include/uapi/linux/tee.h

   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
  54 /*
  55  * TEE Implementation ID
  56  */
  57 #define TEE_IMPL_ID_OPTEE       1
  58
  59 /*
  60  * OP-TEE specific capabilities
  61  */
  62 #define TEE_OPTEE_CAP_TZ        (1 << 0)
  63
  64 /**
  65  * struct tee_ioctl_version_data - TEE version
  66  * @impl_id:    [out] TEE implementation id
  67  * @impl_caps:  [out] Implementation specific capabilities
  68  * @gen_caps:   [out] Generic capabilities, defined by TEE_GEN_CAPS_* above
  69  *
  70  * Identifies the TEE implementation, @impl_id is one of TEE_IMPL_ID_* above.
  71  * @impl_caps is implementation specific, for example TEE_OPTEE_CAP_*
  72  * is valid when @impl_id == TEE_IMPL_ID_OPTEE.
  73  */
  74 struct tee_ioctl_version_data {
  75         __u32 impl_id;
  76         __u32 impl_caps;
  77         __u32 gen_caps;
  78 };
  79
  80 /**
  81  * TEE_IOC_VERSION - query version of TEE
  82  *
  83  * Takes a tee_ioctl_version_data struct and returns with the TEE version
  84  * data filled in.
  85  */
  86 #define TEE_IOC_VERSION         _IOR(TEE_IOC_MAGIC, TEE_IOC_BASE + 0, \
  87                                      struct tee_ioctl_version_data)
  88
  89 /**
  90  * struct tee_ioctl_shm_alloc_data - Shared memory allocate argument
  91  * @size:       [in/out] Size of shared memory to allocate
  92  * @flags:      [in/out] Flags to/from allocation.
  93  * @id:         [out] Identifier of the shared memory
  94  *
  95  * The flags field should currently be zero as input. Updated by the call
  96  * with actual flags as defined by TEE_IOCTL_SHM_* above.
  97  * This structure is used as argument for TEE_IOC_SHM_ALLOC below.
  98  */
  99 struct tee_ioctl_shm_alloc_data {
 100         __u64 size;
 101         __u32 flags;
 102         __s32 id;
 103 };
 104
 105 /**
 106  * TEE_IOC_SHM_ALLOC - allocate shared memory
 107  *
 108  * Allocates shared memory between the user space process and secure OS.
 109  *
 110  * Returns a file descriptor on success or < 0 on failure
 111  *
 112  * The returned file descriptor is used to map the shared memory into user
 113  * space. The shared memory is freed when the descriptor is closed and the
 114  * memory is unmapped.
 115  */
 116 #define TEE_IOC_SHM_ALLOC       _IOWR(TEE_IOC_MAGIC, TEE_IOC_BASE + 1, \
 117                                      struct tee_ioctl_shm_alloc_data)
 118
 119 /**
 120  * struct tee_ioctl_buf_data - Variable sized buffer
 121  * @buf_ptr:    [in] A __user pointer to a buffer
 122  * @buf_len:    [in] Length of the buffer above
 123  *
 124  * Used as argument for TEE_IOC_OPEN_SESSION, TEE_IOC_INVOKE,
 125  * TEE_IOC_SUPPL_RECV, and TEE_IOC_SUPPL_SEND below.
