summaryrefslogtreecommitdiffstats
path: root/drivers/tee/optee/optee_msg.h
blob: dd7a06ee04629ed5e7daf9f14140ee21cc254670 (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
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
/*
 * Copyright (c) 2015-2016, Linaro Limited
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
#ifndef _OPTEE_MSG_H
#define _OPTEE_MSG_H

#include <linux/bitops.h>
#include <linux/types.h>

/*
 * This file defines the OP-TEE message protocol used to communicate
 * with an instance of OP-TEE running in secure world.
 *
 * This file is divided into three sections.
 * 1. Formatting of messages.
 * 2. Requests from normal world
 * 3. Requests from secure world, Remote Procedure Call (RPC), handled by
 *    tee-supplicant.
 */

/*****************************************************************************
 * Part 1 - formatting of messages
 *****************************************************************************/

#define OPTEE_MSG_ATTR_TYPE_NONE		0x0
#define OPTEE_MSG_ATTR_TYPE_VALUE_INPUT		0x1
#define OPTEE_MSG_ATTR_TYPE_VALUE_OUTPUT	0x2
#define OPTEE_MSG_ATTR_TYPE_VALUE_INOUT		0x3
#define OPTEE_MSG_ATTR_TYPE_RMEM_INPUT		0x5
#define OPTEE_MSG_ATTR_TYPE_RMEM_OUTPUT		0x6
#define OPTEE_MSG_ATTR_TYPE_RMEM_INOUT		0x7
#define OPTEE_MSG_ATTR_TYPE_TMEM_INPUT		0x9
#define OPTEE_MSG_ATTR_TYPE_TMEM_OUTPUT		0xa
#define OPTEE_MSG_ATTR_TYPE_TMEM_INOUT		0xb

#define OPTEE_MSG_ATTR_TYPE_MASK		GENMASK(7, 0)

/*
 * Meta parameter to be absorbed by the Secure OS and not passed
 * to the Trusted Application.
 *
 * Currently only used with OPTEE_MSG_CMD_OPEN_SESSION.
 */
#define OPTEE_MSG_ATTR_META			BIT(8)

/*
 * The temporary shared memory object is not physically contigous and this
 * temp memref is followed by another fragment until the last temp memref
 * that doesn't have this bit set.
 */
#define OPTEE_MSG_ATTR_FRAGMENT			BIT(9)

/*
 * Memory attributes for caching passed with temp memrefs. The actual value
 * used is defined outside the message protocol with the exception of
 * OPTEE_MSG_ATTR_CACHE_PREDEFINED which means the attributes already
 * defined for the memory range should be used. If optee_smc.h is used as
 * bearer of this protocol OPTEE_SMC_SHM_* is used for values.
 */
#define OPTEE_MSG_ATTR_CACHE_SHIFT		16
#define OPTEE_MSG_ATTR_CACHE_MASK		GENMASK(2, 0)
#define OPTEE_MSG_ATTR_CACHE_PREDEFINED		0

/*
 * Same values as TEE_LOGIN_* from TEE Internal API
 */
#define OPTEE_MSG_LOGIN_PUBLIC			0x00000000
#define OPTEE_MSG_LOGIN_USER			0x00000001
#define OPTEE_MSG_LOGIN_GROUP			0x00000002
#define OPTEE_MSG_LOGIN_APPLICATION		0x00000004
#define OPTEE_MSG_LOGIN_APPLICATION_USER	0x00000005
#define OPTEE_MSG_LOGIN_APPLICATION_GROUP	0x00000006

/**
 * struct optee_msg_param_tmem - temporary memory reference parameter
 * @buf_ptr:	Address of the buffer
 * @size:	Size of the buffer
 * @shm_ref:	Temporary shared memory reference, pointer to a struct tee_shm
 *
 * Secure and normal world communicates pointers as physical address
 * instead of the virtual address. This is because secure and normal world
 * have completely independent memory mapping. Normal world can even have a
 * hypervisor which need to translate the guest physical address (AKA IPA
 * in ARM documentation) to a real physical address before passing the
 * structure to secure world.
 */
struct optee_msg_param_tmem {
	u64 buf_ptr;
	u64 size;
	u64 shm_ref;
};

