306 lines
10 KiB
C
306 lines
10 KiB
C
/* SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) */
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/*
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* Copyright (c) 2015-2021, Linaro Limited
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*/
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#ifndef _OPTEE_MSG_H
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#define _OPTEE_MSG_H
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#include <linux/bitops.h>
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#include <linux/types.h>
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/*
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* This file defines the OP-TEE message protocol (ABI) used to communicate
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* with an instance of OP-TEE running in secure world.
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*
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* This file is divided into two sections.
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* 1. Formatting of messages.
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* 2. Requests from normal world
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*/
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/*****************************************************************************
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* Part 1 - formatting of messages
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*****************************************************************************/
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#define OPTEE_MSG_ATTR_TYPE_NONE 0x0
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#define OPTEE_MSG_ATTR_TYPE_VALUE_INPUT 0x1
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#define OPTEE_MSG_ATTR_TYPE_VALUE_OUTPUT 0x2
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#define OPTEE_MSG_ATTR_TYPE_VALUE_INOUT 0x3
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#define OPTEE_MSG_ATTR_TYPE_RMEM_INPUT 0x5
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#define OPTEE_MSG_ATTR_TYPE_RMEM_OUTPUT 0x6
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#define OPTEE_MSG_ATTR_TYPE_RMEM_INOUT 0x7
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#define OPTEE_MSG_ATTR_TYPE_TMEM_INPUT 0x9
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#define OPTEE_MSG_ATTR_TYPE_TMEM_OUTPUT 0xa
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#define OPTEE_MSG_ATTR_TYPE_TMEM_INOUT 0xb
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#define OPTEE_MSG_ATTR_TYPE_MASK GENMASK(7, 0)
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/*
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* Meta parameter to be absorbed by the Secure OS and not passed
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* to the Trusted Application.
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*
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* Currently only used with OPTEE_MSG_CMD_OPEN_SESSION.
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*/
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#define OPTEE_MSG_ATTR_META BIT(8)
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/*
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* Pointer to a list of pages used to register user-defined SHM buffer.
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* Used with OPTEE_MSG_ATTR_TYPE_TMEM_*.
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* buf_ptr should point to the beginning of the buffer. Buffer will contain
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* list of page addresses. OP-TEE core can reconstruct contiguous buffer from
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* that page addresses list. Page addresses are stored as 64 bit values.
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* Last entry on a page should point to the next page of buffer.
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* Every entry in buffer should point to a 4k page beginning (12 least
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* significant bits must be equal to zero).
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*
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* 12 least significant bits of optee_msg_param.u.tmem.buf_ptr should hold
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* page offset of user buffer.
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*
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* So, entries should be placed like members of this structure:
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*
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* struct page_data {
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* uint64_t pages_array[OPTEE_MSG_NONCONTIG_PAGE_SIZE/sizeof(uint64_t) - 1];
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* uint64_t next_page_data;
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* };
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*
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* Structure is designed to exactly fit into the page size
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* OPTEE_MSG_NONCONTIG_PAGE_SIZE which is a standard 4KB page.
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*
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* The size of 4KB is chosen because this is the smallest page size for ARM
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* architectures. If REE uses larger pages, it should divide them to 4KB ones.
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*/
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#define OPTEE_MSG_ATTR_NONCONTIG BIT(9)
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/*
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* Memory attributes for caching passed with temp memrefs. The actual value
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* used is defined outside the message protocol with the exception of
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* OPTEE_MSG_ATTR_CACHE_PREDEFINED which means the attributes already
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* defined for the memory range should be used. If optee_smc.h is used as
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* bearer of this protocol OPTEE_SMC_SHM_* is used for values.
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*/
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#define OPTEE_MSG_ATTR_CACHE_SHIFT 16
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#define OPTEE_MSG_ATTR_CACHE_MASK GENMASK(2, 0)
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#define OPTEE_MSG_ATTR_CACHE_PREDEFINED 0
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/*
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* Same values as TEE_LOGIN_* from TEE Internal API
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*/
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#define OPTEE_MSG_LOGIN_PUBLIC 0x00000000
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#define OPTEE_MSG_LOGIN_USER 0x00000001
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#define OPTEE_MSG_LOGIN_GROUP 0x00000002
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#define OPTEE_MSG_LOGIN_APPLICATION 0x00000004
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#define OPTEE_MSG_LOGIN_APPLICATION_USER 0x00000005
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#define OPTEE_MSG_LOGIN_APPLICATION_GROUP 0x00000006
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/*
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* Page size used in non-contiguous buffer entries
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*/
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#define OPTEE_MSG_NONCONTIG_PAGE_SIZE 4096
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/**
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* struct optee_msg_param_tmem - temporary memory reference parameter
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* @buf_ptr: Address of the buffer
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* @size: Size of the buffer
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* @shm_ref: Temporary shared memory reference, pointer to a struct tee_shm
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*
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* Secure and normal world communicates pointers as physical address
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* instead of the virtual address. This is because secure and normal world
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* have completely independent memory mapping. Normal world can even have a
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* hypervisor which need to translate the guest physical address (AKA IPA
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* in ARM documentation) to a real physical address before passing the
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* structure to secure world.