 126  */
 127 struct tee_ioctl_buf_data {
 128         __u64 buf_ptr;
 129         __u64 buf_len;
 130 };
 131
 132 /*
 133  * Attributes for struct tee_ioctl_param, selects field in the union
 134  */
 135 #define TEE_IOCTL_PARAM_ATTR_TYPE_NONE          0       /* parameter not used */
 136
 137 /*
 138  * These defines value parameters (struct tee_ioctl_param_value)
 139  */
 140 #define TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT   1
 141 #define TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT  2
 142 #define TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT   3       /* input and output */
 143
 144 /*
 145  * These defines shared memory reference parameters (struct
 146  * tee_ioctl_param_memref)
 147  */
 148 #define TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT  5
 149 #define TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT 6
 150 #define TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT  7       /* input and output */
 151
 152 /*
 153  * Mask for the type part of the attribute, leaves room for more types
 154  */
 155 #define TEE_IOCTL_PARAM_ATTR_TYPE_MASK          0xff
 156
 157 /*
 158  * Matches TEEC_LOGIN_* in GP TEE Client API
 159  * Are only defined for GP compliant TEEs
 160  */
 161 #define TEE_IOCTL_LOGIN_PUBLIC                  0
 162 #define TEE_IOCTL_LOGIN_USER                    1
 163 #define TEE_IOCTL_LOGIN_GROUP                   2
 164 #define TEE_IOCTL_LOGIN_APPLICATION             4
 165 #define TEE_IOCTL_LOGIN_USER_APPLICATION        5
 166 #define TEE_IOCTL_LOGIN_GROUP_APPLICATION       6
 167
 168 /**
 169  * struct tee_ioctl_param - parameter
 170  * @attr: attributes
 171  * @a: if a memref, offset into the shared memory object, else a value parameter
 172  * @b: if a memref, size of the buffer, else a value parameter
 173  * @c: if a memref, shared memory identifier, else a value parameter
 174  *
 175  * @attr & TEE_PARAM_ATTR_TYPE_MASK indicates if memref or value is used in
 176  * the union. TEE_PARAM_ATTR_TYPE_VALUE_* indicates value and
 177  * TEE_PARAM_ATTR_TYPE_MEMREF_* indicates memref. TEE_PARAM_ATTR_TYPE_NONE
 178  * indicates that none of the members are used.
 179  *
 180  * Shared memory is allocated with TEE_IOC_SHM_ALLOC which returns an
 181  * identifier representing the shared memory object. A memref can reference
 182  * a part of a shared memory by specifying an offset (@a) and size (@b) of
 183  * the object. To supply the entire shared memory object set the offset
 184  * (@a) to 0 and size (@b) to the previously returned size of the object.
 185  */
 186 struct tee_ioctl_param {
 187         __u64 attr;
 188         __u64 a;
 189         __u64 b;
 190         __u64 c;
 191 };
 192
 193 #define TEE_IOCTL_UUID_LEN              16
 194
 195 /**
 196  * struct tee_ioctl_open_session_arg - Open session argument
 197  * @uuid:       [in] UUID of the Trusted Application
 198  * @clnt_uuid:  [in] UUID of client
 199  * @clnt_login: [in] Login class of client, TEE_IOCTL_LOGIN_* above
 200  * @cancel_id:  [in] Cancellation id, a unique value to identify this request
 201  * @session:    [out] Session id
 202  * @ret:        [out] return value
 203  * @ret_origin  [out] origin of the return value
 204  * @num_params  [in] number of parameters following this struct
 205  */
 206 struct tee_ioctl_open_session_arg {
 207         __u8 uuid[TEE_IOCTL_UUID_LEN];
 208         __u8 clnt_uuid[TEE_IOCTL_UUID_LEN];
 209         __u32 clnt_login;
 210         __u32 cancel_id;
 211         __u32 session;
 212         __u32 ret;
 213         __u32 ret_origin;
 214         __u32 num_params;
 215         /* num_params tells the actual number of element in params */
 216         struct tee_ioctl_param params[];
 217 };
 218
 219 /**
 220  * TEE_IOC_OPEN_SESSION - opens a session to a Trusted Application
 221  *
 222  * Takes a struct tee_ioctl_buf_data which contains a struct
 223  * tee_ioctl_open_session_arg followed by any array of struct
 224  * tee_ioctl_param
 225  */
 226 #define TEE_IOC_OPEN_SESSION    _IOR(TEE_IOC_MAGIC, TEE_IOC_BASE + 2, \
 227                                      struct tee_ioctl_buf_data)
 228
 229 /**
 230  * struct tee_ioctl_invoke_func_arg - Invokes a function in a Trusted
 231  * Application
 232  * @func:       [in] Trusted Application function, specific to the TA
 233  * @session:    [in] Session id
