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1/*
2 * Cryptographic API.
3 *
4 * Support for z990 cryptographic instructions.
5 *
6 * Copyright (C) 2003 IBM Deutschland GmbH, IBM Corporation
7 * Author(s): Thomas Spatzier (tspat@de.ibm.com)
8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the Free
11 * Software Foundation; either version 2 of the License, or (at your option)
12 * any later version.
13 *
14 */
15#ifndef _CRYPTO_ARCH_S390_CRYPT_Z990_H
16#define _CRYPTO_ARCH_S390_CRYPT_Z990_H
17
18#include <asm/errno.h>
19
20#define CRYPT_Z990_OP_MASK 0xFF00
21#define CRYPT_Z990_FUNC_MASK 0x00FF
22
23
24/*z990 cryptographic operations*/
25enum crypt_z990_operations {
26 CRYPT_Z990_KM = 0x0100,
27 CRYPT_Z990_KMC = 0x0200,
28 CRYPT_Z990_KIMD = 0x0300,
29 CRYPT_Z990_KLMD = 0x0400,
30 CRYPT_Z990_KMAC = 0x0500
31};
32
33/*function codes for KM (CIPHER MESSAGE) instruction*/
34enum crypt_z990_km_func {
35 KM_QUERY = CRYPT_Z990_KM | 0,
36 KM_DEA_ENCRYPT = CRYPT_Z990_KM | 1,
37 KM_DEA_DECRYPT = CRYPT_Z990_KM | 1 | 0x80, //modifier bit->decipher
38 KM_TDEA_128_ENCRYPT = CRYPT_Z990_KM | 2,
39 KM_TDEA_128_DECRYPT = CRYPT_Z990_KM | 2 | 0x80,
40 KM_TDEA_192_ENCRYPT = CRYPT_Z990_KM | 3,
41 KM_TDEA_192_DECRYPT = CRYPT_Z990_KM | 3 | 0x80,
42};
43
44/*function codes for KMC (CIPHER MESSAGE WITH CHAINING) instruction*/
45enum crypt_z990_kmc_func {
46 KMC_QUERY = CRYPT_Z990_KMC | 0,
47 KMC_DEA_ENCRYPT = CRYPT_Z990_KMC | 1,
48 KMC_DEA_DECRYPT = CRYPT_Z990_KMC | 1 | 0x80, //modifier bit->decipher
49 KMC_TDEA_128_ENCRYPT = CRYPT_Z990_KMC | 2,
50 KMC_TDEA_128_DECRYPT = CRYPT_Z990_KMC | 2 | 0x80,
51 KMC_TDEA_192_ENCRYPT = CRYPT_Z990_KMC | 3,
52 KMC_TDEA_192_DECRYPT = CRYPT_Z990_KMC | 3 | 0x80,
53};
54
55/*function codes for KIMD (COMPUTE INTERMEDIATE MESSAGE DIGEST) instruction*/
56enum crypt_z990_kimd_func {
57 KIMD_QUERY = CRYPT_Z990_KIMD | 0,
58 KIMD_SHA_1 = CRYPT_Z990_KIMD | 1,
59};
60
61/*function codes for KLMD (COMPUTE LAST MESSAGE DIGEST) instruction*/
62enum crypt_z990_klmd_func {
63 KLMD_QUERY = CRYPT_Z990_KLMD | 0,
64 KLMD_SHA_1 = CRYPT_Z990_KLMD | 1,
65};
66
67/*function codes for KMAC (COMPUTE MESSAGE AUTHENTICATION CODE) instruction*/
68enum crypt_z990_kmac_func {
69 KMAC_QUERY = CRYPT_Z990_KMAC | 0,
70 KMAC_DEA = CRYPT_Z990_KMAC | 1,
71 KMAC_TDEA_128 = CRYPT_Z990_KMAC | 2,
72 KMAC_TDEA_192 = CRYPT_Z990_KMAC | 3
73};
74
75/*status word for z990 crypto instructions' QUERY functions*/
76struct crypt_z990_query_status {
77 u64 high;
78 u64 low;
79};
80
81/*
82 * Standard fixup and ex_table sections for crypt_z990 inline functions.
