more stuff!

2026-08-21 15:24:31 -04:00
parent 58fd50a595
commit a9f3182de3
9 changed files with 116 additions and 4 deletions
@@ -0,0 +1,52 @@
+use core::arch::asm;
+
+const SERIAL_COM1: u16 = 0x3F8;
+
+pub unsafe fn init() {
+    outb(SERIAL_COM1 + 1, 0x00); // Disable interrupts  
+
+    outb(SERIAL_COM1 + 3, 0x80);
+
+    outb(SERIAL_COM1, 0x03); // 38400 baud (divisor = 3)
+    outb(SERIAL_COM1 + 1, 0x00);
+
+    outb(SERIAL_COM1 + 3, 0x03);
+
+    outb(SERIAL_COM1 + 2, 0xC7);
+
+    outb(SERIAL_COM1 + 4, 0x0B);
+}
+
+pub unsafe fn write_byte(byte: u8) {
+    while (inb(SERIAL_COM1 + 5) & 0x20) == 0 {}
+    outb(SERIAL_COM1, byte);
+}
+
+pub unsafe fn write_bytes(bytes: &[u8]) {
+    for &byte in bytes {
+        write_byte(byte);
+    }
+}
+
+pub unsafe fn write_str(string: &str) {
+    write_bytes(string.as_bytes());
+}
+
+unsafe fn outb(port: u16, value: u8) {
+    asm!(
+        "out dx, al",
+        in("dx") port,
+        in("al") value,
+        options(nostack, nomem, preserves_flags)
+    );
+}
+
+unsafe fn inb(port: u16) -> u8 {
+    let value: u8;
+
+    unsafe {
+        asm!("in al, dx",in("dx") port,out("al") value,options(nostack, nomem, preserves_flags));
+    }
+    
+    value
+}