new: earlyprintk

1 files changed, 77 insertions, 5 deletions

diff --git a/kernel/src/io/output/serial/uart_16550.rs b/kernel/src/io/output/serial/uart_16550.rs
index 984854a..65ba4e9 100644
--- a/kernel/src/io/output/serial/uart_16550.rs
+++ b/kernel/src/io/output/serial/uart_16550.rs
@@ -1,15 +1,87 @@
+use bitflags::bitflags;
+use uart_16550::{
+    Config, Uart16550Tty, Uart16550TtyError,
+    backend::{PioBackend, PortIoAddress},
+};
+
+#[repr(u16)]
+// TODO: parse & validate via acpi alors scratch
 pub enum SerialPortAddress {
-    Com1 = 0x3F8,
+    COM1 = 0x3F8,
     Com2 = 0x2F8,
     Com3 = 0x3E8,
     Com4 = 0x2E8,
 }
 
-#[derive(Default)]
-pub struct Uart16550 {}
+bitflags! {
+    pub struct SerialPortBitMask: u8 {
+        const COM1 = 1 << 0;
+        const COM2 = 1 << 1;
+        const COM3 = 1 << 2;
+        const COM4 = 1 << 3;
+    }
+}
+
+impl From<SerialPortAddress> for u16 {
+    fn from(value: SerialPortAddress) -> Self {
+        value as u16
+    }
+}
+
+pub struct Uart16550 {
+    pub coms: [Option<Uart16550Tty<PioBackend>>; 4],
+}
 
 impl Uart16550 {
-    pub fn new() -> Self {
-        Self {}
+    /// # 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(
+        coms_enabled: SerialPortBitMask,
+        mut config: [Option<Config>; 4],
+    ) -> Result<Self, Uart16550TtyError<PortIoAddress>> {
+        unsafe {
+            Ok(Self {
+                coms: [
+                    if coms_enabled.contains(SerialPortBitMask::COM1) {
+                        Some(Uart16550Tty::new_port(
+                            SerialPortAddress::COM1.into(),
+                            config[0].take().unwrap_or_default(),
+                        )?)
+                    } else {
+                        None
+                    },
+                    if coms_enabled.contains(SerialPortBitMask::COM2) {
+                        Some(Uart16550Tty::new_port(
+                            SerialPortAddress::Com2.into(),
+                            config[1].take().unwrap_or_default(),
+                        )?)
+                    } else {
+                        None
+                    },
+                    if coms_enabled.contains(SerialPortBitMask::COM3) {
+                        Some(Uart16550Tty::new_port(
+                            SerialPortAddress::Com3.into(),
+                            config[2].take().unwrap_or_default(),
+                        )?)
+                    } else {
+                        None
+                    },
+                    if coms_enabled.contains(SerialPortBitMask::COM4) {
+                        Some(Uart16550Tty::new_port(
+                            SerialPortAddress::Com4.into(),
+                            config[3].take().unwrap_or_default(),
+                        )?)
+                    } else {
+                        None
+                    },
+                ],
+            })
+        }
     }
 }