/**
 * struct optee_msg_param_rmem - registered memory reference parameter
 * @offs:	Offset into shared memory reference
 * @size:	Size of the buffer
 * @shm_ref:	Shared memory reference, pointer to a struct tee_shm
 */
struct optee_msg_param_rmem {
	u64 offs;
	u64 size;
	u64 shm_ref;
};

/**
 * struct optee_msg_param_value - opaque value parameter
 *
 * Value parameters are passed unchecked between normal and secure world.
 */
struct optee_msg_param_value {
	u64 a;
	u64 b;
	u64 c;
};

/**
 * struct optee_msg_param - parameter used together with struct optee_msg_arg
 * @attr:	attributes
 * @tmem:	parameter by temporary memory reference
 * @rmem:	parameter by registered memory reference
 * @value:	parameter by opaque value
 *
 * @attr & OPTEE_MSG_ATTR_TYPE_MASK indicates if tmem, rmem or value is used in
 * the union. OPTEE_MSG_ATTR_TYPE_VALUE_* indicates value,
 * OPTEE_MSG_ATTR_TYPE_TMEM_* indicates tmem and
 * OPTEE_MSG_ATTR_TYPE_RMEM_* indicates rmem.
 * OPTEE_MSG_ATTR_TYPE_NONE indicates that none of the members are used.
 */
struct optee_msg_param {
	u64 attr;
	union {
		struct optee_msg_param_tmem tmem;
		struct optee_msg_param_rmem rmem;
		struct optee_msg_param_value value;
	} u;
};

/**
 * struct optee_msg_arg - call argument
 * @cmd: Command, one of OPTEE_MSG_CMD_* or OPTEE_MSG_RPC_CMD_*
 * @func: Trusted Application function, specific to the Trusted Application,
 *	     used if cmd == OPTEE_MSG_CMD_INVOKE_COMMAND
 * @session: In parameter for all OPTEE_MSG_CMD_* except
 *	     OPTEE_MSG_CMD_OPEN_SESSION where it's an output parameter instead
 * @cancel_id: Cancellation id, a unique value to identify this request
 * @ret: return value
 * @ret_origin: origin of the return value
 * @num_params: number of parameters supplied to the OS Command
 * @params: the parameters supplied to the OS Command
 *
 * All normal calls to Trusted OS uses this struct. If cmd requires further
 * information than what these field holds it can be passed as a parameter
 * tagged as meta (setting the OPTEE_MSG_ATTR_META bit in corresponding
 * attrs field). All parameters tagged as meta has to come first.
 *
 * Temp memref parameters can be fragmented if supported by the Trusted OS
 * (when optee_smc.h is bearer of this protocol this is indicated with
 * OPTEE_SMC_SEC_CAP_UNREGISTERED_SHM). If a logical memref parameter is
 * fragmented then has all but the last fragment the
 * OPTEE_MSG_ATTR_FRAGMENT bit set in attrs. Even if a memref is fragmented
 * it will still be presented as a single logical memref to the Trusted
 * Application.
 */
struct optee_msg_arg {
	u32 cmd;
	u32 func;
	u32 session;
	u32 cancel_id;
	u32 pad;
	u32 ret;
	u32 ret_origin;
	u32 num_params;

	/* num_params tells the actual number of element in params */
	struct optee_msg_param params[0];
};

/**
 * OPTEE_MSG_GET_ARG_SIZE - return size of struct optee_msg_arg
 *
 * @num_params: Number of parameters embedded in the struct optee_msg_arg
 *
 * Returns the size of the struct optee_msg_arg together with the number
 * of embedded parameters.
 */
#define OPTEE_MSG_GET_ARG_SIZE(num_params) \
	(sizeof(struct optee_msg_arg) + \
	 sizeof(struct optee_msg_param) * (num_params))

/*****************************************************************************
 * Part 2 - requests from normal world
 *****************************************************************************/

/*
 * Return the following UID if using API specified in this file without
 * further extensions:
 * 384fb3e0-e7f8-11e3-af63-0002a5d5c51b.
 * Represented in 4 32-bit words in OPTEE_MSG_UID_0, OPTEE_MSG_UID_1,
 * OPTEE_MSG_UID_2, OPTEE_MSG_UID_3.
 */
#define OPTEE_MSG_UID_0			0x384fb3e0
#define OPTEE_MSG_UID_1			0xe7f811e3
#define OPTEE_MSG_UID_2			0xaf630002
#define OPTEE_MSG_UID_3			0xa5d5c51b
#define OPTEE_MSG_FUNCID_CALLS_UID	0xFF01

