diff --git a/xen/arch/arm/tee/optee_msg.h b/xen/arch/arm/tee/optee_msg.h
new file mode 100644
index 0000000..10747b2
--- /dev/null
+++ b/xen/arch/arm/tee/optee_msg.h
@@ -0,0 +1,444 @@
+/*
+ * 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 _OPTEE_MSG_H
+#define _OPTEE_MSG_H
+
+#include <xen/bitops.h>
+#include <xen/types.h>
+
+/*
+ * This file defines the OP-TEE message protocol used to communicate
+ * with an instance of OP-TEE running in secure world.
+ *
+ * This file is divided into three sections.
+ * 1. Formatting of messages.
+ * 2. Requests from normal world
+ * 3. Requests from secure world, Remote Procedure Call (RPC), handled by
+ *    tee-supplicant.
+ */
+
+/*****************************************************************************
+ * 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_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 bints of optee_msg_param.u.tmem.buf_ptr should hold page
+ * offset of the 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
+
+/**
+ * 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 {
+	u64 buf_ptr;
+	u64 size;
+	u64 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 {
+	u64 offs;
+	u64 size;
+	u64 shm_ref;
+};
+
+/**
+ * struct optee_msg_param_value - opaque value parameter
+ *
+ * Value parameters are passed unchecked between normal and secure world.
+ */
+struct optee_msg_param_value {
+	u64 a;
+	u64 b;
+	u64 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
+ * @value:	parameter by opaque value
+ *
+ * @attr & OPTEE_MSG_ATTR_TYPE_MASK indicates if tmem, rmem or value is used in
+ * the union. OPTEE_MSG_ATTR_TYPE_VALUE_* indicates value,
+ * OPTEE_MSG_ATTR_TYPE_TMEM_* indicates @tmem and
+ * OPTEE_MSG_ATTR_TYPE_RMEM_* indicates @rmem,
+ * OPTEE_MSG_ATTR_TYPE_NONE indicates that none of the members are used.
+ */
+struct optee_msg_param {
+	u64 attr;
+	union {
+		struct optee_msg_param_tmem tmem;
+		struct optee_msg_param_rmem rmem;
+		struct optee_msg_param_value value;
+	} 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 field holds 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 has to come first.
+ *
+ * Temp memref parameters can be fragmented if supported by the Trusted OS
+ * (when optee_smc.h is bearer of this protocol this is indicated with
+ * OPTEE_SMC_SEC_CAP_UNREGISTERED_SHM). If a logical memref parameter is
+ * fragmented then has all but the last fragment the
+ * OPTEE_MSG_ATTR_FRAGMENT bit set in attrs. Even if a memref is fragmented
+ * it will still be presented as a single logical memref to the Trusted
+ * Application.
+ */
+struct optee_msg_arg {
+	u32 cmd;
+	u32 func;
+	u32 session;
+	u32 cancel_id;
+	u32 pad;
+	u32 ret;
+	u32 ret_origin;
+	u32 num_params;
+
+	/* num_params tells the actual number of element in params */
+	struct optee_msg_param params[0];
+};
+
+/**
+ * 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_FRAGMENT]
+ * [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
+ * ...
+ * The shared memory can optionally be fragmented, temp memrefs can follow
+ * each other with all but the last with the OPTEE_MSG_ATTR_FRAGMENT bit set.
+ *
+ * OPTEE_MSG_CMD_UNREGISTER_SHM unregisteres 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
+ */
+#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_FUNCID_CALL_WITH_ARG	0x0004
+
+/*****************************************************************************
+ * Part 3 - Requests from secure world, RPC
+ *****************************************************************************/
+
+/*
+ * All RPC is done with a struct optee_msg_arg as bearer of information,
+ * struct optee_msg_arg::arg holds values defined by OPTEE_MSG_RPC_CMD_* below
+ *
+ * RPC communication with tee-supplicant is reversed compared to normal
+ * client communication desribed above. The supplicant receives requests
+ * and sends responses.
