[src/trunk]: src/sbin/fdisk/mbr - Use the proper multiply instructions so tha...

[christos <christos%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/8154a5a9f39f
branches:  trunk
changeset: 472490:8154a5a9f39f
user:      christos <christos%NetBSD.org@localhost>
date:      Fri Apr 30 15:29:44 1999 +0000

description:
- Use the proper multiply instructions so that we don't get truncated.
- Fix comparison, which did not work before.

diffstat:

 sbin/fdisk/mbr/mbr.S |  20 +++++++++++++-------
 1 files changed, 13 insertions(+), 7 deletions(-)

diffs (43 lines):

diff -r c4682e5f368b -r 8154a5a9f39f sbin/fdisk/mbr/mbr.S
--- a/sbin/fdisk/mbr/mbr.S      Fri Apr 30 15:29:24 1999 +0000
+++ b/sbin/fdisk/mbr/mbr.S      Fri Apr 30 15:29:44 1999 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: mbr.S,v 1.4 1999/04/28 23:27:02 fvdl Exp $     */
+/*     $NetBSD: mbr.S,v 1.5 1999/04/30 15:29:44 christos Exp $ */
 
 /*
  * Copyright (C) 1998 Wolfgang Solfrank.
@@ -145,6 +145,10 @@
  */
 boot:
        movb_ireg0_reg(SI_INDEX,DL)
+       data32
+       xorl    %ecx,%ecx
+       data32
+       xorl    %eax,%eax
        movb    $8,%ah
        int     $0x13
 
@@ -161,14 +165,16 @@
        orl     %ebx,%ecx
        incl    %ecx                    /* cx has #cylinders */
 
-       mul     %edx                    /* h * s (will fit in 16 bits) */
-       mul     %ecx                    /* dx:ax = c * h * s */
+       mull    %edx                    /* h * s (will fit in 16 bits) */
+       data32
+       mull    %ecx                    /* %eax = c * h * s */
 
-       cmpw_reg_iregoff(DX,SI_INDEX,10)
        movb_ireg0_reg(SI_INDEX,DL)
-       jl      noext
-       jne     tryext
-       cmpw_reg_iregoff(AX,SI_INDEX,8)
+       data32
+       addr32
+       movl    8(%esi), %ebx
+       data32
+       cmpl    %eax, %ebx
        jl      noext                   /* total # chs sectors > part. start */
 
 tryext: