183 lines
4.1 KiB
C
183 lines
4.1 KiB
C
/* Glue code for CRC32C optimized for sparc64 crypto opcodes.
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*
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* This is based largely upon arch/x86/crypto/crc32c-intel.c
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*
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* Copyright (C) 2008 Intel Corporation
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* Authors: Austin Zhang <austin_zhang@linux.intel.com>
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* Kent Liu <kent.liu@intel.com>
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/kernel.h>
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#include <linux/crc32.h>
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#include <crypto/internal/hash.h>
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#include <asm/pstate.h>
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#include <asm/elf.h>
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#include "opcodes.h"
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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 crc32c_sparc64_setkey(struct crypto_shash *hash, const u8 *key,
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unsigned int keylen)
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{
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u32 *mctx = crypto_shash_ctx(hash);
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if (keylen != sizeof(u32)) {
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crypto_shash_set_flags(hash, CRYPTO_TFM_RES_BAD_KEY_LEN);
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return -EINVAL;
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}
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*(__le32 *)mctx = le32_to_cpup((__le32 *)key);
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return 0;
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}
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static int crc32c_sparc64_init(struct shash_desc *desc)
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{
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u32 *mctx = crypto_shash_ctx(desc->tfm);
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u32 *crcp = shash_desc_ctx(desc);
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*crcp = *mctx;
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return 0;
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}
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extern void crc32c_sparc64(u32 *crcp, const u64 *data, unsigned int len);
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static void crc32c_compute(u32 *crcp, const u64 *data, unsigned int len)
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{
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unsigned int asm_len;
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asm_len = len & ~7U;
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if (asm_len) {
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crc32c_sparc64(crcp, data, asm_len);
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data += asm_len / 8;
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len -= asm_len;
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}
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if (len)
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*crcp = __crc32c_le(*crcp, (const unsigned char *) data, len);
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}
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static int crc32c_sparc64_update(struct shash_desc *desc, const u8 *data,
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unsigned int len)
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{
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u32 *crcp = shash_desc_ctx(desc);
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crc32c_compute(crcp, (const u64 *) data, len);
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return 0;
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}
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static int __crc32c_sparc64_finup(u32 *crcp, const u8 *data, unsigned int len,
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u8 *out)
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{
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u32 tmp = *crcp;
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crc32c_compute(&tmp, (const u64 *) data, len);
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*(__le32 *) out = ~cpu_to_le32(tmp);
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return 0;
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}
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static int crc32c_sparc64_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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return __crc32c_sparc64_finup(shash_desc_ctx(desc), data, len, out);
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}
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static int crc32c_sparc64_final(struct shash_desc *desc, u8 *out)
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{
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u32 *crcp = shash_desc_ctx(desc);
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*(__le32 *) out = ~cpu_to_le32p(crcp);
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return 0;
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}
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static int crc32c_sparc64_digest(struct shash_desc *desc, const u8 *data,
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unsigned int len, u8 *out)
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{
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return __crc32c_sparc64_finup(crypto_shash_ctx(desc->tfm), data, len,
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out);
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}
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static int crc32c_sparc64_cra_init(struct crypto_tfm *tfm)
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{
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u32 *key = crypto_tfm_ctx(tfm);
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*key = ~0;
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return 0;
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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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static struct shash_alg alg = {
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.setkey = crc32c_sparc64_setkey,
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.init = crc32c_sparc64_init,
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.update = crc32c_sparc64_update,
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.final = crc32c_sparc64_final,
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.finup = crc32c_sparc64_finup,
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.digest = crc32c_sparc64_digest,
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.descsize = sizeof(u32),
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.digestsize = CHKSUM_DIGEST_SIZE,
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.base = {
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.cra_name = "crc32c",
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.cra_driver_name = "crc32c-sparc64",
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.cra_priority = SPARC_CR_OPCODE_PRIORITY,
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.cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
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.cra_blocksize = CHKSUM_BLOCK_SIZE,
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.cra_ctxsize = sizeof(u32),
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.cra_alignmask = 7,
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.cra_module = THIS_MODULE,
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.cra_init = crc32c_sparc64_cra_init,
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}
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};
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static bool __init sparc64_has_crc32c_opcode(void)
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{
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unsigned long cfr;
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if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO))
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return false;
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__asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
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if (!(cfr & CFR_CRC32C))
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return false;
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return true;
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}
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static int __init crc32c_sparc64_mod_init(void)
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{
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if (sparc64_has_crc32c_opcode()) {
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pr_info("Using sparc64 crc32c opcode optimized CRC32C implementation\n");
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return crypto_register_shash(&alg);
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}
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pr_info("sparc64 crc32c opcode not available.\n");
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return -ENODEV;
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}
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static void __exit crc32c_sparc64_mod_fini(void)
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{
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crypto_unregister_shash(&alg);
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}
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module_init(crc32c_sparc64_mod_init);
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module_exit(crc32c_sparc64_mod_fini);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("CRC32c (Castagnoli), sparc64 crc32c opcode accelerated");
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MODULE_ALIAS_CRYPTO("crc32c");
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#include "crop_devid.c"
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