Function trap_from_kernel

os/src/trap/mod.rs:147–167

(_trap_cx: &TrapContext)

#[no_mangle]
pub fn trap_from_kernel(_trap_cx: &TrapContext) {
    let scause = scause::read();
    let stval = stval::read();
    match scause.cause() {
        Trap::Interrupt(Interrupt::SupervisorExternal) => {
            crate::board::irq_handler();
        }
        Trap::Interrupt(Interrupt::SupervisorTimer) => {
            set_next_trigger();
            check_timer();
            // do not schedule now
        }
        _ => {
            panic!(
                "Unsupported trap from kernel: {:?}, stval = {:#x}!",
                scause.cause(),
                stval
            );
        }
    }
}

pub use context::TrapContext;