83 * label 0: the z990 crypto operation
84 * label 1: just after 1 to catch illegal operation exception on non-z990
85 * label 6: the return point after fixup
86 * label 7: set error value if exception _in_ crypto operation
87 * label 8: set error value if illegal operation exception
88 * [ret] is the variable to receive the error code
89 * [ERR] is the error code value
90 */
91#ifndef __s390x__
92#define __crypt_z990_fixup \
93 ".section .fixup,\"ax\" \n" \
94 "7: lhi %0,%h[e1] \n" \
95 " bras 1,9f \n" \
96 " .long 6b \n" \
97 "8: lhi %0,%h[e2] \n" \
98 " bras 1,9f \n" \
99 " .long 6b \n" \
100 "9: l 1,0(1) \n" \
101 " br 1 \n" \
102 ".previous \n" \
103 ".section __ex_table,\"a\" \n" \
104 " .align 4 \n" \
105 " .long 0b,7b \n" \
106 " .long 1b,8b \n" \
107 ".previous"
108#else /* __s390x__ */
109#define __crypt_z990_fixup \
110 ".section .fixup,\"ax\" \n" \
111 "7: lhi %0,%h[e1] \n" \
112 " jg 6b \n" \
113 "8: lhi %0,%h[e2] \n" \
114 " jg 6b \n" \
115 ".previous\n" \
116 ".section __ex_table,\"a\" \n" \
117 " .align 8 \n" \
118 " .quad 0b,7b \n" \
119 " .quad 1b,8b \n" \
120 ".previous"
121#endif /* __s390x__ */
122
123/*
124 * Standard code for setting the result of z990 crypto instructions.
125 * %0: the register which will receive the result
126 * [result]: the register containing the result (e.g. second operand length
127 * to compute number of processed bytes].
128 */
129#ifndef __s390x__
130#define __crypt_z990_set_result \
131 " lr %0,%[result] \n"
132#else /* __s390x__ */
133#define __crypt_z990_set_result \
134 " lgr %0,%[result] \n"
135#endif
136
137/*
138 * Executes the KM (CIPHER MESSAGE) operation of the z990 CPU.
139 * @param func: the function code passed to KM; see crypt_z990_km_func
140 * @param param: address of parameter block; see POP for details on each func
141 * @param dest: address of destination memory area
142 * @param src: address of source memory area
143 * @param src_len: length of src operand in bytes
144 * @returns < zero for failure, 0 for the query func, number of processed bytes
145 * for encryption/decryption funcs
146 */
147static inline int
148crypt_z990_km(long func, void* param, u8* dest, const u8* src, long src_len)
149{
150 register long __func asm("0") = func & CRYPT_Z990_FUNC_MASK;
151 register void* __param asm("1") = param;
152 register u8* __dest asm("4") = dest;
153 register const u8* __src asm("2") = src;
154 register long __src_len asm("3") = src_len;
155 int ret;
156
157 ret = 0;
158 __asm__ __volatile__ (
159 "0: .insn rre,0xB92E0000,%1,%2 \n" //KM opcode
160 "1: brc 1,0b \n" //handle partial completion
161 __crypt_z990_set_result
162 "6: \n"
163 __crypt_z990_fixup
164 : "+d" (ret), "+a" (__dest), "+a" (__src),
165 [result] "+d" (__src_len)
166 : [e1] "K" (-EFAULT), [e2] "K" (-ENOSYS), "d" (__func),
167 "a" (__param)
168 : "cc", "memory"
169 );
170 if (ret >= 0 && func & CRYPT_Z990_FUNC_MASK){
171 ret = src_len - ret;
172 }
173 return ret;
174}
175
176/*
177 * Executes the KMC (CIPHER MESSAGE WITH CHAINING) operation of the z990 CPU.
