1 // SPDX-License-Identifier: GPL-2.0-only 2 /* Glue code for CRC32C optimized for sparc64 crypto opcodes. 3 * 4 * This is based largely upon arch/x86/crypto/crc32c-intel.c 5 * 6 * Copyright (C) 2008 Intel Corporation 7 * Authors: Austin Zhang <austin_zhang@linux.intel.com> 8 * Kent Liu <kent.liu@intel.com> 9 */ 10 11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 12 13 #include <linux/init.h> 14 #include <linux/module.h> 15 #include <linux/string.h> 16 #include <linux/kernel.h> 17 #include <linux/crc32.h> 18 19 #include <crypto/internal/hash.h> 20 21 #include <asm/pstate.h> 22 #include <asm/elf.h> 23 24 #include "opcodes.h" 25 26 /* 27 * Setting the seed allows arbitrary accumulators and flexible XOR policy 28 * If your algorithm starts with ~0, then XOR with ~0 before you set 29 * the seed. 30 */ 31 static int crc32c_sparc64_setkey(struct crypto_shash *hash, const u8 *key, 32 unsigned int keylen) 33 { 34 u32 *mctx = crypto_shash_ctx(hash); 35 36 if (keylen != sizeof(u32)) { 37 crypto_shash_set_flags(hash, CRYPTO_TFM_RES_BAD_KEY_LEN); 38 return -EINVAL; 39 } 40 *(__le32 *)mctx = le32_to_cpup((__le32 *)key); 41 return 0; 42 } 43 44 static int crc32c_sparc64_init(struct shash_desc *desc) 45 { 46 u32 *mctx = crypto_shash_ctx(desc->tfm); 47 u32 *crcp = shash_desc_ctx(desc); 48 49 *crcp = *mctx; 50 51 return 0; 52 } 53 54 extern void crc32c_sparc64(u32 *crcp, const u64 *data, unsigned int len); 55 56 static void crc32c_compute(u32 *crcp, const u64 *data, unsigned int len) 57 { 58 unsigned int asm_len; 59 60 asm_len = len & ~7U; 61 if (asm_len) { 62 crc32c_sparc64(crcp, data, asm_len); 63 data += asm_len / 8; 64 len -= asm_len; 65 } 66 if (len) 67 *crcp = __crc32c_le(*crcp, (const unsigned char *) data, len); 68 } 69 70 static int crc32c_sparc64_update(struct shash_desc *desc, const u8 *data, 71 unsigned int len) 72 { 73 u32 *crcp = shash_desc_ctx(desc); 74 75 crc32c_compute(crcp, (const u64 *) data, len); 76 77 return 0; 78 } 79 80 static int __crc32c_sparc64_finup(u32 *crcp, const u8 *data, unsigned int len, 81 u8 *out) 82 { 83 u32 tmp = *crcp; 84 85 crc32c_compute(&tmp, (const u64 *) data, len); 86 87 *(__le32 *) out = ~cpu_to_le32(tmp); 88 return 0; 89 } 90 91 static int crc32c_sparc64_finup(struct shash_desc *desc, const u8 *data, 92 unsigned int len, u8 *out) 93 { 94 return __crc32c_sparc64_finup(shash_desc_ctx(desc), data, len, out); 95 } 96 97 static int crc32c_sparc64_final(struct shash_desc *desc, u8 *out) 98 { 99 u32 *crcp = shash_desc_ctx(desc); 100 101 *(__le32 *) out = ~cpu_to_le32p(crcp); 102 return 0; 103 } 104 105 static int crc32c_sparc64_digest(struct shash_desc *desc, const u8 *data, 106 unsigned int len, u8 *out) 107 { 108 return __crc32c_sparc64_finup(crypto_shash_ctx(desc->tfm), data, len, 109 out); 110 } 111 112 static int crc32c_sparc64_cra_init(struct crypto_tfm *tfm) 113 { 114 u32 *key = crypto_tfm_ctx(tfm); 115 116 *key = ~0; 117 118 return 0; 119 } 120 121 #define CHKSUM_BLOCK_SIZE 1 122 #define CHKSUM_DIGEST_SIZE 4 123 124 static struct shash_alg alg = { 125 .setkey = crc32c_sparc64_setkey, 126 .init = crc32c_sparc64_init, 127 .update = crc32c_sparc64_update, 128 .final = crc32c_sparc64_final, 129 .finup = crc32c_sparc64_finup, 130 .digest = crc32c_sparc64_digest, 131 .descsize = sizeof(u32), 132 .digestsize = CHKSUM_DIGEST_SIZE, 133 .base = { 134 .cra_name = "crc32c", 135 .cra_driver_name = "crc32c-sparc64", 136 .cra_priority = SPARC_CR_OPCODE_PRIORITY, 137 .cra_flags = CRYPTO_ALG_OPTIONAL_KEY, 138 .cra_blocksize = CHKSUM_BLOCK_SIZE, 139 .cra_ctxsize = sizeof(u32), 140 .cra_alignmask = 7, 141 .cra_module = THIS_MODULE, 142 .cra_init = crc32c_sparc64_cra_init, 143 } 144 }; 145 146 static bool __init sparc64_has_crc32c_opcode(void) 147 { 148 unsigned long cfr; 149 150 if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO)) 151 return false; 152 153 __asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr)); 154 if (!(cfr & CFR_CRC32C)) 155 return false; 156 157 return true; 158 } 159 160 static int __init crc32c_sparc64_mod_init(void) 161 { 162 if (sparc64_has_crc32c_opcode()) { 163 pr_info("Using sparc64 crc32c opcode optimized CRC32C implementation\n"); 164 return crypto_register_shash(&alg); 165 } 166 pr_info("sparc64 crc32c opcode not available.\n"); 167 return -ENODEV; 168 } 169 170 static void __exit crc32c_sparc64_mod_fini(void) 171 { 172 crypto_unregister_shash(&alg); 173 } 174 175 module_init(crc32c_sparc64_mod_init); 176 module_exit(crc32c_sparc64_mod_fini); 177 178 MODULE_LICENSE("GPL"); 179 MODULE_DESCRIPTION("CRC32c (Castagnoli), sparc64 crc32c opcode accelerated"); 180 181 MODULE_ALIAS_CRYPTO("crc32c"); 182 183 #include "crop_devid.c" 184