5 * Based on a posting to lkml by Austin Zhang <austin.zhang@intel.com>
7 * Using hardware provided CRC32 instruction to accelerate the CRC32 disposal.
8 * CRC32C polynomial:0x1EDC6F41(BE)/0x82F63B78(LE)
9 * CRC32 is a new instruction in Intel SSE4.2, the reference can be found at:
10 * http://www.intel.com/products/processor/manuals/
11 * Intel(R) 64 and IA-32 Architectures Software Developer's Manual
12 * Volume 2A: Instruction Set Reference, A-M
17 #if BITS_PER_LONG == 64
18 #define REX_PRE "0x48, "
25 uint32_t crc32c_intel_le_hw_byte(uint32_t crc, unsigned char const *data,
30 ".byte 0xf2, 0xf, 0x38, 0xf0, 0xf1"
41 * Steps through buffer one byte at at time, calculates reflected
44 uint32_t crc32c_intel(unsigned char const *data, unsigned long length)
46 unsigned int iquotient = length / SCALE_F;
47 unsigned int iremainder = length % SCALE_F;
48 #if BITS_PER_LONG == 64
49 uint64_t *ptmp = (uint64_t *) data;
51 uint32_t *ptmp = (uint32_t *) data;
57 ".byte 0xf2, " REX_PRE "0xf, 0x38, 0xf1, 0xf1;"
65 crc = crc32c_intel_le_hw_byte(crc, (unsigned char *)ptmp,
71 #endif /* ARCH_HAVE_SSE */