1 // SPDX-License-Identifier: GPL-2.0-or-later <<
2 /* 1 /*
3 * Cryptographic API for the 842 software comp 2 * Cryptographic API for the 842 software compression algorithm.
4 * 3 *
>> 4 * This program is free software; you can redistribute it and/or modify
>> 5 * it under the terms of the GNU General Public License as published by
>> 6 * the Free Software Foundation; either version 2 of the License, or
>> 7 * (at your option) any later version.
>> 8 *
>> 9 * This program is distributed in the hope that it will be useful,
>> 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
>> 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
>> 12 * GNU General Public License for more details.
>> 13 *
5 * Copyright (C) IBM Corporation, 2011-2015 14 * Copyright (C) IBM Corporation, 2011-2015
6 * 15 *
7 * Original Authors: Robert Jennings <rcj@linu 16 * Original Authors: Robert Jennings <rcj@linux.vnet.ibm.com>
8 * Seth Jennings <sjenning@l 17 * Seth Jennings <sjenning@linux.vnet.ibm.com>
9 * 18 *
10 * Rewrite: Dan Streetman <ddstreet@ieee.org> 19 * Rewrite: Dan Streetman <ddstreet@ieee.org>
11 * 20 *
12 * This is the software implementation of comp 21 * This is the software implementation of compression and decompression using
13 * the 842 format. This uses the software 842 22 * the 842 format. This uses the software 842 library at lib/842/ which is
14 * only a reference implementation, and is ver 23 * only a reference implementation, and is very, very slow as compared to other
15 * software compressors. You probably do not 24 * software compressors. You probably do not want to use this software
16 * compression. If you have access to the Pow 25 * compression. If you have access to the PowerPC 842 compression hardware, you
17 * want to use the 842 hardware compression in 26 * want to use the 842 hardware compression interface, which is at:
18 * drivers/crypto/nx/nx-842-crypto.c 27 * drivers/crypto/nx/nx-842-crypto.c
19 */ 28 */
20 29
21 #include <linux/init.h> 30 #include <linux/init.h>
22 #include <linux/module.h> 31 #include <linux/module.h>
23 #include <linux/crypto.h> 32 #include <linux/crypto.h>
24 #include <linux/sw842.h> 33 #include <linux/sw842.h>
25 #include <crypto/internal/scompress.h> <<
26 34
27 struct crypto842_ctx { 35 struct crypto842_ctx {
28 void *wmem; /* working memory for !! 36 char wmem[SW842_MEM_COMPRESS]; /* working memory for compress */
29 }; 37 };
30 38
31 static void *crypto842_alloc_ctx(struct crypto <<
32 { <<
33 void *ctx; <<
34 <<
35 ctx = kmalloc(SW842_MEM_COMPRESS, GFP_ <<
36 if (!ctx) <<
37 return ERR_PTR(-ENOMEM); <<
38 <<
39 return ctx; <<
40 } <<
41 <<
42 static int crypto842_init(struct crypto_tfm *t <<
43 { <<
44 struct crypto842_ctx *ctx = crypto_tfm <<
45 <<
46 ctx->wmem = crypto842_alloc_ctx(NULL); <<
47 if (IS_ERR(ctx->wmem)) <<
48 return -ENOMEM; <<
49 <<
50 return 0; <<
51 } <<
52 <<
53 static void crypto842_free_ctx(struct crypto_s <<
54 { <<
55 kfree(ctx); <<
56 } <<
57 <<
58 static void crypto842_exit(struct crypto_tfm * <<
59 { <<
60 struct crypto842_ctx *ctx = crypto_tfm <<
61 <<
62 crypto842_free_ctx(NULL, ctx->wmem); <<
63 } <<
64 <<
65 static int crypto842_compress(struct crypto_tf 39 static int crypto842_compress(struct crypto_tfm *tfm,
66 const u8 *src, u 40 const u8 *src, unsigned int slen,
