feat: misc

Nicer kernel, now can fetch multiboot2 boot info

members/oxide/src/vga/mod.rs

@@ -54,7 +54,7 @@ impl<M: TextMode> VgaBuffer<M> {
     where
         [[(u8, u8); M::WIDTH as usize]; M::HEIGHT as usize]:,
     {
-        unsafe { core::mem::transmute(Self::VGA_ADDR) }
+        unsafe { &mut *Self::VGA_ADDR.cast() }
     }
 }
 

members/oxide/src/vga/vt.rs

@@ -1,3 +1,5 @@
+use core::fmt::Write;
+
 use crate::vga::{ColorNibble, TextMode, VgaBuffer, VgaColor};
 
 pub struct Writer<M: TextMode> {
@@ -52,6 +54,18 @@ where
         }
     }
 
+    pub fn print_n(&mut self, n: u32) {
+        const BASE: u32 = 10;
+
+        if n == 0 {
+            // TODO: print a 0 if no recursion in the future
+        } else {
+            let digit = (n % BASE) as u8;
+            self.print_n(n / 10);
+            self.write(&[b'0' + digit]);
+        }
+    }
+
     pub fn write(&mut self, data: &[u8]) {
         const BAD_CHAR_COL: VgaColor = VgaColor::new(ColorNibble::WHITE, ColorNibble::RED);
 
@@ -94,3 +108,13 @@ where
         }
     }
 }
+
+impl<M: TextMode> Write for Writer<M>
+where
+    [[(u8, u8); M::WIDTH as usize]; M::HEIGHT as usize]:,
+{
+    fn write_str(&mut self, s: &str) -> core::fmt::Result {
+        self.write(s.as_bytes());
+        Ok(())
+    }
+}