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Vendor Unique iSCSI CRC32C

August 2016 Data Integrity Validation 263

if ((length = len / CRC32C_SIZE) > 0) {

#if defined(__amd64) || defined(__x86_64)

uint64_t *data = (uint64_t *)addr;

#else

uint32_t *data = (uint32_t *)addr;

#endif

for (i = 0; i < length; i++) {

__asm__ __volatile__(

/* "crc32 r32, r/m32" or "crc32 r32,

r/m64" */

".byte 0xF2, " CRC32C_INST

"0x0F, 0x38, 0xF1, 0xF1"

: "=S"(crc)

: "0"(crc), "c"(*data));

data++;

}

addr = (uint8_t *)data;

len -= length * CRC32C_SIZE;

}

/* calc crc for remaining data */

for (i = 0; i < len; i++) {

__asm__ __volatile__(

/* "crc32 r32, r/m8" */

".byte 0xF2, 0x0F, 0x38, 0xF0, 0xF1"

: "=S"(crc)

: "0"(crc), "c"(*addr));

addr++;

}

return (crc ^ CRC32C_XOR);

}

#endif

Sparc (T4 Minimum)

#if defined(__sparc)

uint32_t

calc_crc32c_sparc(char *buf, int len, uint32_t crc)

{

uint8_t *addr = (uint8_t *)buf;

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