178 * @param func: the function code passed to KM; see crypt_z990_kmc_func
179 * @param param: address of parameter block; see POP for details on each func
180 * @param dest: address of destination memory area
181 * @param src: address of source memory area
182 * @param src_len: length of src operand in bytes
183 * @returns < zero for failure, 0 for the query func, number of processed bytes
184 * for encryption/decryption funcs
185 */
186static inline int
187crypt_z990_kmc(long func, void* param, u8* dest, const u8* src, long src_len)
188{
189 register long __func asm("0") = func & CRYPT_Z990_FUNC_MASK;
190 register void* __param asm("1") = param;
191 register u8* __dest asm("4") = dest;
192 register const u8* __src asm("2") = src;
193 register long __src_len asm("3") = src_len;
194 int ret;
195
196 ret = 0;
197 __asm__ __volatile__ (
198 "0: .insn rre,0xB92F0000,%1,%2 \n" //KMC opcode
199 "1: brc 1,0b \n" //handle partial completion
200 __crypt_z990_set_result
201 "6: \n"
202 __crypt_z990_fixup
203 : "+d" (ret), "+a" (__dest), "+a" (__src),
204 [result] "+d" (__src_len)
205 : [e1] "K" (-EFAULT), [e2] "K" (-ENOSYS), "d" (__func),
206 "a" (__param)
207 : "cc", "memory"
208 );
209 if (ret >= 0 && func & CRYPT_Z990_FUNC_MASK){
210 ret = src_len - ret;
211 }
212 return ret;
213}
214
215/*
216 * Executes the KIMD (COMPUTE INTERMEDIATE MESSAGE DIGEST) operation
217 * of the z990 CPU.
218 * @param func: the function code passed to KM; see crypt_z990_kimd_func
219 * @param param: address of parameter block; see POP for details on each func
220 * @param src: address of source memory area
221 * @param src_len: length of src operand in bytes
222 * @returns < zero for failure, 0 for the query func, number of processed bytes
223 * for digest funcs
224 */
225static inline int
226crypt_z990_kimd(long func, void* param, const u8* src, long src_len)
227{
228 register long __func asm("0") = func & CRYPT_Z990_FUNC_MASK;
229 register void* __param asm("1") = param;
230 register const u8* __src asm("2") = src;
231 register long __src_len asm("3") = src_len;
232 int ret;
233
234 ret = 0;
235 __asm__ __volatile__ (
236 "0: .insn rre,0xB93E0000,%1,%1 \n" //KIMD opcode
237 "1: brc 1,0b \n" /*handle partical completion of kimd*/
238 __crypt_z990_set_result
239 "6: \n"
240 __crypt_z990_fixup
241 : "+d" (ret), "+a" (__src), [result] "+d" (__src_len)
242 : [e1] "K" (-EFAULT), [e2] "K" (-ENOSYS), "d" (__func),
243 "a" (__param)
244 : "cc", "memory"
245 );
246 if (ret >= 0 && (func & CRYPT_Z990_FUNC_MASK)){
247 ret = src_len - ret;
248 }
249 return ret;
250}
251
252/*
253 * Executes the KLMD (COMPUTE LAST MESSAGE DIGEST) operation of the z990 CPU.
