73 lines
1.7 KiB
C
73 lines
1.7 KiB
C
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/*
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* Copyright (c) 2017-2021, Arm Limited. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*
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*/
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/*
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* An example to implement tfm_ns_interface_dispatch() in NS RTOS to integrate
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* TF-M interface on Armv8-M TrustZone based platforms.
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*
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* In this example, NS OS calls mutex in tfm_ns_interface_dispatch() to
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* synchronize multiple NS client calls.
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* NS OS pseudo code in this example is not based on any specific RTOS.
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*
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* Please note that this example cannot be built directly.
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*/
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#include <stdint.h>
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/* Include NS RTOS specific mutex declarations */
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#include <os/os.h>
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#include "tfm_ns_interface.h"
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#include "components/log.h"
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/* Static ns lock handle */
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static beken_mutex_t ns_lock_handle = NULL;
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void ns_interface_delay(INT32 num)
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{
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volatile INT32 i, j;
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for (i = 0; i < num; i ++) {
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for (j = 0; j < 100; j ++)
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;
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}
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}
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/* Initialize the ns lock */
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int32_t ns_interface_lock_init(void)
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{
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if (ns_lock_handle) {
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return BK_OK;
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}
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/* NS RTOS specific mutex creation/initialization */
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rtos_init_mutex(&ns_lock_handle);
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if (ns_lock_handle) {
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return BK_OK;
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}
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return BK_FAIL;
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}
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int32_t tfm_ns_interface_dispatch(veneer_fn fn,
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uint32_t arg0, uint32_t arg1,
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uint32_t arg2, uint32_t arg3)
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{
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int32_t result;
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/* TF-M request protected by NS lock. */
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while (rtos_lock_mutex(&ns_lock_handle) != BK_OK);
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result = fn(arg0, arg1, arg2, arg3);
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/*
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* Whether to check/handle lock release return code depends on NS RTOS
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* specific implementation and usage scenario.
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*/
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rtos_unlock_mutex(&ns_lock_handle);
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return result;
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}
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