/*
 * Returns 2.0 if using API specified in this file without further
 * extensions. Represented in 2 32-bit words in OPTEE_MSG_REVISION_MAJOR
 * and OPTEE_MSG_REVISION_MINOR
 */
#define OPTEE_MSG_REVISION_MAJOR	2
#define OPTEE_MSG_REVISION_MINOR	0
#define OPTEE_MSG_FUNCID_CALLS_REVISION	0xFF03

/*
 * Get UUID of Trusted OS.
 *
 * Used by non-secure world to figure out which Trusted OS is installed.
 * Note that returned UUID is the UUID of the Trusted OS, not of the API.
 *
 * Returns UUID in 4 32-bit words in the same way as
 * OPTEE_MSG_FUNCID_CALLS_UID described above.
 */
#define OPTEE_MSG_OS_OPTEE_UUID_0	0x486178e0
#define OPTEE_MSG_OS_OPTEE_UUID_1	0xe7f811e3
#define OPTEE_MSG_OS_OPTEE_UUID_2	0xbc5e0002
#define OPTEE_MSG_OS_OPTEE_UUID_3	0xa5d5c51b
#define OPTEE_MSG_FUNCID_GET_OS_UUID	0x0000

/*
 * Get revision of Trusted OS.
 *
 * Used by non-secure world to figure out which version of the Trusted OS
 * is installed. Note that the returned revision is the revision of the
 * Trusted OS, not of the API.
 *
 * Returns revision in 2 32-bit words in the same way as
 * OPTEE_MSG_CALLS_REVISION described above.
 */
#define OPTEE_MSG_FUNCID_GET_OS_REVISION	0x0001

/*
 * Do a secure call with struct optee_msg_arg as argument
 * The OPTEE_MSG_CMD_* below defines what goes in struct optee_msg_arg::cmd
 *
 * OPTEE_MSG_CMD_OPEN_SESSION opens a session to a Trusted Application.
 * The first two parameters are tagged as meta, holding two value
 * parameters to pass the following information:
 * param[0].u.value.a-b uuid of Trusted Application
 * param[1].u.value.a-b uuid of Client
 * param[1].u.value.c Login class of client OPTEE_MSG_LOGIN_*
 *
 * OPTEE_MSG_CMD_INVOKE_COMMAND invokes a command a previously opened
 * session to a Trusted Application.  struct optee_msg_arg::func is Trusted
 * Application function, specific to the Trusted Application.
 *
 * OPTEE_MSG_CMD_CLOSE_SESSION closes a previously opened session to
 * Trusted Application.
 *
 * OPTEE_MSG_CMD_CANCEL cancels a currently invoked command.
 *
 * OPTEE_MSG_CMD_REGISTER_SHM registers a shared memory reference. The
 * information is passed as:
 * [in] param[0].attr			OPTEE_MSG_ATTR_TYPE_TMEM_INPUT
 *					[| OPTEE_MSG_ATTR_FRAGMENT]
 * [in] param[0].u.tmem.buf_ptr		physical address (of first fragment)
 * [in] param[0].u.tmem.size		size (of first fragment)
 * [in] param[0].u.tmem.shm_ref		holds shared memory reference
 * ...
 * The shared memory can optionally be fragmented, temp memrefs can follow
 * each other with all but the last with the OPTEE_MSG_ATTR_FRAGMENT bit set.
 *
 * OPTEE_MSG_CMD_UNREGISTER_SHM unregisteres a previously registered shared
 * memory reference. The information is passed as:
 * [in] param[0].attr			OPTEE_MSG_ATTR_TYPE_RMEM_INPUT
 * [in] param[0].u.rmem.shm_ref		holds shared memory reference
 * [in] param[0].u.rmem.offs		0
 * [in] param[0].u.rmem.size		0
 */
#define OPTEE_MSG_CMD_OPEN_SESSION	0
#define OPTEE_MSG_CMD_INVOKE_COMMAND	1
#define OPTEE_MSG_CMD_CLOSE_SESSION	2
#define OPTEE_MSG_CMD_CANCEL		3
#define OPTEE_MSG_CMD_REGISTER_SHM	4
#define OPTEE_MSG_CMD_UNREGISTER_SHM	5
#define OPTEE_MSG_FUNCID_CALL_WITH_ARG	0x0004