+ */
+
+/*
+ * Load a TA into memory, defined in tee-supplicant
+ */
+#define OPTEE_MSG_RPC_CMD_LOAD_TA	0
+
+/*
+ * Reserved
+ */
+#define OPTEE_MSG_RPC_CMD_RPMB		1
+
+/*
+ * File system access, defined in tee-supplicant
+ */
+#define OPTEE_MSG_RPC_CMD_FS		2
+
+/*
+ * Get time
+ *
+ * Returns number of seconds and nano seconds since the Epoch,
+ * 1970-01-01 00:00:00 +0000 (UTC).
+ *
+ * [out] param[0].u.value.a	Number of seconds
+ * [out] param[0].u.value.b	Number of nano seconds.
+ */
+#define OPTEE_MSG_RPC_CMD_GET_TIME	3
+
+/*
+ * Wait queue primitive, helper for secure world to implement a wait queue.
+ *
+ * If secure world need to wait for a secure world mutex it issues a sleep
+ * request instead of spinning in secure world. Conversely is a wakeup
+ * request issued when a secure world mutex with a thread waiting thread is
+ * unlocked.
+ *
+ * Waiting on a key
+ * [in] param[0].u.value.a OPTEE_MSG_RPC_WAIT_QUEUE_SLEEP
+ * [in] param[0].u.value.b wait key
+ *
+ * Waking up a key
+ * [in] param[0].u.value.a OPTEE_MSG_RPC_WAIT_QUEUE_WAKEUP
+ * [in] param[0].u.value.b wakeup key
+ */
+#define OPTEE_MSG_RPC_CMD_WAIT_QUEUE	4
+#define OPTEE_MSG_RPC_WAIT_QUEUE_SLEEP	0
+#define OPTEE_MSG_RPC_WAIT_QUEUE_WAKEUP	1
+
+/*
+ * Suspend execution
+ *
+ * [in] param[0].value	.a number of milliseconds to suspend
+ */
+#define OPTEE_MSG_RPC_CMD_SUSPEND	5
+
+/*
+ * Allocate a piece of shared memory
+ *
+ * Shared memory can optionally be fragmented, to support that additional
+ * spare param entries are allocated to make room for eventual fragments.
+ * The spare param entries has .attr = OPTEE_MSG_ATTR_TYPE_NONE when
+ * unused. All returned temp memrefs except the last should have the
+ * OPTEE_MSG_ATTR_FRAGMENT bit set in the attr field.
+ *
+ * [in]  param[0].u.value.a		type of memory one of
+ *					OPTEE_MSG_RPC_SHM_TYPE_* below
+ * [in]  param[0].u.value.b		requested size
+ * [in]  param[0].u.value.c		required alignment
+ *
+ * [out] param[0].u.tmem.buf_ptr	physical address (of first fragment)
+ * [out] param[0].u.tmem.size		size (of first fragment)
+ * [out] param[0].u.tmem.shm_ref	shared memory reference
+ * ...
+ * [out] param[n].u.tmem.buf_ptr	physical address
+ * [out] param[n].u.tmem.size		size
+ * [out] param[n].u.tmem.shm_ref	shared memory reference (same value
+ *					as in param[n-1].u.tmem.shm_ref)
+ */
+#define OPTEE_MSG_RPC_CMD_SHM_ALLOC	6
+/* Memory that can be shared with a non-secure user space application */
+#define OPTEE_MSG_RPC_SHM_TYPE_APPL	0
+/* Memory only shared with non-secure kernel */
+#define OPTEE_MSG_RPC_SHM_TYPE_KERNEL	1
+
+/*
+ * Free shared memory previously allocated with OPTEE_MSG_RPC_CMD_SHM_ALLOC
+ *
+ * [in]  param[0].u.value.a		type of memory one of
+ *					OPTEE_MSG_RPC_SHM_TYPE_* above
+ * [in]  param[0].u.value.b		value of shared memory reference
+ *					returned in param[0].u.tmem.shm_ref
+ *					above
+ */
+#define OPTEE_MSG_RPC_CMD_SHM_FREE	7
+
+#endif /* _OPTEE_MSG_H */
diff --git a/xen/arch/arm/tee/optee_smc.h b/xen/arch/arm/tee/optee_smc.h
new file mode 100644
index 0000000..92f4d54
--- /dev/null
+++ b/xen/arch/arm/tee/optee_smc.h
@@ -0,0 +1,457 @@
+/*
+ * 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 OPTEE_SMC_H
+#define OPTEE_SMC_H
+
+#include <asm/smccc.h>
+#include <xen/bitops.h>
+
+#define OPTEE_SMC_STD_CALL_VAL(func_num) \
+	ARM_SMCCC_CALL_VAL(ARM_SMCCC_STD_CALL, ARM_SMCCC_CONV_32, \
+			   ARM_SMCCC_OWNER_TRUSTED_OS, (func_num))
+#define OPTEE_SMC_FAST_CALL_VAL(func_num) \
+	ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, ARM_SMCCC_CONV_32, \
+			   ARM_SMCCC_OWNER_TRUSTED_OS, (func_num))
+
+/*
+ * Function specified by SMC Calling convention.