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*/
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struct optee_msg_param_tmem {
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u64 buf_ptr;
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u64 size;
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u64 shm_ref;
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};
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/**
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* struct optee_msg_param_rmem - registered memory reference parameter
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* @offs: Offset into shared memory reference
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* @size: Size of the buffer
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* @shm_ref: Shared memory reference, pointer to a struct tee_shm
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*/
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struct optee_msg_param_rmem {
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u64 offs;
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u64 size;
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u64 shm_ref;
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};
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/**
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* struct optee_msg_param_value - opaque value parameter
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*
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* Value parameters are passed unchecked between normal and secure world.
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*/
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struct optee_msg_param_value {
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u64 a;
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u64 b;
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u64 c;
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};
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/**
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* struct optee_msg_param - parameter used together with struct optee_msg_arg
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* @attr: attributes
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* @tmem: parameter by temporary memory reference
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* @rmem: parameter by registered memory reference
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* @value: parameter by opaque value
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* @octets: parameter by octet string
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*
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* @attr & OPTEE_MSG_ATTR_TYPE_MASK indicates if tmem, rmem or value is used in
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* the union. OPTEE_MSG_ATTR_TYPE_VALUE_* indicates value or octets,
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* OPTEE_MSG_ATTR_TYPE_TMEM_* indicates @tmem and
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* OPTEE_MSG_ATTR_TYPE_RMEM_* indicates @rmem,
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* OPTEE_MSG_ATTR_TYPE_NONE indicates that none of the members are used.
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*/
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struct optee_msg_param {
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u64 attr;
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union {
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struct optee_msg_param_tmem tmem;
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struct optee_msg_param_rmem rmem;
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struct optee_msg_param_value value;
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u8 octets[24];
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} u;
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};
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/**
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* struct optee_msg_arg - call argument
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* @cmd: Command, one of OPTEE_MSG_CMD_* or OPTEE_MSG_RPC_CMD_*
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* @func: Trusted Application function, specific to the Trusted Application,
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* used if cmd == OPTEE_MSG_CMD_INVOKE_COMMAND
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* @session: In parameter for all OPTEE_MSG_CMD_* except
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* OPTEE_MSG_CMD_OPEN_SESSION where it's an output parameter instead
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* @cancel_id: Cancellation id, a unique value to identify this request
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* @ret: return value
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* @ret_origin: origin of the return value
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* @num_params: number of parameters supplied to the OS Command
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* @params: the parameters supplied to the OS Command
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*
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* All normal calls to Trusted OS uses this struct. If cmd requires further
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* information than what these fields hold it can be passed as a parameter
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* tagged as meta (setting the OPTEE_MSG_ATTR_META bit in corresponding
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* attrs field). All parameters tagged as meta have to come first.
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*/
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struct optee_msg_arg {
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u32 cmd;
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u32 func;
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u32 session;
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u32 cancel_id;
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u32 pad;
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u32 ret;
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u32 ret_origin;
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u32 num_params;
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/* num_params tells the actual number of element in params */
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struct optee_msg_param params[];
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};
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/**
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* OPTEE_MSG_GET_ARG_SIZE - return size of struct optee_msg_arg
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*
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* @num_params: Number of parameters embedded in the struct optee_msg_arg
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*
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* Returns the size of the struct optee_msg_arg together with the number
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* of embedded parameters.
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*/
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#define OPTEE_MSG_GET_ARG_SIZE(num_params) \
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(sizeof(struct optee_msg_arg) + \
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sizeof(struct optee_msg_param) * (num_params))
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/*****************************************************************************
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* Part 2 - requests from normal world
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*****************************************************************************/
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/*
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* Return the following UID if using API specified in this file without
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* further extensions:
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* 384fb3e0-e7f8-11e3-af63-0002a5d5c51b.
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* Represented in 4 32-bit words in OPTEE_MSG_UID_0, OPTEE_MSG_UID_1,
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* OPTEE_MSG_UID_2, OPTEE_MSG_UID_3.
