/**************************************************************************** * drivers/misc/optee_msg.h * * SPDX-License-Identifier: BSD-2-Clause * Copyright (c) 2015-2020, Linaro Limited * ****************************************************************************/ #ifndef __DRIVERS_MISC_OPTEE_MSG_H #define __DRIVERS_MISC_OPTEE_MSG_H /**************************************************************************** * Included Files ****************************************************************************/ #include #include /** * This file defines the OP-TEE message protocol (ABI) used to communicate * with an instance of OP-TEE running in secure world. * * This file is divided into two sections. * 1. Formatting of messages. * 2. Requests from normal world */ /**************************************************************************** * 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_FMEM_INPUT OPTEE_MSG_ATTR_TYPE_RMEM_INPUT #define OPTEE_MSG_ATTR_TYPE_FMEM_OUTPUT OPTEE_MSG_ATTR_TYPE_RMEM_OUTPUT #define OPTEE_MSG_ATTR_TYPE_FMEM_INOUT OPTEE_MSG_ATTR_TYPE_RMEM_INOUT #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) /** * Pointer to a list of pages used to register user-defined SHM buffer. * Used with OPTEE_MSG_ATTR_TYPE_TMEM_*. * buf_ptr should point to the beginning of the buffer. Buffer will contain * list of page addresses. OP-TEE core can reconstruct contiguous buffer from * that page addresses list. Page addresses are stored as 64 bit values. * Last entry on a page should point to the next page of buffer. * Every entry in buffer should point to a 4k page beginning (12 least * significant bits must be equal to zero). * * 12 least significant bits of optee_msg_param.u.tmem.buf_ptr should hold * page offset of user buffer. * * So, entries should be placed like members of this structure: * * struct page_data { * uint64_t pages_array[ * OPTEE_MSG_NONCONTIG_PAGE_SIZE/sizeof(uint64_t) - 1]; * uint64_t next_page_data; * }; * * Structure is designed to exactly fit into the page size * OPTEE_MSG_NONCONTIG_PAGE_SIZE which is a standard 4KB page. * * The size of 4KB is chosen because this is the smallest page size for ARM * architectures. If REE uses larger pages, it should divide them to 4KB * ones. */ #define OPTEE_MSG_ATTR_NONCONTIG 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 /** * Page size used in non-contiguous buffer entries */ #define OPTEE_MSG_NONCONTIG_PAGE_SIZE 4096 #define OPTEE_MSG_FMEM_INVALID_GLOBAL_ID 0xffffffffffffffff /** * 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 { uint64_t buf_ptr; uint64_t size; uint64_t 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 { uint64_t offs; uint64_t size; uint64_t shm_ref; }; /** * struct optee_msg_param_fmem - ffa memory reference parameter * @offs_lower: Lower bits of offset into shared memory reference * @offs_upper: Upper bits of offset into shared memory reference * @internal_offs: Internal offset into the first page of shared memory * reference * @size: Size of the buffer * @global_id: Global identifier of Shared memory */ struct optee_msg_param_fmem { uint32_t offs_low; uint16_t offs_high; uint16_t internal_offs; uint64_t size; uint64_t global_id; }; /** * struct optee_msg_param_value - opaque value parameter * * Value parameters are passed unchecked between normal and secure world. */ struct optee_msg_param_value { uint64_t a; uint64_t b; uint64_t 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 * @fmem: parameter by ffa registered memory reference * @value: parameter by opaque value * @octets: parameter by octet string * * @attr & OPTEE_MSG_ATTR_TYPE_MASK indicates if tmem, rmem or value is used * in the union. OPTEE_MSG_ATTR_TYPE_VALUE_* indicates value or octets, * OPTEE_MSG_ATTR_TYPE_TMEM_* indicates @tmem and * OPTEE_MSG_ATTR_TYPE_RMEM_* or the alias PTEE_MSG_ATTR_TYPE_FMEM_* * indicates @rmem or @fmem depending on the conduit. * OPTEE_MSG_ATTR_TYPE_NONE indicates that none of the members are used. */ struct optee_msg_param { uint64_t attr; union { struct optee_msg_param_tmem tmem; struct optee_msg_param_rmem rmem; struct optee_msg_param_fmem fmem; struct optee_msg_param_value value; uint8_t octets[24]; } 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 fields hold 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 have to come first. */ struct optee_msg_arg { uint32_t cmd; uint32_t func; uint32_t session; uint32_t cancel_id; uint32_t pad; uint32_t ret; uint32_t ret_origin; uint32_t num_params; /* num_params tells the actual number of element in params */ struct optee_msg_param params[]; }; /** * 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_NONCONTIG] * [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 * * OPTEE_MSG_CMD_UNREGISTER_SHM unregisters 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 * * OPTEE_MSG_CMD_DO_BOTTOM_HALF does the scheduled bottom half processing * of a driver. * * OPTEE_MSG_CMD_STOP_ASYNC_NOTIF informs secure world that from now is * normal world unable to process asynchronous notifications. Typically * used when the driver is shut down. */ #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_CMD_DO_BOTTOM_HALF 6 #define OPTEE_MSG_CMD_STOP_ASYNC_NOTIF 7 #define OPTEE_MSG_FUNCID_CALL_WITH_ARG 0x0004 #endif /* __DRIVERS_MISC_OPTEE_MSG_H */