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/* * 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 __TEE_H #define __TEE_H #include <linux/ioctl.h> #include <linux/types.h> /* * This file describes the API provided by a TEE driver to user space. * * Each TEE driver defines a TEE specific protocol which is used for the * data passed back and forth using TEE_IOC_CMD. */ /* Helpers to make the ioctl defines */ #define TEE_IOC_MAGIC 0xa4 #define TEE_IOC_BASE 0 /* Flags relating to shared memory */ #define TEE_IOCTL_SHM_MAPPED 0x1 /* memory mapped in normal world */ #define TEE_IOCTL_SHM_DMA_BUF 0x2 /* dma-buf handle on shared memory */ #define TEE_MAX_ARG_SIZE 1024 #define TEE_GEN_CAP_GP (1 << 0)/* GlobalPlatform compliant TEE */ #define TEE_GEN_CAP_PRIVILEGED (1 << 1)/* Privileged device (for supplicant) */ #define TEE_GEN_CAP_REG_MEM (1 << 2)/* Supports registering shared memory */ #define TEE_GEN_CAP_MEMREF_NULL (1 << 3)/* NULL MemRef support */ #define TEE_MEMREF_NULL (__u64)(-1) /* NULL MemRef Buffer */ /* * TEE Implementation ID */ #define TEE_IMPL_ID_OPTEE 1 /* * OP-TEE specific capabilities */ #define TEE_OPTEE_CAP_TZ (1 << 0) /** * struct tee_ioctl_version_data - TEE version * @impl_id: [out] TEE implementation id * @impl_caps: [out] Implementation specific capabilities * @gen_caps: [out] Generic capabilities, defined by TEE_GEN_CAPS_* above * * Identifies the TEE implementation, @impl_id is one of TEE_IMPL_ID_* above. * @impl_caps is implementation specific, for example TEE_OPTEE_CAP_* * is valid when @impl_id == TEE_IMPL_ID_OPTEE. */ struct tee_ioctl_version_data { __u32 impl_id; __u32 impl_caps; __u32 gen_caps; }; /** * TEE_IOC_VERSION - query version of TEE * * Takes a tee_ioctl_version_data struct and returns with the TEE version * data filled in. */ #define TEE_IOC_VERSION _IOR(TEE_IOC_MAGIC, TEE_IOC_BASE + 0, \ struct tee_ioctl_version_data) /** * struct tee_ioctl_shm_alloc_data - Shared memory allocate argument * @size: [in/out] Size of shared memory to allocate * @flags: [in/out] Flags to/from allocation. * @id: [out] Identifier of the shared memory * * The flags field should currently be zero as input. Updated by the call * with actual flags as defined by TEE_IOCTL_SHM_* above. * This structure is used as argument for TEE_IOC_SHM_ALLOC below. */ struct tee_ioctl_shm_alloc_data { __u64 size; __u32 flags; __s32 id; }; /** * TEE_IOC_SHM_ALLOC - allocate shared memory * * Allocates shared memory between the user space process and secure OS. * * Returns a file descriptor on success or < 0 on failure * * The returned file descriptor is used to map the shared memory into user * space. The shared memory is freed when the descriptor is closed and the * memory is unmapped. */ #define TEE_IOC_SHM_ALLOC _IOWR(TEE_IOC_MAGIC, TEE_IOC_BASE + 1, \ struct tee_ioctl_shm_alloc_data) /** * struct tee_ioctl_buf_data - Variable sized buffer * @buf_ptr: [in] A pointer to a buffer * @buf_len: [in] Length of the buffer above * * Used as argument for TEE_IOC_OPEN_SESSION, TEE_IOC_INVOKE, * TEE_IOC_SUPPL_RECV, and TEE_IOC_SUPPL_SEND below. */ struct tee_ioctl_buf_data { __u64 buf_ptr; __u64 buf_len; }; /* * Attributes for struct tee_ioctl_param, selects field in the union */ #define TEE_IOCTL_PARAM_ATTR_TYPE_NONE 0 /* parameter not used */ /* * These defines value parameters (struct tee_ioctl_param_value) */ #define TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT 1 #define TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT 2 #define TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT 3 /* input and output */ /* * These defines shared memory reference parameters (struct * tee_ioctl_param_memref) */ #define TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT 5 #define TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT 6 #define TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT 