Function boot_kernel

tests/integration/kernel_integration.rs:123–133

(
    kernel: &AssembledOutput,
    user: Option<&AssembledOutput>,
    fs_image: Option<&[u8]>,
    input: &str,
    max_steps: u64,
)

    cap: u64,
    done: impl Fn(&str) -> bool,
) -> (StepOutcome, String) {
    const CHUNK: u64 = 1_000_000;
    let mut uart = String::new();
    let mut outcome = StepOutcome::Continue;
    let mut steps = 0u64;
    while steps < cap && !done(&uart) {
        let r = vm.run(CHUNK.min(cap - steps));
        uart.push_str(&r.uart_output);
        steps += CHUNK;
        outcome = r.outcome;
        if matches!(outcome, StepOutcome::Halted(_)) {
            break;
        }
    }