PSA Mutex patch.

platform/security/sl_component/sl_mbedtls_support/inc/threading_alt.h

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+/**************************************************************************/ /**
+ * @file
+ * @brief Threading primitive implementation for mbed TLS
+ *******************************************************************************
+ * # License
+ * <b>Copyright 2021 Silicon Laboratories Inc. www.silabs.com</b>
+ *******************************************************************************
+ *
+ * SPDX-License-Identifier: Zlib
+ *
+ * The licensor of this software is Silicon Laboratories Inc.
+ *
+ * This software is provided 'as-is', without any express or implied
+ * warranty. In no event will the authors be held liable for any damages
+ * arising from the use of this software.
+ *
+ * Permission is granted to anyone to use this software for any purpose,
+ * including commercial applications, and to alter it and redistribute it
+ * freely, subject to the following restrictions:
+ *
+ * 1. The origin of this software must not be misrepresented; you must not
+ *    claim that you wrote the original software. If you use this software
+ *    in a product, an acknowledgment in the product documentation would be
+ *    appreciated but is not required.
+ * 2. Altered source versions must be plainly marked as such, and must not be
+ *    misrepresented as being the original software.
+ * 3. This notice may not be removed or altered from any source distribution.
+ *
+ ******************************************************************************/
+
+#ifndef THREADING_ALT_H
+#define THREADING_ALT_H
+
+/***************************************************************************//**
+ * \addtogroup sl_crypto
+ * \{
+ ******************************************************************************/
+
+/***************************************************************************//**
+ * \addtogroup sl_crypto_threading Threading Primitives
+ * \brief Threading primitive implementation for mbed TLS
+ *
+ * This file contains the glue logic between the mbed TLS threading API
+ * and CMSIS RTOS2 API.
+ *
+ * In order to enable support for Micrium OS backend
+ * the user must make sure SL_CATALOG_MICRIUMOS_KERNEL_PRESENT is defined.
+ * In order to enable support for FreeRTOS backend the user must make sure
+ * SL_CATALOG_FREERTOS_KERNEL_PRESENT is defined.
+ *
+ * Applications created using Simplicity Studio 5 the sl_component_catalog.h
+ * file will define one of the above in order to declare the presence
+ * of a specific RTOS.
+ *
+ * \note
+ * In order to use the Silicon Labs Hardware Acceleration plugins in
+ * multi-threaded applications, select
+ * <b>Mbed TLS support for EFM32/EFR32 crypto acceleration</b> component.
+ *
+ * \{
+ ******************************************************************************/
+
+#include "mbedtls/threading.h"
+#include <stdbool.h>
+
+#if defined(MBEDTLS_THREADING_ALT) && defined(MBEDTLS_THREADING_C)
+
+#if defined(SL_COMPONENT_CATALOG_PRESENT)
+#include "sl_component_catalog.h"
+#endif
+
+#if defined(SL_CATALOG_MICRIUMOS_KERNEL_PRESENT) ||                            \
+    defined(SL_CATALOG_FREERTOS_KERNEL_PRESENT)
+
+#include "cmsis_os2.h"
+#include "sl_assert.h"
+
+#if defined(SL_CATALOG_FREERTOS_KERNEL_PRESENT)
+#include "FreeRTOSConfig.h"
+#if (configSUPPORT_STATIC_ALLOCATION == 1)
+#include "FreeRTOS.h" // StaticSemaphore_t
+#endif
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define SL_THREADING_ALT
+
+#define MUTEX_INIT = {0}
+
+/// SE manager mutex definition for CMSIS RTOS2.