+ */
+#define OPTEE_SMC_FUNCID_CALLS_COUNT	0xFF00
+#define OPTEE_SMC_CALLS_COUNT \
+	ARM_SMCCC_CALL_VAL(OPTEE_SMC_FAST_CALL, SMCCC_SMC_32, \
+			   SMCCC_OWNER_TRUSTED_OS_END, \
+			   OPTEE_SMC_FUNCID_CALLS_COUNT)
+
+/*
+ * Normal cached memory (write-back), shareable for SMP systems and not
+ * shareable for UP systems.
+ */
+#define OPTEE_SMC_SHM_CACHED		1
+
+/*
+ * a0..a7 is used as register names in the descriptions below, on arm32
+ * that translates to r0..r7 and on arm64 to w0..w7. In both cases it's
+ * 32-bit registers.
+ */
+
+/*
+ * Function specified by SMC Calling convention
+ *
+ * Return one of the following UIDs if using API specified in this file
+ * without further extentions:
+ * 65cb6b93-af0c-4617-8ed6-644a8d1140f8
+ * see also OPTEE_SMC_UID_* in optee_msg.h
+ */
+#define OPTEE_SMC_FUNCID_CALLS_UID OPTEE_MSG_FUNCID_CALLS_UID
+#define OPTEE_SMC_CALLS_UID \
+	ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, ARM_SMCCC_CONV_32, \
+			   ARM_SMCCC_OWNER_TRUSTED_OS_END, \
+			   OPTEE_SMC_FUNCID_CALLS_UID)
+
+/*
+ * Function specified by SMC Calling convention
+ *
+ * Returns 2.0 if using API specified in this file without further extentions.
+ * see also OPTEE_MSG_REVISION_* in optee_msg.h
+ */
+#define OPTEE_SMC_FUNCID_CALLS_REVISION OPTEE_MSG_FUNCID_CALLS_REVISION
+#define OPTEE_SMC_CALLS_REVISION \
+	ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, ARM_SMCCC_CONV_32, \
+			   ARM_SMCCC_OWNER_TRUSTED_OS_END, \
+			   OPTEE_SMC_FUNCID_CALLS_REVISION)
+
+struct optee_smc_calls_revision_result {
+	unsigned long major;
+	unsigned long minor;
+	unsigned long reserved0;
+	unsigned long reserved1;
+};
+
+/*
+ * 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 a0-4 in the same way as OPTEE_SMC_CALLS_UID
+ * described above.
+ */
+#define OPTEE_SMC_FUNCID_GET_OS_UUID OPTEE_MSG_FUNCID_GET_OS_UUID
+#define OPTEE_SMC_CALL_GET_OS_UUID \
+	OPTEE_SMC_FAST_CALL_VAL(OPTEE_SMC_FUNCID_GET_OS_UUID)
+
+/*
+ * 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 a0-1 in the same way as OPTEE_SMC_CALLS_REVISION
+ * described above.