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*/
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#define OPTEE_MSG_UID_0 0x384fb3e0
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#define OPTEE_MSG_UID_1 0xe7f811e3
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#define OPTEE_MSG_UID_2 0xaf630002
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#define OPTEE_MSG_UID_3 0xa5d5c51b
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#define OPTEE_MSG_FUNCID_CALLS_UID 0xFF01
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/*
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* Returns 2.0 if using API specified in this file without further
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* extensions. Represented in 2 32-bit words in OPTEE_MSG_REVISION_MAJOR
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* and OPTEE_MSG_REVISION_MINOR
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*/
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#define OPTEE_MSG_REVISION_MAJOR 2
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#define OPTEE_MSG_REVISION_MINOR 0
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#define OPTEE_MSG_FUNCID_CALLS_REVISION 0xFF03
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/*
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* Get UUID of Trusted OS.
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*
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* Used by non-secure world to figure out which Trusted OS is installed.
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* Note that returned UUID is the UUID of the Trusted OS, not of the API.
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*
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* Returns UUID in 4 32-bit words in the same way as
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* OPTEE_MSG_FUNCID_CALLS_UID described above.
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*/
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#define OPTEE_MSG_OS_OPTEE_UUID_0 0x486178e0
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#define OPTEE_MSG_OS_OPTEE_UUID_1 0xe7f811e3
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#define OPTEE_MSG_OS_OPTEE_UUID_2 0xbc5e0002
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#define OPTEE_MSG_OS_OPTEE_UUID_3 0xa5d5c51b
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#define OPTEE_MSG_FUNCID_GET_OS_UUID 0x0000
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/*
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* Get revision of Trusted OS.
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*
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* Used by non-secure world to figure out which version of the Trusted OS
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* is installed. Note that the returned revision is the revision of the
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* Trusted OS, not of the API.
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*
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* Returns revision in 2 32-bit words in the same way as
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* OPTEE_MSG_CALLS_REVISION described above.
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*/
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#define OPTEE_MSG_FUNCID_GET_OS_REVISION 0x0001
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/*
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* Do a secure call with struct optee_msg_arg as argument
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* The OPTEE_MSG_CMD_* below defines what goes in struct optee_msg_arg::cmd
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*
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* OPTEE_MSG_CMD_OPEN_SESSION opens a session to a Trusted Application.
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* The first two parameters are tagged as meta, holding two value
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* parameters to pass the following information:
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* param[0].u.value.a-b uuid of Trusted Application
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* param[1].u.value.a-b uuid of Client
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* param[1].u.value.c Login class of client OPTEE_MSG_LOGIN_*
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*
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* OPTEE_MSG_CMD_INVOKE_COMMAND invokes a command a previously opened
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* session to a Trusted Application. struct optee_msg_arg::func is Trusted
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* Application function, specific to the Trusted Application.
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*
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* OPTEE_MSG_CMD_CLOSE_SESSION closes a previously opened session to
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* Trusted Application.
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*
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* OPTEE_MSG_CMD_CANCEL cancels a currently invoked command.
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*
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* OPTEE_MSG_CMD_REGISTER_SHM registers a shared memory reference. The
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* information is passed as:
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* [in] param[0].attr OPTEE_MSG_ATTR_TYPE_TMEM_INPUT
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* [| OPTEE_MSG_ATTR_NONCONTIG]
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* [in] param[0].u.tmem.buf_ptr physical address (of first fragment)
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* [in] param[0].u.tmem.size size (of first fragment)
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* [in] param[0].u.tmem.shm_ref holds shared memory reference
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*
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* OPTEE_MSG_CMD_UNREGISTER_SHM unregisters a previously registered shared
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* memory reference. The information is passed as:
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* [in] param[0].attr OPTEE_MSG_ATTR_TYPE_RMEM_INPUT
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* [in] param[0].u.rmem.shm_ref holds shared memory reference
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* [in] param[0].u.rmem.offs 0
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* [in] param[0].u.rmem.size 0
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*/
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#define OPTEE_MSG_CMD_OPEN_SESSION 0
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#define OPTEE_MSG_CMD_INVOKE_COMMAND 1
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#define OPTEE_MSG_CMD_CLOSE_SESSION 2
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#define OPTEE_MSG_CMD_CANCEL 3
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#define OPTEE_MSG_CMD_REGISTER_SHM 4
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#define OPTEE_MSG_CMD_UNREGISTER_SHM 5
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#define OPTEE_MSG_FUNCID_CALL_WITH_ARG 0x0004
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#endif /* _OPTEE_MSG_H */
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