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// SPDX-License-Identifier: GPL-2.0
/*
* crc32.c - CRC32 and CRC32C using LoongArch crc* instructions
*
* Module based on mips/crypto/crc32-mips.c
*
* Copyright (C) 2014 Linaro Ltd <yazen.ghannam@linaro.org>
* Copyright (C) 2018 MIPS Tech, LLC
* Copyright (C) 2020-2023 Loongson Technology Corporation Limited
*/
#include <linux/module.h>
#include <crypto/internal/hash.h>
#include <asm/cpu-features.h>
#include <asm/unaligned.h>
#define _CRC32(crc, value, size, type) \
do { \
__asm__ __volatile__( \
#type ".w." #size ".w" " %0, %1, %0\n\t"\
: "+r" (crc) \
: "r" (value) \
: "memory"); \
} while (0)
#define CRC32(crc, value, size) _CRC32(crc, value, size, crc)
#define CRC32C(crc, value, size) _CRC32(crc, value, size, crcc)
static u32 crc32_loongarch_hw(u32 crc_, const u8 *p, unsigned int len)
{
u32 crc = crc_;
while (len >= sizeof(u64)) {
u64 value = get_unaligned_le64(p);
CRC32(crc, value, d);
p += sizeof(u64);
len -= sizeof(u64);
}
if (len & sizeof(u32)) {
u32 value = get_unaligned_le32(p);
CRC32(crc, value, w);
p += sizeof(u32);
}
if (len & sizeof(u16)) {
u16 value = get_unaligned_le16(p);
CRC32(crc, value, h);
p += sizeof(u16);
}
if (len & sizeof(u8)) {
u8 value = *p++;
CRC32(crc, value, b);
}
return crc;
}
static u32 crc32c_loongarch_hw(u32 crc_, const u8 *p, unsigned int len)
{
u32 crc = crc_;
while (len >= sizeof(u64)) {
u64 value = get_unaligned_le64(p);
CRC32C(crc, value, d);
p += sizeof(u64);
len -= sizeof(u64);
}
if (len & sizeof(u32)) {
u32 value = get_unaligned_le32(p);
CRC32C(crc, value, w);
p += sizeof(u32);
}
if (len & sizeof(u16)) {
u16 value = get_unaligned_le16(p);
CRC32C(crc, value, h);
p += sizeof(u16);
}
if (len & sizeof(u8)) {
u8 value = *p++;
CRC32C(crc, value, b);
}
return crc;
}
#define CHKSUM_BLOCK_SIZE 1
#define CHKSUM_DIGEST_SIZE 4
struct chksum_ctx {
u32 key;
};
struct chksum_desc_ctx {
u32 crc;
};
static int chksum_init(struct shash_desc *desc)
{
struct chksum_ctx *mctx = crypto_shash_ctx(desc->tfm);
struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
ctx->crc = mctx->key;
return 0;
}
/*
* Setting the seed allows arbitrary accumulators and flexible XOR policy
* If your algorithm starts with ~0, then XOR with ~0 before you set the seed.
