did some restructuring, got multitasking almost working

kernel/drivers/ps2/ps2.S

@@ -0,0 +1,85 @@
+#include "drivers/ps2/ps2.h"
+
+.code32 
+
+.global ps2_wait_input_empty 
+.global ps2_wait_output_full
+.global ps2_write_command
+.global ps2_read_data
+.global ps2_write_data
+.global ps2_flush_output_buffer
+
+# helpers
+ps2_wait_input_empty: #(void) -> void
+    push %ebp
+    mov %esp, %ebp
+1:  
+    inb $PS2_STATUS, %al
+    andb $0x02, %al
+    jnz 1b
+
+    leave
+    ret
+
+ps2_wait_output_full: #(void) -> void
+    push %ebp
+    mov %esp, %ebp 
+1:
+    inb $PS2_STATUS, %al
+    andb $0x01, %al
+    jz 1b
+
+    leave
+    ret
+
+ps2_write_command: #(uint8_t command) -> void
+    push %ebp
+    mov %esp, %ebp
+
+    call ps2_wait_input_empty
+
+    xor %eax, %eax
+    movb 8(%ebp), %al
+    outb %al, $PS2_COMMAND
+
+    leave
+    ret
+
+ps2_read_data: #(void) -> uint8_t
+    push %ebp
+    mov %esp, %ebp
+
+    call ps2_wait_output_full 
+
+    xor %eax, %eax
+    inb $PS2_DATA, %al
+
+    leave
+    ret
+
+ps2_write_data: #(uint8_t) -> void
+    push %ebp 
+    mov %esp, %ebp
+
+    call ps2_wait_input_empty
+    
+    xor %eax, %eax
+    movb 8(%ebp), %al
+    outb %al, $PS2_DATA
+
+    leave
+    ret
+
+
+ps2_flush_output_buffer: #(void) -> void
+    push %ebp
+    mov %esp, %ebp
+1:
+    inb $PS2_STATUS, %al
+    andb $0x01, %al
+    jz 2f
+    inb $PS2_DATA, %al
+    jmp 1b
+2:  
+    leave
+    ret