7 /* input and output */ /* * Mask for the type part of the attribute, leaves room for more types */ #define TEE_IOCTL_PARAM_ATTR_TYPE_MASK 0xff /* Meta parameter carrying extra information about the message. */ #define TEE_IOCTL_PARAM_ATTR_META 0x100 /* Mask of all known attr bits */ #define TEE_IOCTL_PARAM_ATTR_MASK \ (TEE_IOCTL_PARAM_ATTR_TYPE_MASK | TEE_IOCTL_PARAM_ATTR_META) /* * Matches TEEC_LOGIN_* in GP TEE Client API * Are only defined for GP compliant TEEs */ #define TEE_IOCTL_LOGIN_PUBLIC 0 #define TEE_IOCTL_LOGIN_USER 1 #define TEE_IOCTL_LOGIN_GROUP 2 #define TEE_IOCTL_LOGIN_APPLICATION 4 #define TEE_IOCTL_LOGIN_USER_APPLICATION 5 #define TEE_IOCTL_LOGIN_GROUP_APPLICATION 6 /** * struct tee_ioctl_param - parameter * @attr: attributes * @a: if a memref, offset into the shared memory object, else a value parameter * @b: if a memref, size of the buffer, else a value parameter * @c: if a memref, shared memory identifier, else a value parameter * * @attr & TEE_PARAM_ATTR_TYPE_MASK indicates if memref or value is used in * the union. TEE_PARAM_ATTR_TYPE_VALUE_* indicates value and * TEE_PARAM_ATTR_TYPE_MEMREF_* indicates memref. TEE_PARAM_ATTR_TYPE_NONE * indicates that none of the members are used. * * Shared memory is allocated with TEE_IOC_SHM_ALLOC which returns an * identifier representing the shared memory object. A memref can reference * a part of a shared memory by specifying an offset (@a) and size (@b) of * the object. To supply the entire shared memory object set the offset * (@a) to 0 and size (@b) to the previously returned size of the object. * * A client may need to present a NULL pointer in the argument * passed to a trusted application in the TEE. * This is also a requirement in GlobalPlatform Client API v1.0c * (section 3.2.5 memory references), which can be found at * http://www.globalplatform.org/specificationsdevice.asp * * If a NULL pointer is passed to a TA in the TEE, the (@c) * IOCTL parameters value must be set to TEE_MEMREF_NULL indicating a NULL * memory reference. */ struct tee_ioctl_param { __u64 attr; __u64 a; __u64 b; __u64 c; }; #define TEE_IOCTL_UUID_LEN 16 /** * struct tee_ioctl_open_session_arg - Open session argument * @uuid: [in] UUID of the Trusted Application * @clnt_uuid: [in] UUID of client * @clnt_login: [in] Login class of client, TEE_IOCTL_LOGIN_* above * @cancel_id: [in] Cancellation id, a unique value to identify this request * @session: [out] Session id * @ret: [out] return value * @ret_origin [out] origin of the return value * @num_params [in] number of parameters following this struct */ struct tee_ioctl_open_session_arg { __u8 uuid[TEE_IOCTL_UUID_LEN]; __u8 clnt_uuid[TEE_IOCTL_UUID_LEN]; __u32 clnt_login; __u32 cancel_id; __u32 session; __u32 ret; __u32 ret_origin; __u32 num_params; /* num_params tells the actual number of element in params */ struct tee_ioctl_param params[]; }; /** * TEE_IOC_OPEN_SESSION - opens a session to a Trusted Application * * Takes a struct tee_ioctl_buf_data which contains a struct * tee_ioctl_open_session_arg followed by any array of struct * tee_ioctl_param */ #define TEE_IOC_OPEN_SESSION _IOR(TEE_IOC_MAGIC, TEE_IOC_BASE + 2, \ struct tee_ioctl_buf_data) /** * struct tee_ioctl_invoke_func_arg - Invokes a function in a Trusted * Application * @func: [in] Trusted Application function, specific to the TA * @session: [in] Session id * @cancel_id: [in] Cancellation id, a unique value to identify this request * @ret: [out] return value * @ret_origin [out] origin of the return value * @num_params [in] number of parameters following this struct */ struct tee_ioctl_invoke_arg { __u32 func; __u32 session; __u32 cancel_id; __u32 ret; __u32 ret_origin; __u32 num_params; /* num_params tells the actual number of element in params */ struct tee_ioctl_param params[]; }; /** * TEE_IOC_INVOKE - Invokes a function in