From 6a5c32fa6ae8ec34e3e5b44d7e5a78ded8fe729b Mon Sep 17 00:00:00 2001
From: salmonik <salmonik@tuta.io>
Date: Fri, 31 Jul 2026 02:58:31 +0200
Subject: restructure: rsnix kernel + shell crate + rsdos entry point
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Architecture:
  rs-dos/  (workspace root, was raisernics/)
  ├── rsnix/     — kernel lib crate (uefi, serial, gop, ps2, interrupts, memory)
  ├── shell/     — shell lib crate (prompt, commands, line input)
  ├── rsdos/     — binary crate (efi_main, init, panic handler)
  └── rsboot/    — future git submodule

No functional changes — boots to shell prompt identically.
Version auto-pulled from Cargo.toml via env!("CARGO_PKG_VERSION").
---
 src/serial.rs | 118 ----------------------------------------------------------
 1 file changed, 118 deletions(-)
 delete mode 100644 src/serial.rs

(limited to 'src/serial.rs')

diff --git a/src/serial.rs b/src/serial.rs
deleted file mode 100644
index 03fa570..0000000
--- a/src/serial.rs
+++ /dev/null
@@ -1,118 +0,0 @@
-/// UART 16550 serial driver — port-mapped I/O on COM1 (0x3F8)
-use core::fmt;
-
-const COM1: u16 = 0x3F8;
-
-const DATA_REG: u16 = COM1;
-const INTR_ENABLE: u16 = COM1 + 1;
-const FIFO_CONTROL: u16 = COM1 + 2;
-const LINE_CONTROL: u16 = COM1 + 3;
-const MODEM_CONTROL: u16 = COM1 + 4;
-const LINE_STATUS: u16 = COM1 + 5;
-
-const LSR_TX_EMPTY: u8 = 0x20;
-const LSR_DATA_READY: u8 = 0x01;
-
-/// Initialise the UART with 115200 baud, 8N1.
-pub fn init() {
-    unsafe {
-        // Disable interrupts
-        port_out(INTR_ENABLE, 0x00);
-        // Set DLAB=1 (baud rate divisor)
-        port_out(LINE_CONTROL, 0x80);
-        // Divisor = 1 → 115200 baud (with 1.8432 MHz clock)
-        port_out(DATA_REG, 0x01);
-        port_out(INTR_ENABLE, 0x00);
-        // 8-bit, 1 stop, no parity, DLAB=0
-        port_out(LINE_CONTROL, 0x03);
-        // Enable FIFO, clear, 14-byte threshold
-        port_out(FIFO_CONTROL, 0xC7);
-        // RTS/DSR set
-        port_out(MODEM_CONTROL, 0x0B);
-    }
-}
-
-/// Write a single byte to the serial port (blocking poll).
-pub fn put_byte(b: u8) {
-    unsafe {
-        // Wait for transmitter holding register empty
-        while port_in(LINE_STATUS) & LSR_TX_EMPTY == 0 {}
-        port_out(DATA_REG, b);
-    }
-}
-
-/// Read a single byte from the serial port (blocking poll).
-pub fn get_byte() -> u8 {
-    unsafe {
-        while port_in(LINE_STATUS) & LSR_DATA_READY == 0 {}
-        port_in(DATA_REG)
-    }
-}
-
-/// Non-blocking read: returns Some(byte) if data ready, None otherwise.
-pub fn try_get_byte() -> Option<u8> {
-    unsafe {
-        if port_in(LINE_STATUS) & LSR_DATA_READY != 0 {
-            Some(port_in(DATA_REG))
-        } else {
-            None
-        }
-    }
-}
-
-/// Write a string to serial.
-pub fn write_str(s: &str) {
-    for &b in s.as_bytes() {
-        if b == b'\n' {
-            put_byte(b'\r');
-        }
-        put_byte(b);
-    }
-}
-
-// ---------------------------------------------------------------------------
-// fmt::Write implementation
-// ---------------------------------------------------------------------------
-pub struct SerialWriter;
-
-impl fmt::Write for SerialWriter {
-    fn write_str(&mut self, s: &str) -> fmt::Result {
-        write_str(s);
-        Ok(())
-    }
-}
-
-/// Helper macro — prints to serial via format_args!.
-#[macro_export]
-macro_rules! serial_print {
-    ($($arg:tt)*) => {{
-        use core::fmt::Write;
-        let _ = write!(&mut $crate::serial::SerialWriter, $($arg)*);
-    }};
-}
-
-#[macro_export]
-macro_rules! serial_println {
-    () => { $crate::serial::write_str("\r\n"); };
-    ($($arg:tt)*) => {{
-        $crate::serial_print!($($arg)*);
-        $crate::serial::write_str("\r\n");
-    }};
-}
-
-// ---------------------------------------------------------------------------
-// Port I/O helpers
-// ---------------------------------------------------------------------------
-unsafe fn port_in(port: u16) -> u8 {
-    let val: u8;
-    unsafe {
-        core::arch::asm!("in al, dx", out("al") val, in("dx") port, options(nostack, preserves_flags));
-    }
-    val
-}
-
-unsafe fn port_out(port: u16, val: u8) {
-    unsafe {
-        core::arch::asm!("out dx, al", in("al") val, in("dx") port, options(nostack, preserves_flags));
-    }
-}
-- 
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