ljmp syntax question
H. J. Lu
hjl@lucon.org
Wed Mar 21 20:34:00 GMT 2007
On Wed, Mar 21, 2007 at 01:18:09PM -0700, Smith, Stephen (SWCOE) wrote:
> I am writing a BIOS and my code is at $0xF000:$0000 (real mode x86) .
>
> I set up my GDT and switch into protected mode and now do the following:
>
> /* PROT_MODE_CSEG = 0x8, protcseg=0xFFFF0028 */
> ljmp $PROT_MODE_CSEG, $protcseg
> .code32
> protcseg:
> movw $PROT_MODE_DSEG, %ax
>
> When I reach protcseg, CS=0x8, and eip=0x28 which is off by about
> 0xFFFF0000. How should I have coded the long jump?
Are you running into this
http://sources.redhat.com/bugzilla/show_bug.cgi?id=3958
H.J.
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