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// 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 <asm/unaligned.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;
*mctx = get_unaligned_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 u32 crc32c_compute(u32 crc, const u8 *data, unsigned int len)
{
unsigned int n = -(uintptr_t)data & 7;
if (n) {
/* Data isn't 8-byte aligned. Align it. */
n = min(n, len);
crc = __crc32c_le(crc, data, n);
data += n;
len -= n;
}
n = len & ~7U;
if (n) {
crc32c_sparc64(&crc, (const u64 *)data, n);
data += n;
len -= n;
}
if (len)
crc = __crc32c_le(crc, data, len);
return crc;
}
static int crc32c_sparc64_update(struct shash_desc *desc, const u8 *data,
unsigned int len)
{
u32 *crcp = shash_desc_ctx(desc);
*crcp = crc32c_compute(*crcp, data, len);
return 0;
}
static int __crc32c_sparc64_finup(const u32 *crcp, const u8 *data,
unsigned int len, u8 *out)
{
put_unaligned_le32(~crc32c_compute(*crcp, data, len), out);
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);
put_unaligned_le32(~*crcp, out);
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_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"
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