rt-thread模糊到清晰系列: irq.c
#include <rthw.h> #include <rtthread.h>
// 进入离开中断的钩子函数 #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 */ /**@{*/
// 多核架构中每个核心独立计算进入嵌套的中断层数 #ifdef RT_USING_SMP #define rt_interrupt_nest rt_cpu_self()->irq_nest #else volatile rt_uint8_t rt_interrupt_nest = 0; #endif
// 中断进入/离开, 以及获取嵌套层数 /** * 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;
/*
#define RT_DEBUG_LOG(type, message) \
do \
{ \
if (type) \
rt_kprintf message; \
} \
while (0)
*/ 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_WEAK 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); /**@}*/