+ */
+#define OPTEE_SMC_FUNCID_GET_OS_REVISION OPTEE_MSG_FUNCID_GET_OS_REVISION
+#define OPTEE_SMC_CALL_GET_OS_REVISION \
+	OPTEE_SMC_FAST_CALL_VAL(OPTEE_SMC_FUNCID_GET_OS_REVISION)
+
+/*
+ * Call with struct optee_msg_arg as argument
+ *
+ * Call register usage:
+ * a0	SMC Function ID, OPTEE_SMC*CALL_WITH_ARG
+ * a1	Upper 32bit of a 64bit physical pointer to a struct optee_msg_arg
+ * a2	Lower 32bit of a 64bit physical pointer to a struct optee_msg_arg
+ * a3	Cache settings, not used if physical pointer is in a predefined shared
+ *	memory area else per OPTEE_SMC_SHM_*
+ * a4-6	Not used
+ * a7	Hypervisor Client ID register
+ *
+ * Normal return register usage:
+ * a0	Return value, OPTEE_SMC_RETURN_*
+ * a1-3	Not used
+ * a4-7	Preserved
+ *
+ * OPTEE_SMC_RETURN_ETHREAD_LIMIT return register usage:
+ * a0	Return value, OPTEE_SMC_RETURN_ETHREAD_LIMIT
+ * a1-3	Preserved
+ * a4-7	Preserved
+ *
+ * RPC return register usage:
+ * a0	Return value, OPTEE_SMC_RETURN_IS_RPC(val)
+ * a1-2	RPC parameters
+ * a3-7	Resume information, must be preserved
+ *
+ * Possible return values:
+ * OPTEE_SMC_RETURN_UNKNOWN_FUNCTION	Trusted OS does not recognize this
+ *					function.
+ * OPTEE_SMC_RETURN_OK			Call completed, result updated in
+ *					the previously supplied struct
+ *					optee_msg_arg.
+ * OPTEE_SMC_RETURN_ETHREAD_LIMIT	Number of Trusted OS threads exceeded,
+ *					try again later.
+ * OPTEE_SMC_RETURN_EBADADDR		Bad physcial pointer to struct
+ *					optee_msg_arg.
+ * OPTEE_SMC_RETURN_EBADCMD		Bad/unknown cmd in struct optee_msg_arg
+ * OPTEE_SMC_RETURN_IS_RPC()		Call suspended by RPC call to normal
+ *					world.
+ */
+#define OPTEE_SMC_FUNCID_CALL_WITH_ARG OPTEE_MSG_FUNCID_CALL_WITH_ARG
+#define OPTEE_SMC_CALL_WITH_ARG \
+	OPTEE_SMC_STD_CALL_VAL(OPTEE_SMC_FUNCID_CALL_WITH_ARG)
+
+/*
+ * Get Shared Memory Config
+ *
+ * Returns the Secure/Non-secure shared memory config.
+ *
+ * Call register usage:
+ * a0	SMC Function ID, OPTEE_SMC_GET_SHM_CONFIG
+ * a1-6	Not used
+ * a7	Hypervisor Client ID register
+ *
+ * Have config return register usage:
+ * a0	OPTEE_SMC_RETURN_OK
+ * a1	Physical address of start of SHM
+ * a2	Size of of SHM
+ * a3	Cache settings of memory, as defined by the
+ *	OPTEE_SMC_SHM_* values above
+ * a4-7	Preserved
+ *
+ * Not available register usage:
+ * a0	OPTEE_SMC_RETURN_ENOTAVAIL
+ * a1-3 Not used
+ * a4-7	Preserved
+ */
+#define OPTEE_SMC_FUNCID_GET_SHM_CONFIG	7
+#define OPTEE_SMC_GET_SHM_CONFIG \
+	OPTEE_SMC_FAST_CALL_VAL(OPTEE_SMC_FUNCID_GET_SHM_CONFIG)
+
+struct optee_smc_get_shm_config_result {
+	unsigned long status;
+	unsigned long start;
+	unsigned long size;
+	unsigned long settings;
+};
+
+/*
+ * Exchanges capabilities between normal world and secure world
+ *
+ * Call register usage:
+ * a0	SMC Function ID, OPTEE_SMC_EXCHANGE_CAPABILITIES
+ * a1	bitfield of normal world capabilities OPTEE_SMC_NSEC_CAP_*
