1 /* 2 * Copyright (c) 2015-2016, Linaro Limited 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright notice, 9 * this list of conditions and the following disclaimer. 10 * 11 * 2. Redistributions in binary form must reproduce the above copyright notice, 12 * this list of conditions and the following disclaimer in the documentation 13 * and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 19 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 20 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 21 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 24 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 25 * POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #ifndef __TEE_H 29 #define __TEE_H 30 31 #include <linux/ioctl.h> 32 #include <linux/types.h> 33 34 /* 35 * This file describes the API provided by a TEE driver to user space. 36 * 37 * Each TEE driver defines a TEE specific protocol which is used for the 38 * data passed back and forth using TEE_IOC_CMD. 39 */ 40 41 /* Helpers to make the ioctl defines */ 42 #define TEE_IOC_MAGIC 0xa4 43 #define TEE_IOC_BASE 0 44 45 /* Flags relating to shared memory */ 46 #define TEE_IOCTL_SHM_MAPPED 0x1 /* memory mapped in normal world */ 47 #define TEE_IOCTL_SHM_DMA_BUF 0x2 /* dma-buf handle on shared memory */ 48 49 #define TEE_MAX_ARG_SIZE 1024 50 51 #define TEE_GEN_CAP_GP (1 << 0)/* GlobalPlatform compliant TEE */ 52 #define TEE_GEN_CAP_PRIVILEGED (1 << 1)/* Privileged device (for supplicant) */ 53 #define TEE_GEN_CAP_REG_MEM (1 << 2)/* Supports registering shared memory */ 54 55 /* 56 * TEE Implementation ID 57 */ 58 #define TEE_IMPL_ID_OPTEE 1 59 #define TEE_IMPL_ID_AMDTEE 2 60 61 /* 62 * OP-TEE specific capabilities 63 */ 64 #define TEE_OPTEE_CAP_TZ (1 << 0) 65 66 /** 67 * struct tee_ioctl_version_data - TEE version 68 * @impl_id: [out] TEE implementation id 69 * @impl_caps: [out] Implementation specific capabilities 70 * @gen_caps: [out] Generic capabilities, defined by TEE_GEN_CAPS_* above 71 * 72 * Identifies the TEE implementation, @impl_id is one of TEE_IMPL_ID_* above. 73 * @impl_caps is implementation specific, for example TEE_OPTEE_CAP_* 74 * is valid when @impl_id == TEE_IMPL_ID_OPTEE. 75 */ 76 struct tee_ioctl_version_data { 77 __u32 impl_id; 78 __u32 impl_caps; 79 __u32 gen_caps; 80 }; 81 82 /** 83 * TEE_IOC_VERSION - query version of TEE 84 * 85 * Takes a tee_ioctl_version_data struct and returns with the TEE version 86 * data filled in. 87 */ 88 #define TEE_IOC_VERSION _IOR(TEE_IOC_MAGIC, TEE_IOC_BASE + 0, \ 89 struct tee_ioctl_version_data) 90 91 /** 92 * struct tee_ioctl_shm_alloc_data - Shared memory allocate argument 93 * @size: [in/out] Size of shared memory to allocate 94 * @flags: [in/out] Flags to/from allocation. 95 * @id: [out] Identifier of the shared memory 96 * 97 * The flags field should currently be zero as input. Updated by the call 98 * with actual flags as defined by TEE_IOCTL_SHM_* above. 99 * This structure is used as argument for TEE_IOC_SHM_ALLOC below. 100 */ 101 struct tee_ioctl_shm_alloc_data { 102 __u64 size; 103 __u32 flags; 104 __s32 id; 105 }; 106 107 /** 108 * TEE_IOC_SHM_ALLOC - allocate shared memory 109 * 110 * Allocates shared memory between the user space process and secure OS. 111 * 112 * Returns a file descriptor on success or < 0 on failure 113 * 114 * The returned file descriptor is used to map the shared memory into user 115 * space. The shared memory is freed when the descriptor is closed and the 116 * memory is unmapped. 117 */ 118 #define TEE_IOC_SHM_ALLOC _IOWR(TEE_IOC_MAGIC, TEE_IOC_BASE + 1, \ 119 struct tee_ioctl_shm_alloc_data) 120 121 /** 122 * struct tee_ioctl_buf_data - Variable sized buffer 123 * @buf_ptr: [in] A __user pointer to a buffer 124 * @buf_len: [in] Length of the buffer above 125 * 126 * Used as argument for TEE_IOC_OPEN_SESSION, TEE_IOC_INVOKE, 127 * TEE_IOC_SUPPL_RECV, and TEE_IOC_SUPPL_SEND below. 