+typedef struct mbedtls_threading_mutex {
+#if defined(SL_CATALOG_FREERTOS_KERNEL_PRESENT) &&                             \
+    (configSUPPORT_STATIC_ALLOCATION == 1)
+  StaticSemaphore_t static_sem_object;
+#endif
+  osMutexAttr_t mutex_attr;
+  osMutexId_t mutex_ID;
+} mbedtls_threading_mutex_t;
+
+/**
+ * \brief          Initialize a given mutex
+ *
+ * \param mutex    Pointer to the mutex needing initialization
+ */
+static inline void THREADING_InitMutex(mbedtls_threading_mutex_t *mutex) {
+  if (mutex == NULL) {
+    return;
+  }
+
+#if defined(SL_CATALOG_FREERTOS_KERNEL_PRESENT) &&                             \
+    (configSUPPORT_STATIC_ALLOCATION == 1)
+  mutex->mutex_attr.cb_mem = &mutex->static_sem_object;
+  mutex->mutex_attr.cb_size = sizeof(mutex->static_sem_object);
+#endif
+
+  mutex->mutex_ID = osMutexNew(&mutex->mutex_attr);
+
+  EFM_ASSERT(mutex->mutex_ID != NULL);
+}
+
+/**
+ * \brief          Free a given mutex
+ *
+ * \param mutex    Pointer to the mutex being freed
+ */
+static inline void THREADING_FreeMutex(mbedtls_threading_mutex_t *mutex) {
+  if (mutex == NULL) {
+    return;
+  }
+
+  osStatus_t status = osMutexDelete(mutex->mutex_ID);
+  EFM_ASSERT(status == osOK);
+}
+
+/**
+ * \brief          Pend on a mutex
+ *
+ * \param mutex    Pointer to the mutex being pended on
+ *
+ * \return         RTOS_ERR_NONE on success, error code otherwise.
+ */
+static inline int
+THREADING_TakeMutexBlocking(mbedtls_threading_mutex_t *mutex) {
+  if (mutex == NULL) {
+    return MBEDTLS_ERR_THREADING_BAD_INPUT_DATA;
+  }
+
+  osStatus_t status = osOK;
+  if (osKernelGetState() == osKernelRunning) {
+    status = osMutexAcquire(mutex->mutex_ID, osWaitForever);
+  }
+  return (status == osOK ? 0 : MBEDTLS_ERR_THREADING_MUTEX_ERROR);
+}
+
+/**
+ * \brief          Try to own a mutex without waiting
+ *
+ * \param mutex    Pointer to the mutex being tested
+ *
+ * \return         RTOS_ERR_NONE on success (= mutex successfully owned), error
+ * code otherwise.
+ */
+static inline int
+THREADING_TakeMutexNonBlocking(mbedtls_threading_mutex_t *mutex) {
+  if (mutex == NULL) {
+    return MBEDTLS_ERR_THREADING_BAD_INPUT_DATA;
+  }
+
+  osStatus_t status = osOK;
+  if (osKernelGetState() == osKernelRunning) {
+    status = osMutexAcquire(mutex->mutex_ID, 0u);
+  }
+  return (status == osOK ? 0 : MBEDTLS_ERR_THREADING_MUTEX_ERROR);
+}
+
+/**
+ * \brief          Release a mutex
+ *
+ * \param mutex    Pointer to the mutex being released
+ *
+ * \return         RTOS_ERR_NONE on success, error code otherwise.
+ */
+static inline int THREADING_GiveMutex(mbedtls_threading_mutex_t *mutex) {
+  if (mutex == NULL) {
+    return MBEDTLS_ERR_THREADING_BAD_INPUT_DATA;
+  }
+
+  osStatus_t status = osOK;
+  if (osKernelGetState() == osKernelRunning) {
+    status = osMutexRelease(mutex->mutex_ID);
+  }
+  return (status == osOK ? 0 : MBEDTLS_ERR_THREADING_MUTEX_ERROR);
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // SL_CATALOG_MICRIUMOS_KERNEL_PRESENT ||
+       // SL_CATALOG_FREERTOS_KERNEL_PRESENT
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Forward declaration of threading_set_alt */
+void mbedtls_threading_set_alt(
+    void (*mutex_init)(mbedtls_threading_mutex_t *),
+    void (*mutex_free)(mbedtls_threading_mutex_t *),
+    int (*mutex_lock)(mbedtls_threading_mutex_t *),
+    int (*mutex_unlock)(mbedtls_threading_mutex_t *));
+
+/**
+ * \brief          Helper function for setting up the mbed TLS threading
+ * subsystem
+ */
+static inline void THREADING_setup(void) {
+  mbedtls_threading_set_alt(&THREADING_InitMutex, &THREADING_FreeMutex,
+                            &THREADING_TakeMutexBlocking, &THREADING_GiveMutex);
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* MBEDTLS_THREADING_ALT && MBEDTLS_THREADING_C */
+
+/** \} (end addtogroup sl_crypto_threading) */
+/** \} (end addtogroup sl_crypto) */
+
+#endif /* THREADING_ALT_H */