1 /* 2 * Copyright (c) 2006-2018, RT-Thread Development Team 3 * 4 * SPDX-License-Identifier: Apache-2.0 5 * 6 * Change Logs: 7 * Date Author Notes 8 * 2006-02-24 Bernard first version 9 * 2006-05-03 Bernard add IRQ_DEBUG 10 * 2016-08-09 ArdaFu add interrupt enter and leave hook. 11 * 2018-11-22 Jesven rt_interrupt_get_nest function add disable irq 12 */ 13 14 #include <rthw.h> 15 #include <rtthread.h> 16 17 #ifdef RT_USING_HOOK 18 19 static void (*rt_interrupt_enter_hook)(void); 20 static void (*rt_interrupt_leave_hook)(void); 21 22 /** 23 * @ingroup Hook 24 * This function set a hook function when the system enter a interrupt 25 * 26 * @note the hook function must be simple and never be blocked or suspend. 27 */ 28 void rt_interrupt_enter_sethook(void (*hook)(void)) 29 { 30 rt_interrupt_enter_hook = hook; 31 } 32 /** 33 * @ingroup Hook 34 * This function set a hook function when the system exit a interrupt. 35 * 36 * @note the hook function must be simple and never be blocked or suspend. 37 */ 38 void rt_interrupt_leave_sethook(void (*hook)(void)) 39 { 40 rt_interrupt_leave_hook = hook; 41 } 42 #endif 43 44 /* #define IRQ_DEBUG */ 45 46 /** 47 * @addtogroup Kernel 48 */ 49 50 /**@{*/ 51 52 #ifdef RT_USING_SMP 53 #define rt_interrupt_nest rt_cpu_self()->irq_nest 54 #else 55 volatile rt_uint8_t rt_interrupt_nest = 0; 56 #endif 57 58 /** 59 * This function will be invoked by BSP, when enter interrupt service routine 60 * 61 * @note please don't invoke this routine in application 62 * 63 * @see rt_interrupt_leave 64 */ 65 void rt_interrupt_enter(void) 66 { 67 rt_base_t level; 68 69 RT_DEBUG_LOG(RT_DEBUG_IRQ, ("irq coming..., irq nest:%d\n", 70 rt_interrupt_nest)); 71 72 level = rt_hw_interrupt_disable(); 73 rt_interrupt_nest ++; 74 RT_OBJECT_HOOK_CALL(rt_interrupt_enter_hook,()); 75 rt_hw_interrupt_enable(level); 76 } 77 RTM_EXPORT(rt_interrupt_enter); 78 79 /** 80 * This function will be invoked by BSP, when leave interrupt service routine 81 * 82 * @note please don't invoke this routine in application 83 * 84 * @see rt_interrupt_enter 85 */ 86 void rt_interrupt_leave(void) 87 { 88 rt_base_t level; 89 90 RT_DEBUG_LOG(RT_DEBUG_IRQ, ("irq leave, irq nest:%d\n", 91 rt_interrupt_nest)); 92 93 level = rt_hw_interrupt_disable(); 94 rt_interrupt_nest --; 95 RT_OBJECT_HOOK_CALL(rt_interrupt_leave_hook,()); 96 rt_hw_interrupt_enable(level); 97 } 98 RTM_EXPORT(rt_interrupt_leave); 99 100 /** 101 * This function will return the nest of interrupt. 102 * 103 * User application can invoke this function to get whether current 104 * context is interrupt context. 105 * 106 * @return the number of nested interrupts. 107 */ 108 rt_uint8_t rt_interrupt_get_nest(void) 109 { 110 rt_uint8_t ret; 111 rt_base_t level; 112 113 level = rt_hw_interrupt_disable(); 114 ret = rt_interrupt_nest; 115 rt_hw_interrupt_enable(level); 116 return ret; 117 } 118 RTM_EXPORT(rt_interrupt_get_nest); 119 120 RTM_EXPORT(rt_hw_interrupt_disable); 121 RTM_EXPORT(rt_hw_interrupt_enable); 122 123 /**@}*/ 124 125