;TODO fix null problem, allow passing value insted of pointer
bios_print:
pusha
mov ah, 0x0e 

.print_loop:
mov al, [bx]          
cmp al, 0             
je .fini   

test cx, cx           ; if cx is zero, ascii, otherwise hex string
jne .print_hex
int 0x10              
.print_hex_ret:
inc bx               
jmp .print_loop   

.fini:
mov al, 0xd           
int 0x10
mov al, 0xa           
int 0x10
popa
ret


.print_hex:
mov al, '0'
int 0x10

mov al, 'x'
int 0x10

mov al, [bx]              
shr al, 4
call .bios_print_nibble

mov al, [bx]
and al, 0x0f
call .bios_print_nibble

mov al, ' '
int 0x10

jmp .print_hex_ret


.bios_print_nibble:
cmp al, 9                 
ja .print_hex_letter
add al, 0x30             
int 0x10
ret

.print_hex_letter:
add al, 0x57            
int 0x10
ret