summaryrefslogtreecommitdiff
path: root/arch/s390/crypto/crypt_z990.h
blob: 4df660b99e5acd32f6a9c8c582f95ad0baff06d6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
/*
 * Cryptographic API.
 *
 * Support for z990 cryptographic instructions.
 *
 *   Copyright (C) 2003 IBM Deutschland GmbH, IBM Corporation
 *   Author(s): Thomas Spatzier (tspat@de.ibm.com)
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 *
 */
#ifndef _CRYPTO_ARCH_S390_CRYPT_Z990_H
#define _CRYPTO_ARCH_S390_CRYPT_Z990_H

#include <asm/errno.h>

#define CRYPT_Z990_OP_MASK 0xFF00
#define CRYPT_Z990_FUNC_MASK 0x00FF


/*z990 cryptographic operations*/
enum crypt_z990_operations {
	CRYPT_Z990_KM   = 0x0100,
	CRYPT_Z990_KMC  = 0x0200,
	CRYPT_Z990_KIMD = 0x0300,
	CRYPT_Z990_KLMD = 0x0400,
	CRYPT_Z990_KMAC = 0x0500
};

/*function codes for KM (CIPHER MESSAGE) instruction*/
enum crypt_z990_km_func {
	KM_QUERY            = CRYPT_Z990_KM | 0,
	KM_DEA_ENCRYPT      = CRYPT_Z990_KM | 1,
	KM_DEA_DECRYPT      = CRYPT_Z990_KM | 1 | 0x80, //modifier bit->decipher
	KM_TDEA_128_ENCRYPT = CRYPT_Z990_KM | 2,
	KM_TDEA_128_DECRYPT = CRYPT_Z990_KM | 2 | 0x80,
	KM_TDEA_192_ENCRYPT = CRYPT_Z990_KM | 3,
	KM_TDEA_192_DECRYPT = CRYPT_Z990_KM | 3 | 0x80,
};

/*function codes for KMC (CIPHER MESSAGE WITH CHAINING) instruction*/
enum crypt_z990_kmc_func {
	KMC_QUERY            = CRYPT_Z990_KMC | 0,
	KMC_DEA_ENCRYPT      = CRYPT_Z990_KMC | 1,
	KMC_DEA_DECRYPT      = CRYPT_Z990_KMC | 1 | 0x80, //modifier bit->decipher
	KMC_TDEA_128_ENCRYPT = CRYPT_Z990_KMC | 2,
	KMC_TDEA_128_DECRYPT = CRYPT_Z990_KMC | 2 | 0x80,
	KMC_TDEA_192_ENCRYPT = CRYPT_Z990_KMC | 3,
	KMC_TDEA_192_DECRYPT = CRYPT_Z990_KMC | 3 | 0x80,
};

/*function codes for KIMD (COMPUTE INTERMEDIATE MESSAGE DIGEST) instruction*/
enum crypt_z990_kimd_func {
	KIMD_QUERY   = CRYPT_Z990_KIMD | 0,
	KIMD_SHA_1   = CRYPT_Z990_KIMD | 1,
};

/*function codes for KLMD (COMPUTE LAST MESSAGE DIGEST) instruction*/
enum crypt_z990_klmd_func {
	KLMD_QUERY   = CRYPT_Z990_KLMD | 0,
	KLMD_SHA_1   = CRYPT_Z990_KLMD | 1,
};

/*function codes for KMAC (COMPUTE MESSAGE AUTHENTICATION CODE) instruction*/
enum crypt_z990_kmac_func {
	KMAC_QUERY    = CRYPT_Z990_KMAC | 0,
	KMAC_DEA      = CRYPT_Z990_KMAC | 1,
	KMAC_TDEA_128 = CRYPT_Z990_KMAC | 2,
	KMAC_TDEA_192 = CRYPT_Z990_KMAC | 3
};

/*status word for z990 crypto instructions' QUERY functions*/
struct crypt_z990_query_status {
	u64 high;
	u64 low;
};

/*
 * Standard fixup and ex_table sections for crypt_z990 inline functions.
 * label 0: the z990 crypto operation
 * label 1: just after 1 to catch illegal operation exception on non-z990
 * label 6: the return point after fixup
 * label 7: set error value if exception _in_ crypto operation
 * label 8: set error value if illegal operation exception
 * [ret] is the variable to receive the error code
 * [ERR] is the error code value
 */
#ifndef __s390x__
#define __crypt_z990_fixup \
	".section .fixup,\"ax\" \n"	\
	"7:	lhi	%0,%h[e1] \n"	\
	"	bras	1,9f \n"	\
	"	.long	6b \n"		\
	"8:	lhi	%0,%h[e2] \n"	\
	"	bras	1,9f \n"	\
	"	.long	6b \n"		\
	"9:	l	1,0(1) \n"	\
	"	br	1 \n"		\
	".previous \n"			\
	".section __ex_table,\"a\" \n"	\
	"	.align	4 \n"		\
	"	.long	0b,7b \n"	\
	"	.long	1b,8b \n"	\
	".previous"
#else /* __s390x__ */
#define __crypt_z990_fixup \
	".section .fixup,\"ax\" \n"	\
	"7:	lhi	%0,%h[e1] \n"	\
	"	jg	6b \n"		\
	"8:	lhi	%0,%h[e2] \n"	\
	"	jg	6b \n"		\
	".previous\n"			\
	".section __ex_table,\"a\" \n"	\
	"	.align	8 \n"		\
	"	.quad	0b,7b \n"	\
	"	.quad	1b,8b \n"	\
	".previous"
#endif /* __s390x__ */

