Flash things onto screen

also make the keyboard interrupt try to work?

rust_experiments/src/lib.rs

@@ -20,25 +20,30 @@ pub extern fn rust_interrupt_handler() {
 }
 
 #[no_mangle]
-pub extern fn rust_handle_keyboard() {
+pub extern fn rust_handle_keyboard(x: u8) {
     checkerboard(vga_buffer::Color::Green);
+    vga_buffer::print_u32(x as u32, 0);
 }
 
-static mut timer_count: u64 = 0;
+static mut global_timer_count: u64 = 0;
 
 #[no_mangle]
 pub extern fn rust_handle_timer() {
+    let gtc = unsafe { global_timer_count };
     unsafe {
-        timer_count += 1;
-    }
-    let tc = unsafe { timer_count };
-
-    vga_buffer::print_u32(tc as u32, 23);
-
-    if (tc % 10) == 0 {
-        vga_buffer::print_u32(tc as u32, 24);
+        global_timer_count += 1;
     }
 
+    timer_callback(gtc);
+}
+
+fn timer_callback(count: u64) {
+    if count % 4 == 0 {
+        checkerboard(vga_buffer::Color::White);
+    }
+    if count % 4 == 2 {
+        checkerboard(vga_buffer::Color::LightCyan);
+    }
 }
 
 #[no_mangle]
@@ -46,15 +51,6 @@ pub extern fn rust_main() {
     clear();
     checkerboard(vga_buffer::Color::Red);
 
-    let mut cur_checkerboard = vga_buffer::Color::Red;
-    let mut update_checkerboard = move || {
-        cur_checkerboard = match cur_checkerboard {
-            vga_buffer::Color::Red => vga_buffer::Color::Blue,
-            _ => vga_buffer::Color::Red,
-        };
-        checkerboard(cur_checkerboard);
-    };
-
     loop {
 
     }

rust_experiments/src/long_mode_init.asm

@@ -95,10 +95,13 @@ handle_keyboard:
     push r11
     pushfq
 
-    in al, 0x60 ;;throw this away
-
+    in al, 0x60
+    shl al, 8
+    in al, 0x61
+    push ax
     cld
     call rust_handle_keyboard
+    pop ax
 
     mov al, END_OF_INTERRUPT
     out PIC1_COMMAND, al