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components/libraries/util/app_util_platform.c

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+/**
+ * Copyright (c) 2014 - 2020, Nordic Semiconductor ASA
+ *
+ * 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, except as embedded into a Nordic
+ *    Semiconductor ASA integrated circuit in a product or a software update for
+ *    such product, 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.
+ *
+ * 3. Neither the name of Nordic Semiconductor ASA nor the names of its
+ *    contributors may be used to endorse or promote products derived from this
+ *    software without specific prior written permission.
+ *
+ * 4. This software, with or without modification, must only be used with a
+ *    Nordic Semiconductor ASA integrated circuit.
+ *
+ * 5. Any software provided in binary form under this license must not be reverse
+ *    engineered, decompiled, modified and/or disassembled.
+ *
+ * THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
+ * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA 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.
+ *
+ */
+#include "app_util_platform.h"
+
+#ifdef SOFTDEVICE_PRESENT
+/* Global nvic state instance, required by nrf_nvic.h */
+nrf_nvic_state_t nrf_nvic_state;
+#endif
+
+static uint32_t m_in_critical_region = 0;
+
+void app_util_disable_irq(void)
+{
+    __disable_irq();
+    m_in_critical_region++;
+}
+
+void app_util_enable_irq(void)
+{
+    m_in_critical_region--;
+    if (m_in_critical_region == 0)
+    {
+        __enable_irq();
+    }
+}
+
+void app_util_critical_region_enter(uint8_t *p_nested)
+{
+#if __CORTEX_M == (0x04U)
+    ASSERT(APP_LEVEL_PRIVILEGED == privilege_level_get())
+#endif
+
+#if defined(SOFTDEVICE_PRESENT)
+    /* return value can be safely ignored */
+    (void) sd_nvic_critical_region_enter(p_nested);
+#else
+    app_util_disable_irq();
+#endif
+}
+
+void app_util_critical_region_exit(uint8_t nested)
+{
+#if __CORTEX_M == (0x04U)
+    ASSERT(APP_LEVEL_PRIVILEGED == privilege_level_get())
+#endif
+
+#if defined(SOFTDEVICE_PRESENT)
+    /* return value can be safely ignored */
+    (void) sd_nvic_critical_region_exit(nested);
+#else
+    app_util_enable_irq();
+#endif
+}
+
+
+uint8_t privilege_level_get(void)
+{
+#if __CORTEX_M == (0x00U) || defined(_WIN32) || defined(__unix) || defined(__APPLE__)
+    /* the Cortex-M0 has no concept of privilege */
+    return APP_LEVEL_PRIVILEGED;
+#elif __CORTEX_M >= (0x04U)
+    uint32_t isr_vector_num = __get_IPSR() & IPSR_ISR_Msk ;
+    if (0 == isr_vector_num)
+    {
+        /* Thread Mode, check nPRIV */
+        int32_t control = __get_CONTROL();
+        return control & CONTROL_nPRIV_Msk ? APP_LEVEL_UNPRIVILEGED : APP_LEVEL_PRIVILEGED;
+    }
+    else
+    {
+        /* Handler Mode, always privileged */
+        return APP_LEVEL_PRIVILEGED;
+    }
+#endif
+}
+
+
+uint8_t current_int_priority_get(void)
+{
+    uint32_t isr_vector_num = __get_IPSR() & IPSR_ISR_Msk ;
+    if (isr_vector_num > 0)
+    {
+        int32_t irq_type = ((int32_t)isr_vector_num - EXTERNAL_INT_VECTOR_OFFSET);
+        return (NVIC_GetPriority((IRQn_Type)irq_type) & 0xFF);
+    }
+    else
+    {
+        return APP_IRQ_PRIORITY_THREAD;
+    }
+}