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 #include <asm/unaligned.h> 24 25 #include "opcodes.h" 26 27 /* 28 * Setting the seed allows arbitrary accumulators and flexible XOR policy 29 * If your algorithm starts with ~0, then XOR with ~0 before you set 30 * the seed. 31 */ 32 static int crc32c_sparc64_setkey(struct crypto_shash *hash, const u8 *key, 33 unsigned int keylen) 34 { 35 u32 *mctx = crypto_shash_ctx(hash); 36 37 if (keylen != sizeof(u32)) 38 return -EINVAL; 39 *mctx = get_unaligned_le32(key); 40 return 0; 41 } 42 43 static int crc32c_sparc64_init(struct shash_desc *desc) 44 { 45 u32 *mctx = crypto_shash_ctx(desc->tfm); 46 u32 *crcp = shash_desc_ctx(desc); 47 48 *crcp = *mctx; 49 50 return 0; 51 } 52 53 extern void crc32c_sparc64(u32 *crcp, const u64 *data, unsigned int len); 54 55 static u32 crc32c_compute(u32 crc, const u8 *data, unsigned int len) 56 { 57 unsigned int n = -(uintptr_t)data & 7; 58 59 if (n) { 60 /* Data isn't 8-byte aligned. Align it. */ 61 n = min(n, len); 62 crc = __crc32c_le(crc, data, n); 63 data += n; 64 len -= n; 65 } 66 n = len & ~7U; 67 if (n) { 68 crc32c_sparc64(&crc, (const u64 *)data, n); 69 data += n; 70 len -= n; 71 } 72 if (len) 73 crc = __crc32c_le(crc, data, len); 74 return crc; 75 } 76 77 static int crc32c_sparc64_update(struct shash_desc *desc, const u8 *data, 78 unsigned int len) 79 { 80 u32 *crcp = shash_desc_ctx(desc); 81 82 *crcp = crc32c_compute(*crcp, data, len); 83 return 0; 84 } 85 86 static int __crc32c_sparc64_finup(const u32 *crcp, const u8 *data, 87 unsigned int len, u8 *out) 88 { 89 put_unaligned_le32(~crc32c_compute(*crcp, data, len), out); 90 return 0; 91 } 92 93 static int crc32c_sparc64_finup(struct shash_desc *desc, const u8 *data, 94 unsigned int len, u8 *out) 95 { 96 return __crc32c_sparc64_finup(shash_desc_ctx(desc), data, len, out); 97 } 98 99 static int crc32c_sparc64_final(struct shash_desc *desc, u8 *out) 100 { 101 u32 *crcp = shash_desc_ctx(desc); 102 103 put_unaligned_le32(~*crcp, out); 104 return 0; 105 } 106 107 static int crc32c_sparc64_digest(struct shash_desc *desc, const u8 *data, 108 unsigned int len, u8 *out) 109 { 110 return __crc32c_sparc64_finup(crypto_shash_ctx(desc->tfm), data, len, 111 out); 112 } 113 114 static int crc32c_sparc64_cra_init(struct crypto_tfm *tfm) 115 { 116 u32 *key = crypto_tfm_ctx(tfm); 117 118 *key = ~0; 119 120 return 0; 121 } 122 123 #define CHKSUM_BLOCK_SIZE 1 124 #define CHKSUM_DIGEST_SIZE 4 125 126 static struct shash_alg alg = { 127 .setkey = crc32c_sparc64_setkey, 128 .init = crc32c_sparc64_init, 129 .update = crc32c_sparc64_update, 130 .final = crc32c_sparc64_final, 131 .finup = crc32c_sparc64_finup, 132 .digest = crc32c_sparc64_digest, 133 .descsize = sizeof(u32), 134 .digestsize = CHKSUM_DIGEST_SIZE, 135 .base = { 136 .cra_name = "crc32c", 137 .cra_driver_name = "crc32c-sparc64", 138 .cra_priority = SPARC_CR_OPCODE_PRIORITY, 139 .cra_flags = CRYPTO_ALG_OPTIONAL_KEY, 140 .cra_blocksize = CHKSUM_BLOCK_SIZE, 141 .cra_ctxsize = sizeof(u32), 142 .cra_module = THIS_MODULE, 143 .cra_init = crc32c_sparc64_cra_init, 144 } 145 }; 146 147 static bool __init sparc64_has_crc32c_opcode(void) 148 { 149 unsigned long cfr; 150 151 if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO)) 152 return false; 153 154 __asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr)); 155 if (!(cfr & CFR_CRC32C)) 156 return false; 157 158 return true; 159 } 160 161 static int __init crc32c_sparc64_mod_init(void) 162 { 163 if (sparc64_has_crc32c_opcode()) { 164 pr_info("Using sparc64 crc32c opcode optimized CRC32C implementation\n"); 165 return crypto_register_shash(&alg); 166 } 167 pr_info("sparc64 crc32c opcode not available.\n"); 168 return -ENODEV; 169 } 170 171 static void __exit crc32c_sparc64_mod_fini(void) 172 { 173 crypto_unregister_shash(&alg); 174 } 175 176 module_init(crc32c_sparc64_mod_init); 177 module_exit(crc32c_sparc64_mod_fini); 178 179 MODULE_LICENSE("GPL"); 180 MODULE_DESCRIPTION("CRC32c (Castagnoli), sparc64 crc32c opcode accelerated"); 181 182 MODULE_ALIAS_CRYPTO("crc32c"); 183 184 #include "crop_devid.c" 185