feat(esp_tee): Support for ESP-TEE - the main component

components/esp_tee/src/esp_tee.c

@@ -0,0 +1,76 @@
+/*
+ * SPDX-FileCopyrightText: 2024 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <stdarg.h>
+
+#include "esp_attr.h"
+#include "esp_private/cache_utils.h"
+
+#include "freertos/FreeRTOS.h"
+#include "freertos/semphr.h"
+#include "freertos/task.h"
+
+#include "esp_tee.h"
+#include "secure_service_num.h"
+
+/* See esp_tee_u2m_switch.S */
+extern uint32_t _u2m_switch(int argc, va_list ap);
+
+static SemaphoreHandle_t s_tee_mutex;
+static StaticSemaphore_t s_tee_mutex_buf;
+
+static void init_mutex(void)
+{
+    static bool is_first_call = true;
+    if (is_first_call) {
+        s_tee_mutex = xSemaphoreCreateMutexStatic(&s_tee_mutex_buf);
+        is_first_call = false;
+    }
+}
+
+/**
+ * TEE interface API used by untrusted side application
+ * to call secure service in trusted side
+ */
+uint32_t esp_tee_service_call(int argc, ...)
+{
+    init_mutex();
+
+    uint32_t val = UINT32_MAX;
+    va_list ap;
+    va_start(ap, argc);
+
+    if (xTaskGetSchedulerState() == taskSCHEDULER_RUNNING) {
+        if (xSemaphoreTake(s_tee_mutex, portMAX_DELAY) == pdTRUE) {
+            val = _u2m_switch(argc, ap);
+            xSemaphoreGive(s_tee_mutex);
+        }
+    } else {
+        val = _u2m_switch(argc, ap);
+    }
+
+    va_end(ap);
+    return val;
+}
+
+IRAM_ATTR uint32_t esp_tee_service_call_with_noniram_intr_disabled(int argc, ...)
+{
+    uint32_t val = UINT32_MAX;
+    va_list ap;
+    va_start(ap, argc);
+
+    /* NOTE: Disabling the scheduler and non-IRAM residing interrupts */
+    spi_flash_op_lock();
+    esp_intr_noniram_disable();
+
+    val = _u2m_switch(argc, ap);
+
+    esp_intr_noniram_enable();
+    spi_flash_op_unlock();
+
+    va_end(ap);
+    return val;
+}