当Interrupt 位为 1 时,表示触发异常的来源是中断, Exception Code 按照中断解析。包括机器模式(软件中断、计时器中断、外部中断)、超级用户模式(软件中断、计时器中断、外部中断)、L1数据ECC中断、PMU中断。 当Interrupt 位为 0 时,表示触发异常的来源不是中断, Exception Code 按照异常解析。 具体异常类型说明如下:...
• the option to give each interrupt source at a hart a separate trap entry address; • automatic stacking of register values on interrupt trap entry, and restoration on exit; and • automatic preemption (nesting) of interrupts at a hart, based on priority. It is intended that such fea...
/* 启动定时器，开始产生系统的心跳时钟，此处中断已被关闭 */ prvSetupTimerInterrupt();/* 初始化临界区的嵌套的个数，准备启动第一个任务 */ uxCriticalNesting = 0;/* 启动第一个任务 */ vPortStartFirstTask();/* 执行到vPortStartFirstTask函数，内核已经开始正常的调度 */return 0;}FreeRTOS首先为...
QingKe 32-bit RISC-V2A processor, supporting 2 levels of interrupt nesting Maximum 48MHz system main frequency 2KB SRAM, 16KB Flash Power supply voltage: 3.3/5V Multiple low-power modes: Sleep, Standby Power on/off reset, programmable voltage detector ...
delay_init函数即为使用SysTick进行延时的功能函数,该函数位于nesting_of_interrupts\SYSTEM\delay\delay.c中,其代码如下: (注意:当用户需要运行RTOS时,SysTick通常被用来提供系统时钟节拍) 图5-3 使用SysTick实现延时 5.4.2. N_MCU N级别处理器内核包含的CORE TIMER,主要用于产生计时器中断(Timer Interrupt)和软件...
Interrupt technology is a key technology for processors to respond to external events and plays an important role in the embedded field. The open source RISC-V architecture defines a complete set of interrupt mechanisms with hardware definitions that do not support interrupt nesting in embedded ...
To support non-hosted hypervisors, the bit can cause these accesses to interrupt to a hypervisor. The design also simplifies nesting of hypervisors, in which a hypervisor runs under a hypervisor, and if necessary it lets the kernel use hypervisor features within its own kernel code. As a ...
{// Avoid deadlock by ensuring that devices can interrupt.// 设置sstatus寄存器的SIE为1,即打开S态下的全局中断intr_on();// 寻找下一个需要被调度的进程int found=0;for(p=proc;p<&proc[NPROC];p++){acquire(&p->lock);// 简单遍历proc数组,找到第一个处于RUNNABLE状态的进程// RUNNABLE在xv6中...
Fast programmable interrupt controller + hardware interrupt stack Support 2-level interrupt nesting Support system main frequency 48MHz Memory 2KB volatile data storage area SRAM 16KB program memory CodeFlash 1920B BootLoader 64B non-volatile system configuration memory ...
If multiple peripherals are assigned to the same vector, then the ISR for that vector must poll each of the peripherals assigned to that vector to determine the cause of the interrupt. This also limits interrupt nesting, since only a higher-priority interrupt (or an exception) can interrupt an...