Worked more on EGA text mode output. Made good progress.

kernel/config.aphro.example

@@ -1,5 +1,5 @@
-# config.aphro for aphrodite devel-bc19d1a-out-of-tree
+# config.aphro for aphrodite devel-2df6e24-out-of-tree
-CFG_VERSION=devel-bc19d1a-out-of-tree
+CFG_VERSION=devel-2df6e24-out-of-tree
 CONT_WITH_DIFFERENT_VERSION=false
 
 # Begin metadata

kernel/grub/boot/grub/grub.cfg

@@ -1,8 +1,8 @@
 set timeout=15
 set default=0
 
-menuentry "Aphrodite" --class aphrodite --class kernel --class os $menuentry_id_option 'aphrodite-basic-devel-bc19d1a-out-of-tree' {
+menuentry "Aphrodite" --class aphrodite --class kernel --class os $menuentry_id_option 'aphrodite-basic-devel-2df6e24-out-of-tree' {
-    echo 'Loading Aphrodite aphrodite-devel-bc19d1a-out-of-tree ...'
+    echo 'Loading Aphrodite aphrodite-devel-2df6e24-out-of-tree ...'
     multiboot2 /boot/aphrodite.kernel
     boot
 }

kernel/src/include/arch/x86/egatext.rs

@@ -82,4 +82,29 @@ impl FramebufferInfo {
         }
         Ok((x, y))
     }
-}
+
+    /// Disables the cursor.
+    pub fn disable_cursor(self) {
+        super::ports::outb(0x3D4, 0x0A);
+        super::ports::outb(0x3D5, 0x20);
+    }
+
+    /// Enables the cursor.
+    pub fn enable_cursor(self, start_scan: u8, end_scan: u8) {
+        super::ports::outb(0x3D4, 0x0A);
+        super::ports::outb(0x3D5, (super::ports::inb(0x3D5) & 0xC0) | start_scan);
+
+        super::ports::outb(0x3D4, 0x0B);
+        super::ports::outb(0x3D5, (super::ports::inb(0x3D5) & 0xE0) | end_scan);
+    }
+
+    /// Sets the cursor's location.
+    pub fn set_cursor_location(self, pos: (u32, u32)) {
+        let addr = pos.1 * self.width + pos.0;
+
+        super::ports::outb(0x3D4, 0x0F);
+        super::ports::outb(0x3D5, (addr & 0xFF) as u8);
+        super::ports::outb(0x3D4, 0x0E);
+        super::ports::outb(0x3D5, ((addr >> 8) & 0xFF) as u8);
+    }
+}

kernel/src/include/arch/x86/output.rs

@@ -123,6 +123,7 @@ macro_rules! message_funcs {
                     OUTPUT_TERM_POSITION = info.write_str(OUTPUT_TERM_POSITION, $prefix, WHITE_ON_BLACK)?;
                     OUTPUT_TERM_POSITION = info.write_str(OUTPUT_TERM_POSITION, s, WHITE_ON_BLACK)?;
                     OUTPUT_TERM_POSITION.1 += 1;
+                    OUTPUT_TERM_POSITION.0 = 0;
                 }
                 Ok(())
             }
@@ -147,6 +148,7 @@ macro_rules! message_funcs {
                     OUTPUT_TERM_POSITION = info.write_str(OUTPUT_TERM_POSITION, $prefix, WHITE_ON_BLACK)?;
                     OUTPUT_TERM_POSITION = info.write_bytes(OUTPUT_TERM_POSITION, s, WHITE_ON_BLACK)?;
                     OUTPUT_TERM_POSITION.1 += 1;
+                    OUTPUT_TERM_POSITION.0 = 0;
                 }
                 Ok(())
             }
@@ -188,6 +190,7 @@ macro_rules! message_funcs {
                     }
                     OUTPUT_TERM_POSITION = info.write_str(OUTPUT_TERM_POSITION, s, WHITE_ON_BLACK)?;
                     OUTPUT_TERM_POSITION.1 += 1;
+                    OUTPUT_TERM_POSITION.0 = 0;
                 }
                 Ok(())
             }
@@ -210,6 +213,7 @@ macro_rules! message_funcs {
                     }
                     OUTPUT_TERM_POSITION = info.write_bytes(OUTPUT_TERM_POSITION, s, WHITE_ON_BLACK)?;
                     OUTPUT_TERM_POSITION.1 += 1;
+                    OUTPUT_TERM_POSITION.0 = 0;
                 }
                 Ok(())
             }

kernel/src/include/arch/x86/ports.rs

@@ -26,7 +26,7 @@ pub fn inb(port: u16) -> u8 {
     let out;
     unsafe {
         asm!(
-            "in {}, {1:x}", out(reg_byte) out, in(reg) port
+            "in al, dx", out("al") out, in("dx") port
         )
     }
     out

kernel/src/internal/arch/x86/entry.rs

@@ -278,10 +278,11 @@ extern "C" fn _start() -> ! {
                         bpp: framebuffer_info.bpp
                     };
                     ega.clear_screen(BLACK_ON_BLACK);
+                    ega.enable_cursor(14, 15);
+                    ega.set_cursor_location((0, 0));
+                    tdebugsln("Testing EGA Text framebuffer...", ega).unwrap();
+                    tdebugsln("Testing EGA Text framebuffer...", ega).unwrap();
                     tdebugsln("Testing EGA Text framebuffer...", ega).unwrap();
-                    for _ in 0..100000000 {
-                        asm!("nop");
-                    }
                 },
                 _ => {
                     unreachable!();