182 lines
4.1 KiB
C
182 lines
4.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/* Glue code for CRC32C optimized for sparc64 crypto opcodes.
|
|
*
|
|
* This is based largely upon arch/x86/crypto/crc32c-intel.c
|
|
*
|
|
* Copyright (C) 2008 Intel Corporation
|
|
* Authors: Austin Zhang <austin_zhang@linux.intel.com>
|
|
* Kent Liu <kent.liu@intel.com>
|
|
*/
|
|
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/module.h>
|
|
#include <linux/string.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/crc32.h>
|
|
|
|
#include <crypto/internal/hash.h>
|
|
|
|
#include <asm/pstate.h>
|
|
#include <asm/elf.h>
|
|
|
|
#include "opcodes.h"
|
|
|
|
/*
|
|
* 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 crc32c_sparc64_setkey(struct crypto_shash *hash, const u8 *key,
|
|
unsigned int keylen)
|
|
{
|
|
u32 *mctx = crypto_shash_ctx(hash);
|
|
|
|
if (keylen != sizeof(u32))
|
|
return -EINVAL;
|
|
*(__le32 *)mctx = le32_to_cpup((__le32 *)key);
|
|
return 0;
|
|
}
|
|
|
|
static int crc32c_sparc64_init(struct shash_desc *desc)
|
|
{
|
|
u32 *mctx = crypto_shash_ctx(desc->tfm);
|
|
u32 *crcp = shash_desc_ctx(desc);
|
|
|
|
*crcp = *mctx;
|
|
|
|
return 0;
|
|
}
|
|
|
|
extern void crc32c_sparc64(u32 *crcp, const u64 *data, unsigned int len);
|
|
|
|
static void crc32c_compute(u32 *crcp, const u64 *data, unsigned int len)
|
|
{
|
|
unsigned int asm_len;
|
|
|
|
asm_len = len & ~7U;
|
|
if (asm_len) {
|
|
crc32c_sparc64(crcp, data, asm_len);
|
|
data += asm_len / 8;
|
|
len -= asm_len;
|
|
}
|
|
if (len)
|
|
*crcp = __crc32c_le(*crcp, (const unsigned char *) data, len);
|
|
}
|
|
|
|
static int crc32c_sparc64_update(struct shash_desc *desc, const u8 *data,
|
|
unsigned int len)
|
|
{
|
|
u32 *crcp = shash_desc_ctx(desc);
|
|
|
|
crc32c_compute(crcp, (const u64 *) data, len);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __crc32c_sparc64_finup(u32 *crcp, const u8 *data, unsigned int len,
|
|
u8 *out)
|
|
{
|
|
u32 tmp = *crcp;
|
|
|
|
crc32c_compute(&tmp, (const u64 *) data, len);
|
|
|
|
*(__le32 *) out = ~cpu_to_le32(tmp);
|
|
return 0;
|
|
}
|
|
|
|
static int crc32c_sparc64_finup(struct shash_desc *desc, const u8 *data,
|
|
unsigned int len, u8 *out)
|
|
{
|
|
return __crc32c_sparc64_finup(shash_desc_ctx(desc), data, len, out);
|
|
}
|
|
|
|
static int crc32c_sparc64_final(struct shash_desc *desc, u8 *out)
|
|
{
|
|
u32 *crcp = shash_desc_ctx(desc);
|
|
|
|
*(__le32 *) out = ~cpu_to_le32p(crcp);
|
|
return 0;
|
|
}
|
|
|
|
static int crc32c_sparc64_digest(struct shash_desc *desc, const u8 *data,
|
|
unsigned int len, u8 *out)
|
|
{
|
|
return __crc32c_sparc64_finup(crypto_shash_ctx(desc->tfm), data, len,
|
|
out);
|
|
}
|
|
|
|
static int crc32c_sparc64_cra_init(struct crypto_tfm *tfm)
|
|
{
|
|
u32 *key = crypto_tfm_ctx(tfm);
|
|
|
|
*key = ~0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
#define CHKSUM_BLOCK_SIZE 1
|
|
#define CHKSUM_DIGEST_SIZE 4
|
|
|
|
static struct shash_alg alg = {
|
|
.setkey = crc32c_sparc64_setkey,
|
|
.init = crc32c_sparc64_init,
|
|
.update = crc32c_sparc64_update,
|
|
.final = crc32c_sparc64_final,
|
|
.finup = crc32c_sparc64_finup,
|
|
.digest = crc32c_sparc64_digest,
|
|
.descsize = sizeof(u32),
|
|
.digestsize = CHKSUM_DIGEST_SIZE,
|
|
.base = {
|
|
.cra_name = "crc32c",
|
|
.cra_driver_name = "crc32c-sparc64",
|
|
.cra_priority = SPARC_CR_OPCODE_PRIORITY,
|
|
.cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
|
|
.cra_blocksize = CHKSUM_BLOCK_SIZE,
|
|
.cra_ctxsize = sizeof(u32),
|
|
.cra_alignmask = 7,
|
|
.cra_module = THIS_MODULE,
|
|
.cra_init = crc32c_sparc64_cra_init,
|
|
}
|
|
};
|
|
|
|
static bool __init sparc64_has_crc32c_opcode(void)
|
|
{
|
|
unsigned long cfr;
|
|
|
|
if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO))
|
|
return false;
|
|
|
|
__asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
|
|
if (!(cfr & CFR_CRC32C))
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
static int __init crc32c_sparc64_mod_init(void)
|
|
{
|
|
if (sparc64_has_crc32c_opcode()) {
|
|
pr_info("Using sparc64 crc32c opcode optimized CRC32C implementation\n");
|
|
return crypto_register_shash(&alg);
|
|
}
|
|
pr_info("sparc64 crc32c opcode not available.\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
static void __exit crc32c_sparc64_mod_fini(void)
|
|
{
|
|
crypto_unregister_shash(&alg);
|
|
}
|
|
|
|
module_init(crc32c_sparc64_mod_init);
|
|
module_exit(crc32c_sparc64_mod_fini);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("CRC32c (Castagnoli), sparc64 crc32c opcode accelerated");
|
|
|
|
MODULE_ALIAS_CRYPTO("crc32c");
|
|
|
|
#include "crop_devid.c"
|