128 */ 129 struct tee_ioctl_buf_data { 130 __u64 buf_ptr; 131 __u64 buf_len; 132 }; 133 134 /* 135 * Attributes for struct tee_ioctl_param, selects field in the union 136 */ 137 #define TEE_IOCTL_PARAM_ATTR_TYPE_NONE 0 /* parameter not used */ 138 139 /* 140 * These defines value parameters (struct tee_ioctl_param_value) 141 */ 142 #define TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT 1 143 #define TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT 2 144 #define TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT 3 /* input and output */ 145 146 /* 147 * These defines shared memory reference parameters (struct 148 * tee_ioctl_param_memref) 149 */ 150 #define TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT 5 151 #define TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT 6 152 #define TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT 7 /* input and output */ 153 154 /* 155 * Mask for the type part of the attribute, leaves room for more types 156 */ 157 #define TEE_IOCTL_PARAM_ATTR_TYPE_MASK 0xff 158 159 /* Meta parameter carrying extra information about the message. */ 160 #define TEE_IOCTL_PARAM_ATTR_META 0x100 161 162 /* Mask of all known attr bits */ 163 #define TEE_IOCTL_PARAM_ATTR_MASK \ 164 (TEE_IOCTL_PARAM_ATTR_TYPE_MASK | TEE_IOCTL_PARAM_ATTR_META) 165 166 /* 167 * Matches TEEC_LOGIN_* in GP TEE Client API 168 * Are only defined for GP compliant TEEs 169 */ 170 #define TEE_IOCTL_LOGIN_PUBLIC 0 171 #define TEE_IOCTL_LOGIN_USER 1 172 #define TEE_IOCTL_LOGIN_GROUP 2 173 #define TEE_IOCTL_LOGIN_APPLICATION 4 174 #define TEE_IOCTL_LOGIN_USER_APPLICATION 5 175 #define TEE_IOCTL_LOGIN_GROUP_APPLICATION 6 176 177 /** 178 * struct tee_ioctl_param - parameter 179 * @attr: attributes 180 * @a: if a memref, offset into the shared memory object, else a value parameter 181 * @b: if a memref, size of the buffer, else a value parameter 182 * @c: if a memref, shared memory identifier, else a value parameter 183 * 184 * @attr & TEE_PARAM_ATTR_TYPE_MASK indicates if memref or value is used in 185 * the union. TEE_PARAM_ATTR_TYPE_VALUE_* indicates value and 186 * TEE_PARAM_ATTR_TYPE_MEMREF_* indicates memref. TEE_PARAM_ATTR_TYPE_NONE 187 * indicates that none of the members are used. 188 * 189 * Shared memory is allocated with TEE_IOC_SHM_ALLOC which returns an 190 * identifier representing the shared memory object. A memref can reference 191 * a part of a shared memory by specifying an offset (@a) and size (@b) of 192 * the object. To supply the entire shared memory object set the offset 193 * (@a) to 0 and size (@b) to the previously returned size of the object. 194 */ 195 struct tee_ioctl_param { 196 __u64 attr; 197 __u64 a; 198 __u64 b; 199 __u64 c; 200 }; 201 202 #define TEE_IOCTL_UUID_LEN 16 203 204 /** 205 * struct tee_ioctl_open_session_arg - Open session argument 206 * @uuid: [in] UUID of the Trusted Application 207 * @clnt_uuid: [in] UUID of client 208 * @clnt_login: [in] Login class of client, TEE_IOCTL_LOGIN_* above 209 * @cancel_id: [in] Cancellation id, a unique value to identify this request 210 * @session: [out] Session id 211 * @ret: [out] return value 212 * @ret_origin [out] origin of the return value 213 * @num_params [in] number of parameters following this struct 214 */ 215 struct tee_ioctl_open_session_arg { 216 __u8 uuid[TEE_IOCTL_UUID_LEN]; 217 __u8 clnt_uuid[TEE_IOCTL_UUID_LEN]; 218 __u32 clnt_login; 219 __u32 cancel_id; 220 __u32 session; 221 __u32 ret; 222 __u32 ret_origin; 223 __u32 num_params; 224 /* num_params tells the actual number of element in params */ 225 struct tee_ioctl_param params[]; 226 }; 227 228 /** 229 * TEE_IOC_OPEN_SESSION - opens a session to a Trusted Application 230 * 231 * Takes a struct tee_ioctl_buf_data which contains a struct 232 * tee_ioctl_open_session_arg followed by any array of struct 233 * tee_ioctl_param 234 */ 235 #define TEE_IOC_OPEN_SESSION _IOR(TEE_IOC_MAGIC, TEE_IOC_BASE + 2, \ 236 struct tee_ioctl_buf_data) 237 238 /** 239 * struct tee_ioctl_invoke_func_arg - Invokes a function in a Trusted 240 * Application 241 * @func: [in] Trusted Application function, specific to the TA 242 * @session: [in] Session id 243 * @cancel_id: [in] Cancellation id, a unique value to identify this request 244 * @ret: [out] return value 245 * @ret_origin [out] origin of the return value 246 * @num_params [in] number of parameters following this struct 247 */ 248 struct tee_ioctl_invoke_arg { 249 __u32 func; 250 __u32 session; 251 __u32 cancel_id; 252 __u32 ret; 253 __u32 ret_origin; 254 __u32 num_params; 255 /* num_params tells the actual number of element in params */ 256 struct tee_ioctl_param params[]; 257 }; 258 259 /** 260 * TEE_IOC_INVOKE - Invokes a function in a Trusted Application 261 * 262 * Takes a struct tee_ioctl_buf_data which contains a struct 263 * tee_invoke_func_arg followed by any array of struct tee_param 264 */ 265 #define TEE_IOC_INVOKE _IOR(TEE_IOC_MAGIC, TEE_IOC_BASE + 3, \ 266 struct tee_ioctl_buf_data) 267 268 /** 269 * struct tee_ioctl_cancel_arg - Cancels an open session or invoke ioctl 270 * @cancel_id: [in] Cancellation id, a unique value to identify this request 271 * @session: [in] Session id, if the session is opened, else set to 0 272 */ 273 struct tee_ioctl_cancel_arg { 274 __u32 cancel_id; 275 __u32 session; 276 }; 277 278 /** 279 * TEE_IOC_CANCEL - Cancels an open session or invoke 280 */ 281 #define TEE_IOC_CANCEL _IOR(TEE_IOC_MAGIC, TEE_IOC_BASE + 4, \ 282 struct tee_ioctl_cancel_arg) 283 284 /** 285 * struct tee_ioctl_close_session_arg - Closes an open session 286 * @session: [in] Session id 287 */ 288 struct tee_ioctl_close_session_arg { 289 __u32 session; 290 }; 291 292 /** 293 * TEE_IOC_CLOSE_SESSION - Closes a session 294 */ 295 #define TEE_IOC_CLOSE_SESSION _IOR(TEE_IOC_MAGIC, TEE_IOC_BASE + 5, \ 296 struct tee_ioctl_close_session_arg) 297 298 /** 299 * struct tee_iocl_supp_recv_arg - Receive a request for a supplicant function 300 * @func: [in] supplicant function 301 * @num_params [in/out] number of parameters following this struct 302 * 303 * @num_params is the number of params that tee-supplicant has room to 304 * receive when input, @num_params is the number of actual params 305 * tee-supplicant receives when output. 306 */ 307 struct tee_iocl_supp_recv_arg { 308 __u32 func; 309 __u32 num_params; 310 /* num_params tells the actual number of element in params */ 311 struct tee_ioctl_param params[]; 312 }; 313 314 /** 315 * TEE_IOC_SUPPL_RECV - Receive a request for a supplicant function 316 * 317 * Takes a struct tee_ioctl_buf_data which contains a struct 318 * tee_iocl_supp_recv_arg followed by any array of struct tee_param 319 */ 320 #define TEE_IOC_SUPPL_RECV _IOR(TEE_IOC_MAGIC, TEE_IOC_BASE + 6, \ 321 struct tee_ioctl_buf_data) 322 323 /** 324 * struct tee_iocl_supp_send_arg - Send a response to a received request 325 * @ret: [out] return value 326 * @num_params [in] number of parameters following this struct 327 */ 328 struct tee_iocl_supp_send_arg { 329 __u32 ret; 330 __u32 num_params; 331 /* num_params tells the actual number of element in params */ 332 struct tee_ioctl_param params[]; 333 }; 334 335 /** 336 * TEE_IOC_SUPPL_SEND - Receive a request for a supplicant function 337 * 338 * Takes a struct tee_ioctl_buf_data which contains a struct 339 * tee_iocl_supp_send_arg followed by any array of struct tee_param 340 */ 341 #define TEE_IOC_SUPPL_SEND _IOR(TEE_IOC_MAGIC, TEE_IOC_BASE + 7, \ 342 struct tee_ioctl_buf_data) 343 344 /** 345 * struct tee_ioctl_shm_register_data - Shared memory register argument 346 * @addr: [in] Start address of shared memory to register 347 * @length: [in/out] Length of shared memory to register 348 * @flags: [in/out] Flags to/from registration. 349 * @id: [out] Identifier of the shared memory 350 * 351 * The flags field should currently be zero as input. Updated by the call 352 * with actual flags as defined by TEE_IOCTL_SHM_* above. 353 * This structure is used as argument for TEE_IOC_SHM_REGISTER below. 354 */ 355 struct tee_ioctl_shm_register_data { 356 __u64 addr; 357 __u64 length; 358 __u32 flags; 359 __s32 id; 360 }; 361 362 /** 363 * TEE_IOC_SHM_REGISTER - Register shared memory argument 364 * 365 * Registers shared memory between the user space process and secure OS. 366 * 367 * Returns a file descriptor on success or < 0 on failure 368 * 369 * The shared memory is unregisterred when the descriptor is closed. 370 */ 371 #define TEE_IOC_SHM_REGISTER _IOWR(TEE_IOC_MAGIC, TEE_IOC_BASE + 9, \ 372 struct tee_ioctl_shm_register_data) 373 /* 374 * Five syscalls are used when communicating with the TEE driver. 375 * open(): opens the device associated with the driver 376 * ioctl(): as described above operating on the file descriptor from open() 377 * close(): two cases 378 * - closes the device file descriptor 379 * - closes a file descriptor connected to allocated shared memory 380 * mmap(): maps shared memory into user space using information from struct 381 * tee_ioctl_shm_alloc_data 382 * munmap(): unmaps previously shared memory 383 */ 384 385 #endif /*__TEE_H*/ 386