1
2
3
4
5
6
7
8
9
10#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
11
12#include <linux/init.h>
13#include <linux/module.h>
14#include <linux/string.h>
15#include <linux/kernel.h>
16#include <linux/crc32.h>
17
18#include <crypto/internal/hash.h>
19
20#include <asm/pstate.h>
21#include <asm/elf.h>
22
23#include "opcodes.h"
24
25
26
27
28
29
30static int crc32c_sparc64_setkey(struct crypto_shash *hash, const u8 *key,
31 unsigned int keylen)
32{
33 u32 *mctx = crypto_shash_ctx(hash);
34
35 if (keylen != sizeof(u32)) {
36 crypto_shash_set_flags(hash, CRYPTO_TFM_RES_BAD_KEY_LEN);
37 return -EINVAL;
38 }
39 *(__le32 *)mctx = le32_to_cpup((__le32 *)key);
40 return 0;
41}
42
43static 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
53extern void crc32c_sparc64(u32 *crcp, const u64 *data, unsigned int len);
54
55static void crc32c_compute(u32 *crcp, const u64 *data, unsigned int len)
56{
57 unsigned int asm_len;
58
59 asm_len = len & ~7U;
60 if (asm_len) {
61 crc32c_sparc64(crcp, data, asm_len);
62 data += asm_len / 8;
63 len -= asm_len;
64 }
65 if (len)
66 *crcp = __crc32c_le(*crcp, (const unsigned char *) data, len);
67}
68
69static int crc32c_sparc64_update(struct shash_desc *desc, const u8 *data,
70 unsigned int len)
71{
72 u32 *crcp = shash_desc_ctx(desc);
73
74 crc32c_compute(crcp, (const u64 *) data, len);
75
76 return 0;
77}
78
79static int __crc32c_sparc64_finup(u32 *crcp, const u8 *data, unsigned int len,
80 u8 *out)
81{
82 u32 tmp = *crcp;
83
84 crc32c_compute(&tmp, (const u64 *) data, len);
85
86 *(__le32 *) out = ~cpu_to_le32(tmp);
87 return 0;
88}
89
90static int crc32c_sparc64_finup(struct shash_desc *desc, const u8 *data,
91 unsigned int len, u8 *out)
92{
93 return __crc32c_sparc64_finup(shash_desc_ctx(desc), data, len, out);
94}
95
96static int crc32c_sparc64_final(struct shash_desc *desc, u8 *out)
97{
98 u32 *crcp = shash_desc_ctx(desc);
99
100 *(__le32 *) out = ~cpu_to_le32p(crcp);
101 return 0;
102}
103
104static int crc32c_sparc64_digest(struct shash_desc *desc, const u8 *data,
105 unsigned int len, u8 *out)
106{
107 return __crc32c_sparc64_finup(crypto_shash_ctx(desc->tfm), data, len,
108 out);
109}
110
111static int crc32c_sparc64_cra_init(struct crypto_tfm *tfm)
112{
113 u32 *key = crypto_tfm_ctx(tfm);
114
115 *key = ~0;
116
117 return 0;
118}
119
120#define CHKSUM_BLOCK_SIZE 1
121#define CHKSUM_DIGEST_SIZE 4
122
123static struct shash_alg alg = {
124 .setkey = crc32c_sparc64_setkey,
125 .init = crc32c_sparc64_init,
126 .update = crc32c_sparc64_update,
127 .final = crc32c_sparc64_final,
128 .finup = crc32c_sparc64_finup,
129 .digest = crc32c_sparc64_digest,
130 .descsize = sizeof(u32),
131 .digestsize = CHKSUM_DIGEST_SIZE,
132 .base = {
133 .cra_name = "crc32c",
134 .cra_driver_name = "crc32c-sparc64",
135 .cra_priority = SPARC_CR_OPCODE_PRIORITY,
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
144static 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
158static 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
168static void __exit crc32c_sparc64_mod_fini(void)
169{
170 crypto_unregister_shash(&alg);
171}
172
173module_init(crc32c_sparc64_mod_init);
174module_exit(crc32c_sparc64_mod_fini);
175
176MODULE_LICENSE("GPL");
177MODULE_DESCRIPTION("CRC32c (Castagnoli), sparc64 crc32c opcode accelerated");
178
179MODULE_ALIAS_CRYPTO("crc32c");
180
181#include "crop_devid.c"
182
