Keyboard handler works

You do have you make sure to read from 0x60 to make further interrupts
happen. Also I'm told this might be unreliable because you actually have
to make sure you're draining all the bytes, and this assumes only one
byte

rust_experiments/src/long_mode_init.asm

@@ -75,6 +75,13 @@ call_interrupt:
     ret
 
 sample_handler:
+%define END_OF_INTERRUPT 0x20
+
+%define PIC1_COMMAND 0x20
+%define PIC1_DATA 0x21
+%define PIC2_COMMAND 0xa0
+%define PIC2_DATA 0xa1
+
     ;mov word [0xb8000], 0x4f72
     push rax
     push rcx
@@ -83,10 +90,19 @@ sample_handler:
     push r9
     push r10
     push r11
+    pushfq
+
+    in al, 0x60 ;;thorw this away
 
     cld
     call rust_interrupt_handler
+    call spin_loop_64
 
+    mov al, END_OF_INTERRUPT
+    out PIC1_COMMAND, al
+    out PIC2_COMMAND, al
+
+    popfq
     pop r11
     pop r10
     pop r9
@@ -95,7 +111,6 @@ sample_handler:
     pop rcx
     pop rax
 
-    call spin_loop_64
     iretq
 
 %define int_num 9