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 return -EINVAL; 38 *(__le32 *)mctx = le32_to_cpup((__le32 *)key); 39 return 0; 40 } 41 42 static int crc32c_sparc64_init(struct shash_desc *desc) 43 { 44 u32 *mctx = crypto_shash_ctx(desc->tfm); 45 u32 *crcp = shash_desc_ctx(desc); 46 47 *crcp = *mctx; 48 49 return 0; 50 } 51 52 extern void crc32c_sparc64(u32 *crcp, const u64 *data, unsigned int len); 53 54 static void crc32c_compute(u32 *crcp, const u64 *data, unsigned int len) 55 { 56 unsigned int asm_len; 57 58 asm_len = len & ~7U; 59 if (asm_len) { 60 crc32c_sparc64(crcp, data, asm_len); 61 data += asm_len / 8; 62 len -= asm_len; 63 } 64 if (len) 65 *crcp = __crc32c_le(*crcp, (const unsigned char *) data, len); 66 } 67 68 static int crc32c_sparc64_update(struct shash_desc *desc, const u8 *data, 69 unsigned int len) 70 { 71 u32 *crcp = shash_desc_ctx(desc); 72 73 crc32c_compute(crcp, (const u64 *) data, len); 74 75 return 0; 76 } 77 78 static int __crc32c_sparc64_finup(u32 *crcp, const u8 *data, unsigned int len, 79 u8 *out) 80 { 81 u32 tmp = *crcp; 82 83 crc32c_compute(&tmp, (const u64 *) data, len); 84 85 *(__le32 *) out = ~cpu_to_le32(tmp); 86 return 0; 87 } 88 89 static int crc32c_sparc64_finup(struct shash_desc *desc, const u8 *data, 90 unsigned int len, u8 *out) 91 { 92 return __crc32c_sparc64_finup(shash_desc_ctx(desc), data, len, out); 93 } 94 95 static int crc32c_sparc64_final(struct shash_desc *desc, u8 *out) 96 { 97 u32 *crcp = shash_desc_ctx(desc); 98 99 *(__le32 *) out = ~cpu_to_le32p(crcp); 100 return 0; 101 } 102 103 static int crc32c_sparc64_digest(struct shash_desc *desc, const u8 *data, 104 unsigned int len, u8 *out) 105 { 106 return __crc32c_sparc64_finup(crypto_shash_ctx(desc->tfm), data, len, 107 out); 108 } 109 110 static int crc32c_sparc64_cra_init(struct crypto_tfm *tfm) 111 { 112 u32 *key = crypto_tfm_ctx(tfm); 113 114 *key = ~0; 115 116 return 0; 117 } 118 119 #define CHKSUM_BLOCK_SIZE 1 120 #define CHKSUM_DIGEST_SIZE 4 121 122 static struct shash_alg alg = { 123 .setkey = crc32c_sparc64_setkey, 124 .init = crc32c_sparc64_init, 125 .update = crc32c_sparc64_update, 126 .final = crc32c_sparc64_final, 127 .finup = crc32c_sparc64_finup, 128 .digest = crc32c_sparc64_digest, 129 .descsize = sizeof(u32), 130 .digestsize = CHKSUM_DIGEST_SIZE, 131 .base = { 132 .cra_name = "crc32c", 133 .cra_driver_name = "crc32c-sparc64", 134 .cra_priority = SPARC_CR_OPCODE_PRIORITY, 135 .cra_flags = CRYPTO_ALG_OPTIONAL_KEY, 136 .cra_blocksize = CHKSUM_BLOCK_SIZE, 137 .cra_ctxsize = sizeof(u32), 138 .cra_alignmask = 7, 139 .cra_module = THIS_MODULE, 140 .cra_init = crc32c_sparc64_cra_init, 141 } 142 }; 143 144 static bool __init sparc64_has_crc32c_opcode(void) 145 { 146 unsigned long cfr; 147 148 if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO)) 149 return false; 150 151 __asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr)); 152 if (!(cfr & CFR_CRC32C)) 153 return false; 154 155 return true; 156 } 157 158 static int __init crc32c_sparc64_mod_init(void) 159 { 160 if (sparc64_has_crc32c_opcode()) { 161 pr_info("Using sparc64 crc32c opcode optimized CRC32C implementation\n"); 162 return crypto_register_shash(&alg); 163 } 164 pr_info("sparc64 crc32c opcode not available.\n"); 165 return -ENODEV; 166 } 167 168 static void __exit crc32c_sparc64_mod_fini(void) 169 { 170 crypto_unregister_shash(&alg); 171 } 172 173 module_init(crc32c_sparc64_mod_init); 174 module_exit(crc32c_sparc64_mod_fini); 175 176 MODULE_LICENSE("GPL"); 177 MODULE_DESCRIPTION("CRC32c (Castagnoli), sparc64 crc32c opcode accelerated"); 178 179 MODULE_ALIAS_CRYPTO("crc32c"); 180 181 #include "crop_devid.c" 182