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use core::array;
use strum::{EnumIter, IntoEnumIterator};
use uart_16550::{
Config, Uart16550Tty, Uart16550TtyError,
backend::{PioBackend, PortIoAddress},
};
#[derive(EnumIter)]
#[repr(u16)]
// TODO: parse & validate via acpi alors scratch
enum SerialPortAddress {
COM1 = 0x3F8,
COM2 = 0x2F8,
COM3 = 0x3E8,
COM4 = 0x2E8,
}
impl From<SerialPortAddress> for u16 {
fn from(value: SerialPortAddress) -> Self {
value as u16
}
}
pub struct Uart16550 {
pub coms: [Option<Uart16550Tty<PioBackend>>; 4],
}
impl Uart16550 {
/// # Safety
///
/// Callers must ensure that the base port is valid and safe to use
/// for the **whole lifetime** of the device(exclusively). Further, all
/// [`NUM_REGISTERS`] registers must be safely reachable from the base
/// address.
///
/// [`NUM_REGISTERS`]: crate::spec::NUM_REGISTERS
pub unsafe fn init(
// TODO: more type safe
mut config: [Option<Config>; 4],
) -> Result<Self, Uart16550TtyError<PortIoAddress>> {
let mut addrs = SerialPortAddress::iter();
Ok(
Self {
coms: array::try_from_fn(
|i| {
config[i]
.take()
.map(
|c| unsafe {
Uart16550Tty::new_port(
addrs.next().unwrap().into(),
c,
)
},
)
.transpose()
},
)?,
},
)
}
}
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