382bbacb0a
Also, this eases readability. The new API can be used any time all FP registers must be manually saved and restored for an operation. Signed-off-by: Øyvind Rønningstad <oyvind.ronningstad@nordicsemi.no>
98 lines
2.2 KiB
C
98 lines
2.2 KiB
C
/*
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* Copyright (c) 2019,2020 Linaro Limited
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* Copyright (c) 2021 Nordic Semiconductor ASA
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <device.h>
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#include <init.h>
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#include <kernel.h>
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#include <arch/arm/aarch32/cortex_m/cmsis.h>
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#include <arch/arm/aarch32/cortex_m/fpu.h>
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#include <tfm_ns_interface.h>
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/**
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* @file @brief Zephyr's TF-M NS interface implementation
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*
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*/
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/* Global mutex to be used by the TF-M NS dispatcher, preventing
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* the Non-Secure application from initiating multiple parallel
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* TF-M secure calls.
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*/
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K_MUTEX_DEFINE(tfm_mutex);
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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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if (k_mutex_lock(&tfm_mutex, K_FOREVER) != 0) {
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return (int32_t)TFM_ERROR_GENERIC;
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}
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#if !defined(CONFIG_ARM_NONSECURE_PREEMPTIBLE_SECURE_CALLS)
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/*
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* Prevent the thread from being preempted, while executing a Secure
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* function. This is required to prevent system crashes that could
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* occur, if a thead context switch is triggered in the middle of a
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* Secure call.
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*/
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k_sched_lock();
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#endif
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#if defined(CONFIG_ARM_NONSECURE_PREEMPTIBLE_SECURE_CALLS)
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struct fpu_ctx_full context_buffer;
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z_arm_save_fp_context(&context_buffer);
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#endif
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result = fn(arg0, arg1, arg2, arg3);
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#if defined(CONFIG_ARM_NONSECURE_PREEMPTIBLE_SECURE_CALLS)
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z_arm_restore_fp_context(&context_buffer);
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#endif
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#if !defined(CONFIG_ARM_NONSECURE_PREEMPTIBLE_SECURE_CALLS)
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/* Unlock the scheduler, to allow the thread to be preempted. */
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k_sched_unlock();
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#endif
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k_mutex_unlock(&tfm_mutex);
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return result;
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}
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enum tfm_status_e tfm_ns_interface_init(void)
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{
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/*
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* The static K_MUTEX_DEFINE handles mutex initialization,
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* so this function may be implemented as no-op.
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*/
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return TFM_SUCCESS;
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}
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#if defined(TFM_PSA_API)
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#include "psa_manifest/sid.h"
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#endif /* TFM_PSA_API */
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static int ns_interface_init(const struct device *arg)
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{
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ARG_UNUSED(arg);
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__ASSERT(tfm_ns_interface_init() == TFM_SUCCESS,
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"TF-M NS interface init failed");
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return 0;
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}
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/* Initialize the TFM NS interface */
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SYS_INIT(ns_interface_init, POST_KERNEL,
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CONFIG_KERNEL_INIT_PRIORITY_DEFAULT);
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