HRTIMER_SOFTIRQ, // timer RCU_SOFTIRQ, // lock NR_SOFTIRQS }; 也就是在cat /proc/softirqs看到的哪些。 $ cat /proc/softirqs CPU0 CPU1 ... CPU46 CPU47 HI: 2 0 ... 0 1 TIMER: 443727 467971 ... 313696 270110 NET_TX: 57919 65998 ... 42287 54840 NET_RX: 28728 5262341 ... ...
IRQ_TIMER4,这个是系统节拍; IRQ_TIMER2,作用未知(Profiling timer); IRQ_EINT4_7,EINT8_23,外部中断; 任何一个中断发生后,先mask该中断(禁止中断),然后再清除中断请求: mask = 1 << irq; SETREG32(&g_pIntrRegs->INTMSK, mask); OUTREG32(&g_pIntrRegs->SRCPND, mask); OUTREG32(&g_pIntrRegs...
timer_irq.s 这是主汇编程序,定义了中断向量表,进行了各种初始化 代码语言:javascript 复制 GETs3c2410_SFR.s;GET伪指令将s3c2410_SFR.s包含到此文件中,s3c2410_SFR.s是寄存器地址的宏定义GETstartup_head.s;GET伪指令将startup_head.s包含到此文件中,startup_head.s是初始化配置IMPORTkain;IMPORT伪指令指示编译...
实质上就是把s->irq = qdev_get_gpio_in(armv7m, timer_irq[i])。 sysbus_connect_irq(busdev, 0, qdev_get_gpio_in(armv7m, usart_irq[i])); timer_irq保存了每个uart设备需要使用的IRQ号 static constintusart_irq[STM_NUM_USARTS]= {37,38,39,52,53,71}; 此外还有一个需要注意的点,这里...
for (i = 2; i < nrtimers; timer++, i++) { hd.hd_irq[i] = (readl(&timer->hpet_config) & Tn_INT_ROUTE_CNF_MASK) >> Tn_INT_ROUTE_CNF_SHIFT; } hpet_reserve_msi_timers(&hd); hpet_alloc(&hd); } In the above code the yellow highlighted ones are assigned for first 2 time...
IRQ_TIMER4,这个是系统节拍; IRQ_TIMER2,作用未知(Profiling timer); IRQ_EINT4_7,EINT8_23,外部中断; 任何一个中断发生后,先mask 该中断(禁止中断),然后再清除中断请求: mask = 1 << irq; SETREG32(&g_pIntrRegs->INTMSK, mask); OUTREG32(&g_pIntrRegs->SRCPND, ...
* IRQF_PROBE_SHARED - set by callers when they expect sharing mismatches to occur * IRQF_TIMER - Flag to mark this interrupt as timer interrupt * IRQF_PERCPU - Interrupt is per cpu * IRQF_NOBALANCING - Flag to exclude this interrupt from irq balancing ...
浅析linux内核中timer定时器的生成和sofirq软中断调用流程 mod_timer添加的定时器timer在内核的软中断中发生调用,__run_timers会spin_lock_irq(&base->lock);禁止cpu中断,所以我们的timer回调处理函数handler工作在irq关闭的环境中,所以需要作很多考虑,比如在handler中尽量不要执行会引起pending的函数调用,比如...
2 这涉及到SMP IRQ Affinity。首先，我们可以通过如下命令cat /proc/interrupts来获取当前IRQ对应CPU核心的情况，我的电脑有如下返回值：3 CPU0 CPU1 CPU2 CPU3 CPU4 CPU5 CPU6 CPU7 0: 17 0 0 0 0 0 0 0 IR-IO-APIC-edge timer1: 2 0 0 0 0 0 0 0 IR-IO-APIC-edge i80427: 0 0 0 0...
91 range, so above the value as set in theRTIRQ_PRIO_HIGHvariable. Use this variable only for services of which you want to be 100% sure they don't get interrupted by anything else. You will mostly want to put timers in there like rtc or the ALSA high resolution timer (snd-hrtimer...