275 lines
6.9 KiB
C
275 lines
6.9 KiB
C
/*
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* crc32-arm64.c - CRC32 and CRC32C using optional ARMv8 instructions
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*
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* Module based on crypto/crc32c_generic.c
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*
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* CRC32 loop taken from Ed Nevill's Hadoop CRC patch
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* http://mail-archives.apache.org/mod_mbox/hadoop-common-dev/201406.mbox/%3C1403687030.3355.19.camel%40localhost.localdomain%3E
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*
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* Using inline assembly instead of intrinsics in order to be backwards
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* compatible with older compilers.
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*
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* Copyright (C) 2014 Linaro Ltd <yazen.ghannam@linaro.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/unaligned/access_ok.h>
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#include <linux/cpufeature.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/string.h>
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#include <crypto/internal/hash.h>
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MODULE_AUTHOR("Yazen Ghannam <yazen.ghannam@linaro.org>");
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MODULE_DESCRIPTION("CRC32 and CRC32C using optional ARMv8 instructions");
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MODULE_LICENSE("GPL v2");
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#define CRC32X(crc, value) __asm__("crc32x %w[c], %w[c], %x[v]":[c]"+r"(crc):[v]"r"(value))
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#define CRC32W(crc, value) __asm__("crc32w %w[c], %w[c], %w[v]":[c]"+r"(crc):[v]"r"(value))
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#define CRC32H(crc, value) __asm__("crc32h %w[c], %w[c], %w[v]":[c]"+r"(crc):[v]"r"(value))
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#define CRC32B(crc, value) __asm__("crc32b %w[c], %w[c], %w[v]":[c]"+r"(crc):[v]"r"(value))
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#define CRC32CX(crc, value) __asm__("crc32cx %w[c], %w[c], %x[v]":[c]"+r"(crc):[v]"r"(value))
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#define CRC32CW(crc, value) __asm__("crc32cw %w[c], %w[c], %w[v]":[c]"+r"(crc):[v]"r"(value))
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#define CRC32CH(crc, value) __asm__("crc32ch %w[c], %w[c], %w[v]":[c]"+r"(crc):[v]"r"(value))
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#define CRC32CB(crc, value) __asm__("crc32cb %w[c], %w[c], %w[v]":[c]"+r"(crc):[v]"r"(value))
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static u32 crc32_arm64_le_hw(u32 crc, const u8 *p, unsigned int len)
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{
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s64 length = len;
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while ((length -= sizeof(u64)) >= 0) {
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CRC32X(crc, get_unaligned_le64(p));
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p += sizeof(u64);
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}
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/* The following is more efficient than the straight loop */
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if (length & sizeof(u32)) {
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CRC32W(crc, get_unaligned_le32(p));
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p += sizeof(u32);
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}
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if (length & sizeof(u16)) {
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CRC32H(crc, get_unaligned_le16(p));
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p += sizeof(u16);
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}
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if (length & sizeof(u8))
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CRC32B(crc, *p);
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return crc;
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}
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static u32 crc32c_arm64_le_hw(u32 crc, const u8 *p, unsigned int len)
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{
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s64 length = len;
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while ((length -= sizeof(u64)) >= 0) {
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CRC32CX(crc, get_unaligned_le64(p));
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p += sizeof(u64);
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}
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/* The following is more efficient than the straight loop */
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if (length & sizeof(u32)) {
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CRC32CW(crc, get_unaligned_le32(p));
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p += sizeof(u32);
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}
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if (length & sizeof(u16)) {
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CRC32CH(crc, get_unaligned_le16(p));
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p += sizeof(u16);
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}
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if (length & sizeof(u8))
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CRC32CB(crc, *p);
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return crc;
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}
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#define CHKSUM_BLOCK_SIZE 1
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#define CHKSUM_DIGEST_SIZE 4
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struct chksum_ctx {
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u32 key;
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};
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struct chksum_desc_ctx {
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u32 crc;
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};
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static int chksum_init(struct shash_desc *desc)
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{
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struct chksum_ctx *mctx = crypto_shash_ctx(desc->tfm);
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struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
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ctx->crc = mctx->key;
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return 0;
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}
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/*
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* Setting the seed allows arbitrary accumulators and flexible XOR policy
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* If your algorithm starts with ~0, then XOR with ~0 before you set
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* the seed.