+ * a2-6	Not used
+ * a7	Hypervisor Client ID register
+ *
+ * Normal return register usage:
+ * a0	OPTEE_SMC_RETURN_OK
+ * a1	bitfield of secure world capabilities OPTEE_SMC_SEC_CAP_*
+ * a2-7	Preserved
+ *
+ * Error return register usage:
+ * a0	OPTEE_SMC_RETURN_ENOTAVAIL, can't use the capabilities from normal world
+ * a1	bitfield of secure world capabilities OPTEE_SMC_SEC_CAP_*
+ * a2-7 Preserved
+ */
+/* Normal world works as a uniprocessor system */
+#define OPTEE_SMC_NSEC_CAP_UNIPROCESSOR		BIT(0)
+/* Secure world has reserved shared memory for normal world to use */
+#define OPTEE_SMC_SEC_CAP_HAVE_RESERVED_SHM	BIT(0)
+/* Secure world can communicate via previously unregistered shared memory */
+#define OPTEE_SMC_SEC_CAP_UNREGISTERED_SHM	BIT(1)
+
+/*
+ * Secure world supports commands "register/unregister shared memory",
+ * secure world accepts command buffers located in any parts of non-secure RAM
+ */
+#define OPTEE_SMC_SEC_CAP_DYNAMIC_SHM		BIT(2)
+
+#define OPTEE_SMC_FUNCID_EXCHANGE_CAPABILITIES	9
+#define OPTEE_SMC_EXCHANGE_CAPABILITIES \
+	OPTEE_SMC_FAST_CALL_VAL(OPTEE_SMC_FUNCID_EXCHANGE_CAPABILITIES)
+
+struct optee_smc_exchange_capabilities_result {
+	unsigned long status;
+	unsigned long capabilities;
+	unsigned long reserved0;
+	unsigned long reserved1;
+};
+
+/*
+ * Disable and empties cache of shared memory objects
+ *
+ * Secure world can cache frequently used shared memory objects, for
+ * example objects used as RPC arguments. When secure world is idle this
+ * function returns one shared memory reference to free. To disable the
+ * cache and free all cached objects this function has to be called until
+ * it returns OPTEE_SMC_RETURN_ENOTAVAIL.
+ *
+ * Call register usage:
+ * a0	SMC Function ID, OPTEE_SMC_DISABLE_SHM_CACHE
+ * a1-6	Not used
+ * a7	Hypervisor Client ID register
+ *
+ * Normal return register usage:
+ * a0	OPTEE_SMC_RETURN_OK
+ * a1	Upper 32bit of a 64bit Shared memory cookie
+ * a2	Lower 32bit of a 64bit Shared memory cookie
+ * a3-7	Preserved
+ *
+ * Cache empty return register usage:
+ * a0	OPTEE_SMC_RETURN_ENOTAVAIL
+ * a1-7	Preserved
+ *
+ * Not idle return register usage:
+ * a0	OPTEE_SMC_RETURN_EBUSY
+ * a1-7	Preserved
+ */
+#define OPTEE_SMC_FUNCID_DISABLE_SHM_CACHE	10
+#define OPTEE_SMC_DISABLE_SHM_CACHE \
+	OPTEE_SMC_FAST_CALL_VAL(OPTEE_SMC_FUNCID_DISABLE_SHM_CACHE)
+
+struct optee_smc_disable_shm_cache_result {
+	unsigned long status;
+	unsigned long shm_upper32;
+	unsigned long shm_lower32;
+	unsigned long reserved0;
+};
+
+/*
+ * Enable cache of shared memory objects
+ *
+ * Secure world can cache frequently used shared memory objects, for
+ * example objects used as RPC arguments. When secure world is idle this
+ * function returns OPTEE_SMC_RETURN_OK and the cache is enabled. If
+ * secure world isn't idle OPTEE_SMC_RETURN_EBUSY is returned.
