PLIC理论支持15872个interrupt context,在多CPU场景中,PLIC会仲裁所有处于pending状态的外部中断请求,然后将仲裁“胜出”的一个外部中断请求notification给所有的CPU,CPU收到PLIC 的notification后,会向PLIC claim相对应的外部中断源的ID,一旦拿到ID,就会清除该外部中断源的pending状态,所以当多个CPU争抢一个ID时只有一个...
M模式的mip.meip,S模式的sip.seip位表示是否有对应的plic外部中断产生。如果M模式外部中断已经委托到S模式处理,则只有sip.seip置位,mip.meip不再置位。 所以plic的寄存器,对于不同的hart context都要一份,即M模式需要一份,S模式需要一份,后面可以看到plic寄存器的布局就是这么来的。 如下图所示,每个hart都有...
由 guest 所在的 U mode 陷入到 S mode 中,首先将 pc 切换到由 stvec 寄存器指向的中断向量地址,这段指令将会执行一段上下文切换代码,将需要保存的 guest 寄存器保存到一段 Trap Context 地址中(由 hypervisor 进行分配与维护,将在内存虚拟化章节中进行详细讲解),随后跳转到陷阱处理子系统...
除上述之外，虽然两者的中断控制器（PFIC）相较于现行的PLIC均不同，均不是统一入口，而是采用中断向量表寻址的方式，但是V3的中断向量表处存放是一条指令，而V4的向量表既可以存放指令，也可以存放中断处理函数的地址。两者均支持中断嵌套和硬件压栈，区别在于V3最大嵌套两级，V4最大可达八级，同时V3的硬件压栈深度...
To reduce latency, the PLIC core presents all asserted interrupts to the target in priority order, queuing them so that a software interrupt handler can service all pending interrupts without the need to restore the interrupted context. 查看RISC-V Compliant Platform Level Interrupt Controller详细介绍...
AndesCore™ D25F-SE is a 32-bit CPU IP core that supports ISO 26262 ASIL B level functional safety for automotive applications. Approved based on the functional safety assignments of a Safety Element Out-of-Context (SEooC), which includes the ISO 26262 compliant development process and the ...
d1(clint+plic) 本文分析的d1上的clint编程模型,将能够很好的理解riscv的中断编程的设计。 图片上概述了相对标准的RISCV中断控制部分的机制,对于D1单核的情况来看,CLINT只负责处理软件中断和时钟中断,因为这两个中断是RISC-V架构中定义的。经过CLINT不需要进行任何的仲裁,直接将中断(Software与Timer)送入D1的RISC...
AndesCore™ D25F-SE with AE350 Platform D25F-SE pre-integrated with PLIC, timer, debug module, and configurable AE350 AXI/AHB Platform D25F-SE processor core certified for functional safety usage Safety package for safety developments AE350 platform for design references...
Set a PLIC interrupt line as pending. For more info, see "4. Interrupt Pending Bits" of the riscv-plic specs. For context, this can be used for SMP IPI / mailbox drivers: intc: plic: implement riscv_plic_irq_set_pending() … c1ca2ac ycsin requested review from carlocaione, n...
plic-context dcache-timing-w-tlb icache-bank-interleave pmp-parallel JWrong-bug-fix timing-dcache-2 fix-crossPageFault paddr-width refactor-config fma-pipeline bug-fix fix-ldld-vio fix-pagefault-mmio fix-crossline-pagefault tlb-hit-samecycle ...