diff options
Diffstat (limited to 'extra/mariabackup/crc/crc_glue.c')
-rw-r--r-- | extra/mariabackup/crc/crc_glue.c | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/extra/mariabackup/crc/crc_glue.c b/extra/mariabackup/crc/crc_glue.c new file mode 100644 index 00000000000..ae3fa91c1b0 --- /dev/null +++ b/extra/mariabackup/crc/crc_glue.c @@ -0,0 +1,72 @@ +/****************************************************** +Copyright (c) 2017 Percona LLC and/or its affiliates. + +Zlib compatible CRC-32 implementation. + +This program is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; version 2 of the License. + +This program is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +GNU General Public License for more details. + +You should have received a copy of the GNU General Public License +along with this program; if not, write to the Free Software +Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA + +*******************************************************/ + +#include "crc_glue.h" +#include "crc-intel-pclmul.h" +#include <stdint.h> +#include <string.h> +#include <zlib.h> + +#if __GNUC__ >= 4 && defined(__x86_64__) +static int pclmul_enabled = 0; +#endif + +#if defined(__GNUC__) && defined(__x86_64__) +static +uint32_t +cpuid(uint32_t* ecx, uint32_t* edx) +{ + uint32_t level; + + asm("cpuid" : "=a" (level) : "a" (0) : "ebx", "ecx", "edx"); + + if (level < 1) { + return level; + } + + asm("cpuid" : "=c" (*ecx), "=d" (*edx) + : "a" (1) + : "ebx"); + + return level; +} +#endif + +void crc_init() { +#if defined(__GNUC__) && defined(__x86_64__) + uint32_t ecx, edx; + + if (cpuid(&ecx, &edx) > 0) { + pclmul_enabled = ((ecx >> 19) & 1) && ((ecx >> 1) & 1); + } +#endif +} + +unsigned long crc32_iso3309(unsigned long crc, const unsigned char *buf, unsigned int len) +{ +#if __GNUC__ >= 4 && defined(__x86_64__) && defined(HAVE_CLMUL_INSTRUCTION) + if (pclmul_enabled) { + uint32_t crc_accum = crc ^ 0xffffffffL; + crc32_intel_pclmul(&crc_accum, buf, len); + return crc_accum ^ 0xffffffffL; + } +#endif + return crc32(crc, buf, len); +} |