a Trusted Application * * Takes a struct tee_ioctl_buf_data which contains a struct * tee_invoke_func_arg followed by any array of struct tee_param */ #define TEE_IOC_INVOKE _IOR(TEE_IOC_MAGIC, TEE_IOC_BASE + 3, \ struct tee_ioctl_buf_data) /** * struct tee_ioctl_cancel_arg - Cancels an open session or invoke ioctl * @cancel_id: [in] Cancellation id, a unique value to identify this request * @session: [in] Session id, if the session is opened, else set to 0 */ struct tee_ioctl_cancel_arg { __u32 cancel_id; __u32 session; }; /** * TEE_IOC_CANCEL - Cancels an open session or invoke */ #define TEE_IOC_CANCEL _IOR(TEE_IOC_MAGIC, TEE_IOC_BASE + 4, \ struct tee_ioctl_cancel_arg) /** * struct tee_ioctl_close_session_arg - Closes an open session * @session: [in] Session id */ struct tee_ioctl_close_session_arg { __u32 session; }; /** * TEE_IOC_CLOSE_SESSION - Closes a session */ #define TEE_IOC_CLOSE_SESSION _IOR(TEE_IOC_MAGIC, TEE_IOC_BASE + 5, \ struct tee_ioctl_close_session_arg) /** * struct tee_iocl_supp_recv_arg - Receive a request for a supplicant function * @func: [in] supplicant function * @num_params [in/out] number of parameters following this struct * * @num_params is the number of params that tee-supplicant has room to * receive when input, @num_params is the number of actual params * tee-supplicant receives when output. */ struct tee_iocl_supp_recv_arg { __u32 func; __u32 num_params; /* num_params tells the actual number of element in params */ struct tee_ioctl_param params[]; }; /** * TEE_IOC_SUPPL_RECV - Receive a request for a supplicant function * * Takes a struct tee_ioctl_buf_data which contains a struct * tee_iocl_supp_recv_arg followed by any array of struct tee_param */ #define TEE_IOC_SUPPL_RECV _IOR(TEE_IOC_MAGIC, TEE_IOC_BASE + 6, \ struct tee_ioctl_buf_data) /** * struct tee_iocl_supp_send_arg - Send a response to a received request * @ret: [out] return value * @num_params [in] number of parameters following this struct */ struct tee_iocl_supp_send_arg { __u32 ret; __u32 num_params; /* num_params tells the actual number of element in params */ struct tee_ioctl_param params[]; }; /** * TEE_IOC_SUPPL_SEND - Receive a request for a supplicant function * * Takes a struct tee_ioctl_buf_data which contains a struct * tee_iocl_supp_send_arg followed by any array of struct tee_param */ #define TEE_IOC_SUPPL_SEND _IOR(TEE_IOC_MAGIC, TEE_IOC_BASE + 7, \ struct tee_ioctl_buf_data) /** * struct tee_ioctl_shm_register_data - Shared memory register argument * @addr: [in] Start address of shared memory to register * @length: [in/out] Length of shared memory to register * @flags: [in/out] Flags to/from registration. * @id: [out] Identifier of the shared memory * * The flags field should currently be zero as input. Updated by the call * with actual flags as defined by TEE_IOCTL_SHM_* above. * This structure is used as argument for TEE_IOC_SHM_REGISTER below. */ struct tee_ioctl_shm_register_data { __u64 addr; __u64 length; __u32 flags; __s32 id; }; /** * TEE_IOC_SHM_REGISTER - Register shared memory argument * * Registers shared memory between the user space process and secure OS. * * Returns a file descriptor on success or < 0 on failure * * The shared memory is unregisterred when the descriptor is closed. */ #define TEE_IOC_SHM_REGISTER _IOWR(TEE_IOC_MAGIC, TEE_IOC_BASE + 9, \ struct tee_ioctl_shm_register_data) /* * Five syscalls are used when communicating with the TEE driver. * open(): opens the device associated with the driver * ioctl(): as described above operating on the file descriptor from open() * close(): two cases * - closes the device file descriptor * - closes a file descriptor connected to allocated shared memory * mmap(): maps shared memory into user space using information from struct * tee_ioctl_shm_alloc_data * munmap(): unmaps previously shared memory */ #endif /*__TEE_H*/