This source file includes following definitions.
- crc32c_sparc64_setkey
- crc32c_sparc64_init
- crc32c_compute
- crc32c_sparc64_update
- __crc32c_sparc64_finup
- crc32c_sparc64_finup
- crc32c_sparc64_final
- crc32c_sparc64_digest
- crc32c_sparc64_cra_init
- sparc64_has_crc32c_opcode
- crc32c_sparc64_mod_init
- crc32c_sparc64_mod_fini
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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
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29
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"