254 * @param func: the function code passed to KM; see crypt_z990_klmd_func
255 * @param param: address of parameter block; see POP for details on each func
256 * @param src: address of source memory area
257 * @param src_len: length of src operand in bytes
258 * @returns < zero for failure, 0 for the query func, number of processed bytes
259 * for digest funcs
260 */
261static inline int
262crypt_z990_klmd(long func, void* param, const u8* src, long src_len)
263{
264 register long __func asm("0") = func & CRYPT_Z990_FUNC_MASK;
265 register void* __param asm("1") = param;
266 register const u8* __src asm("2") = src;
267 register long __src_len asm("3") = src_len;
268 int ret;
269
270 ret = 0;
271 __asm__ __volatile__ (
272 "0: .insn rre,0xB93F0000,%1,%1 \n" //KLMD opcode
273 "1: brc 1,0b \n" /*handle partical completion of klmd*/
274 __crypt_z990_set_result
275 "6: \n"
276 __crypt_z990_fixup
277 : "+d" (ret), "+a" (__src), [result] "+d" (__src_len)
278 : [e1] "K" (-EFAULT), [e2] "K" (-ENOSYS), "d" (__func),
279 "a" (__param)
280 : "cc", "memory"
281 );
282 if (ret >= 0 && func & CRYPT_Z990_FUNC_MASK){
283 ret = src_len - ret;
284 }
285 return ret;
286}
287
288/*
289 * Executes the KMAC (COMPUTE MESSAGE AUTHENTICATION CODE) operation
290 * of the z990 CPU.
291 * @param func: the function code passed to KM; see crypt_z990_klmd_func
292 * @param param: address of parameter block; see POP for details on each func
293 * @param src: address of source memory area
294 * @param src_len: length of src operand in bytes
295 * @returns < zero for failure, 0 for the query func, number of processed bytes
296 * for digest funcs
297 */
298static inline int
299crypt_z990_kmac(long func, void* param, const u8* src, long src_len)
300{
301 register long __func asm("0") = func & CRYPT_Z990_FUNC_MASK;
302 register void* __param asm("1") = param;
303 register const u8* __src asm("2") = src;
304 register long __src_len asm("3") = src_len;
305 int ret;
306
307 ret = 0;
308 __asm__ __volatile__ (
309 "0: .insn rre,0xB91E0000,%5,%5 \n" //KMAC opcode
310 "1: brc 1,0b \n" /*handle partical completion of klmd*/
311 __crypt_z990_set_result
312 "6: \n"
313 __crypt_z990_fixup
314 : "+d" (ret), "+a" (__src), [result] "+d" (__src_len)
315 : [e1] "K" (-EFAULT), [e2] "K" (-ENOSYS), "d" (__func),
316 "a" (__param)
317 : "cc", "memory"
318 );
319 if (ret >= 0 && func & CRYPT_Z990_FUNC_MASK){
320 ret = src_len - ret;
321 }
322 return ret;
323}
324
325/**
326 * Tests if a specific z990 crypto function is implemented on the machine.
327 * @param func: the function code of the specific function; 0 if op in general
328 * @return 1 if func available; 0 if func or op in general not available
329 */
330static inline int
331crypt_z990_func_available(int func)
332{
333 int ret;
334
335 struct crypt_z990_query_status status = {
336 .high = 0,
337 .low = 0
338 };
339 switch (func & CRYPT_Z990_OP_MASK){
340 case CRYPT_Z990_KM:
341 ret = crypt_z990_km(KM_QUERY, &status, NULL, NULL, 0);
342 break;
343 case CRYPT_Z990_KMC:
344 ret = crypt_z990_kmc(KMC_QUERY, &status, NULL, NULL, 0);
345 break;
346 case CRYPT_Z990_KIMD:
347 ret = crypt_z990_kimd(KIMD_QUERY, &status, NULL, 0);
348 break;
349 case CRYPT_Z990_KLMD:
350 ret = crypt_z990_klmd(KLMD_QUERY, &status, NULL, 0);
351 break;
352 case CRYPT_Z990_KMAC:
353 ret = crypt_z990_kmac(KMAC_QUERY, &status, NULL, 0);
354 break;
355 default:
356 ret = 0;
357 return ret;
358 }
359 if (ret >= 0){
360 func &= CRYPT_Z990_FUNC_MASK;
361 func &= 0x7f; //mask modifier bit
362 if (func < 64){
363 ret = (status.high >> (64 - func - 1)) & 0x1;
364 } else {
365 ret = (status.low >> (128 - func - 1)) & 0x1;
366 }
367 } else {
368 ret = 0;
369 }
370 return ret;
371}
372
373
374#endif // _CRYPTO_ARCH_S390_CRYPT_Z990_H
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