/*****************************************************************************
 * Part 3 - Requests from secure world, RPC
 *****************************************************************************/

/*
 * All RPC is done with a struct optee_msg_arg as bearer of information,
 * struct optee_msg_arg::arg holds values defined by OPTEE_MSG_RPC_CMD_* below
 *
 * RPC communication with tee-supplicant is reversed compared to normal
 * client communication desribed above. The supplicant receives requests
 * and sends responses.
 */

/*
 * Load a TA into memory, defined in tee-supplicant
 */
#define OPTEE_MSG_RPC_CMD_LOAD_TA	0

/*
 * Reserved
 */
#define OPTEE_MSG_RPC_CMD_RPMB		1

/*
 * File system access, defined in tee-supplicant
 */
#define OPTEE_MSG_RPC_CMD_FS		2

/*
 * Get time
 *
 * Returns number of seconds and nano seconds since the Epoch,
 * 1970-01-01 00:00:00 +0000 (UTC).
 *
 * [out] param[0].u.value.a	Number of seconds
 * [out] param[0].u.value.b	Number of nano seconds.
 */
#define OPTEE_MSG_RPC_CMD_GET_TIME	3

/*
 * Wait queue primitive, helper for secure world to implement a wait queue.
 *
 * If secure world need to wait for a secure world mutex it issues a sleep
 * request instead of spinning in secure world. Conversely is a wakeup
 * request issued when a secure world mutex with a thread waiting thread is
 * unlocked.
 *
 * Waiting on a key
 * [in] param[0].u.value.a OPTEE_MSG_RPC_WAIT_QUEUE_SLEEP
 * [in] param[0].u.value.b wait key
 *
 * Waking up a key
 * [in] param[0].u.value.a OPTEE_MSG_RPC_WAIT_QUEUE_WAKEUP
 * [in] param[0].u.value.b wakeup key
 */
#define OPTEE_MSG_RPC_CMD_WAIT_QUEUE	4
#define OPTEE_MSG_RPC_WAIT_QUEUE_SLEEP	0
#define OPTEE_MSG_RPC_WAIT_QUEUE_WAKEUP	1

/*
 * Suspend execution
 *
 * [in] param[0].value	.a number of milliseconds to suspend
 */
#define OPTEE_MSG_RPC_CMD_SUSPEND	5

/*
 * Allocate a piece of shared memory
 *
 * Shared memory can optionally be fragmented, to support that additional
 * spare param entries are allocated to make room for eventual fragments.
 * The spare param entries has .attr = OPTEE_MSG_ATTR_TYPE_NONE when
 * unused. All returned temp memrefs except the last should have the
 * OPTEE_MSG_ATTR_FRAGMENT bit set in the attr field.
 *
 * [in]  param[0].u.value.a		type of memory one of
 *					OPTEE_MSG_RPC_SHM_TYPE_* below
 * [in]  param[0].u.value.b		requested size
 * [in]  param[0].u.value.c		required alignment
 *
 * [out] param[0].u.tmem.buf_ptr	physical address (of first fragment)
 * [out] param[0].u.tmem.size		size (of first fragment)
 * [out] param[0].u.tmem.shm_ref	shared memory reference
 * ...
 * [out] param[n].u.tmem.buf_ptr	physical address
 * [out] param[n].u.tmem.size		size
 * [out] param[n].u.tmem.shm_ref	shared memory reference (same value
 *					as in param[n-1].u.tmem.shm_ref)
 */
#define OPTEE_MSG_RPC_CMD_SHM_ALLOC	6
/* Memory that can be shared with a non-secure user space application */
#define OPTEE_MSG_RPC_SHM_TYPE_APPL	0
/* Memory only shared with non-secure kernel */
#define OPTEE_MSG_RPC_SHM_TYPE_KERNEL	1

/*
 * Free shared memory previously allocated with OPTEE_MSG_RPC_CMD_SHM_ALLOC
 *
 * [in]  param[0].u.value.a		type of memory one of
 *					OPTEE_MSG_RPC_SHM_TYPE_* above
 * [in]  param[0].u.value.b		value of shared memory reference
 *					returned in param[0].u.tmem.shm_ref
 *					above
 */
#define OPTEE_MSG_RPC_CMD_SHM_FREE	7

#endif /* _OPTEE_MSG_H */