = test_ecc[0];
read_ecc[1] = test_ecc[1];
read_ecc[2] = test_ecc[2];
- return 1; /* Corrected the error */
+ return 1; /* Corrected the error */
}
/* Unrecoverable error */
}
-
/*
* ECCxxxOther does ECC calcs on arbitrary n bytes of data
*/
void yaffs_ecc_calc_other(const unsigned char *data, unsigned n_bytes,
- struct yaffs_ecc_other *ecc_other)
+ struct yaffs_ecc_other *ecc_other)
{
unsigned int i;
b = column_parity_table[*data++];
col_parity ^= b;
- if (b & 0x01) {
+ if (b & 0x01) {
/* odd number of bits in the byte */
line_parity ^= i;
line_parity_prime ^= ~i;
}
int yaffs_ecc_correct_other(unsigned char *data, unsigned n_bytes,
- struct yaffs_ecc_other *read_ecc,
- const struct yaffs_ecc_other *test_ecc)
+ struct yaffs_ecc_other *read_ecc,
+ const struct yaffs_ecc_other *test_ecc)
{
unsigned char delta_col; /* column parity delta */
unsigned delta_line; /* line parity delta */
delta_col = read_ecc->col_parity ^ test_ecc->col_parity;
delta_line = read_ecc->line_parity ^ test_ecc->line_parity;
- delta_line_prime = read_ecc->line_parity_prime ^ test_ecc->line_parity_prime;
+ delta_line_prime =
+ read_ecc->line_parity_prime ^ test_ecc->line_parity_prime;
if ((delta_col | delta_line | delta_line_prime) == 0)
- return 0; /* no error */
+ return 0; /* no error */
if (delta_line == ~delta_line_prime &&
(((delta_col ^ (delta_col >> 1)) & 0x15) == 0x15)) {
data[delta_line] ^= (1 << bit);
- return 1; /* corrected */
+ return 1; /* corrected */
}
- if ((yaffs_count_bits32(delta_line) + yaffs_count_bits32(delta_line_prime) +
- yaffs_count_bits(delta_col)) == 1) {
+ if ((hweight32(delta_line) +
+ hweight32(delta_line_prime) +
+ hweight8(delta_col)) == 1) {
/* Reccoverable error in ecc */
*read_ecc = *test_ecc;
- return 1; /* corrected */
+ return 1; /* corrected */
}
/* Unrecoverable error */