+ *
+ * Call register usage:
+ * a0	SMC Function ID, OPTEE_SMC_ENABLE_SHM_CACHE
+ * a1-6	Not used
+ * a7	Hypervisor Client ID register
+ *
+ * Normal return register usage:
+ * a0	OPTEE_SMC_RETURN_OK
+ * a1-7	Preserved
+ *
+ * Not idle return register usage:
+ * a0	OPTEE_SMC_RETURN_EBUSY
+ * a1-7	Preserved
+ */
+#define OPTEE_SMC_FUNCID_ENABLE_SHM_CACHE	11
+#define OPTEE_SMC_ENABLE_SHM_CACHE \
+	OPTEE_SMC_FAST_CALL_VAL(OPTEE_SMC_FUNCID_ENABLE_SHM_CACHE)
+
+/*
+ * Resume from RPC (for example after processing a foreign interrupt)
+ *
+ * Call register usage:
+ * a0	SMC Function ID, OPTEE_SMC_CALL_RETURN_FROM_RPC
+ * a1-3	Value of a1-3 when OPTEE_SMC_CALL_WITH_ARG returned
+ *	OPTEE_SMC_RETURN_RPC in a0
+ *
+ * Return register usage is the same as for OPTEE_SMC_*CALL_WITH_ARG above.
+ *
+ * Possible return values
+ * OPTEE_SMC_RETURN_UNKNOWN_FUNCTION	Trusted OS does not recognize this
+ *					function.
+ * OPTEE_SMC_RETURN_OK			Original call completed, result
+ *					updated in the previously supplied.
+ *					struct optee_msg_arg
+ * OPTEE_SMC_RETURN_RPC			Call suspended by RPC call to normal
+ *					world.
+ * OPTEE_SMC_RETURN_ERESUME		Resume failed, the opaque resume
+ *					information was corrupt.
+ */
+#define OPTEE_SMC_FUNCID_RETURN_FROM_RPC	3
+#define OPTEE_SMC_CALL_RETURN_FROM_RPC \
+	OPTEE_SMC_STD_CALL_VAL(OPTEE_SMC_FUNCID_RETURN_FROM_RPC)
+
+#define OPTEE_SMC_RETURN_RPC_PREFIX_MASK	0xFFFF0000
+#define OPTEE_SMC_RETURN_RPC_PREFIX		0xFFFF0000
+#define OPTEE_SMC_RETURN_RPC_FUNC_MASK		0x0000FFFF
+
+#define OPTEE_SMC_RETURN_GET_RPC_FUNC(ret) \
+	((ret) & OPTEE_SMC_RETURN_RPC_FUNC_MASK)
+
+#define OPTEE_SMC_RPC_VAL(func)		((func) | OPTEE_SMC_RETURN_RPC_PREFIX)
+
+/*
+ * Allocate memory for RPC parameter passing. The memory is used to hold a
+ * struct optee_msg_arg.
+ *
+ * "Call" register usage:
+ * a0	This value, OPTEE_SMC_RETURN_RPC_ALLOC
+ * a1	Size in bytes of required argument memory
+ * a2	Not used
+ * a3	Resume information, must be preserved
+ * a4-5	Not used
+ * a6-7	Resume information, must be preserved
+ *
+ * "Return" register usage:
+ * a0	SMC Function ID, OPTEE_SMC_CALL_RETURN_FROM_RPC.
+ * a1	Upper 32bits of 64bit physical pointer to allocated
+ *	memory, (a1 == 0 && a2 == 0) if size was 0 or if memory can't
+ *	be allocated.
+ * a2	Lower 32bits of 64bit physical pointer to allocated
+ *	memory, (a1 == 0 && a2 == 0) if size was 0 or if memory can't
+ *	be allocated
+ * a3	Preserved
+ * a4	Upper 32bits of 64bit Shared memory cookie used when freeing
+ *	the memory or doing an RPC
+ * a5	Lower 32bits of 64bit Shared memory cookie used when freeing
+ *	the memory or doing an RPC
+ * a6-7	Preserved
+ */
+#define OPTEE_SMC_RPC_FUNC_ALLOC	0
+#define OPTEE_SMC_RETURN_RPC_ALLOC \
+	OPTEE_SMC_RPC_VAL(OPTEE_SMC_RPC_FUNC_ALLOC)
+
+/*
+ * Free memory previously allocated by OPTEE_SMC_RETURN_RPC_ALLOC
+ *
+ * "Call" register usage:
+ * a0	This value, OPTEE_SMC_RETURN_RPC_FREE
+ * a1	Upper 32bits of 64bit shared memory cookie belonging to this
+ *	argument memory
+ * a2	Lower 32bits of 64bit shared memory cookie belonging to this
+ *	argument memory
+ * a3-7	Resume information, must be preserved
+ *
+ * "Return" register usage:
+ * a0	SMC Function ID, OPTEE_SMC_CALL_RETURN_FROM_RPC.
