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Project/Src/rt-thread/src/irq.c

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+/*
+ * Copyright (c) 2006-2018, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2006-02-24     Bernard      first version
+ * 2006-05-03     Bernard      add IRQ_DEBUG
+ * 2016-08-09     ArdaFu       add interrupt enter and leave hook.
+ * 2018-11-22     Jesven       rt_interrupt_get_nest function add disable irq
+ */
+
+#include <rthw.h>
+#include <rtthread.h>
+
+#ifdef RT_USING_HOOK
+
+static void (*rt_interrupt_enter_hook)(void);
+static void (*rt_interrupt_leave_hook)(void);
+
+/**
+ * @ingroup Hook
+ * This function set a hook function when the system enter a interrupt 
+ *
+ * @note the hook function must be simple and never be blocked or suspend.
+ */
+void rt_interrupt_enter_sethook(void (*hook)(void))
+{
+    rt_interrupt_enter_hook = hook;
+}
+/**
+ * @ingroup Hook
+ * This function set a hook function when the system exit a interrupt. 
+ *
+ * @note the hook function must be simple and never be blocked or suspend.
+ */
+void rt_interrupt_leave_sethook(void (*hook)(void))
+{
+    rt_interrupt_leave_hook = hook;
+}
+#endif
+
+/* #define IRQ_DEBUG */
+
+/**
+ * @addtogroup Kernel
+ */
+
+/**@{*/
+
+#ifdef RT_USING_SMP
+#define rt_interrupt_nest rt_cpu_self()->irq_nest
+#else
+volatile rt_uint8_t rt_interrupt_nest = 0;
+#endif
+
+/**
+ * This function will be invoked by BSP, when enter interrupt service routine
+ *
+ * @note please don't invoke this routine in application
+ *
+ * @see rt_interrupt_leave
+ */
+void rt_interrupt_enter(void)
+{
+    rt_base_t level;
+
+    RT_DEBUG_LOG(RT_DEBUG_IRQ, ("irq coming..., irq nest:%d\n",
+                                rt_interrupt_nest));
+
+    level = rt_hw_interrupt_disable();
+    rt_interrupt_nest ++;
+    RT_OBJECT_HOOK_CALL(rt_interrupt_enter_hook,());
+    rt_hw_interrupt_enable(level);
+}
+RTM_EXPORT(rt_interrupt_enter);
+
+/**
+ * This function will be invoked by BSP, when leave interrupt service routine
+ *
+ * @note please don't invoke this routine in application
+ *
+ * @see rt_interrupt_enter
+ */
+void rt_interrupt_leave(void)
+{
+    rt_base_t level;
+
+    RT_DEBUG_LOG(RT_DEBUG_IRQ, ("irq leave, irq nest:%d\n",
+                                rt_interrupt_nest));
+
+    level = rt_hw_interrupt_disable();
+    rt_interrupt_nest --;
+    RT_OBJECT_HOOK_CALL(rt_interrupt_leave_hook,());
+    rt_hw_interrupt_enable(level);
+}
+RTM_EXPORT(rt_interrupt_leave);
+
+/**
+ * This function will return the nest of interrupt.
+ *
+ * User application can invoke this function to get whether current
+ * context is interrupt context.
+ *
+ * @return the number of nested interrupts.
+ */
+rt_uint8_t rt_interrupt_get_nest(void)
+{
+    rt_uint8_t ret;
+    rt_base_t level;
+
+    level = rt_hw_interrupt_disable();
+    ret = rt_interrupt_nest;
+    rt_hw_interrupt_enable(level);
+    return ret;
+}
+RTM_EXPORT(rt_interrupt_get_nest);
+
+RTM_EXPORT(rt_hw_interrupt_disable);
+RTM_EXPORT(rt_hw_interrupt_enable);
+
+/**@}*/
+