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*/
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static int chksum_setkey(struct crypto_shash *tfm, const u8 *key,
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unsigned int keylen)
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{
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struct chksum_ctx *mctx = crypto_shash_ctx(tfm);
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if (keylen != sizeof(mctx->key)) {
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crypto_shash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
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return -EINVAL;
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}
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mctx->key = get_unaligned_le32(key);
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return 0;
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}
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static int chksum_update(struct shash_desc *desc, const u8 *data,
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unsigned int length)
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{
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struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
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ctx->crc = crc32_arm64_le_hw(ctx->crc, data, length);
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return 0;
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}
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static int chksumc_update(struct shash_desc *desc, const u8 *data,
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unsigned int length)
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{
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struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
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ctx->crc = crc32c_arm64_le_hw(ctx->crc, data, length);
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return 0;
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}
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static int chksum_final(struct shash_desc *desc, u8 *out)
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{
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struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
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put_unaligned_le32(~ctx->crc, out);
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return 0;
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}
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static int __chksum_finup(u32 crc, const u8 *data, unsigned int len, u8 *out)
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{
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put_unaligned_le32(~crc32_arm64_le_hw(crc, data, len), out);
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return 0;
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}
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static int __chksumc_finup(u32 crc, const u8 *data, unsigned int len, u8 *out)
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{
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put_unaligned_le32(~crc32c_arm64_le_hw(crc, data, len), out);
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return 0;
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}
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static int chksum_finup(struct shash_desc *desc, const u8 *data,
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unsigned int len, u8 *out)
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{
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struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
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return __chksum_finup(ctx->crc, data, len, out);
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}
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static int chksumc_finup(struct shash_desc *desc, const u8 *data,
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unsigned int len, u8 *out)
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{
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struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
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return __chksumc_finup(ctx->crc, data, len, out);
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}
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static int chksum_digest(struct shash_desc *desc, const u8 *data,
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unsigned int length, u8 *out)
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{
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struct chksum_ctx *mctx = crypto_shash_ctx(desc->tfm);
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return __chksum_finup(mctx->key, data, length, out);
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}
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static int chksumc_digest(struct shash_desc *desc, const u8 *data,
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unsigned int length, u8 *out)
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{
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struct chksum_ctx *mctx = crypto_shash_ctx(desc->tfm);
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return __chksumc_finup(mctx->key, data, length, out);
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}
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static int crc32_cra_init(struct crypto_tfm *tfm)
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{
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struct chksum_ctx *mctx = crypto_tfm_ctx(tfm);
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mctx->key = ~0;
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return 0;
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}
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static struct shash_alg crc32_alg = {
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.digestsize = CHKSUM_DIGEST_SIZE,
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.setkey = chksum_setkey,
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.init = chksum_init,
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.update = chksum_update,
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.final = chksum_final,
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.finup = chksum_finup,
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.digest = chksum_digest,
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.descsize = sizeof(struct chksum_desc_ctx),
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.base = {
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.cra_name = "crc32",
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.cra_driver_name = "crc32-arm64-hw",
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.cra_priority = 300,
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.cra_blocksize = CHKSUM_BLOCK_SIZE,
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.cra_alignmask = 0,
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.cra_ctxsize = sizeof(struct chksum_ctx),
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.cra_module = THIS_MODULE,
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.cra_init = crc32_cra_init,
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}
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};
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static struct shash_alg crc32c_alg = {
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.digestsize = CHKSUM_DIGEST_SIZE,
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.setkey = chksum_setkey,
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.init = chksum_init,
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.update = chksumc_update,
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.final = chksum_final,
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.finup = chksumc_finup,
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.digest = chksumc_digest,
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.descsize = sizeof(struct chksum_desc_ctx),
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.base = {
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.cra_name = "crc32c",
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.cra_driver_name = "crc32c-arm64-hw",
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.cra_priority = 300,
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.cra_blocksize = CHKSUM_BLOCK_SIZE,
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.cra_alignmask = 0,
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.cra_ctxsize = sizeof(struct chksum_ctx),
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.cra_module = THIS_MODULE,
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.cra_init = crc32_cra_init,
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}
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};
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static int __init crc32_mod_init(void)
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{
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int err;
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err = crypto_register_shash(&crc32_alg);
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if (err)
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return err;
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err = crypto_register_shash(&crc32c_alg);
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if (err) {
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crypto_unregister_shash(&crc32_alg);
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return err;
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}
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return 0;
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}
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static void __exit crc32_mod_exit(void)
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{
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crypto_unregister_shash(&crc32_alg);
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crypto_unregister_shash(&crc32c_alg);
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}
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module_cpu_feature_match(CRC32, crc32_mod_init);
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module_exit(crc32_mod_exit);
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