+ * a1-2	Not used
+ * a3-7	Preserved
+ */
+#define OPTEE_SMC_RPC_FUNC_FREE		2
+#define OPTEE_SMC_RETURN_RPC_FREE \
+	OPTEE_SMC_RPC_VAL(OPTEE_SMC_RPC_FUNC_FREE)
+
+/*
+ * Deliver foreign interrupt to normal world.
+ *
+ * "Call" register usage:
+ * a0	OPTEE_SMC_RETURN_RPC_FOREIGN_INTR
+ * a1-7	Resume information, must be preserved
+ *
+ * "Return" register usage:
+ * a0	SMC Function ID, OPTEE_SMC_CALL_RETURN_FROM_RPC.
+ * a1-7	Preserved
+ */
+#define OPTEE_SMC_RPC_FUNC_FOREIGN_INTR		4
+#define OPTEE_SMC_RETURN_RPC_FOREIGN_INTR \
+	OPTEE_SMC_RPC_VAL(OPTEE_SMC_RPC_FUNC_FOREIGN_INTR)
+
+/*
+ * Do an RPC request. The supplied struct optee_msg_arg tells which
+ * request to do and the parameters for the request. The following fields
+ * are used (the rest are unused):
+ * - cmd		the Request ID
+ * - ret		return value of the request, filled in by normal world
+ * - num_params		number of parameters for the request
+ * - params		the parameters
+ * - param_attrs	attributes of the parameters
+ *
+ * "Call" register usage:
+ * a0	OPTEE_SMC_RETURN_RPC_CMD
+ * a1	Upper 32bit of a 64bit Shared memory cookie holding a
+ *	struct optee_msg_arg, must be preserved, only the data should
+ *	be updated
+ * a2	Lower 32bit of a 64bit Shared memory cookie holding a
+ *	struct optee_msg_arg, must be preserved, only the data should
+ *	be updated
+ * a3-7	Resume information, must be preserved
+ *
+ * "Return" register usage:
+ * a0	SMC Function ID, OPTEE_SMC_CALL_RETURN_FROM_RPC.
+ * a1-2	Not used
+ * a3-7	Preserved
+ */
+#define OPTEE_SMC_RPC_FUNC_CMD		5
+#define OPTEE_SMC_RETURN_RPC_CMD \
+	OPTEE_SMC_RPC_VAL(OPTEE_SMC_RPC_FUNC_CMD)
+
+/* Returned in a0 */
+#define OPTEE_SMC_RETURN_UNKNOWN_FUNCTION 0xFFFFFFFF
+
+/* Returned in a0 only from Trusted OS functions */
+#define OPTEE_SMC_RETURN_OK		0x0
+#define OPTEE_SMC_RETURN_ETHREAD_LIMIT	0x1
+#define OPTEE_SMC_RETURN_EBUSY		0x2
+#define OPTEE_SMC_RETURN_ERESUME	0x3
+#define OPTEE_SMC_RETURN_EBADADDR	0x4
+#define OPTEE_SMC_RETURN_EBADCMD	0x5
+#define OPTEE_SMC_RETURN_ENOMEM		0x6
+#define OPTEE_SMC_RETURN_ENOTAVAIL	0x7
+#define OPTEE_SMC_RETURN_IS_RPC(ret)	__optee_smc_return_is_rpc((ret))
+
+static inline bool __optee_smc_return_is_rpc(u32 ret)
+{
+	return ret != OPTEE_SMC_RETURN_UNKNOWN_FUNCTION &&
+	       (ret & OPTEE_SMC_RETURN_RPC_PREFIX_MASK) ==
+			OPTEE_SMC_RETURN_RPC_PREFIX;
+}
+
+#endif /* OPTEE_SMC_H */