/*
 * Standard code for setting the result of z990 crypto instructions.
 * %0: the register which will receive the result
 * [result]: the register containing the result (e.g. second operand length
 * to compute number of processed bytes].
 */
#ifndef __s390x__
#define __crypt_z990_set_result \
	"	lr	%0,%[result] \n"
#else /* __s390x__ */
#define __crypt_z990_set_result \
	"	lgr	%0,%[result] \n"
#endif

/*
 * Executes the KM (CIPHER MESSAGE) operation of the z990 CPU.
 * @param func: the function code passed to KM; see crypt_z990_km_func
 * @param param: address of parameter block; see POP for details on each func
 * @param dest: address of destination memory area
 * @param src: address of source memory area
 * @param src_len: length of src operand in bytes
 * @returns < zero for failure, 0 for the query func, number of processed bytes
 * 	for encryption/decryption funcs
 */
static inline int
crypt_z990_km(long func, void* param, u8* dest, const u8* src, long src_len)
{
	register long __func asm("0") = func & CRYPT_Z990_FUNC_MASK;
	register void* __param asm("1") = param;
	register u8* __dest asm("4") = dest;
	register const u8* __src asm("2") = src;
	register long __src_len asm("3") = src_len;
	int ret;

	ret = 0;
	__asm__ __volatile__ (
		"0:	.insn	rre,0xB92E0000,%1,%2 \n" //KM opcode
		"1:	brc	1,0b \n" //handle partial completion
		__crypt_z990_set_result
		"6:	\n"
		__crypt_z990_fixup
		: "+d" (ret), "+a" (__dest), "+a" (__src),
		  [result] "+d" (__src_len)
		: [e1] "K" (-EFAULT), [e2] "K" (-ENOSYS), "d" (__func),
		  "a" (__param)
		: "cc", "memory"
	);
	if (ret >= 0 && func & CRYPT_Z990_FUNC_MASK){
		ret = src_len - ret;
	}
	return ret;
}

/*
 * Executes the KMC (CIPHER MESSAGE WITH CHAINING) operation of the z990 CPU.
 * @param func: the function code passed to KM; see crypt_z990_kmc_func
 * @param param: address of parameter block; see POP for details on each func
 * @param dest: address of destination memory area
 * @param src: address of source memory area
 * @param src_len: length of src operand in bytes
 * @returns < zero for failure, 0 for the query func, number of processed bytes
 * 	for encryption/decryption funcs
 */
static inline int
crypt_z990_kmc(long func, void* param, u8* dest, const u8* src, long src_len)
{
	register long __func asm("0") = func & CRYPT_Z990_FUNC_MASK;
	register void* __param asm("1") = param;
	register u8* __dest asm("4") = dest;
	register const u8* __src asm("2") = src;
	register long __src_len asm("3") = src_len;
	int ret;

	ret = 0;
	__asm__ __volatile__ (
		"0:	.insn	rre,0xB92F0000,%1,%2 \n" //KMC opcode
		"1:	brc	1,0b \n" //handle partial completion
		__crypt_z990_set_result
		"6:	\n"
		__crypt_z990_fixup
		: "+d" (ret), "+a" (__dest), "+a" (__src),
		  [result] "+d" (__src_len)
		: [e1] "K" (-EFAULT), [e2] "K" (-ENOSYS), "d" (__func),
		  "a" (__param)
		: "cc", "memory"
	);
	if (ret >= 0 && func & CRYPT_Z990_FUNC_MASK){
		ret = src_len - ret;
	}
	return ret;
}

/*
 * Executes the KIMD (COMPUTE INTERMEDIATE MESSAGE DIGEST) operation
 * of the z990 CPU.
 * @param func: the function code passed to KM; see crypt_z990_kimd_func
 * @param param: address of parameter block; see POP for details on each func
 * @param src: address of source memory area
 * @param src_len: length of src operand in bytes
 * @returns < zero for failure, 0 for the query func, number of processed bytes
 * 	for digest funcs
 */
static inline int
crypt_z990_kimd(long func, void* param, const u8* src, long src_len)
{
	register long __func asm("0") = func & CRYPT_Z990_FUNC_MASK;
	register void* __param asm("1") = param;
	register const u8* __src asm("2") = src;
	register long __src_len asm("3") = src_len;
	int ret;

	ret = 0;
	__asm__ __volatile__ (
		"0:	.insn	rre,0xB93E0000,%1,%1 \n" //KIMD opcode
		"1:	brc	1,0b \n" /*handle partical completion of kimd*/
		__crypt_z990_set_result
		"6:	\n"
		__crypt_z990_fixup
		: "+d" (ret), "+a" (__src), [result] "+d" (__src_len)
		: [e1] "K" (-EFAULT), [e2] "K" (-ENOSYS), "d" (__func),
		  "a" (__param)
		: "cc", "memory"
	);
	if (ret >= 0 && (func & CRYPT_Z990_FUNC_MASK)){
		ret = src_len - ret;
	}
	return ret;
}

