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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) */
/*
* 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
/*
* 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.
*/
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)
/*
* 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*/
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