--- /dev/null
+; This code is adapted from Kernel Toolkit 0.2
+; and Linux version 2.2.x, so the following copyrights apply:
+
+; Copyright (C) 1991, 1992 Linus Torvalds
+; modified by Drew Eckhardt
+; modified by Bruce Evans (bde)
+; adapted for Kernel Toolkit by Luigi Sgro
+
+%ifndef UTIL_ASM
+%define UTIL_ASM
+%include "defs.asm"
+%include "symbol.asm"
+
+[BITS 16]
+
+; The following were copied from ktk-0.2 bootsect.asm, and were presumably
+; from the Linux bootsect code. I changed them a little so they
+; don't clobber the caller's registers.
+
+EXPORT PrintHex
+
+[SECTION .text]
+; Print the word contained in the dx register to the screen.
+align 8
+PrintHex:
+ pusha
+ mov cx, 4 ; 4 hex digits
+.PrintDigit:
+ rol dx, 4 ; rotate so that lowest 4 bits are used
+ mov ax, 0E0Fh ; ah = request, al = mask for nybble
+ and al, dl
+ add al, 90h ; convert al to ascii hex (four instructions)
+ daa ; I've spent 1 hour to understand how it works..
+ adc al, 40h
+ daa
+ int 10h
+ loop .PrintDigit
+ popa
+ ret
+
+; Print a newline.
+align 8
+PrintNL: ; print CR and NL
+ push ax
+ mov ax, 0E0Dh ; CR
+ int 10h
+ mov al, 0Ah ; LF
+ int 10h
+ pop ax
+ ret
+
+
+%endif