/*
 * Executes the KLMD (COMPUTE LAST MESSAGE DIGEST) operation of the z990 CPU.
 * @param func: the function code passed to KM; see crypt_z990_klmd_func
 * @param param: address of parameter block; see POP for details on each func
 * @param src: address of source memory area
 * @param src_len: length of src operand in bytes
 * @returns < zero for failure, 0 for the query func, number of processed bytes
 * 	for digest funcs
 */
static inline int
crypt_z990_klmd(long func, void* param, const u8* src, long src_len)
{
	register long __func asm("0") = func & CRYPT_Z990_FUNC_MASK;
	register void* __param asm("1") = param;
	register const u8* __src asm("2") = src;
	register long __src_len asm("3") = src_len;
	int ret;

	ret = 0;
	__asm__ __volatile__ (
		"0:	.insn	rre,0xB93F0000,%1,%1 \n" //KLMD opcode
		"1:	brc	1,0b \n" /*handle partical completion of klmd*/
		__crypt_z990_set_result
		"6:	\n"
		__crypt_z990_fixup
		: "+d" (ret), "+a" (__src), [result] "+d" (__src_len)
		: [e1] "K" (-EFAULT), [e2] "K" (-ENOSYS), "d" (__func),
		  "a" (__param)
		: "cc", "memory"
	);
	if (ret >= 0 && func & CRYPT_Z990_FUNC_MASK){
		ret = src_len - ret;
	}
	return ret;
}

/*
 * Executes the KMAC (COMPUTE MESSAGE AUTHENTICATION CODE) operation
 * of the z990 CPU.
 * @param func: the function code passed to KM; see crypt_z990_klmd_func
 * @param param: address of parameter block; see POP for details on each func
 * @param src: address of source memory area
 * @param src_len: length of src operand in bytes
 * @returns < zero for failure, 0 for the query func, number of processed bytes
 * 	for digest funcs
 */
static inline int
crypt_z990_kmac(long func, void* param, const u8* src, long src_len)
{
	register long __func asm("0") = func & CRYPT_Z990_FUNC_MASK;
	register void* __param asm("1") = param;
	register const u8* __src asm("2") = src;
	register long __src_len asm("3") = src_len;
	int ret;

	ret = 0;
	__asm__ __volatile__ (
		"0:	.insn	rre,0xB91E0000,%5,%5 \n" //KMAC opcode
		"1:	brc	1,0b \n" /*handle partical completion of klmd*/
		__crypt_z990_set_result
		"6:	\n"
		__crypt_z990_fixup
		: "+d" (ret), "+a" (__src), [result] "+d" (__src_len)
		: [e1] "K" (-EFAULT), [e2] "K" (-ENOSYS), "d" (__func),
		  "a" (__param)
		: "cc", "memory"
	);
	if (ret >= 0 && func & CRYPT_Z990_FUNC_MASK){
		ret = src_len - ret;
	}
	return ret;
}

/**
 * Tests if a specific z990 crypto function is implemented on the machine.
 * @param func:	the function code of the specific function; 0 if op in general
 * @return	1 if func available; 0 if func or op in general not available
 */
static inline int
crypt_z990_func_available(int func)
{
	int ret;

	struct crypt_z990_query_status status = {
		.high = 0,
		.low = 0
	};
	switch (func & CRYPT_Z990_OP_MASK){
		case CRYPT_Z990_KM:
			ret = crypt_z990_km(KM_QUERY, &status, NULL, NULL, 0);
			break;
		case CRYPT_Z990_KMC:
			ret = crypt_z990_kmc(KMC_QUERY, &status, NULL, NULL, 0);
			break;
		case CRYPT_Z990_KIMD:
			ret = crypt_z990_kimd(KIMD_QUERY, &status, NULL, 0);
			break;
		case CRYPT_Z990_KLMD:
			ret = crypt_z990_klmd(KLMD_QUERY, &status, NULL, 0);
			break;
		case CRYPT_Z990_KMAC:
			ret = crypt_z990_kmac(KMAC_QUERY, &status, NULL, 0);
			break;
		default:
			ret = 0;
			return ret;
	}
	if (ret >= 0){
		func &= CRYPT_Z990_FUNC_MASK;
		func &= 0x7f; //mask modifier bit
		if (func < 64){
			ret = (status.high >> (64 - func - 1)) & 0x1;
		} else {
			ret = (status.low >> (128 - func - 1)) & 0x1;
		}
	} else {
		ret = 0;
	}
	return ret;
}


#endif // _CRYPTO_ARCH_S390_CRYPT_Z990_H