*/
static int chksum_setkey(struct crypto_shash *tfm, const u8 *key, unsigned int keylen)
{
struct chksum_ctx *mctx = crypto_shash_ctx(tfm);
if (keylen != sizeof(mctx->key))
return -EINVAL;
mctx->key = get_unaligned_le32(key);
return 0;
}
static int chksum_update(struct shash_desc *desc, const u8 *data, unsigned int length)
{
struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
ctx->crc = crc32_loongarch_hw(ctx->crc, data, length);
return 0;
}
static int chksumc_update(struct shash_desc *desc, const u8 *data, unsigned int length)
{
struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
ctx->crc = crc32c_loongarch_hw(ctx->crc, data, length);
return 0;
}
static int chksum_final(struct shash_desc *desc, u8 *out)
{
struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
put_unaligned_le32(ctx->crc, out);
return 0;
}
static int chksumc_final(struct shash_desc *desc, u8 *out)
{
struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
put_unaligned_le32(~ctx->crc, out);
return 0;
}
static int __chksum_finup(u32 crc, const u8 *data, unsigned int len, u8 *out)
{
put_unaligned_le32(crc32_loongarch_hw(crc, data, len), out);
return 0;
}
static int __chksumc_finup(u32 crc, const u8 *data, unsigned int len, u8 *out)
{
put_unaligned_le32(~crc32c_loongarch_hw(crc, data, len), out);
return 0;
}
static int chksum_finup(struct shash_desc *desc, const u8 *data, unsigned int len, u8 *out)
{
struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
return __chksum_finup(ctx->crc, data, len, out);
}
static int chksumc_finup(struct shash_desc *desc, const u8 *data, unsigned int len, u8 *out)
{
struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
return __chksumc_finup(ctx->crc, data, len, out);
}
static int chksum_digest(struct shash_desc *desc, const u8 *data, unsigned int length, u8 *out)
{
struct chksum_ctx *mctx = crypto_shash_ctx(desc->tfm);
return __chksum_finup(mctx->key, data, length, out);
}
static int chksumc_digest(struct shash_desc *desc, const u8 *data, unsigned int length, u8 *out)
{
struct chksum_ctx *mctx = crypto_shash_ctx(desc->tfm);
return __chksumc_finup(mctx->key, data, length, out);
}
static int chksum_cra_init(struct crypto_tfm *tfm)
{
struct chksum_ctx *mctx = crypto_tfm_ctx(tfm);
mctx->key = 0;
return 0;
}
static int chksumc_cra_init(struct crypto_tfm *tfm)
{
struct chksum_ctx *mctx = crypto_tfm_ctx(tfm);
mctx->key = ~0;
return 0;
}
static struct shash_alg crc32_alg = {
.digestsize = CHKSUM_DIGEST_SIZE,
.setkey = chksum_setkey,
.init = chksum_init,
.update = chksum_update,
.final = chksum_final,
.finup = chksum_finup,
.digest = chksum_digest,
.descsize = sizeof(struct chksum_desc_ctx),
.base = {
.cra_name = "crc32",
.cra_driver_name = "crc32-loongarch",
.cra_priority = 300,
.cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
.cra_blocksize = CHKSUM_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct chksum_ctx),
.cra_module = THIS_MODULE,
.cra_init = chksum_cra_init,
}
};
static struct shash_alg crc32c_alg = {
.digestsize = CHKSUM_DIGEST_SIZE,
.setkey = chksum_setkey,
.init = chksum_init,
.update = chksumc_update,
.final = chksumc_final,
.finup = chksumc_finup,
.digest = chksumc_digest,
.descsize = sizeof(struct chksum_desc_ctx),
.base = {
.cra_name = "crc32c",
.cra_driver_name = "crc32c-loongarch",
.cra_priority = 300,
.cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
.cra_blocksize = CHKSUM_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct chksum_ctx),
.cra_module = THIS_MODULE,
.cra_init = chksumc_cra_init,
}
};
static int __init crc32_mod_init(void)
{
int err;
if (!cpu_has(CPU_FEATURE_CRC32))
return 0;
err = crypto_register_shash(&crc32_alg);
if (err)
return err;
err = crypto_register_shash(&crc32c_alg);
if (err)
return err;
return 0;
}
static void __exit crc32_mod_exit(void)
{
if (!cpu_has(CPU_FEATURE_CRC32))
return;
crypto_unregister_shash(&crc32_alg);
crypto_unregister_shash(&crc32c_alg);
}
module_init(crc32_mod_init);
module_exit(crc32_mod_exit);
MODULE_AUTHOR("Min Zhou <zhoumin@loongson.cn>");
MODULE_AUTHOR("Huacai Chen <chenhuacai@loongson.cn>");
MODULE_DESCRIPTION("CRC32 and CRC32C using LoongArch crc* instructions");
MODULE_LICENSE("GPL v2");
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