 234  * @cancel_id:  [in] Cancellation id, a unique value to identify this request
 235  * @ret:        [out] return value
 236  * @ret_origin  [out] origin of the return value
 237  * @num_params  [in] number of parameters following this struct
 238  */
 239 struct tee_ioctl_invoke_arg {
 240         __u32 func;
 241         __u32 session;
 242         __u32 cancel_id;
 243         __u32 ret;
 244         __u32 ret_origin;
 245         __u32 num_params;
 246         /* num_params tells the actual number of element in params */
 247         struct tee_ioctl_param params[];
 248 };
 249
 250 /**
 251  * TEE_IOC_INVOKE - Invokes a function in a Trusted Application
 252  *
 253  * Takes a struct tee_ioctl_buf_data which contains a struct
 254  * tee_invoke_func_arg followed by any array of struct tee_param
 255  */
 256 #define TEE_IOC_INVOKE          _IOR(TEE_IOC_MAGIC, TEE_IOC_BASE + 3, \
 257                                      struct tee_ioctl_buf_data)
 258
 259 /**
 260  * struct tee_ioctl_cancel_arg - Cancels an open session or invoke ioctl
 261  * @cancel_id:  [in] Cancellation id, a unique value to identify this request
 262  * @session:    [in] Session id, if the session is opened, else set to 0
 263  */
 264 struct tee_ioctl_cancel_arg {
 265         __u32 cancel_id;
 266         __u32 session;
 267 };
 268
 269 /**
 270  * TEE_IOC_CANCEL - Cancels an open session or invoke
 271  */
 272 #define TEE_IOC_CANCEL          _IOR(TEE_IOC_MAGIC, TEE_IOC_BASE + 4, \
 273                                      struct tee_ioctl_cancel_arg)
 274
 275 /**
 276  * struct tee_ioctl_close_session_arg - Closes an open session
 277  * @session:    [in] Session id
 278  */
 279 struct tee_ioctl_close_session_arg {
 280         __u32 session;
 281 };
 282
 283 /**
 284  * TEE_IOC_CLOSE_SESSION - Closes a session
 285  */
 286 #define TEE_IOC_CLOSE_SESSION   _IOR(TEE_IOC_MAGIC, TEE_IOC_BASE + 5, \
 287                                      struct tee_ioctl_close_session_arg)
 288
 289 /**
 290  * struct tee_iocl_supp_recv_arg - Receive a request for a supplicant function
 291  * @func:       [in] supplicant function
 292  * @num_params  [in/out] number of parameters following this struct
 293  *
 294  * @num_params is the number of params that tee-supplicant has room to
 295  * receive when input, @num_params is the number of actual params
 296  * tee-supplicant receives when output.
 297  */
 298 struct tee_iocl_supp_recv_arg {
 299         __u32 func;
 300         __u32 num_params;
 301         /* num_params tells the actual number of element in params */
 302         struct tee_ioctl_param params[];
 303 };
 304
 305 /**
 306  * TEE_IOC_SUPPL_RECV - Receive a request for a supplicant function
 307  *
 308  * Takes a struct tee_ioctl_buf_data which contains a struct
 309  * tee_iocl_supp_recv_arg followed by any array of struct tee_param
 310  */
 311 #define TEE_IOC_SUPPL_RECV      _IOR(TEE_IOC_MAGIC, TEE_IOC_BASE + 6, \
 312                                      struct tee_ioctl_buf_data)
 313
 314 /**
 315  * struct tee_iocl_supp_send_arg - Send a response to a received request
 316  * @ret:        [out] return value
 317  * @num_params  [in] number of parameters following this struct
 318  */
 319 struct tee_iocl_supp_send_arg {
 320         __u32 ret;
 321         __u32 num_params;
 322         /* num_params tells the actual number of element in params */
 323         struct tee_ioctl_param params[];
 324 };
 325
 326 /**
 327  * TEE_IOC_SUPPL_SEND - Receive a request for a supplicant function
 328  *
 329  * Takes a struct tee_ioctl_buf_data which contains a struct
 330  * tee_iocl_supp_send_arg followed by any array of struct tee_param
 331  */
 332 #define TEE_IOC_SUPPL_SEND      _IOR(TEE_IOC_MAGIC, TEE_IOC_BASE + 7, \
 333                                      struct tee_ioctl_buf_data)
 334
 335 /*
 336  * Five syscalls are used when communicating with the TEE driver.
 337  * open(): opens the device associated with the driver
 338  * ioctl(): as described above operating on the file descriptor from open()
 339  * close(): two cases
 340  *   - closes the device file descriptor
 341  *   - closes a file descriptor connected to allocated shared memory
 342  * mmap(): maps shared memory into user space using information from struct
 343  *         tee_ioctl_shm_alloc_data
 344  * munmap(): unmaps previously shared memory
 345  */
 346
 347 #endif /*__TEE_H*/