; important functions in this file: kprintf

; write a character to kernel output
; in: al
printc:
  push ax
  push bx
  mov bx, 0x0000
  mov ah, 0x0e
  int 0x10
  pop bx
  pop ax
  ret

; prints a nibble in hex
; in: al
print4:
  and al, 0x0F
  add al, 0x30
  cmp al, 0x3a
  jl printc
  add al, 0x07
  jmp printc

; print a byte
; in: al
print8:
  push ax ; avoid destroying ah
  aam 16 ; high nibble moved into ah
  xchg ah,al ; high nibble first
  call print4
  xchg ah,al
  call print4
  pop ax
  ret

; print a word
; in: ax
print16:
  xchg ah,al
  call print8
  xchg ah,al
  call print8
  ret

; print a inline following its call opcode
; the string ends with a nullbyte
; trashes si
print_inline:
  pop si
  push ax
  push bx
  mov bx, 0x0000
.loop:
  lodsb
  cmp al, 0x00
  je .end
  mov ah, 0x0e
  int 0x10
  cmp al, 0x0D
  jmp .loop
.end:
  pop bx
  pop ax
  push si
  ret