67 u8 *dst, unsigne 41 u8 *dst, unsigned int *dlen)
68 { 42 {
69 struct crypto842_ctx *ctx = crypto_tfm 43 struct crypto842_ctx *ctx = crypto_tfm_ctx(tfm);
70 44
71 return sw842_compress(src, slen, dst, 45 return sw842_compress(src, slen, dst, dlen, ctx->wmem);
72 } 46 }
73 47
74 static int crypto842_scompress(struct crypto_s <<
75 const u8 *src, <<
76 u8 *dst, unsign <<
77 { <<
78 return sw842_compress(src, slen, dst, <<
79 } <<
80 <<
81 static int crypto842_decompress(struct crypto_ 48 static int crypto842_decompress(struct crypto_tfm *tfm,
82 const u8 *src, 49 const u8 *src, unsigned int slen,
83 u8 *dst, unsig 50 u8 *dst, unsigned int *dlen)
84 { 51 {
85 return sw842_decompress(src, slen, dst 52 return sw842_decompress(src, slen, dst, dlen);
86 } 53 }
87 54
88 static int crypto842_sdecompress(struct crypto <<
89 const u8 *src <<
90 u8 *dst, unsi <<
91 { <<
92 return sw842_decompress(src, slen, dst <<
93 } <<
94 <<
95 static struct crypto_alg alg = { 55 static struct crypto_alg alg = {
96 .cra_name = "842", 56 .cra_name = "842",
97 .cra_driver_name = "842-generic 57 .cra_driver_name = "842-generic",
98 .cra_priority = 100, 58 .cra_priority = 100,
99 .cra_flags = CRYPTO_ALG_T 59 .cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
100 .cra_ctxsize = sizeof(struc 60 .cra_ctxsize = sizeof(struct crypto842_ctx),
101 .cra_module = THIS_MODULE, 61 .cra_module = THIS_MODULE,
102 .cra_init = crypto842_in <<
103 .cra_exit = crypto842_ex <<
104 .cra_u = { .compress 62 .cra_u = { .compress = {
105 .coa_compress = crypto842_co 63 .coa_compress = crypto842_compress,
106 .coa_decompress = crypto842_de 64 .coa_decompress = crypto842_decompress } }
107 }; 65 };
108 66
109 static struct scomp_alg scomp = { <<
110 .alloc_ctx = crypto842_al <<
111 .free_ctx = crypto842_fr <<
112 .compress = crypto842_sc <<
113 .decompress = crypto842_sd <<
114 .base = { <<
115 .cra_name = "842", <<
116 .cra_driver_name = "842-scomp" <<
117 .cra_priority = 100, <<
118 .cra_module = THIS_MODULE <<
119 } <<
120 }; <<
121 <<
122 static int __init crypto842_mod_init(void) 67 static int __init crypto842_mod_init(void)
123 { 68 {
124 int ret; !! 69 return crypto_register_alg(&alg);
125 <<
126 ret = crypto_register_alg(&alg); <<
127 if (ret) <<
128 return ret; <<
129 <<
130 ret = crypto_register_scomp(&scomp); <<
131 if (ret) { <<
132 crypto_unregister_alg(&alg); <<
133 return ret; <<
134 } <<
135 <<
136 return ret; <<
137 } 70 }
138 subsys_initcall(crypto842_mod_init); !! 71 module_init(crypto842_mod_init);
139 72
140 static void __exit crypto842_mod_exit(void) 73 static void __exit crypto842_mod_exit(void)
141 { 74 {
142 crypto_unregister_alg(&alg); 75 crypto_unregister_alg(&alg);
143 crypto_unregister_scomp(&scomp); <<
144 } 76 }
145 module_exit(crypto842_mod_exit); 77 module_exit(crypto842_mod_exit);
146 78
147 MODULE_LICENSE("GPL"); 79 MODULE_LICENSE("GPL");
148 MODULE_DESCRIPTION("842 Software Compression A 80 MODULE_DESCRIPTION("842 Software Compression Algorithm");
149 MODULE_ALIAS_CRYPTO("842"); 81 MODULE_ALIAS_CRYPTO("842");
150 MODULE_ALIAS_CRYPTO("842-generic"); 82 MODULE_ALIAS_CRYPTO("842-generic");
151 MODULE_AUTHOR("Dan Streetman <ddstreet@ieee.or 83 MODULE_AUTHOR("Dan Streetman <ddstreet@ieee.org>");
152 84
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