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gil 2024-05-16 08:23:08 -05:00
parent ef07d172ff
commit aaf64d0a2d
1 changed files with 4 additions and 1 deletions
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src/main.rs
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@ -17,7 +17,7 @@ unsafe extern "C" fn _enter() -> ! {
// load hartid into t0; if t0 =/= 0, then jump to busy loop // load hartid into t0; if t0 =/= 0, then jump to busy loop
"csrr t0, mhartid", "csrr t0, mhartid",
"bnez t0, 3f", "bnez t0, 3f",
// before we use the `la` pseudo-instruction for the first time, // before we use the `la` pseudo-instruction for the first time,
// we need to set `gp` (look up linker relaxation) // we need to set `gp` (look up linker relaxation)
".option push", // pushes the current option stack ".option push", // pushes the current option stack
@ -73,8 +73,10 @@ extern "C" fn start() -> ! {
unsafe { uart::init_console(0x1000_0000) }; unsafe { uart::init_console(0x1000_0000) };
println!("Hello, world!"); println!("Hello, world!");
// print current hartid
println!("hartid: {}", riscv::register::mhartid::read()); println!("hartid: {}", riscv::register::mhartid::read());
// poll console for input and print characters back
loop { loop {
let c = uart::CONSOLE.lock().as_mut().and_then(uart::Device::get); let c = uart::CONSOLE.lock().as_mut().and_then(uart::Device::get);
if let Some(c) = c { if let Some(c) = c {
@ -85,6 +87,7 @@ extern "C" fn start() -> ! {
#[panic_handler] #[panic_handler]
fn on_panic(info: &PanicInfo) -> ! { fn on_panic(info: &PanicInfo) -> ! {
// print panic info and hang
println!("{}", info); println!("{}", info);
loop {} loop {}